| 主权项 |
1. A pulley unit comprising:
a sleeve having a cylindrical shape, and including: on one side in an axial direction a first opening end portion for insertion of an end portion of a rotational shaft; and a second opening end portion provided on a side that is opposite from the first opening end portion and having, as an inner periphery, a polygonal inner peripheral portion with a polygonal cross-section; a pulley that is concentrically arranged on a radially outer side of the sleeve to be supported rotatably about an axis and has an outer peripheral surface on which a belt is wound; and a cap member having a cover portion covering the second opening end portion and claw portions that are engaged with a stepped attaching portion provided on an inner surface of the sleeve, wherein the cap member has an annular portion extending from the cover portion in the axial direction and fitted into the polygonal inner peripheral portion, the claw portions are formed to extend from the annular portion in the axial direction, and a peripheral surface of the annular portion is provided with first plane portions facing a surface of the polygonal inner peripheral portion. |
