Throttle device for internal combustion engine

A throttle device for an internal combustion engine including a motor which drives a throttle shaft for performing an open and close control of a throttle valve, a fully closed position setting mechanism for setting a fully closed position of the throttle valve, and an initial opening degree setting mechanism which keeps an initial opening degree of the throttle valve larger than that of the fully closed position when no current is supplied to the motor, wherein said initial opening degree setting mechanism comprising, as the elements thereof, a throttle lever, a return lever, a first urging device, a second urging device, a first sleeve and a second sleeve, and the throttle lever and the first sleeve are arranged in an end of the throttle shaft and secured thereat via a clamping force in an axial direction of a nut, the second sleeve being integrated with the return lever is fitted to the first sleeve so as to permit a relative rotational movement and further urged by the first urging device to the position of the initial opening degree in the direction of closing the throttle valve, through the urging force the return lever is caused to be engageable with the throttle lever, and the throttle shaft has a throttle valve opening force applied thereto by the second urging device so as to keep the initial opening degree of the throttle valve near the fully closed position.

A throttle device for an internal combustion engine which includes a motor used as an actuator for driving a throttle valve, a return spring which urges the throttle valve in the direction of closing the same and, when the motor is turned off, causes to return the throttle valve to a position of an initial opening degree thereof which is larger than that of a fully closed position thereof, and a spring used for determining the initial opening degree which, when the motor is turned off, urges the throttle valve in the direction of opening the same near the fully closed position thereof so as to keep the initial opening degree thereof, wherein, on a throttle shaft for the throttle valve, a spring holder divided into two parts in the axial direction of the throttle shaft is disposed and provided with two spring receiving spaces one being inside and the other being outside by partitioning the same and with a plurality of cut-outs which permit the ends of the respective springs received in respective partitioned spaces to be led out from the spring holder so as to connect with predetermined members, whereby one of the return spring and the spring used for determining the initial opening degree is received in the outside space of the spring holder and the other is received in the inside space of the spring holder.

A throttle device for an internal combustion engine which includes a motor used as an actuator in a throttle control system, a fully closed position setting mechanism for setting a fully closed position of a throttle valve, and an initial opening degree setting mechanism which keeps an initial opening degree of the throttle valve larger than that of the fully closed position when no current is supplied to the motor, wherein a reduction gear mechanism used for amplifying the driving force of the motor is disposed at one end of a throttle shaft for the throttle valve passing through a throttle body, a screw used for adjusting an opening degree for an idling operation which is used as a stopper in the fully closed position setting mechanism is disposed on a side wall of the throttle body at the side where the reduction gear mechanism is disposed and another screw used for adjusting the initial opening degree which is used as a stopper in the initial opening degree setting mechanism is also disposed on a side wall of the throttle body.

A throttle device for an internal combustion engine which includes a motor used as an actuator in a throttle control system, a fully closed position setting mechanism for setting a fully closed position of a throttle valve, and an initial opening degree setting mechanism which keeps an initial opening degree of the throttle valve larger than that of the fully closed position when no current is supplied to the motor, wherein a reduction gear mechanism of the motor which drives a throttle shaft for the throttle valve is disposed at one of the side walls of a throttle body for the throttle valve, a casing portion is formed at the opposite side wall of the one side wall of the throttle body, an end of the throttle shaft and an acceleration shaft interlocked with an acceleration pedal are introduced into the casing portion, a throttle position sensor, acceleration pedal position sensor and the initial opening degree setting mechanism are installed within the casing portion, and a member supporting the acceleration shaft and acceleration pedal position sensor constitutes as a cover of the casing portion.