Encoder wheel for a roller bearing

Details Encoder wheel for a roller bearing Encoder wheel for a roller bearing

1999-11-23

2001-06-05

Hannon, Thomas R. (Department: 3682)

Bearings

Rotary bearing

Antifriction bearing

C324S207250

Reexamination Certificate

active

06241395

ABSTRACT:

The present invention relates to an encoder wheel for a roller bearing.
In general, encoder wheels for roller bearings of a currently well-known type comprise a magnetised multipolar ring and a metallic support insert which supports the multipolar ring itself and which is force-fitted onto an internal ring of the relevant roller bearing.
In encoder wheels of the type described above, the magnetised multipolar ring presents a constant axial thickness to the variation of its own radius and is made of a magnetisable elastomer material, such as plastoferrite, and is installed in a position facing a sensor which is angularly mounted integral to the stationary part of the bearing on the outside of the bearing itself.
The above-mentioned sensor is sensitive to variations in the magnetic field due to the rotation of the multipolar ring, and is extremely subject to eventual errors in assembly with regard to the ring itself, that it to say that the sensor has to be assembled in relation to the ring in an extremely precise radial position in order to avoid any deterioration in the quality of the measurements to be carried out. In encoder wheels of the type described above, therefore, it is usually necessary to carry our lengthy and expensive registration operations once the sensor and the multipolar ring have been assembled.
The aim of the present invention is to produce an encoder wheel for a roller bearing which will be easy to use and which will also be simple and easy to install independent of the conditions pertaining to assembly.
According to the present invention, an encoder wheel for a contact bearing will be produced, comprising magnetised multipolar ring and a metallic insert for supporting the multipolar ring itself; the encoder wheel being characterised by the fact that the multipolar ring presents an axial thickness which is radially variable according to a determined law of variation.


REFERENCES:
patent: 5017868 (1991-05-01), Hajzler
patent: 5575568 (1996-11-01), Rigaux et al.
patent: 5969518 (1999-10-01), Merklein et al.
patent: 0 607 719 A1 (1994-07-01), None

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