Variable displacement pump and power steering apparatus using the variable displacement pump
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United States of America Patent
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Oct 15, 2013
Grant Date -
Aug 19, 2010
app pub date -
Nov 10, 2009
filing date -
Feb 17, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A variable displacement pump including a drive shaft, a cam ring eccentrically moveable with respect to an axis of the drive shaft, and a solenoid drivingly controlled on the basis of variation in electric current amount to be supplied to the solenoid which is controlled in accordance with an operating condition of a vehicle. The solenoid is configured such that a rate of change in the specific discharge amount relative to the electric current amount to be supplied to the solenoid under a condition that the specific discharge amount is smaller is reduced as compared to a rate of change in the specific discharge amount relative to the electric current amount to be supplied to the solenoid under a condition that the specific discharge amount is larger.
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