Transmission shift control valve having fluid pressure distribut

Details Transmission shift control valve having fluid pressure distribut Transmission shift control valve having fluid pressure distribut

1986-03-25

1988-02-23

Braun, Leslie

Machine element or mechanism

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

Preselected indexed position

74867, B60K 4106

Patent

active

047262613

ABSTRACT:
A hydraulic control system comprises a distributor valve including a valve body formed with a first port communicating with a pressure regulator and a second inlet port. The valve body is also formed with a plurality of outlet ports communicating with corresponding frictional elements, respectively. A solenoid operated relief valve is fluidly disposed between the pressure regulator and the second inlet port of the valve body. The distributor valve includes a rotary valve element operatively connected with a stepping motor. The rotary valve element is rotatably disposed within a bore of the valve body and has a plurality of angular positions for connecting the outlet ports to the first inlet port, second inlet port and drainage, selectively. The solenoid of the relief valve is of the proportioning type and is controlled by a control unit. The stepping motor is also controlled by the control unit.

REFERENCES:
patent: 3016769 (1962-01-01), Christenson et al.
patent: 3101012 (1963-08-01), Christenson et al.
patent: 3327554 (1967-06-01), Searles
patent: 3732753 (1973-05-01), Olsen et al.
patent: 4160392 (1979-07-01), Sunohara et al.
patent: 4326433 (1982-04-01), Black et al.
patent: 4338832 (1982-07-01), Pelligrino
patent: 4345489 (1982-08-01), Muller et al.
patent: 4563918 (1986-01-01), Sugano
patent: 4573375 (1986-03-01), Hamada et al.
patent: 4603603 (1986-08-01), Salmon
"Service Manual for Nissan Automatic Transmission L4N71B Type and E471B Type", pp. 37 and 38, Nov. 1982.

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