ROLLER BEARING WITH ENCODER AND ITS MANUFACTURING METHOD

Title:

ROLLER BEARING WITH ENCODER AND ITS MANUFACTURING METHOD

Document Type and Number:

WIPO Patent Application WO/2004/113751

Kind Code:

A1

Abstract:

A rotational speed can be reliably detected at low cost by stabilizing the density of a magnetic flux coming from a permanent magnet encoder (10b) and reaching the detection portion of a sensor. The residual magnetic flux densities of an inner race (1), an outer race (14) and a ball (5) each made of a magnetic material are individually 0.2 mT or less, and 2 mT or less when assembled into a roller bearing unit. Therefore, the magnetic flux coming from the encoder (10b) is hardly affected by the residual magnetic flux of the roller bearing unit.

Inventors:

MAEDA TOSHIAKI (JP)

Application Number:

PCT/JP2004/008193

Publication Date:

December 29, 2004

Filing Date:

June 11, 2004

Export Citation:

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Assignee:

NSK LTD (JP)
MAEDA TOSHIAKI (JP)

International Classes:

G01P3/487; F16C19/18; F16C19/52; F16C33/78; F16C41/00; F16C43/04; G01P3/44; (IPC1-7): F16C41/00; F16C43/04; G01D5/245

Foreign References:

JP2002318239A	2002-10-31
JPH01234621A	1989-09-19
JP2001242187A	2001-09-07
JP2002365303A	2002-12-18
JPH08211081A	1996-08-20
JPH1123596A	1999-01-29
JPH06281018A	1994-10-07
JPH09203415A	1997-08-05
US4948277A	1990-08-14
JPH1123596A	1999-01-29

Other References: