Continuously variable transmission and operating method therefor

• US 20090197731A1
• Filed: 07/31/2006
• Published: 08/06/2009
• Est. Priority Date: 07/29/2005
• Status: Active Grant

• Current Assignee: U.M.S. - Maschinenbau GmbH
• Original Assignee: U.M.S. - Maschinenbau GmbH
• Inventors: Kobler, Peter
• Granted Patent: US 8,262,529 B2
• Time in Patent Office: Days
• US Class Current: 475/166
• CPC Class Codes: F16H 29/04 in which the transmission ratio is changed by adjustment of a crank, an eccentric, a wobble-plate, or a cam, on one of the shafts

Abstract

The invention relates to a continuously variable transmission (1) comprising a driven rotary part (2), a chassis (4) or housing, and a driving rotary part (3). The invention also relates to an associated operating method whereby the driven rotary part (2) or the chassis (4) or housing is coupled to a first guide or drive module (5,5′). A second guide module (14) is also provided, the two guide or drive modules (5,5′, 14) being connected to a chassis (4) or housing of the transmission (1) or an adjacent machine or installation part, such that the second guide module (14) can be displaced in relation to the first guide or drive module (5, 5′). Furthermore, the two guide or drive modules (5,5′, 14) are coupled to each other by means of at least two mechanisms, each consisting respectively of a first coupling module (7a-7d) and a second coupling module (8a-8d) which are mounted (9a-9d) or guided against each other and/or can mesh with each other. A transport displacement of the deflection angle co of the rotary displacement of the first or second coupling module (7a-7d, 8a-8d) in question is cyclically transferred to another rotary part (18), and the rotary axes of the rotary connections of a free wheel (16a-16d) are aligned.

Claims

1. A continuously variable transmission (1;

31) to transfer a relative rotary motion between at least one first driven rotary part (2;

32) and a housing on at least a second driving rotary part (3;

33), the transmission comprising;

a) the first driven rotary part (2;

32) or the housing being coupled with a first guide module (5,5′

;

35);

b) a second guide module (14) being provided;

c) the two guide modules (5,5′

,14;

35) being connected with the housing of the transmission (1;

31) or with an adjacent part, rotatably or swivelably mounted thereon, such that the second guide module (14) can be displaced with respect to the first guide module (5, 5′

;

35);

d) the two guide modules (5,5′

,14;

35) being coupled with one another by means of at least two coupling mechanisms, each consisting of a first coupling module (7a-7d) and a second coupling module (8a-8d), which are mounted on one another and/or mesh with one another;

e) the first coupling module (7a-7d) of each coupling mechanism being coupled with the first guide module (5,5′

;

35), such that the first coupling module is rotatable around one of several rotational axes (M1,M2,M3,M4) which are parallel to its rotational straight line but excentric or fixed to one of several fastening points which are excentric to its rotational straight line;

f) the second coupling module (8a-8d) of each coupling mechanism is coupled with the second guide module (14), independent of second coupling modules (8a-8d) of the remaining coupling mechanisms, mounted such that it can rotate around an axis common to all connected second coupling modules (8a-8d), the common axis not revolving excentrically during operation;

g) and a first and/or second coupling module (7a-7d;

8a-8d) of each coupling mechanism being mounted on a rotational axis (M1, M2, M3, M4;

3), whose distance from the point of rotation with the associated other coupling module (7a-7d;

8a-8d) exhibits a specified radius (d1-d4);

h) the first or second coupling module (7a-7d;

8a-8d) of each coupling mechanism being coupled with at least a first rotary connection of a freewheel (16a-16d), whose other rotary connection is coupled with a second rotary part (18), such that a transport movement of the deflection angle of the rotary movement of the relevant first or second coupling module (7a-7d, 8a-8d) is cyclically transferred to the second rotary part (18), and the rotary axes of the rotary connections of the freewheel (16a-16d) being aligned with one another;

i) and the second rotary part (18) and the first driven and second driving rotary parts (2,3;

32,33) being coupled each to different connections (19,23,25) of a differential transmission module (20).

2. The continuously variable transmission according to claim 1, wherein the first guide module (5,5′

;

35) is mounted such that the first guide module can rotate around a rotational axis (AA) with respect to the transmission housing.

3. The continuously variable transmission according to claim 2, wherein the first guide module (5,5′

;

35) is coupled in a rotationally fixed manner with a drive rotary part (2,3;

32).

4. The continuously variable transmission according to claim 2, wherein the first guide module (5,5′

;

35) exhibits at least one segment of the shape of a disk, whose base plane is crossed by the rotational axis (AA) generally perpendicularly.

5. The continuously variable transmission according to claim 1, wherein the first guide module (5,5′

;

35) exhibits at least two disk-shaped segments parallel to one another.

6. The continuously variable transmission according to claim 5, wherein the second guide module (14) exhibits a rotationally symmetrical guide surface, which is a selected one of convexly and concavely curved.

7. The continuously variable transmission according to claim 6, wherein the second guide module (14) is displaceable with respect to the first driven rotary part and with respect to the rotational axis (AA) of the first guide module.

8. The continuously variable transmission according to claim 1, wherein the two coupling modules (7a-7d;

8a-8d) of the coupling mechanism are guided with one another and/or movably joined with one another (9a-9d), such that a change in distance between the relevant rotational axes (M1,M2,M3,M4) at the first guide module (5,5′

;

35) and the pivot point at the second guide module causes a relative twisting of at least one coupling module (7a-7d;

8a-8d) around its pivot or rotational axis (M1,M2,M3,M4).

9. The continuously variable transmission according to claim 2, wherein the coupling module (7a-7d) of each coupling mechanism coupled with the first guide module (5,5′

) crosses at least one disk-shaped segments of the guide module (5,5′

) excentrically to the rotational axis (AA).

10. The continuously variable transmission according to claim 2, wherein the coupling module (7a-7d) of each coupling mechanism coupled with the first guide module (5,5′

) comprises a coupling module (7a-7d) which is mounted such that it can rotate around one of its own rotational axes (M1,M2,M3,M4) excentric to its rotational axis (AA) in at least one disk-shaped segment of the first guide module (5,5′

).

11. The continuously variable transmission according to claim 1, wherein the second coupling module (8a-8d) coupled with the second guide module (14) exhibits a surface that is complementary to its rotationally symmetrical guide surface.

12. The continuously variable transmission according to claim 1, wherein the second coupling module (8a-8d) coupled with the second guide module (14) comprises a lever.

13. The continuously variable transmission according to claim 12, wherein the coupling module (8a-8d) of each coupling mechanism comprises a lever (8a-8d), the levers (8a-8d) of each coupling mechanism being mounted such that they rotate independently of one another around the rotational axis of a rotationally symmetrical guide surface of the first guide module.

14. The continuously variable transmission according to claim 13, wherein the levers (8a-8d) each exhibit a bearing sleeve (13) for the independent mounting of a guide surface such that the lever rotates around the guide axis (12).

15. The continuously variable transmission according to claim 13, wherein the levers (8a-8d) each exhibit a projecting sleeve (13) of different cross sections that mesh with one another in the area of the guide surface belonging to the second guide module in the bearing star point (11) perpendicular to the lever (8a-8d) for the independent mounting of a guide surface such that it rotates around the rotational axis, in particular a guide axis (12).

16. The continuously variable transmission according to claim 13, wherein a surface, which runs parallel to the rotational axis (M1,M2,M3,M4), is provided for coupling with the other lever (8a-8d), on each coupling module (7a-7d) that is coupled with the first guide module (5,5′

;

35), excentric to its rotational axis (M1,M2,M3,M4).

17. The continuously variable transmission according to claim 1, wherein a surface of a coupling module (7a-7d;

8a-8d) for coupling with the other coupling module (7a-7d;

8a-8d) comprises a selected one of a row of teeth or friction surface.

18. The continuously variable transmission according to claim 17, wherein at least one coupling module (7a-7d;

8a-8d) comprises a link chain.

19. The continuously variable transmission according to claim 17 wherein one coupling module (7a-7d) is adapted to engage with the row of teeth of the other coupling module (8a-8d).

20. The continuously variable transmission according to claim 19, wherein a coupling module (7a-7d) is adapted to engage as a toothed gear with the row of teeth of the other coupling module (8a-8d).

21. The continuously variable transmission according to claim 1, wherein a freewheel is arranged on each coupling module (7a-7d;

8a-8d) of each coupling mechanism.

22. The continuously variable transmission according to claim 21, wherein rotary movements of the coupling modules (7a-7d;

8a-8d) coupled with a common guide element are combined to coupling mechanisms beyond the freewheels (16a-16d).

23. The continuously variable transmission according to claim 22, wherein all freewheels (16a-16d) are oriented such that the fastest rotary movement in a shared orientation direction of rotation is transferred.

24. The continuously variable transmission according to claim 22 wherein toothed planet gears (17) which mesh with a toothed sun gear (are provided beyond the freewheels (16a-16d).

25. A continuously variable transmission (1;

31) comprising at least a first rotary drive shaft, and a second rotary output shaft

a) the first drive shaft being coupled with a first guide module (5,5′

;

35);

b) a second guide module, comprising a guide lever;

c) the first and second guide modules (5,5′

14) being connected with a selected one of a housing of the transmission (1;

31) and an adjacent installation part rotatably mounted thereon, such that the second guide module can be displaced with respect to the first guide module;

d) the two guide modules (5,5′

,14;

35) being coupled with one another by means of at least two mechanisms, each mechanism comprising a first coupling module (7a-7d) and a second coupling module (8a-8d) mounted (9a-9d) on one another;

e) the first coupling module (7a-7d) of each of the coupling mechanisms being coupled with the first guide module, such that it rotates around one of several rotational axes (M1,M2,M3,M4) which are parallel to its rotational straight line but excentric, or fixed to one of several fastening points which are excentric to, its rotational straight line;

f) while the other coupling module (8a-8d) of each of the coupling mechanisms is coupled with the second guide module (14), independent of the coupling modules (8a-8d) of the remaining coupling mechanisms, mounted such that it can rotate around an axis (11) common to all connected coupling modules (8a-8d), the common axis (11) not revolving excentrically during operation;

g) a first and/or second coupling module (7a-7d;

8a-8d) of each coupling mechanism being mounted on a rotational axis (M1,M2,M3,M4;

11), whose distance from the point of contact with the associated, other coupling module (7a-7d;

8a-8d) exhibits a specified radius (d1-d4);

h) a first or second coupling module (7a-7d;

8a-8d) of each coupling mechanism being coupled with at least a first rotary connection of a freewheel (16a-16d), whose other rotary connection is coupled with a second rotary part (18), such that a transport movement of a deflection angle of the rotary movement of the relevant first or second coupling module (7a-7d, 8a-8d) is cyclically transferred to the second rotary part (18), and the rotary axes of the rotary connections of the freewheel (16a-16d) are aligned with one another; and

i) the second rotary part (18), the first and second rotary parts are coupled each to different connections (19,23,25) of a differential transmission module (20);

wherein the change in the distance between the rotational axis (M1,M2,M3,M4) at the first guide module (5,5′

;

35) and the pivot point at the second guide module (14) during a revolution of the guide modules (14;

5,5′

;

35) around one another, or around the excentric rotary axis, results in a relative twisting of at least one coupling transmission module (7a-7d), around its rotational axis (M1,M2,M3,M4).

26. The transmission according to claim 25, wherein the rotational movement transferred to the coupling module (7a-7d), is transferred by means of the respective associated freewheel (16a-16d) on the output shaft, or on a differential transmission module (20) connected before it.

27. The transmission according to claim 25, wherein a bearing star point of the second guide module (14), is deflected from a base position in order to vary the gear ratio, with the result that the amplitude of the rotational movement which the transmission modules undergo changes by means of the drive lever.

28. The transmission according to claim 27, wherein a gear ratio of the continuously variable transmission (1;

31) depends on the deflection of the bearing star point (11) from the drive axis (AA) of the drive module (5;

5′

) (35).

29. The transmission according to claim 27, wherein in a base position, the gear ratio of the transmission (1;

31) equals zero.

30. The transmission according to claim 29, wherein in the base position, the bearing star point (11) aligns with the rotational axis (AA) of the drive module (5;

5′

).

31. A method of operating a continuously variable transmission (1;

31) with at least a first rotary part, in particular a drive shaft (2;

32), ring or -cylinder, a chassis (4;

34) or housing and at least a second rotary part, in particular an output shaft (3;

33), ring or cylinder,

a) the first rotary part (2;

32) or the chassis (4;

34) or housing being directly or indirectly coupled with a first guide or drive module (5,5′

;

35);

b) a second guide module, particularly a guide lever (14) or a mounting element being provided;

c) the two guide or drive modules (5,5′

14) being connected with a chassis (4;

34) or housing of the transmission (1;

31) or of an adjacent machine or installation part, especially rotatably or swivelably mounted or guided on it, such that the second guide module (14) can be displaced with respect to the first guide or drive module (5,5′

;

35);

d) the two guide or drive modules (5,5′

,14;

35) being coupled with one another by means of at least two mechanisms, each consisting of a first coupling module (7a-7d) and a second coupling module (8a-8d), which are mounted (9a-9d) or guided on one another and/or mesh with one another;

e) and the first coupling module (7a-7d) of each coupling mechanism being coupled with the first guide or drive module (5,5′

;

35), such that it can rotate around one of several rotational axes (M1,M2,M3,M4) which are parallel to its rotational straight line but excentric or fixed to one of several fastening points which are excentric to its rotational straight line;

f) while the other coupling module (8a-8d) of each coupling mechanism is coupled with the second guide module or lever (14), independent of the relevant coupling modules (8a-8d) of the remaining coupling mechanisms, mounted such that it can rotate around an axis (11) common to all connected coupling modules (8a-8d), the common axis (11) not revolving excentrically during operation;

g) and a first and/or second coupling module (7a-7d;

8a-8d) of each coupling mechanism being mounted on a rotational or swivel axis (M1,M2,M3,M4;

11), whose distance from the point of rotation or contact or engagement or area with the associated, other coupling module (7a-7d;

8a-8d) exhibits a specified radius (d1-d4);

h) furthermore, a first or second coupling module (7a-7d;

8a-8d) of each coupling mechanism being directly connected or indirectly coupled with at least a first rotary connection of a freewheel (16a-16d), whose other rotary connection is directly or indirectly coupled with a second rotary part (18), such that a transport movement of the deflection angle ω

of the rotary movement of the relevant first or second coupling module (7a-7d, 8a-8d) is cyclically transferred to a further rotary part (18), and the rotary axes of the rotary connections of a freewheel (16a-16d) being aligned with one another;

i) and finally the further rotary part (18) and the first and second rotary parts (2,3;

32,33) being coupled each to different connections (19,23,25) of a differential transmission module (20);

characterized in that the change in the distance between the rotational axis (M1,M2,M3,M4) at the first guide part (5,5′

;

35) and the pivot point at the second guide part (11,12,14) during a revolution of the guide parts (11,12,14;

5,5′

;

35) around one another or around the excentric rotary axis results in a relative twisting of at least one coupling module (7a-7d;

8a-8d), in particular transmission module (7a-7d), around its pivot or rotational axis (M1,M2,M3,M4).