Patent ID: 6339964
Filing Date: 2002-01-22
Classification: F16C,G01P

Abstract:
A device for measuring relative revolving speed between rates of a rolling contact bearing, the device comprising:a sealing device comprising a metal insert of annular shape fast for rotation with a rotating race of the bearing, the sealing device being fitted at one end of the device for measuring relative revolting speed; and a multipolar ring mounted to said insert and provided with magnetized segments of alternate polarity in a circumferential direction; wherein said multipolar ring is it ring of plastoferrite that is co-moulded to said insert, and that on said insert there is formed a plurality of radial recesses adapted to yield, during co-moulding, a corresponding plurality of radial protrusions in the multipolar ring, said radial recesses and protrusions being mutually engaged so as to prevent relative rotation between the multipolar ring and the metal insert, but allow relative radial displacement owing to thermal variations.