| 摘要 |
[Subject] The present invention provides a rotational position sensor capable of detecting a rotational angle position of a rotating body with high accuracy while achieving simplification, miniaturization and the like thereof. [Solution] The rotational position sensor includes a rotating body 40 rotatably supported around a predetermined axis line L by a bearing portion of a housing 10, 20 and a sensor unit 70 having a movable sensor element 71 arranged at the rotating body to detect a rotational angle position of the rotating body and a fixed sensor element 72 arranged at the housing. The rotating body 40 includes a tapered annular contact face 42a defining a part of a virtual cone face C with a vertex P on the axis line L and the bearing portion includes a tapered annular bearing face 32a rotatably supporting the annular contact face on the virtual cone face C. Accordingly, the rotating body is consistently located on the axis line L due to an automatic alignment effect. Therefore, the rotational angle position of the rotating body can be detected with high accuracy even with occurrence of aging variation such as wearing at a bearing area. |
