| 摘要 |
PURPOSE:To eliminate the necessity for a spring and to remarkably reduce a number of part items by comprising a magnetic material rotary shaft, non- magnetic material one-way clutch outer cylinder having an internal diametric part and roller retainers for holding needle rollers in equally arranged positions on the periphery of the rotary shaft. CONSTITUTION:In a one-way clutch outer cylinder 2 externally fitted around a rotary shaft 1, a material of non-magnetic substance such as ceramics or synthetic resin further with high wearing resistance is used, and an internal diametric part 2' of the outer cylinder 2 is molded or worked into a section in which angular parts of an equilateral triangle are mutually connected by a predetermined circular arc. On the periphery of the outer cylinder 2, key grooves 2'' for fixing the outer cylinder to a member of gear, pulley, etc. in the direction of rotation are provided. Needle rollers 3, in which a magnetic material metal is magnetized, are arranged in a space between the one-way clutch outer cylinder 2 and the rotary shaft 1. Roller retainers 4, made of syn thetic resin are constituted by holding the needle roller 3 almost at an equal angle on the rotary shaft 1 while simultaneously preventing the needle rollers 3 from falling off in the axial direction. |
