Solenoid-operated selector valve

Details Solenoid-operated selector valve Solenoid-operated selector valve

1991-05-03

1992-05-26

Michalsky, Gerald A.

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

Condition responsive means for modifying working member...

91517, 13759617, 192 8713, 192 8718, 192109F, F15B 1307

Patent

active

051157225

ABSTRACT:
There is disclosed a solenoid-operated selector valve adapted for control of hydraulic clutches such as of a tractor. The selector valve has four ports and can assume two positions. The selector valve includes a spool having an axially extending hole. A piston and a sequence valve are held in this hole. The sequence valve can relieve the pressure. The hole is in communication with the outside of the spool via first through third radially extending holes. The pressure inside one cylinder port which is normally connected with the pump port is maintained constant even when the engaged clutch is being switched to the other. This pressure is not reduced down to zero until the pressure inside the other cylinder port reaches a predetermined pressure.

REFERENCES:
patent: 2502800 (1950-04-01), Resnick
patent: 3473566 (1969-10-01), Peppel
patent: 4172582 (1979-10-01), Bobnar
patent: 4597557 (1986-07-01), Krieger et al.
patent: 4667570 (1987-05-01), Jensen et al.

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