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Title:
GEARING FOR CONVEYING ROTARY MOTION WITH CONE ROLLERS AND FRICTION RING ASSEMBLY
Document Type and Number:
WIPO Patent Application WO/2001/053719
Kind Code:
A1
Abstract:
Gearing for conveying rotary motion with cone rollers and friction ring assembly shown on figure 4 is used for continuous transmission ratio change comprising two identical cone rollers (1) with parallel middle axes (O), the said rollers are mutually turned for 180 ° and supported to rotate around axis (O) and to displace axially in both directions. Conveying motion and power from the drive to driven cone roller is performed by rotary friction ring assembly (6) in the shape of the hollow cylinder placed surrounding cone rollers (1) in friction engagement with said rollers (1), comprising firm metal ring casing (6.1), two elastic friction rings (6.2) connected to inner metal casing (6.1) surface trough toothed cone surfaces (6.3). Ring assembly (6) is supported by two sided radial-axial bearing (7) placed around ring casing (6.1), and connected to the screw guides (8) having axes (O') parallel with strait line (P). By screw guide (8) rotation, translation of the ring assembly in the strait line (P) direction is performed and at this moment existing transmission ratio (D'/D') change. Gearing assembly can be applied in different branches of industry such as automobile industry, engineering industry and electric machine building industry and in manufacture of the other vehicles. Likewise, application is possible in and for major power conveying and wide transmission ratio range.

Inventors:
JAMBREK KRUNOSLAV (HR)
Application Number:
PCT/HR2000/000037
Publication Date:
July 26, 2001
Filing Date:
October 19, 2000
Export Citation:
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Assignee:
JAMBREK ZORAN (HR)
SELIGER ZLATA (HR)
JAMBREK KRUNOSLAV (HR)
International Classes:
F16H15/42; (IPC1-7): F16H15/42
Foreign References:
GB343225A1931-02-19
FR632541A1928-01-11
FR859023A1940-12-09
Other References:
None
Attorney, Agent or Firm:
Jambrek, Krunoslav (Zagreb, HR)
Jambrek, Krunoslav (Zagreb, HR)
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Claims:
CLAIMS
1. Gearing for conveying rotary motion with cone rollers and friction ring assembly characterized by two identical cone rollers (1) mutually turned for 180° with parallel middle axis (O) the one cone roller bigger base of the cone portion (1.1) is facing another cone roller cone portion (1.1) smaller base, the cone roller (1) having cone portion (1.1) inclined with respect to middle axis (O) at angle a not greater than 15°, the cone surface (1.1) is coaxial extended into shafts (1.2) having polygonal intersection, the shaft (1.2) extending from the cone surface (1.1) smaller base is supported by radial bearing (2), the radial bearing (2) outer ring (2.2) is joined to the casing (5) by overlapping, the shaft (1. 2) extending from the cone portion (1.1) bigger base is supported by radialaxial bearing (3), the radialaxial bearing (3) outer ring (3.2) joined to the casing (5) by screw joint (3.3) thus enabling radialaxial bearing (3) displacement in both directions of the axis (O) and by the securing element (3.4) supporting to radialaxial bearing (3) outer ring (3.2) screw joint (3.3) fixing, the cone roller (1) rotates around axis (O) and displaces axially in both directions, the shaft (1. 2) ends can slide inside the radial bearing (2) inner ring (2.1) and radialaxial bearing (3) inner ring (3.1), and in the hollow (1.3) in the cone roller (1) bigger base between radialaxial bearing (3) inner ring (3.1) and cone roller (1) on shaft (1.2) is placed pressure spring (4) to realize contact between cone roller (1) and ring assembly (6).
2. Gearing for conveying rotary motion with cone rollers and friction ring assembly according to claim 1, characterized by that ring assembly (6) in the shape of the hollow cylinder is placed surrounding cone rollers (1) constituted by firm metal ring casing (6.1) and two elastic friction rings (6.2) interconnected with metal ring casing (6.1) trough toothed cone surfaces (6.3), whereby friction ring (6.2) teeth fit in casing (6.1) tooting, whereas friction ring (6.2) inner cone generatrix inclination to ring assembly (6) middle axis (O') equals to opposite placed cone rollers (1) cone portion (1. 1) generatrix inclination to its middle axis (O), the ring assembly (6) being supported by double sided radialaxial bearing (7) placed around ring casing (6.1) so that its inner rotating ring (7.1) is fixed to the ring casing (6.1) outer cover, and outer non rotating ring (7.2) is fixed by two or greater even number of the screw guides (8), the screw guide (8) middle axis (O") being parallel to strait line (P) which is parallel to the cone rollers (1) generatrix in contact with friction ring (6.2) inner surfaces which lies in the same plane as strait lines and cone rollers (1) middle axes (O), the screw guides (8) on its ends fixed to the casing (5), rotate driven by electric motors (9) placed on the screw guides (8) free ends with electronic regulation of the rotating direction and number of revolutions, for performing translation of the rotating ring assembly (6) in strait line (P) both directions for continuous transmission ratio change (D'/D").
3. Gearing for conveying rotary motion with cone rollers and friction ring assembly according to claims 1 and 2, characterized by pneumatic or hydraulic systems can be used for linear shifting instead of pressure spring (4).
4. Gearing for conveying rotary motion with cone rollers and friction ring assembly according to claims 1 to 3, characterized by pneumatic or hydraulic systems can be used for linear shifting instead of screw guides (8) with electric motors (9).
5. Gearing for conveying rotary motion with cone rollers and friction ring assembly according to claims 1 to 4, characterized by each of cone rollers (1) can be drive or driven.
6. Gearing for conveying rotary motion with cone rollers and friction ring assembly according to claims 1 to 5, characterized by cone rollers (1) cone portions (1.1) are made of metal or metal alloys and friction rings (6.2) are made of elastic materials such as elastomers (rubber), polymers, Kevlar or solid materials such as metals, metal alloys and ceramic materials reinforced by carbon and/or silicone fibers.
Description:
GEARING FOR CONVEYING ROTARY MOTION WITH CONE ROLLERS AND FRICTION RING ASSEMBLY Technical Field Subject matter of the present invention relates to gearing for conveying rotary motion with variable gear ratio constituted by complementary conical rollers in friction engagement with ring assembly. Gearing is designed for major power conveying with possibility of rotation speed electronic control and more particularly is classified as E-CVT (continuos variable transmission) gearing.

According to the International Patent Classification 6"'edition, present invention is classified as: F 16 H 015/42-Gearings for conveying rotary motion with variable gear ratio by friction between rotary members using ring or using endless flexible members.

Background Art There is a variety of difficulties in the technical field concerning gearing for conveying rotary motion. One of the biggest problem is transmission ratio discontinuity that persists at many current gearing assemblies based on the gear transmission. By increasing number of the gear couples it is possible to divide total transmission ratio area on more minor transmission rates.

By increasing number of gears such transmission assemblies become more complicated and expensive.

Friction transmission assemblies with continuos variable transmission ratio generally serve for minor power transmission at minor transmission rates due the fact that means as wedged and toothed belt can not transmit major power in long terms.

All known friction gearing for conveying rotary motion with continuously variable ratio comprising belts as transmission means have limited possibilities in respect to the force that belts can transmit. Because of the major tensions and frequently change of the variable transmission ratio, the belts rapidly wear and break. Mechanical looses in friction transmission assemblies are converted into heat that is needed to be removed by using complex cooling system. Present friction gearings for conveying rotary motion with continuos variable transmission ratio comprising belts as means for major power transmission are complex and expensive machine assemblies for reasons mentioned above.

This invention relates to gearing for conveying rotary motion with continuous variable transmission ratio comprising cone rollers in frictional engagement with ring assembly placed around cone rollers, which technical solution solves economic manufacturing of the such gearing for major power transmission in long terms.

Disclosure of the Invention Gearing for conveying rotary motion with cone rollers and friction ring assembly with variable gear ratio is constituted by two oppositely disengaged cone rollers with parallel axes supported in casing in mutual conjunction trough rotating friction ring assembly surrounding cone rollers. Ring assembly comprising two part friction ring within metal ring casing lean on cone roller planes. Conveying of the rotary motion and power from one cone roller to another is carried on by friction connection between inner friction ring planes and cone rollers planes.

Both cone rollers rotate in the same direction. Ring assembly supported bay radial-axial bearing rotates in the same direction as cone rollers. Radial-axial outer ring is supported to the gearing casing by screw guides in order that ring assembly can displace, whereby screw guides axes are parallel to cone rollers generatrix in contact with friction ring surfaces. By ring assembly displacement along screw guides, continuous transmission ratio change is performed. By applying of the rotating friction ring assembly as machine element for conveying rotary motion from one cone roller to another is possible to manufacture economic gearing for conveying rotary motion with continuous transmission ratio change with purpose to convey major power. By friction connection between friction ring and cone rollers it is possible to convey relatively major moments of the forces. Teeth connection between friction rings and metal ring assembly casing enables reliable moment transmission from the friction rings to the metal ring assembly casing. Ring assembly composed of metal casing with friction rings represents more simple, durable and reliable transmission assembly than until now known flexible transmission assemblies. By replacement of the flexible transmission elements such as toothed and wedged belt with firm ring assembly it is simplified manufacturing of the transmission elements, the transmission elements lifetime is extended and power looses are decreased.

Figure 1 shows front view of the rotating friction ring assembly with screw guides, Figure 2 shows ground plan of the rotating friction ring assembly, Figure 3 shows cross section A-A of the rotating friction ring assembly from the fig. 2, Figure 4 shows longitudinal cross section in the middle cutting plane going trough the cone rollers and rotating friction ring assembly middle axis, and Figure 5 shows axonometric view illustrating gearing components for power and movement transmission; cone rollers and rotating friction ring assembly.

Rotary motion gearing assembly with cone rollers and friction ring assembly having two identical cone rollers 1 and friction ring assembly 6 supported in the casing 5 by bearings.

Each of the two cone rollers having cone portion 1.1 extended into shaft 1.2, whereby shaft 1.2 has polygonal intersection. Inclination of the cone portion 1.1 with respect to the middle axis O, i. e. cone angle a is not greater than 15°.

The cone roller 1 smaller base is extended into shaft 1.2 and supported by radial bearing 2 for taking over radial forces which transmit during operation to the cone roller 1. On the another end, the cone roller 1 is extended into shaft 1.2 and supported by axial bearing 3 for taking over axial and radial forces that transmit to the cone roller 1. The bigger base of the cone roller 1 is carried out as hollow 1.3 for placing pressure spring 4, the pressure spring 4 one end being supported by axial bearing 3 inner ring 3.1 and by its other end is supported by cone portion 1.1 of the cone roller 1. The pressure spring 4 force is acting in the longitudinal direction of the smaller cone base. Cone roller 1 is supported as to rotate around the axis O and to displace axially in both directions due to shaft 1.2 having polygonal intersection can slide inside the radial bearing 2 inner ring 2.1 and axial bearing 3 inner ring 3. 1. Radial bearing 2 outer ring 2.2 is jointed to the casing 5 by overlapping. Axial bearing 3 outer ring 3.2 is jointed to the casing 5 by screw joint 3. 3. By screw joint 3.3 is carried out displacement of the axial bearing 3 in the longitudinal direction of the axis O which enables axial force regulation by which pressure spring acts to the cone roller 1 in the small base direction. When transmission elements are worn out, axial force by which pressure spring 4 acts to the cone roller 1 is corrected. Radial-axial bearing 3 outer ring 3. 2 is secured by element 3. 4 to prevent unscrewing of the screw joint 3. 3. At the construction of gearing for major power conveying it is possible to replace pressure spring 4 by pneumatic or hydraulic systems.

Cone rollers 1 are placed parallel, mutually turned for 180° so that the one cone roller 1 bigger base cone portion 1.1 is facing another cone roller 1 smaller base cone portion 1.1. Each of the cone rollers 1 can be drive or driven.

Rotating friction ring assembly 6 in the shape of the hollow cylinder surrounding cone rollers 1 is constituted by firm metal ring casing 6.1 and two elastic friction rings 6.2 interconnected with metal ring casing 6.1. Connection between inner firm metal ring casing 6.1 and outer friction rings 6.2 surfaces is carried out by toothed cone surfaces 6.3 so that friction ring 6.2 teeth fit in casing 6.1 tooting. Friction ring inner surface 6.2 generatrix inclination to ring assembly 6 middle axes 0'equals to the cone rollers 1 cone portions 1.1 generatrix inclination to middle axes O.

First friction ring 6.2 is in friction engagement with drive cone roller 1 trough friction surface i. e. the cone roller 1 cover is being impressed against inner cone ring 6.2 cover. Moment of a force from the first friction ring 6.2 in friction engagement with drive cone roller 1 is conveyed trough toothed cone surface 6.3 on casing 6.1, than trough another toothed cone surface 6.3 on the second friction ring 6.2. Second friction ring 6.2 in friction engagement with driven cone roller 1 trough friction surface, as a result of driven cone roller 1 being impressed against inner cone cover of the second rubber ring 6.2, is conveying moment of a force to the driven cone roller 1 connected to the power consumer. Rotary motion and power is conveyed from drive to driven cone roller on the above described way.

Gearing transmission ratio represents ratio between instantaneous drive cone roller 1 effective diameter D'and instantaneous driven cone roller 1 effective diameter D"which are engaged trough friction rings 6.2 with ring assembly 6. Continuous variable gear ratio is achieved by rotating ring assembly 6 translation in straight line P direction, which is parallel to the line of contact between cone roller 1 generatrix and inner friction ring 6.2 surface, lying in the same plane as cone rollers 1 middle axis O. By translation of the rotating ring assembly 6 in straight line P direction, effective diameters D'and D"are continuously changing, i. e. transmission ratio.

During operation, pressure springs 4 axial forces acting on cone rollers 1 effect moment of forces that endeavor to cause ring assembly 6 rotation in the plane in which cone roller 1 middle axis O and ring assembly 6 middle axis O'are lying. Likewise, difference between radial force by which cone rollers are acting on ring assembly 6 endeavor to cause its translation in the same plane in direction perpendicular to middle axis O and O'. Due to such complex load, during operating it is necessary to support ring assembly by bearing to prevent its translation and rotation. Ring assembly bedding is realized by double sided radial-axial bearing 7 placed around ring casing 6.1 so that its inner rotating ring 7.1 is fixed to the ring casing 6.1 outer cover, and outer non rotating ring 7.2 is fixed by the screw guides 8.

Screw guides 8 axis O"are parallel to the straight line P by which rotating ring assembly 6 translates. By coordinated upper screw guides 8 unscrewing and by winding up lover screw guides 8 or, vice versa, rotating ring assembly 6 is translating in straight line P direction, by which effective diameters D'and D"are changing, respectively transmission ratio.

Screw guides 8 ends are fixed to the casing 5. Their rotation is performed by electric motors 9 placed on the screw guides 9 free ends with electronic regulation of the rotating direction and number of revolutions. In order to secure reliable transmission ratio change it is necessary to connect ring assembly 6 with at least two screw guides 8 or even number of mutually parallel screw guides 8. It is possible to replace screw guides 8 by pneumatic or hydraulic systems for linear displacement performing. Power conveyed from drive to driven cone roller 1 depends upon friction couples friction properties of the cone rollers 1 cone portion 1.1 and friction rings 6.2 that serve for power and motion conveying. Friction couples have to be made of material with high friction coefficient, stabile in mutual contact in wide range of heat and mechanical stresses. The largest friction coefficients attain at cone portions 1.1 made of metal or metal alloys and at friction rings (6.2) made of elastic materials such as elastomers (rubbers), polymers, Kevlar or solid materials such as metals, metal alloys and ceramic materials reinforced by carbon and/or silicone fibers.

According to the described embodiment it is possible to manufacture gearings of a different power and different transmission ratio range.

Gearing for conveying rotary motion with cone rollers and friction ring assembly can be applied in different branches of industry. The largest use is possible in automobile industry and in manufacture of the other vehicles. Likewise, application is possible in engineering industry and electric machine building industry and for applying in machine tools, tools and in all kinds of machines using variable gear ratio assemblies.