Power steering pump

Details Power steering pump Power steering pump

F - Mech Eng,Light,Heat,Weapons

04

B

103/90

F04B 49/08 (2006.01) B62D 5/06 (2006.01) B62D 5/10 (2006.01) F04B 1/10 (2006.01) F04B 49/02 (2006.01) F04C 2/067 (2006.01) F04C 2/344 (2006.01) F04C 2/356 (2006.01) F04C 13/00 (2006.01) F04C 15/00 (2006.01)

Patent

CA 1177327

Abstract The disclosure relates to a cheek plate unloading slipper vane pump for supplying fluid to a system. A fluid passage in the cheek plate receives flow from the contracting pockets. The passage has a portion directing flow from the contracting pumping pockets radially inwardly of the cheek plate. A tubular member is fixedly attached to the cheek plate coaxially with the axis of relative rotation of the rotor, and the interior of the tubular member communicates with the portion of the fluid pa-sage directing flow radially inwardly. A housing member that defines a chamber in which the cam ring, rotor and cheek plate are located has a discharge orifice coaxial with the tubular member. A seal is provided between the tubular member and the housing member enabling the tubular member to move with the cheek plate relative to the housing member while maintaining the seal. A drop in the output flow rate is achieved by a variable control orifice which is in part defined by a tapered surface on the tubular member. As the cheek plate and tubular member move away from the cam and rotor, the tapered surface moves to decrease the size of the control orifice to thereby decrease the pressure acting on one end of a servo valve spool that controls pressure in the cheek plate cavity and reduce the output flow of the pump.

402453

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