Shift device of hydraulic control system for automatic transmiss

Details Shift device of hydraulic control system for automatic transmiss Shift device of hydraulic control system for automatic transmiss

1982-02-24

1984-10-02

Hermann, Allan D.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74867, 74730, B60K 4106, B60K 4114, F16H 4700

Patent

active

044740840

ABSTRACT:
A hydraulic control system comprises first and second shift valves which cooperate with each other to effect a shift between two gear ratios. The first shift valve has a port and two different pressure acting areas which are exposed to pressure from the port depending upon downshift and upshift states of the first shift valve, respectively. The second shift valve effects communication between signal pressure generating means and the port of the first shift valve when the second shift valve is in one of two states to deliver the signal pressure to the port of the first shift valve.

REFERENCES:
patent: 3667323 (1972-06-01), Irie
patent: 4126154 (1978-11-01), McQuinn
patent: 4290325 (1981-09-01), Nishimura
patent: 4309919 (1982-01-01), Iwanaga et al.

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