Method of manufacturing rotation sensor and structure of rotatio

Details Method of manufacturing rotation sensor and structure of rotatio Method of manufacturing rotation sensor and structure of rotatio

1994-08-08

1997-05-27

Ahmad, Nasser

Stock material or miscellaneous articles

Sheet including cover or casing

7351901, 324167, 324173, 324174, 324200, 384174, 384448, 428 75, 428 76, 428213, G01P 342

Patent

active

056330626

ABSTRACT:
A method of manufacturing a rotation sensor can effectively prevent a sensor element from moving during a resin molding process for forming a resin portion that covers the sensor element to provide excellent waterproofness and airtightness. During a first resin injection step, an end of a bobbin of the sensor element is fixed or held in place by a slide core. Thereafter the slide core is extracted and resin is again injected in a second injection step into a vacated portion that is formed by extraction of the slide core. In the finished rotation sensor, the resin completely surrounds and encloses the bobbin, except at an exposed end of a magnetic pole piece. A metal mounting bracket is embedded in the resin at a spacing away from the bobbin. The bobbin has a positioning cavity to receive the slide core during the molding. The resin covering an upper part of the bobbin is at least four times as thick as the resin covering the coil of the sensor element.

REFERENCES:
patent: 4804911 (1989-02-01), Saito
patent: 5032790 (1991-07-01), Johnson
patent: 5148105 (1992-09-01), Okada
patent: 5388916 (1995-02-01), Ohtsuki

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