Elastic bushing device of traction device and railcar bogie

Abstract

An elastic bushing device of a traction device includes: an outer tube supported by a bogie; an inner tube into which a center pin is fitted, the inner tube being arranged at a radially inner side of the outer tube so as to be spaced apart from the outer tube and also arranged so as to be located higher in position than the outer tube; and an elastic body sandwiched between the inner tube and the outer tube. An outer peripheral surface, opposed to the elastic body, of the inner tube is inclined downward. An inner peripheral surface, opposed to the elastic body, of the outer tube is inclined upward. The elastic body has such a shape that a surface thereof located close to the inner tube is located higher in position than a surface thereof located close to the outer tube.

1 . An elastic bushing device for use in a traction device connecting a center pin and a bogie in a railcar,
 the elastic bushing device comprising:   an outer tube supported by the bogie;   an inner tube into which the center pin is fitted, the inner tube being arranged at a radially inner side of the outer tube so as to be spaced apart from the outer tube and also arranged so as to be located higher in position than the outer tube; and   an elastic body sandwiched between the inner tube and the outer tube, wherein:   an outer peripheral surface, opposed to the elastic body, of the inner tube is inclined downward;   an inner peripheral surface, opposed to the elastic body, of the outer tube is inclined upward; and   the elastic body has such a shape that a surface thereof located close to the inner tube is located higher in position than a surface thereof located close to the outer tube.   
     
     
         2 . The elastic bushing device according to  claim 1 , wherein the inner tube includes an engaging portion which engages with the center pin such that the inner tube is unrotatable relative to the center pin. 
     
     
         3 . A railcar bogie comprising:
 the elastic bushing device according to  claim 1 ; and   a bogie frame including a center pin receiver, the center pin receiver including an inner peripheral surface supporting the elastic bushing device, wherein:   the outer tube of the elastic bushing device is directly fitted into the center pin receiver;   a projecting portion projecting from the inner peripheral surface of the center pin receiver toward a center of the center pin receiver is formed continuously with the inner peripheral surface of the center pin receiver;   a support peripheral surface which is a part of the inner peripheral surface of the center pin receiver and located above the projecting portion supports an outer peripheral surface of the outer tube in a horizontal direction; and   a support bottom surface which is an upper surface of the projecting portion supports a lower end of the outer tube from below.   
     
     
         4 . A railcar bogie comprising:
 the elastic bushing device according to  claim 2 ; and   a bogie frame including a center pin receiver, the center pin receiver including an inner peripheral surface supporting the elastic bushing device, wherein:   the outer tube of the elastic bushing device is directly fitted into the center pin receiver;   a projecting portion projecting from the inner peripheral surface of the center pin receiver toward a center of the center pin receiver is formed continuously with the inner peripheral surface of the center pin receiver;   a support peripheral surface which is a part of the inner peripheral surface of the center pin receiver and located above the projecting portion supports an outer peripheral surface of the outer tube in a horizontal direction; and   a support bottom surface which is an upper surface of the projecting portion supports a lower end of the outer tube from below.