| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a bearing pre-load structure of a machine tool having a simple structure and applying uniform pressing force to a bearing. <P>SOLUTION: In a bearing mounting part 2b of an outer circumferential surface of a main shaft 2, a first end surface 2f is formed which abuts on one axial direction-end surface 11d of an inner ring 11 of a first ball bearing 10, a second end surface 2c is formed which is parallel to the first end surface 2f and is located by a prescribed dimension t in the axial direction away from the other axial direction-end surface 11c' of an inner ring 11' of a second ball bearing 10' and which is formed so as to step down toward an axis center. A flange member 17 is detachably attached closely to the second end surface 2c and a color member 19 having an axial direction-dimension slightly longer than the prescribed dimension t is interposed between a pressing surface 17a of the flange member 17 and the other end surface 11c' of the inner ring 11'. <P>COPYRIGHT: (C)2012,JPO&INPIT |
