초록 ▼

A railway truck assembly provides sprung support of a car body with respect to the truck wheels by means of compression springs interposed between axle carried supports such as truck side frames and a car body support such as a bolster, wherein biased friction assemblies provide fit-up and friction

A railway truck assembly provides sprung support of a car body with respect to the truck wheels by means of compression springs interposed between axle carried supports such as truck side frames and a car body support such as a bolster, wherein biased friction assemblies provide fit-up and friction damping of relative motion between the axle carried supports and the car body support, the friction assemblies including rigid metallic friction members and elastomeric elements received in a pocket formed by spaced surfaces which engage the respective members with the elastomeric elements in biased engagement with a pocket surface and having an elastic characteristic to provide an elastomeric response for non-rigid compliance and cushioning of low level car body support force variation through elastic deformation thereof, and damping of larger level car body support force variation through bodily sliding of the friction wedges on frictionally engaged surfaces in repeatable cycles of elastomeric cushioning, friction break, and bodily sliding.

대표청구항 ▼

In a railway truck assembly having a pair of elongated, laterally spaced metal side frames each having a longitudinally central open area and an elongated metal bolster having the ends thereof extending at least into said open areas, respectively, and supported therein by upwardly extending spring a

In a railway truck assembly having a pair of elongated, laterally spaced metal side frames each having a longitudinally central open area and an elongated metal bolster having the ends thereof extending at least into said open areas, respectively, and supported therein by upwardly extending spring arrangements carried by said side frames with the upper ends thereof in engagement with the undersurfaces of said ends of said bolster, respectively, to support said bolster for movement relative to said side frames, wherein each end of said bolster has opposed downwardly open and open ended pockets with sloping inner surface means converging downwardly with respect to each other and each of said side frames has at the longitudinally spaced ends of said open area thereof essentially vertically extending first surfaces spaced outwardly of the open end of the one of said pockets adjacent thereto, a friction assembly comprising: a metal friction member adapted to be disposed at least partially within a given one of said pockets adjacent a respective one of said first surfaces with a vertically extending second surface thereof in slidable engagement with said one of said first surfaces, said friction member having a surface extending in spaced confronting relatioship to the said sloping inner surface means of said one of said pockets to provide a pair of spaced confronting surfaces; an elastomeric means comprised of a pair of laterally spaced elastomeric portions located between said pair of spaced confronting surfaces with each of said portions having a pair of spaced exterior surfaces which are engageable, respectively, with said pair of spaced confronting surfaces; at least one of said exterior surfaces of said elastomeric means being slidable with respect to the one of said pair of spaced confronting surfaces in engagement therewith; helical coil spring means engageable with said friction assembly; means for supporting said helical coil spring means with respect to said friction assembly in a manner to maintain said friction assembly in continuously biased engagement with the respective said first surface and inner surface means; said elastomeric means having an elastic characteristic that said vertically extending second surface of said friction member is in stationary engagement with the respective said first surface during an initial extent of relative movement of said bolster with respect to said side frames in either one of opposite vertical directions and in sliding engagement with said first surface cooperable therewith after said initial extent, with said initial extent being of relatively constant magnitude throughout repeated cycles of said relative movement in said opposite directions and said continuously biased engagement being maintained at a relatively uniform magnitude of bias during the transition from said stationary engagement to said sliding engagement.