Patent ID: 7469879

Claim:
A throttle device comprising a throttle body with an air-intake passage, a throttle valve for controlling the opening of said air-intake passage, and a motor for driving said throttle valve; said throttle device further comprising: a motor casing, which is molded integrally together with said throttle body and houses a motor body of said motor; a motor guide, formed around a motor insertion opening of said motor casing and configured by plural guide projections having respective arc-shaped inner faces, to guide a motor mounting flange of the motor body on an output shaft side of said motor when said motor is inserted into said motor casing and to restrain said motor body in a radial direction of said motor body; and a portion, which is on a side opposite to the output shaft side of said motor body and provided with projections arranged in a circumferential direction of said motor body; wherein said projections are formed in a single piece together with said motor body or attached to said motor body; wherein a first inner diameter of said motor casing, from said motor insertion opening up to a predetermined point of a deep recess portion of said motor casing, is larger than an outer diameter of said motor body including said projections, and a second inner diameter of said motor casing, from said predetermined point up to an end opposite to said motor insertion opening, is smaller than said outer diameter of said motor body including said projections, so that an inner surface of said motor casing has a contact starting position, where said projections come into contact with said inner surface being pressed against said inner surface upon motor insertion into said motor casing, and a subsequent insertion area, where said motor is fully inserted up to a full motor insertion position while said projections are pressed against said inner surface of said second inner diameter; wherein said projections are deformed inwardly in a radial direction of said motor body by being pressed down by an inner surface of said motor casing when the motor is fully inserted so that said portion opposite to the output-shaft side in said motor body is held in its radial direction in said motor casing; wherein said motor is housed in said motor casing so as to keep a non-contact state between an outer surface of said motor body and, other than said projections, said inner surface of the motor casing; and wherein a distance between an end of said motor guide opposite to a direction of motor insertion and said contact starting position, at which said projections come into contact with said inner surface of said motor casing by being pressed against said inner surface, is larger than a distance between said contact starting position and an end face of said flange on a side facing to the direction of said motor insertion when said projections are in said contact starting position, so that said flange is guided by said motor guide before said projections reach said contact starting position at the time of motor full insertion.