Patent ID: 6672769
Filing Date: 2004-01-06
Classification: B60B,F16C,Y10T

Abstract:
A bearing apparatus comprising:a hollow shaft including a bearing fitting region around a peripheral surface thereof; and a rolling bearing having an inner ring fitted around said bearing fitting region of said hollow shaft, a shaft end of said hollow shaft being bent outwardly in a diametrical direction, thereby being caulked on an outer end surface of said inner ring of said rolling bearing, said bearing fitting region including a hardened layer in a region thereof from a first position corresponding to an inner end surface of the inner ring of said rolling bearing to a second position before a position corresponding to an outer end surface of the inner ring of said roller bearing, said bearing fitting region further including a non-hardened layer in another region from said second position to the shaft end of said hollow shaft, and said second position, which corresponds to a caulked side end portion of said hardened layer, being defined based on the following relational expression (1): ((Aâˆ’Câˆ’D)Y/E)&lE;XAâˆ’C)â€ƒâ€ƒ(1) wherein A represents a width in the axial direction of said inner ring, C represents a chamfering length in the axial direction in the outer end surface of said inner ring, D represents a chamfering length in the axial direction in an inner end surface of said inner ring, E represents a thickness of said hollow shaft, X represents a distance from a position of said chamfering length D to the caulked side end portion of the hardened layer, and Y(