Shaft apparatus with bearing

Abstract

The shaft apparatus comprising a shaft, blocks fitted to an outer surface of the shaft in an axial direction at predetermined intervals, and a roller bearing. The roller bearing includes an inner ring fitted and fixed to the outer surface of the shaft, an outer ring, and a plurality of rollers interposed between the inner and outer rings to roll. First and second control rings for controlling the movement of the outer ring in the axial direction of the shaft are disposed between the shaft and the outer ring.

1 . A shaft apparatus comprising:
 a shaft;   blocks fitted to an outer surface of the shaft at an intervals in an axial direction;   a roller bearing which includes an inner ring fitted and fixed to the outer surface of the shaft, an outer ring, and rollers interposed between the inner and outer rings; and   first and second control rings which control movement of the outer ring in the axial direction of the shaft and are disposed between the shaft and the outer ring.   
   
   
       2 . The shaft apparatus according to  claim 1 , wherein at least one of the first and second control rings is formed integrally with an end portion of the inner or outer ring of the roller bearing. 
   
   
       3 . A shaft apparatus comprising:
 a shaft;   blocks fitted on an outer surface of the shat at an intervals in an axial direction;   a roller bearing which is disposed on the outer surface of the shaft, and includes an outer ring, rollers disposed between the outer surface of the shaft and the outer ring; and   an annular control member press-fitted and fixed to the outer surface of the shaft at a position close to an end portion of the roller bearing,   wherein at least one of end surfaces of the control member and the roller bearing which face each other, is formed as a curved surface and comes in contact with the other end surface thereof so as to control movement of the roller bearing in the axial direction.   
   
   
       4 . The shaft apparatus according to  claim 3 , wherein the control member is press-fitted and fixed to the outer surface of the shaft at a position close to an end surface of the outer ring of the roller bearing. 
   
   
       5 . The shaft apparatus according to  claim 3 , wherein the control member is press-fitted and fixed to the outer surface of the shaft at a position close to an end surface of a cage for retaining the rollers. 
   
   
       6 . A shaft apparatus comprising:
 a shaft;   blocks fitted on an outer surface of the shaft at an interval in an axial direction;   a roller bearing which is disposed on the outer surface of the shaft, and includes an outer ring and rollers disposed between the outer surface of the shaft and the outer ring, at lease one of the rollers being longer than the other rollers; and   a cylindrical control member which controls movement of the roller bearing in the axial direction and is press-fitted and fixed to the outer surface of the shaft at a position close to an end surface of the longer roller   
   
   
       7 . The shaft apparatus according to  claim 6 , wherein
 the control member includes a cylindrical portion press-fitted and fixed to the outer surface of the shaft and a flange portion protruding from an outer surface of an end portion of the cylindrical portion in an annular shape, and   an outer diameter of the flange portion is smaller than an outer diameter of the outer ring of the roller bearing.   
   
   
       8 . The shaft apparatus according to  claim 6 , wherein the control member is made of a material having lower hardness than the shaft. 
   
   
       9 . A bearing apparatus for comprising:
 a camshaft;   a plurality of cam blocks disposed in an axial direction on the camshaft;   a housing member including an arc concave portion;   a cap member which is fixed to the housing and includes an arc concave portion;   a roller bearing interposed between the arc concave portion of the housing member and the arc concave portion of the cap member so as to rotatably support the camshaft; and   annular first and second control rings which are separately provided from the camshaft, and are press-fitted and fixed to an outer surface of the camshaft at opposite side portions of the roller bearing in the axial direction,   wherein surfaces of the first and second rings that face each other are formed as slide surfaces, and the slide surfaces come in contact with opposite side surfaces of at least one of the housing member and the cap member to receive an axial load.