Endless track for a track system and track system having the same

Abstract

An endless track for a track system and a track system having an endless track are disclosed. An endless track includes a carcass, an inner lug extending from an inner surface of the carcass, and an outer lug extending from an outer surface of the carcass. The outer lugs include first and second outer lug portions, respectively. The first outer lug portion extends from the outer surface to a joint height, has a joint interface at the joint height, has an outer lug reinforcement member, defines a base radius, and is made from a first material. The second outer lug portion extends from the joint interface to an outer lug height, has an engagement surface at the outer lug height, and is made from a second material different from the first material. Also, each outer lug has a draft angle defined by its longitudinal sides and the projection of its engagement surface.

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to U.S. Provisional Application No. 63 / 347,667, entitled "Endless Track for Track System and Track System Having Same," filed June 1, 2022, which is incorporated by reference in its entirety herein.

[0002] The present application relates generally to an endless track and a track system having an endless track. [Background technology]

[0003] Certain vehicles, such as heavy vehicles, such as military vehicles, agricultural vehicles (e.g., harvesters, combines, tractors, etc.), construction vehicles (e.g., trucks, front end loaders, etc.), forestry vehicles, and exploration vehicles, are used on soft, slippery, and / or uneven ground surfaces (e.g., dirt, mud, sand, ice, snow, etc.).

[0004] Traditionally, such vehicles have had large wheels with tires thereon to move the vehicle along the ground surface. Under certain conditions, such tires may have poor traction on some ground surfaces, and because these vehicles are generally heavy, the tires may compress the ground surface in an undesirable manner due to the weight of the vehicle.

[0005] To reduce the above-mentioned shortcomings, track systems have been developed to be used in place of at least some of the wheels and tires on a vehicle to increase traction and distribute the weight of the vehicle over a larger area on the ground surface. For example, under certain conditions, the track system allows the vehicle to be used in wet field conditions as opposed to its wheeled counterpart. In other conditions, the track system allows the vehicle to be used in terrain with low traction.

[0006] However, conventional track systems suffer from several disadvantages. Some endless tracks of conventional track systems may have low durability due in part to the high loads to which they may be subjected. Specifically, the endless tracks of conventional track systems may have low durability, especially at their outer lugs.

[0007] Therefore, what is desired is a track system that can alleviate at least some of the problems discussed above. Summary of the Invention [Problem to be solved by the invention]

[0008] The objective of the present technology is to remedy at least some of the disadvantages present in the prior art. [Means for solving the problem]

[0009] According to one aspect of the present technology, an endless track for a vehicle track system is provided. The endless track includes a carcass, a plurality of inner lugs, and a plurality of outer lugs. The carcass has an inner surface and an outer surface opposite the inner surface. The plurality of inner lugs extend from the inner surface and are spaced apart longitudinally along a longitudinal center plane of the endless track, and the plurality of outer lugs extend from the outer surface and are spaced apart longitudinally along the outer surface. Each one of the plurality of outer lugs includes a first outer lug portion extending from the outer surface to a bond height. The first outer lug portion defines a base radius and has a bond interface at the bond height. The first outer lug portion is made from a first material and includes an outer lug reinforcement member. Also, each one of the plurality of outer lugs includes a second outer lug portion extending from the bond interface of the first outer lug portion to the outer lug height. The second outer lug portion has an engagement surface at the outer lug height and is made from a second material different from the first material. Also, each one of the plurality of outer lugs includes a draft angle defined by a longitudinal side of the one of the plurality of outer lugs and a protrusion of an engagement surface of the one of the plurality of outer lugs.

[0010] In some embodiments, the outer lug stiffeners have an outer lug stiffener height, the ratio of the outer lug stiffener height to the bond height being at least about 0.75.

[0011] In some embodiments, the ratio of outer lug reinforcement member height to bond height is at least about 0.8.

[0012] In some embodiments, the ratio of outer lug reinforcement member height to bond height is at least about 0.85.

[0013] In some embodiments, the ratio of outer lug reinforcement member height to bond height is at least about 0.90.

[0014] In some embodiments, the ratio of outer lug reinforcement member height to bond height is at least about 0.95.

[0015] In some embodiments, the ratio of outer lug reinforcement member height to bond height is between about 0.75 and about 0.95.

[0016] In some embodiments, the ratio of the junction height to the outer lug height is about 0.5.

[0017] In some embodiments, the ratio of the joint height to the outer lug height is about 2 / 3.

[0018] In some embodiments, each one of the plurality of outer lugs has a first outer lug length measured at a vertical center of the outer lug reinforcement member generally parallel to a longitudinal center plane of the endless track, and each one of the plurality of outer lug reinforcement members has a first outer lug reinforcement member length measured at a vertical center of the outer lug reinforcement member generally parallel to a longitudinal center plane of the endless track, and a ratio of the first outer lug length to the first outer lug reinforcement member length is about 0.49.

[0019] In some embodiments, each one of the plurality of outer lugs has a second outer lug length measured at a first end of the outer lug reinforcement member generally parallel to a longitudinal center plane of the endless track, and each one of the plurality of outer lug reinforcement members has a second outer lug reinforcement member length measured at a first end of the outer lug reinforcement member generally parallel to a longitudinal center plane of the endless track, and a ratio of the second outer lug length to the second outer lug reinforcement member length is about 0.46.

[0020] In some embodiments, each one of the plurality of outer lugs has a third outer lug length measured at a second end of the outer lug reinforcement member generally parallel to a longitudinal center plane of the endless track, and each one of the plurality of outer lug reinforcement members has a third outer lug reinforcement member length measured at a second end of the outer lug reinforcement member generally parallel to a longitudinal center plane of the endless track, the ratio of the third outer lug length to the outer lug reinforcement member length being about 0.37.

[0021] In some embodiments, the outer lug reinforcement member length is at most 50 millimeters.

[0022] In some embodiments, the outer lug reinforcement members are made from a composite material.

[0023] In some embodiments, the outer lug reinforcement members are at least partially encased by fabric.

[0024] In some embodiments, the cross-sectional profile of the outer lug reinforcement members taken along the longitudinal center plane of the endless track has a generally hexagonal shape.

[0025] In some embodiments, the cross-sectional profile of the outer lug reinforcement members along the longitudinal center plane of the endless track has a generally rectangular shape.

[0026] In some embodiments, the draft angle is greater than about 6 degrees.

[0027] In some embodiments, the draft angle is greater than about 8 degrees.

[0028] In some embodiments, the draft angle is about 9 degrees.

[0029] In some embodiments, the virtual center of the base radius of one of the plurality of outer lugs coincides with the virtual center of the base radius of another one of the plurality of outer lugs adjacent to the one of the plurality of outer lugs.

[0030] In some embodiments, the first material has a first modulus of elasticity and the second material has a second modulus of elasticity, the first modulus of elasticity being less than the second modulus of elasticity.

[0031] In some embodiments, the first material has a first hardness value and the second material has a second hardness value, the second hardness value being greater than the first hardness value.

[0032] In some embodiments, the first outer lug portion is an underlying outer lug portion and the second outer lug portion is an overlying outer lug portion.

[0033] In some embodiments, the second lug portion is made from laminated layers of a second material.

[0034] In some embodiments, the second lug portion is pre-molded.

[0035] In some embodiments, the second lug portion is extruded.

[0036] In some embodiments, the longitudinal sides are a first longitudinal side and a second longitudinal side, and at least one of the first and second longitudinal sides defines an at least partially arcuate profile.

[0037] In some embodiments, at least one of the plurality of outer lugs is chevron-shaped.

[0038] In some embodiments, at least some of the plurality of outer lugs are longitudinally aligned with some of the plurality of inner lugs.

[0039] In some embodiments, the inner lugs are central drive lugs.

[0040] In some embodiments, the vehicle is a heavy vehicle.

[0041] In some embodiments, the endless track further comprises a plurality of longitudinal reinforcing members.

[0042] In some embodiments, the plurality of longitudinal strength members is at least one of a plurality of cables and a plurality of fabrics.

[0043] In some embodiments, the endless track further includes a plurality of inner lug reinforcing members, each one of the plurality of inner lug reinforcing members being disposed within one of the plurality of inner lugs.

[0044] According to another aspect of the present technology, there is provided a track system for a heavy vehicle, the track system including a frame, a plurality of wheel assemblies connected to the frame, and an endless track surrounding the plurality of wheel assemblies according to any of the above aspects or according to one or more of the above aspects and embodiments.

[0045] According to another aspect of the present technology, an endless track for a vehicle track system is provided, the endless track including a carcass, a plurality of inner lugs, and a plurality of outer lugs. The carcass has an inner surface and an outer surface opposite the inner surface. The plurality of inner lugs extend from the inner surface and are spaced apart longitudinally along the inner surface of the carcass. The plurality of outer lugs extend from the outer surface and are spaced apart longitudinally along the outer surface. Each one of the plurality of outer lugs includes a first outer lug portion extending from the outer surface to a bond height. The first outer lug portion defines a base radius and has a bond interface at the bond height. The first outer lug portion is made from a first material. And, each one of the plurality of outer lugs includes a second outer lug portion extending from the bond interface of the first outer lug portion to the outer lug height. The outer lug has an engagement surface at the outer lug height and is made from a second material different from the first material. The virtual center of the base radius of one of the plurality of outer lugs coincides with the virtual center of the base radius of another one of the plurality of outer lugs adjacent to the one of the plurality of outer lugs.

[0046] In some embodiments, the endless track further includes a plurality of outer lug reinforcement members each having an outer lug reinforcement member height, one of the plurality of outer lug reinforcement members being disposed within one of the plurality of outer lugs.

[0047] In some embodiments, the ratio of outer lug reinforcement member height to bond height is at least about 0.75.

[0048] In some embodiments, the ratio of outer lug reinforcement member height to bond height is at least about 0.8.

[0049] In some embodiments, the ratio of outer lug reinforcement member height to bond height is at least about 0.85.

[0050] In some embodiments, the ratio of outer lug reinforcement member height to bond height is at least about 0.90.

[0051] In some embodiments, the ratio of outer lug reinforcement member height to bond height is at least about 0.95.

[0052] In some embodiments, each one of the plurality of outer lugs has an outer lug length measured at a vertical center of the outer lug reinforcement member generally parallel to a longitudinal center plane of the endless track, and each one of the plurality of outer lug reinforcement members has an outer lug reinforcement member length measured at a vertical center of the outer lug reinforcement member generally parallel to a longitudinal center plane of the endless track, the ratio of outer lug length to outer lug reinforcement member length being about 0.47.

[0053] In some embodiments, each one of the plurality of outer lugs has a second outer lug length measured at a first end of the outer lug reinforcement member generally parallel to a longitudinal center plane of the endless track, and each one of the plurality of outer lug reinforcement members has a second outer lug reinforcement member length measured at a first end of the outer lug reinforcement member generally parallel to a longitudinal center plane of the endless track, and a ratio of the second outer lug length to the second outer lug reinforcement member length is about 0.41.

[0054] In some embodiments, each one of the plurality of outer lugs has a third outer lug length measured at a second end of the outer lug reinforcement member generally parallel to a longitudinal center plane of the endless track, and each one of the plurality of outer lug reinforcement members has a third outer lug reinforcement member length measured at a second end of the outer lug reinforcement member generally parallel to a longitudinal center plane of the endless track, the ratio of the third outer lug length to the outer lug reinforcement member length being about 0.45.

[0055] In some embodiments, the outer lug reinforcement member length is at most about 50 millimeters.

[0056] In some embodiments, the ratio of the junction height to the outer lug height is about 0.5.

[0057] In some embodiments, the ratio of the joint height to the outer lug height is about 2 / 3.

[0058] In some embodiments, the outer lug reinforcement members are made from a composite material.

[0059] In some embodiments, the outer lug reinforcement members are at least partially encased by fabric.

[0060] In some embodiments, the cross-section of the outer lug reinforcement members taken along the longitudinal center plane of the endless track has a generally hexagonal shape.

[0061] In some embodiments, the cross-section of the outer lug reinforcement members taken along the longitudinal center plane of the endless track has a generally rectangular shape.

[0062] In some embodiments, each one of the plurality of outer lugs has a draft angle defined by a side of the one of the plurality of outer lugs and a protrusion of an engagement surface of the one of the plurality of outer lugs.

[0063] In some embodiments, the draft angle is greater than about 6 degrees.

[0064] In some embodiments, the draft angle is greater than about 8 degrees.

[0065] In some embodiments, the draft angle is about 9 degrees.

[0066] In some embodiments, the first material has a first modulus of elasticity and the second material has a second modulus of elasticity, the first modulus of elasticity being less than the second modulus of elasticity.

[0067] In some embodiments, the first material has a first hardness value and the second material has a second hardness value, the second hardness value being greater than the first hardness value.

[0068] In some embodiments, the first outer lug portion is an underlying outer lug portion and the second outer lug portion is an overlying outer lug portion.

[0069] In some embodiments, the second lug portion is made from laminated layers of a second material.

[0070] In some embodiments, the second lug portion is pre-molded.

[0071] In some embodiments, the second lug portion is extruded.

[0072] In some embodiments, each one of the plurality of first outer lug portions has a first longitudinal side and a second longitudinal side, and at least one of the first and second longitudinal sides defines an arcuate profile.

[0073] In some embodiments, at least some of the outer lugs are chevron-shaped.

[0074] In some embodiments, at least some of the plurality of outer lugs are longitudinally aligned with some of the plurality of inner lugs.

[0075] In some embodiments, the inner lugs are central drive lugs.

[0076] In some embodiments, the vehicle is a heavy vehicle.

[0077] In some embodiments, the endless track further comprises a plurality of longitudinal reinforcing members.

[0078] In some embodiments, the plurality of longitudinal strength members is one of a plurality of cables and a plurality of fabrics.

[0079] In some embodiments, the endless track further includes a plurality of inner lug reinforcing members, each one of the plurality of inner lug reinforcing members being disposed within one of the plurality of inner lugs.

[0080] According to another aspect of the present technology, there is provided a track system for a heavy vehicle, the track system including a frame, a plurality of wheel assemblies connected to the frame, and an endless track according to the above aspect or according to one or more of the above aspect and embodiment, surrounding the plurality of wheel assemblies.

[0081] According to another aspect of the present technology, an endless track for a vehicle track system is provided. The endless track includes a carcass, a plurality of inner lugs, and a plurality of outer lugs. The carcass has an inner surface and an outer surface opposite the inner surface. The plurality of inner lugs extend from the inner surface and are spaced apart longitudinally along a longitudinal center plane of the endless track. The plurality of outer lugs extend from the outer surface and are spaced apart longitudinally along the outer surface. Each one of the plurality of outer lugs includes a first outer lug portion extending from the outer surface to a bond height. The first outer lug portion has a bond interface at the bond height. The first outer lug portion is made from a first material and includes an outer lug reinforcement member. Also, each one of the plurality of outer lugs includes a second outer lug portion extending from the bond interface of the first outer lug portion to the outer lug height. The second outer lug portion has an engagement surface at the outer lug height. The second outer lug portion is made from a second material different from the first material. The outer lug stiffeners have an outer lug stiffener height and a ratio of the outer lug stiffener height to the bond height is at least about 0.75.

[0082] In the context of this specification, unless expressly provided otherwise, the words "first", "second", "third", etc. are used as adjectives only for the purpose of making it possible to distinguish the nouns which they modify from one another, and not for the purpose of describing any particular relationship between those nouns.

[0083] It must be noted that as used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise.

[0084] As used herein, the term "about" in the context of a given value or range refers to a value or range that is within 20%, preferably within 15%, preferably within 10%, and more preferably within 5% of the given value or range.

[0085] As used herein, the term "and / or" should be interpreted as a specific disclosure of each of the two specified features or components with or without the other. For example, "A and / or B" should be interpreted as a specific disclosure of (i) A, (ii) B, and (iii) each of A and B, as if each were individually set forth herein.

[0086] For purposes of this application, terms related to spatial orientation when referring to the track system and its associated components (e.g., "vertical," "horizontal," "forward," "backward," "left," "right," "upward," and "downward," etc.) are as they would be understood by a driver of a vehicle to which the track system is connected, where the driver is seated in the vehicle in an upright driving position, the vehicle is steered in a straight ahead direction, and is stationary on a flat, level ground.

[0087] Implementations of the present technology will each have at least one of the above-mentioned objects and / or aspects, but not necessarily all of them. It should be understood that some aspects of the present technology resulting from attempting to achieve the above-mentioned object may not satisfy that object and / or may satisfy other objects not specifically set forth herein.

[0088] Additional and / or alternative features, aspects, and advantages of implementations of the present technology will become apparent from the following description, the accompanying drawings, and the appended claims.

[0089] For a better understanding of the present technology, as well as other aspects and further features thereof, reference is made to the following description, which should be used in conjunction with the accompanying drawings, in which: [Brief description of the drawings]

[0090] [Figure 1A] FIG. 1 is a perspective view of a military vehicle having a track system, each having an endless track in accordance with an embodiment of the present technique; [Figure 1B] FIG. 1 is a right side view of a harvester having a track system, each having an endless track, in accordance with an embodiment of the present technique. [Figure 2A] FIG. 1B is a perspective view of a portion of the endless track of FIG. 1A. [Figure 2B] FIG. 2B is a perspective view of a section of a portion of the endless track of FIG. 2A, with part of the endless track shown in transparency; [Diagram 3] 2B is a schematic cross-sectional view of a portion of the endless track section of FIG. 2A taken across the longitudinal centre plane of the endless track section; FIG. [Figure 4] FIG. 4 is an enlarged view of an endless track portion of FIG. [Diagram 5] FIG. 2 is an enlarged view of a portion of an alternative embodiment of the endless track. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0091] The present disclosure is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the drawings. The present disclosure is capable of other embodiments and of being practiced or carried out in various ways. Moreover, the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting. The use of "including," "comprising," "having," "containing," "involving," and variations thereof herein means the inclusion of the items listed thereafter and, optionally, additional items. In the following description, like reference numerals refer to like elements.

[0092] The present technology relates to various embodiments of an endless track, which will be described with reference to a track system. The endless track according to the embodiments of the present technology includes a carcass, an inner lug, and an outer lug. The outer lug is optimized to increase the durability of the endless track. In particular, the outer lug has two lug portions made of two different materials, respectively, the lower lug portion being more elastically deformable than the upper lug portion, and the upper lug portion having a higher hardness than the lower lug portion. Moreover, the outer lugs are spaced and shaped in a manner that enhances the durability of the endless track.

[0093] Referring to FIG. 1A, the present technology will be described with reference to a military vehicle 20, which is a heavy vehicle. Specifically, the military vehicle 20 is an armored personnel carrier 20, and its forward direction is indicated by arrow 21. The military vehicle 20 has track systems 30 on either side thereof. Each of the track systems 30 has a sprocket wheel assembly 32 mounted at the forward end of the military vehicle 20, an idler wheel assembly 34 mounted at the rear end of the military vehicle 20, and five road wheel assemblies 36 mounted along the length of the military vehicle 20. It is contemplated that there may be more or less than five road wheel assemblies. Each of the track systems 30 also includes an endless track 100, which surrounds the sprocket wheel assembly 32, the idler wheel assembly 34, and the road wheel assembly 36.

[0094] The sprocket wheel assembly 32 is generally configured to engage the endless track 100 and transfer power from an engine (not shown) of the military vehicle 20 to the endless track 100. The idler wheel assembly 34 is configured to adjust tension and guide the endless track 100. The road wheel assembly 36 is generally configured to guide the lower running portion of the endless track 100 that engages the ground during use.

[0095] It is contemplated that the present technology may be used with vehicles other than military vehicles. For example, the present technology may be used with other agricultural vehicles (e.g., tractors, etc.), industrial vehicles (e.g., bulldozers, skid steer loaders, excavators, and compact track loaders, etc.), military vehicles (e.g., tanks, etc.), utility vehicles, exploration vehicles, and / or all-terrain vehicles (e.g., side-by-side or utility terrain vehicles, etc.). It is also contemplated that the present technology may be used with trailers or other non-motorized vehicles.

[0096] For example, referring to FIG. 1B, the present technology is shown for use with a harvester 40. The harvester 40 has a frame 42 that houses an engine 44 (shown diagrammatically). The harvester 40 also has left and right rear wheels 46 and left and right track systems 50 (only the right rear wheel 46 and the right track system 50 are shown in the accompanying figures). It is contemplated that in some embodiments, the harvester 40 may have more than two track systems. The engine 44 is operably connected to the left and right track systems 50. It is contemplated that in some embodiments, the engine 44 may be operably connected to the rear wheels 46.

[0097] 1B, the track system 50 includes a sprocket wheel assembly 60 that is operatively connected to an axle (not shown) of the harvester 40 such that as the axle rotates, the sprocket wheel assembly 60 also rotates, thereby driving the track system 50. In some embodiments, it is contemplated that the sprocket wheel assembly 60 may be configured to connect to a non-driven axle of the vehicle. The sprocket wheel assembly 60 defines a plurality of recesses 62 circumferentially about a periphery of the sprocket wheel assembly 60. The recesses 62 are configured to engage lugs 104 provided on an inner surface 110 of the endless track 101.

[0098] The track system also includes a frame 70 that is operatively connected to the sprocket wheel assembly 60, the frame 70 disposed laterally inward from the sprocket wheel assembly 60. In other embodiments, it is contemplated that the frame 70 may be disposed laterally outward relative to the sprocket wheel assembly 60. In other embodiments, the frame 70 may be laterally aligned with the sprocket wheel assembly 60. The frame 70 includes a main frame 72, a leading frame member 74, and a trailing frame member 76, where the leading frame member 74 and the trailing frame member 76 are pivotally connected to the main frame 72. It is understood that the frame 70 may vary from the above description without departing from the scope of the present technology. For example, in some embodiments, the frame 70 may be configured to not have any pivotally connected members.

[0099] The track system 50 further includes a wheel assembly that, in addition to the sprocket wheel assembly 60, includes a front idler wheel assembly 80, a rear idler wheel assembly 82, and three support wheel assemblies 84a, 84b, 84c that are longitudinally disposed between the front idler wheel assembly 80 and the rear idler wheel assembly 82. It is contemplated that in some embodiments, the track system 50 can have more or less than three support wheel assemblies.

[0100] Front idler wheel assembly 80 and support wheel assembly 84a are rotatably connected to leading frame member 74. Support wheel assemblies 84b, 84c are connected to form a tandem 86, which is pivotally connected to trailing frame member 76. Rear idler wheel assembly 82 is also rotatably connected to trailing frame member 76. Thus, track system 50 is able to adapt to some extent to obstacles encountered.

[0101] Each one of the front and rear idler wheel assemblies 80, 82 and support wheel assemblies 84a, 84b, 84c has two laterally spaced wheels such that each one of the front and rear idler wheel assemblies 80, 82 and support wheel assemblies 84a, 84b, 84c has left and right wheels (only the right wheel of each of the wheel assemblies is shown in FIG. 1B). In some embodiments, it is contemplated that one or more of the front and rear idler wheel assemblies 80, 82 and support wheel assemblies 84a, 84b, 84c can be configured to have a single wheel or three or more wheels laterally.

[0102] It is contemplated that in some embodiments, the track system 50 may include a tensioner configured to adjust the tension of the endless track 101.

[0103] 2A, 2B, 3 and 4, a first embodiment of an endless track 100, 101 will now be described. Since the endless tracks 100, 101 are similar, only the endless track 100 will now be described with reference to the military vehicle 20. The endless track 100 includes a carcass 102, a plurality of inner lugs 104, and a plurality of outer lugs 106.

[0104] The carcass 102 has an inner surface 110 that is engageable with the sprocket wheel assembly 32, the idler wheel assembly 34, and the road wheel assembly 36 (or, in the case of the endless track 101, with the front and rear idler wheel assemblies 80, 82 and the support wheel assemblies 84a, 84b, 84c). The carcass 102 also has an outer surface 112 that is opposite the inner surface 110 and that is engageable with a ground surface. Embedded within the carcass 102 between the inner surface 110 and the outer surface 112, the endless track 100 has a reinforcing cable 114 extending longitudinally therethrough and a reinforcing sheet 116 that surrounds the reinforcing cable 114. Other configurations are contemplated. For example, in some cases, the reinforcing sheet 116 can simply be disposed above and below the reinforcing cable 114. In other embodiments, it is contemplated that the extending reinforcing cables 114 and reinforcing sheets 116 can include other longitudinal reinforcing members. In some embodiments, it is contemplated that the reinforcing sheets 116 can be omitted. The reinforcing cables and sheets 114, 116 are generally configured to distribute loads along the carcass and / or limit longitudinal stretch of the carcass 102. In other words, the reinforcing cables and sheets 114, 116 can reinforce the endless track 100, which can help reduce the likelihood that the endless track 100 will be torn and / or damaged, thereby extending the life of the endless track 100.

[0105] In some embodiments, the carcass 102 is made from an elastomeric material. It is contemplated that the elastomeric material can be a polymeric material such as, for example, rubber. Thus, the carcass 102 is flexible, thereby allowing it to conform to obstacles and / or components of the track system 30 (e.g., the sprocket wheel assembly 32, etc.). Specifically, the carcass 102 has a plurality of flexible portions 118 extending between the inner surface 110 and the outer surface 112. Each one of the plurality of flexible portions 118 is longitudinally disposed between two adjacent inner lugs 104 and between two adjacent outer lugs 106 (the inner and outer lugs 104, 106 are generally longitudinally aligned). As shown in FIGS. 3 and 4, each one of the flexible portions 118 has a smaller cross-sectional height (i.e., less material) than other locations along the endless track 100. When overcoming an obstacle and / or fitting onto one of the wheel assemblies, the endless track 100 is able to deform due to its elastic nature, particularly in the flexible portion 118 .

[0106] Focusing first on the inner surface 110, the endless track 100 includes a plurality of inner lugs 104 that are configured to engage the sprocket wheel assembly 32. The inner lugs 104 extend from the inner surface 110 and are spaced apart longitudinally along a longitudinal center plane of the endless track 100. In this embodiment, the inner lugs 104 are central drive lugs such that the inner lugs 104 are generally laterally centered relative to the endless track 100. In other embodiments, it is contemplated that the inner lugs 104 may be provided in two laterally spaced sets of longitudinally spaced lugs. In some embodiments, the inner lugs 104 may also act as guide lugs. In this embodiment, each one of the plurality of inner lugs 104 has a reinforcing member 124 embedded therein to strengthen the respective inner lug 104, which reduces the likelihood that the lug 104 will be damaged. Additionally, the presence of the reinforcing member 124 can also rigidify the lugs 104, which can help reduce "tooth skipping" during engagement with the sprocket wheel assembly 32. Indeed, the inner lugs 104 are subject to high loads when engaged with the sprocket wheel assembly 32, especially in the case of heavy vehicles. In some embodiments, the reinforcing member 124 can be omitted. It should be noted that in certain cases, the shape of the reinforcing member 124 can influence the shape of the inner lugs 104, such that the reinforcing member 124 and the inner lugs 104 have similar shapes.

[0107] The inner surface 110 also has lateral lugs 105 disposed on either lateral side of the endless track 100. The lateral lugs 105 extending from the inner surface 110 are spaced longitudinally along a longitudinal center plane of the endless track 100.

[0108] 2A, 2B, 3, and 4, the focus will now be shifted to the outer surface 112. The endless track 100 includes a plurality of outer lugs 106 that are engageable with a ground surface. As will be explained in more detail below, the shape of the outer lugs 106 can vary from one embodiment to another without departing from the scope of the present technology. In some embodiments, the shape of the outer lugs 106 can vary depending on the ground surface that is to be engaged by the endless track 100. The outer lugs 106 extend from the outer surface 112 away from the outer surface 112 and are longitudinally spaced apart along the longitudinal center plane of the endless track 100. In this embodiment, each one of the outer lugs 106 is longitudinally aligned with one of the inner lugs 104. However, it is contemplated that in some embodiments, the inner and outer lugs 104, 106 can be longitudinally offset from one another. Additionally, each one of the outer lugs 106 extends laterally along the entire width of the endless track 100. It is contemplated that in some embodiments, the outer lugs 106 may extend along only a portion of the width of the endless track 100. In some embodiments, the outer lugs 106 may have a varying width (e.g., one outer lug 106 is wider than another outer lug 106). In other embodiments, the shape of the outer lugs 106 may vary. The spacing and width of the outer lugs 106 may vary depending on the type of ground surface on which the endless track 100 is to be used.

[0109] The outer lugs 106 will now be described in more detail, however, because the outer lugs 106 are similar to one another, only one outer lug 106 will be described herein.

[0110] The outer lug 106 has an underlying outer lug portion 120 and an overlying outer lug portion 122 extending from the underlying outer lug portion 120. This configuration of the underlying and overlying outer lug portions 120, 122 can increase the durability of the endless track 100, as will be explained below.

[0111] The underlying outer lug portion 120 is spaced from the outer surface 112 to the joint height H of the outer lug 106. J The interface 130 extends between the underlying outer lug portion 120 and the overlying outer lug portion 122 at a joint height H J In this embodiment, the mating interface 130 has two arcuate sections 130a, 130b and a generally horizontal section 130c extending therebetween. However, it is contemplated that in some embodiments of the endless track 100, i.e., in the endless track 100' shown in FIG. 5, the mating interface 130 can be one generally horizontal section. In other embodiments, it is contemplated that the mating interface 130 can be shaped differently.

[0112] The underlying outer lug portion 120 is made from a first elastomeric material having a first modulus of elasticity and a first hardness value. In this embodiment, the underlying outer lug portion 120 is pre-molded. In yet other embodiments, the underlying outer lug portion 120 can be extruded.

[0113] The upper outer lug portion 122 is spaced from the mating interface 130 by an outer lug height H OL and has an outer lug height H OL 1. The engaging surface 131 is for engaging the ground surface.

[0114] The overlying outer lug portion 122 is made from a second elastomeric material, the second elastomeric material having a second modulus of elasticity and a second hardness value. In this embodiment, the overlying outer lug portion 122 is made from multiple laminated layers of the second material. In other embodiments, the overlying outer lug portion 122 can be pre-molded. In yet other embodiments, the overlying outer lug portion 122 can be extruded.

[0115] The first and second elastomeric materials are different. The first and second elastic moduli and the first and second hardness values ​​are also different. In this embodiment, the first elastomeric material is more elastically deformable than the second elastomeric material, which has a higher hardness than the first elastomeric material. As such, the overlying outer lug portion 122 (the portion of the outer lug 106 that engages the ground) remains hard, which can enhance resistance to fracturing (e.g., cracking). On the other hand, the underlying outer lug portion 120 (the portion of the outer lug 106 that deforms to some extent due to the loads experienced by the outer lug 106 and that deforms to conform to the shape of the components of the track system 30, such as the sprocket wheel assembly 32) is more elastically deformable, which can enhance the degree to which the endless track 100 can flex around components and / or obstacles. Thus, the durability of the endless track 100 as a whole is increased.

[0116] The lower and upper outer lug portions 120, 122 are spaced apart by an outer lug height H OL Joint height H J The ratio of the outer lug height H to the outer lug portion 120 is configured to allow for an increased amount of the first elastomeric material to be used at the base of the underlying outer lug portion 120, which can enhance the durability of the endless track 100. OL Joint height H JThe selected locations of the outer lug height H can enhance the durability of the endless track 100 by increasing the amount of the first elastomeric material at locations where the endless track 100 flexes (e.g., deforms). In some embodiments, the outer lug height H OL Joint height H J In some embodiments, the ratio of the outer lug height H OL Joint height H J In some embodiments, the ratio of the outer lug height H OL Joint height H J In some embodiments, the ratio of the outer lug height H OL Joint height H J In some embodiments, the ratio of the outer lug height H OL Joint height H J In some embodiments, the ratio of the outer lug height H OL Joint height H J In some embodiments, the ratio of the outer lug height H OL Joint height H J The ratio is greater than about 0.7.

[0117] Returning to the underlying outer lug portion 120, the underlying outer lug portion 120 has a forward base 132a and an aft base 132b. The forward and aft bases 132a, 132b are rounded such that the underlying outer lug portion 120 defines a base radius. The base radii of the forward and aft bases 132a, 132b are substantially identical. The base radius of the forward base 132a has a forward virtual center 134a and the base radius of the aft base 132b has a rearward virtual center 134b. The multiple outer lugs 106 are spaced and configured such that the forward virtual center 134a of one of the outer lugs 106 coincides with the rearward virtual center 134b of an adjacent outer lug 106. A larger base radius can help increase the lifespan of the endless track 100. In particular, a larger base radius induces less deformation and less stress concentration as the endless track 100 bends around the flexible portion 118. The deformation is compressive deformation, and a larger base radius increases the material (e.g., area) that bears the compressive load, thereby reducing the deformation. In other words, this configuration can, in certain cases, increase the amount of the first elastomeric material in the anterior and posterior bases 132a, 132b while providing sufficient flexibility. It is contemplated that in some embodiments, the anterior virtual center 134a of one lateral lug 106 can be offset from the posterior virtual center 134b of the lateral lug 106 adjacent thereto. In other embodiments, the anterior and posterior base members 132a, 132b can be non-rounded.

[0118] Additionally, the front side 126a and the rear side 126b of the outer lug 106 are tapered and have a partially arcuate profile. In this embodiment, the shape of the outer lug 106 is influenced by the presence and shape of the outer lug reinforcing member 140 disposed therein. However, in the endless track 100' shown in FIG. 5, there is no outer lug reinforcing member 140 disposed therein. As such, the shape of the outer lug 106 can be varied to accommodate various ground surfaces. For example, in the endless track 100', due to the absence of the outer lug reinforcing member 140, the outer lug 106 can be formed in a chevron shape, which can enhance traction in some cases. In other words, the shape of the outer lug 106 is no longer limited by the outer lug reinforcing member 140.

[0119] The outer lugs 106 are tapered and have a draft angle α 1 is defined by the protrusion of the forward side 126a and the engagement surface 131, and the draft angle α 2 is defined by the protrusion of the rear side 126b and the engagement surface 131. In this embodiment, the draft angle α 1、 α 2 are substantially the same, but in other embodiments may be different. In some embodiments, the draft angle α 1、 α 2 increases the amount of the first elastomeric material in the front and rear bases 132a, 132b, which can be more easily deformed, as described above, and therefore, which can increase the life of the endless track 100. In some embodiments, the draft angle α 1、 α 2 is about 9 degrees. In some embodiments, the draft angle α 1、 α 2 can be greater than about 8 degrees. In other embodiments, the draft angle α 1、 α 2can be greater than about 7 degrees. In other embodiments, the draft angle α 1、 α 2 For example, in some embodiments, the draft angle α can be greater than about 6 degrees. 1、 α 2 can be about 10 degrees.

[0120] In this embodiment, the endless track 100 includes a plurality of outer lug reinforcement members 140, where each one of the plurality of outer lug reinforcement members 140 is disposed within one of the plurality of outer lugs 106. Because the plurality of outer lug reinforcement members 140 are similar, only one outer lug reinforcement member 140 will be described herein.

[0121] The outer lug reinforcing member 140 is disposed vertically below the neutral axis 103 of the carcass 102 in the outer lug portion 120 below the outer lug 106. In some embodiments, the outer lug reinforcing member 140 is embedded in the outer lug portion 120 below the outer lug 106. The outer lug reinforcing member 140 is surrounded by a connecting membrane 141, which is wrapped by a fabric 142. The connecting membrane 141 can help connect the fabric 142 to the outer lug reinforcing member 140. In some embodiments, the outer lug reinforcing member 140 can be only partially wrapped by the fabric 142. In some embodiments, the fabric 142 is a coating fabric. In other embodiments, the fabric 142 is a corrugated fabric. It is contemplated that in some embodiments, the fabric 142 and / or the connecting membrane 141 can be omitted. In some embodiments, omitting the fabric 142 can increase the lifespan of the endless track 100. The reason is that the fabric 142 may be more rigid than the carcass 102, generating higher deformations, and / or the fabric 142 may separate from the carcass 102 and / or the outer lug reinforcement member 140, thereby causing problems. In embodiments in which the fabric 142 is omitted, the connecting membrane 141 may help connect the outer lug reinforcement member 140 to the underlying outer lug portion 120. In some embodiments, the connecting membrane 141 may be a connecting elastomer. Additionally, the outer lug reinforcement member 140 is made of a composite material. It is contemplated that the outer lug reinforcement member 140 may be made of another material (e.g., steel, etc.).

[0122] The outer lug stiffening member 140 is generally disposed at the longitudinal center of the outer lug 106, with the outer lug stiffening member 140 extending along the entire width of the outer lug 106. It is contemplated that in some embodiments, the outer lug stiffening member 140 may extend along only a portion of the width of the outer lug 106.

[0123] The outer lug reinforcement member 140 has a prism shape. In certain cases, the outer lug reinforcement member 140 has a hexagonal shape. Specifically, the outer lug reinforcement member 140 has a rectangular shape. It is contemplated that in other embodiments, the outer lug reinforcement member 140 can have another shape. For example, in some embodiments, the outer lug reinforcement member 140 can have rounded corners to reduce stress concentrations, which can extend the life of the endless track 100. Specifically, the rounded corners of the outer lug reinforcement member 140 can reduce the likelihood of developing a vertical crack therein. In some embodiments, an outer lug reinforcement member 140 with rounded corners can be approximately two times less likely to develop a vertical crack therein when compared to an outer lug reinforcement member 140 with standard edges. Additionally, an outer lug reinforcement member 140 with rounded corners may be approximately 8 to 10 times less likely to break when compared to an outer lug reinforcement member 140 with standard edges. The outer lug reinforcement member 140 has a reinforcement member height H RM and the length of the reinforcing member L RM In this particular embodiment, due to the rectangular shape of the outer lug reinforcement members 140, the length of the outer lug reinforcement members 140 is equal to the reinforcement member height H RM , with the maximum length being at the vertical center of the outer lug reinforcement member 140. For purposes of this specification, reference will be made to the lower and upper ends of the outer lug reinforcement member 140, where the lower end is the end closer to the outer surface 112 and the upper end is the end at the bond height H J The outer lug reinforcement member 140 has a lower reinforcement member length LLRM At its vertical center, the central reinforcing member has a length L CRM At its upper end, the upper reinforcing member has a length L URM In this embodiment, the lower reinforcing member has a length L LRM is the length of the upper reinforcing member L URM In some embodiments, the lower reinforcing member length L LRM and the length of the upper reinforcement member L URM is about 46 mm, and the central reinforcing member length L CRM is about 50 mm. The length of the lower reinforcing member L LRM is the length of the upper reinforcing member L URM It is contemplated that the lower reinforcing member length L may be different from the lower reinforcing member length L in some embodiments. LRM , length of central reinforcing member L CRM , and the upper reinforcing member length L URM Any one of the lower reinforcing member lengths L can be at most about 50 millimeters. LRM , length of central reinforcing member L CRM , and the upper reinforcing member length L URM Any one of can be about 45 millimeters, 50 millimeters, about 51 millimeters, or about 52 millimeters.

[0124] The length of the outer lug reinforcement member 140 is optimized with reference to the total length of the outer lug 106 in order to increase the flexibility of the flexible portion 118 and thus the flexibility of the endless track 100. As such, the rolling deformation and thus the chance of crack formation is reduced, since the endless track 100 bends more easily around components and / or obstacles. Also, by increasing the amount of the first elastomeric material, the durability of the endless track 100 is increased. With reference to the outer lug reinforcement member 140, the outer lug 106 is extended at the lower end of the outer lug reinforcement member 140 by a lower outer lug length L LOLAt the vertical center of the outer lug reinforcement member 140, the central outer lug length L COL At the upper end of the outer lug reinforcement member 140, the upper outer lug length L UOL In some embodiments, the upper end of the outer lug reinforcement member 140 can be vertically above the outer surface 112 and have an upper outer lug length L UOL can correspond to the length of the outer lug 106. In some embodiments, the lower outer lug length L LOL can be about 125 millimeters. In some embodiments, the lower outer lug length L LOL can be about 123 millimeters. In some embodiments, the lower outer lug length L LOL can be about 120 millimeters. In some embodiments, the lower outer lug length L LOL can be about 115 millimeters. In some embodiments, the lower outer lug length L LOL can be about 110 millimeters. In some embodiments, the lower outer lug length L LOL can be about 105 millimeters. In some embodiments, the central outer lug length L COL can be about 101 millimeters. In some embodiments, the upper outer lug length L UOL The lower reinforcing member length L may be approximately 99 millimeters. Other dimensions are contemplated. LRM and the lower outer lug length L LOL In some embodiments, the ratio between the lower reinforcement member length L LRM and the lower outer lug length L LOL The ratio between the central reinforcing member length L and the central reinforcing member length L can be about 0.36, about 0.35, about 0.38, or about 0.39. CRM and the center outer lug length L COL In some embodiments, the ratio between the central reinforcing member length L CRM and the center outer lug length L COLThe ratio between the upper reinforcing member length L and the upper reinforcing member length L may be about 0.49, about 0.48, about 0.51, or about 0.52. URM and upper outer lug length L UOL In some embodiments, the ratio between the upper reinforcing member length L URM and upper outer lug length L UOL The ratio between the central outer lug length L and the central outer lug length L can be about 0.45, about 0.44, about 0.47, or about 0.48. In some embodiments, when calculating the ratios discussed above, the length measurements can include the connecting membrane 141 and / or the fabric 142. In some embodiments, to minimize rolling deformation at the anterior and posterior bases 132a, 132b, the central outer lug length L COL and the distance between two adjacent teeth (i.e., a large draft angle), and the central reinforcement length L CRM and the center outer lug length L COL A small ratio between (i.e., smaller reinforcing members 124) is desired. That being said, the reinforcing members 124 must be strong enough to withstand the loads of the vehicle. Thus, the reinforcing members 124 are sized to be large enough to withstand the loads, but not so large that they reduce the flexibility of the endless track 100.

[0125] Reinforcement member height H RM Regarding the outer lug reinforcement member 140, the outer lug reinforcement member 140 and the joint height H J 2. To increase the durability of the endless track 100 by increasing the amount of second material (i.e., the material of the overlying lug portion 122) between the joint height H J By increasing the amount of the second material, the durability of the profile of the outer lug 106 is increased.

[0126] Therefore, the joint height H J Reinforcement member height H RM In another embodiment, the ratio of the junction height H JReinforcement member height H RM In another embodiment, the ratio of the junction height H J Reinforcement member height H RM In another embodiment, the ratio of the junction height H J Reinforcement member height H RM The ratio is approximately 0.95.

[0127] While each of the features described above will by itself enhance the durability of the endless track 100 (i.e. increase the lifespan of the endless track 100), a combination of the features described above will have a synergistic effect, in other words, the combination will have an impact on the lifespan of the endless track 100 that is greater than the sum of their parts.

[0128] (Example) The following examples are provided to illustrate the practice of various embodiments of the present disclosure, and are not intended to limit or define the entire scope of the disclosure.

[0129] Example 1 Endless Track Rating An endless track was prepared and its characteristics were evaluated. 1、 α 2 An endless track according to one embodiment of the present technology having a draft angle of 9 degrees, α 1、 α 2It was determined that the presence of the first elastomeric material contributed to increasing the durability of the endless track by about 103%. It was shown that adjusting the length of the outer lug reinforcement member 140 could increase the durability of the endless track by about 21% when compared to an endless track in which the length of the outer lug reinforcement member 140 was not optimized to increase the amount of the first elastomeric material. It was shown that the alignment of the virtual centers of the base radii of two adjacent outer lugs increased the durability of the endless track by about 34% when compared to an endless track in which the virtual centers of the base radii of two adjacent outer lugs were not aligned. It was shown that the combination of the above features contributed to increasing the overall durability of the endless track by about 220% when compared to an endless track without these combinations of features.

[0130] Modifications and improvements to the above-described embodiments of the invention may become apparent to those skilled in the art. The foregoing description is intended to be illustrative rather than limiting. Accordingly, the scope of the invention is intended to be limited only by the appended claims. [Explanation of symbols]

[0131] 20 Military Vehicles 21 Arrow 30 Track System 32 Sprocket wheel assembly 34 Idler wheel assembly 36 Road Wheel Assembly 40 Harvester 42 Frames 44 Engine 46 Rear Wheel 50 Track System 60 Sprocket wheel assembly 62 Recess 70 frames 72 Mainframe 74 Leading frame member 76 Trailing frame member 80 Front idler wheel assembly 82 Rear idler wheel assembly 84a, 84b, 84c Support wheel assembly 86 Tandem 100 Endless Tracks 100' Endless Track 101 Endless Track 102 Carcass 103 Neutral axis 104 Inner lug 105 Horizontal lugs 106 Outer lug 106' outer lug 110 Inner surface 112 Outer surface 114 Reinforcement Cable 116 Reinforcement sheet 118 Flexible part 120 Lower outer lug part 122 Upper outer lug part 124 Reinforcement member 126a Front side 126b Rear side 130 Bonding Interface 130a Circular section 130b Circular section 130c Generally horizontal sections 131 Engagement surface 132a Front Base 132b Rear Base 134a Front virtual center 134b Rear virtual center 140 Outer lug reinforcement member 141 Connecting Membrane 142 Fabric H J Joint Height H OL Outer lug height H RM Reinforcement member height L COL Center outer lug length L CRM Length of central reinforcement member L LOL Lower outer lug length L LRM Lower reinforcement length L RM Reinforcement member length L UOL Upper outer lug length L URM Upper reinforcement length α 1 Draft Angle α 2 Draft Angle

Claims

1. 1. An endless track for a track system of a vehicle, the endless track comprising: a carcass having an inner surface and an outer surface opposite the inner surface; a plurality of inner lugs extending from the inner surface and spaced apart longitudinally along a longitudinal center plane of the endless track; a plurality of outer lugs extending from and spaced longitudinally along the outer surface; Including, Each one of the plurality of outer lugs comprises: a first outer lug portion extending from the outer surface to a bond height, the first outer lug portion defining a base radius and having a bond interface at the bond height, the first outer lug portion being made from a first material and including an outer lug reinforcement member; a second outer lug portion extending from the joining interface of the first outer lug portion to an outer lug height, the second outer lug portion having an engagement surface at the outer lug height, the second outer lug portion being made from a second material different from the first material; a draft angle defined by a longitudinal side of one of the plurality of outer lugs and a protrusion of the engagement surface of the one of the plurality of outer lugs; Including, endless tracks.

2. 2. The endless track of claim 1, wherein the outer lug reinforcement members have an outer lug reinforcement member height, and a ratio of the outer lug reinforcement member height to the bond height is at least about 0.

75.

3. 3. The endless track of claim 2, wherein the ratio of the outer lug reinforcement member height to the bond height is at least about 0.

8.

4. 3. The endless track of claim 2, wherein the ratio of the outer lug reinforcement member height to the bond height is at least about 0.

85.

5. 3. The endless track of claim 2, wherein the ratio of the outer lug reinforcement member height to the bond height is at least about 0.

90.

6. 3. The endless track of claim 2, wherein the ratio of the outer lug reinforcement member height to the bond height is at least about 0.

95.

7. 7. An endless track according to any one of the preceding claims, wherein the ratio of the joint height to the outer lug height is about 0.

5.

8. 7. An endless track according to any one of the preceding claims, wherein the ratio of the joint height to the outer lug height is about 2 / 3.

9. each one of the plurality of outer lugs has a first outer lug length measured generally parallel to the longitudinal center plane of the endless track at a vertical center of the outer lug reinforcement member; each one of the plurality of outer lug reinforcements has a first outer lug reinforcement length at its vertical center measured generally parallel to the longitudinal center plane of the endless track; 9. The endless track of claim 1, wherein the ratio of the first outer lug length to the first outer lug reinforcement member length is about 0.

47.

10. each one of the plurality of outer lugs has a second outer lug length measured generally parallel to the longitudinal center plane of the endless track at a first end of the outer lug reinforcement member; each one of the plurality of outer lug reinforcements has a second outer lug reinforcement length measured generally parallel to the longitudinal center plane of the endless track at the first end of the outer lug reinforcement; 10. The endless track of claim 9, wherein a ratio of the second outer lug length to the second outer lug reinforcement member length is about 0.

41.

11. each one of the plurality of outer lugs has a third outer lug length measured generally parallel to the longitudinal center plane of the endless track at a second end of the outer lug reinforcement member; each one of the plurality of outer lug reinforcements has a third outer lug reinforcement length measured generally parallel to the longitudinal center plane of the endless track at the second end of the outer lug reinforcement; 11. The endless track of claim 10, wherein a ratio of the third outer lug length to the outer lug reinforcement member length is about 0.

45.

12. 12. An endless track according to any one of claims 9 to 11, wherein the outer lug reinforcement members have a length of at most 50 mm.

13. 12. An endless track according to any one of claims 9 to 11, wherein the outer lug reinforcement members have a length of at most 45 mm.

14. 14. The endless track according to any one of the preceding claims, wherein the outer lug reinforcement members are made from a composite material.

15. 15. An endless track according to any one of the preceding claims, wherein the outer lug reinforcement members are at least partially encased in fabric.

16. 16. The endless track of claim 1 , wherein the cross-sectional profile of the outer lug reinforcement members taken along the longitudinal centre plane of the endless track has a generally hexagonal shape.

17. 16. The endless track of claim 1 , wherein the cross-sectional profile of the outer lug reinforcement members along the longitudinal centre plane of the endless track has a generally rectangular shape.

18. 18. The endless track of claim 1, wherein the draft angle is greater than about 6 degrees.

19. 18. The endless track of claim 1 , wherein the draft angle is greater than about 8 degrees.

20. 18. The endless track of any one of claims 1 to 17, wherein the draft angle is about 9 degrees.

21. 21. The endless track of claim 1, wherein the virtual center of the base radius of one of the plurality of outer lugs coincides with the virtual center of the base radius of another of the plurality of outer lugs adjacent to said one of the plurality of outer lugs.

22. 22. The endless track of any one of claims 1 to 21, wherein the first material has a first modulus of elasticity and the second material has a second modulus of elasticity, the first modulus of elasticity being smaller than the second modulus of elasticity.

23. 23. The endless track of any one of claims 1 to 22, wherein the first material has a first hardness value and the second material has a second hardness value, the second hardness value being greater than the first hardness value.

24. 24. The endless track according to any one of claims 1 to 23, wherein the first outer lug portion is an underlying outer lug portion and the second outer lug portion is an overlying outer lug portion.

25. 25. An endless track according to any one of the preceding claims, wherein the second lug portions are made from laminated layers of the second material.

26. 25. An endless track according to any one of the preceding claims, wherein the second lug portion is pre-molded.

27. 25. An endless track according to any one of the preceding claims, wherein the second lug portions are extruded.

28. 28. The endless track of any one of claims 1 to 27, wherein the longitudinal sides are a first longitudinal side and a second longitudinal side, and at least one of the first and second longitudinal sides defines an at least partially arcuate profile.

29. 29. The endless track of any one of the preceding claims, wherein at least one of the plurality of outer lugs is shaped like a chevron.

30. 30. The endless track of claim 1, wherein at least some of the outer lugs are longitudinally aligned with some of the inner lugs.

31. 31. An endless track as claimed in any one of the preceding claims, wherein the inner lugs are central drive lugs.

32. 32. The endless track according to any one of claims 1 to 31, wherein the vehicle is a heavy vehicle.

33. 33. An endless track according to any one of the preceding claims, further comprising a plurality of longitudinal reinforcing members.

34. 34. The endless track of claim 33, wherein the plurality of longitudinal reinforcement members are at least one of a plurality of cables and a plurality of fabrics.

35. 35. The endless track of claim 1, further comprising a plurality of inner lug reinforcing members, each one of the plurality of inner lug reinforcing members being disposed within one of the plurality of inner lugs.

36. 1. A track system for a heavy vehicle, the track system comprising: Frame and; a plurality of wheel assemblies connected to the frame; an endless track according to any one of claims 1 to 35 surrounding the plurality of wheel assemblies; Including, the track system.

37. 1. An endless track for a track system of a vehicle, the endless track comprising: a carcass having an inner surface and an outer surface opposite the inner surface; a plurality of inner lugs extending from the inner surface and spaced apart longitudinally along the inner surface of the carcass; a plurality of outer lugs extending from and spaced longitudinally along the outer surface; Including, Each one of the plurality of outer lugs comprises: a first outer lug portion extending from the outer surface to a bond height, the first outer lug portion defining a base radius and having a bond interface at the bond height, the first outer lug portion being made from a first material; a second outer lug portion extending from the mating interface of the first outer lug portion to an outer lug height, the outer lug having an engagement surface at the outer lug height, the second outer lug portion being made from a second material different from the first material; Including, an endless track, wherein the virtual center of the base radius of one of the plurality of outer lugs coincides with the virtual center of the base radius of another of the plurality of outer lugs adjacent to the one of the plurality of outer lugs.

38. 38. The endless track of claim 37, further comprising a plurality of outer lug reinforcement members each having an outer lug reinforcement member height, one of the plurality of outer lug reinforcement members being disposed within one of the plurality of outer lugs.

39. 40. The endless track of claim 38, wherein a ratio of the outer lug reinforcement member height to the bond height is at least about 0.

75.

40. 40. The endless track of claim 39, wherein the ratio of the outer lug reinforcement member height to the bond height is at least about 0.

8.

41. 40. The endless track of claim 39, wherein the ratio of the outer lug reinforcement member height to the bond height is at least about 0.

85.

42. 40. The endless track of claim 39, wherein the ratio of the outer lug reinforcement member height to the bond height is at least about 0.

90.

43. 40. The endless track of claim 39, wherein the ratio of the outer lug reinforcement member height to the bond height is at least about 0.

95.

44. each one of the plurality of outer lugs has an outer lug length measured generally parallel to the longitudinal center plane of the endless track at a vertical center of the outer lug reinforcement member; each one of the plurality of outer lug reinforcements has an outer lug reinforcement length measured generally parallel to the longitudinal center plane of the endless track at the vertical center of the outer lug reinforcement; 44. An endless track according to any one of claims 38 to 43, wherein the ratio of the outer lug length to the outer lug reinforcement member length is about 0.

50.

45. each one of the plurality of outer lugs has a second outer lug length measured generally parallel to the longitudinal center plane of the endless track at a first end of the outer lug reinforcement member; each one of the plurality of outer lug reinforcements has a second outer lug reinforcement length measured generally parallel to the longitudinal center plane of the endless track at the first end of the outer lug reinforcement; 45. The endless track of claim 44, wherein a ratio of the second outer lug length to the second outer lug reinforcement member length is about 0.

46.

46. each one of the plurality of outer lugs has a third outer lug length measured generally parallel to the longitudinal center plane of the endless track at a second end of the outer lug reinforcement member; each one of the plurality of outer lug reinforcements has a third outer lug reinforcement length measured generally parallel to the longitudinal center plane of the endless track at the second end of the outer lug reinforcement; 46. ​​The endless track of claim 45, wherein a ratio of the third outer lug length to the outer lug reinforcement member length is about 0.

37.

47. 47. An endless track according to any one of claims 44 to 46, wherein the outer lug reinforcement members have a length of at most about 50 millimeters.

48. 48. An endless track according to any one of claims 38 to 47, wherein the outer lug reinforcement members are made from a composite material.

49. 49. An endless track according to any one of claims 38 to 48, wherein the outer lug reinforcement members are at least partially encased in fabric.

50. 50. The endless track of any one of claims 38 to 49, wherein a cross-section of the outer lug reinforcement members taken along the longitudinal centre plane of the endless track has a generally hexagonal shape.

51. 51. The endless track of any one of claims 38 to 50, wherein a cross-section of the outer lug reinforcement members taken along the longitudinal centre plane of the endless track has a generally rectangular shape.

52. 52. An endless track according to any one of claims 37 to 51, wherein the ratio of the joint height to the outer lug height is about 0.

5.

53. 53. An endless track according to any one of claims 37 to 52, wherein the ratio of the joint height to the outer lug height is about 2 / 3.

54. 54. The endless track of any one of claims 37 to 53, wherein each one of the plurality of outer lugs has a draft angle defined by a side of the one of the plurality of outer lugs and a protrusion of the engagement surface of the one of the plurality of outer lugs.

55. 55. The endless track of claim 54, wherein the draft angle is greater than about 6 degrees.

56. 55. The endless track of claim 54, wherein the draft angle is greater than about 8 degrees.

57. 55. The endless track of claim 54, wherein the draft angle is about 9 degrees.

58. 58. An endless track as claimed in any one of claims 37 to 57, wherein the first material has a first modulus of elasticity and the second material has a second modulus of elasticity, the first modulus of elasticity being smaller than the second modulus of elasticity.

59. 59. An endless track as claimed in any one of claims 37 to 58, wherein the first material has a first hardness value and the second material has a second hardness value, the second hardness value being greater than the first hardness value.

60. 60. An endless track according to any one of claims 37 to 59, wherein the first outer lug portion is an underlying outer lug portion and the second outer lug portion is an overlying outer lug portion.

61. 61. An endless track according to any one of claims 37 to 60, wherein the second lug portion is made from laminated layers of the second material.

62. 62. An endless track according to any one of claims 37 to 61, wherein the second lug portion is pre-molded.

63. 63. An endless track according to any one of claims 37 to 62, wherein the second lug portions are extruded.

64. 64. The endless track of any one of claims 37 to 63, wherein each one of the plurality of first outer lug portions has a first longitudinal side and a second longitudinal side, at least one of the first and second longitudinal sides defining an arcuate profile.

65. 65. An endless track as claimed in any one of claims 37 to 64, wherein at least some of the outer lugs of the plurality of outer lugs are shaped like chevrons.

66. 66. An endless track according to any one of claims 37 to 65, wherein at least some of the outer lugs are longitudinally aligned with some of the inner lugs.

67. 67. An endless track as claimed in any one of claims 37 to 66, wherein the inner lugs are central drive lugs.

68. 68. An endless track according to any one of claims 37 to 67, wherein the vehicle is a heavy vehicle.

69. 69. An endless track according to any one of claims 37 to 68, further comprising a plurality of longitudinal reinforcing members.

70. 70. The endless track of claim 69, wherein the plurality of longitudinal reinforcement members are one of a plurality of cables and a plurality of fabrics.

71. 71. The endless track of any one of claims 37 to 70, further comprising a plurality of inner lug reinforcing members, each one of the plurality of inner lug reinforcing members being disposed within one of the plurality of inner lugs.

72. 1. A track system for a heavy vehicle, the track system comprising: Frame and; a plurality of wheel assemblies connected to the frame; an endless track according to any one of claims 37 to 71 surrounding the plurality of wheel assemblies; Including, the track system.

73. 1. An endless track for a track system of a vehicle, the endless track comprising: a carcass having an inner surface and an outer surface opposite the inner surface; a plurality of inner lugs extending from the inner surface and spaced apart longitudinally along a longitudinal center plane of the endless track; a plurality of outer lugs extending from and spaced longitudinally along the outer surface; Including, Each one of the plurality of outer lugs comprises: a first outer lug portion extending from the outer surface to a bond height, the first outer lug portion having a bond interface at the bond height, the first outer lug portion being made from a first material, the first outer lug portion including an outer lug reinforcement member; a second outer lug portion extending from the joining interface of the first outer lug portion to an outer lug height, the second outer lug portion having an engagement surface at the outer lug height, the second outer lug portion being made from a second material different from the first material; Including, The endless track, wherein the outer lug stiffeners have an outer lug stiffener height, and a ratio of the outer lug stiffener height to the bond height is at least about 0.75.

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