Hydraulic pressure control device of an automatic...

Details Hydraulic pressure control device of an automatic... Hydraulic pressure control device of an automatic...

2007-12-26

2011-11-29

Restifo, Jeffrey J (Department: 3618)

Motor vehicles

Power

Including traction motor of kind driven by noncompressible...

C477S127000, C477S130000, C475S133000

Reexamination Certificate

active

08066090

ABSTRACT:
A hydraulic control apparatus for an automatic transmission includes a forward travel engaging element, a reverse travel engaging element, a first signal electromagnetic valve, a first switching valve, and a second switching valve. The hydraulic control apparatus is structured so as to change the output state of the signal pressure of the first signal electromagnetic valve when changing from the reverse travel shift position and/or shift range to the non-travel shift position and/or shift range and when changing from the forward travel shift position and/or shift range to the non-travel shift position and/or shift range, and to enable quick draining of hydraulic pressure of the hydraulic servo of the reverse travel engaging element and hydraulic pressure of the hydraulic servo of the forward travel engaging element.

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