Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Control of differential planetary gearing
Reexamination Certificate
2005-06-02
2010-12-28
Estremsky, Sherry (Department: 3655)
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Control of differential planetary gearing
C475S150000
Reexamination Certificate
active
07857723
ABSTRACT:
A transaxle unit comprises a differential assembly having a differential mechanism, a power take-off unit and a torque-coupling device for selectively restricting differential rotation of a differential mechanism. The torque-coupling device includes a friction clutch assembly for selectively frictionally engaging and disengaging a differential case and one of output axle shafts and a hydraulic clutch actuator. The hydraulic clutch actuator includes a hydraulic pump and a variable pressure relief valve assembly fluidly communicating with the hydraulic pump to selectively control a hydraulic pressure generated by the hydraulic pump. The variable pressure relief valve assembly comprises a valve closure member, a valve seat complementary to the valve closure member and an electro-magnetic actuator for engaging the valve closure member and generating a variable electro-magnetic force urging selectively vary a release pressure of the pressure relief valve assembly based on a magnitude of an electric current supplied to the electro-magnetic actuator.
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Dana Automotive Systems Group LLC
Estremsky Sherry
Marshall & Melhorn LLC
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