| 摘要 |
<p>An idling return mechanism (16A; 16B; 16C) is provided with a throttle body (1) in addition to a return spring (30) and closes a throttle valve (4) to the idling degree of opening. The idling return mechanism (16A) comprises a toggle joint of a diaphragm utilizing a suction vacuum of an engine such as mainly a case (18), an operating member (13) and a lever (5). The case (18) is separated into a vacuum chamber (9) and an atmospheric chamber (20) by a diaphragm (11). The operating member (13) fixed to the diaphragm (11). The operating member (13) fixed to the diaphragm (11) comprises an operating rod (14) and an operating spring (15). The lever (5) fixed to the operating rod (14) is mounted on a throttle valve shaft (3). The idling return mechanism (16B; 16C) comprises an electromagnetic force member such as mainly an electromagnet means (23) or a solenoid valve (25). The idling return mechanism (16A; 16B; 16C) is capable of reliably closing the throttle valve (4) to the idling degree of opening even when the return spring (30) is broken or damaged and is adapted to be operated only when the engine is decelerated. </p> |
