| 摘要 |
In order to suppress anvil wear and to improve longevity, a steel ball (40) having greater hardness than a spindle (26) or an anvil (18) is provided on the anvil (18) side of the spindle (26), a needle roller (41) having greater hardness than the spindle (26) and anvil (18) is provided on the spindle (26) side of the anvil (18), and the spindle (26) and the anvil (18) are supported so as to be relatively rotatable as a result of a member contact part (CP) being provided between the steel ball (40) and the needle roller (41). As a result, difference in hardness between the steel ball (40) and the needle roller (41) is eliminated and axial force can be received as a result of the member contact part (CP) provided between the steel ball (40) and the needle roller (41). As a result, wear of the spindle (26) or the anvil (18) having lower hardness than the steel ball (40) or the needle roller (41) can be prevented. |
