Abstract: A differential gear apparatus includes a housing for rotation about a predetermined axis under the power of an external power source, and a lubricating oil reservoir and worm gear arrangement mounted in the housing for rotation. A lubricating arrangement is disposed with respect to the housing for guiding the lubricating oil from the lubricating oil reservoir to the work gears against centrifugal force created by rotation of the housing.

Abstract: A clutch disc includes a hub connected to a torque output shaft, an inner hub flange formed as an integral part of the hub, an outer hub flange arranged in concentric fashion on the outer side of the inner hub flange so as to rotate freely via a spline through a prescribed angle with respect to the inner hub flange, main and auxiliary disc plates arranged on both sides of the two flanges in the axial direction thereof and connected to the torque input shaft, and sliding friction arrangement provided between the flanges and the disc plates. A cylindrical portion is provided on a portion of the outer hub flange, and annular friction members are fitted between an inner circumferential surface of the cylindrical portion and an outer circumferential portion of the hub.

Abstract: A clutch cover includes a pressure plate enclosed by a cover core and a strap having one end securely fastened to the cover core by a first rivet and an opposite end securely fastened to the pressure plate by a second rivet. A rivet hole in the one end of the strap for receiving the first rivet and a rivet hole in the other end for receiving the second rivet have the same diameter. The cover core is provided with a first rivet hole for receiving the first rivet and with a caulking tool access hole at a position corresponding to the second rivet, the first rivet hole and the caulking tool access hole being of equal diameter, which is greater than the diameter of the rivet holes in the strap.