| 摘要 |
PURPOSE:To prevent an exhaust reflux rate from decreasing in time of high load running, by displacing a supporting body, which forcibly presses an elastic body in a suction pressure responsive type exhaust reflux control valve, in a direction toward where load reaction force decreases according to an increase in engine load. CONSTITUTION:A valve body 22 in an exhaust reflux control valve 20 is coupled with a diaphragm 32 belonging to a diaphragm device 30 via a rod 31 and responds to a controlling suction pressure to be led into a pressure chamber 36 while the diaphragm 32 moves up and down against the load reaction force of two coil springs 38A and 38B whereby the opening of the valve body 22 is controlled. The coil spring 38B being large in a spring constant is supported by a supporting body 39 which is coupled with a diaphragm 52 belonging to a diaphragm device 50 provided with a pressure chamber 56 where suction pressure is taken in. As a result, in time of high load running as the suction pressure comes small, the supporting body 39 is positioned at the upper end, thus the set load of the diaphragm device 30 is reduced. |
