Patent ID: 6135742
Filing Date: 2000-10-24
Classification: F04C

Abstract:
An eccentric-type vane pump comprising:a rotor connected to a rotor shaft, said rotor having a plurality of vanes which can move radially by rotation of the rotor, each of said plurality of vanes being embedded in one of a plurality of vane grooves which are recessed within a space in a peripheral direction of the rotor;a cylinder ring mounted eccentrically around the rotor and rotatable by frictional force produced by an abutting front end of the plurality of vanes;a pump chamber formed between the rotor and the cylinder ring;a cylinder body having a bearing between an outer surface of the cylinder ring and the cylinder body, the bearing being an oilless bearing having a back pressure groove formed therein;a front body connected to a first end of the cylinder body, the one end of the rotor shaft being supported on a recess formed on one side of the front body; anda rear body connected to a second end of the cylinder body, the rotor shaft extending through the rear body, said rear body having a vane oil distribution channel which supplies oil pressure exerting on the vanes and a cylinder oil distribution channel which supplies oil pressure exerting on the cylinder ring from a bearing therein.