Sealing structure in a control system bypass inlet.

摘要

A sealing structure in a control system bypass inlet in which a bypass (30) extending around a throttle valve (21) to open and close an intake passage (17a) in a throttle body (17 ) is connected to said intake passage (17a), and an actuator (39) for operating a bypass valve (35) for opening and closing said bypass (30) is connected to said bypass valve (35), wherein said bypass valve (35) is connected to an output shaft (39a) of said actuator (39) through a screw mechanism (40), and said seal structure includes an annular seal (57) element which is arranged between a valve hole (34) in which said bypass valve (35) is received axially movably by the rotation of said output shaft (39a) and an actuator housing (42) 10 wherein said actuator ( 39) is mounted so that said element s ellado (57) is in close contact by an inner peripheral lip (61) with an outer peripheral surface of a root of said output shaft (39a) of said actuator (39) for rotation relative to one another, while maintaining where air tightness between said valve bore (34) and said actuator housing (42).