Patent ID: 6454245
Filing Date: 2002-09-24
Classification: F02M

Abstract:
An engine intake control mechanism comprising:a throttle valve and a choke valve which are positioned in an intake passageway of an air/fuel mixing device adapted to be mounted on an internal combustion engine; a first throttle control lever coupled for rotation with a rotatable shaft of the throttle valve; a second throttle control lever, which is rotatable about an axis of the rotatable shaft of the throttle valve; a throttle return spring urging the throttle valve to rotate in the closing direction thereof; a coupling spring linking the first throttle control lever to the second throttle control lever to enable the first throttle control lever and the second throttle control lever to rotate together; a choke control unit coupled for rotation with a rotatable shaft of the choke valve; and a choke return spring urging the choke valve to rotate in the opening direction thereof, wherein the choke control unit is arranged such that when the choke control unit is rotated together with the choke valve so as to move the choke valve into a cold-starting position, the first throttle control lever together with the throttle valve and the second throttle control lever are caused to rotate in response to the rotation of the choke control unit so as to position the throttle control valve in a cold-starting position, the choke control unit and the first throttle control lever are interlocked with each other so as to retain the cold-starting positions thereof against the biasing forces of the choke return spring and of the throttle return spring, and when the first throttle control lever is further rotated from the interlocked state in a direction to increase the opening degree of the throttle valve, the first throttle control lever is disengaged from the choke control unit and at the same time the choke control unit is engaged with the second throttle control lever, thereby interlocking the choke control unit with the second throttle control lever at the cold-starting position.