OUTER RING PRESSING STRUCTURE OF BEARING AND SPINDLE DEVICE

To provide an outer ring pressing structure of a bearing for preventing the deformation of an outer ring raceway by equalizing a fastening margin, and elongating a life of the bearing.SOLUTION: An outer ring pressing structure of a bearing comprises a housing 5 having a fitment inner face for fitting an outer ring 9 of the bearing 6 thereto, and an outer ring pressing member 16 attached to the housing 5, and pressing an end face of the outer ring 9 in an axial direction. The housing 5 comprises a plurality of screw holes 18 formed at the end face in the axial direction with intervals in a peripheral direction, and the outer ring pressing member 16 comprises a circular disc-shaped outer ring pressing face 16a which tightly adheres to the end face of the outer ring 9, a plurality of penetration holes 21 formed outside the outer ring pressing face 16 in a radial direction, and making bolts 22 to be fastened penetrate the screw holes 18, and a stiffness reduction part 23 arranged between the outer ring pressing face 16a and the penetration holes 21, and locally reducing the stiffness of the outer ring pressing member 16.SELECTED DRAWING: Figure 1 【課題】締め代を均一にして、外輪軌道の変形を防止し、軸受の寿命を増大させる軸受の外輪押さ構造を提供する。【解決手段】軸受６の外輪９を嵌合させる嵌合内面を備えるハウジング５と、ハウジング５に取り付けられ、外輪９の端面を軸方向に押圧する外輪押え部材１６とを備え、ハウジング５が、軸方向の端面に、周方向に間隔をあけて配置された複数のネジ孔１８を備え、外輪押え部材１６が、外輪９の端面に密着させられる円環状の外輪押え面１６ａと、外輪押え面１６ａよりも径方向外方に配置され、各ネジ孔１８に締結されるボルト２２を貫通させる複数の貫通孔２１と、外輪押え面１６ａと各貫通孔２１との間に設けられ、外輪押え部材１６の剛性を局所的に低減する剛性低減部２３とを備える。【選択図】図１