Rail road car truck with rocking sideframe
OwnerJames W. Forbesinventor
Life of this patent
Estimating the term…
Abstract
A swing motion rail road freight car truck is provided that does not have lateral underslung cross bracing in the nature of a transom, a frame brace, or lateral rods. The truck has a truck bolster and a pair of side frames, the truck bolster being mounted transversely relative to the side frames. The side frames have spring seats for the groups of springs. The springs seats may be on rockers, or may be rigidly mounted in the side frames. Friction dampers are provided in inboard and outboard pairs. The biasing force on the dampers urges then to that act between the bolster ands and sideframes to resist parallelogram deflection of the truck.
Claims26
A swing motion rail road car truck, said truck having a maximum load rating, said truck comprising:
- a pair of first and second sideframes;
- a truck bolster mounted cross-wise between said sideframes;
- a pair of first and second spring groups, each spring group having a lateral shear constant, kspring shear;
- wheelsets, said wheelsets having bearings mounted thereto, and bearing adapters mounted to said bearings;
- said truck bolster having first and second ends, each of said ends being mounted to a respective one of said sideframes on a respective one of said spring groups;
- said truck bolster having a range of cross-wise travel relative to said sideframes;
- said sideframes each having a lower region supporting one of said spring groups;
- said sideframes having an upper region rockingly mounted to said bearing adapters;
- each sideframe having a lateral deflection constant, kpendulum at said maximum load rating;
- kpendulum being smaller than kspring shear;
- and
- said truck being free of unsprung cross-bracing.
A swing motion rail road car truck, said truck having a maximum rated load, said truck comprising:
- a pair of sideframes each having an upper region thereof rockingly mounted on wheelsets;
- a truck bolster mounted cross-wise between the sideframes on a pair of spring groups, said spring groups being supported by respective lower regions of said sideframes;
- said truck bolster having a range of cross-wise motion relative to said sideframes;
- said spring groups having resistance to cross-wise motion of said truck bolster;
- said sideframes having resistance to sideways angular rocking thereof;
- at said maximum rated load said resistance to sideways angular rocking of said sideframes being softer than said resistance of said respective spring groups to cross-wise motion of said bolster relative to said sideframes;
- and
- said truck being free of unsprung lateral cross-bracing.
Dependencies are inferred from the claim text.