Motors: expansible chamber type – With correlated control of motive fluid and locking means – Common or interconnected valve means control motive fluid...
Patent
1980-08-18
1983-09-20
Schwadron, Martin P.
Motors: expansible chamber type
With correlated control of motive fluid and locking means
Common or interconnected valve means control motive fluid...
91420, 1375147, 254361, 254377, F15B 1526
Patent
active
044048912
ABSTRACT:
An improved brake valve for a hydraulically powered winch which has one flow path permitting the relatively unrestricted flow of hydraulic fluid through the valve when the winch is being used to raise a load and a second flow path in which the flow of fluid is controlled in response to the pressure of fluid at the motor inlet when the winch is being used to lower a load. Of particular significance are a fixed area orifice, an annular restrictive passageway and a variable area orifice which cooperate to distribute the pressure drop in the control circuit so as to reduce the sensitivity of the valve to pressure fluctuations in the hydraulic motor circuit. Also of significance are seals used on the spool and damper piston to retard the movement of the spool and to produce a desirable hysteresis effect in its response to pilot pressure.
REFERENCES:
patent: 3022040 (1962-02-01), Miller
patent: 3086551 (1963-04-01), Gordon
patent: 3485474 (1969-12-01), Baumann
patent: 4127144 (1978-11-01), Turner
patent: 4172582 (1979-10-01), Bobnar
patent: 4183375 (1980-01-01), Vick
patent: 4244275 (1981-01-01), Smilges
Bentley Rick J.
Turnquist Edwin W.
Klein Richard L.
Paccar Inc.
Schwadron Martin P.
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