| 摘要 |
An electronically controlled throttle control apparatus comprises a throttle body (1) defining an interior intake duct, a throttle valve (3) accommodated in the intake duct, a power transmission device (5) having a rotator (9) for transmitting rotational power of an actuator (5) to the throttle valve (3) and rotationally driving said throttle valve (3) in a fully-open direction or a fully-closed direction, and a single coil spring (6). The coil spring (6) biases the throttle valve (3) in a fully-open direction or a fully-closed direction, having a first end locked by the throttle body (1) and a second end locked by the rotator (9). The coil spring (6) has a first spring part (61) having a return spring function of biasing the throttle valve (3) via the rotator (9) in a direction of returning from a fully-open position to an intermediate position, and a second spring part (62) having an opener spring function of biasing the throttle valve (3) via the rotator (9) in a direction of returning from a fully-closed position to the intermediate position. Further, the coil spring (6) is a single spring of coil form in which a coupling portion (63) between the first spring part (61) and the second spring part (62) is bent into a generally inverted U-shape to form a U-shaped hook part (63), and one axial end of the first spring part (61) and another axial end of the second spring part (62) are wound in different directions. The rotator (9) has an engaging part for detachably engaging with the U-shaped hook part (63), and a locking part for locking another end of the coil spring (6), the locking part being arranged in a circumferential direction of the engaging part.
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