Patent 4791832 Issued on December 20, 1988. Estimated Expiration Date: December 20, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
A torque proportioning differential utilizing helical face side gears and helical pinions is disclosed which is equivalent in torque capacity and interchangeable with bevel gear differentials in the same case and which is economical to manufacture.A differential structure, interchangeable with bevel gear differential components in the same case, composed of a drive cage in which are pocketed up to 8 helical pinions; two helical face side gears in concentric relationship on each side of the cage with teeth engaging the helical pinions; thrust-friction plates fixed alternately to the side gears and the cage and spring mechanism for pre-loading the friction plates. The helical face side gears connect with axle shafts to drive the load.