Granted Patent B2

US 7,886,885 · App. 11/780,319 · Granted Feb 15, 2011

Abstract

Claims (30)

1. A clutch comprising:

a reaction plate for exerting a compression force;

a friction plate disposed adjacent the reaction plate for frictionally engaging the reaction plate to transfer a driving torque between the reaction plate and the friction plate when the compression force is applied;

a compressible resilient friction layer attached to the friction plate and opposing the reaction plate, the friction layer has a coefficient of friction that is sufficient to prevent relative rotation of the reaction and friction plates when the friction layer is compressed by the reaction plate, wherein the friction layer has a thickness, and wherein the friction layer has at least one groove;

at least one non-compressible member disposed in the at least one groove for preventing further compression of the friction layer by the reaction plate, wherein the at least one non-compressible member is adhered to the friction plate, and wherein the at least one non-compressible member has a predefined height; and

a fluid lubricant disposed between the reaction plate and the friction plate for providing a lubrication layer between the plates; and

wherein the friction plate and the at least one non-compressible member further comprise at least one aperture for allowing the fluid lubricant to pass through the friction plate and the at least one non-compressible member to contact the reaction plate, and

wherein the predefined height of the at least one non-compressible member is greater than the thickness of the friction material layer after the friction layer has been compressed when the clutch is in a low speed slip operating condition.

2. The clutch of claim 1 further comprising three grooves in the friction layer having three non-compressible members disposed in each of the three grooves for preventing further compression of the friction layer by the reaction plate.

3. The clutch of claim 1 wherein the at least one non-compressible member is made primarily of metal.

4. The clutch of claim 1 wherein the friction layer is made primarily of a porous material that allows the lubricating fluid to move through the friction layer.

5. The clutch of claim 4 wherein the friction layer will return to an initial height of the friction layer prior to being compressed by the reaction plate.

6. The clutch of claim 4 wherein the friction layer is made of a woven carbon fiber based material.

7. The clutch of claim 1 wherein the at least one non-compressible member has a height that is less than a thickness of the friction layer before the friction layer is compressed by the reaction plate.

8. The clutch of claim 1 wherein the at least one non-compressible member has a predefined height that prevents the friction layer from being plastically deformed.

9. The clutch of claim 1 wherein the at least one non-compressible member has a predefined height that is substantially equal to the thickness of the friction material layer after the friction layer has been compressed when the clutch is in a high speed slip operating condition.

10. A clutch comprising:

a reaction plate for exerting a compression force;

a friction plate disposed adjacent the reaction plate for frictionally engaging the reaction plate to transfer a driving torque between the reaction plate and the friction plate when the compression force is applied;

a compressible friction layer attached to the friction plate and opposing the reaction plate, the friction layer having a coefficient of friction that is sufficient to prevent relative rotation of the reaction and friction plates when the friction layer is compressed by the reaction plate, wherein the friction layer has a thickness, and wherein the friction layer has at least one groove extending radially from the inner periphery of the friction plate to the outer periphery of the friction plate;

at least one non-compressible member disposed in the at least one groove for preventing further compression of the friction layer by the reaction plate, wherein the at least one non-compressible member is adhered to the friction plate, and wherein the at least one non-compressible member has a predefined height; and

a fluid lubricant disposed between the reaction plate and the friction plate for providing a lubrication layer between the plates; and

wherein the friction plate and the at least one non-compressible member further comprise at least one aperture for allowing the fluid lubricant to pass through the friction plate and the at least one non-compressible member to contact the reaction plate,

wherein the at least one non-compressible member has a predefined height that is substantially equal to the thickness of the friction material layer after the friction layer has been compressed when the clutch is in a high speed slip operating condition, and

wherein the at least one non-compressible member has a predefined height that is greater than the thickness of the friction material layer after the friction layer has been compressed when the clutch is in a low speed slip operating condition.

11. The clutch of claim 10 further comprising three grooves in the friction layer having three non-compressible members disposed in each of the three grooves for preventing further compression of the friction layer by the reaction plate.

12. The clutch of claim 10 wherein the at least one non-compressible member is made primarily of metal and wherein the friction layer is made primarily of a porous material that allows the lubricating fluid to move through the friction layer.

13. The clutch of claim 10 wherein the friction layer is made of a woven carbon fiber based material.

14. The clutch of claim 10 wherein the at least one non-compressible member has a height that is less than a thickness of the friction layer before the friction layer is compressed by the reaction plate.

15. The clutch of claim 10 wherein the at least one non-compressible member has a predefined height that prevents the friction layer from being plastically deformed.

Assignments (12)