Throttle valve control device for an internal combustion engine

A throttle valve control device for a throttle valve which controls an amount of intake air of an internal combustion engine and is operated by an electric actuator, comprising:

• a movable member operatively associated with the throttle valve and arranged to transmit torque produced by the electric actuator;
• said movable member having a cylindrical portion with a diameter larger than an axial length thereof,
• a spring operatively arranged inside the cylindrical portion for energizing the throttle valve in a closing direction from a full open position, and
• a gear being formed on an outer periphery of the cylindrical portion such that an output of the electric actuator can be transmitted to open or close the throttle valve through said gear.

A motor-driven type throttle valve control device for an internal combustion engine, comprising:

• a throttle valve shaft;
• a default spring for energizing said throttle valve shaft in the opening direction between the position of said default stopper and the full close position;
• a return spring the force of which acts on the throttle valve shaft indepedently from said default spring, for energizing said throttle valve shaft in the closing direction between the position of the default stopper and the full open position;
• and
• a default stopper provided at a position opened from a close position whereby a force of said return spring is stopped from acting on said throttle shaft in the closing direction from said position.

A motor-driven type throttle valve control device for an internal combustion engine, comprising:

• a coupling member capable of rotating relatively to said throttle valve shaft;
• a default spring which is connected at one end thereof to said coupling member and at the other end thereof to a fixed member which supports said throttle valve shaft;
• a return spring which is connected at one end thereof to said coupling member and at the other end thereof to a rotatable member which is mounted on said throttle valve shaft;
• and
• an engagement element provided between said throttle valve shaft and said coupling member thereby causing the both to rotate together as engaged when said throttle valve shaft is rotated from said default open position to a full close position, whereby
• said default spring stores a restoring force to return said throttle valve shaft and coupling member from said full close position to said default open position when the throttle valve shaft is rotated from the default open position to said full close position, and whereby
• said return spring stores a restoring force to return said throttle valve shaft from a full open position to said default open position when the throttle valve shaft is rotated from the default open position to said full open position.

A motor-driven type throttle valve control device for an internal combustion engine, comprising:

• a throttle valve shaft;
• a coupling member capable of rotating relatively to said throttle valve shaft;
• a return spring which is connected at one end thereof to coupling member and at the other end thereof to a fixed member which supports said throttle valve shaft;
• a default spring which is connected at one end thereof to said coupling member and at the other end thereof to a rotatable member which is mounted on said throttle valve shaft;
• an engagement element provided between said throttle valve shaft and said coupling member for engaging said throttle valve shaft and said coupling member thereby urging the both to rotate together when throttle valve shaft is rotated from a default open position to an open position, whereby
• said default spring stores a restoring force to return said throttle valve shaft from a full close position to the default open position when said throttle valve shaft is rotated from the default open position to said full close position, and whereby
• said return spring stores a restoring force to return said throttle valve shaft and said coupling member from a full open position to the default open position when the throttle valve shaft is rotated from the default open position to said full open position.