Patent ID: 6174088
Filing Date: 2001-01-16
Classification: F16C,G01P

Abstract:
A rolling bearing unit with a rotation speed sensor comprising:a stationary member having a first raceway,a rotatable member having a second raceway,a plurality of rolling members rotatably provided between the first raceway and the second raceway,an encoder fixed to the rotatable member and to be concentric with the rotational axis thereof and having a detected portion the magnetic characteristics of which are adapted to alternately change, anda sensor fixed to the stationary member to detect changes in the magnetic characteristics of the encoder to produce signals as the rotatable member rotates, the sensor having a detecting portion which is axially opposed to the detected portion of the encoder with a clearance therebetween and located above the horizontal plane which contains the rotational axis of the rotatable member, so that the change in the clearance is minimized when subjected to a load from outside.