Race member in hub unit and method of producing the same

Abstract

A race member in a hub unit for supporting a wheel. The race member includes a cylinder portion, a flange portion bend radially outward from the cylinder portion, and a continuous portion that integrally connects the cylinder portion with the flange portion. The race member is integrally formed by subjecting a metal plate to punching and cold plastic working. The continuous portion is larger in thickness than the metal plate.

1 . A method of producing a race member in a hub unit for supporting a wheel,: which comprises 
 a cylinder portion;    a flange portion extended radially outward from the cylinder portion; and    a continuous portion that integrally connects the cylinder portion with the flange portion, 
 the method comprising:  
 subjecting a metal plate to punching and clod plastic working to form the cylinder portion, the flange portion and the continuous portion integrally,  
 wherein the continuous portion is larger in thickness than the metal plate.  
   
   
   
       2 . A method of producing a race member in a hub unit for supporting a wheel, which comprises 
 a cylinder portion;    a flange portion extended radially outward from the cylinder portion; and    a continuous portion that integrally connects the cylinder portion with the flange portion; and    a second cylinder portion extending from a radial inner end of the flange portion so as to be integral with the race member,    wherein the second cylinder portion extends in an axial direction opposite to the cylinder portion, 
 the method comprising:  
 making a portion of the continuous portion plastically flow in a direction opposite to the cylinder portion in the axial direction to form the second cylinder portion.