| 摘要 |
PURPOSE:To certainly prevent the seizure of a clutch during running even if a throttle cable is broken by forming a main cam surface and a sub-cam surface for increasing a throttle pressure higher than that in idling time on a throttle cam. CONSTITUTION:When a throttle cable 19 is broken by any cause, a throttle cam 17 is energized in full-close direction by the spring force of a return spring, but a roller 16 on the top end of a throttle plug 15 is brought into contact with a sub-cam surface 34 in an overstroke position over the full-close side. As the sub-cam surface 34 is set higher by a determined quantity in the idle corresponding position of a main cam surface 33 to increase the throttle pressure higher than that in idling time, the throttle pressure is set to a higher value than that in idling time. Consequently, a determined clutch fastening force set according to the height of the sub-cam surface 34 is obtained, so that the seizure of the clutch during running can be certainly prevented. |
