Shiftable transmission

Details Shiftable transmission Shiftable transmission

2005-09-27

2005-09-27

Estremsky, Sherry (Department: 3681)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

C475S143000, C475S146000, C475S320000, C475S321000, C475S322000, C192S01800B, C192S048800, C192S048910, C192S083000, C192S083000, C192S083000

Reexamination Certificate

active

06949042

ABSTRACT:
A shiftable transmission in which at least two clutches (2, 7) actuated in closing direction by spring force and in opening direction by the exertion of pressure are arranged, wherein output of the transmission is stopped by unpressurized shifting of both actuation devices (9, 13) thereby closing both clutches (2, 7). When pressure is exerted upon the second actuation device (13), the actuation force of the first actuation device (9) is composed of a spring force of the first actuation device (9) and a hydraulic force from the pressurization of the second actuation device (13). The clutch belonging to the first actuation device can thus be impinged upon with different forces depending on whether or not the second actuation device is impinged upon with pressure.

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