| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a non-contact type rotational angle detection apparatus that reduces the number of parts required, improves productivity, and prevents a relative displacement between a permanent magnet and a yoke by molding pressure of resin. <P>SOLUTION: This non-contact type rotational angle detection apparatus includes an insert molded body 5 that is fixedly secured to a shaft 11 and is composed of a permanent magnet 8 and a yoke 9 formed integrally with each other by insert molding of resin, and a non-contact sensor 18 disposed in an inner space formed in the insert molded body 5. The non-contact sensor 18 detects a rotation angle of the shaft 11 by detecting an azimuth of magnetic flux lines generated by the permanent magnet 8. The cylindrical yoke 9 is fixedly secured by shrinkage fitting to the cylindrical permanent magnet 8 disposed at an inner side thereof. An engagement margin between the permanent magnet 8 and the yoke 9 is set equal to or greater than a value which restrains a relative displacement between the permanent magnet and the yoke by molding pressure of resin. <P>COPYRIGHT: (C)2009,JPO&INPIT |
