| 摘要 |
PURPOSE:To prevent deterioration of transmission efficiency and rattling of transmission system even upon abrasion of drum by maintaining the pushing force of frictional board at the movable side constant at any time. CONSTITUTION:A clutch arm 8 is secured to one end of shift pin 7 journaled to the gear case 9 while secured with a shift arm 4, and a link arm 10 is journaled rotatably to the clutch arm 8. The extended end of clutch arm 8 is forked and faced with a screen board 10a of link arm 10 while a pair of coil springs 17 are mounted on the link arm 10 and a roller 15 contactable with the forward and reverse function cams 16 is journaled to the roller arm 13. When any one of cam arm 20 rotatable through a lever 21 is operating, the friction board 6 at the movable side of frictional clutch (a) is pressure contacted through a coil spring 17 at that side against the frictional board 5 at the fixed side thus to maintain the pushing force of frictional board constant. |
