Patent ID: 6039027
Filing Date: 2000-03-21
Classification: F02D,F05C

Abstract:
A throttle valve device comprising:a throttle body having a part of an intake air passageway;a throttle valve fixedly mounted on a valve shaft and rotatably disposed in the part of said intake air passageway;a driving device disposed to said throttle body to drive said throttle valve through said valve shaft;a reduction gear mechanism through which said driving device and said valve shaft are mechanically connected so as to transmit a driving force of said driving device to said valve shaft in a manner to accomplish a speed-reduction for a rotational movement of said driving device to be transmitted to said valve shaft;a cam lever incorporated with said reduction gear mechanism and having a cam surface which is configured to allow said throttle valve to rotate from a fully closed position to a fully opened position, said cam surface having a bent section which causes said throttle valve to take a partly opened position located between said fully closed and opened positions;a cam follower rotatably disposed to said throttle body and in contact with said cam surface of said cam lever;a biasing device for always biasing said cam follower onto said cam surface of said cam lever, said biasing device being able to force said cam follower onto said bent section of said cam surface so as to keep said throttle valve at the partly opened position when the driving force of said driving device is released.