Sensor bearings for determining rotational speed and/or angle of torsion

A sensor bearing for the detection of rotational speed and angle of torsion of a shaft or hub or axle comprising:

• a bearing comprising an inner raceway, an outer raceway, and cage means situated between said inner raceway and said outer raceway;
• a plurality of magnetic means constituting an even number situated between said inner raceway and said outer raceway, each of said magnetic means being kept at a constant distance from another magnetic means respectively adjacent thereto by said cage means, said magnetic means rotating at a speed which is constantly proportional to said rotational speed to said shaft or hub or axle, and each of said magnetic means comprising a magnet of opposite polarity to the polarity of a magnet of said another magnetic means respectively adjacent thereto;
• and
• at least two magnetic sensors, each of said magnetic sensors situated in proximity to said outer raceway and spaced apart from each other and along the inner periphery of said outer raceway, and each of said magnetic sensors generating an electrical signal each time one of said rotating magnetic means comes into close proximity to said magnetic sensor during said magnetic means' rotation.