Two-speed shift valve

Details Two-speed shift valve Two-speed shift valve

1984-03-28

1986-04-01

Garrett, Robert E.

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

With means for selectively changing the speed or force...

60425, 60427, 91436, 91420, 137101, 1375992, 137529, 254340, B66D 124, F15B 1120

Patent

active

045790442

ABSTRACT:
A two-speed, pilot-operated selector valve which directs hydraulic fluid to two motor elements with a common output shaft to obtain a high-torque, low-speed mode, or to one motor element, while recirculating the second element in a loop, to obtain a low-torque, high-speed mode. The spool has a built-in logic mechanism which, while shifting from one position to the other, prevents any momentary condition where a motor discharge port is blocked or a fluid path exists that bypasses both motor elements.

REFERENCES:
patent: 2616259 (1952-11-01), Quintilian
patent: 2618291 (1952-11-01), Vestre
patent: 3626975 (1971-12-01), Bobst
patent: 3765181 (1973-10-01), Lang et al.
patent: 3768263 (1973-10-01), Olson et al.
patent: 4142369 (1979-03-01), Mickelson
patent: 4338856 (1982-07-01), Smilges et al.
patent: 4404891 (1983-09-01), Turnquist et al.
patent: 4501291 (1985-02-01), Siegrist

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