A VIBRATION DAMPING DEVICE

TECHNICAL FIELD

The present invention relates to a torsional damping device, in particular for a motor vehicle transmission system.

PRIOR ART

In such an application the torsional damping device can be integrated into a transmission assemblage comprising a friction clutch capable of selectively connecting the combustion engine to the gearbox, in order to filter vibrations due to irregularities of the engine.

Torque limiters comprises a transmitting plate has friction linings which rotates with the hub of the damping devices and the friction linings restrict movement of the transmitting plate by friction force among the friction linings and the cover and the pressure plate. If torque exceeds predetermined value, the friction linings slips between the cover and the pressure plate by overcoming of the said friction force and stops transmission of the torque.

A device of this kind has, in general, a torque input element, a torque output element, and elastic members mounted between the torque input element and torque output element and acting against rotation of the torque input element and torque output element with respect to one another for filtrating irregularities due to the successive combustion events in the engine's cylinders.

The damping device conventionally has springs elements whose function is to filter vibrations due to rotational irregularities of the engine, and takes effect before engine torque is transmitted to the gearbox. This allows such vibrations to be prevented from entering the gearbox and causing shocks, noise, and undesirable acoustic impacts therein.

In order to improve filtration further, it is known to use a pendulum-type damping device in addition to the usual damping device. The document FR 2981714 discloses a pendulum-type damping device having an annular support intended to be rotationally driven around its axis, and pendulum masses mounted on the outer periphery of the support. Each mass has a pendulum motion imparted to it during operation, and has two parts mounted axially on either side of the support and connected by two spacers each spanning an opening of the support. A roller is mounted between a rolling track configured in each spacer and the edge of the corresponding opening of the support.

Long travel damper type damping devices comprises several groups of elastic members, elastic members of a given group being arranged in series by means of a phasing member so that the elastic members of each group deform in phase with one another.

The document U S. Pat. No. 8,047,922 discloses a torsional damper having torque input elements and torque output elements between which are arranged several groups of elastic members arranged in series by means of a phasing member. The phase washer is arranged radially outside the web while being able to arrange the springs in series by means of a stop that becomes received between two springs mounted one after another.

There is no damping device that comprises all the solution mentioned above and it is a very complex work to combine all of them in a single damping device. As a result, all of the problems mentioned above have made it necessary to provide improvements in the related field.

OBJECT OF THE INVENTION

The present invention, aims to eliminate the problems mentioned above and to provide a technical improvements to the related field. The main aim of the invention is to provide a vibration damping device that combines plurality of function, e.g, torque limiting, vibration filtering and also easy to assemble.

The main aim of the invention is to provide a vibration damping device with pendulum damping function for better filtration. According to the invention the pendulum may be situated between damping means or after damping means.

BRIEF DESCRIPTION OF INVENTION

The present invention method above and which can be construed from the detailed description below is vibration damping device for motor vehicle. Accordingly, the present invention comprises, a first element having a hub arranged to be connected to an engine shaft to transmit a torque is provided by flywheel and an intermediate flange connected to the hub; a second element having guide washers; a first element and a second element that are rotationally movable around a rotation axis, coaxial, and capable of transmitting a torque; at least one group of damping means mounted between the first element the second element to act against the rotation of the first element and the second element respect to each other; a phasing member for arranging the damping means of that group in series so that the damping means of each group deform in phase with one another; a transmitting plate arranged to be driven around a rotation axis by the engine; two friction linings arranged to be connected both surfaces of the transmitting plate in order to enable friction force between the friction linings and surfaces which contacts the friction linings so that said friction force prevents movement of the transmitting plate relative to the said surfaces, up to predetermined torque value; a load plate applying predetermined force to transmit a torque between the friction linings; a pendulum element having a pendulum plate capable of rotational movement around the rotation axis and at least one pendulum mass able to move with respect to the pendulum plate; a connection extension said connection extension providing a connection between the pendulum plate and one of the phasing member or between the pendulum plate and one of the guide washer.

Thus, the connection of the pendulum element does not require any additional piece that does not increase the manufacturing costs or the assembly times of the vibration damping device. In addition, the axial size of the vibration damping device is limited. In a preferred embodiment of the invention, the connection extension is integrated with the pendulum plate.

In a first embodiment the connection extension provides a connection between the pendulum plate and one of the phasing member.

In this embodiment, the pendulum is in particular situated between damping means.

In addition, the damping means situated after the pendulum element may present a greater stiffness than the damping means situated before the pendulum element, in particular between 1.5 and twice greater.

In other words, the damping means situated between the pendulum element and the torque output element may present a greater stiffness than the damping means situated between the torque input element and the pendulum element. In a particular embodiment, the damping means situated between torque input element and the pendulum element are between

1 ,5 and 2 times longer than the damping means situated between the pendulum element and the torque output element.

In a preferred embodiment of the invention, the connection extension is integrated with the phasing member.

In a preferred embodiment of the invention, the connection extension is formed on end of the phasing member.

In a preferred embodiment of the invention, an extension radially extending from the pendulum plate to the connection extension such that the extension and the connection extension are connected to each other.

In an alternative embodiment of the invention, the connection extension is integrated with the pendulum plate.

In a preferred embodiment of the invention, a connection mean providing connection between connection extension and the pendulum plate. In an alternative embodiment of the invention, the connection extension, the pendulum plate and the phasing member are integrated.

In a second embodiment the connection extension provides a connection between the pendulum plate and one of the guide washer. In this embodiment, the pendulum element is in particular situated after damping means.

In other words, the damping means are situated between the torque input element and the pendulum element.

In a preferred embodiment of the invention, the connection extension is formed on end of the guide washer.

In a preferred embodiment of the invention, the connection extension is provided on an inner diameter of the pendulum plate.

In a preferred embodiment of the invention, the connection extension is integrated with the guide washer. In a preferred embodiment of the invention, a connection mean providing connection between connection extension and the pendulum plate.

In a preferred embodiment of the invention, the connection extension, the pendulum plate and the guide washer are integrated.

BRIEF DESCRIPTION OF THE FIGURES Figure 1 shows the isometric view of a first embodiment of the present invention with flywheel.

Figure 1.A shows the top view of the embodiment of Figure 1.

Figure 1.B shows cross section of the damping device along an axis A of Figure 1 A; Figure 2 shows the isometric view of the phasing member and pendulum element of the previous embodiment.

Figure 2. A shows the isometric view of the phasing member of Figure 2. Figure 3 shows the isometric view of a second embodiment of the present invention with flywheel.

Figure 3. A shows the top view of the embodiment of Figure 3.

Figure 3.B shows cross section of the damping device along an axis A of Figure 3A;

Figure 4shows the isometric view of the phasing member of the damping device of Figures 3.A and 3B.

Accompanying drawings are given solely for the purpose of exemplifying a chucking system whose advantages over prior art were outlined above and will be explained in brief hereinafter.

The drawings are not meant to delimit the scope of protection as identified in the claims nor should they be referred to alone in an effort to interpret the scope identified in said claims without recourse to the technical disclosure in the description of the present invention. REFERENCE NUMBERS OF THE DRAWINGS

1. Vibration damping device 10. Hub

20. Intermediate flange

21. Intermediate plate connection mean 30. Transmitting plate

40. Friction lining

41. Pressure plate 50. Load plate

60. Guide washer 70. Phasing member 71. Connection extension

711. Aperture

72. Hub of the phasing member 73. Arm

74. Radius section

80. Pendulum element

81. Pendulum plate

82. Pendulum mass 83. Connection mean

84. Mass aperture

85. Pendulum arm

86. Connection extension

87. Extension 90. Cover

D Damping means F. Flywheel X. Rotation axis

DETAILED DESCRIPTION OF THE INVENTION In this detailed description the vibration damping device 1 subject to the invention have been illustrated with non-limiting examples in order to further describe the subject matter of the invention.

The present invention relates to a torsional damping device, in particular for a motor vehicle transmission system. Referring to Figure 1 , respectively Figure 3, a hub 10 is positioned on the center of the vibration damping device 1. The hub 10 has aperture on its body with splines configured to transmit engine torque provided by the flywheel F to shaft of the gearbox not shown in the figures. Said torque provides rotational movement to the vibration damping device 1 in rotation axis X.

In Figure 1. B, cross section of the Figure 1.A, respectively Figure 3.B, cross section of the Figure 3.A, intermediate flange 20 can be seen. The intermediate flange 20 is coupled with the hub 10 and rotates together. This structure which comprises the hub 10 and the intermediate flange 20 is also defined as a first element in this detailed description.

Guide washers 60 rotationally coupled to the hub 10. Front and back guide washers 60 are positioned axially on both side of intermediate flange 20. Front and back guide washers 60 is also defined as a second element in this detailed description.

Damping means D positioned around the hub 10 and being housed at least partly in a volume defined by the guide washers 60 and the inside of the pockets not shown in figures disposed circumferentially on the intermediate flange 20.

Damping means D acts against the rotation of the first element and the second element 10 respect to each other to filtrate the vibration is caused by engine. When relative movement of the first and second elements starts, damping means D are compress or released according to positions of the guide washer 60 housing and the intermediate flange 20 pockets.

Group of damping means D are arranged in series by means of a phasing members 70 that are mounted freely rotatably with respect to guide washers 60 and with respect to the intermediate flange 20, so that the damping means D of each group deform in phase with one another.

Phase members 70 are centered and rotationally guided on the hub 10 and the intermediate flange 20 and are disposed on either side of the intermediate flange 20. 20 The phasing members 70 are positioned coaxially. Referring to the Fig. 2 and 2. A, respectively Figure 4. Hub of the phasing member 72 is formed on the center of phasing member 70 and enable assembling between the hub 10 and phasing member 70. Arms 73 are formed that extend radially from the hub of the phasing member 72. The embodiments of phasing members 70 are shown in figures having 25 two arms 73.

The vibration damping device 1 has a torque limiting group which comprises two friction linings 40 connected to both side of the transmitting plate 30 and one of them contacts with cover 90 and the other one contacts with the pressure plate 41. The pressure plate 41 apply continual pressure on the friction linings 40 but when the torque transferred via the transmitting plate 30 exceeds the torque limit value, it prevents the transfer of this torque in excess of the previously determined value by ensuring that the friction linings 40 slips between the cover 90 and pressure plate 41.

Said transmitting plate 30 is connected to the intermediate flange 20 by means of intermediate plate connection mean 21. Furthermore, it may be connected to guide washers 60 in an alternative embodiments.

The force is applied to the friction linings 40 for creating friction between friction lining 40 and transmitting plate 30 by means of a load plate 50 compressed in a space. The mentioned space is provided between covers 90 which connected each other. Said covers are centered to the flywheel F by means of rivets or similar and, are connected by means of bolts or similar to receive torque provided by the engine.

Referring to Figure 1.A and 1 B; respectively to Figure 3A and 3.B The vibration damping device 1 has a pendulum element 80. The pendulum element 80 comprising a pendulum plate 81 and a plurality of pendulum masses 82 distributed circumferentially, preferably, both sides of pendulum plate 81.

Pendulum masses 82 are movably coupled to pendulum plate 81. Pendulum arms 85 goes through mass apertures 84 formed on the pendulum masses 82 and connects pendulum mass 82 positioned on both sides of pendulum plate 81. Relative movement of pendulum masses 82 and the pendulum plate 81 also damping vibration caused by the engine. In a preferred embodiment of the invention comprises a connection extension.

In a first embodiment, such as illustrated Figures 1 to 2A,the connection extension 71 provide connection between the phasing member 70 and the pendulum element 80.

In an exemple shown in the figures , the connection extension 71 is integrated with phasing member 70.

Specifically, the connection extension 71 is formed end of the arms 73 and extend to the bottom surface of the pendulum plate 81 and connect each other by means of the connection means. The connection extension 71 has apertures on the surface for such a connection. The connection extension 71 may be connected to the extension 87 formed inner diameter of the pendulum plate 81.

The connection arms 73 and the connection extensions are connect each other via radius section that enable the connection extension 71 reaches to the pendulum plate 81. In an alternative exemple of the first embodiment of the present invention, the connection extension 71 may be integrated with pendulum plate 81 , and extending from inner diameter of the pendulum plate 81 to phasing member 70. not shown in the figures

In an alternative exemple of the first embodiment of the present invention, the connection extension 71 , pendulum plate 81 and phasing member 70 may be integrated, and form as a single piece part not shown in the figures. Such a design is clearly enabling easier assemble process.

In a second embodiment, illustrated as example Figures 3, 3A-B and 4 , the connection extension 86 provide connection between the guide washer 60 and the pendulum element 80.

In an example shown in the figures, the connection extension 86 is integrated with pendulum plate 81. Specifically, the connection extension 86 is on the inner diameter of the pendulum plate 81 and extend to the top surface of the guide washer60 and connect each other by means of the connection means 83. The connection extension 86 has apertures on the surface for such a connection.

In an alternative example of the second embodiment of the present invention, the connection extension 86 may be integrated with guide washer 60, and extending from outer diameter of the guide washer 60 to pendulum plate 81. not shown in the figures.

In another example of the second embodiment of the present invention, the connection extension 86, pendulum plate 81 and guide washer 60 may be integrated, and form as a single piece part. Such a design is clearly enabling easier assemble process.

The protection scope of the invention has been mentioned in the claims that are attached and the invention cannot be limited to the embodiments described in this detailed description. It is clear that a person skilled in the art can provide similar embodiments within the scope of the above-mentioned descriptions without deviating from the main theme of the invention.