Toyota Jidosha Kabushiki Kaisha

Aisin Aw Co., Ltd.

Nhk Spring Co., Ltd.

Yukitoshi Ogawa

Shigeo Tsuzuki

Hironobu Imaizumi

Akihiko Kita

Takayuki Ishikawa

Hiroyuki Nozaki

In a differential gear device including: a differential casing rotatable about an axis and having a pair of through-holes; a pinion shaft accommodated within the differential casing and extending through the through-holes; a pair of pinion gears fitted on an outer circumferential surface of the pinion shaft such that the pinion gears are rotatable relative to the pinion shaft; a pair of side gears meshing with the pinion gears; and a pair of pinion washers interposed between the differential casing and the respective pinion gears, each of the pinion washers has a retainer structure partially inserted through a gap formed between an inner circumferential surface of a corresponding one of the through-holes and the outer circumferential surface of the pinion shaft. The retainer structure is held in contact with a corresponding axial end face of the pinion shaft, to prevent axial movements of the pinion shaft.

Differential gear device

A coned disc spring is arranged between a second component and a third component provided inside a tubular first component and movable in an axial direction. The coned disc spring comprises a body having a circular dish shape, teeth closely fitting into spline grooves formed on an inner peripheral surface of the first component and projecting to a radial outer side on an outer periphery of the body, and a stress relaxation portion formed by notching a base of the tooth in an approximately circular arc shape in a direction at least one of a circumferential direction and a radial direction of the body.

Coned disc spring

A cushion plate is provided, for example, between a piston of a hydraulic servo and an adjacent friction plate in a frictional engagement element of an automatic transmission. The cushion plate is deflected by a pressing force of the piston to absorb an engagement shock. The cushion plate includes a main body portion formed into a belleville-spring shape, and a plurality of pawls that extend from the outer periphery of the main body for spline engagement with a member that is splined to, for example, the friction plate. A side wall of each pawl is formed with a curved recess extending circumferentially of the cushion plate and located adjacent the juncture (base) of the pawl at the outer periphery of the main body.

Cushion plate

Growing community of inventors

Ichinomiya, Japan

Yukitoshi Ogawa