Hydraulic control device for automatic transmission

Details Hydraulic control device for automatic transmission Hydraulic control device for automatic transmission

2011-08-09

2011-08-09

Ho, Ha D. (Department: 3655)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

C475S120000, C475S122000

Reexamination Certificate

active

07993231

ABSTRACT:
A hydraulic control device for an automatic transmission includes a first solenoid valve, a second solenoid valve, a third solenoid valve, a preliminary shift speed switching valve, and a hydraulic pressure supply switching valve. A second friction engagement element is engaged at high speed side shift speeds, a low speed that is one of low speed side shift speeds is achieved by engagement of a first friction engagement element and a third friction engagement element, and a high speed that is one of the high speed side shift speeds is achieved by engagement of a second friction engagement element and the third friction engagement element.

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