Patent ID: 7503309

Claim:
A throttle control apparatus comprising: a housing that defines a throttle duct therein; a rotator that has a rotation axis and a throttle valve fixed to the rotation axis, the rotation axis being rotatably supported by the housing so that the throttle valve rotates about the rotation axis between a full open angle at which the throttle valve fully opens the throttle duct and a full close angle at which the throttle valve fully closes the throttle duct; a torsional coil spring that is arranged to be generally coaxial with the rotation axis and is associated with the housing and the rotator to bias the throttle valve to a predetermined intermediate angle between the full open angle and the full close angle; and an actuator that rotationally actuates the rotator between the full open angle and the full close angle against a biasing force of the torsional coil spring, wherein the torsional coil spring has a first loading portion that applies a biasing force to the rotator to bias the throttle valve from the full open angle toward the intermediate angle, and a second loading portion that applies a biasing force to the rotator to bias the throttle valve from the full close angle to the intermediate angle, the rotator is provided with a spring force receiving portion that receives both the biasing forces applied by the first and second loading portions so that the first and second loading portions sandwich the spring force receiving portion therebetween, the second loading portion is one end portion of the torsional coil spring and is bent into a generally S-shape, an end part of the S-shape second loading portion contacts the spring force receiving portion while a remainder of the S-shape second loading portion is spaced from the spring force receiving portion, and the first loading portion contacts the spring force receiving portion so as to oppose said end part of the second loading portion in a circumferential direction.