| 摘要 |
PURPOSE:To prevent abrasion of a sleeve, by making the sleeve at the inside of a spring plate for pressing a frictional clutch movable in the circumferential direction and employing a smoothly curved face in the border section between the inclined face sleeve and the pushing sideface. CONSTITUTION:A frictional clutch 3 being pressed by a spring plate 2 and a sleeve 6 are provided in a clutch case 1 and a steel ball 9 is engaged in a through-hole 9 at a boss section 7. The sleeve 6 is slidable in the circumferential direction and a smoothly curved face is employed in a border face 15 between an inclined face of sleeve 10 and a pushing sideface 11. Consequently, a local and axial abrasion groove is not formed in the sleeve through the contact with the steel ball, thereby the durability can be improved.
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