DESCRIPTION [0001]. Field of the invention

[0002]. The present invention relates to a frame assembly for a bicycle, and also to a frame and motor assembly, and also to a bicycle.

[0003]. Background art

[0004]. Generally, a bicycle comprises a frame comprising a head tube, a middle tube configured to connect a bottom bracket to the head tube, and a seatpost tube configured to connect a seat to the frame.

[0005]. To increase the driving comfort on off-road trails, bicycles provided with a rear damping system configured to elastically absorb the ruggedness of the ground transmitted to the frame, are known.

[0006]. A known damping system comprises a chain stay configured to be connected to a rear wheel, rotatably connected to the frame in at least one chain stay fulcrum and elastically connectable to the frame, for example by means of a damper and a linkage, so that the chain stay is configured to elastically oscillate about the chain stay fulcrum.

[0007]. Although the frame assemblies of the known type comprising a frame and a rear damping system meet the need to cushion the frame, they result in overall increased weight of the bicycle and also in increased overall dimensions in the area of the bicycle between the frame and the rear wheel.

[0008]. Further, the frame assemblies of the known type generally are pivoted to the frame, thus generating different responses to the ruggedness of the ground according to where the cyclist's weight is displaced, thus requiring significant preparation and significant experience of the cyclist in order to adapt him/herself to the damping changes.

[0009]. Further, certain frame assemblies of the known type raise the center of mass of the frame assembly, affecting the driving stability.

[0010]. Within this scope, the need is felt in the field to devise frame assemblies which are capable of absorbing the ruggedness of the ground with at least equal, if not superior, efficiency to what is known while affecting the driving comfort, and also the braking comfort and stability, as little as possible.

[0011]. Further, the need is strongly felt in the field to provide frame assemblies which are as compact as possible, while maintaining increased damping performance which is as balanced as possible with respect to the length of the bicycle.

[0012]. Further, the need is strongly felt in the field to reduce the weight of the bicycles and also to minimize the components of the frame of a bicycle.

[0013]. Therefore, the problem underlying the present invention is to devise a frame assembly, and also a frame and motor assembly, and also a bicycle, which have structural and functional features such as to satisfy the aforementioned needs and, at the same time, solve the drawbacks mentioned with reference to the prior art and satisfy the aforesaid felt needs.

[0014]. Solution

[0015]. The aim of the present invention is to provide a frame assembly, a frame and motor assembly and a bicycle.

[0016]. These and other objects and advantages are achieved with a frame assembly according to claim 1, and also a frame and motor assembly according to claim 10, and also a bicycle according to claim 14.

[0017]. Some advantageous embodiments are the object of the dependent claims.

[0018]. According to an aspect, there is provided a frame assembly comprising a frame and a damping system rotatably connected to said frame to cushion said frame. Said frame comprises an oblique tube, a head tube and a seatpost tube. Said oblique tube comprises a bottom bracket portion configured to be connected to a bottom bracket shell. Said oblique tube predominantly extends along an oblique tube longitudinal direction L-L between said bottom bracket portion and said head tube. Said oblique tube longitudinal direction L-L is inclined with respect to a horizontal direction X-X. Said head tube is configured to be connected to a front fork. According to an embodiment, said front fork comprises a front wheel coupling configured to connect said front fork to a front wheel. Said head tube has a head tube centerline axis a-a. Said seatpost tube comprises a seatpost shell configured to be connected to a seat tube of a seat of the bicycle. Said seatpost shell has a seatpost shell centerline axis b-b. Said seatpost shell centerline axis b-b forms a seatpost shell angle with said horizontal direction X-X between 60° and 80°. Said rear damping system comprises a chain stay rotatably connected to said oblique tube to cushion said frame. Said chain stay comprises a rear wheel coupling configured to connect said chain stay to a rear wheel. Said rear wheel coupling defines a rear wheel coupling axis c-c which is perpendicular to an assembly plane. Said bottom bracket shell has a bottom bracket centerline axis e-e which is perpendicular to said assembly plane. Said chain stay is rotatably connected to said oblique tube about a chain stay fulcrum axis, in which said chain stay fulcrum axis is perpendicular to said assembly plane and/or parallel to said rear wheel coupling axis c-c. Said frame assembly defines an intersecting point C between an extension of said head tube centerline axis a-a and a direction which is parallel to said horizontal direction X-X passing through said rear wheel coupling axis c-c. Said frame assembly defines a front wheel coupling axis d-d which is parallel to said rear wheel coupling axis c-c, thus moving away from said intersecting point C along a direction which is perpendicular to said extension of head tube centerline axis a-a and belonging to said assembly plane, in opposite direction with respect to said rear wheel coupling, by a front wheel coupling distance A having a length between 2 cm and 6 cm. Said frame assembly defines a wheelbase distance D which is equal to the distance between said rear wheel coupling axis c-c and said front wheel coupling axis d-d. Said chain stay fulcrum axis is arranged along a direction which is parallel to said horizontal direction X-X at a horizontal fulcrum distance X from a middle point of said wheelbase distance D. Said chain stay fulcrum axis is arranged along a direction which is parallel to a vertical direction Y-Y which is perpendicular to said horizontal direction X-X and perpendicular to said bottom bracket centerline axis e-e at a vertical distance Y from said bottom bracket centerline axis e-e. Said horizontal distance X is between -9.0 cm and +5.0 cm towards said rear wheel coupling axis c-c and said front wheel coupling axis d-d, respectively. Said vertical distance Y is between 5.0 cm and 10.0 cm .

[0019]. By virtue of the proposed solutions, a highly balanced frame which is cushioned at the back may be ensured.

[0020]. By virtue of the proposed solutions, a frame assembly in which the fulcrum of the chain stay is vertically substantially aligned with the maximum dimension of the crankset gear can be provided so that a rotation of the chain stay affects the chain connected to the crankset gear as little as possible. Synergistically, by virtue of the positioning of the fulcrum horizontally about the middle point of the wheelbase distance, the fulcrum moves towards the front wheel coupling axis with respect to what is known, thus causing on one hand, a given lengthening of the chain under pedaling and damping conditions which stiffen the damping system, and on the other, allowing a large chain stay lever to be obtained, that is an increased distance between the rear wheel coupling and the fulcrum, which allows reaching a synergetic and optimal damping solution. By virtue of the proposed solutions, the ruggedness of the ground may therefore be cushioned despite the elongated chain.

[0021]. By virtue of the proposed solutions, the stiffening of the damping system due to the chain pulling action and responsible for the so-called pedal kickback is counterbalanced by the greater length of the chain stay lever which allows the frame to be cushioned with great efficiency also with the elongated chain.

[0022]. By virtue of the proposed solutions, the distance between a rear wheel coupling of a chain stay and a bottom bracket may be decreased, in which the chain stay is rotatably pivoted to the frame about a fulcrum axis, and at the same time, the damping efficiency may be maintained, if not increased, thus increasing the distance between the fulcrum axis and a rear wheel coupling axis defined by the rear wheel coupling, thus obtaining a frame assembly capable of absorbing impacts and ground ruggedness in an improved manner with respect to what is known.

[0023]. By virtue of the proposed solutions, a compact, highly stable frame assembly may be provided by lowering the center of mass of the bicycle.

[0024]. According to a further aspect, a frame and motor assembly for an electric bicycle is provided. Said frame and motor assembly comprises a frame assembly and an electric motor. Said frame assembly comprises a frame and a rear damping system. Said frame comprises a bottom bracket portion configured to be connected to the electric motor. The bottom bracket portion is directly or indirectly connected to a bottom bracket shell configured to receive a bottom bracket. Said rear damping system comprises a chain stay elastically and rotatably connected to said frame about a chain stay fulcrum axis to cushion said frame. Said electric motor is configured to motorize said bottom bracket and is connected to said frame. Said frame and motor assembly comprises at least one connecting element which connects both said damping system and said electric motor to said frame, in which said at least one connecting element predominantly extends parallel to said chain stay fulcrum axis.

[0025]. By virtue of the proposed solutions, a compact frame and motor assembly may be ensured.

[0026]. By virtue of the proposed solutions, a frame and motor assembly having a reduced weight with respect to what is known may be provided.

[0027]. By virtue of the proposed solutions, a frame and motor assembly with reduced components with respect to what is known may be provided.

[0028]. By virtue of the proposed solutions, the coupling between motor and frame, and damping system and frame, is highly secure and long-lasting and also allows the manufacturing times of the frame assembly to be reduced and simplifies the assembly and maintenance steps.

[0029]. According to another aspect, a frame assembly for an electric bicycle is provided.

[0030]. Said frame assembly comprises a frame and a rear damping system for cushioning said frame. Said frame comprises an oblique tube, a head tube and a seatpost tube. Said oblique tube comprises a bottom bracket portion configured to be directly or indirectly connected to a bottom bracket shell configured to receive a bottom bracket. Said oblique tube extends along an oblique tube longitudinal direction L-L between said bottom bracket portion and said head tube, in which said oblique tube longitudinal direction L- L is inclined with respect to a horizontal direction X-X. Said rear damping system comprises a chain stay rotatably connected to said oblique tube to cushion said frame, in which said chain stay is connected to said frame exclusively at said oblique tube.

[0031]. Said oblique tube internally comprises a battery seat for accommodating a battery. Said battery is configured to power an electric motor which is configured to be connected to said oblique tube at least at said bottom bracket portion. Said seatpost tube is exclusively connected to said oblique tube in an intermediate zone between said head tube and said bottom bracket portion. Said oblique tube is self-supporting. Said oblique tube is the only portion or component of said frame configured to support said electric motor 36 and said battery 35 and to unload the weight of a user of said electric bicycle onto a front wheel connected to said head tube 5 and onto a rear wheel connected to said chain stay 9.

[0032]. By virtue of the proposed solutions, a highly compact frame assembly for an electric bicycle may be provided.

[0033]. By virtue of the proposed solutions, a frame assembly for an electric bicycle with a reduced number of components while maintaining an increased structural resistance, may be provided.

[0034]. By virtue of the proposed solutions, a frame assembly for an electric bicycle with a reduced weight may be provided.

[0035]. As known, electric bicycles take on, in the structure, that is in the frame, the shapes and components of the frame of a muscle bicycle, which have only been resized in the section related to the oblique tube and the motor coupling was inserted in the bottom bracket zone. Contrarily, the aim of the present invention is the definition of a new bearing frame structure having optimal shape for electric bicycles, which is defined with single Y-beam structure.

[0036]. Drawings

[0037]. Further features and advantages of the frame assembly, and also the frame and motor assembly, and also the bicycle, will be apparent from the following description of preferred and nonlimiting embodiments thereof, with reference to the accompanying drawings, in which:

[0038]. - Figure 1 shows an axonometric view of a frame assembly according to the present invention, in which a frame and a damping system comprising a chain stay are shown;

[0039]. - Figures 2 and 3 show a side view perpendicular to a frame assembly plane, the frame assembly in Figure 1 in which the fulcrum axis of the chain stay is shown in two different positions, vertically with respect to the middle of the bottom bracket shell, and horizontally with respect to the middle point of the wheelbase distance; [0040]. - Figure 4 shows a detail of Figure 3, in which the damping system of the frame assembly comprising a linkage and a damper connecting the chain stay to the frame, is shown;

[0041]. - Figure 5 shows an axonometric bottom view of a detail of the frame assembly in Figure 1, in which the chain stay is shown having two chain stay arms connected by a middle connecting bridge, and in which there are shown a first pair of first levers and a second pair of second levers which connect the front fork, an end of the damper and the bottom bracket portion of the frame;

[0042]. - Figure 6 shows a side view of a bicycle according to the present invention, comprising a frame assembly according to the present invention;

[0043]. - Figure 7 shows a side view of a frame assembly according to the present invention, for an electric bicycle which is connectable to an electric motor comprising, integrated, a bottom bracket shell and drive means, and also a bottom bracket configured to be connected to a pair of pedals;

[0044]. - Figure 8 shows a side view of a frame and motor assembly according to the present invention, comprising the frame assembly in Figure 7, and an electric motor connected to said bottom bracket portion of frame;

[0045]. - Figure 9 shows a side view of a frame and motor assembly according to the present invention, comprising the frame assembly in Figure 2 or 3, and an electric motor having a bottom bracket part adapted to be inserted into a bottom bracket shell of the frame and a motor part which internally supports drive means; [0046]. - Figure 10 shows an electric bicycle according to the present invention;

[0047]. - Figure 11 shows a perspective view of the frame assembly in which the battery housing in the oblique tube of the frame is shown;

[0048]. - Figure 12 shows a side view of the frame assembly according to the present invention, in which an arm of the chain stay was omitted to show the seats connecting the first lever of the linkage and the chain stay to the frame, in which at least one of such seats is configured to also restrain an electric motor;

[0049]. - Figure 13 shows a front view, orthogonal to the chain stay fulcrum axis, of a front fork of said frame assembly;

[0050]. - Figure 14 shows a side view of a frame assembly according to the present invention, configured to be connected to an electric motor;

[0051]. - Figures 15 and 16 show an axonometric view of connecting elements configured to simultaneously connect the rear damping system, that is, the chain stay and/or a lever of the linkage, and the electric motor to the frame; the depicted connecting elements show a pin body having an internally or externally threaded portion and a pin screw or a pin nut configured to fasten the connecting element to the frame, and also the chain stay or a lever of the linkage, and the electric motor;

[0052]. - Figure 17 shows an axonometric view of two bearings which can be fitted on the pin body or rod of the connecting element to allow a rotatable connection of the chain stay and/or of the linkage to the frame;

[0053]. - Figure 18 shows an axonometric view of a connecting element predominantly extending parallel to the chain stay fulcrum axis and configured to simultaneously connect the rear damping system, that is, the chain stay and/or a lever of the linkage, and the electric motor to the frame; in which a pin body or bushing and two opposite pin screws for fastening the pin body or bushing to the frame, and two bearings for rotatably connecting the chain stay or the linkage to the frame, are shown;

[0054]. - Figure 19 shows an axonometric view of a frame and motor assembly according to the present invention, in which there is shown a frame assembly comprising a frame and a damping system connected to the frame, and an electric motor for bottom bracket connected to the frame, in which at least one connecting element, predominantly extending parallel to the chain stay fulcrum axis, simultaneously connects both said damping system and said motor to the frame.

[0055]. Description of some preferred embodiments

[0056]. According to a general embodiment, reference numeral 1 indicates a frame assembly for a bicycle 100.

[0057]. According to an embodiment, said frame assembly 1 comprises a frame 2 and a damping system 8 rotatably connected to said frame 2 to cushion said frame 2.

[0058]. According to an embodiment, said frame 2 comprises an oblique tube 3, a head tube 5 and a seatpost tube 6.

[0059]. According to an embodiment, said oblique tube 3 comprises a bottom bracket portion 18 configured to be connected to a bottom bracket shell 4. According to an embodiment, said bottom bracket portion 18 is directly or indirectly connected to a bottom bracket shell 4 configured to receive a bottom bracket 66.

[0060]. According to an embodiment, said oblique tube 3 predominantly extends along an oblique tube longitudinal direction L-L between said bottom bracket portion 18 and said head tube 5. Said oblique tube longitudinal direction L-L is inclined with respect to a horizontal direction X-X. According to an embodiment, said horizontal direction X-X belongs to a supporting surface, such as, for example, a road or a paving, on which said bicycle rests.

[0061]. According to an embodiment, said head tube 5 is configured to be connected to a front fork 10. According to an embodiment, said front fork 10 comprises a front wheel coupling 12 configured to connect said front fork 10 to a front wheel 14. According to an embodiment, said head tube 5 is substantially cylindrical in shape.

[0062]. According to an embodiment, said head tube 3 has a head tube centerline axis a-a.

[0063]. According to an embodiment, said seatpost tube 6 comprises a seatpost shell 49 configured to be connected to a seat tube 42 of a seat 43 of bicycle 100. According to an embodiment, said seatpost shell 49 is substantially cylindrical in shape.

[0064]. According to an embodiment, said seatpost shell 49 has a seatpost shell centerline axis b-b . Said seatpost shell centerline axis b-b forms a seatpost shell angle with said horizontal direction X-X between 60° and 80°. According to an embodiment, said seatpost shell angle is between 60° and 70°. According to an embodiment, said seatpost shell angle is between 63° and 65°. According to an embodiment, said seatpost shell angle is between 73° and 75°.

[0065]. According to an embodiment, said rear damping system 8 comprises a chain stay 9 rotatably connected to said oblique tube 3 to cushion said frame 2. Said chain stay 9 comprises a rear wheel coupling 11 configured to connect said chain stay 9 to a rear wheel 13. Said rear wheel coupling 11 defines a rear wheel coupling axis c-c which is perpendicular to an assembly plane. According to an embodiment, said assembly plane is defined by the plane passing through said head tube axis a-a and through said seatpost shell centerline axis b-b.

[0066]. According to an embodiment, said bottom bracket shell 4 has a bottom bracket centerline axis e-e which is perpendicular to said assembly plane.

[0067]. According to an embodiment, said chain stay 9 is rotatably connected to said oblique tube 3 about a chain stay fulcrum axis 15, in which said chain stay fulcrum axis 15 is perpendicular to said assembly plane and/or parallel to said rear wheel coupling axis c-c. According to an embodiment, said chain stay 9 can elastically oscillate between a balance position and at least one cushioned position.

[0068]. According to an embodiment, said frame assembly 1 defines an intersecting point C between an extension of said head tube centerline axis a-a and a direction which is parallel to said horizontal direction X-X and passes through said rear wheel coupling axis c-c. [0069]. According to an embodiment, said frame assembly 1 defines a front wheel coupling axis d-d which is parallel to said rear wheel coupling axis c-c, thus moving away from said intersecting point C along a direction which is perpendicular to said extension of said head tube centerline axis a-a and belonging to said assembly plane, in opposite direction with respect to said rear wheel coupling 11, by a front wheel coupling distance A having a length between 2 cm and 6 cm. According to an embodiment, said front wheel coupling distance A is between 3.5 cm and 4.5 cm. According to an embodiment, said front wheel coupling distance A is equal to about 4.0 cm or 4.4 cm. According to an embodiment, said front wheel coupling distance A is equal to the extension of a fork arm for coupling the front wheel.

[0070]. According to an embodiment, said frame assembly 1 defines a wheelbase distance D which is equal to the distance between said rear wheel coupling axis c-c and said front wheel coupling axis d-d. [0071]. Advantageously, said chain stay fulcrum axis 15 is arranged along a direction which is parallel to said horizontal direction X-X at a horizontal fulcrum distance X from a middle point of said wheelbase distance D. Said chain stay fulcrum axis 15 is arranged along a direction which is parallel to a vertical direction Y-Y which is perpendicular to said horizontal direction X-X and perpendicular to said bottom bracket centerline axis e-e at a vertical distance Y from said bottom bracket centerline axis e-e.

[0072]. Said horizontal distance X is between -9.0 cm and +5.0 cm towards said rear wheel coupling axis c-c and said front wheel coupling axis d-d, respectively.

[0073]. Said vertical distance Y is between 5.0 cm and 10.0 cm.

[0074]. By virtue of the provision of rotatably connecting the chain stay 9 to frame 2 at a horizontal distance X from the middle point of the wheelbase distance and at a vertical distance Y from the middle of the bottom bracket shell, a bicycle frame assembly may be provided which allows counter-balancing the effect of the rear damping system on the chain pulling action with an increased damping efficiency by increasing the distance between the fulcrum of the chain stay and the rear wheel coupling and by keeping the fulcrum substantially vertically aligned with the position in which the chain is taught on a crankset gear connected to the bottom bracket shell, thus ensuring increased damping performance despite a chain lengthening in the damping and pedaling step.

[0075]. By virtue of the position of the chain stay fulcrum axis within an area about the middle point of the wheelbase distance, a highly balanced frame assembly may be obtained with respect to the travelling direction of a bicycle.

[0076]. Further, by virtue of the proposed solution, the chain stay is rotatably connected to the frame in an advanced position with respect to the bottom bracket, and a damping lever arm of the chain stay may be obtained, that is the distance between the chain stay fulcrum axis and the rear wheel coupling axis, which is elevated with respect to what is known, while keeping the chain stay fulcrum axis and the rear wheel coupling axis substantially aligned and decreasing the distance between the bottom bracket of the bicycle and the rear wheel coupling axis.

[0077]. By virtue of the arrangement of the chain stay fulcrum axis according to the present invention, it is possible to have sufficient space in the bottom bracket portion of the frame to connect the kinematic mechanisms, for example a linkage, of the damping system to the frame by lowering the center of mass and providing the possibility of concentrating the weight of the frame assembly in the center of gravity thereof.

[0078]. According to an embodiment, the vertical distance Y and the horizontal distance X are defined when said chain stay 9 is in said balance position. According to an embodiment, said chain stay 9 has, between said cushioned position and said balance position, an angle of less than 15 degrees. According to an embodiment, said chain stay 9 rotates, between said cushioned position and said balance position, about said chain stay fulcrum axis 15 by an angle of less than 15 degrees. According to an embodiment, in said balance position, the damper is in a position of maximum extension thereof.

[0079]. According to an embodiment, said horizontal distance X is between -5.0 cm and +5.0 cm towards said rear wheel coupling axis c- c and said front wheel coupling axis d-d, respectively. In other words, the horizontal position of the chain stay fulcrum axis 15 is about of the middle point of the wheelbase distance D, preferably displaced towards said front wheel coupling axis d-d. According to an embodiment, said horizontal distance X is between -1.0 cm and +1.0 cm towards said rear wheel coupling axis c-c and said front wheel coupling axis d-d, respectively. In other words, the horizontal position of the chain stay fulcrum axis 15 substantially is coincident with the middle point of the wheelbase distance D. According to an embodiment, said vertical distance Y is between 6.0 cm and 8.5 cm, or between 7.0 cm and 10 cm.

[0080]. According to an embodiment, said assembly plane is a symmetry plane of said frame 3 which longitudinally divides said frame 3 in half.

[0081]. According to an embodiment, a circumference centered on said chain stay fulcrum axis 15, having radius equal to the distance between said rear wheel coupling 11 and said chain stay fulcrum axis 15, intersects said front wheel coupling axis d-d.

[0082]. According to an embodiment, said chain stay fulcrum axis 15 is located past said bottom bracket shell 4 in direction of said front wheel coupling axis d-d.

[0083]. According to an embodiment, said chain stay 9 is pivoted to said frame 2 exclusively at said oblique tube and is exclusively rotatable about said chain stay fulcrum axis 15.

[0084]. According to an embodiment, in a side view perpendicular to said assembly plane, said fork fulcrum axis 15 is located past said oblique tube longitudinal direction L-L in direction of said front wheel coupling axis d-d.

[0085]. According to an embodiment, said fork fulcrum axis 15 is located past an oblique direction B-B belonging to said assembly plane in direction of said front wheel coupling axis d-d. Said oblique direction intersects said bottom bracket portion 18 and said head tube 5. According to an embodiment, said oblique direction intersects, or passes through, a lower opening of said head tube 5. According to an embodiment, said oblique direction intersects a rear end of said bottom bracket portion 18, in which said rear end is facing said rear wheel coupling axis. According to an embodiment, said oblique direction B-B intersects a bottom bracket shell 4, preferably passing through the central axis thereof, connected to said frame 2.

[0086]. According to an embodiment, said frame assembly 1 comprises a front fork 10 rotatably connected to said head tube 5. Said front fork 10 comprises a front wheel coupling 12 which defines said front wheel coupling axis d-d perpendicular to said assembly plane. Said wheelbase distance D is the distance between said front wheel coupling axis d-d and said coupling of rear wheel coupling c- c.

[0087]. According to an embodiment, said frame assembly 1 comprises at least one crankset gear 73 connected to said bottom bracket shell . Said at least one crankset gear has a maximum crankset gear diameter DI between 10.0 cm and 20.0 cm. Said vertical distance Y is equal to about half of said maximum crankset gear diameter DI so that said chain stay fulcrum axis 15 substantially is aligned with a pulling position of a chain mounted on said crankset gear. According to an embodiment, said crankset gear 73 has a diameter between 15.0 cm and 17.0 cm.

[0088]. According to an embodiment, said rear damping system 8 comprises a damper 26. According to an embodiment, said damper is directly or indirectly connected to said frame 2 and to said chain stay 9.

[0089]. According to an embodiment, said rear damping system 8 comprises a linkage 27.

[0090]. According to an embodiment, said damper 26 predominantly extends along a damper direction between a first damper end 47 and a second damper end 48. According to an embodiment, said damper 26 is a gas damper of the known type. According to an embodiment, said damper 26 is a spring damper of the known type.

[0091]. According to an embodiment, said damper 26 is directly rotatably connected to said frame 2 with said first damper end 47. According to an embodiment, said frame 2 comprises at least one damper coupling rib which protrudes from the outer surface of frame 2. According to an embodiment, said at least one damper coupling rib are two ribs spaced apart and specular with respect to said assembly axis so as to arrange said first damper end 47 between the two ribs. According to an embodiment, said damper coupling rib comprises at least one damper coupling hole so as to rotatably connect said first damper end to said frame about a damper pin. According to an embodiment, said first damper end 47 is connected to said oblique tube 3 or to said seatpost tube 7.

[0092]. According to an embodiment, said second damper end 48 is directly connected to said chain stay 9 or is indirectly connected to said frame 2 and to said chain stay 9.

[0093]. According to an embodiment, said linkage 27 is configured to rotatably connect said second damper end 48 to said chain stay 9 and to said frame 2. [0094]. According to an embodiment, said linkage 27 comprises at least a first lever 28 comprising a first end 30 of first lever and a second end 31 of first lever.

[0095]. According to an embodiment, said linkage 27 comprises at least a second lever 29 comprising a first end 32 of second lever and a second end 33 of second lever.

[0096]. According to an embodiment, said first lever 28 is rotatably to said oblique tube 3, said a second end 31 of first lever defining a first lever first rotation axis Al.

[0097]. According to an embodiment, said first lever 28 is rotatably connected to said damper 26 with said first end 30 of first lever. According to an embodiment, said first lever rotation axis Al is parallel to said rear wheel coupling axis c-c. According to an embodiment, said first lever rotation axis Al is arranged past an extension of said seatpost head tube centerline axis 49 towards said rear wheel coupling 11. According to an embodiment, said first lever rotation axis Al is aligned with said chain stay fulcrum axis 15 along a direction which is parallel to said horizontal direction X-X.

[0098]. According to an embodiment, said second lever 29 is rotatably connected to said damper 26 with said first end 32 of second lever and to said chain stay 9 with said second end 33 of second lever.

[0099]. According to an embodiment, said first end 30 of first lever, said first end 32 of second lever and said first damper end 47 are rotatable about a same rotation axis. According to an embodiment, said first end 30 of first lever, said first end 32 of second lever and said first damper end 47 each have a rotation hole, in which each rotation hole is coaxial so as to be rotatably connected to one another by means of a same rotation pin.

[00100]. According to an embodiment, said first lever 28 is rotatably connected to said second lever 29 at said first end 30 of first lever and said first end 32 of second lever.

[00101]. According to an embodiment, said linkage 27 is arranged between said chain stay fulcrum axis 15 and said chain stay 9 without projecting past said chain stay 9 towards said seatpost tube 6.

[00102]. According to an embodiment, said first lever 28 are two pairs of first lever connected, on opposite sides with respect to said assembly plane, to said oblique tube 3.

[00103]. According to an embodiment, said second lever 29 are two pairs of second levers, in which each second lever is connected to a respective first lever 28 and to said chain stay 9.

[00104]. According to an embodiment, said damper 26 is connected to said oblique tube 3 and to said linkage 27 so as to cushion said frame 3 substantially parallel to said oblique direction.

[00105]. According to an embodiment, said first lever, said second lever and said chain stay 9 form an articulated quadrilateral rotatably connected to said oblique tube at said chain stay fulcrum axis 15 and said first lever rotation axis Al.

[00106]. According to an embodiment (not shown), said first lever is connected with said second end of first lever to said first end of second lever, in which said second lever is connected with said second end of second lever to said chain stay and to said damper, at said second damper end, said damper being directly pivoted to said frame and to said chain stay.

[00107]. According to an embodiment, said chain stay 9 comprises a first chain stay arm 20 and a second chain stay arm 21.

[00108]. According to an embodiment, said first chain stay arm 20 and said second chain stay arm 21 are specular and symmetrical with respect to said assembly plane.

[00109]. According to an embodiment, said rear wheel coupling 11 comprises a respective rear wheel coupling hole or fork 52, 53.

[00110]. Said first chain stay arm 20 and said second chain stay arm 21 predominantly extend in respective parallel arm planes between a respective fulcrum hole 50, 51 and a respective rear wheel coupling hole or fork 52, 53.

[00111]. The respective fulcrum holes 50, 51 are coaxial to said chain stay fulcrum axis 15, and the respective rear wheel coupling holes or forks 52, 53 are coaxial to said rear wheel coupling axis c-c.

[00112]. According to an embodiment, said chain stay 9 comprises a chain stay bridge 22 which connects said first chain stay arm 20 and said second chain stay arm 21. According to an embodiment, said chain stay bridge 22 substantially is orthogonal to said assembly plane. According to an embodiment, said chain stay bridge 22 is arranged between said rear wheel coupling axis c-c and said chain stay fulcrum axis 15. [00113]. According to an embodiment, said chain stay 9 extends along a chain stay longitudinal direction F-F, thus forming a C shape in a view which is perpendicular to said assembly plane.

[00114]. According to an embodiment, said chain stay 9, or each of said chain stay arms 20, 21, comprises a first chain stay stretch 23, a second chain stay stretch 24 and a third chain stay stretch 25.

[00115]. According to an embodiment, said first chain stay stretch 23 extends between said fulcrum axis 15 and said second chain stay stretch 24, and in which said third chain stay stretch 25 extends from said second chain stay stretch 24 to said rear wheel coupling 11.

[00116]. According to an embodiment, said first, second and third chain stay stretches 23, 24, 25 predominantly extend along a rectilinear longitudinal direction and are joined to one another by curvilinear connecting portions.

[00117]. According to an embodiment, said first chain stay stretch 23 forms a first angle with said second chain stay stretch 24 between 20 and 30 degrees, and said second chain stay 24 forms a second angle d with said third chain stay stretch 25 between 20 and 30 degrees, a concave portion in direction opposite to said seatpost tube 6 so as to arrange said second chain stay stretch 24 substantially aligned with a drive chain which connects a bottom bracket gear to a gear of a pinion connected to said rear wheel.

[00118]. According to an embodiment, said first chain stay stretch 23 is about twice as long as said third chain stay stretch 25, and in which said second chain stay stretch 24 is about twice as long as said first chain stay stretch 23.

[00119]. According to an embodiment, said second chain stay stretch 24 has a length between 30 cm and 45 cm, preferably between 30 cm and 40 cm. According to an embodiment, said first chain stay stretch 23 has a length between 10 cm and 20 cm. According to an embodiment, said third chain stay stretch 25 has a length between 4 cm and 10 cm .

[00120]. According to an embodiment, said chain stay bridge 22 connects said first chain stay arm 21 to said chain stay 22 between the respective connecting portions between the first chain stay stretch 23 and the second chain stay stretch 24.

[00121]. According to an embodiment, said chain stay 9 comprises a linkage connecting seat. According to an embodiment, said linkage connecting seat comprises a substantially cylindrical portion to which each of said at least a second lever 29 rotatably connects. According to an embodiment, said linkage connecting seat is obtained on said chain stay bridge 22.

[00122]. According to an embodiment, a connection portion between said first chain stay stretch 23 and said second chain stay stretch is substantially horizontally aligned with said bottom bracket shell 4 in a vertical position which is offset from said vertical distance Y by a distance between 2 cm and 5 cm along a direction which is parallel to said vertical direction Y-Y and passes through the bottom bracket shell centerline axis e-e. Thereby, the chain stay comprises horizontal sleeves, that is the chain stay arms 21, 22, thus avoiding to comprise vertical sleeves, and is arranged above a drive chain of the bicycle.

[00123]. According to an embodiment, said oblique tube 3 extends along said oblique tube longitudinal direction L-L, thus forming an S shape in a view which is perpendicular to said assembly plane.

[00124]. According to an embodiment, said oblique tube 3 extends along at least a first oblique tube stretch 16 and a second oblique tube stretch 17, in which said second oblique tube stretch 17 is connected to said head tube 5 at said first oblique tube stretch 16, and in which said first oblique tube stretch 16 is connected to said bottom bracket portion 18.

[00125]. According to an embodiment, said bottom bracket portion 18 comprises a third oblique tube stretch which is directly or indirectly connected to said bottom bracket shell 4 and to said first oblique tube stretch 16.

[00126]. According to an embodiment, each of said oblique tube stretches 16, 17, 18 extends along rectilinear directions, preferably joined to one another by connecting portions which extend along predominantly curvilinear directions.

[00127]. According to an embodiment, said first oblique tube stretch 16 forms an angle with said second oblique tube stretch 17 between 140 degrees and 160 degrees.

[00128]. According to an embodiment, said first oblique tube stretch 16 forms an angle with said third oblique tube stretch or with said bottom bracket portion 18 between 140 degrees and 160 degrees. [00129]. According to an embodiment, said chain stay 9 is pivoted to said first oblique tube stretch 16 or to said bottom bracket portion 18.

[00130]. According to an embodiment, said chain stay 9 is pivoted at a connecting portion of said bottom bracket portion 18 and said oblique tube first portion 16.

[00131]. According to an embodiment, said seatpost tube 6 comprises a horizontal tube 7, in which said horizontal tube 7 connects said seatpost shell 49 to said oblique tube 3, in which said horizontal tube 7 is inclined with respect to said seatpost shell centerline axis b-b by an angle between 110 degrees and 150 degrees.

[00132]. According to an embodiment, said seatpost tube 6 is exclusively connected to said oblique tube 3 in an intermediate zone between said head tube 5 and said bottom bracket portion 18.

[00133]. According to an embodiment, said horizontal tube 7 is connected to said oblique tube 3 at a connecting portion between said oblique tube first portion 16 and said oblique tube second portion 17.

[00134]. According to an embodiment, said horizontal tube 7 has a substantially rectilinear extension, in which said horizontal tube 7 forms an angle with said second oblique tube stretch 17 between 130 and 150 degrees, and in which said horizontal tube 7 forms an angle with said first oblique tube stretch 16 between 55 and 75 degrees so as to arrange said horizontal tube 7 substantially parallel to said horizontal direction X-X.

[00135]. According to an embodiment, said horizontal tube 7 is the only connecting tube between said seatpost shell 49 and said oblique tube 3, thus avoiding to connect said seatpost tube 6 to said bottom bracket tube 4 or to said chain stay 9 or to said bottom bracket portion 18.

[00136]. According to an embodiment, said frame 3 is Y-shaped.

[00137]. According to an embodiment, said oblique tube 3 and said horizontal tube 7 form a Y.

[00138]. According to an embodiment, said oblique tube 3 internally comprises a battery seat 37 for accommodating a battery 35, in which said battery is configured to supply an electric motor 36 which is connectable to said frame 2.

[00139]. Non-cushioned bicycles comprise a chain stay configured to be connected to a rear wheel and rigidly connected to the steering column and/or the bottom bracket. The chain stay may be provided so as to form a triangle with the steering column, and usually comprises horizontal sleeves which connect the rear wheel to the frame in direction of the seat coupling zone. The frames of the known type are configured to support and discharge a user's weight, at least by means of the steering column and the middle tube. To increase the traveling comfort, the frame is connected to a rear damping system configured to elastically absorb the ruggedness of the ground transmitted to the frame. The damping system comprises the chain stay elastically and rotatably connected to the frame in at least one fulcrum point. In certain solutions, the motor is integrated in one of the two wheels of the bicycle, and therefore does not push on the frame with the weight thereof. In other solutions, the motor is restrained to the frame in a connection area between the middle tube and the steering column so as to motorize the bottom bracket of the bicycle. In certain solutions of this type, the bottom bracket is integrated within the motor itself. The motor is supplied by a battery which is supported by the bicycle frame and which is connectable to a battery seat. Certain known solutions of electric bicycle frames provided with a bottom bracket motor provide obtaining the battery seat in the steering column or in the middle tube. In these solutions, in addition to comprising the tube of the frame in which the battery seat is obtained, the frame comprises a further tube, that is the steering column or the middle tube, to support the weight of a user of the bicycle and unload it onto the rear and front wheel. Further, in such solutions, the chain stay comprises both horizontal sleeves and oblique sleeves connected to the frame to discharge a user's weight towards the rear wheel in several directions. Although they allow functional frame assemblies for electric bicycles to be provided, these solutions increase the overall weight of the frame. Within the scope of electric bicycles, one of the most felt needs in the field is the one of decreasing the overall weight of the bicycle while maintaining sufficient sturdiness of the frame. A further felt need in the field is the one of decreasing the number of components of the frames for electric bicycles so as to simplify the production steps, as well as simplify maintenance, and also reduce the production costs. Within the scope of electric bicycles provided with a damping system, the need is strongly felt to provide compact frames, with a smaller number of components with respect to what is known, without decreasing the sturdiness thereof, so as to reduce the weight of the bicycle, reduce the production costs and facilitate maintenance operations.

[00140]. According to an embodiment, said oblique tube 3 is self- supporting, and in which said oblique tube 3 is the only portion of said frame 2 configured to support said electric motor 36 and said battery 35 and to unload the weight of a user of said bicycle.

[00141]. According to an embodiment, said frame 2 is self- supporting.

[00142]. According to an embodiment, said frame 2 is a single-piece frame exclusively comprising said oblique tube 3, said seatpost tube 6, said head tube 5, thus avoiding to comprise a connecting tube column between said seatpost tube 6 and said bottom bracket portion 18.

[00143]. According to an embodiment, said frame 2 and/or said chain stay 9 is made of composite material, preferably comprising carbon fibers, or is made of aluminum.

[00144]. Usually, electric bicycles comprise an electric motor connected to the frame so as to motorize the bottom bracket to which the pedals are connected. Usually, the electric motor is connected to the frame by means of threaded connecting elements, such as, for example, screws, bushings, bolts and nuts. If they are directly connected to the frame, the connecting elements are fastened in through seats made on the frame which cross a thickness of the frame, or they completely cross the frame on opposite sides. Although the connections between electric motor and frame of the known type are satisfactory from a functional viewpoint, the provision of specific seats in the frame for connecting the motor produces weakened areas of the frame which may generate breaks. In this scope, the need is felt in the field to provide frame and motor assemblies which are as compact as possible, which have a reduced number of components, while keeping unaltered, if not improving, the sturdiness of the frame and a secure connection between electric motor and frame. Further, the need is felt in the field to simplify the production steps of a frame and motor assembly for electric bicycles so as to reduce the production costs while keeping unaltered, if not improving, the structural features. Further, the need is strongly felt in the field to reduce the weight of the bicycles.

[00145]. The present invention also relates to a frame and motor assembly 101 for a bicycle 100, in which said bicycle is an electric bicycle.

[00146]. Said frame and motor assembly 101 comprises a frame assembly according to any one of the embodiments described above.

[00147]. Said frame and motor assembly 101 comprises an electric motor 36 for motorizing a bottom bracket adapted to be connected to a pair of crankarms and at least one gear.

[00148]. Said electric motor 36 is configured to be connected to said frame 2.

[00149]. According to an embodiment, said frame and motor assembly 101 comprises at least one connecting element 57, 58 which connects both said damping system 8 and said electric motor 36 to said frame 2, in which said at least one connecting element 57, 58 predominantly extends parallel to said chain stay fulcrum axis 15.

[00150]. By virtue of the proposed solution, a connection may be provided between the damping system, the electric motor and the frame by means of at least one common connecting element, thus allowing a lightening of the frame and motor assembly and also a simplification of the manufacturing and assembly steps since a same seat obtained in the frame is used to connect both the rear damping system and the motor to the frame.

[00151]. According to an embodiment, said at least one connecting element 57, 58 comprises a first connecting element 57 configured to simultaneously connect said chain stay 9 and said electric motor 36 to said frame 2.

[00152]. According to an embodiment, said at least one connecting element 57, 58 comprises a second connecting element 58 configured to simultaneously connect said linkage 27 and said electric motor 36 to said frame 2.

[00153]. According to an embodiment, said electric motor 36 is connected to said frame 2 also by means of further connecting elements, that is screws or bolts and nuts or other connecting elements of the known type for connecting the electric motor 36 to frame 2 of an electric bicycle 100.

[00154]. Thereby, a simplified frame and motor assembly may be provided since it is avoided to provide two separate seats for the connection of the motor and the damping system to the frame, and which also, for this reason, is sturdier because the zones of the frame are reduced, such as, for example, holes of seats which may weaken the structure. Further, by virtue of the proposed solution, a lighter frame and motor assembly may be provided with respect to what is known since use is made of at least one less connecting element.

[00155]. According to an embodiment, said at least one connecting element 57, 58 comprises at least one threaded portion.

[00156]. According to an embodiment, in which said at least one connecting element 57, 58 comprises at least one pin body 74 ad a screw or nut 75, in which the pin body is configured to be inserted into said at least one connecting seat passing diametrically through said frame 2, and said screw is configured to tighten said pin on the frame, on the opposite side of the frame, thus fastening said chain stay 9 or said first lever 28 to frame 2.

[00157]. According to an embodiment, said at least one connecting element 57, 58 comprises at least one bearing 76, 77 to allow a rotatable connection between said chain stay 9 or said first lever and said frame 2. According to an embodiment 76, said at least one connecting element comprises a pair of bearings 76, 77 configured to allow a rotatable connection between the two chain stay arms, or sleeves, and the frame, or between two first levers of a pair of first levers of linkage 26.

[00158]. According to an embodiment, said frame 2 comprises at least one motor coupling seat 59, 60 for connecting said electric motor 36 to said frame 2, at least one connecting seat 55, 56 for rotatably connecting said damping system 8 to said frame 2, and in which said electric motor 36 comprises at least one motor catching seat 61, 62 for connecting said electric motor 36 to said frame 2. According to an embodiment, each motor coupling seat 59, 60 predominantly extends about a respective seat axis which is parallel to the chain stay fulcrum axis 15. According to an embodiment, each connecting seat 55, 56 predominantly extends about a respective seat axis which is parallel to the chain stay fulcrum axis 15. According to an embodiment, each motor catching seat 61, 62 predominantly extends about a respective seat axis which is parallel to the chain stay fulcrum axis 15. According to an embodiment, each connecting seat 55, 56 is an annular seat. According to an embodiment, each motor catching seat 61, 62 is an annular seat. According to an embodiment, each motor coupling seat 59, 60 is an annular seat.

[00159]. According to an embodiment, said at least one motor coupling seat 59, 60 coincides with said at least one connecting seat 55, 56, and said at least one motor catching seat 61, 62 is coaxial to said at least one motor coupling seat 59, 60 so that said at least one connecting element 57, 58 connects both said damping system 8 and said electric motor 36 to said frame 2.

[00160]. According to an embodiment, said at least one connecting seat 55, 56 comprises a first connecting seat 55 for connecting said chain stay 9 to said frame 2, in which said at least one motor coupling seat 59, 60 coincides with the first connecting seat 55, and in which said at least one motor catching seat 61, 62 is coaxial to said at least one motor coupling seat 59, 60 so that said at least one connecting element 57, 58 connects both said chain stay 8 and said electric motor 36 to said frame 2.

[00161]. According to an embodiment, said at least one connecting seat 55, 56 comprises a first connecting seat 55 for connecting said chain stay 9 to said frame 2, and a second connecting seat 56 for connecting said linkage 27 to said frame 2, in which said at least one motor coupling seat 59, 60 coincides with at least one of said first connecting seat 55 and said second connecting seat 56, in which said at least one catching seat 61, 62 is coaxial to said at least one motor coupling seat 59, 60 so that said at least one connecting element 57, 58 connects both said electric motor 36 and said chain stay 9, or both said electric motor 36 and said linkage 27, to said frame 2.

[00162]. According to an embodiment, said at least one motor coupling seat 59, 60 comprises at least a first motor coupling seat 59 and at least a second motor coupling seat 60.

[00163]. According to an embodiment, said at least one motor catching seat 61, 62 comprises a first motor catching seat 61 and a second motor catching seat 62.

[00164]. According to an embodiment, said at least one connecting element 57, 58 comprises a first catching pin 57 configured to simultaneously connect said electric motor 36 and said front fork 9 to said frame 2.

[00165]. According to an embodiment, said at least one connecting element 57, 58 comprises a second catching pin 58 configured to simultaneously connect said electric motor 36 and a first lever 28 of said linkage 27 to said frame 2.

[00166]. According to an embodiment, said first motor coupling seat 59 coincides with said first connecting seat 55, in which said first catching seat 61 is coaxial to said first motor coupling seat 59 so that said electric motor 36 and said chain stay 9 are connected to said oblique tube 3 with said first catching pin 57.

[00167]. According to an embodiment, said second motor coupling seat 60 coincides with said second connecting seat 56, in which said second catching seat 62 is coaxial to said second motor coupling seat 60 so that said electric motor 36 and said linkage 27 are connected to said oblique tube 3 with said second catching pin 58.

[00168]. According to an embodiment, at least one motor catching seat 61, 62 is interposed between said frame 2 and said chain stay 56 or said linkage 27 along a direction which is parallel to said chain stay fulcrum axis 15.

[00169]. According to an embodiment, said at least one connecting seat 55, 56 is a through hole through a frame thickness of said frame 2 which extends perpendicularly both to said horizontal direction and to said vertical direction, that is parallel to said chain stay fulcrum axis 15. According to an embodiment, said at least one connecting seat 55, 56 is a seat passing through frame 2, or a component thereof, from diametrically opposite sides with respect to the assembly plane.

[00170]. According to an embodiment, said at least one motor catching seat 61, 62 is a through hole through a thickness of at least one motor catching portion 63, 64. [00171]. According to an embodiment, said first catching seat 61 and said first motor coupling seat 59 are coaxial to the chain stay fulcrum axis 15, and in which said rear front fork 9 is rotatable about said first catching pin 57.

[00172]. According to an embodiment, said first catching pin 57 passes through at least one, preferably both, said respective fulcrum holes 50, 51 of said chain stay 9.

[00173]. According to an embodiment, said second catching seat 62 and said second motor coupling seat 60 are coaxial to a first lever rotation axis Al, and in which said first lever 28 is rotatable about said second catching pin 58. According to an embodiment, said second catching pin 58 passes through a lever hole of said first lever, and preferably through both level holes of the pair of first levers.

[00174]. According to an embodiment, said electric motor 36 comprises a containment structure 65 in which there are accommodated drive means for motorizing said bottom bracket 66.

[00175]. According to an embodiment, said bottom bracket portion 18 is shaped so as to be shape coupled to at least one connection portion 67 of said electric motor 36, in which said at least one connection portion 67 comprises an upper motor portion 68 configured to be shape coupled to a lower portion of said bottom bracket portion 18.

[00176]. According to an embodiment, said bottom bracket portion 18 comprises a bottom bracket portion housing 69 shaped to accommodate said electric motor 36. [00177]. According to an embodiment, said bottom bracket portion housing 69 is a box-like structure having at least one housing opening 71 which is orthogonal to a direction which is parallel to a bottom bracket centerline axis e-e.

[00178]. According to an embodiment, at least one portion of said electric motor 36 is inserted by shape coupling into said bottom bracket portion housing 69.

[00179]. According to an embodiment, in which said bottom bracket portion housing 69 is made in one piece or is welded to an oblique tube 3 of said frame 2.

[00180]. Said electric motor comprises said bottom bracket shell 4 in which said bottom bracket 66 is fastened and in which said bottom bracket portion housing 69 comprises, in a wall opposite to said housing opening 71, a housing hole 70 which is coaxial to said bottom bracket shell 4 so as to allow a connection between a crankarm of a pedal and said electric motor 36.

[00181]. According to an embodiment, said bottom bracket portion 18 comprises, integrated, said bottom bracket shell 4, in which said motor comprises said bottom bracket 66 connected to said drive means 72 and configured to be inserted into said bottom bracket shell 4.

[00182]. According to an embodiment, said at least one motor coupling seat and said at least one connecting seat are coincident and are made on said oblique tube 3 or on said bottom bracket portion 18.

[00183]. By virtue of the provision of said at least one catching pin 57, 58 which restrains both the electric motor and the chain stay 9 to frame 2, or a first lever 28 of linkage 27 to frame 2, the number of components of the bicycle may be reduced and the weight thereof may be reduced.

[00184]. By virtue of the provision of said at least one motor coupling seat 59, 60 coincident with one of said at least a first connecting seat 55 and said at least a second connecting seat 56, the electric motor may be securely and simply fastened to frame 2, thus avoiding further motor coupling seats to be made or the number of further motor coupling seats to be reduced without decreasing the sturdiness of the frame.

[00185]. The present invention also relates to a bicycle 100 comprising a frame assembly 1 according to any one of the embodiments described above, or to a frame and motor assembly 101 according to at least any one of the embodiments described above.

LIST OF REFERENCE SIGNS

1 frame assembly

2 frame

3 oblique tube

4 bottom bracket tube

5 head tube

6 seatpost tube

7 horizontal tube

8 rear damping system

9 chain stay

10 front fork

11 rear wheel coupling

12 front wheel coupling

13 rear wheel

14 front wheel

15 chain stay fulcrum axis

16 first oblique tube stretch

17 second oblique tube stretch

18 oblique tube bottom bracket portion

20 first chain stay arm

21 second chain stay arm

22 chain stay bridge

23 first chain stay stretch

24 second chain stay stretch

25 third chain stay stretch

26 damper

27 linkage

28 first lever

29 second lever

30 first end of first lever

31 second end of first lever

32 first end of second lever

33 second end of second lever damper coupling battery- electric motor battery seat seat tube seat first front fork arm second front fork arm front fork connection portion first damper end second damper end seatpost shell first rear wheel coupling hole or fork second rear wheel coupling hole or fork battery seat opening first connecting seat second connecting seat first catching pin second catching pin first motor coupling seat second motor coupling seat first motor catching seat second motor catching seat first motor catching portion second motor catching portion motor containment structure bottom bracket motor connection portion motor upper connection portion bottom bracket portion housing housing hole housing opening drive means crankset gear 74 pin body

75 pin screw or pin nut

76 first bearing

77 second bearing

100 bicycle

101 frame and motor assembly a-a head tube centerline axis b-b seatpost shell centerline axis c-c rear wheel coupling axis d-d front wheel coupling axis A1 first lever rotation axis A2 second lever rotation axis L-L oblique tube longitudinal direction F-F chain stay longitudinal direction H-H horizontal tube longitudinal direction G-G damping direction X-X horizontal direction B-B oblique direction C intersecting point A front wheel coupling distance D wheelbase distance E wheelbase distance middle point