| 摘要 |
<P>PROBLEM TO BE SOLVED: To pull out a drive roll portion from a drive shaft portion in the axial direction by rotating a penetration shaft about the axis. <P>SOLUTION: A tool 900 such as a socket wrench is fitted into a tip portion 336 of a pull-out side end portion 334 of a penetration shaft 330 to rotate the penetration shaft 330 and release fixation of a screw portion 316 of a drive shaft portion 310. By this release, the penetration shaft 330 moves in a pull-out direction F (the screw moves forward). In other words, regarding the penetration shaft 330, rotational displacement thereof around the axis is converted into linear displacement in the axial direction. By this, a pull-out side end face 338 pushes a bottom portion 351 of a first cap member 350 in the pull-out direction F. At this time, a pitch of the screw and a diameter W of a grip portion 902 for rotating the tool 900 are set so that linear displacement amount of the penetration shaft 330 becomes smaller than rotational displacement amount of the grip portion 902 of the tool 900, in order to exert large force on the penetration shaft 330 in the axial direction (pull-out direction F). <P>COPYRIGHT: (C)2013,JPO&INPIT |
