Dampened railway car truck

Abstract

A dampened bolster and side frame assembly for a railway truck including widened lands on the side frame and a plurality of spaced wedges on each side of the bolster and on opposite sides of the frame center line.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 
     
       1. A railway truck assembly including a pair of parallel side frames, a window in each of said side frames, a bolster extending perpendicularly between said side frames and having each of its opposite ends received in one of said windows, each of said windows having widened side walls, said side walls having portions extending .Iadd.in the same plane and .Iaddend.in opposite directions laterally of their associated side frame, said side walls .Iadd.and planar extending portions, .Iaddend.paralleling each other and carrying a plurality of wear plates, .Iadd.with each wear plate having its planar engaging surface parallel with the planar side wall and extending portions, .Iaddend.said wear plates being positioned on opposite sides of the linear center line of their associated side frame, each of said wear plates having a portion positioned inwardly of said extending side wall portions, each of said bolster end portions having a plurality of spaced pockets positioned in its sides, each of said pockets having a wall inclined downwardly away from and opposed to one of said wear plates, an individual wedge element received in each of said pockets, each of said wedge elements engaging the inclined wall of its associated pocket and engaging the wear plate opposed to its associated pocket .Iadd.the entire engaging surfaces of the respective wear plates and wedge elements being in substantially the same lateral plane, .Iaddend.and yielding means for each of said wedge elements, each said yielding means being positioned in said window and urging its associated wedge element toward its associated pocket. 
     
     
       2. The structure of claim 1 characterized by and including a spring grouping positioned in each said window and beneath each said bolster end portion to resist movement of each said bolster portion toward the bottom of each said window, said spring grouping comprising a first spring group formed of a plurality of spring assemblies and positioned along the linear center line of its associated window and a second spring group formed of a plurality of spring assemblies positioned on opposite sides of said first spring group. 
     
     
       3. In a railway truck bolster and side frame assembly, a side frame having a window, a bolster having an end portion penetrating said window, said side frame having parallel .Iadd.and planar .Iaddend.window side wall portions extending .Iadd.only .Iaddend.laterally in opposite directions from the linear center line of said side frame, a first pair of wedge means engaging one side of said bolster end and one of said side wall portions, a second pair of wedge means engaging the opposite side of said bolster end and the other of said side wall portions, said wedge means of said first pair being positioned on opposite sides of the linear center line of said frame, said wedge means of said second pair being positioned on opposite sides of said center line of said side frame, each of said wedge means of said first pair being opposite and aligned with a wedge means of said second pair .Iadd.the entire engaging surfaces of the respective and engaging wedge means and side frame being in substantially the same plane and applying only compressive forces perpendicular to the bolster center line and only frictional shear forces parallel to the bolster center line upon the opposing surfaces of said side frame.Iaddend.. 
     
     
       4. A railway side frame and bolster assembly including a side frame having a window, the vertical side walls of said window including parallel .Iadd.and planar .Iaddend.portions extending laterally in opposite directions from the longitudinal center line of said side frame and substantially beyond the main body of said side frame, said bolster having an end portion penetrating said window and wedge means engaging the opposite sides of said bolster end portion and said laterally extending side wall portions on opposite sides of the longitudinal center line of said side frame .Iadd.with the entire engaging surfaces of said wedge means and said laterally and planar extending side wall portions being in substantially the same plane.Iaddend.. 
     
     
       5. The structure of claim 4 characterized by and including a horizontal bottom wall defining the bottom of said window, said bottom wall extending between said side walls and laterally in opposite directions from the longitudinal center line of said side frame and substantially beyond the main body of said side frame, first spring means carried on said bottom wall and engaging the undersurface of said bolster end portion and second spring means carried on said bottom wall and engaging the undersurface of said wedge means.