Railway car truck friction shoe

Patent metadata

Field	Value
Publication number	US-10589759-B2
Application number	US-201715453515-A
Country	US
Kind code	B2
Filing date	Mar 8, 2017
Priority date	Mar 8, 2017
Publication date	Mar 17, 2020
Grant date	Mar 17, 2020

Abstract

A friction shoe includes a bottom base engaging and supported by a pair of support springs, and a sloped wall engaging the sloped support face of a bolster. The bottom base includes a cylindrical spring lug that has a center opening that extends through the spring lug. The bottom surface of the spring lug is flat and smooth and is configured to engage an additional concentrically nested support spring. The additional spring increases the force between the vertical support face of the wedge and the vertical wear plate of the side frame.

First claim

What is claimed is:

1. A railway car truck comprising:
two parallel side frames, each side frame having at least one vertical support face:
a suspension spring assembly supported by the side frames;
a bolster transversely mounted between the side frames and supported by the suspension spring assembly, the bolster having at least one sloped support face;
an outer suspension spring;
a first inner suspension spring that is concentric with the outer suspension spring;
a second inner suspension spring that is concentric with the outer suspension spring and the first inner suspension spring, wherein the outer suspension spring, the first inner suspension spring, and the second inner suspension spring are concentrically nested; and
a friction shoe comprising:
two laterally spaced sloped walls each engaging one sloped support face of the bolster;
a vertical wall engaging the vertical support face of the side frame;
a bottom base engaging and supported by the outer suspension spring, the first inner suspension spring, and the second inner suspension spring, the bottom base including a cylindrical spring lug extending downwardly therefrom, the cylindrical spring lug having a center opening leading into a hollow area of the friction shoe and having a smooth flat bottom surface which engages the second inner suspension spring.

2. The friction shoe of claim 1 , wherein the friction shoe has two generally triangular side walls each having a manufacturing core support hole.

3. The friction shoe of claim 1 , wherein an outside diameter of the cylindrical spring lug is approximately equal to an outside diameter of the second inner suspension spring, an inside diameter of the cylindrical spring lug is approximately equal to an inside diameter of the second inner suspension spring, an inside diameter of the first inner suspension spring is greater than the outside diameter of the second inner suspension spring, and an inside diameter of the outer suspension spring is greater than an outside diameter of the first inner suspension spring.

4. The friction shoe of claim 1 , wherein the friction shoe provides a damping force of between 7500 and 12,000 pounds when the friction shoe is moving at a velocity of between 0 and 19 inches per second.

5. The friction shoe of claim 1 , wherein the friction shoe is comprised of cast iron.

6. The friction shoe of claim 1 , wherein the friction shoe is comprised of cast steel.

7. The friction shoe of claim 1 , wherein the friction shoe has a composite facing applied to the vertical support surface.

8. The friction shoe of claim 1 , wherein the laterally spaced sloped walls are comprised of two laterally spaced surfaces with a spacing wall located between the two laterally spaced surfaces.

9. A railway car truck, the railway car truck comprising:
an outer suspension spring;
a first inner suspension spring that is concentric with the outer suspension spring;
a second inner suspension spring that is concentric with the outer suspension spring and the first inner suspension spring, wherein the outer suspension spring, the first inner suspension spring, and the second inner suspension spring are concentrically nested; and
a friction shoe comprising:
a bottom base engaging and supported by the outer suspension spring, the first inner suspension spring, and the second inner suspension spring, the bottom base including a cylindrical spring lug extending downwardly therefrom, the cylindrical spring lug having a bottom surface that engages the second inner suspension spring;
a sloped wall configured to engage a sloped support face of a bolster; and
a vertical wall configured to engage a vertical support face of a side frame.

10. The railway car truck of claim 9 , wherein the spring lug includes a hollow opening extending vertically through the spring lug, wherein an outside diameter of the cylindrical spring lug is approximately equal to an outside diameter of the second inner suspension spring, an inside diameter of the cylindrical spring lug is approximately equal to an inside diameter of the second inner suspension spring, an inside diameter of the first inner suspension spring is greater than the outside diameter of the second inner suspension spring, and an inside diameter of the outer suspension spring is greater than an outside diameter of the first inner suspension spring.

11. The railway car truck of claim 9 , wherein the friction shoe provides a damping force of between 7500 and 16,250 pounds when the friction shoe is moving at a velocity of between 0 and 19 inches per second.

12. The railway car truck of claim 9 , wherein the friction shoe provides a normal force of between 2000 and 12,000 pounds.

13. The railway car truck of claim 9 , wherein the friction shoe is comprised of cast iron.

14. The railway car truck of claim 9 , wherein the friction shoe is comprised of cast steel.

15. The railway car truck of claim 9 , wherein the sloped wall extends to direct contact with the bottom base.

16. The railway car truck of claim 9 , wherein the sloped wall is comprised of two laterally spaced surfaces with a spacing wall located between the two laterally spaced surfaces.

17. A railway car truck, comprising:
an outer suspension spring;
a first inner suspension spring that is concentric with the outer suspension spring;
a second inner suspension spring that is concentric with the outer suspension spring and the first inner suspension spring, wherein the outer suspension spring, the first inner suspension spring, and the second inner suspension spring are concentrically nested; and
a friction shoe comprising:
a bottom base engaging the outer suspension spring, the first inner suspension spring, and the second inner suspension spring, the bottom base including a spring lug extending downwardly therefrom, the spring lug comprising:
a hollow opening extending vertically through the spring lug; and
a flat bottom surface, wherein the flat bottom surface provides a support surface that engages the second inner suspension spring.

18. The railway car truck of claim 17 , wherein the spring lug is cylindrical, wherein an outside diameter of the cylindrical spring lug is approximately equal to an outside diameter of the second inner suspension spring, an inside diameter of the cylindrical spring lug is approximately equal to an inside diameter of the second inner suspension spring, an inside diameter of the first inner suspension spring is greater than the outside diameter of the second inner suspension spring, and an inside diameter of the outer suspension spring is greater than an outside diameter of the first inner suspension spring.

19. The railway car truck of claim 18 , further comprising a vertical wall configured to engage a vertical support face of a side frame.

20. The railway car truck of claim 17 , further comprising a sloped wall configured to engage a sloped support face of a bolster, the sloped wall extending to direct contact with the bottom base.

Assignees

• Amsted Rail Co Inc

Inventors

• Coseglia John

Classifications

• B61F3/02

  with more than one axle · CPC title

• B61F5/06

  incorporating metal springs · CPC title

• B61F5/122 Primary

  with friction surfaces · CPC title

• B61F5/04 Primary

  Bolster supports or mountings (side bearings B61F5/14) · CPC title