Patent ID: 7328507

Claim:
A substantially simultaneous forming method of a throttle apparatus, which is provided in an internal combustion engine, using same dies, the throttle apparatus including a substantially tubular throttle body and a substantially disc-shaped throttle valve having a rotation center substantially perpendicular to a central axis of the throttle body, the forming method of the throttle apparatus comprising: filling a filler, which is heated to be in a molten state, into a cavity of the dies to form the throttle body and the throttle valve, such that the throttle body rotatably receives the throttle valve that is rotated by a predetermined angle with respect to a full close position of the throttle valve in a filling process; and compressing the filler in the cavity of the dies in a direction of the central axis of the throttle body by a predetermined pressure in a compressing process, wherein the throttle valve is rotated by the predetermined angle with respect to the full close position of the throttle valve in the filling process such that the predetermined angle substantially corresponds to a full open position of the throttle valve, and the throttle valve includes a disc-shaped part having at least one of a groove, a substantially flat section and a substantially linear section, which is located in an axially end portion of the outer circumferential periphery of the disc-shaped part to be parallel to the central axis of the throttle body, to form a gap between said axial end portion of the outer circumferential periphery of the disc-shaped part and an inner periphery of said tubular throttle body.