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AssigneeVisteon Global Technologies, Inc.
InventorsSteven Thomas Nissen, Brian Stanley Modrzejewski, Shawn Patrick Cap'ser
Estimating the term…
An auxiliary solenoid controlled variable displacement power steering pump, hydraulic systems incorporating same, and method for improving the efficiency of variable displacement power steering pumps. In one embodiment, a rotor is arranged within a pump body, and a cam fitted on an outer periphery of the rotor and movably arranged within the pump body to form a variable volume pump chamber. The cam is biased towards a position within the pump body to create maximum displacement. A mechanism is provided for forcing the cam into a position of fixed minimum or reduced displacement under certain conditions, such as low engine speed and power steering demand. In a preferred embodiment, the mechanism comprises a solenoid driven connecting rod that is operatively connected to the cam. Activation of the solenoid forces the cam to a position of fixed minimum or reduced displacement.
A variable displacement pump having a fixed displacement mode, comprising:
A hydraulic system, comprising an output driven mechanism, and a variable displacement pump having a fixed displacement mode and a variable displacement mode, said pump comprising a rotor having vanes, a pump body, and a cam, said rotor being rotatably arranged within said pump body, said cam fitted on an outer periphery of said rotor and movably arranged within said pump body to form a variable displacement pump chamber, said cam being biased in a direction to increase said pump chamber displacement, and a mechanism for selectively adjusting the position of said cam counter to the direction in which said ring is biased within said pump body in order to selectively provide a fixed displacement for said pump.
Dependencies are inferred from the claim text.