Patent ID: 6863259
Filing Date: 2005-03-08
Classification: F02D

Abstract:
1. 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, wherein the first coil spring portion is for 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 is wound in an opposite direction relative to the first spring portion and for 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, characterized in that the guide member includes a first guide member which is protruded in an axial direction from the surface portion of the valve gear, and a second guide member which partly covers an outside circumferential portion of the first guide member, and the second guide member is integrally formed with the first guide member and made of a material which allows reduction in sliding resistance in relative motion between the inside circumferential surface of the coil spring and the outside circumferential surface of the second guide member.