Method of track link manufacture

1. A track link for use with a track chain of a vehicle that includes a plurality of track pins and bushings, the track link comprising:

a main body portion that defines a plurality of apertures for receiving a track pin or bushing, the main body portion comprising a low alloy steel and the plurality of apertures extending along a first direction through the main body portion; and

a solid rail portion that that comprises a high alloy steel, forming a flat interface lacking a bonding agent with the main body portion making direct contact with the main body portion;

wherein the track link defines a minimum distance from the rail portion to any of the plurality of apertures measured along a second direction that is perpendicular to the first direction, and a consistent rail thickness that is measured along the second direction and that consistently is greater than zero, and a ratio of the rail thickness to the minimum distance ranges from 1.0 to 2.5.

2. The track link of claim 1 wherein the rail portion lacks apertures and is attached to the main body portion using linear friction adhesion.

3. The track link of claim 1 wherein the hardness of the rail portion of the track link is RCW C50-55.

4. The track link of claim 1 wherein the hardness of the main body portion is RCW C33-37.

5. The track link of claim 1 wherein the minimum distance from the rail portion to any of the plurality of apertures of the main body portion is 4-8 mm.

6. The track link of claim 1 wherein the rail thickness ranges from 4 to 20 mm.

7. A track chain assembly for use with a vehicle that includes an endless track drive, the track chain comprising:

a plurality of track pins and track bushings disposed about the track pins; and

a plurality of track links that are connected to each other by at least one of the plurality of track pins and track bushings, wherein at least one track link comprises a main body portion that defines a plurality of apertures for receiving at least one of the plurality of track pins and track bushings, the main body portion comprising a low alloy steel and the plurality of apertures extending along a first direction through the main body portion, and a rail portion that that comprises a high alloy steel;

wherein the track link defines a minimum distance from the rail portion to all of the plurality of apertures measured along a second direction that is perpendicular to the first direction, and an unvarying rail thickness that is measured along the second direction, and a ratio of the rail thickness to the minimum distance ranges from 1.0 to 2.5, and the rail portion forms a linear interface with the main body portion, the linear interface lacking a bonding agent.

8. The track chain of claim 7 wherein the rail portion lacks apertures and is attached to the main body portion using linear friction adhesion.

9. The track chain of claim 7 wherein the hardness of the rail portion of the track link is RCW C50-55.

10. The track chain of claim 7 wherein the hardness of the main body portion is RCW C33-37.

11. The track chain of claim 7 wherein the rail portion defines a consistent rail thickness.

12. The track chain of claim 11 wherein the minimum distance from the rail portion to any aperture of the main body portion is 4-8 mm.

13. The track chain of claim 7 wherein the rail thickness ranges from 4 to 20 mm.

14. The track chain of claim 7 wherein all of the track links are similarly constructed.

15. A method of fabricating a track link comprising:

creating a rail portion of a track link from a high alloy steel;

creating a main body portion of a track link from a low alloy steel; and

friction adhering the rail portion onto the main body portion using the following process variables: an amplitude of 5 mm, and a frequency of 10-70 HZ

while maintaining a ratio of a consistent thickness of the rail portion to a length, with said length defined by a minimum distance from the rail portion to an aperture configured to receive a track pin or bushing, of 1.0 to 2.5.

16. The method of claim 15 wherein creating the rail portion or the main body includes forging.

17. The method of claim 15 further comprising hardening the main body portion to RCW C33-37.

18. The method of claim 15 further comprising hardening the rail portion to RCW C50-55.

19. The method of claim 18 wherein the hardening step occurs before the adhering step.