Hydraulic control apparatus for vehicular fluid-actuated...

Details Hydraulic control apparatus for vehicular fluid-actuated... Hydraulic control apparatus for vehicular fluid-actuated...

2007-02-12

2009-11-17

Leslie, Michael (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control means responsive to, or...

C060S337000

Reexamination Certificate

active

07617676

ABSTRACT:
A hydraulic control apparatus for a vehicular fluid-actuated power transmitting device provided with a lock-up clutch and an oil cooler, the lock-up clutch being operable between an engaged state and a released state according to a difference between pressures of a working fluid in an engaging fluid chamber and a releasing fluid chamber, the oil cooler being connected to a fluid passage communicating with the engaging and releasing fluid chambers, and operable to cool the working fluid, the hydraulic control apparatus including an oil cooler by-pass valve operable to permit the working fluid to by-pass the oil cooler, and a low-temperature by-pass device operable to open the oil cooler by-pass valve, for permitting the working fluid to by-passes the oil cooler, when a temperature of the working fluid is lower than a predetermined lower limit.

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