| 摘要 |
PROBLEM TO BE SOLVED: To lower the output of an actuator and to downsize the actuator by preventing the application of the pressure difference on both end faces of a bypass valve in an air-intake control device for an engine. SOLUTION: A cylindrical valve hole 34 communicating with an upstream side of a bypass 30 and a valve hole outlet 33o formed on an inner face of the valve hole 34 and communicating with a downstream side of the bypass 30 are formed on the way of the bypass 30 detouring a throttle valve 21, a piston-shaped bypass valve 35 for opening and closing the valve hole outlet 33o is slidably fitted to the valve hole 34, the bypass valve 35 is connected to a driving member 37 driven by the actuator 39 through an Oldham joint 50, and both axial end faces of the bypass valve 35 are allowed to communicate. |
