Hydraulic power steering pump having wet type motor with open type magnet

Abstract

Disclosed is a hydraulic power steering pump including a wet type motor with an open type magnet, the hydraulic power steering pump including: a housing; a gear pump module supported at one side of the housing and pressurizing a fluid; and a motor module supported at the other side of the housing and providing driving force to the gear pump module, the motor module including a stator that is supported by the housing and receives electric current based on supplied power, and a rotor that includes a motor rotation shaft rotated by the stator and a permanent magnet generating magnetic force, and an outer side of the permanent magnet being supported by the motor rotation shaft to have an exposed portion exposed toward the stator.

What is claimed is: 
     
         1 . A hydraulic power steering pump comprising a wet type motor with an open type magnet, the hydraulic power steering pump comprising:
 a housing;   a gear pump module supported at one side of the housing and pressurizing a fluid; and   a motor module supported at the other side of the housing and providing driving force to the gear pump module, the motor module comprising a stator that is supported by the housing and receives electric current based on supplied power, and a rotor that comprises a motor rotation shaft rotated by the stator and a permanent magnet generating magnetic force, and   an outer side of the permanent magnet being supported by the motor rotation shaft to have an exposed portion exposed toward the stator.   
     
     
         2 . The hydraulic power steering pump according to  claim 1 , wherein the rotor is arranged within flow of a fluid. 
     
     
         3 . The hydraulic power steering pump according to  claim 1 , wherein the rotor comprises a yoke holder coupled to the motor rotation shaft, a yoke supported by the yoke holder, and the permanent magnets plurally arranged outside the yoke, and
 the yoke holder comprises a permanent magnet holder to support one end of each permanent magnet along a lengthwise direction of the motor rotation shaft.   
     
     
         4 . The hydraulic power steering pump according to  claim 3 , wherein the yoke holder comprises ribs that divide the yoke holder in a circumferential direction to separate the permanent magnets from each other if the permanent magnets are arranged in the circumferential direction of the yoke holder. 
     
     
         5 . The hydraulic power steering pump according to  claim 3 , further comprising a separation preventing cab member comprising a skirt surrounding the other end of the permanent magnet along the lengthwise direction of the motor rotation shaft so that each permanent magnet coupled to the yoke can be prevented from separation in the circumferential direction.