Transmission

• US 7,574,935 B2
• Filed: 09/29/2003
• Issued: 08/18/2009
• Est. Priority Date: 09/30/2002
• Status: Expired due to Fees

• Current Assignee: Ulrich Rohs
• Original Assignee: Ulrich Rohs
• Inventors: Rohs, Ulrich, Drager, Christoph, Brandwitte, Werner
• Primary Examiner(s): PANG, ROGER L
• Application Number:
  US10/529,605
• Publication Number:
  US 20070004556A1
• Time in Patent Office: 2,150 Days
• Field of Search: 475/193, 475/194, 475/209, 475/210, 475/211, 475/214, 475/215, 475/216, 475/217, 475/218, 743/48, 743/49, 474 61- 63, 474/83, 476 51- 53
• US Class Current: 74/349
• CPC Class Codes: F16H 15/42 in which two members co-operate by means of rings or by means of parts of endless flexible members pressed between the first mentioned members
• CPC Class Codes: F16H 37/021 toothed gearing combined with continuous variable friction gearing
• CPC Class Codes: F16H 37/022 the toothed gearing having orbital motion
• CPC Class Codes: F16H 37/0853 CVT using friction between rotary members having a first member of uniform effective diameter cooperating with different parts of a second member
• CPC Class Codes: F16H 37/086 CVT using two coaxial friction members cooperating with at least one intermediate friction member
• CPC Class Codes: F16H 47/085 with at least two mechanical connections between the hydraulic device and the mechanical transmissions
• CPC Class Codes: F16H 48/08 comprising bevel gears
• CPC Class Codes: F16H 61/66272 characterised by means for controlling the torque transmitting capability of the gearing
• CPC Class Codes: Y10T 74/19344 Multiple cone

Abstract

In a transmission having two revolving transmission elements, each of which has at least one running surface for a revolving coupling element, at least one running surface having at least two running paths for the coupling element having different running radii and the two transmission elements being braced, while incorporating the coupling element, via a bracing device which presses the two transmission elements against the coupling element with a variable pressure, the bracing device comprises a pressure device connected in series with a spring element.

Claims

1. A transmission having two cones as revolving transmission elements, each of which has at least one running surface for a revolving ring as a revolving coupling element, said at least one running surface having at least two running paths for the coupling element having different running radii, said ring surrounding one of said cones and passing through a constant gap between said transmission elements, said two transmission elements being braced, with the coupling element incorporated, via a bracing device which presses the two transmission elements against the coupling element with a variable pressure, wherein the bracing device comprises a pressure device (8), which presses the running surface (12) of a first of the two transmission elements (4, 5) against the coupling element (7) with a variable pressure and, in addition, is supported on a bracing bearing (9), and a spring element (13, 14) which is positioned to act in series with the pressure device.

2. The transmission according to claim 1, wherein spring element (13, 14) comprises radial recesses (18, 19) or radial projections for transmitting torque.

3. The transmission according to claim 1, wherein a torque sensor is provided on the drive side and/or output side and the pressure of the pressure device (8) is selected as a function of the torque determined.

4. The transmission according to claim 1, wherein a pressure caused by a torque and/or a displacement of components (4, 11, 13, 14, 15, 16) of the pressure device caused by a torque is used to measure the torque.

5. The transmission according to claim 1, wherein a connecting gap is provided between at least one of the revolving transmission elements and said coupling element during operation.

6. The transmission according to claim 5, wherein said connecting gap being filled with a liquid.

7. The transmission according to claim 1, wherein at least one of the revolving transmission elements and/or the coupling element is wetted with a liquid which comprises methyl siloxanes, dimethyl diphenyl siloxanes, and/or methyl phenyl siloxanes having phenyl groups.

8. The transmission according to claim 7, wherein at least one of the revolving transmission elements and/or the coupling element is wetted with a liquid which comprises polydimethyl siloxanes, polydimethyl diphenyl siloxanes, and/or polymethyl phenyl siloxanes having phenyl groups, and/or which are alkyl-substituted γ

-trifluoropropyl-substituted.

9. The transmission according to claim 7, wherein the liquid has components with organic substituents.

10. The transmission according to claim 1, wherein least one of the revolving transmission elements and/or the coupling element is wetted with a liquid whose viscosity is stabilized in regard to temperature.

11. The transmission according to claim 1, wherein at least one of the revolving transmission elements and/or the coupling element is wetted with a liquid whose viscosity changes with a temperature-dependent viscosity gradient, which lies between the viscosity gradient (80) of mineral oils and the viscosity gradients (81) of dimethyl siloxanes.

12. The transmission according to claim 1, wherein at least one of the revolving transmission elements and/or the coupling element is wetted with a liquid whose compressibility changes with a temperature-dependent compressibility gradient, which lies between the compressibility gradient of mineral oils and the compressibility gradients of dimethyl siloxanes.

13. The transmission according to claim 1, wherein said spring element (13) transmits both the variable pressure and a torque between the running surface (12) of the first transmission element (4) and the bracing device and/or between the running surface (12) of the first transmission element and the pressure device (8).

14. A transmission having two cones as revolving transmission elements, each of which has at least one running surface for a revolving ring as a revolving coupling element, said at least one running surface having at least two running paths for the coupling element having different running radii, said ring surrounding one of said cones and passing thru a constant gap between said transmission elements, said two transmission elements being braced, with the coupling element incorporated, via a bracing device which presses the two transmission elements against the coupling element with a variable pressure, wherein the bracing device comprises a pressure device (8) having two pressure elements (15, 16) and at least one rolling element (17), which rolls on a rolling element path as a function of torque, which is implemented in such a way that a first pressure element (15) is displaced in relation to the second pressure element (16) in the direction of the pressure when the rolling element (17) changes its position on the rolling element path as a function of torque.

15. The transmission according to claim 14, wherein a torque sensor is provided on the drive side and/or output side and the pressure of the pressure device (8) is selected as a function of the torque determined.

16. The transmission according to claim 14, wherein a pressure caused by a torque and/or a displacement of components (4, 11, 13, 14, 15, 16) of the pressure device caused by a torque is used to measure the torque.

17. The transmission according to claim 14, wherein the bracing device comprises a pressure device (8), which presses the running surface (12) of a first of the two transmission elements (4, 5) against the coupling element (7) with a variable pressure and, in addition, is supported on a bracing bearing (9), and a spring element (13, 14) which is positioned to act in series with the pressure device.

18. The transmission according to claim 17, wherein spring element (13, 14) comprises radial recesses (18, 19) or radial projections for transmitting torque.

19. A transmission having two revolving transmission elements, each of which has at least one running surface (50, 51) for a revolving coupling element, at least one of the running surfaces having at least two running paths for the coupling element having different running radii and actuating means being provided, via which the coupling element may be adjusted from one of the two running paths to the other of the two running paths and which comprises an activatable actuator (415, 416;

455), wherein the actuating means comprise a safety device which adjusts the coupling element into a safety running path if the activatable actuator breaks down.

20. The transmission according to claim 19, wherein the safety device comprises at least one spring.