Axle box suspension for railway car

Abstract

The object of the present invention is to provide an axle box suspension for a railway car with a simple structure to fix coil springs and support rubbers, and enabling easy mounting operation. Coil springs 21 and 22 are disposed on top of an axle box 10 . Support rubbers 30 are disposed on front and rear portions of the axle box 10 with respect to the traveling direction of the railway car. A support shaft 31 is disposed at the axial center position of the support rubber 30 , and the upper end of the support shaft 31 is passed through the side beam 6 . The upper end of the support shaft 31 protruding from the upper surface of the side beam 6 is fixed via a nut. The operation of fixing the support shaft 31 to the side beam 6 by tightening the nut 40 can be performed at the upper surface area of the side beam 6 , so the operation is facilitated.

1 . An axle box suspension for a railway car comprising: 
 a coil spring for elastically supporting a bogie frame;    an axle box having on a top portion thereof a support seat for supporting the coil spring, and further having two holes opening upward for retaining support rubbers;    support rubbers disposed in said holes formed to the axle box, respectively; and    two support shafts each having a lower end portion retaining said support rubber and an upper end portion passed through and fixed to a side beam of the bogie frame.    
   
   
       2 . The axle box suspension for a railway car according to  claim 1 , wherein each support rubber is press-fit to a rubber receive seat, and the rubber receive seat is inserted to a rubber support portion formed to front and rear portions of the axle box in the traveling direction of the car, the rubber receive seat being fixed by a bolt from a lower surface of the rubber support portion.  
   
   
       3 . The axle box suspension for a railway car according to  claim 2 , wherein a hanging ring is protruded below the lower surface of the rubber support portion, and the hanging ring is secured to the support shaft by a bolt.  
   
   
       4 . The axle box suspension for a railway car according to  claim 1 , wherein the support shaft has a flange for receiving a lower surface of the side beam, the outer circumference of the flange having two axially parallel planes cut off, the two cut off planes being formed in parallel when seen from a width direction of the bogie.  
   
   
       5 . The axle box suspension for a railway car according to  claim 4 , wherein the cutoff planes is visible from a side direction of the bogie.  
   
   
       6 . An axle box suspension for a railway car comprising: 
 an axle box disposed on an axle via a bearing;    a coil spring disposed on the axle box for elastically supporting a bogie frame with respect to the axle box;    support rubbers disposed on rubber support portions formed on both sides of the axle box to the traveling direction of the car; and    support shafts each having an end inserted to an axial center position of the support rubber and another end passing through and fixed to a side beam of the bogie frame.    
   
   
       7 . The axle box suspension for a railway car according to  claim 6 , wherein 
 the axle box is disposed on both ends of the axle; and    two said axles are disposed in parallel to one bogie frame, the bogie frame being supported via the coil spring and the support rubber on the axle boxes on the two axles.    
   
   
       8 . The axle box suspension for a railway car according to  claim 6 , wherein a support seat for the coil spring is formed on a top portion of the axle box at the center of the traveling direction of the car, and a storage box for storing the coil spring is formed to the side beam of the bogie frame.