Power plants – Pressure fluid source and motor – Servo-motor having externally operated control valve sets...
Patent
1979-12-04
1984-05-08
Walton, George L.
Power plants
Pressure fluid source and motor
Servo-motor having externally operated control valve sets...
60450, 60452, 123 4112, 137101, 236 35, F01P 716
Patent
active
044466978
ABSTRACT:
A vehicle engine accessory drive system is disclosed including a hydraulic fan motor (M) and a power steering gear mechanism (SG) in series flow relationship. The system includes a variable displacement power steering pump assembly (P) which is the sole source of fluid for the system, and includes a variable displacement pumping element (PE) and a displacement control valve (CV). The displacement control valve includes a pilot valve (35) which is responsive to the demand for cooling to vary the fluid pressure in a signal chamber (63). The displacement control valve is operable to communicate a control fluid pressure to a stroking cylinder (SC) to control the fluid delivery rate of the pumping element. At a first relatively lower temperature, the displacement control valve maintains the fluid delivery rate of the pumping element at Z, and at a second relatively higher temperature, to maintain the fluid delivery rate at X. Controlling the fluid flow rate out of the pumping element in response to demand for cooling results in a substantial savings of pump input horsepower, especially when the hydraulic fan motor is operating at the minimum fan speed.
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Eaton Corporation
Grace C. H.
Sajovec F. M.
Walton George L.
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