Hydraulic control apparatus for automatic transmission

Details Hydraulic control apparatus for automatic transmission Hydraulic control apparatus for automatic transmission

2007-02-13

2007-02-13

Wright, Dirk (Department: 3681)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

Reexamination Certificate

active

11075876

ABSTRACT:
A hydraulic control apparatus for an automatic transmission includes a first SL linear solenoid, a second SL linear solenoid, a third SL linear solenoid, and a fourth SL linear solenoid, which are normal closed type, and a sequence valve. The sequence valve connects the first SL linear solenoid to a servo of a C1 clutch, the second SL linear solenoid to a servo of a C2 clutch, and the fourth SL linear solenoid to a servo of a B3 brake at normal time. The sequence valve selectively connects a D range oil passage to the servo of the C1 clutch and the servo of the C2 clutch, and connects the D range oil passage to the servo of the B3 brake, when an electric failure gas occurred.

REFERENCES:
patent: 6398684 (2002-06-01), Kaizu
patent: 6432015 (2002-08-01), Takahashi
patent: 6929584 (2005-08-01), Miyata et al.
patent: 6966862 (2005-11-01), Inuta
patent: 2000-240776 (2000-09-01), None
patent: 2001-248718 (2001-09-01), None

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