Patent ID: 6843112

Claim:
A throttle opening degree sensor sliding a brush fixed to a rotor rotating in connection with a displacement of a throttle valve on a resistance body and outputting an electric voltage signal in proportion to an opening degree of the throttle valve, characterized in that a casing ( 5 ) receiving the rotor ( 6 ) and the brush has a single mounting flange portion ( 5 B) extending toward a direction (C) orthogonal to a longitudinal axial line (B—B) of the rotor ( 6 ) in a right side surface ( 5 A) side thereof, a single mounting hole ( 5 C) extending parallel to the longitudinal axial line (B—B) of the rotor ( 6 ) is pierced in the mounting flange portion, a cylindrical guide tube portion ( 5 D) coaxial with the longitudinal axial line (B—B) of the rotor ( 6 ) is formed to protrude toward the right side (E) in the right side surface ( 5 A) of the casing ( 5 ), an annular seal ring ( 7 ) is arranged in an outer periphery of the guide tube portion ( 5 D), the right side surface ( 5 A) of the casing is arranged on a left side surface ( 1 B) of the throttle body ( 1 ), the guide tube portion (SF) is inserted into and arranged within a tube portion guide hole ( 1 C) formed coaxially with a throttle shaft ( 3 ) mounting the throttle valve ( 4 ), and the casing ( 5 ) is engaged by screwing with the throttle body ( 1 ) via the mounting hole ( 5 C) of the mounting flange portion ( 5 B).