Abstract: A clutch assembly for a motor vehicle includes a retainer assembly having an upper and lower portion separable by a separating member. The separable member causes the retainer assembly to contract in response to movement toward a released position. Contracting the retainer assembly in the release position provides for additional clearance between the friction discs and flywheel without a corresponding increase in the length of travel of the retainer assembly. The guide member is stationary relative to the retainer assembly and cooperates with the separating member to cause the retainer assembly to expand and contract during movement to engage and disengage the clutch. Additional movement of the retainer assembly increases clearance to between the flywheel and friction discs without corresponding increase in retainer assembly travel to minimize clutch drag.

Abstract: An improved clutch has a distinct force ratio for holding than it does for release. A distinct ratio is achieved by having an abutment surface between a retainer and a diaphragm spring be positioned radially outward from a contact location between a release sleeve and the diaphragm spring for releasing the clutch. The retainer is separately axially movable relative to the release sleeve, and surrounds the release sleeve. In this way, the holding force is applied at a lever distance from an axial center line of the clutch which is greater than the distance to the point of contact for release of the diaphragm spring. This provides both a higher holding force and yet a lower release force.

Abstract: A clutch assembly for a motor vehicle includes a retainer assembly having an upper and lower portion separable by a separating member. The separable member causes the retainer assembly to contract in response to movement toward a released position. Contracting the retainer assembly in the release position provides for additional clearance between the friction discs and flywheel without a corresponding increase in the length of travel of the retainer assembly. The guide member is stationary relative to the retainer assembly and cooperates with the separating member to cause the retainer assembly to expand and contract during movement to engage and disengage the clutch. Additional movement of the retainer assembly increases clearance to between the flywheel and friction discs without corresponding increase in retainer assembly travel to minimize clutch drag.

Abstract: A bearing release assembly includes a release bearing housing actuated by a release fork to move axially along a rotating shaft. The release bearing housing moves a release sleeve axially along the rotating shaft to disengage clutch levers in response to pivotal movement of a release fork. The release sleeve includes an oil-impregnated powdered metal insert in sliding contact with the rotating shaft. The oil-impregnated powdered metal insert is self-lubricating to eliminate the need for periodic maintenance and lubrication of the release sleeve simplifying operation and maintenance of a clutch assembly.

Abstract: An improved clutch has a distinct force ratio for holding than it does for release. A distinct ratio is achieved by having an abutment surface between a retainer and a diaphragm spring be positioned radially outward from a contact location between a release sleeve and the diaphragm spring for releasing the clutch. The retainer is separately axially movable relative to the release sleeve, and surrounds the release sleeve. In this way, the holding force is applied at a lever distance from an axial center line of the clutch which is greater than the distance to the point of contact for release of the diaphragm spring. This provides both a higher holding force and yet a lower release force.