US 4,903,548 AGranted

Snap ring support device for an automatic transmission

AssigneeAisin Aw Co., Ltd.

InventorsYouichi Hayakawa, Chihiro Hosono, Masaaki Nishida

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Abstract

In an automatic transmission provided with an automatic transmission mechanism section with a planetary gear unit and a torque converter, a snap ring groove is defined by an annular flange section for a stator shaft and a pump cover, and the reaction from a return spring is borne in the annular flange section. A stator shaft, which bears the stator reaction of a torque converter, is engagingly secured in a center hole section of an oil pump assembly, an annular flange section projecting to the radially outer side is formed at one end of the stator shaft, the snap ring groove is defined from the annular flange section and an annular recessed section of the oil pump assembly to receive the snap ring, and a receiving member for the return spring of the hydraulic actuator is maintained by the snap ring installed in the snap ring groove. Consequently, the return spring, which applies the return force to the piston of the hydraulic actuator, has its reaction force borne at the annular flange section of the stator shaft through the receiving member and the snap ring.

Claims4

Dependent claims

A snap ring support device for use in an automatic transmission comprising:

an automatic transmission mechanism section including an input shaft, at least one planetary gear unit connected to the input shaft and having rotary elements, at least one clutch for connecting the rotary elements, and stop means for stopping the rotary elements of the planetary gear unit,
a torque converter adapted to transmit rotation of an engine output shaft to the input shaft and having a stator shaft situated in the center thereof,
an oil pump assembly situated between the torque converter and the automatic transmission mechanism section, said oil pump assembly having a boss section in the center thereof, an annular recessed section formed at the boss section, and at least one hydraulic actuator,
an annular flange section extending radially outwardly from one end of the stator shaft so that a snap ring groove is defined by the annular flange section of the stator shaft and the annular recessed section of the pump assembly, and
a snap ring installed in the snap ring groove adapted to support a receiving member for a return spring of the hydraulic actuator.

2 more elements

Dependencies are inferred from the claim text.