Rail road car truck with rocking sideframe
AssigneeNational Steel Car Limited
InventorJames W. Forbes
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 sideframes, the truck bolster being mounted transversely relative to the sideframes. The sideframes have spring seats for the groups of springs. The springs seats may be on rockers, or may be rigidly mounted in the sideframes. 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.
Claims47
A rail road car truck for rolling motion in a longitudinal direction along cross-wise spaced apart rail road tracks, said rail road car truck having a load rating, said rail road car truck comprising:
- a bolster, a first sideframe, a second sideframe, a first wheelset, a second wheelset, a first spring group, and a second spring group;
- said bolster having a first end and a second end;
- said bolster being mounted cross-wise between said sideframes;
- said sideframes having upper regions rockingly mounted to said wheelsets, in operation said sideframes being operable to swing cross-wise;
- said sideframes being mounted to yaw appreciably relative to said bolster;
- said first spring group being mounted on a lower region of said first sideframe, and said first end of said bolster being mounted on said first spring group;
- said second spring group being mounted on a lower region of said second sideframe, and said second end of said bolster being mounted on said second spring group;
- each of said sideframes having a stiffness opposing cross-wise swinging thereof, kP;
- each of said spring groups having a cross-wise shear stiffness, kSS;
- when loaded to said load rating, kP being less than kSS;
- said truck having resistance to yawing of said sideframes relative to said bolster;
- and
- said resistance to yawing of said bolster being a function of yaw displacement of said sideframes relative to said bolster;
- friction dampers and respective wear plates against which said friction dampers work when said bolster moves relative to said sideframes;
- and
- said first spring group has at least two rows of springs;
- and a single one of said wear plates is wider than said two rows of springs.
A rail road car truck for rolling motion in a longitudinal direction along cross-wise spaced apart rail road tracks, said rail road car truck having a load rating, said rail road car truck comprising:
- a bolster, a first sideframe, a second sideframe, a first wheelset, a second wheelset, a first spring group, and a second spring group;
- said bolster having a first end and a second end;
- said bolster being mounted cross-wise between said sideframes;
- said sideframes having upper regions rockingly mounted to said wheelsets, in operation said sideframes being operable to swing cross-wise;
- said sideframes being mounted to yaw appreciably relative to said bolster;
- said first spring group being mounted on a lower region of said first sideframe, and said first end of said bolster being mounted on said first spring group;
- said second spring group being mounted on a lower region of said second sideframe, and said second end of said bolster being mounted on said second spring group;
- each of said sideframes having a stiffness opposing cross-wise swinging thereof, kP;
- each of said spring groups having a cross-wise shear stiffness, kSS;
- when loaded to said load rating, kP being less than kSS;
- said truck having resistance to yawing of said sideframes relative to said bolster;
- and
- said resistance to yawing of said bolster being a function of yaw displacement of said sideframes relative to said bolster;
- and
- said truck includes stops operable to constrain lateral displacement of said bolster within a range of motion, said range of motion being at least 1″ to either side of a neutral position.
A rail road car truck for rolling motion in a longitudinal direction along rail road tracks, said rail road car truck having a load rating, said rail road car truck comprising:
- a bolster, a first sideframe, a second sideframe, a first wheelset, a second wheelset, a first spring group, and a second spring group;
- said bolster having a first end and a second end;
- said bolster being mounted cross-wise between said sideframes;
- said sideframes being rockingly mounted to said wheelsets, in operation said sideframes being operable to swing cross-wise;
- said sideframes being mounted to yaw appreciably relative to said bolster;
- said first spring group being mounted in said first sideframe, and said first end of said bolster being mounted on said first spring group;
- said second spring group being mounted in said second sideframe, and said second end of said bolster being mounted on said second spring group;
- each of said sideframes having a stiffness opposing cross-wise swinging thereof, kP;
- each of said spring groups having a cross-wise shear stiffness, kSS;
- when loaded to said load rating, kP being less than kSS;
- said truck having resistance to yawing of said sideframes relative to said bolster;
- and
- said sideframes having wear plates mounted thereto, said wear plates being square to said longitudinal direction;
- said spring groups including springs arranged in lengthwise rows and cross-wise columns;
- and
- said wear plates each presenting a planar surface that is wider in the cross-wise direction than two of said rows.
Dependencies are inferred from the claim text.