Method for manufacturing rotator with bearing

Abstract

A pulley includes a radial rolling bearing and a pulley main body which are integrated to each other by an insert molding method. Therefore, a metal insert member is not required between the resin pulley main body and the radial rolling bearing, thereby reducing production cost of the pulley. Further, an axial dimension of an outer ring of the radial rolling bearing is set larger than an axial dimension of an inner ring thereof, so that a contact area between the radial rolling bearing and the pulley main body is increased. Therefore, a connection strength between the radial rolling bearing and the pulley main body is increased, and a surface area of the radial rolling bearing is increased, thereby improving heat radiation performance of the radial rolling bearing.

1 - 11 . (Cancelled)  
   
   
       12 . A method for manufacturing a rotator, comprising: 
 arranging an outer ring of a bearing in a die at a predetermined position;    injecting a resin in the die to form a rotating member integrated to the outer ring, at a radial outside of the outer ring; and    attaching a bearing ball to the outer ring so that the bearing ball rolling-contacts an inner peripheral surface of the outer ring; and    attaching an inner ring to the bearing ball at a radial inside of the outer ring so that the bearing ball rolling-contacts the inner ring, wherein an axial dimension of the outer ring is made larger than an axial dimension of the inner ring.    
   
   
       13 . The method according to  claim 12 , further comprising 
 forming an uneven portion on an outer peripheral surface of the outer ring before the injecting.    
   
   
       14 . The method according to  claim 12 , wherein the outer ring and the inner ring are formed such that a wall thickness of the outer ring is larger than a wall thickness of the inner ring, in contacting portions of the outer ring and the inner ring, contacting the bearing ball.  
   
   
       15 . A method for manufacturing a rotator, comprising: 
 arranging at least an outer ring of a bearing in a die at a predetermined position, the outer ring having an outer peripheral surface, two axial ends contacting the die, and two chamfer surfaces connecting the outer peripheral surfaces and the axial ends;    injecting a resin in the die to form a rotating member integrated to the outer ring at a radial outside of the outer ring, wherein two projections of the rotating member, contacting the two chamfer surfaces, are formed in the injecting due to the two chamfer surfaces.    
   
   
       16 . The method according to  claim 15 , wherein the bearing is formed such that a bearing ball rolling-contacts the outer ring and an inner ring.  
   
   
       17 . The method according to  claim 15 , wherein all the bearing is placed in the die in the arranging.