| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ball bearing for a spindle body turning section of a machine tool, adapted to be compatible with machine tools with recent tendency of combination while keeping or improving functions of high accuracy (high rotational accuracy), high rigidity, low torque, and low heat generation. <P>SOLUTION: In the ball bearing for the spindle body turning section of the machine tool which is provided between a base and a spindle body and in which a plurality of balls is rotatably disposed between a raceway groove of an outer ring and a raceway groove of an inner ring, the machine tool having the base, the spindle body turnable with respect to the base and attached with a spindle for turning a tool, and a drive source for driving the spindle body, and having a rotation shaft of the spindle and a turning shaft of the spindle body different each other, the ball bearing has at least two single-row ball bearings, the cross-sectional area dimension ratio (B/H) between the cross-sectional width B in the axial direction and the cross-sectional height H in the radial direction of the single-row ball bearing is set to (B/H) <0.63, and the ball bearing is configured such that the spindle body and the drive source are positioned on both ends in the axial line direction of the ball bearing. <P>COPYRIGHT: (C)2013,JPO&INPIT |
