| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a low cost and lightweight pre-load adjusting structure for a rolling bearing, which maintains a stable action by suppressing a change in mechanical precision. <P>SOLUTION: A direct drive motor 100 consists of: a cross roller bearing 14; a housing inner 22 supported by an inner ring 14a; a rotor 12 supported by an outer ring 14b made of a material having a thermal expansion coefficient higher than the cross roller bearing 14; and an outer ring retainer 28 for fixing the cross roller bearing 14 with pre-load applied thereto. An annular member 30 is interposed between the rotor 12 and outer ring 14b, which is formed of a material having a thermal expansion coefficient lower than the cross roller bearing 14. Only the outer peripheral surface of one split ring 15a of the outer ring 14b is brought into an intimate contact with the inner peripheral surface of the annular member 30 to be restrained. <P>COPYRIGHT: (C)2008,JPO&INPIT |
