| 摘要 |
PROBLEM TO BE SOLVED: To achieve a configuration capable of suppressing shear resistance of an oil film in a slide contact part between an outer peripheral surface of a cylindrical spacer 15b arranged between a pair of radial needle bearings and a peripheral surface of a counterpart side, and in a slide contact part of both end surfaces in an axial direction of the spacer 15b and a counterpart surface, without increasing agitation resistance of lubricant oil according to a shape change to acquire such an effect.SOLUTION: An oil film area in a slide contact part is made to be small by providing a pair of outer diameter side partial conical surface parts 19 and 19 on both end parts in an axial direction of an outer peripheral surface of a spacer 15b. Also, with respect to the spacer 15b, by not providing a through-hole and a recess opening on inner and outer both peripheral surfaces of the spacers, these inner and outer both peripheral surfaces can be made peripheral surfaces free from unevenness with respect to a circumferential direction respectively. |
