Cylindrical cover attached encoder apparatus

Abstract

A cylindrical cover-attached encoder apparatus, including a magnetic metal-based body having a cylindrical shape, a magnetic rubber-based encoder having a cylindrical shape and formed around the outer peripheral surface of said magnetic metal-based cylindrical body, and a nonmagnetic material-based cover having a cylindrical shape and adapted to be mounted on said magnetic rubber-based encoder for covering the outer peripheral surface of the cylindrical portion of said magnetic rubber-based encoder.

1 . A cylindrical cover-attached encoder apparatus, including:
 a magnetic metal-based body having a cylindrical shape;   a magnetic rubber-based encoder having a cylindrical shape and formed around the outer peripheral surface of said magnetic metal-based cylindrical body; and   a nonmagnetic material-based cover having a cylindrical shape and adapted to be mounted on said magnetic rubber-based encoder for covering the outer peripheral surface of the cylindrical portion of said magnetic rubber-based encoder.   
   
   
       2 . The cylindrical cover-attached encoder apparatus as defined in  claim 1 , wherein the magnetic metal-based cylindrical body is formed by using any of the sintered metals. 
   
   
       3 . The cylindrical cover-attached encoder apparatus as defined in  claim 1 , wherein the magnetic metal-based cylindrical body is formed by using any of the steel materials. 
   
   
       4 . The cylindrical cover-attached encoder apparatus as defined in  claim 1 , wherein one end of the cylindrical portion of said nonmagnetic material-based cover which covers the outer peripheral surface of the magnetic rubber-based encoder is extending beyond the cylindrical portion of the magnetic rubber-based encoder in the axial direction of the magnetic metal-based cylindrical body and wherein the nonmagnetic material-based cover is attached to the magnetic rubber-based encoder by swaging the one end of the cover which extending beyond the cylindrical portion of the magnetic rubber-based encoder. 
   
   
       5 . The cylindrical cover-attached encoder apparatus as defined in  claim 2 , wherein one end of the cylindrical portion of said nonmagnetic material-based cover which covers the outer peripheral surface of the magnetic rubber-based encoder is extending beyond the cylindrical portion of the magnetic rubber-based encoder in the axial direction of the magnetic metal-based cylindrical body and wherein the nonmagnetic material-based cover is attached to the magnetic rubber-based encoder by swaging the one end of the cover which extending beyond the cylindrical portion of the magnetic rubber-based encoder. 
   
   
       6 . The cylindrical cover-attached encoder apparatus as defined in  claim 3 , wherein one end of the cylindrical portion of said nonmagnetic material-based cover which covers the outer peripheral surface of the magnetic rubber-based encoder is extending beyond the cylindrical portion of the magnetic rubber-based encoder in the axial direction of the magnetic metal-based cylindrical body and wherein the nonmagnetic material-based cover is attached to the magnetic rubber-based encoder by swaging the one end of the cover which extending beyond the cylindrical portion of the magnetic rubber-based encoder.