Throttle device for internal-combustion engine

A throttle device driven by an electric actuator to open and close a throttle valve to control the amount of intake air aspirated by an internal-combustion engine, having a default opening setting mechanism to hold the amount of opening of the throttle valve at a specific opening (hereinafter referred to as the default opening) which is larger than the full-close position when the electric actuator is off, said throttle device for an internal-combustion engine in which a stopper for defining said default opening position and a stopper for defining a mechanically full-closed position of said throttle valve are comprised of adjusting screws so juxtaposed as to enable adjustments of their position in the same direction.

A throttle device for an internal-combustion engine which is driven by an electric actuator to open and close a throttle valve for controlling the amount of intake air aspirated by the internal-combustion engine, said throttle device having a default opening setting mechanism for keeping a wider default opening than the full-closed position of said throttle valve when said electric actuator is off;

• in said throttle device, on one end of said throttle valve shaft, said final gear of said reduction gear is fixed to transmit the power of said electric actuator, and said engagement element (hereinafter referred to as said default lever) of said default opening setting mechanism is fitted rotatably in relation to said throttle valve shaft;
• between said default lever and said final gear, there is disposed a spring for setting said default opening (hereinafter referred to as said default spring) which attracts towards mutual engagement of said default lever and said final gear;
• and said default spring is of a spring stopper structure for directly stopping said default lever and said final gear.

A throttle device for an internal-combustion engine which is driven by an electric actuator to open and close a throttle valve for controlling the amount of intake air aspirated by the internal-combustion engine, said throttle device having a default opening setting mechanism for keeping a wider default opening than the full-closed position of said throttle valve when said electric actuator is off;

• in said throttle device, a reduction gear for transmitting to said throttle valve shaft the power of said electric actuator is provided;
• said final gear of said reduction gear is fixed by pressing on one end side of said throttle valve shaft protruding from the side wall of said throttle body;
• and said press-to-fix type final gear is driven by said electric actuator to enable contact with said stopper which defines said mechanically full-closed position of said throttle valve.

A throttle device for an internal-combustion engine which is driven by an electric actuator to open and close a throttle valve for controlling the amount of intake air aspirated by the internal-combustion engine;

• in said throttle device, a motor used as said electric actuator has two opposite flat surfaces in a yoke forming said motor housing;
• said motor casing for housing said motor has opposite flat inner surfaces conforming to the contour of said motor housing, and is disposed on the side wall of said throttle body in such a manner as to meet the line orthogonal to the axis of said throttle valve shaft;
• and, of said opposite flat inner surfaces of said motor casing, all or most part of one inner surface forms the outside wall surface of said intake air passage located downstream of said idle opening position for throttle valve control.

A throttle device for an internal-combustion engine which is driven by an electric actuator to open and close a throttle valve for controlling the amount of intake air aspirated by the internal-combustion engine;

• in said throttle device, a motor used as said electric actuator has two opposite flat surfaces in a yoke forming a motor housing;
• said motor casing for housing said motor has opposite flat inner surfaces conforming to the contour of said motor housing, and is disposed on the side wall of said throttle body in such a manner as to meet the line orthogonal to the axis of said throttle valve shaft;
• and, of said opposite flat inner surfaces of said motor casing, one inner surface is recessed lower than the surrounding outside wall surface of said intake air passage.