PURPOSE: To feed a proper air volume at all times independently of types of engine by controlling the closing valve in a branch path connecting the inlet passage section and volute end section of said helical suction port in accordance with the magnitude of the exhaust pressure of an exhaust system.
CONSTITUTION: The inlet passage section A of a helical suction port 6 and the volute section B end section formed around a suction valve connected to the inlet passage section A are connected to each other by a branch section 14, which is opened or closed by a rotary valve 18. An actuator 26 is connected to the valve axis of the rotary valve 18 through an arm 22 and a rod 25, etc., and the diaphragm chamber 30 of the actuator 26 is coupled with an exhaust manifold 24 through a guide pipe 32. Accordingly, when the intake air volume is increased, for instance, and thereby the exhaust pressure exceeds a preset value determined by a spring 31, a diaphragm 27 is moved downward so as to open the rotary valve 18 through the rod 25 and the arm 22, etc.
MOTOSUGI KATSUHIKO
TAKIMOTO MASATAMI
YAMADA HARUO
MIZUNO KISABUROU
TERAMURA MITSUNORI
