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1. WO1998014712 - PISTON FOR TORQUE TRANSMITTING SYSTEMS

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[ EN ]

What is claimed is:

1. A device for actuating force-receiving members of a torque transmission apparatus, the force-receiving members engaging first and second rotatable members, said device comprising a body with a working face adapted to apply a force to the force-receiving members, wherein at least a portion of said working face comprises an arcuate surface .

2 The device of claim 1 wherein a portion of said working face comprises a flat surface.

3. The device of claim 2 wherein said arcuate surface extends tangentially from said flat surface.

4. A piston for applying a force to interleaved discs of a torque transmission apparatus, the interleaved discs engaging first and second relatively rotatable members, said piston comprising a body with a working face adapted to apply a force to the interleaved discs, wherein at least a portion of said working face comprises an arcuate surface.

5. The piston of claim 4 wherein a portion of said working face comprises a flat surface.

6. The piston of claim 5 wherein said arcuate surface extends tangentially from said flat surface.

7. In a torque transmission apparatus including interleaved discs for engaging inner and outer rotational members and a piston located radially between the inner and outer rotational members for actuating the
interleaved discs, the improvement comprising: a piston body comprising a working face adapted to apply a force to one of the discs located adjacent said working face, at least a portion of said working face comprising an arcuate surface.

8. The improvement of claim 7 wherein a portion of said working face comprises a flat surface.

9. The improvement of claim 8 wherein said arcuate surface extends tangentially from said flat surface.

10. The improvement of claim 9 further comprising a support member disposed adjacent an axial end of the discs that is located distally from said working face.

11. The improvement of claim 10 wherein said support member is disposed adjacent an outer portion of the discs and said working face is adapted to avoid contacting the outer portion of an adjacent one of the discs .

12. The improvement of claim 10 wherein said support member is disposed adjacent an inner portion of the discs and said working face is adapted to avoid contacting the inner portion of an adjacent one of the discs .

13. The improvement of claim 10 further comprising an end plate disposed axially between said support member and one of the discs.

14. A method of actuating force-receiving members of a torque transmission apparatus, the force-receiving members engaging first and second rotatable members, comprising the steps of
engaging the force receiving members with a working face of a force-transmitting device, and
applying a force against said force-receiving members with an arcuate surface of said working face.

15. The method of claim 14 wherein the force-receiving members are interleaved discs, and said device applies a force for clamping the discs against a support member disposed at an end of the discs that is located distally from said working face.

16. The method of claim 15 wherein said support member is disposed at an outer portion of the discs and said working face avoids contacting the outer portion of an adjacent one of the discs.

17. The method of claim 16 wherein said working face comprises a flat portion that engages the adjacent disc .

18. The method of claim 15 wherein said support member is disposed at an inner portion of the discs and said working face avoids contacting the inner portion of an adjacent one of the 'discs.

19. The method of claim 18 wherein said working face comprises a flat portion that engages the adjacent disc.

20. The method of claim 14 comprising applying a force on an adjacent one of the force-receiving members so that a contact area increases in a direction from an inner portion of said working face toward an outer portion of said working face as the force is increased.