Rotational position sensor having axially central sensor unit
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United States of America Patent
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Mar 19, 2013
Grant Date -
Jan 27, 2011
app pub date -
Sep 29, 2010
filing date -
Mar 31, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A rotational position sensor includes a rotating body rotatably supported around a predetermined axis line by a bearing portion of a housing and a sensor unit having a movable sensor element arranged at the rotating body to detect a rotational angle position of the rotating body and a fixed sensor element arranged at the housing. The rotating body includes a tapered annular contact face defining a part of a virtual cone face with a vertex on the axis line and the bearing portion includes a tapered annular bearing face rotatably supporting the annular contact face on the virtual cone face. Accordingly, the rotating body is consistently located on the axis line 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.
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