Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1995-01-30
1997-03-25
O'Shea, Sandra L.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
384448, G01P 3488, F16C 4104
Patent
active
056148224
ABSTRACT:
A rolling bearing unit has a rotational speed detection device which has a sensor having a yoke, a pair of permanent magnets, a coil, and a tone wheel. The tone wheel is made by press-forming a magnetic metal plate so as to form a cylindrical support base secured onto an end portion of the bearing unit. The tone wheel has a ring-shaped first detecting part which is bent radially outward from the inner rim of the cylindrical support base, and a cylindrical shaped second detecting part which extends axially from the outer peripheral rim of the first detecting part. The first and second detecting parts have a ferro-magnetic first portion and a non-magnetic second portion, and the yoke has opposite ends which are faced to the first and second portions. The permanent magnets have like poles faced toward each other so that magnetic fluxes flow alternately through the yoke corresponding to the rotation of the tone wheel.
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Mashio Akihiro
Morita Kouichi
Okada Takamichi
Sakamoto Junshi
NSK Ltd.
O'Shea Sandra L.
Phillips Roger C.
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