Bearing structure and electric compressor

Abstract

A bearing structure of the present disclosure includes a rotation shaft, a bearing that is attached in a housing to support the rotation shaft with respect to the housing and includes an inner race through which the rotation shaft is inserted and an outer race which includes an annular groove portion formed on an outer peripheral surface facing an inner wall surface of the housing, and an O-ring which is disposed on the groove portion of the outer race of the bearing, protrudes outward in a radial direction in relation to the outer peripheral surface, and comes into contact with the inner wall surface of the housing. A clearance is formed between the inner wall surface of the housing and the outer peripheral surface of the bearing. The clearance is larger than a radial displacement amount of the O-ring.

1 .- 3 . (canceled) 
     
     
         4 . A bearing structure for supporting a rotation shaft of a rotation body accommodated in a housing with respect to the housing, comprising:
 the rotation shaft;   a bearing that is attached in the housing to support the rotation shaft with respect to the housing and includes an inner race through which the rotation shaft is inserted and an outer race which includes an annular groove portion formed on an outer peripheral surface facing an inner wall surface of the housing; and   an O-ring which is disposed on the groove portion of the outer race of the bearing, protrudes outward in a radial direction in relation to the outer peripheral surface, and comes into contact with the inner wall surface of the housing,   wherein a clearance is formed between the inner wall surface of the housing and the outer peripheral surface of the bearing and the clearance is larger than a radial displacement amount of the O-ring.   
     
     
         5 . The bearing structure according to  claim 4 ,
 wherein the inner wall surface of the housing, the bearing, and the O-ring are configured such that a frictional force between the inner wall surface of the housing and the O-ring becomes larger than a rotational force of the rotation body.   
     
     
         6 . An electric compressor comprising:
 the housing;   a compressor impeller which is attached to an end portion of the rotation shaft and constitutes a part of the rotation body; and   the bearing structure according to  claim 4  for supporting the rotation shaft with respect to the housing.   
     
     
         7 . An electric compressor comprising:
 the housing;   a compressor impeller which is attached to an end portion of the rotation shaft and constitutes a part of the rotation body; and   the bearing structure according to claim  2  for supporting the rotation shaft with respect to the housing.