Hitachi Automotive Systems Steering, Ltd.

Naoki Takayanagi

Tatsuyoshi Maruyama

Kiyotaka Shirakubo

Osamu Yoshida

Kohtaro Shiino

A steering angle sensor for a vehicle including a steering angle sensor housing, a first gear, a rotation transmitting portion, a second gear meshing with the first gear, a third gear meshing with the first gear or the second gear, first and second magnetoresistance effect elements to detect first and second rotation angles as rotation angles of the second and third gears, respectively, and a biasing member disposed in the steering angle sensor housing to bias the first gear toward the second gear, wherein the first and rotation angles are combined to determine an absolute steering angle indicative of an amount of rotation of a steering wheel when the steering wheel is rotated from a neutral position in which a steerable road wheel is oriented to a straight ahead direction of the vehicle.

Steering angle sensor

A steering angle sensoris provided which can minimize a detection error even when a steering shaftis inclined. In an annular clearance tdefined between the steering shaftand an inner cylindrical wall of a first gear, there is compressed an elastic O-ring. Due to provision of the elastic O-ring, inclination of the steering shaft, which tends to occur during handling of a steering wheel, is suitably absorbed by the elastic O-ring, and thus, generation of detection error caused by inclination of the first gear, which would follow the inclination of the steering shaft, is suppressed or at least minimized.

Steering angle sensor and electric power steering device employing the same

A power steering system having a housing having first and second housing sections, a steering shaft rotatably housed in the housing, a sensor coil, a coil bobbin having a coil holding part and a flange part and housed in the first housing section, a first held section provided at the flange part, a sensor board housed in the housing, a second held section provided at the sensor board, first and second riveting portions provided at the first housing section, and an electric motor. The first riveting portion fixes the coil bobbin to the first housing section by melting and deforming the first riveting portion with the first held section touching the first riveting portion. The second riveting portion fixes the sensor board to the first housing section by melting and deforming the second riveting portion with the second held section touching the second riveting portion.

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Kawasaki, Japan

Naoki Takayanagi