An endless track chairs for use with a track-type vehicle comprises a cartridge joined to the links of first and second link sets for relative rotation between the link sets.
대표청구항▼
What is claimed is: 1. An endless track chain for use with a track-type vehicle, the endless track chain comprising: a first link set and a second link set, the first link set comprising a first link and a second link, the second link set comprising a third link and a fourth link, and a cartridge f
What is claimed is: 1. An endless track chain for use with a track-type vehicle, the endless track chain comprising: a first link set and a second link set, the first link set comprising a first link and a second link, the second link set comprising a third link and a fourth link, and a cartridge for relative rotation between the first link set and the second link set, the cartridge comprising: a pin, an inner bushing journalled on the pin for relative rotation therebetween, an outer bushing journalled on the inner bushing for relative rotation therebetween, an annular first spacer and an annular second spacer, the first and second spacers positioned axially outboard of the outer bushing, fixed to the inner bushing, and fixed respectively to the first and second links, a first collar and a second collar, the first and second collars positioned respectively axially outboard of the first and second spacers, fixed to the pin, and fixed respectively to the third and fourth links, an annular first seal and an annular second seal, the first and second seals captured between the outer bushing and the first and second spacers, and an annular third seal and an annular fourth seal, the third and fourth seals captured respectively between the first and second spacers and the first and second collars, wherein the inner bushing comprises a radial first bushing shoulder axially inboard of a first end of the inner bushing and a radial second bushing shoulder axially inboard of a second end of the inner bushing, the first spacer comprises a radial first spacer shoulder engaging the first bushing shoulder, and the second spacer comprises a radial second spacer shoulder engaging the second bushing shoulder. 2. The track chain of claim 1, wherein the outermost outside diameter of the first spacer is greater than the outermost outside diameter of the first collar, the outermost outside diameter of the second spacer is greater than the outermost outside diameter of the first spacer, and the outermost outside diameter of the second collar is greater than the outermost outside diameter of the second spacer. 3. The track chain of claim 2, wherein the third link comprises a radial retainer tab engaging a shoulder of the first collar, the fourth link lacks a radial retainer tab corresponding to the radial retainer tab of the third link, and the second collar lacks a shoulder corresponding to the shoulder of the first collar. 4. The track chain of claim 1, wherein the third link comprises a radial retainer tab engaging a shoulder of the first collar, the fourth link lacks a radial retainer tab corresponding to the radial retainer tab of the third link, and the second collar lacks a shoulder corresponding to the shoulder of the first collar. 5. The track chain of claim 1, wherein the inner bushing comprises a plurality of axially aligned cylindrical sections, and adjacent cylindrical sections of the plurality of axially aligned cylindrical sections have outside diameters different from one another. 6. The track chain of claim 1, wherein each of the first spacer and the second spacer comprises an axially elongated inboard portion, an axially elongated outboard portion axially outboard and radially inward of the inboard portion, and a radial shoulder extending between a radially inside surface of the inboard portion and a radially inside surface of the outboard portion, the inboard portion of the first spacer receives the first seal in a pocket of that inboard portion, the inboard portion of the second spacer receives the second seal in a pocket of that inboard portion, the outboard portion of the first spacer extends into a counter-bore of the first collar, and the outboard portion of the second spacer extends into a counter-bore of the second collar. 7. An endless track chain for use with a track-type vehicle, the endless track chain comprising: a first link set and a second link set, the first link set comprising a first link and a second link, the second link set comprising a third link and a fourth link, and a cartridge for relative rotation between the first link set and the second link set, the cartridge comprising: a pin, an inner bushing journalled on the pin for relative rotation therebetween, an outer bushing journalled on the inner bushing for relative rotation therebetween, an annular first spacer and an annular second spacer, the first and second spacers positioned axially outboard of the outer bushing, fixed to the inner bushing, and fixed respectively to the first and second links, a first collar and a second collar, the first and second collars positioned respectively axially outboard of the first and second spacers, fixed to the pin, and fixed respectively to the third and fourth links, an annular first seal and an annular second seal, the first and second seals captured between the outer bushing and the first and second spacers, and an annular third seal and an annular fourth seal, the third and fourth seals captured respectively between the first and second spacers and the first and second collars, wherein each of the first collar and the second collar comprises a counter-bore, the inner bushing and the first spacer extend into the counter-bore of the first collar so as to cooperate with the first collar to effectively provide a lubricated rotationally slidable contact zone therebetween, and the inner bushing and the second spacer extend into the counter-bore of the second collar so as to cooperate with the second collar to effectively provide a lubricated rotationally slidable contact zone therebetween. 8. The track chain of claim 1, wherein each of the first and second spacers has a radially inside contour with a varying inside diameter, the inner bushing has a radially outside contour with a varying outside diameter, and the inside contour of each of the first and second spacers mates with the outside contour of the inner bushing. 9. The track chain of claim 1, wherein the inner bushing comprises a first neck-down portion, a second neck-down portion, and an intermediate portion extending between the first and second neck-down portions and having an outside diameter greater than an outside diameter of the first neck-down portion and an outside diameter of the second neck-down portion such that the first bushing shoulder extends between a cylindrical radially outside surface of the intermediate portion, defining the outside diameter of the intermediate portion, and a cylindrical radially outside surface of the first neck-down portion, defining the outside diameter of the first neck-down portion, and the second bushing shoulder extends between the cylindrical radially outside surface of the intermediate portion and a cylindrical radially outside surface of the second neck-down portion, defining the outside diameter of the second neck-down portion. 10. The track chain of claim 1, wherein each of the first spacer and the second spacer comprises an axially elongated inboard portion, an axially elongated outboard portion axially outboard and radially inward of the inboard portion, and the respective spacer shoulder extending between a cylindrical radially inside surface of the inboard portion, defining an inside diameter of the inboard portion, and a cylindrical radially inside surface of the outboard portion, defining an inside diameter of the outboard portion, the inboard portion of the first spacer receives the first seal in a pocket of that inboard portion, the inboard portion of the second spacer receives the second seal in a pocket of that inboard portion. 11. The track chain of claim 1, wherein the inner bushing comprises a first neck-down portion, a second neck-down portion, and an intermediate portion extending between the first and second neck-down portions and having an outside diameter greater than an outside diameter of the first neck-down portion and an outside diameter of the second neck-down portion such that the first bushing shoulder extends between a cylindrical radially outside surface of the intermediate portion, defining the outside diameter of the intermediate portion, and a cylindrical radially outside surface of the first neck-down portion, defining the outside diameter of the first neck-down portion, and the second bushing shoulder extends between the cylindrical radially outside surface of the intermediate portion and a cylindrical radially outside surface of the second neck-down portion, defining the outside diameter of the second neck-down portion, each of the first spacer and the second spacer comprises an axially elongated inboard portion, an axially elongated outboard portion axially outboard and radially inward of the inboard portion, and the respective spacer shoulder extending between a cylindrical radially inside surface of the inboard portion, defining an inside diameter of the inboard portion, and a cylindrical radially inside surface of the outboard portion, defining an inside diameter of the outboard portion, the outer bushing surrounds the intermediate portion, the inboard portion of the first spacer is fixed to the first link and is fixed to and surrounds the intermediate portion, the inboard portion of the second spacer is fixed to the second link and is fixed to and surrounds the intermediate portion, the outboard portion of the first spacer is fixed to and surrounds the first neck-down portion, and the outboard portion of the second spacer is fixed to and surrounds the second neck-down portion. 12. The track chain of claim 11, wherein the first neck-down portion and the outboard portion of the first spacer extend axially outwardly together into a counter-bore of the first collar so as to terminate at their respective end faces which are flush with one another and cooperate with the first collar to effectively provide a lubricated rotationally slidable contact zone therebetween, and the second neck-down portion and the outboard portion of the second spacer extend axially outwardly together into a counter-bore of the second collar so as to terminate at their respective end faces which are flush with one another and cooperate with the second collar to effectively provide a lubricated rotationally slidable contact zone therebetween. 13. A cartridge for use in an endless track chain, the endless track chain comprising a first link set and a second link set, the first link set comprising a first link and a second link, the second link set comprising a third link and a fourth link, the cartridge adapted for relative rotation between the first link set and the second link set, the cartridge comprising: a pin, an inner bushing journalled on the pin for relative rotation therebetween, an outer bushing journalled on the inner bushing for relative rotation therebetween, an annular first spacer and an annular second spacer, the first and second spacers positioned axially outboard of the outer bushing, fixed to the inner bushing, and configured to be fixed respectively to the first and second links, a first collar and a second collar, the first and second collars positioned respectively axially outboard of the first and second spacers, fixed to the pin, and configured to be fixed respectively to the third and fourth links, an annular first seal and an annular second seal, the first and second seals captured respectively between the outer bushing and the first and second spacers, and an annular third seal and an annular fourth seal, the third and fourth seals captured respectively between the first and second spacers and the first and second collars, wherein the inner bushing comprises a radial first bushing shoulder axially inboard of a first end of the inner bushing and a radial second bushing shoulder axially inboard of a second end of the inner bushing, the first spacer comprises a radial first spacer shoulder engaging the first bushing shoulder, and the second spacer comprises a radial second spacer shoulder engaging the second bushing shoulder. 14. The cartridge of claim 13, wherein the outermost outside diameter of the first spacer is greater than the outermost outside diameter of the first collar, the outermost outside diameter of the second spacer is greater than the outermost outside diameter of the first spacer, and the outermost outside diameter of the second collar is greater than the outermost outside diameter of the second spacer. 15. The cartridge of claim 13, wherein the first collar comprises a shoulder configured to engage a radial retainer tab of the third link, and the second collar lacks a shoulder corresponding to the shoulder of the first collar. 16. The cartridge of claim 13, wherein the inner bushing comprises a first neck-down portion, a second neck-down portion, and an intermediate portion extending between the first and second neck-down portions and having an outside diameter greater than an outside diameter of the first neck-down portion and an outside diameter of the second neck-down portion such that the first bushing shoulder extends between a cylindrical radially outside surface of the intermediate portion, defining the outside diameter of the intermediate portion, and a cylindrical radially outside surface of the first neck-down portion, defining the outside diameter of the first neck-down portion, and the second bushing shoulder extends between the cylindrical radially outside surface of the intermediate portion and a cylindrical radially outside surface of the second neck-down portion, defining the outside diameter of the second neck-down portion. 17. The cartridge of claim 13, wherein each of the first spacer and the second spacer comprises an axially elongated inboard portion, an axially elongated outboard portion axially outboard and radially inward of the inboard portion, and the respective spacer shoulder extending between a cylindrical radially inside surface of the inboard portion, defining an inside diameter of the inboard portion, and a cylindrical radially inside surface of the outboard portion, defining an inside diameter of the outboard portion, the inboard portion of the first spacer receives the first seal in a pocket of that inboard portion, the inboard portion of the second spacer receives the second seal in a pocket of that inboard portion. 18. The cartridge of claim 13, wherein the inner bushing comprises a first neck-down portion, a second neck-down portion, and an intermediate portion extending between the first and second neck-down portions and having an outside diameter greater than an outside diameter of the first neck-down portion and an outside diameter of the second neck-down portion such that the first bushing shoulder extends between a cylindrical radially outside surface of the intermediate portion, defining the outside diameter of the intermediate portion, and a cylindrical radially outside surface of the first neck-down portion, defining the outside diameter of the first neck-down portion, and the second bushing shoulder extends between the cylindrical radially outside surface of the intermediate portion and a cylindrical radially outside surface of the second neck-down portion, defining the outside diameter of the second neck-down portion, each of the first spacer and the second spacer comprises an axially elongated inboard portion, an axially elongated outboard portion axially outboard and radially inward of the inboard portion, and the respective spacer shoulder extending between a cylindrical radially inside surface of the inboard portion, defining an inside diameter of the inboard portion, and a cylindrical radially inside surface of the outboard portion, defining an inside diameter of the outboard portion, the inboard portion of the first spacer receives the first seal in a pocket of that inboard portion, the inboard portion of the second spacer receives the second seal in a pocket of that inboard portion, the first collar and the inboard and outboard portions of the first spacer cooperate to define a pocket in which the third seal is positioned, the second collar and the inboard and outboard potions of the second spacer cooperate to define a pocket in which the fourth seal is positioned, the outer bushing surrounds the intermediate portion, the inboard portion of the first spacer is configured to be fixed to the first link and is fixed to and surrounds the intermediate portion, the inboard portion of the second spacer is configured to be fixed to the second link and is fixed to and surrounds the intermediate portion, the outboard portion of the first spacer is fixed to and surrounds the first neck-down portion, and the outboard portion of the second spacer is fixed to and surrounds the second neck-down portion.
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이 특허에 인용된 특허 (18)
Hasselbusch, Michael D.; Maguire, Roy L.; Robertson, Darby R., Cartridge assembly for a track chain.
Marchione, Thierry Andre; Widder, Brent David; Thorson, Timothy Arthur; Kaufmann, Gregory Jerome, Laser brazing of annular metal seal member on track link.
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