[특허]Endless track for traction of a vehicle

Camoplast Solideal Inc.

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Endless track for traction of a vehicle

국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B62D-055/24 B62D-055/12
출원번호	US-0325783 (2011-12-14)
등록번호	US-9067631 (2015-06-30)
발명자 / 주소	Lussier, Alain Leblanc, François Boily, Patrice
출원인 / 주소	Camoplast Solideal Inc.
대리인 / 주소	Fish & Richardson P.C.
인용정보	피인용 횟수 : 0 인용 특허 : 127

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In some aspects, an endless track for traction of an off-road vehicle (e.g., an agricultural vehicle, an industrial vehicle, a construction vehicle, or a military vehicle) includes an elastomeric belt-shaped body having an inner surface for facing wheels of the vehicle and a ground-engaging outer surface. The endless track also includes elastomeric lugs, such as drive/guide lugs projecting from the inner surface and/or traction lugs projecting from the ground-engaging outer surface. The elastomeric lug may have a material defining an arrangement of zones of different materials (e.g., different elastomeric materials) to exhibit a desired variation of a material property (e.g., a modulus of elasticity) across the arrangement of zones of different materials. A zone of the elastomeric lug may have a dedicated function, such as a wear indicator zone. An elastomeric drive lug can include an uneven drive surface for engaging a drive member of a drive wheel.

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1. An endless track for traction of an off-road vehicle, the endless track being mountable around a plurality of wheels of the off-road vehicle, the plurality of wheels comprising a drive wheel for driving the endless track, the endless track comprising: an elastomeric belt-shaped body comprising an inner surface for facing the wheels and a ground-engaging outer surface for engaging the ground; anda plurality of elastomeric drive/guide lugs projecting from the inner surface, each elastomeric drive/guide lug of the plurality of elastomeric drive/guide lugs having a material composition defining an arrangement of zones of different materials, the arrangement of zones of different materials comprising a plurality of zones of different elastomeric materials, the plurality of zones of different elastomeric materials comprising at least three zones of different elastomeric materials, the elastomeric drive/guide lug exhibiting a desired variation of a material property across the arrangement of zones of different materials. 2. The endless track of claim 1, wherein the desired variation of the material property includes an increase of the material property inwardly. 3. The endless track of claim 1, wherein the material property is a modulus of elasticity. 4. The endless track of claim 3, wherein the desired variation of the modulus of elasticity includes an increase of the modulus of elasticity inwardly. 5. The endless track of claim 3, wherein the desired variation of the modulus of elasticity has a spatial rate of change of no more 5 MPa/mm. 6. The endless track of claim 3, wherein the desired variation of the modulus of elasticity has a spatial rate of change of no more than 3 MPa/mm. 7. The endless track of claim 1, wherein the desired variation of the material property reduces a potential for crack propagation in the elastomeric drive/guide lug. 8. The endless track of claim 1, wherein the desired variation of the material property includes a discrete gradient of the material property. 9. The endless track of claim 1, wherein the arrangement of zones of different materials comprises at least four zones of different materials. 10. The endless track of claim 1, wherein the plurality of zones of different elastomeric materials comprises at least four zones of different elastomeric materials. 11. The endless track of claim 1, wherein the arrangement of zones of different materials comprises a plurality of layers of different materials disposed on one another. 12. The endless track of claim 1, wherein the arrangement of zones of different materials comprises a zone of non-elastomeric material. 13. The endless track of claim 12, wherein the non-elastomeric material is a metallic material. 14. The endless track of claim 12, wherein the non-elastomeric material is a polymeric material. 15. The endless track of claim 1, wherein at least two zones of the arrangement of zones of different materials have different thicknesses. 16. The endless track of claim 1, wherein a first zone of the arrangement of zones is more inward and thicker than a second zone of the arrangement of zones. 17. The endless track of claim 1, wherein a first zone of the arrangement of zones is thicker and stiffer than a second zone of the arrangement of zones. 18. The endless track of claim 1, wherein the material property is a first material property, the elastomeric drive/guide lug exhibiting a desired variation of a second material property across the arrangement of zones of different materials. 19. The endless track of claim 18, wherein the first material property is a modulus of elasticity and the second material property is a coefficient of friction with at least one of the wheels contactable by the elastomeric drive/guide lug. 20. The endless track of claim 19, wherein the desired variation of the modulus of elasticity includes an increase of the modulus of elasticity inwardly and the desired variation of the coefficient of friction includes a decrease of the coefficient of friction outwardly. 21. The endless track of claim 1, wherein the material property is a crack propagation resistance. 22. The endless track of claim 21, wherein the desired variation of the crack propagation resistance includes an increase of the crack propagation resistance outwardly. 23. The endless track of claim 1, wherein the material property is a tensile strength. 24. The endless track of claim 1, wherein a ratio of different values of the material property of adjacent zones of the arrangement of zones of different materials is at least 0.4. 25. The endless track of claim 1, wherein a ratio of different values of the material property of adjacent zones of the arrangement of zones of different materials is at least 0.6. 26. The endless track of claim 1, wherein a ratio of a minimum value of the material property in the elastomeric drive/guide lug and a maximum value of the material property in the elastomeric drive/guide lug is at least 0.2. 27. The endless track of claim 1, wherein a ratio of a minimum value of the material property in the elastomeric drive/guide lug and a maximum value of the material property in the elastomeric drive/guide lug is at least 0.4. 28. An off-road vehicle comprising the endless track of claim 1. 29. The off-road vehicle of claim 28, wherein the off-road vehicle is an agricultural vehicle, a construction vehicle or a military vehicle. 30. The endless track of claim 1, wherein a first one of the different elastomeric materials comprises rubber and a second one of the different elastomeric materials comprises an elastomer other than rubber. 31. The endless track of claim 30, wherein the elastomer other than rubber is a polyurethane elastomer. 32. An endless track for traction of an off-road vehicle, the endless track being mountable around a plurality of wheels of the off-road vehicle, the plurality of wheels comprising a drive wheel for driving the endless track, the endless track comprising: an elastomeric belt-shaped body comprising an inner surface for facing the wheels and a ground-engaging outer surface for engaging the ground; anda plurality of elastomeric drive/guide lugs projecting from the inner surface, each elastomeric drive/guide lug of the plurality of elastomeric drive/guide lugs comprising a plurality of zones of different elastomeric materials, the plurality of zones of different elastomeric materials comprising at least three zones of different elastomeric materials, the elastomeric drive/guide lug exhibiting an increase of a modulus of elasticity inwardly over the plurality of zones of different elastomeric materials. 33. An endless track for traction of an off-road vehicle, the endless track being mountable around a plurality of wheels of the off-road vehicle, the plurality of wheels comprising a drive wheel for driving the endless track, the endless track comprising: an elastomeric belt-shaped body comprising an inner surface for facing the wheels and a ground-engaging outer surface for engaging the ground; anda plurality of elastomeric drive/guide lugs projecting from the inner surface, each elastomeric drive/guide lug of the plurality of elastomeric drive/guide lugs comprising a first elastomeric material, a second elastomeric material stiffer than the first elastomeric material, and a third elastomeric material stiffer than the second elastomeric material, the first elastomeric material being disposed between a periphery of the elastomeric drive/guide lug and the second elastomeric material, the second elastomeric material being disposed between the first elastomeric material and the third elastomeric material. 34. A method of making an endless track for traction of an off-road vehicle, the endless track being mountable around a plurality of wheels of the off-road vehicle, the plurality of wheels comprising a drive wheel for driving the endless track, the method comprising: forming an elastomeric belt-shaped body of the endless track, the elastomeric belt-shaped body comprising an inner surface for facing the wheels and a ground-engaging outer surface for engaging the ground; andforming a plurality of elastomeric lugs of the endless track which project from a given one of the inner surface and the ground-engaging outer surface, each elastomeric lug of the plurality of elastomeric lugs having a material composition defining an arrangement of zones of different materials, the arrangement of zones of different materials comprising a plurality of zones of different elastomeric materials, the plurality of zones of different elastomeric materials comprising at least three zones of different elastomeric materials, the elastomeric lug exhibiting a desired variation of a material property across the arrangement of zones of different materials.

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Endless track for traction of a vehicle

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