Motors: expansible chamber type – With motive fluid valve – Pilot valve
Patent
1995-06-07
1996-10-29
Nguyen, Hoang
Motors: expansible chamber type
With motive fluid valve
Pilot valve
91459, 91462, 91454, F15B 1108, F15B 13044
Patent
active
055687598
ABSTRACT:
A three position four way directional control valve having a single spool is typically used for controlling fluid flow from a pump to a cylinder and from the motor to a tank. The present invention includes a pair of electrohydraulic control valves with one of the control valves controlling pump-to-cylinder communication between a pump and the rod end and head end chambers of a hydraulic cylinder while the other control valve controls cylinder-to-tank communication between the rod end and head end chambers and the tank. Each of the control valves includes a displacement controlled proportional valve for controlling the position of a pilot operated valve member. Actuation of the hydraulic cylinder requires moving the valve member of one control valve to control pump-to-cylinder communication to one of the chambers while simultaneously moving the valve member of the other control valve for establishing cylinder-to-tank communication between the other chamber and the tank.
REFERENCES:
patent: 886633 (1908-05-01), Platz
patent: 3164065 (1965-01-01), Frantz
patent: 3782250 (1974-01-01), Kiszewski
patent: 5095804 (1992-03-01), Burch
patent: 5138838 (1992-08-01), Crosser
patent: 5313873 (1994-05-01), Gall et al.
Caterpillar Inc.
Grant John W.
Nguyen Hoang
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