Rotary hydraulic vane device having a shaf seal

Abstract

A hydraulic fluid pressure energy translating device of the sliding vane type comprising a cartridge including a cam ring including an internal contour, a rotor having a plurality vanes rotatable therewith and slidable relative thereto in slots in the rotor with one end of each vane engaging the internal contour. The cartridge includes a rotor and has an internal contour cooperating to define one or more pumping chambers between the periphery of the rotor and the cam contour through which the vanes pass carrying fluid from an inlet port to an outlet port. Two pressure chambers are formed for each vane and each vane has two surfaces one in each chamber, both being effective under pressure in the respective chambers to urge the vanes into engagement with the cam. The cartridge further includes support plates. One of the support plates supports an annular shaft seal that engages a shaft rotatably mounted in the housing and supporting the rotor such that when the cartridge is removed from the housing, the shaft seal is simultaneously removed. The housing further includes a simple pressure relief valve positioned to regulate pressure on the other end of the housing into an area of lower fluid pressure.