WHEEL BEARING WITH ROTATION SPEED DETECTION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a wheel bearing with a rotational speed detection device capable of reducing detection error of a sensor. SOLUTION: The wheel bearing device 1 comprises: an external member 2 to be fixed to a suspension and provided with a communicating openings on both the ends; an internal member 3 which is fixed with one end with a wheel and the other end is inserted through the one opening of the external member 2 and relatively rotates between the external member 2 via rotation body 4 arranged between the outer peripheral surface of insertion part and the internal periphery surface of the external member 2; a rotation member 6 provided with a common rotational axis with internal member 3, mounted on other end of the internal member 3 via an connection member provided with an annular part on which magnetic poles are arranged; a cap member 7 for sealing the other ends of the external member 2 like covering the rotation member 6 and the internal member 3; and a sensor 8 fixed to the cap member 7 and provided with a Hall element opposite to the magnetic poles of rotation member 6. The surface of the part containing the Hall element 8 is formed after the curvature of annular part of the rotation member 6. COPYRIGHT: (C)2006,JPO&NCIPI