| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel that can perform printing at low cost even in a finished-product state, can improve identification performance and traceability, can prevent the incapability of visual confirmation, and is improved in reliability. <P>SOLUTION: In the bearing device for the wheel of first generation structure, the information of the bearing device for the wheel is printed to an inside-diameter chamfer 6c at the side of a large end face 6b of an inner ring 6 by the irradiation of a laser, the chamfer 6c of the inner ring 6 is formed by a machining process among processes of forging, machining, heat treatment and grinding, an oxide film is adhered to the surface of the device by heat treatment at a surface roughness of ≤Ra 6.3, and a black laser marking is printed after the oxide film being the back ground of a printing position is removed in advance. <P>COPYRIGHT: (C)2012,JPO&INPIT |
