Serviceable wheel speed sensor with magnet assisted retention

Details Serviceable wheel speed sensor with magnet assisted retention Serviceable wheel speed sensor with magnet assisted retention

1992-08-17

1994-03-22

Strecker, Gerard R.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

188181R, 384448, G01P 3488, F16C 3200, B60T 872

Patent

active

052968057

ABSTRACT:
A serviceable ABS wheel speed sensor uses the permanent magnet both to provide an efficient magnetic circuit and to provide part of the retention force that retains a stator subassembly and a sensor subassembly together. The stator subassembly is a plastic end cap that seals one end of the wheel bearing, and has an annular steel web molded into it. A permanent magnet is located behind the web. The sensor subassembly is a plastic plug that fits into the end cap, and has a sensor coil with a steel plate in front abuttable with the stator subassembly web. When the two are assembled, the web and plate are pulled and retained together by the magnet. The coil and magnet are also thereby located proximate to spinning exciter teeth on one of the bearing races to provide an efficient magnetic circuit and strong signal.

REFERENCES:
patent: 3473120 (1969-10-01), Ruof
patent: 3910386 (1975-10-01), Stigall et al.
patent: 3916234 (1975-10-01), Stigall et al.
patent: 4904936 (1990-02-01), Richmond
patent: 4988220 (1991-01-01), Christiansen et al.
patent: 5004358 (1991-04-01), Varvello et al.
patent: 5111098 (1992-05-01), Peck et al.
patent: 5140261 (1992-08-01), Seo et al.

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