Patent ID: 6962325

Claim:
An electronically controlled throttle apparatus comprising: a throttle valve supported by a throttle shaft for opening and closing an intake air passage formed in a throttle housing: a valve gear which is integrally provided with an opener member which is rotatably driven by an actuator thereby to open and close the throttle valve; and a coil spring having a first coil spring portion and a second coil spring portion integrated with each other, the first coil spring portion biasing the throttle valve through the opener member in such a direction that the throttle valve is returned from a fully open position to an intermediate position, and the second coil spring portion being wound in an opposite direction relative to the first spring portion and biasing the throttle valve through the opener member in such a direction that the throttle valve is returned from a fully closed position to the intermediate position, wherein the valve gear is integrally provided with a guide member, which holds an inside diameter side of a portion of the coil spring extending at least from a joint between the first spring portion and the second spring portion to an end of the second spring portion; and wherein a lubricant is provided at a predetermined part of an area of slidable contact between an inside circumferential surface of the second spring portion and an outside circumferential surface of the guide member or to a predetermined part of an area of slidable contact between the inside circumferential surface in proximity to the joint between the first spring portion and the second spring portion and the outside circumferential surface of the guide member for reducing sliding resistance in relative motion between the inside circumferential surface of the coil spring and the outside circumferential surface of the guide member.