Method for improving the efficiency of a variable...

Details Method for improving the efficiency of a variable... Method for improving the efficiency of a variable...

2005-07-05

2005-07-05

Koczo, Michael (Department: 3746)

Pumps

Processes

C417S220000, C418S030000

Reexamination Certificate

active

06913446

ABSTRACT:
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.

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