| 摘要 |
PURPOSE: A vehicle speed sensor is provided, which prevents a sensing error due to external impacts with a simple configuration. CONSTITUTION: A rotation plate(2) is located in a case(52) and also is fixed to a spindle axis(50), and N and S pole(1) are placed in turn. And a hall device(54) is installed to sense the N and S pole by being installed adjacent to the external circumference. The spindle axis and the rotation plate are injection-molded in a body by a plastic injection molding, and an additional metal plate is combined to the outer circumference of the rotation plate. The hall device is installed on a circuit board, and detects a pole turn speed according to the rotation speed when the N and S pole are rotated, and then enables the pole turn speed. |
