Patent ID: 6877903
Filing Date: 2005-04-12
Classification: F16C,G01P

Abstract:
1. An axle unit for a vehicle comprising: a hub that installs thereon a vehicle wheel and is rotatable together with the vehicle wheel; a hub bearing that is mounted on a vehicle body and rotatably supports the hub; a rotary encoder that is attached concentrically to the hub and is rotatable together with the hub; a cover that is made of a non-magnetic material and covers an open end of the hub bearing that is located on the side thereof where the rotary encoder is provided; a rotational speed sensor that has a detecting section that is made of a magnetic material and disposed outside the cover and so as to face the rotary encoder; and a magnetic body that is provided at a portion of the cover that is placed between the detecting section of the rotational speed sensor and the rotary encoder; wherein the rotary encoder includes magnetic poles of N poles and S poles that are arranged circumferentially alternately on a surface thereof facing the detecting section of the rotational speed sensor; and wherein the magnetic body is configured to be able to face only one of the magnetic poles.