Hydraulic actuator in automatic transmission

Details Hydraulic actuator in automatic transmission Hydraulic actuator in automatic transmission

1991-12-17

1993-08-03

Herrmann, Allan D.

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

475281, 475283, 475330, 192 85AA, 192 488, F16D 5710

Patent

active

052324184

ABSTRACT:
A double-acting hydraulic actuator structure for use in an automatic transmission has a two-layered structure which includes first and second frictional engagement element hydraulic actuators. The first hydraulic actuator includes a drum member and a first piston fitted hermetically and slidably in the drum member. The second hydraulic actuator is formed by the interior of the first piston and a second piston fitted hermetically and slidably mounted within the first piston. The first and second pistons are both urged toward their disengaged positions by the action of a common return spring. A second spring is provided for urging the second piston alone against the force of the return spring.

REFERENCES:
patent: 4716787 (1988-01-01), Miura et al.
patent: 4732253 (1988-03-01), Hiramatsu et al.
patent: 4971185 (1990-11-01), Hayakawa et al.
patent: 5029685 (1991-07-01), Takase et al.

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