Patent ID: 6375435
Filing Date: 2002-04-23
Classification: F01C,F04C

Abstract:
A variable displacement vane pump comprising:a) a pump housing having a cylindrical interior chamber defining a central axis through which a vertical centerline and a horizontal centerline extends; b) a cylindrical rotor member mounted for rotational movement within the interior chamber of the pump housing about an axis aligned with the central axis of the interior chamber, the rotor member having a central vane section including a plurality of circumferentially spaced apart radial vane slots formed therein, each vane slot supporting a corresponding vane element mounted for radial movement therein, each vane element having an outer tip surface; c) a cam member mounted for pivotal movement within the interior chamber of the pump housing about a fulcrum aligned with the vertical centerline of the interior chamber, the cam member defining a cam body having a circular bore extending therethrough for receiving the rotor member, the circular bore forming a cam chamber defining a cam surface making continuous contact with the outer tip surfaces of the vane elements during the rotation of the rotor member, the cam body having first and second lateral sealing lands formed thereon, the sealing lands being offset from the vertical centerline of the interior chamber and having arcuate sealing surfaces defining segments of a cam arc through which the cam member pivots relative to the rotor member; and d) means for adjusting the position of the cam member relative to the rotor member.