Sensor bearings for determining rotational speed and/or angle of

Bearings – Rotary bearing – Antifriction bearing

Patent

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Details

384446, F16C 3354

Patent

active

050261789

ABSTRACT:
A sensor bearing for the detection of rotational speed and angle torsion of a shaft or hub or axle comprises a bearing having an inner raceway, an outer raceway, and a cage situated between the inner raceway and the outer raceway. A plurality of balls is rotated around halfway between the inner raceway and the outer raceway at a speed proportional to the rotational speed of the shaft or hub or axle. Each of the balls contains a magnet integral thereto. The sensor bearing also comprises a plurality of hall effect sensors spaced along the inner periphery of the outer raceway and at a distance proportional to the spacing of the balls along the raceway such that, as each ball passes one of the Hall effect sensors, an electrical signal is generated. The use of two or more Hall effect snesors and the analysis of the combination of electrical signals generated thereby results in a determination of the rotational speed of the shaft or hub or axle which is superior to that which could be achieved with a single magnetic sensor.

REFERENCES:
patent: 4688951 (1987-08-01), Guers
patent: 4865468 (1989-09-01), Kato et al.
patent: 4884901 (1989-12-01), Harsdorff
patent: 4946296 (1990-08-01), Olschewski et al.

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