Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage
Patent
1979-08-09
1981-06-30
Croyle, Carlton R.
Pumps
Condition responsive control of drive transmission or pump...
Adjustable cam or linkage
60445, 251 611, 251122, F04B 4900
Patent
active
042759978
ABSTRACT:
A fluid pressure system includes a source of water pressure 12, a first fluid motor 27 actuated by the pressurized water, a variable displacement hydraulic pump 11, and a second fluid motor 14 actuated by hydraulic fluid from the pump. The pump includes a control device 20 having a control chamber for changing the displacement of the pump. A proportional valve 17 is hydraulically connected to the control chamber for changing the pressure in the control chamber. The proportional valve includes a housing 34, 35 and a diaphragm 36 dividing the housing into first and second chambers 39 and 41. The first chamber is connected to the first fluid motor, and the second chamber is connected to the pump inlet. The pump control chamber is hydraulically connected to the second chamber through a variable orifice, and the size of the orifice is changed in response to the pressure in the first chamber and first fluid motor. By this arrangement, the variable displacement pump is controlled by the water pressure in the first fluid motor.
REFERENCES:
patent: 2338021 (1943-12-01), Bennett
patent: 2393172 (1946-01-01), Larreco
patent: 3067693 (1962-12-01), Lambeck
patent: 3282556 (1966-11-01), Hancook
patent: 3549281 (1970-12-01), Schink et al.
patent: 3659625 (1972-05-01), Coiner et al.
patent: 3716346 (1973-02-01), Greene
patent: 3748857 (1973-07-01), Heiser
patent: 3959969 (1976-06-01), Tittmann et al.
Houtman Paul K.
Kowalski Thomas A.
Whitmore Charles H.
Woodring Richard H.
Baker James A.
Croyle Carlton R.
Look Edward
Parker-Hannifin Corporation
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