Patent ID: 7124736

Claim:
An idling opening degree control apparatus in an intake air control apparatus in which an intake passage provided through in a control main body is opened and closed by a throttle valve attached to a throttle valve shaft rotatably pivoted to the control main body, comprising: a throttle valve lever ( 4 ) firmly fixed to a throttle valve shaft ( 3 ) and synchronously rotating with the throttle valve shaft ( 3 ); a loosely fitted lever ( 8 ) rotatably arranged in the throttle valve shaft ( 3 ) in a loose fit manner; a throttle valve operating drum ( 11 ) rotatably supported to a drum shaft ( 10 ) and operated so as to be opened and closed by a driver; and a cam lever ( 7 ) rotatably pivoted to a cam shaft ( 6 ) and rotating in correspondence to a movement in an axial direction of a lead screw type step motor (M), wherein said throttle valve operating drum and the loosely fitted lever ( 8 ) are coupled via a link lever ( 13 ), wherein an operating arm portion ( 4 a ) formed in said throttle valve lever is arranged so as to face to an opposing gap (S) between a first locking portion ( 8 a 1 ) and a second locking portion ( 8 a 2 ) in a forked locking portion ( 8 a ) formed in the loosely fitted lever ( 8 ) and a cam surface ( 7 a ) of the cam lever ( 7 ) is arranged so as to face to a roller ( 4 b ) provided in the throttle valve lever ( 4 ), wherein the operating arm portion ( 4 a ) of the throttle valve lever ( 4 ) is moved within the opposing gap (S) between the first locking portion ( 8 a 1 ) and the second locking portion ( 8 a 2 ) in the forked locking portion ( 8 a ) by the cam lever ( 7 ), thereby keeping an idling opening degree or a first idling opening degree of the throttle valve, at a time of operating the reed screw type stepping motor (M), and wherein the throttle valve is opened by bringing the first locking portion ( 8 a 1 ) of the loosely fitted lever ( 8 ) into contact with the operating arm portion ( 4 a ) of the throttle valve lever ( 4 ), at a time of operating the throttle valve operating drum ( 11 ) in an opening direction.