Method for manufacturing hub ring and method for manufacturing vehicle bearing apparatus

Abstract

A method for manufacturing a vehicle bearing apparatus includes a method for manufacturing a hub ring. The hub ring includes a seal facing surface, a flange portion, and a shaft body portion. The flange portion includes a thin portion, a thick portion, bolt holes, a thin portion outer surface, a thick portion outer surface, and bolts. The flange portion protrudes outward from the shaft body portion. The thick portion is formed on an outer side with respect to the bolt holes in the flange portion, and the thin portion is formed on an inner side with respect to the thick portion in the flange portion. In the method for manufacturing the hub ring, machining is performed on the thick portion outer surface by using the seal facing surface subjected to grinding, as a reference surface, after the bolts are fitted into the flange portion.

1 . A method for manufacturing a hub ring, the hub ring including a flange portion and a shaft body portion, the flange portion including bolt holes, an outer surface, and bolts and being formed on an outer periphery of the shaft body portion, the bolts being press-fitted into the bolt holes, respectively, and the outer surface forming a surface of the flange portion on a vehicle outer side in an axle direction, the method by comprising: press-fitting the bolts into the bolt holes, respectively;
 forming a reference surface in the shaft body portion by performing grinding on the shaft body portion, the reference surface being orthogonal to or parallel to the axle direction; and   performing machining on the outer surface by using the reference surface as a reference, after the bolts are press-fitted into the bolt holes, respectively.   
     
     
         2 . The method according to  claim 1 , wherein the hub ring manufactured by the method for manufacturing the hub ring has a diameter changing surface whose outside diameter is reduced on a vehicle body side with respect to the flange portion in the axle direction, and the reference surface orthogonal to the axle direction is formed by performing grinding on the diameter changing surface. 
     
     
         3 . The method according to  claim 1 , wherein the flange portion has a thick portion and a thin portion, the outer surface has a thick portion outer surface and a thin portion outer surface, the thick portion is formed in a portion of the flange portion, which is located on an outer side with respect to the bolt holes, the thin portion is formed in a portion of the flange portion, which is located on an inner side with respect to the thick portion, a thickness of the thin portion in the axle direction is smaller than that of the thick portion, the thick portion outer surface forms a surface of the thick portion on the vehicle outer side in the axle direction, the thin portion outer surface forms a surface of the thin portion on the vehicle outer side in the axle direction, and machining is performed on the thick portion outer surface by using the reference surface as the reference, after the bolts are press-fitted into the bolt holes, respectively. 
     
     
         4 . A method for manufacturing a vehicle bearing apparatus, the vehicle bearing apparatus including a hub ring, an inner ring body, an outer ring member, rolling elements, and a seal member, the hub ring including a flange portion, a shaft body portion, a step surface, and a seal facing surface, the flange portion including bolt holes, an outer surface, and bolts and being formed on an outer periphery of the shaft body portion, and the outer surface forming a surface of the flange portion on a vehicle outer side in an axle direction, the method comprising:
 press-fitting the bolts into the bolt holes, respectively;   forming a reference surface in the shaft body portion by performing grinding on the seal facing surface or the step surface, the reference surface being orthogonal to the axle direction;   performing machining on the outer surface by using the reference surface as a reference after the bolts are press-fitted into the bolt holes, respectively; and   disposing the inner ring body so that the inner ring body abuts on the step surface of the manufactured hub ring in the axle direction, disposing the seal member in a portion facing the seal facing surface, and disposing the rolling elements and the outer ring member around an outer periphery of the inner ring body and the shaft body portion.   
     
     
         5 . The method according to  claim 2 , wherein the flange portion has a thick portion and a thin portion, the outer surface has a thick portion outer surface and a thin portion outer surface, the thick portion is formed in a portion of the flange portion, which is located on an outer side with respect to the bolt holes, the thin portion is formed in a portion of the flange portion, which is located on an inner side with respect to the thick portion, a thickness of the thin portion in the axle direction is smaller than that of the thick portion, the thick portion outer surface forms a surface of the thick portion on the vehicle outer side in the axle direction, the thin portion outer surface forms a surface of the thin portion on the vehicle outer side in the axle direction, and machining is performed on the thick portion outer surface by using the reference surface as the reference, after the bolts are press-fitted into the bolt holes, respectively.