The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 25, 1997
Filed:
Jan. 30, 1995
Junshi Sakamoto, Yokohama, JP;
Kouichi Morita, Fujisawa, JP;
Takamichi Okada, Hannou, JP;
Akihiro Mashio, Hannou, JP;
NSK Ltd., , JP;
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.