| 摘要 |
PURPOSE:To improve the reliability and durability of the titled device by a method wherein a gate valve serving as an air control valve which is provided in a bypass passage bypassing a throttle valve in an air intake passage and which is opened at the time of heating the engine is supported eccentrically and is made rotatable through the operation of a thermally expansible body. CONSTITUTION:When the engine is started while it is cold, the thermally expansible body 44 is in its non-expanded condition so that the gate vavle 32 keeps a valve hole 31 opened to the full to thereby open the bypass passage and a large quantity of auxiliary air is supplied into the engine as it bypasses the throttle valve 13. Next, when the temperature of cooling water elevates gradually and the thermally expansible body 44 within a heat sensing section 45 of an actuator 40 expands, the gate valve 32 is rotated inthe counter-clockwise direction against a spring 35 through a movable wall 42 and a rod 43 and the surface area of opening of the valve hole 31 reduces gradually. Then afterwards, when the thermally expansible body 44 expands to an excessive degree even afte the gate valve 32 is closed to the full, the valve 32 which is supported eccentrically by a support shaft 33 is rotated against only the force of the spring 35 so that the excessive expansion of the body 44 is absorbed. |
