Tracks, track systems and vehicles for use therewith

Abstract

An endless track, a track system, a kit, and a vehicle are provided. The carcass of the endless track includes a plurality of members disposed within the carcass, extending laterally within an inner portion of the carcass and spaced longitudinally from one another along the carcass. A given member from the plurality of members is configured to engage the wheel and has a guide portion extending radially inward from an inner surface of the inner portion of the carcass and a reinforcing portion located within the inner portion of the carcass and extending laterally between at least a first drive lug and at least a second drive lug. The reinforcing portion is configured to reinforce the inner portion of the carcass and support the weight of the wheel.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to U.S. Provisional Patent Application No. 63 / 414,367, filed October 7, 2022, and U.S. Provisional Patent Application No. 63 / 455,433, filed March 29, 2023, both of which are incorporated by reference in their entireties.

[0002] FIELD OF THE INVENTION This application relates generally to tracks, track systems, and vehicles having track systems. [Background technology]

[0003] Various vehicles, such as military or agricultural vehicles, are equipped with track assemblies instead of tires for various reasons, particularly to improve traction on various surfaces that are soft, slippery, and / or uneven (e.g., soil, mud, sand, ice, snow, etc.).

[0004] Traditionally, the track assemblies of some of these vehicles, particularly military vehicles, are equipped with metal tracks, which can be heavy, cumbersome to install, generate a lot of noise, and cause a lot of vibration, which can reduce the lifespan of some vehicle components and also negatively affect ride quality.

[0005] U.S. Patent No. 6,273,629, incorporated herein by reference, discloses a plurality of primary load distribution members that are transversely disposed within the carcass of a track assembly and longitudinally distributed so as to distribute at least a portion of the downward wheel force exerted by at least one of the wheels when the track is being pressed down onto the wheel-facing side of the carcass into the traction plane via flexing of the primary load distribution members.

[0006] Nevertheless, a track assembly that can mitigate the above-mentioned problems is desired. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] U.S. Patent No. 10,501,131 Summary of the Invention [Problem to be solved by the invention]

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

[0009] It should be noted that at least some conventional endless tracks have reinforcing members located within the outer portion of their carcasses. Developers of the present technology have recognized at least some drawbacks with such solutions.

[0010] In the context of the present technology, an endless track having an elastic carcass with a member having a guide portion and a reinforcing portion is provided. In some embodiments, the guide portion and the reinforcing portion can be integrally formed and / or manufactured from a rigid material. For example, a rigid member, as opposed to an elastic member, can be used to prevent and / or reduce deformation and / or bending of the member so that it retains its shape when a force is applied during operation. It is believed that the rigidity of an integrally formed member can be provided at least in part by its geometric configuration (e.g., a T-shaped member). It is also believed that the rigidity of an integrally formed member can be provided at least in part by the material (e.g., cast iron, titanium, steel, etc.) used to manufacture the member.

[0011] The reinforcing portion extends laterally within the inner portion of the carcass and is configured to reinforce the carcass and support the weight of the vehicle. It is believed that the reinforcing portion of the multiple members, and potentially the longitudinal cables, may be capable of supporting the weight of the vehicle by itself without requiring additional types of reinforcing members within the carcass for that purpose. The guide portion extends inward from the inner portion of the carcass and is configured to reinforce the guide lugs of the carcass. The guide portion may be exposed.

[0012] The reinforcing portion may be located within an inner portion of the carcass and, in a sense, "seat" on one or more layers of reinforcing cords. The reinforcing portion may or may not be in direct contact with the layers of reinforcing cords. It is believed that the reinforcing cords may provide longitudinal reinforcement to the carcass and the reinforcing portion may provide lateral reinforcement to the carcass.

[0013] It is believed that providing reinforcement in the inner portion of the carcass so that the reinforcement rests on the layer of reinforcing cords may avoid having reinforcing members in the outer portion of the carcass. It is believed that avoiding reinforcing members in the outer portion of the carcass may be beneficial because it reduces dimensional constraints on the shape, size, and pattern of the outer lugs of the carcass.

[0014] It is believed that providing a reinforcing portion within the inner portion of the carcass so that it rests on the layer of reinforcing cords may reduce wear on the carcass and / or the layer of reinforcing cords. Providing a reinforcing portion extending within the inner portion of the carcass provides a reinforcing barrier between the wheel assembly of the track system and the layer of reinforcing cords, helping to support and distribute the weight of the vehicle. It is believed that providing such a reinforcing barrier between the wheel assembly and the reinforcing cords may reduce the risk of the reinforcing cords migrating and / or becoming exposed within the carcass.

[0015] In some embodiments, developers have devised tracks with reduced widths of guide portions and / or guide lugs. For a given width of track, it is believed that having narrower guide lugs provides additional space for expanding one or more road wheel paths on the inner surface of the carcass. It is also believed that providing narrower guide lugs can aid in installing the track on a track system. Increasing the width of the road wheel path can result in increased lateral flexibility of the carcass, which is also believed to aid in installing the track on a track system.

[0016] It is believed that reducing the width of the guide portions and / or guide lugs may result in a relatively narrower track than conventional tracks used on a vehicle of a given weight. The developers also recognize that by locating the reinforcing members within the inner portion of the carcass, the shape, size, and / or pattern of the outer lugs may be more freely selected to provide the desired traction force for the track system. For example, such a carcass may be provided with relatively deeper and / or longer outer lugs than some conventional carcasses used on a vehicle of a given weight. In some embodiments, providing deeper and / or longer outer lugs may make it possible to compensate for the potential width reduction of the outer lugs.

[0017] It is believed that it may be desirable to reduce the width of the carcass for various performance metrics of the track system.

[0018] In some implementations of the present technology, the track may be designed based on a width requirement for a road wheel path on the inner surface of the carcass. In some cases, the width of the drive lugs may be predetermined, such that the width of the guide lugs may be determined as the difference between (i) the maximum allowable width of the carcass and (ii) the sum of the width of the road wheel path and the predetermined width of the drive lugs. In these implementations, the width requirement for the road wheel path may be determined based on the weight of the vehicle, the size of the wheels of the track system, and / or other performance metrics of the track system.

[0019] Developers designed the track with specific, pre-defined elements that allow for the narrowing of the guide lugs, and therefore the carcass itself. These elements are designed to reinforce the guide lugs (allowing for narrowing), reinforce the carcass, and support the weight of the vehicle.

[0020] In one implementation, the carcass may be designed for a vehicle weighing approximately 45 US tons. In this implementation, it may be desirable to increase the width of the road wheel path while maintaining the maximum allowable width of the carcass. For example, it may be desirable to increase the width of the road wheel path while maintaining an overall carcass width of 530 mm. Note that modifying the width of the drive lugs may not be desirable because it may affect one or more performance metrics of the track and / or track system. Therefore, in these embodiments, reducing the width of the guide lugs may provide additional space for increasing the width of the road wheel path. In this implementation, a carcass with a given member may allow, for example, the width of the guide lugs to be reduced from 65 mm to 35 mm.

[0021] In other implementations, it may be desirable to reduce the width of the carcass itself, as opposed to reducing the width of the road wheel path. In these implementations, once the width of the road wheel path is determined, a minimum guide lug width is selected for a given performance metric of the track and / or track system. For example, such an approach may be useful when designing tracks for use with relatively lighter vehicles (e.g., vehicles weighing 5 US tons rather than 45 US tons). In these cases, the carcass may be designed with narrow guide lugs and still be within the performance requirements of the track. Such tracks may also be cheaper to manufacture, as they may require relatively less material than conventional tracks.

[0022] It should be noted that while reducing the width of the carcass allows the width of the outer lugs of the carcass to be reduced, the developers have designed a carcass with certain elements located in the inner part of the carcass that allow the length of the outer lugs to be increased, thereby compensating for their reduced width.

[0023] In yet another implementation, it may be desirable to increase the width of the road wheel path by decreasing the width of the guide lugs to operate in combination with wider wheels. Note that increasing the width of the road wheel path to use wider wheels reduces carcass pressure and allows for the use of less expensive elastomeric materials to manufacture the carcass.

[0024] In a first broad aspect of the present technology, an endless track for a track system is provided. The endless track is engageable with a wheel of the track system. The endless track includes a polymer carcass. The carcass includes an outer portion having an outer surface for contacting the ground. The carcass includes an inner portion having an inner surface opposite the outer surface. A first lateral surface of the carcass extends between the inner surface and the outer surface, and a second lateral surface of the carcass opposite the first lateral surface extends between the inner surface and the outer surface. The carcass is configured to engage the wheel and includes a plurality of drive lugs disposed on the inner surface proximate the first and second lateral surfaces, the plurality of drive lugs extending radially inward from the inner surface and spaced longitudinally apart from one another along the inner surface. The plurality of drive lugs includes a first drive lug disposed proximate the first lateral surface and a second drive lug disposed proximate the second lateral surface. The carcass includes a plurality of members disposed within the carcass, the plurality of members extending laterally within an inner portion of the carcass and spaced longitudinally from one another along the carcass. A given member from the plurality of members is configured to engage the wheel and has a guide portion extending radially inward from an inner surface of the inner portion of the carcass and a reinforcing portion located within the inner portion of the carcass and extending laterally between at least a first drive lug and at least a second drive lug. The reinforcing portion is configured to reinforce the inner portion of the carcass and support the weight of the wheel.

[0025] In some embodiments of the endless track, the given member is a T-shaped member.

[0026] In some embodiments of the endless track, the guide portion and the reinforcement portion are integrally formed.

[0027] In some embodiments of the endless track, a given member is made from a rigid material.

[0028] In some embodiments of the endless track, the plurality of members are a plurality of first members. The endless track further includes at least one second member configured to reinforce the carcass, the at least one second member extending longitudinally along the length of the carcass within the inner portion and around the plurality of first members, such that the reinforcement portion is located between an inner surface of the inner portion and the at least one second member.

[0029] In some embodiments of the endless track, the at least one second member is a plurality of second members arranged in at least one layer of second members.

[0030] In some embodiments of the endless track, at least one layer of the second member is a layer of reinforcing cords.

[0031] In some embodiments of the endless track, the carcass further includes a guide lug disposed on an inner surface between the first drive lug and the second drive lug for guiding the wheel, the guide portion extending within the guide lug.

[0032] In some embodiments of the endless track, the inner surface defines a wheel path located laterally between the first drive lug and the guide lug, the wheel path configured to engage a wheel, the wheel path having a first width on the inner surface of the inner portion, the guide lug having a second width on the inner surface of the inner portion, the first drive lug having a third width, and the carcass having a fourth width.

[0033] In some embodiments of the endless track, the first width is between 120 mm and 155 mm.

[0034] In some embodiments of the endless track, the first width is 137.5 mm.

[0035] In some embodiments of the endless track, the first width is 149.2 mm.

[0036] In some embodiments of the endless track, the second width is between 20 mm and 80 mm.

[0037] In some embodiments of the endless track, the second width is 35 mm.

[0038] In some embodiments of the endless track, the second width is less than 40 mm.

[0039] In some embodiments of the endless track, the ratio of the second width to the first width is between 0.22 and 0.35.

[0040] In some embodiments of the endless track, the ratio of the second width to the fourth width is between 0.06 and 0.08.

[0041] In some embodiments of the endless track, the ratio of the first width to the fourth width is between 0.21 and 0.28.

[0042] In some embodiments of the endless track, the ratio of the third width to the fourth width is between 0.21 and 0.19.

[0043] In some embodiments of the endless track, the ratio of the second width to the first width is less than 0.4.

[0044] In some embodiments of the endless track, the ratio of the second width to the fourth width is less than 0.85.

[0045] In some embodiments of the endless track, the endless track further includes a plurality of non-linear outer lugs extending radially outward from an outer surface of the outer portion and spaced longitudinally from one another along the outer surface.

[0046] In some embodiments of the endless track, the plurality of nonlinear lugs includes a first nonlinear outer lug having a nonlinear section extending laterally between the first lateral surface and the second lateral surface.

[0047] In some embodiments of the track, the nonlinear section is a chevron section.

[0048] In some embodiments of the endless track, the first non-linear outer lug further includes at least one linear section disposed proximate to at least one of the first and second lateral surfaces.

[0049] In some embodiments of the endless track, the at least one linear section includes a first linear section and a second linear section, the first linear section being positioned adjacent to one of the first and second lateral faces and the second linear section being positioned adjacent to the other of the first and second lateral faces.

[0050] In some embodiments of the endless track, the plurality of non-linear lugs define a bidirectional pattern.

[0051] In some embodiments of the endless track, the wheel is a sprocket wheel, and the sprocket wheel is configured to engage a plurality of drive lugs to transmit force to the endless track.

[0052] In some embodiments of the endless track, the sprocket wheel includes a rim and a plurality of engagement elements extending laterally away from the rim and spaced circumferentially along the rim, the plurality of engagement elements configured to engage the plurality of drive lugs in an internal drive arrangement.

[0053] In some embodiments of the endless track, the plurality of engagement elements are circumferentially spaced along the rim according to a first pitch and the plurality of drive lugs are longitudinally spaced along the inner surface according to a second pitch, the first pitch being different from the second pitch.

[0054] In some embodiments of the endless track, the second pitch is less than the first pitch.

[0055] In some embodiments of the endless track, the second pitch is greater than the first pitch.

[0056] In some embodiments of the endless track, the track system is operably connected to the engine of the vehicle.

[0057] In some tracked embodiments, the vehicle is a military vehicle.

[0058] In some tracked embodiments, the vehicle is an agricultural vehicle.

[0059] In a second broad aspect of the present technology, there is provided a member for an endless track engageable with a wheel, the endless track comprising a polymer carcass including an outer portion having an outer surface, an inner portion having an inner surface, a plurality of first drive lugs disposed on the inner surface proximate a first lateral edge of the inner portion, and a plurality of second drive lugs disposed on the inner surface proximate a second lateral edge of the inner portion, the member being configured to engage with the wheel and having a guide portion extending from the inner surface of the inner portion of the carcass, the guide portion extending away from the inner and outer surfaces, and a reinforcing portion located within the inner portion of the carcass and extending laterally between one of the plurality of first drive lugs and one of the plurality of second drive lugs, the reinforcing portion being configured to reinforce the inner portion of the carcass and support the weight of the wheel.

[0060] In a third broad aspect of the present technology, a kit for a track system is provided, comprising a wheel and a polymer carcass. The carcass includes an outer portion having an outer surface for contacting the ground and an inner portion having an inner surface opposite the outer surface. A first lateral surface of the carcass extends between the inner surface and the outer surface, and a second lateral surface of the carcass opposite the first lateral surface extends between the inner surface and the outer surface. The carcass is configured to engage with the wheel and includes a plurality of drive lugs disposed on the inner surface proximate the first and second lateral surfaces. The plurality of drive lugs extend radially inward from the inner surface and are longitudinally spaced apart from one another along the inner surface. The plurality of drive lugs includes a first drive lug disposed proximate the first lateral surface and a second drive lug disposed proximate the second lateral surface. The carcass includes a plurality of members disposed within the carcass, the plurality of members extending laterally within the inner portion of the carcass and longitudinally spaced apart from one another along the carcass. A given member from the plurality of members is configured to engage with the wheel and has a guide portion extending radially inward from an inner surface of the inner portion of the carcass and a reinforcing portion located within the inner portion of the carcass and extending laterally between at least a first drive lug and at least a second drive lug. The reinforcing portion is configured to reinforce the inner portion of the carcass and support the weight of the wheel. The plurality of guide lugs are configured to guide the wheel and are located on the inner surface between the first drive lug and the second drive lug. The guide portion extends from the plurality of guide lugs into the given guide lug. The inner surface defines a wheel path located laterally between the first drive lug and the guide lug. The wheel path is configured to engage with the wheel and has a width corresponding to the width of the wheel.

[0061] In a fourth broad aspect of the present technology, a track system for a vehicle is provided. The track system includes a sprocket wheel having a rim and a plurality of engagement elements extending laterally from a longitudinal center plane of the track assembly, the sprocket wheel defining a plurality of grooves between the engagement elements. The track system includes an endless track engageable with the wheel. The endless track includes a polymer carcass. The carcass includes an outer portion having an outer surface for contacting the ground. The carcass includes an inner portion having an inner surface opposite the outer surface. A first lateral surface of the carcass extends between the inner surface and the outer surface, and a second lateral surface of the carcass opposite the first lateral surface extends between the inner surface and the outer surface. The carcass is configured to engage the wheel and includes a plurality of drive lugs disposed on the inner surface proximate the first and second lateral surfaces, the drive lugs extending radially inward from the inner surface and spaced longitudinally apart from one another along the inner surface. The plurality of drive lugs includes a first drive lug disposed proximate the first lateral surface and a second drive lug disposed proximate the second lateral surface. The carcass includes a plurality of members disposed within the carcass, the plurality of members extending laterally within an inner portion of the carcass and spaced longitudinally from one another along the carcass. A given member from the plurality of members is configured to engage the wheel and has a guide portion extending radially inward from an inner surface of the inner portion of the carcass and a reinforcing portion located within the inner portion of the carcass and extending laterally between at least the first drive lug and at least the second drive lug. The reinforcing portion is configured to reinforce the inner portion of the carcass and support the weight of the wheel.

[0062] In a fifth broad aspect of the present technology, a vehicle is provided. The vehicle includes a body, an engine supported by the body, and at least one track system. The at least one track system includes a sprocket wheel having a rim and a plurality of engagement elements extending laterally from a longitudinal center plane of the track assembly, the sprocket wheel defining a plurality of grooves between the plurality of engagement elements. The at least one track system includes an endless track engageable with the wheel. The endless track includes a polymer carcass. The carcass includes an outer portion having an outer surface for contacting the ground. The carcass includes an inner portion having an inner surface opposite the outer surface. A first lateral surface of the carcass extends between the inner surface and the outer surface, and a second lateral surface opposite the first lateral surface of the carcass extends between the inner surface and the outer surface. The carcass includes a plurality of drive lugs configured to engage the wheel and disposed on the inner surface adjacent the first and second lateral surfaces, the plurality of drive lugs extending radially inward from the inner surface and longitudinally spaced apart from one another along the inner surface. The plurality of drive lugs includes a first drive lug disposed proximate the first lateral surface and a second drive lug disposed proximate the second lateral surface. The carcass includes a plurality of members disposed within the carcass, the plurality of members extending laterally within an inner portion of the carcass and spaced longitudinally from one another along the carcass. A given member from the plurality of members is configured to engage the wheel and has a guide portion extending radially inward from an inner surface of the inner portion of the carcass and a reinforcing portion located within the inner portion of the carcass and extending laterally between at least the first drive lug and at least the second drive lug. The reinforcing portion is configured to reinforce the inner portion of the carcass and support the weight of the wheel.

[0063] In the context of this specification, unless otherwise specified, the words "first," "second," "third," etc. are used as adjectives only to enable distinction between the nouns they modify, and not to describe any particular relationship between those nouns.

[0064] 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.

[0065] 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 10%, and more preferably within 5% of the given value or range.

[0066] As used herein, the term "and / or" should be interpreted as a specific disclosure of each of the two specified features or components, regardless of the presence or absence of 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 set forth individually herein.

[0067] For purposes of this application, terms relating to spatial orientation when referring to the track assembly and its associated components, such as "vertical," "horizontal," "forward," "rearward," "left," "right," "upward," and "downward," are as understood by an operator of a vehicle to which the track assembly is connected, the operator sitting in the vehicle in an upright driving position, with the vehicle steered straight ahead and resting on a flat, level ground.

[0068] Implementations of the present technology will have at least one, but not necessarily all, of the above-described objects and / or aspects, and it will be understood that some aspects of the present technology that arise from attempts to achieve the above-described object may not meet that object and / or may meet other objects not specifically recited herein.

[0069] 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.

[0070] For a better understanding of the present technology and other aspects and further features, reference is made to the following description taken in conjunction with the accompanying drawings. [Brief explanation of the drawings]

[0071] [Figure 1] 1 is a perspective view of a military vehicle in accordance with some embodiments of the present technology; [Figure 2] FIG. 1 is a side view of a harvesting vehicle in accordance with some embodiments of the present technology; [Figure 3] 1 is a perspective view of a sprocket wheel in accordance with some embodiments of the present technology; FIG. [Figure 4] 1 is a perspective view of a segment of an endless track in accordance with some embodiments of the present technology; [Figure 5A] FIG. 5 is a top view of the track of FIG. 4. [Figure 5B] 5 is another top view of the endless track of FIG. 4. FIG. [Figure 5C] FIG. 1 is a top view of a simplified representation of a conventional endless track. [Figure 5D] FIG. 5 is a top view of the simplified diagram of the endless track of FIG. [Figure 5E] FIG. 10 is a top view of a simplified diagram of another endless track in accordance with some embodiments of the present technology. [Figure 5F] 12A-12C are top views of simplified diagrams of additional endless tracks in accordance with some embodiments of the present technology; [Figure 6] FIG. 5 is another perspective view of the endless track of FIG. 4. [Figure 7A] FIG. 5 is a bottom view of the track of FIG. 4. [Figure 7B] FIG. 5 is another bottom view of the endless track of FIG. 4. [Figure 8A] FIG. 5 is a side view of the endless track of FIG. [Figure 8B] FIG. 5 is another side view of the endless track of FIG. 4. [Figure 9A] 5B is a cross-sectional view of the track of FIG. 4 through line 9-9 of FIG. 5B. [Figure 9B] 5B is another cross-sectional view of the track of FIG. 4 through line 9-9 of FIG. 5B. [Figure 9C] FIG. 5 is a perspective view of a member of the endless track of FIG. 4. [Figure 10] 1 is a partial perspective view of another tracked military vehicle in accordance with some embodiments of the present technology; FIG. [Figure 11A] FIG. 1 is a perspective view of a cross section of a conventional endless track. [Figure 11B] FIG. 11 is a perspective view of the endless track of FIG. [Figure 12A] FIG. 11B is another perspective view of the conventional endless track of FIG. 11A. [Figure 12B] FIG. 11 is another perspective view of the endless track of FIG. 10. [Figure 13A] FIG. 11 is a cross-sectional view of the track of FIG. [Figure 13B] FIG. 11 is another cross-sectional view of the endless track of FIG. 10. [Figure 13C] 11 is an additional cross-sectional view of the track of FIG. 10. DETAILED DESCRIPTION OF THE INVENTION

[0072] 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. Also, 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.

[0073] The present technology relates to various embodiments of endless tracks, which are described with reference to a track system. The endless track according to some embodiments of the present technology includes a carcass and a given member extending within an inner portion of the carcass. The given member may include a first portion extending inward from an inner surface of the carcass to guide wheels of the track system. The given member may include a second portion extending laterally within the carcass to reinforce the carcass and support the weight of the vehicle. The second portion may be located within the inner portion of the carcass, which may increase the durability of the endless track and / or reduce the width of the endless track. The location of the second portion within the carcass may allow for better optimization of the shape, size, and / or pattern of the outer lugs to increase traction, reduce pressure on the ground, and / or increase the durability of the endless track.

[0074] Vehicle and Track Systems Referring to FIG. 1 , the present technology will be described with reference to a military vehicle 20. Specifically, the military vehicle 20 is an armored vehicle 20, and its forward direction is indicated by arrow 21. The military vehicle 20 has a track system 30 on each side thereof. Each of the track systems 30 has a sprocket wheel assembly 32 attached to the front end of the military vehicle 20, an idler wheel assembly 34 attached to the rear end of the military vehicle 20, and five road wheel assemblies 36 attached along the length of the military vehicle 20. It is contemplated that there may be more or fewer than five road wheel assemblies. Each of the track systems 30 also includes a track 100 surrounding the sprocket wheel assembly 32, the idler wheel assembly 34, and the road wheel assembly 36.

[0075] The sprocket wheel assembly 32 is generally configured to engage the track 100 and transfer motive power from an engine (not shown) of the military vehicle 10 to the track 100. How the sprocket wheel assembly 32 may be implemented in some embodiments of the present technology is described in further detail below with reference to FIG.

[0076] Idler wheel assembly 34 is configured to adjust tension and guide track 100. Road wheel assembly 36 is generally configured to guide the lower running portion of track 100 that engages the ground during use.

[0077] In some embodiments of the present technology, the sprocket wheel assembly 32 may be mounted near the rear end of the military vehicle 20 and the idler wheel assembly 34 may be mounted near the front end of the military vehicle 20. It is contemplated that the location of the one or more sprocket wheel assemblies and the one or more idler wheel assemblies may depend, among other things, on the weight distribution of the military vehicle 20. It is contemplated that the location and number of the one or more road wheel assemblies may depend, among other things, on the weight distribution of the military vehicle 20.

[0078] 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 such as tractors, industrial vehicles such as bulldozers, skid steer loaders, excavators, and compact track loaders, military vehicles such as tanks, utility vehicles, exploration vehicles, and / or all-terrain vehicles such as side-by-side vehicles or utility terrain vehicles. It is contemplated that the present technology may be used with vehicles having a high cargo carrying capacity (e.g., 40 US tons or more). It is contemplated that the present technology may be used with trailers or other non-motorized vehicles.

[0079] Referring to FIG. 2, a harvester 40 is shown. 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 right track system 50 are shown in the accompanying figures). In some embodiments, it is contemplated that the harvester 40 may have more than two track systems. The engine 44 is operably connected to the left and right track systems 50. In some embodiments, it is contemplated that the engine 44 may be operably connected to the rear wheels 46.

[0080] The track system 50 has a sprocket wheel assembly 60 operably connected to an axle (not shown) of the harvester 40 so that as the axle rotates, the sprocket wheel assembly 60 also rotates, thereby driving the track system 50. In some embodiments, the sprocket wheel assembly 60 could be configured to connect to a non-drive axle of the vehicle. How the sprocket wheel assembly 60 is implemented in some embodiments of the present technology is described in further detail below with reference to FIG. 3.

[0081] The track system also includes a frame 70 operatively connected to and disposed laterally inwardly from the sprocket wheel assembly 60. In other embodiments, it is contemplated that the frame 70 may be disposed laterally outwardly 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 front frame member 74, and a rear frame member 76, with the front frame member 74 and the rear frame member 76 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 without any pivotally connected members.

[0082] Track system 50 further includes a front idler wheel assembly 80, a rear idler wheel assembly 82, and three support wheel assemblies 84a, 84b, 84c longitudinally disposed between front idler wheel assembly 80 and rear idler wheel assembly 82. It is contemplated that in some embodiments, track system 50 may have more or less than three support wheel assemblies.

[0083] Front idler wheel assembly 80 and support wheel assembly 84a are rotatably connected to front frame member 74. Support wheel assemblies 84b, 84c are connected to form a tandem 86, which is further pivotally connected to rear frame member 76. Rear idler wheel assembly 82 is also rotatably connected to rear frame member 76. Thus, track system 50 is able to adapt to some extent to obstacles that are encountered.

[0084] Each 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 a left and right wheel (only the right wheel of each wheel assembly 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 with a single wheel or three or more wheels laterally.

[0085] In some embodiments, it is contemplated that the track system 50 may include a tensioner configured to adjust the tension of the endless track 101 .

[0086] Sprocket Wheel Assembly 3, there is shown a sprocket wheel 300 of the sprocket wheel assembly 32. It should be noted that the sprocket wheels of the sprocket wheel assembly 60 may be implemented in a similar manner without departing from the scope of the present technology.

[0087] Sprocket wheel 300 is operably connectable to an engine (not shown) and rotatable about sprocket wheel axis 301. Sprocket wheel 300 defines a central opening 310 that is generally aligned with sprocket wheel axis 301. In some embodiments, central opening 310 is configured to partially receive an axle (not shown) of vehicle 20 and / or harvester 40.

[0088] The sprocket wheel 300 has a rim 320 and a plurality of engagement elements 330 a, 330 b extending laterally away from the rim 320 .

[0089] The rim 320 includes intermediate annular rim portions 340a, 340b disposed on either lateral side of a central annular channel 345. It is contemplated that the intermediate annular portions 340a and 340b may be fastened to one another via one or more fasteners. For example, the intermediate annular portions 340a and 340b may be fastened to one another using one or more bolts.

[0090] The central annular channel 345 is configured to receive a portion of a given track therein. It is contemplated that the rim 320 may further include a central annular rim portion that defines the central annular channel. In other embodiments, the central annular rim portion may define a plurality of openings instead of a central annular channel for receiving a portion of a given track.

[0091] The intermediate annular rim portions 340a, 340b are configured to support a portion of a given track. The intermediate annular rim portions 340a, 340b have substantially smooth radial surfaces without edges. However, in other embodiments, a given side annular rim portion may have polygonal lateral faces that define multiple edges.

[0092] A plurality of engaging elements 330a extend laterally outward from an edge of intermediate annular rim portion 340a, and a plurality of engaging elements 330b extend laterally outward from an edge of intermediate annular rim portion 340b. Engaging elements 330a, 330b are circumferentially spaced about intermediate annular rim portions 350a, 350b. Engaging elements 330a, 330b, which may also be referred to as "teeth," are configured to engage with a given track.

[0093] A plurality of recesses 360a are defined between the plurality of engaging elements 330a, and a plurality of recesses 360b are defined between the plurality of engaging elements 330b. More precisely, one recess 360a is defined between two adjacent engaging elements 330a, and one recess 360b is defined between two adjacent engaging elements 330b. As described below, recesses 360a, 360b are configured to receive a portion of a given track therein.

[0094] In some implementations of the present technology, the pitch of the sprocket wheel 300 may be 120 mm. In other embodiments, the pitch of the sprocket wheel 300 may be in a range between 50 mm and 200 mm. In some implementations of the present technology, the radius of the sprocket wheel 300 may be 240 mm. In other embodiments, the radius of the sprocket wheel 300 may be in a range between 125 mm and 550 mm.

[0095] It is contemplated that sprocket wheel assemblies contemplated in some embodiments of the present technology may have an "internal drive" configuration. Generally, sprocket wheel assemblies of an internal drive configuration generally include laterally extending engagement elements configured to interact with inwardly extending drive lugs of the track. In contrast to an "external drive" configuration in which outwardly extending engagement elements of the sprocket wheel interact with laterally extending drive lugs of the track, an internal drive configuration may allow for a reduction in track width. It is contemplated that narrower tracks may be beneficial in at least some implementations of the present technology.

[0096] The sprocket wheel assembly 300 is made of steel. In some embodiments, it is contemplated that the sprocket wheel assembly 300 may be made of other materials, such as ultra-high molecular weight polyethylene (UHMW). In other embodiments, the sprocket wheel assembly 300 may be made of steel coated with UHMW (which may help reduce the noise generated by engaging a given track).

[0097] In at least some implementations of the present technology, the sprocket wheel 300 may be embodied similarly to the sprocket wheel disclosed in U.S. Patent No. 7,416,266, entitled "Sprocket wheel for heavy high speed multi-terrain vehicles," issued August 26, 2008, the contents of which are incorporated herein by reference in their entirety.

[0098] endless track 4 and 5, a segment of the endless track 100 is shown. The endless track 100 comprises a body or carcass 400. The carcass 400 has an inner surface 402 engageable with the sprocket wheel assembly 300, the idler wheel assembly 34, and the road wheel assembly 36 (or, in the case of the endless track 101, the front and rear idler wheel assemblies 80, 82 and the support wheel assemblies 84a, 84b, 84c). Opposite the inner surface 402, the carcass 400 has an outer surface 404 engageable with the ground. The carcass 400 also has a first lateral surface 406 and a second lateral surface 408 extending between the inner surface 402 and the outer surface 404.

[0099] It should be noted that the carcass 400 can be said to have at least two portions: an inner portion 401 having an inner surface 402 configured to engage with components of the track system 30, and an outer portion 403 having an outer surface 404 configured to engage with the ground.

[0100] In some embodiments, the carcass 400 is made of a polymeric material. The polymeric material could be an elastomeric material, such as rubber. As such, the carcass 400 is flexible, allowing it to conform to obstacles and / or components of the track system 30, such as the sprocket wheel assembly 300. The elastic nature of the track 100 allows it to deform when overcoming obstacles and / or conforming to one of the wheel assemblies.

[0101] Focusing initially on the inner surface 402 of the inner portion 401, the track 100 includes a first plurality of drive (inner) lugs 410a adjacent the first lateral surface 406 and a second plurality of drive (inner) lugs 410b adjacent the second lateral surface 408. The drive lugs from the first plurality of drive lugs 410a and the second plurality of drive lugs 410b extend inward (e.g., as opposed to laterally) from the inner surface 402 and are spaced apart longitudinally along a longitudinal center plane of the track 100.

[0102] As previously described, the first and second plurality of drive lugs 410a, 410b are configured to engage with the sprocket wheel assembly 300. Note that the inner surface 402 defines a first plurality of recesses 430a between the first plurality of drive lugs 410a and a second plurality of recesses 430b between the second plurality of drive lugs 410b. During operation, the first plurality of drive lugs 410a are received within the plurality of recesses 360a, the second plurality of drive lugs 410b are received within the plurality of recesses 360b, the plurality of engaging elements 330a are received within the first plurality of recesses 430a, and the plurality of engaging elements 330b are received within the second plurality of recesses 430b. As previously described, the first and second plurality of drive lugs 410a, 410b are arranged in an internal drive configuration.

[0103] The track 100 also includes a wheel path 440a and a wheel path 440b configured to support wheels of one or more wheel assemblies of the track system 30, including the sprocket wheel assembly 300 and rim portions of other wheel assemblies of the track system 30.

[0104] In at least some embodiments of the present technology, developers have devised an endless track having a wheel path optimized for a given performance metric of a corresponding track system. As will become apparent from the following description, the inner portion of the carcass 400 may be provided with a given feature that allows (i) an increase in the width of at least one wheel path on the inner surface 402 and (ii) a reduction in the width of the carcass 400 itself. Increasing the width of at least one wheel path may reduce the pressure applied to the carcass 400. Reducing the width of the carcass 400 may facilitate installation of the carcass 400 on the track system 30 and / or reduce the cost of the track system 30.

[0105] The track 100 also includes a plurality of guide lugs 420 along a longitudinal center plane of the track 100. The plurality of guide lugs 420 are configured to engage with the sprocket wheel assembly 300 and other wheel assemblies of the track system 30 to guide the track 100 relative to the wheel assemblies during operation. The guide lugs from the plurality of guide lugs 420 extend inwardly from the inner surface 402 (e.g., as opposed to laterally) and are spaced longitudinally along the longitudinal center plane of the track 100.

[0106] In at least some embodiments of the present technology, developers of the present technology have devised a carcass having a given member that can extend at least partially into a corresponding guide lug. As will become apparent from the description below, the given member can reinforce the corresponding guide lug and / or guide one or more wheels along the track 100. Reinforcing the corresponding guide lug can, in at least some implementations of the present technology, allow the width of the corresponding guide lug to be reduced.

[0107] 5A , the inner surface 402 can be said to have a plurality of zones including a first drive zone 502, a first wheel path zone 504, a guide zone 506, a second wheel path zone 508, and a second drive zone 510. The first plurality of drive lugs 410 a and the first plurality of recesses 430 a are located within the first drive zone 502 of the inner surface 402. The second plurality of drive lugs 410 b and the second plurality of recesses 430 b are located within the second drive zone 510 of the inner surface 402. The plurality of guide lugs 420 are located within the guide zone 506. The first wheel path 440 a is located within the first wheel path zone 504. The second wheel path 440 b is located within the second wheel path zone 508. It is contemplated that the width of each zone from the plurality of zones may be optimized for one or more performance metrics of the track system 30 and / or corresponding vehicle.

[0108] Referring to FIG. 5B, lines 551-556 are depicted. Lines 551-556 are parallel to one another. Line 551 traces the edge of the inner surface 402 and passes through the lateral outermost points of the first plurality of drive lugs 410a. Line 552 passes through the lateral center of the first plurality of drive lugs 410a. Line 553 passes through the lateral innermost points of the first plurality of drive lugs 410a and traces the outer edge of the first wheel path 440a. Line 554 passes through the first lateral outermost points of the plurality of guide lugs 420 and traces the inner edge of the first wheel path 440a. Line 555 traces the longitudinal center plane of the track 100 and passes through the lateral center of the plurality of guide lugs 420. A line 556 passes through second opposing laterally outermost points of the plurality of guide lugs 420 and follows the inner edge of the second wheel path 440b.

[0109] Line 551 is located a lateral distance 571 from line 553. Lateral distance 571 represents the overall width of the first plurality of drive lugs 410a. Lateral distance 571 also represents the overall width of first drive zone 502. In this embodiment, lateral distance 571 is approximately 110 mm.

[0110] Line 553 is located a lateral distance 572 from line 554. Lateral distance 572 represents the overall width of first wheel path 440a and / or first wheel path zone 504. In this embodiment, lateral distance 572 is 137.5 mm.

[0111] Line 554 is located a lateral distance 573 from longitudinal line 556. Lateral distance 573 represents the overall width of the plurality of guide lugs 420. Lateral distance 573 also represents the overall width of guide zone 506. In this embodiment, lateral distance 573 is approximately 35 mm.

[0112] Line 551 is located at lateral distance 561 from line 555. Lateral distance 561 represents half the overall width of track 100. In this embodiment, lateral distance 561 is 265 mm (530 mm / 2 = 265 mm). Line 552 is located at lateral distance 562 from line 555. Lateral distance 562 represents the lateral distance between the lateral center of the plurality of guide lugs 420 and the lateral center of the first plurality of drive lugs 410 a. In this embodiment, lateral distance 562 is 210 mm (distance 561 - (distance 571 / 2) = 265 mm - (110 mm / 2) = 210 mm). Line 553 is located at lateral distance 563 from line 555. In this embodiment, lateral distance 563 is 155 mm (distance 561 - distance 571 = 265 mm - 110 mm = 155 mm). Line 554 is located a lateral distance 564 from line 555. Lateral distance 564 represents half the overall width of guide lugs 420. In this embodiment, lateral distance 564 is 17.5 mm (distance 573 / 2 = 35 mm / 2 = 17.5 mm).

[0113] In some implementations of the present technology, the ratio of lateral distance 573 to lateral distance 572 is 0.255. In some implementations of the present technology, the ratio of lateral distance 573 to the width of the carcass 400 is 0.066. In some implementations of the present technology, the ratio of lateral distance 572 to the width of the carcass 400 is 0.259. In some implementations of the present technology, the ratio of lateral distance 571 to the width of the carcass 400 is 0.208. In some implementations of the present technology, the ratio of lateral distance 573 to twice the lateral distance 563 is 0.113.

[0114] Referring to FIG. 5C, a simplified diagram 591 of a conventional endless track is shown. Lateral distance 561' represents half the overall width of the conventional endless track. Lateral distance 561' is 294 mm. Lateral distance 562' represents the lateral distance between the lateral centers of the guide lugs and the lateral centers of the drive lugs. Lateral distance 562' is 232 mm. Lateral distance 563' represents the lateral distance between the lateral centers of the drive lugs and the outer edge of the wheel path. Lateral distance 563' is 170 mm. Lateral distance 564' represents half the overall width of the guide lugs. Lateral distance 564' is 32.5 mm.

[0115] Lateral distance 571' represents the overall width of the drive lugs of a conventional track. Lateral distance 571' is 124 mm. Lateral distance 572' represents the overall width of the wheel path. Lateral distance 572' is 137.5 mm. Lateral distance 573' represents the overall width of the guide lugs. Lateral distance 573' is 65 mm.

[0116] The ratio of lateral distance 573' to lateral distance 572' is 0.473. The ratio of lateral distance 573' to the width of the conventional track is 0.111. The ratio of lateral distance 572' to the width of the conventional track is 0.234. The ratio of lateral distance 571' to the width of the conventional track is 0.211. The ratio of lateral distance 573' to twice lateral distance 563' is 0.191.

[0117] Referring to Figure 5D, there is shown a simplified diagram 592 of the carcass 400 of Figure 5B. The simplified diagram 592 is drawn to the same scale as the simplified diagram 591 of the conventional track seen in Figure 5C.

[0118] In some embodiments, the lateral distance 572 may be between 120 mm and 155 mm. In other embodiments, the lateral distance 572 may be greater than 135 mm. In further embodiments, the lateral distance 572 may be less than 150 mm.

[0119] In some embodiments, the lateral distance 573 may be 35 mm. In other embodiments, the lateral distance 573 may be between 20 mm and 80 mm. In further embodiments, the lateral distance 573 may be less than 90 mm. In additional embodiments, the lateral distance 573 may be less than 60 mm. In still other embodiments, the lateral distance 573 may be less than 40 mm.

[0120] In some embodiments, the ratio of lateral distance 573 to lateral distance 572 may be between 0.220 and 0.350. In other embodiments, the ratio of lateral distance 573 to lateral distance 572 may be less than 0.400. In further embodiments, the ratio of lateral distance 573 to lateral distance 572 may be greater than 0.200.

[0121] In some embodiments, the ratio of the lateral distance 573 to the width of the carcass 400 may be between 0.060 and 0.080. In other embodiments, the ratio of the lateral distance 573 to the width of the carcass 400 may be less than 0.085. In further embodiments, the ratio of the lateral distance 573 to the width of the carcass 400 may be greater than 0.055.

[0122] In some embodiments, the ratio of the lateral distance 572 to the width of the carcass 400 may be between 0.210 and 0.280. In other embodiments, the ratio of the lateral distance 572 to the width of the carcass 400 may be greater than 0.205. In further embodiments, the ratio of the lateral distance 572 to the width of the carcass 400 may be less than 0.290.

[0123] In some embodiments, the ratio of the lateral distance 571 to the width of the carcass 400 may be between 0.220 and 0.190. In other embodiments, the ratio of the lateral distance 571 to the width of the carcass 400 may be less than 0.210. In other embodiments, the ratio of the lateral distance 571 to the width of the carcass 400 may be greater than 0.190.

[0124] In some embodiments, the ratio of lateral distance 573 to twice lateral distance 563 may be between 0.120 and 0.090. In other embodiments, the ratio of lateral distance 573 to twice lateral distance 563 may be less than 0.180. In further embodiments, the ratio of lateral distance 573 to twice lateral distance 563 may be greater than 0.080.

[0125] Referring to FIG. 5E, a simplified diagram 593 of a carcass envisioned in another embodiment of the present technology is shown. Lateral distance 561″ represents half of the overall width of the carcass in another embodiment. Lateral distance 561″ is 261 mm. Lateral distance 562″ represents the lateral distance between the lateral centers of the guide lugs and the lateral centers of the carcass's drive lugs in another embodiment. Lateral distance 562″ is 208 mm. Lateral distance 563″ represents the lateral distance between the lateral centers of the drive lugs and the outer edge of the carcass's wheel path in another embodiment. Lateral distance 563″ is 155 mm. Lateral distance 564″ represents half of the overall width of the carcass's guide lugs in another embodiment. Lateral distance 564″ is 17.5 mm.

[0126] Lateral distance 571" represents the overall width of the drive lugs of the carcass in another embodiment. Lateral distance 571" is 106 mm. Lateral distance 572" represents the overall width of the wheel path of the carcass in another embodiment. Lateral distance 572" is 137.5 mm. Lateral distance 573" represents the overall width of the guide lugs of the carcass in another embodiment. Lateral distance 573" is 35 mm.

[0127] The ratio of lateral distance 573" to lateral distance 572" is 0.255. In another embodiment, the ratio of lateral distance 573" to carcass width is 0.067. In another embodiment, the ratio of lateral distance 572" to carcass width is 0.263. In another embodiment, the ratio of lateral distance 571" to carcass width is 0.203. The ratio of lateral distance 573" to twice lateral distance 563" is 0.113.

[0128] Referring to FIG. 5F , a simplified diagram 594 of a carcass contemplated in an additional embodiment of the present technology is shown. Lateral distance 561′′ represents half of the overall width of the carcass in an additional embodiment. Lateral distance 561′′ is 272.7 mm. Lateral distance 562′′ represents the lateral distance between the lateral centers of the guide lugs and the lateral centers of the carcass's drive lugs in an additional embodiment. Lateral distance 562′′ is 219.7 mm. Lateral distance 563′′ represents the lateral distance between the lateral centers of the drive lugs and the outer edge of the carcass's wheel path in an additional embodiment. Lateral distance 563′′ is 166.7 mm. Lateral distance 564′′ represents half of the overall width of the carcass's guide lugs in an additional embodiment. Lateral distance 564′′ is 17.5 mm.

[0129] Lateral distance 571"' represents the overall width of the drive lugs of the carcass in an additional embodiment. Lateral distance 571"' is 106 mm. Lateral distance 572"' represents the overall width of the wheel path of the carcass in an additional embodiment. Lateral distance 572"' is 149.2 mm. Lateral distance 573"' represents the overall width of the guide lugs of the carcass in an additional embodiment. Lateral distance 573"' is 35 mm.

[0130] The ratio of lateral distance 573"' to lateral distance 572"' is 0.235. In an additional embodiment, the ratio of lateral distance 573"' to carcass width is 0.064. In an additional embodiment, the ratio of lateral distance 572"' to carcass width is 0.274. In an additional embodiment, the ratio of lateral distance 571"' to carcass width is 0.194. The ratio of lateral distance 563"' to twice lateral distance 573"' is 0.105.

[0131] 6 and 7A, the focus is now shifted to the outer surface 404 of the carcass 400 seen in Fig. 5B. However, it should be noted that the outer surfaces and sidewalls of other carcass embodiments shown in Figs. 5E and 5F can be implemented in a similar manner to the outer surface 404 and sidewalls of the carcass 400 without departing from the scope of the present technology.

[0132] The track 100 includes a plurality of outer lugs 610 that are capable of engaging the ground. As described in more detail below, the shape of the outer lugs 610 can vary from embodiment to embodiment without departing from the scope of the present technology. In some embodiments, the shape of the outer lugs 610 can vary to conform to the ground engaged by the track 100. The outer lugs 610 extend away from the outer surface 404 and are spaced longitudinally along the longitudinal center plane of the track 100.

[0133] Each of the outer lugs 610 extends laterally along the entire width of the track 100. It is contemplated that in some embodiments, the outer lugs 610 may extend along only a portion of the width of the track 100. In some embodiments, the outer lugs 610 may have varying widths (e.g., one outer lug is wider than another). The spacing and width of the outer lugs 106 may vary depending on the type of ground on which the track 100 is to be used.

[0134] The plurality of outer lugs 610 includes a first outer lug 710 and a second outer lug 720 adjacent to the first outer lug 710. The first outer lug 710 includes zones 711 to 713. The second outer lug 720 includes zones 721 to 723. Zones 711, 712, 721, and 722 are generally straight across the width of the track 100. Zones 712 and 722 have a generally angled shape. The plurality of outer lugs 610 can be said to be nonlinear across the width of the track 100.

[0135] The first outer lug 710 has a front wall 740 and a rear wall 750. The second outer lug 720 has a front wall 760 and a rear wall 770. The rear wall 750 includes wall portions 751-753. The front wall 760 includes wall portions 761-763. The rear wall 750 of the first outer lug 710 and the front wall 760 of the second outer lug 720 define a channel 730. The channel 730 includes a channel portion 731 defined between wall portions 751 and 761, a channel portion 732 defined between wall portions 752 and 762, and a channel portion 733 defined between wall portions 753 and 763. Channel portions 731 and 733 are generally straight across the width of the track 100. Channel portion 732 has a generally angle-like shape. The plurality of channels 620 can be said to be non-linear across the width of the track 100. A forward-most point 792 along the front wall 760 of the second outer lug 720 can be said to be longitudinally forward from a rear-most point 791 along the rear wall 750 of the first outer lug 710.

[0136] It is contemplated that the shape, size, and / or pattern of the outer lugs may reduce lateral slippage of the track 100. It is contemplated that the pattern of the outer lugs may vary depending on, among other things, various implementations of the present technology. For example, the pattern of the outer lugs may be designed to provide traction when the track 100 is driven in a first direction and a second, opposite direction. The developers have recognized that providing a "bidirectional" pattern on the track may at least partially assist in moving and / or turning a corresponding vehicle forward and / or backward. In another example, the pattern of the outer lugs may be designed to prevent discovery of the direction of travel of a corresponding vehicle based on a visual analysis of the track's footprint on the ground. The developers have recognized that providing a "bidirectional" pattern on the track may help conceal the direction of travel of a corresponding vehicle, which may be beneficial in at least some applications of the present technology. Briefly referring to FIGS. 12B and 13B, an endless track 1100 is shown with outer lugs arranged in a bidirectional pattern, as contemplated in at least some embodiments of the present technology.

[0137] Referring to FIG. 7B, lines 771-773 and lines 774-776 are shown. Lines 771-773 are parallel to one another. Lines 774-776 are parallel to one another. Lines 771-773 are perpendicular to lines 774-776. Line 771 traces the edge of the inner surface 402 and passes through the lateral outermost point of the outer lug 610. Line 772 passes between zones 711 and 712. Line 773 extends along the longitudinal center plane of the track 100. Line 774 passes through the forward-most point of a first channel, line 775 passes through the aft-most point of the first channel, and line 776 passes through the forward-most point of the next channel.

[0138] In this embodiment, the lateral distance 781 between line 771 and line 773 is 265 mm. In this embodiment, the lateral distance 782 between line 772 and line 773 is 179.3 mm. In this embodiment, the longitudinal distance 783 between line 774 and line 775 is 89.72 mm. In this embodiment, the longitudinal distance 784 between line 775 and line 776 is 30.28 mm. The width 785 of the first channel is 29.72 mm.

[0139] Referring to FIG. 8A, lines 801-806 are depicted. Lines 801-806 are parallel to one another. Line 801 passes through the apexes of the guide lugs 420. Line 802 passes through the apexes of the drive lugs 410b. Line 803 is aligned with the inner surface 402 and the wheel paths 440a and 440b. Line 804 passes through the bottom points of the recesses 430b. Line 805 passes through the deepest points of the channels 620. Line 806 passes through the bottom points of the outer lugs 610.

[0140] In this embodiment, vertical distance 811 between line 801 and line 806 corresponds to the overall height of track 100 and is 185.15 mm. In this embodiment, vertical distance 812 between line 802 and line 806 is 114.25 mm. In this embodiment, vertical distance 813 between line 803 and line 806 is 75.15 mm. In this embodiment, vertical distance 814 between line 804 and line 806 is 62.75 mm. In this embodiment, vertical distance 815 between line 805 and line 806 corresponds to the height of outer lug 610 and is 37 mm.

[0141] In this embodiment, vertical distance 821 between line 801 and line 803 corresponds to the height of guide lugs 420 and is 110 mm. In this embodiment, vertical distance 822 between line 802 and line 804 corresponds to the height of the drive lugs and is 51.5 mm. In this embodiment, vertical distance 823 between line 803 and line 804 is 12.4 mm. In this embodiment, vertical distance 824 between line 804 and line 805 is 25.75 mm.

[0142] Referring to FIG. 8B, lines 831-840 and lines 851-854 are shown. Lines 831-840 and lines 851-854 are parallel to one another. Line 831 passes through the forward-most point of a given guide lug. Line 832 passes through the aft-most point of a given guide lug. Line 833 passes through the forward-most point of a given drive lug. Line 834 passes through the aft-most point of a given drive lug. Line 835 passes through the bottom point of a given channel. Line 836 passes through the bottom point of the next channel. Lines 837 and 838 pass through the closest points of a pair of consecutive drive lugs. Lines 839 and 840 pass through the closest points of a pair of consecutive guide lugs. Lines 851 and 852 pass through the apexes of a pair of consecutive drive lugs. Lines 851 and 852 also pass through the apexes of a pair of consecutive guide lugs. Lines 853 and 854 pass through the bottom points of a pair of consecutive recesses.

[0143] In this embodiment, horizontal distance 861 between lines 831 and 832 corresponds to the length of a given guide lug and is 97.5 mm. In this embodiment, horizontal distance 862 between lines 833 and 834 corresponds to the length of a given drive lug and is 75 mm. In this embodiment, horizontal distance 863 between lines 835 and 836 corresponds to the length of a given outer lug and is 120 mm. In this embodiment, horizontal distance 864 between lines 837 and 838 corresponds to the spacing between two consecutive drive lugs and is 45 mm. In this embodiment, horizontal distance 865 between lines 839 and 840 corresponds to the spacing between two consecutive guide lugs and is 22.5 mm. In this embodiment, horizontal distance 871 between lines 851 and 852 corresponds to the peak-to-peak distance and is 120 mm. In this embodiment, the horizontal distance 872 between lines 853 and 854 corresponds to the guide lug pitch and the drive lug pitch and is 120 mm.

[0144] In this embodiment, the ratio of guide lug pitch to drive lug pitch is equal to 1. In other embodiments, the ratio of guide lug pitch to drive lug pitch may be greater than or less than 1. In this embodiment, the ratio of guide lug pitch to outer lug pitch is equal to 1. In other embodiments, the ratio of guide lug pitch to outer lug pitch may be greater than or less than 1. In this embodiment, the ratio of drive lug pitch to outer lug pitch is equal to 1. In other embodiments, the ratio of drive lug pitch to outer lug pitch may be greater than or less than 1.

[0145] In this embodiment, the guide lug pitch and / or drive lug pitch (see distance 872) is equal to the outer lug pitch (see distance 863), but there is a longitudinal offset between a given outer lug and the corresponding drive lug and corresponding guide lug. This longitudinal offset may create a "hinge effect" that provides flexibility to the carcass. However, it should be noted that in other embodiments of the present technology, a given outer lug may be aligned with the corresponding drive lug and / or corresponding guide lug.

[0146] The developers have recognized that conventional endless tracks often include an additional laterally extending reinforcing member in the outer portion of the carcass that limits the position of the outer lug relative to the corresponding drive lug and / or corresponding guide lug. In other words, in prior art solutions that include an additional laterally extending reinforcing member in the outer portion of the carcass, the outer lug is often aligned with the guide lug and / or drive lug. As will become more apparent from the description below, the use of member 910 can, for example, eliminate the need for an additional laterally extending reinforcing member in the outer portion of the carcass, which can enable the design of a carcass with a longitudinal offset between a given outer lug and the corresponding drive lug and / or corresponding guide lug, and can further provide the "hinge effect" described above.

[0147] Referring to Figure 9A, a cross-sectional view of the carcass 400 is shown through line 9-9 in Figure 5B. A member 910 is visible disposed within the carcass 400. The member 910 extends laterally within the inner portion 401 of the carcass 400. The carcass 400 may comprise a plurality of members embodied similarly to the member 910, which may be considered to be longitudinally spaced apart from one another along the carcass 400.

[0148] 9A-9C , the member 910 includes a guide portion 912 configured to engage a given wheel of the track system 30 and extends radially inward from the inner surface 402 of the inner portion 401 of the carcass 400. The guide portion 912 extends into the guide lug 901, thereby reinforcing the guide lug 901. The guide portion 912 tapers vertically when viewed from the front. More specifically, the width W of the guide portion 912 varies along its height H, with the width W of the guide portion 912 at its base being greater than the width W of the guide portion 912 at its peak. In some embodiments, the width W of the guide portion 912 may be uniform along its height H. In other embodiments, the guide portion 912 may taper vertically when viewed from the side. For example, the length L of the guide portion 912 may vary along its height H, with the length L of the guide portion 912 at its base being greater than the length L of the guide portion 912 at its peak. It can also be said that the height H of guide portion 912 varies along its length L, with height H being greatest at the middle of the length L of guide portion 912. As best seen in Figure 9C, guide portion 912 has a curved end 913 at its apex.

[0149] The member 910 is located within the inner portion 401 of the carcass 400 and includes a reinforcing portion 914 extending laterally between at least the first drive lug 902 and the at least the second drive lug 903. The reinforcing portion 914 is located below the wheel paths 440a, 440b and can be said to be configured to support a predetermined vehicle weight. The reinforcing portion 914 is configured to reinforce the inner portion 401 of the carcass 400. The reinforcing portion 914 extends laterally from the guide portion 912. A fillet 915 is defined between the guide portion 912 and the reinforcing portion 914. The fillet 915 can help reduce stress concentrations within the member 910. In the reinforcing portion 914 shown in FIG. 9C , the reinforcing portion 914 is generally flat and has a generally uniform height (sometimes referred to as “thickness”). In some embodiments, the ratio of the width of the base of the guide portion 912 to the thickness of the reinforcing portion 914 can be approximately 4 to 1. In other embodiments, the ratio of the width of the curved end 913 of the guide portion 912 to the thickness of the reinforcing portion 914 can be about 1 to 1. In other embodiments, particularly the reinforcing portion 914 shown in FIGS. 9A and 9B , the height of the reinforcing portion 914 varies along its width, with the height of the reinforcing portion 914 being greater closer to the guide portion 912 than away from it. The reinforcing portion 914 has curved ends 916 at each lateral end thereof. The curved ends 916 can help reduce stress concentrations in the member 910 and / or the carcass 102. In some embodiments, the ratio of the width Wr of the reinforcing portion 914 (the width Wr measured between one of the curved ends 916 and the corresponding fillet 915) to the height H of the guide portion 912 is about 1.5 to 1.

[0150] While member 910 is a T-shaped member, this may not be the case in all embodiments of the present technology. Guide portion 912 and reinforcing portion 914 are integrally formed. It is contemplated that member 910 may be made from a rigid material. For example, a rigid member, as opposed to a resilient member, may be used to prevent and / or reduce deformation and / or bending of the member so that it retains its shape when a force is applied during operation. It is contemplated that the rigidity of an integrally formed member may be provided at least in part by its geometric configuration. For example, member 910 having a T-shape and / or a solid body (i.e., not hollow) may be stiffer than a member formed from bent sheet metal and / or having a hollow body. It is also contemplated that the rigidity of an integrally formed member may be provided at least in part by the material used to manufacture the member. For example, member 910 manufactured using cast iron, titanium, steel, etc. may increase its rigidity.

[0151] In at least some embodiments of the present technology, the guide portion 912 may be exposed, that is, not necessarily covered by the layer of elastomeric material used to form the carcass 400. In these embodiments, at least some of the functions of the guide lugs may be performed by the exposed guide portion.

[0152] A plurality of reinforcing cables 920 are embedded within the inner portion 401 of the carcass 102. Other configurations are contemplated. The reinforcing cables 920 are configured to generally distribute loads along the carcass 400 and / or limit longitudinal stretch of the carcass 400. In other words, the reinforcing cables 920 may reinforce the carcass 400 longitudinally, and the reinforcing portions 914 may reinforce the carcass 400 laterally, which may help reduce the likelihood of the track 100 being torn and / or damaged, thereby extending the lifespan of the track 100.

[0153] 9A, the plurality of reinforcing cables 920 are disposed within the layer of reinforcing cords. Also, note that the reinforcing portion 914 is disposed between the inner surface 401 and the plurality of reinforcing cords 920.

[0154] In some embodiments, it is believed that the reinforcing portion 914 is located within the inner portion 401 of the carcass 400 and may, in a sense, "seat" on one or more layers of reinforcing cords 920. The reinforcing portion 914 may or may not be in direct contact with the reinforcing cords 920. The developers have recognized that providing the reinforcing portion 914 in the inner portion 401 of the carcass 400 between the wheel paths 440a and 440b and one or more layers of reinforcing cords 920 may help avoid the need for reinforcing elements in the outer portion 403 of the carcass 400. Avoiding additional reinforcing elements in the outer portion 403 of the carcass 400 may be beneficial because it reduces dimensional constraints on the shape, size, and / or pattern of the outer lugs.

[0155] The developers also recognized that providing reinforcing portions 914 within the inner portion 401 of the carcass 400 between the wheel paths 440 a and 440 b and one or more layers of reinforcing cords 920 may reduce wear on the carcass 400 and / or one or more layers of reinforcing cords 920. Providing reinforcing portions 914 extending within the inner portion 401, as opposed to providing reinforcing portions 914 within the outer portion 403, may provide a reinforcing barrier between a given wheel of the track system 30 and the layers of reinforcing cords 920, for example, to help support and distribute the weight of a given vehicle. It is believed that providing such a reinforcing barrier between the wheel assembly and the reinforcing cords 920 may reduce the risk of the reinforcing cords 920 migrating and / or becoming exposed within the carcass 400.

[0156] Referring to FIG. 9B, lines 1051-1056 are drawn. Lines 1051-1056 are parallel to one another. A lateral distance 1062 between lines 1051 and 1056 corresponds to the width of the layer of reinforcement cords 920 in the carcass 400. The lateral distance 1062 is 495.3 mm. A lateral distance 1063 between lines 1052 and 1055 corresponds to the width of the reinforcement portion 914. The lateral distance 1063 is 350.3 mm. A lateral distance 1061 between lines 1053 and 1054 corresponds to the width of the guide portion 912. The lateral distance 1061 is between 80 mm and 19 mm.

[0157] While each of the above-described features may by itself increase the durability of the track 100 (i.e., extend the life of the track 100), the combination of the above-described features is synergistic. In other words, the combination has a greater impact on the life of the track 100 than the sum of its parts.

[0158] In another embodiment of the present technology, and referring to FIG. 10 , an endless track 1100 is provided that is configured to cooperate with a sprocket wheel 1002 and a road wheel 1003 of a military vehicle 1000. It is contemplated that the endless track 1100 may include one or more members embodied similarly to member 910 of the endless track 100. It may be desirable to provide the endless track 1100 with an increased width of the corresponding road wheel path for a given width of the carcass. For example, it may be desirable to increase the width of the road wheel path while maintaining an overall width of the corresponding carcass at 530 mm. In this example, providing members within the endless track 110 can serve to reduce the width of the corresponding guide lug, thereby providing additional space for increasing the width of the corresponding road wheel path.

[0159] In Figure 11A, a section of a conventional endless track 1199 is provided. In Figure 11B, a section of an endless track 1100 is provided. As can be seen, the endless track 1100 can have a relatively large drive lug pitch, a relatively large guide lug pitch, a relatively wide road wheel path, and relatively narrow guide lugs.

[0160] Figure 12A provides another view of a section of a conventional endless track 1199. Figure 12B provides another view of a section of endless track 1100. As can be seen, the endless track 1100 can provide relatively deep outer lugs, relatively long outer lugs, and / or can have more complex outer lug patterns (e.g., bidirectional and non-linear).

[0161] 13A-13C show cross-sectional views of a section of the track 1100. As can be seen, the track 1100 includes a member 1310 having a guide portion 1312 and a reinforcing portion 1314. In this embodiment, the reinforcing portion 1314 extends laterally within the carcass of the track 1100 and along substantially the entire width of the carcass.

[0162] 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, not limiting. Accordingly, it is intended that the scope of the invention be limited only by the appended claims. [Explanation of symbols]

[0163] 20 Military vehicle, armored car, 30 Track system, 32 Sprocket wheel assembly, 34 Idler wheel assembly, 36 Road wheel assembly, 40 Harvester, 42 Frame, 44 Engine, 46 Right rear wheel, 50 Right track system, 60 Sprocket wheel assembly, 70 Frame, 72 Main frame, 74 Front frame member, 76 Rear frame member, 80 Front idler wheel assembly, 82 Rear idler wheel assembly, 84a Support wheel assembly, 84b Support wheel assembly, 84c Support wheel assembly, 86 Tandem, 100 Endless track, 101 Endless track, 102 Carcass, 106 Outer lug, 110 Endless track, 300 Sprocket wheel assembly, 301 Sprocket wheel shaft, 310 Central opening, 320 Rim, 330a, 330b Engagement element, 340a, 340b Intermediate annular rim portion, 345; Central annular channel, 350a, 350b; Intermediate annular rim portion, 360a, 360b; Recess, 400; Carcass, 401; Inner portion, 402; Inner surface, 403; Outer portion, 404; Outer surface, 406; First lateral surface, 408; Second lateral surface, 410a; First drive lug, 410b; Second drive lug, 420; Guide lug, 430a; First recess, 430b; Second recess, 440a; First wheel path, 440b; Second wheel path, 502; Drive zone, 504; First wheel path zone, 506; Guide zone, 508; Second wheel path zone, 510; Drive zone, 556 Longitudinal lines, 561, 561', 561'', 561''', 562, 562', 562'', 562''', 563, 563', 563'', 563''', 564, 564', 564'', 564''', 571, 571', 571'', 571''', 572, 572', 572'', 572''', 573, 573', 573'', 573''' Lateral distances, 591, 592, 593, 594 Simplified diagram, 610 Outer lug, 620 Channel, 710 Outer lug, 711, 712, 713 Zone, 720 Outer lug, 721, 723 Zone, 730 Channel, 731, 732, 733 Channel section, 740 Front wall, 750 Back wall, 751,752,753 wall section, 760 front wall, 761,762,763 Wall portion, 770 Rear wall, 781, 782 Lateral distance, 783, 784 Longitudinal distance, 791 Rearmost point, 792 Forwardmost point, 811, 812, 813, 814, 815, 821, 822, 823, 824 Vertical distance, 861, 862, 863, 86, 865, 871, 872 Horizontal distance, 901 Guide lug, 902 First drive lug, 903 Second drive lug, 910 Member, 912 Guide portion, 913 Curved end, 914 Reinforcing portion, 915 Fillet, 916 Curved end, 920 Reinforcing cable, 920 Reinforcing cord, 1000 Military vehicle, 1002 Sprocket wheel, 1003 Road wheel, 1061, 1062, 1063 Lateral distance, 1100 caterpillar, 1199 caterpillar, 1310 member, 1312 guide part, 1314 reinforcement part,

Claims

1. An endless track for a track system, the endless track being engageable with a wheel of the track system, the endless track comprising: a polymer carcass, an outer portion having an outer surface for contacting the ground; an inner portion having an inner surface opposite the outer surface; a first lateral surface of the polymer carcass extending between the inner surface and the outer surface; and a second lateral surface of the polymer carcass opposite the first lateral surface and extending between the inner surface and the outer surface; a polymer carcass comprising: a plurality of drive lugs configured to engage the wheel, the drive lugs being disposed on the inner surface adjacent the first and second lateral faces, the drive lugs extending radially inward from the inner surface and spaced longitudinally from one another along the inner surface; the plurality of drive lugs includes a first drive lug disposed proximate the first lateral surface and a second drive lug disposed proximate the second lateral surface; A plurality of drive lugs; a plurality of elements disposed within the carcass, the elements extending laterally within the inner portion of the carcass and spaced longitudinally from one another along the carcass; A given member from the plurality of members comprises: a guide portion configured to engage the wheel and extending radially inward from the inner surface of the inner portion of the carcass; a reinforcing portion located within the inner portion of the carcass and extending laterally between at least the first drive lug and at least the second drive lug, the reinforcing portion being configured to reinforce the inner portion of the carcass and support the weight of the wheel; having Multiple components and Equipped with endless tracks.

2. The track of claim 1 , wherein the given member is a T-shaped member.

3. The endless track according to claim 1 or 2, wherein the guide portion and the reinforcing portion are integrally formed.

4. 4. The track of claim 1, wherein the given member is made from a rigid material.

5. The plurality of members are a plurality of first members, and the endless track is at least one second member configured to reinforce the carcass, the second member extending longitudinally along the length of the carcass and around the plurality of first members within the inner portion of the carcass; Thereby, the reinforcing portion is located between the inner surface of the inner portion and the at least one second member. The endless track of claim 1 , further comprising:

6. The endless track of claim 5 , wherein the at least one second member is a plurality of second members arranged in at least one layer of second members.

7. The endless track of claim 6 , wherein the at least one layer of the second member is a layer of reinforcing cords.

8. 8. The endless track of claim 1, wherein the carcass further includes a guide lug disposed on the inner surface between the first drive lug and the second drive lug for guiding the wheel, the guide portion extending within the guide lug.

9. the inner surface defines a wheel path located laterally between the first drive lug and the guide lug, the wheel path configured to engage the wheel; the wheel path has a first width on the inner surface of the inner portion; the guide lug has a second width on the inner surface of the inner portion; the first drive lug has a third width; The endless track of claim 8 , wherein the carcass has a fourth width.

10. 10. The track of claim 9, wherein the first width is 137.5 mm.

11. 10. The track of claim 9, wherein the first width is 149.2 mm.

12. 10. The track of claim 9, wherein the first width is between 120 mm and 155 mm.

13. 10. The track of claim 9, wherein the second width is 35 mm.

14. 10. The track of claim 9, wherein the second width is less than 40 mm.

15. 10. The track of claim 9, wherein the second width is between 20 mm and 80 mm.

16. 10. The track of claim 9, wherein a ratio of the second width to the first width is between 0.22 and 0.

35.

17. 10. The track of claim 9, wherein a ratio of the second width to the fourth width is between 0.06 and 0.

08.

18. 10. The track of claim 9, wherein a ratio of the first width to the fourth width is between 0.21 and 0.

28.

19. 10. The track of claim 9, wherein a ratio of the third width to the fourth width is between 0.21 and 0.

19.

20. 10. The track of claim 9, wherein a ratio of the second width to the first width is less than 0.

4.

21. 10. The track of claim 9, wherein a ratio of the second width to the fourth width is less than 0.

85.

22. 22. The endless track of claim 1, wherein the track further includes a plurality of non-linear outer lugs extending radially outward from the outer surface of the outer portion and spaced longitudinally from one another along the outer surface.

23. 23. The endless track of claim 22, wherein the plurality of nonlinear lugs includes a first nonlinear outer lug having a nonlinear section extending laterally between the first and second lateral surfaces.

24. 24. The track of claim 23, wherein the nonlinear section is a chevron section.

25. 25. The endless track of claim 23 or 24, wherein the first non-linear outer lug further includes at least one linear section disposed proximate at least one of the first and second lateral surfaces.

26. 26. The endless track of claim 25, wherein the at least one linear section includes a first linear section and a second linear section, the first linear section disposed proximate one of the first and second lateral faces and the second linear section disposed proximate the other of the first and second lateral faces.

27. 27. The track of any one of claims 22 to 26, wherein the plurality of non-linear lugs define a bidirectional pattern.

28. 28. The endless track of claim 1, wherein the wheel is a sprocket wheel, the sprocket wheel configured to engage the plurality of drive lugs to transfer force to the endless track.

29. 29. The endless track of claim 28, wherein the sprocket wheel includes a rim and a plurality of engagement elements extending laterally away from and circumferentially spaced along the rim, the plurality of engagement elements configured to engage the plurality of drive lugs in an internal drive arrangement.

30. 30. The endless track of claim 29, wherein the plurality of engagement elements are circumferentially spaced along the rim according to a first pitch and the plurality of drive lugs are longitudinally spaced along the inner surface according to a second pitch, the first pitch being different from the second pitch.

31. 31. The track of claim 30, wherein the second pitch is less than the first pitch.

32. 31. The track of claim 30, wherein the second pitch is greater than the first pitch.

33. 33. The track of any one of claims 1 to 32, wherein the track system is operably connected to an engine of a vehicle.

34. 34. The track of claim 33, wherein the vehicle is a military vehicle.

35. 34. The track of claim 33, wherein the vehicle is an agricultural vehicle.

36. 1. A kit for a track system, comprising: - Wheels and - a polymer carcass; Equipped with The polymer carcass is an outer portion having an outer surface for contacting the ground; an inner portion having an inner surface opposite the outer surface; a first lateral surface of the carcass extending between the inner surface and the outer surface; a second lateral surface of the carcass opposite the first lateral surface and extending between the inner and outer surfaces; a plurality of drive lugs configured to engage the wheel, the drive lugs disposed on the inner surface proximate the first and second lateral faces, the drive lugs extending radially inward from the inner surface and spaced longitudinally from one another along the inner surface; a plurality of drive lugs, the plurality of drive lugs including a first drive lug disposed proximate the first lateral surface and a second drive lug disposed proximate the second lateral surface; a plurality of members disposed within the carcass, the members extending laterally within the inner portion of the carcass and spaced longitudinally from one another along the carcass; A given member from the plurality of members comprises: a guide portion configured to engage the wheel and extending radially inward from the inner surface of the inner portion of the carcass; a reinforcing portion located within the inner portion of the carcass and extending laterally between at least the first drive lug and at least the second drive lug, the reinforcing portion being configured to reinforce the inner portion of the carcass and support a weight of the wheel; and a plurality of guide lugs configured to guide the wheel and disposed on the inner surface between the first drive lug and the second drive lug, the guide portion extending within a given guide lug from the plurality of guide lugs; Including, the inner surface defines a wheel path located laterally between the first drive lug and the guide lug, the wheel path configured to engage the wheel and having a width corresponding to a width of the wheel.

37. 1. A track system for a vehicle, comprising: a sprocket wheel having a rim and a plurality of engaging elements extending laterally from a longitudinal center plane of said track assembly, said engaging elements defining a plurality of grooves therebetween; - a track engageable with said wheel; Equipped with The endless track is a polymer carcass; The polymer carcass is an outer portion having an outer surface for contacting the ground; an inner portion having an inner surface opposite the outer surface; a first lateral surface of the carcass extending between the inner surface and the outer surface; a second lateral surface of the carcass opposite the first lateral surface and extending between the inner and outer surfaces; a plurality of drive lugs configured to engage the wheel, the drive lugs disposed on the inner surface proximate the first and second lateral faces, the drive lugs extending radially inward from the inner surface and spaced longitudinally from one another along the inner surface; a plurality of drive lugs, the plurality of drive lugs including a first drive lug disposed proximate the first lateral surface and a second drive lug disposed proximate the second lateral surface; a plurality of members disposed within the carcass, the members extending laterally within the inner portion of the carcass and spaced longitudinally from one another along the carcass; A given member from the plurality of members comprises: a guide portion configured to engage the wheel and extending radially inward from the inner surface of the inner portion of the carcass; a reinforcing portion located within the inner portion of the carcass and extending laterally between at least the first drive lug and at least the second drive lug, the reinforcing portion being configured to reinforce the inner portion of the carcass and support a weight of the wheel. Multiple components and , including an orbital system.

38. A vehicle, -Main body and an engine supported by said body; at least one orbital system, and The track system is a sprocket wheel having a rim and a plurality of engaging elements extending laterally from a longitudinal center plane of the track assembly, the engaging elements defining a plurality of grooves therebetween; - an endless track engageable with said wheel; Including, The endless track is a polymer carcass; The polymer carcass is an outer portion having an outer surface for contacting the ground; an inner portion having an inner surface opposite the outer surface; a first lateral surface of the carcass extending between the inner surface and the outer surface; a second lateral surface of the carcass opposite the first lateral surface and extending between the inner surface and the outer surface; a plurality of drive lugs configured to engage the wheel, the drive lugs disposed on the inner surface proximate the first and second lateral faces, the drive lugs extending radially inward from the inner surface and spaced longitudinally from one another along the inner surface; a plurality of drive lugs, the plurality of drive lugs including a first drive lug disposed proximate the first lateral surface and a second drive lug disposed proximate the second lateral surface; a plurality of members disposed within the carcass, the members extending laterally within the inner portion of the carcass and spaced longitudinally from one another along the carcass; A given member from the plurality of members comprises: a guide portion configured to engage the wheel and extending radially inward from the inner surface of the inner portion of the carcass; a reinforcing portion located within the inner portion of the carcass and extending laterally between at least the first drive lug and at least the second drive lug, the reinforcing portion being configured to reinforce the inner portion of the carcass and support a weight of the wheel. A plurality of members; Including, vehicles.

39. A track member engageable with a wheel, the track comprising a polymer carcass including an outer portion having an outer surface, an inner portion having an inner surface, a first plurality of drive lugs disposed on the inner surface proximate a first lateral edge of the inner portion, and a second plurality of drive lugs disposed on the inner surface proximate a second lateral edge of the inner portion, the member configured to engage the wheel, a guide portion extending from the inner surface of the inner portion of the carcass and extending away from the outer surface; a reinforcing portion located within the inner portion of the carcass and extending laterally between one of the plurality of first drive lugs and one of the plurality of second drive lugs, the reinforcing portion being configured to reinforce the inner portion of the carcass and support a weight of the wheel.

40. 40. The member of claim 39, wherein the member is a T-shaped member.

41. 41. A member according to claim 39 or 40, wherein the guiding portion and the reinforcing portion are integrally formed.

42. 42. A member according to any one of claims 39 to 41, wherein the member is made from a rigid material.

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