Patent ID: 8602749

Claim:
A variable displacement vane pump, comprising: a pump body; a drive shaft rotatably mounted in said pump body; a rotor driven by said drive shaft; a plurality of radially extending vanes slidably disposed in said rotor; a pivot disposed in said pump body; a slide pivotally disposed on said pivot and having a central axis eccentric to an axis of said rotor; a plurality of fluid chambers defined by said rotor, said plurality of radially extending vanes and said slide; and a resilient member pivotally engaged with said slide and acting on said slide to urge said slide in one direction, wherein the resilient member is adapted to pivot about a second pivot at the pump body upon pivoting of the slide against the resilient member, wherein the resilient member comprises a solenoid spring having a longitudinal axis and comprising a seat in pivotable engagement with the slide, and wherein the seat comprises a convex outer surface in slidable engagement with a concave surface positioned on the slide with the convex and concave surfaces always in contact with each other for all phases of operation of the pump.