Compact wheel speed detector capable of saving space and improving workability

Abstract

A wheel speed detector for detecting a relative rotating speed between an outer ring and an inner ring by means of a magnetic sensor in association with a magnetic ring. A stationary seal member is fixed to the stationary ring and a rotatable seal member is fixed to the rotatable ring. The seal members engage to seal a gap between the inner ring and the outer ring. The magnetic sensor is fixed to a radial inner surface of the stationary seal member and the magnetic ring is fixed to a radial outer or a radial inner surface of the rotatable seal member and surfaces of the magnetic ring other than that fixed to the radial inner surface of the rotatable seal member are covered with a seal lip.

1 . A wheel speed detector for detecting a relative rotating speed between an outer ring and an inner ring by means of a magnetic sensor in association with an opposing magnetic ring, wherein one of the outer ring and the inner ring is rotatable while the other is stationary, the magnetic ring is fixed to the rotatable ring and the magnetic sensor is fixed to the stationary ring; and 
 wherein the magnetic sensor is fixed to a stationary seal member, which is disposed at a portion where the magnetic ring and the magnetic sensor are opposed to each other, on a surface opposite from the magnetic ring.    
     
     
         2 . A wheel speed detector for detecting a relative rotating speed between an outer ring and an inner ring by means of a magnetic sensor in association with an opposite magnetic ring, wherein one of the outer ring and the inner ring is rotatable while the other is stationary, the magnetic ring is fixed to the rotatable ring and the magnetic sensor is fixed to the stationary ring; and 
 wherein a seal device comprises a stationary seal member fixed to the stationary ring and a rotatable seal member being opposed axially to the stationary seal member and fixed to the rotatable ring, and seals a gap between the inner ring and the outer ring; and    the magnetic sensor is fixed on an axial outer or an axial inner surface of the stationary seal member.    
     
     
         3 . A wheel speed detector as claimed in  claim 2 , wherein 
 the magnetic ring is fixed on an axial outer or an axial inner surface of the rotatable seal member.    
     
     
         4 . A wheel speed detector as claimed in  claim 2 , wherein a seal portion of the seal device is provided on a portion where the stationary seal member and the rotatable seal member face each other.  
     
     
         5 . A wheel speed detector as claimed in  claim 2 , wherein the stationary member is nonmagnetic.  
     
     
         6 . A wheel speed detector as claimed in  claim 4 , wherein the stationary member is nonmagnetic.  
     
     
         7 . A wheel speed detector for detecting a relative rotating speed between an outer ring and an inner ring by means of a magnetic sensor fixed to the inner ring in association with an opposite magnetic ring fixed to the outer ring, wherein 
 a stationary member axially opposite to the magnetic ring is fixed to the inner ring, the magnetic sensor is fixed to the stationary member on a surface opposite from the magnetic ring, and a labyrinth seal is provided between the stationary member and an axial end surface of the outer ring.    
     
     
         8 . A wheel speed detector as claimed in  claim 7 , wherein a portion of said detector where the labyrinth seal is provided is formed of a synthetic resin covering over the magnetic sensor and is integrated with the stationary member.