Motor

Abstract

A motor capable of replacing a lubricant more easily is provided. A motor includes: a rotor supported by an output shaft-side bearing and an anti-output shaft-side bearing; a front housing that supports the output shaft-side bearing; a rear housing that supports the anti-output shaft-side bearing; a stator having both ends attached to the front housing and the rear housing, the stator surrounding the rotor; and a pair of pipelines which has an opening formed in a surface of the rotor close to the rear housing and which is provided inside the rotor, the pipelines communicating with at least one of the output shaft-side bearing and the anti-output shaft-side bearing and capable of circulating a lubricating liquid.

What is claimed is: 
     
       1. A motor comprising:
 a rotor supported by an output shaft-side bearing and an anti-output shaft-side bearing; 
 a front housing that supports the output shaft-side bearing; 
 a rear housing that supports the anti-output shaft-side bearing; 
 a stator having both ends attached to the front housing and the rear housing, the stator surrounding the rotor; and 
 a pair of pipelines which has an opening formed in a surface of the rotor close to the rear housing and which is provided inside the rotor, the pipelines which are disposed at positions symmetric about an axis of the rotor and communicating with at least one of the output shaft-side bearing and the anti-output shaft-side bearing and capable of circulating a lubricating liquid,
 wherein the output shaft-side bearing comprises: 
 an output shaft-side inner ring which can engage with the front end of the rotor; and 
 a pair of through-holes which pass from the inner circumferential surface of the output shaft-side inner ring to the outer circumferential surface, the pair of through-holes communicating with each of the pair of pipelines, 
 
 wherein one of the through-holes is disposed closer to the front end than an axial central position of the output shaft-side inner ring, and 
 the other through-hole is disposed closer to the rear end than the axial central position of the output shaft-side inner ring. 
 
     
     
       2. The motor according to  claim 1 , wherein
 the opening is formed in an end surface of the rotor close to the rear housing. 
 
     
     
       3. The motor according to  claim 2  further comprising:
 a lid which closes the opening of each of the pair of pipelines. 
 
     
     
       4. The motor according to  claim 1  further comprising:
 a lid which closes the opening of each of the pair of pipelines.