Shift valve arrangement of hydraulic transmission control system

Details Shift valve arrangement of hydraulic transmission control system Shift valve arrangement of hydraulic transmission control system

1979-02-06

1982-06-15

Braun, Leslie

Machine element or mechanism

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

Preselected indexed position

74868, B60K 4106, B60K 4110

Patent

active

043344429

ABSTRACT:
A shift valve arrangement for incorporation into a hydraulic control system of an automatic power transmission, comprising a shift valve including separate switching and control valve elements arranged and movable in series with each other, the control valve element havind different pressure acting areas to be acted upon by a fluid pressure when the control valve element is in upshift and downshift positions, respectively, under kickdown condition and a pressure acting area to provide an upshift pattern of the transmission for part-throttle conditions of the engine, and a downshift valve having pressure acting areas to provide a downshift pattern for the part-throttle conditions of the engine.

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patent: 3886820 (1975-06-01), Lentz
patent: 4006652 (1977-02-01), Murakami
patent: 4111072 (1978-09-01), Harmon et al.
patent: 4186627 (1980-02-01), Kuramochi

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