elastic track
By staggering or overlapping the protrusions of adjacent core bones in the elastic track, and by setting protrusions and recesses of varying lengths, the problem of vertical vibration when the rollers cross is solved, and the flexibility and durability of the track are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- 崔镕宰
- Filing Date
- 2022-01-29
- Publication Date
- 2026-05-29
AI Technical Summary
In existing elastic tracks, the rollers tend to vibrate up and down when they cross over the protruding part of the core, resulting in poor flexibility of the track body and easy cracking of rubber and other elastomers.
In the protrusions of two adjacent cores, the top ends are staggered or overlapped, and protrusions of different lengths are provided to form notches and recesses to support the rolling path and reduce the up-and-down vibration of the rollers.
It improves the flexibility of the track body, reduces the vertical vibration of the rollers between the core members, extends the track's durability, and reduces the risk of rubber cracking.
Smart Images
Figure CN115320737B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to an elastic track that can reduce the up-and-down vibration of rollers when used in a tracked device. Background Technology
[0002] The elastic track for the track device includes: a track body made of an elastomer such as rubber; and a core embedded in the track body at approximately equal intervals in the track rotation direction. In addition, on both sides of the inner circumference of the track body, i.e., on the track width direction opposite to the ground contact side, there are rolling paths for rollers. When the track body rotates, the left and right wheel portions of the rollers roll on each rolling path.
[0003] In this type of elastic track, protrusions extending from both sides of each core in the track rotation direction are provided corresponding to each rolling path. Each rolling path is supported inside the track body by these protrusions. On the other hand, on both sides of each core in the track rotation direction, long protrusions with longer extensions and short protrusions with shorter extensions are alternately arranged from the core. When the track body rotates, either the left or right wheel body of the roller rolls by means of either the left or right protrusion.
[0004] Existing technical documents
[0005] Patent documents
[0006] Patent Document 1: Japanese Utility Model Application Publication No. 6-71375 Summary of the Invention
[0007] The problem that the invention aims to solve
[0008] In such an elastic track, since the roller is located on either the left or right extension, even if one side crosses between the extensions of two adjacent cores while the roller rolls on the rolling path, the roller will not fall between the extensions, thus preventing vibration caused by the up-and-down movement of the roller.
[0009] However, in the past, the left and right width of the protruding part of each core bone of the elastic track was roughly the same as the left and right width of the rolling track. The left and right width of each protruding part was relatively wide, and the interval between the top of the protruding parts of two adjacent core bones was short. Therefore, there were problems such as poor flexibility of the track body when bending between adjacent core bones and easy cracking of the rubber and other elastomers that make up the track body.
[0010] In view of the above problems, the object of the present invention is to provide an elastic track that, while ensuring the flexibility of the track body, can reduce the up-and-down vibration of the rollers when crossing the protrusions of each core.
[0011] Technical means for solving problems
[0012] The present invention comprises: a track body mainly composed of an elastic material; and core bones embedded in the track body at approximately equal intervals in the track rotation direction, having rolling paths for rollers on both sides of the track width direction on the opposite side of the ground contact side of the track body; each core bone having protrusions on both sides of the track rotation direction that extend from each core bone to both sides of the track rotation direction to support each rolling path; at least the top ends of each protrusion of each adjacent core bone corresponding to each rolling path being staggered from each other in the track width direction within the width of each rolling path; and the top ends of the protrusions of one core bone and the top ends of the protrusions of the other core bone being arranged close to or overlapping in the track rotation direction.
[0013] In each of the protrusions between two adjacent core bones, the end of one protrusion of one core bone corresponding to one rolling path and the top of another protrusion of another core bone corresponding to another rolling path are arranged close to or overlap in the track rotation direction.
[0014] In each of the protrusions between two adjacent core bones, the top end of each protrusion of one core bone corresponding to each of the rolling paths and the top end of another protrusion of the other core bone corresponding to each of the rolling paths are arranged close to or overlapping each other in the track rotation direction.
[0015] On the opposite side of the offset direction of the protrusions corresponding to the rolling path between two adjacent core bones, a notch is provided in the rolling path that is separated from the protrusions of the adjacent core bones in the track rotation direction.
[0016] Each core bone has two protrusions corresponding to each rolling path, one long protrusion and one short protrusion with different protrusion lengths, and the long protrusion and the short protrusion are arranged approximately symmetrically with respect to the core bone.
[0017] The extension lengths of the two protrusions corresponding to the rolling paths of two adjacent cores can be approximately the same. Each protrusion is a thin, flat shape in the track thickness direction and is sometimes located near the opposite side of the ground contact surface of each rolling path.
[0018] Alternatively, each core bone may have a central support portion in a generally coplanar manner at the midpoint of the track rotation direction between the protrusions, the central support portion supporting the rolling path, and the rolling path side of the protrusions and the central support portion being continuous in the track rotation direction.
[0019] Alternatively, the track body may have recesses on both sides of the track width direction of each rolling path between adjacent cores, extending from the rolling path side to the contact surface side, wherein the rolling path is a continuous flat shape in the track rotation direction via the recesses.
[0020] Invention Effects
[0021] The present invention has the following advantages: it can ensure the flexibility of the track body and reduce the vertical vibration of the rollers when they cross the protrusions of each core. Attached Figure Description
[0022] Figure 1 This is a side view showing the track device according to the first embodiment of the present invention.
[0023] Figure 2 This is a three-dimensional view of the opposite side of the elastic track that is in contact with the ground.
[0024] Figure 3 This is a top view of the side opposite to the ground contact point of the elastic track.
[0025] Figure 4 This is a cross-sectional view of the main part of the elastic track.
[0026] Figure 5 This is a front cross-sectional view of the elastic track.
[0027] Figure 6 This is a side sectional view of the elastic track.
[0028] Figure 7 This is a top view of the contact surface side of the elastic track.
[0029] Figure 8 This is a 3D diagram of the core.
[0030] Figure 9 This is a top view of the core.
[0031] Figure 10 This is the front view of the core.
[0032] Figure 11 This is a top view showing the core of the second embodiment of the present invention.
[0033] Figure 12 This is a top view showing the core of the third embodiment of the present invention.
[0034] Figure 13 This is a top view showing the core of the fourth embodiment of the present invention.
[0035] Figure 14 This is a top view showing the core of the fifth embodiment of the present invention.
[0036] Figure 15 This is a top view showing the core of the sixth embodiment of the present invention.
[0037] Figure 16 This is a top view showing the core of the seventh embodiment of the present invention.
[0038] 4. Elastic track; 5. Roller; 7, 8. Wheel body; 9. Track body; 9a. Ground contact surface; 9b. Opposite ground contact surface; 10. Core frame; 12, 13. Rolling track; 14. Engaging part; 20, 21. Guide protrusion; 24-27. Extension; 24a-27a. Notch; 28, 29. Intermediate support part; 30, 31. Recess. Detailed Implementation
[0039] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Figures 1-10 This invention illustrates a first embodiment. For example... Figures 1 to 7 As shown, the track device 1 includes a sprocket-type drive wheel 2 and a driven wheel 3 arranged front and rear, and an elastic track 4 rotatably wound across these drive wheels 2 and driven wheels 3. Furthermore, the elastic track 4 is guided by a plurality of rollers 5 arranged between the drive wheels 2 and driven wheels 3. Figure 4 As shown, the roller 5 has wheel bodies 7 and 8 on the left and right sides of the torso 6. Each wheel body 7 and 8 can rotate either as a whole around the axis of the torso 6, or rotate separately around the axis of the torso 6.
[0040] The elastic track 4 includes: an annular track body 9, which is mainly composed of an elastomer such as rubber; cores 10 in the track width direction (left-right direction), which are embedded in the track body 9 at approximately equal intervals in the track rotation direction; and tensile bodies 11 such as steel wires, which are embedded in the track body 9 in the track rotation direction on the ground surface 9a side of the track body 9 relative to each core 10. On the opposite ground surface 9b side, which is the inner circumference side of the track body 9, a pair of left and right rolling tracks 12 and 13 are provided in the track rotation direction, corresponding to the left and right wheel portions 7 and 8 of the rollers 5.
[0041] On the track body 9, engagement holes 15 are provided between the engagement portions 14 of each core rib 10 at the center of the track width direction, and drive tread blocks 16 and 17 are provided on both sides of the contact surface 9a relative to each engagement hole 15 in the track width direction. Each drive tread block 16 and 17 has a wide portion 18 on the inner side near the engagement hole 15 and a narrow portion 19 on the outer side away from the engagement hole 15. The drive tread blocks 16 and 17 on both sides are arranged in a serrated shape, alternating left and right in the track rotation direction. The drive tread blocks 16 and 17 are arranged alternately left and right in correspondence with the engagement portions 14 and engagement holes 15.
[0042] The core rib 10 is cast or forged and includes: a locking portion 14 disposed between each locking hole 15 and engaging with the protrusions on the outer periphery of the drive wheel 2 and the driven wheel 3; guide protrusions 20 and 21 that protrude from both sides of the locking portion 14 in the track width direction toward the opposite ground surface 9b in the track thickness direction and guide the drive wheel 2, the driven wheel 3, and the roller 5 from the left and right sides; flat wings 22 and 23 that protrude from each guide protrusion 20 and 21 toward the outer side in the track width direction; and extension portions 24 to 27 that are provided corresponding to each wing portion 22 and 23 and protrude from each wing portion 22 and 23 toward both sides in the track rotation direction.
[0043] The guide protrusions 20 and 21 are formed such that the drive wheels 2 and driven wheels 3 are guided from both sides on the inner surface, and the wheel bodies 7 and 8 of the rollers 5 are guided from the inside on the outer surface. The top side is formed into a generally rectangular shape that is longer in the track rotation direction when viewed from above. It should be noted that the top side of the guide protrusions 20 and 21 can also be other shapes such as a generally rhomboid shape that is longer in the track rotation direction when viewed from above.
[0044] Each of the protrusions 24 to 27 internally supports the rolling paths 12 and 13 of the track body 9 and is respectively provided on both sides of the core frame 10 in the track rotation direction, corresponding to the rolling paths 12 and 13 on both sides of the track body 9. Each of the protrusions 24 to 27 is a thin, flat shape in the track thickness direction and is positioned on the opposite side of the ground contact surface 9b of the wings 22 and 23 of the core frame 10, in a manner that supports the rolling paths 12 and 13 internally.
[0045] like Figures 8-10 As shown, on the wings 22 and 23 of each core rib 10, near the outer side of the guide protrusions 20 and 21, there are intermediate support portions 28 and 29, with protrusions 24 to 27 extending from these intermediate support portions 28 and 29 towards both sides in the track rotation direction. The intermediate support portions 28 and 29, like the protrusions 24 to 27, serve to support the rolling paths 12 and 13 of the track body 9 from within. The intermediate support portions 28 and 29 are generally rectangular or rectangular in shape, longer in the track rotation direction. Furthermore, each protrusion 24 to 27 protrudes from the ground-opposite surface 9b side of the intermediate support portions 28 and 29 towards both sides in the track rotation direction. The ground-opposite surface 9b side of the intermediate support portions 28 and 29 and the protrusions 24 to 27 are formed at approximately the same height and are flat.
[0046] Each core rib 10 has four protrusions 24-27 that protrude from each intermediate support portion 28, 29 toward both sides in the track rotation direction, corresponding to the left and right rolling paths 12, 13. Among the four protrusions 24-27 of each core rib 10, the protrusion 25 corresponding to one rolling path 12 and the protrusion 26 corresponding to another rolling path 13 have approximately the same extension length in the track rotation direction, which is A; the protrusion 24 corresponding to one rolling path 12 and the protrusion 27 corresponding to another rolling path 13 have approximately the same extension length in the track rotation direction, which is B.
[0047] The extension length A of the protrusions 25 and 26 is longer than the extension length B of the protrusions 24 and 27. Moreover, between two adjacent core bones 10 in the track body 9, there is an overlapping portion where the top ends of the protrusions 25 and 26 overlap each other in the track rotation direction by an overlap amount C.
[0048] In this way, between two adjacent core bones 10, by overlapping the top ends of the protrusions 25 corresponding to one rolling path 12 and the top ends of the protrusions 26 corresponding to the other rolling path 13 with an overlap amount C in the track rotation direction, when the track body 9 rotates, the left and right wheel portions 7 and 8 of the rollers 5 also move sequentially across the two core bones 10 from one side to the other via this overlapping portion as they roll on the rolling paths 12 and 13 of the track body 9. This prevents vertical vibration caused by the rollers 5 falling between the protrusions 25 and 26. Therefore, even when the track body 9 rotates, the vertical vibration of the rollers 5 between the core bones 10 can be suppressed as much as possible.
[0049] Furthermore, the top ends of the protrusions 24-27 of each core rib 10 corresponding to each rolling path 12, 13 in the track rotation direction are offset from each other in the track width direction within the width of each rolling path 12, 13. Therefore, the flexibility of the track body 9 when it is bent and wound around the drive wheel 2, driven wheel 3, etc. is improved, resulting in reduced cracking and peeling of the elastomer of the track body 9 and improved durability.
[0050] That is, each intermediate support portion 28, 29 has a longer extension portion 25, 26 with a longer extension length A and a shorter extension portion 24, 27 with a shorter extension length B on both sides along one diagonal direction. The top ends of each extension portion 24-27 are staggered in the track width direction within the width of the rolling paths 12, 13. The longer extension portions 25, 26 are located on the side away from the guide protrusions 20, 21, and the shorter extension portions 24, 27 are located on the side closer to the guide protrusions 20, 21. The intermediate support portions 28, 29, the longer extension portions 25, 26, and the shorter extension portions 24, 27 are arranged approximately symmetrically.
[0051] It should be noted that the long protrusions 25 and 26 can also be configured on the side closer to the guide protrusions 20 and 21, and the short protrusions 24 and 27 can also be configured on the side away from the guide protrusions 20 and 21.
[0052] Between two adjacent core bones 10, on the side where the extensions 24 and 26 of one core bone 10 are offset in opposite directions, notches 24a and 26a are provided in the rolling path 12 and 13, which are separated from the extensions 25 and 27 of the other core bone 10 in the track rotation direction. Within the width of the rolling path 12 and 13, one long extension 25 and 26 faces the other notch 24a and 27a, and the other short extension 24 and 27 faces the other notch 25a and 26a in the track rotation direction.
[0053] Therefore, between each core rib 10, the protrusions 24-27 and the notches 24a-27a are offset in the track rotation direction within the rolling paths 12 and 13. Consequently, the interval between the top of each protrusion 24-27 and the innermost wings 22 and 23 of the notches 24a-27a becomes longer, forming an elastic portion filled with an elastomer such as rubber in this longer interval. Therefore, when the track body 9 bends, the longer elastic portion between adjacent core ribs 10 bends, improving the flexibility of the track body 9, preventing cracking, and increasing its durability.
[0054] Furthermore, between the protrusions 24-27 and the notches 24a-27a of the track body 9, the elastic body and other components of the track body 9 on the rolling road 12 and 13 sides become thicker. However, since the interval between the top of each protrusion 24-27 and the innermost wing 22 and 23 of the notches 24a-27a becomes longer, recesses 30 and 31 are provided in this part. The recesses 30 and 31 are recessed from the rolling road 12 and 13 sides toward the contact surface 9a side on both sides in the track width direction of the rolling roads 12 and 13. Therefore, the flexibility of the track body 9 between the core ribs 10 can be improved by the recesses 30 and 31.
[0055] Furthermore, the recesses 30 and 31 extend from both sides of the track width direction into a portion of the rolling paths 12 and 13, forming a continuous, flat surface between the recesses 30 and 31 in the track rotation direction. Therefore, when passing through the recesses 30 and 31, the roller 5 can be prevented from vibrating up and down on the rolling paths 12 and 13. It should be noted that the recess 30 is connected to a recessed groove 33, which extends continuously from near the rolling path 12 towards the outer end of the track body 9 on the opposite grounding surface 9b.
[0056] For example, such as Figure 9As shown, when the interval between two adjacent core bones 10 is set as D, and the overlap of the top ends of the protrusions 25 and 26 of each core bone 10 at approximately the center of the interval D is set as C, the protrusion length A of each protrusion 25 and 26 is approximately (D+C) / 2.
[0057] In this case, since the distance E from the tip of the protrusions 25 and 26 to the corresponding part of the core 10 is D-A, the protrusion length B of the protrusions 24 and 27 is preferably about half of it, approximately (D-A) / 2. Therefore, the distance F between the protrusions 24 and 27 and the protrusions 25 and 26 of each core 10 of each rolling path 12 and 13 is approximately (D-A) / 2.
[0058] Therefore, between the protrusions 24, 27 and 25, 26 of each core rib 10 corresponding to each rolling path 12, 13, a gap F approximately the same as the protrusion length B of the protrusions 24, 27 can be formed, allowing the elastic material between the protrusions 24 and 27 to bend reasonably when the track body 9 bends. It should be noted that the dimensional relationship of A to F in this embodiment is only one example and various modifications can be made.
[0059] Figure 11 A second embodiment of the present invention is shown. In this embodiment, the extension length A of the protrusions 25 and 26 of each core rib 10 is approximately half the distance D between the core ribs 10, and the tips of the protrusions 25 and 26 are aligned on a straight line 35 approximately at the center between the core ribs 10. That is, the overlap C of the tips of the protrusions 25 and 26 is configured such that C = 0. The extension length B of the protrusions 24 and 27 is approximately half the extension length A of the protrusions 25 and 26. Other structures are the same as in the first embodiment.
[0060] In this case, when the roller 5 rolls on the rolling paths 12 and 13, the roller 5 moves from the protrusion 25 of one core rib 10 to the protrusion 26 of another core rib 10, thus preventing vibration caused by the up-and-down movement of the roller 5 between the core ribs 10.
[0061] Figure 12 The third embodiment of the present invention is shown. In this embodiment, the extension length A of the protrusions 25, 26 of each core rib 10 is shorter than half the interval D between the core ribs 10, and the top ends of each protrusion 25, 26 are arranged close together at a small interval G in the track rotation direction on the approximately central side between the core ribs 10. Other structures are the same as in the first and second embodiments.
[0062] In this case, when the diameter of the roller 5 is large enough compared to the gap G between the protrusions 25 and 26, when the roller 5 rolls on the rolling paths 12 and 13, the roller 5 will not fall into the gap between the protrusions 25 and 26, but will move from the protrusion 25 of one core rib 10 to the protrusion 26 of the other core rib 10. Therefore, vibration caused by the up-and-down movement of the roller 5 between the core ribs 10 can be prevented.
[0063] Figure 13 The fourth embodiment of the present invention is shown. In this embodiment, the extension length A of the protrusions 24-27 of each core rib 10 is slightly longer than half of the interval D between the core ribs 10. On the approximately central side between the core ribs 10 on each rolling track 12, 13, the top ends of each protrusion 24-27 are arranged to overlap by an overlap amount C in the track rotation direction. Other structures are the same as those in the first to third embodiments.
[0064] In this way, even when the top ends of the corresponding protrusions 24, 25 and protrusions 26, 27 of each rolling track 12, 13 overlap by an overlap amount C, vibration caused by the up-and-down movement of the rollers 5 between the core 10 can be prevented. In particular, since the overlapping portions of the protrusions 24 to 27 are respectively on each rolling track 12, 13 on both sides in the track width direction, the left and right wheel body portions 7, 8 of the rollers 5 can be supported equally, thereby further reducing the up-and-down movement of the rollers 5 on both sides.
[0065] It should be noted that, in this case, since the side edges 24b to 27b of each protrusion 24 to 27 are close together at a very small interval, therefore... Figure 13 As shown by the double-dotted line, it is preferable to increase the inclination angle of the side edges 24b-27b of the protrusions 24-27 relative to the track rotation direction, or to shorten the dimension of the top portion of the protrusions 24-27 in the track width direction, and increase the interval in the track width direction between the top portions of the overlapping parts of the protrusions 24-27. This can prevent cracking of the track body 9 between each protrusion 24-27.
[0066] Figure 14 The fifth embodiment of the present invention is shown. In this embodiment, the protrusion length A of the protrusions 24-27 of each core rib 10 is set to about half of the interval D between the core ribs 10, and the overlap C = 0 is configured such that the tops of each protrusion 24-27 are arranged on a straight line 35 approximately at the center between the core ribs 10 along each rolling path 12, 13. Other structures are the same as those in the first to fourth embodiments.
[0067] In this case, the protrusions 24 to 27 of each core rib 10 can be provided continuously in the track width direction on each rolling path 12, 13, so that vibration caused by the up-and-down movement of the roller 5 between the core ribs 10 can be prevented.
[0068] Figure 15 The sixth embodiment of the present invention is shown. In this embodiment, the extension length A of the protrusions 24-27 of each core rib 10 is shorter than half the interval D between the core ribs 10, and the top ends of each protrusion 24-27 are arranged close together at a small interval G in the track rotation direction on the approximately central side between the core ribs 10. Other structures are the same as those in the first to fifth embodiments.
[0069] In this case, when the diameter of the roller 5 is sufficiently large compared to the gap G between the protrusions 24 and 27, when the roller 5 rolls on the rolling paths 12 and 13, the roller 5 will not fall into the gap between the protrusions 24 and 27, but will move from the protrusions 24 and 26 of one core rib 10 to the protrusions 25 and 27 of another core rib 10. Therefore, vibration caused by the up-and-down movement of the roller 5 between the core ribs 10 can be prevented.
[0070] Figure 16 The seventh embodiment of the present invention is shown. Figure 16 The protrusions 24 and 25 in (a) are wide on the base 24d and 25d sides and narrow on the top 24e and 25e sides, and the top 24e and 25e sides of each protrusion are staggered in the track width direction. Figure 16 The protrusions 24 and 25 of the middle (b) are provided with inclined sides 24h and 25h on opposite sides of each core rib 10, connecting the base side portions 24f and 25f and the top side portions 24g and 25g, thus offsetting the top sides of each protrusion 24 and 25 in the track width direction.
[0071] In this way, the top ends of each extension 24 and 25 can be staggered in the track width direction.
[0072] The various embodiments of the present invention have been described in detail above, but the present invention is not limited to these embodiments and various modifications can be made. For example, in the embodiments, the shape, structure, and configuration of the drive tread blocks 16 and 17 that form two rows of tread blocks on the outer periphery of the track body 9 can be arbitrarily changed.
[0073] In addition, in each embodiment, protrusions 24 to 27 are provided on both sides of each core rib 10 to prevent the roller 5 from vibrating up and down when it moves across each core rib 10. However, it is also possible to add a function to prevent the core ribs 10 from shifting laterally.
[0074] The protrusions 24-27 of the core rib 10 and the intermediate support portions 28 and 29 may also be wholly or partially exposed on the rolling track 12 and 13 side. In this case, each rolling track 12 and 13 preferably has the ground-opposite side 9b of the protrusions 24-27 configured to be substantially coplanar with the other portions, and the substantially coplanar portions are continuous in the track rotation direction.
[0075] The offset portions of the core rib 10 corresponding to the rolling tracks 12 and 13, 24-27, are located within the width of the rolling tracks 12 and 13. Therefore, they only need to be offset within the width of the rolling tracks 12 and 13 in the track width direction. In this case, the offset portions 24-27 corresponding to the rolling tracks 12 and 13 can be configured to be either contained within the width of the rolling tracks 12 and 13, or partially protrude outwards from the width of the rolling tracks 12 and 13.
[0076] On the protrusions 24-27 of the core rib 10 corresponding to the rolling paths 12 and 13, they can be arranged approximately symmetrically with respect to the core rib 10, or they can be arranged asymmetrically. In addition, in the case of symmetrical arrangement, in addition to point symmetry, they can also be arranged linearly symmetrically.
Claims
1. An elastic track, characterized in that, have: The track body is mainly composed of elastic material; and the core is embedded within the track body at approximately equal intervals in the direction of track rotation. On both sides of the track width direction on the opposite side of the ground contact surface of the track body, there are rolling paths for rollers. On both sides of each core bone in the track rotation direction, there are protrusions extending from each core bone in the track rotation direction to support each rolling path. Each core bone has two protrusions corresponding to each rolling path, one long and one short, with different protrusion lengths. The long and short protrusions are arranged approximately point-symmetrically with respect to the core bone. In two adjacent cores, the long extension of one core and the short extension of the other core are positioned on the same rolling path, and At least the top ends of the long and short extensions of two adjacent core bones corresponding to the respective rolling paths are staggered from each other in the width direction of the track within the width of the respective rolling paths. In two adjacent cores, the tips of the long protrusions of one core and the tips of the long protrusions on different rolling paths of the other core are configured close to or overlap in the track rotation direction. In two adjacent cores, the top of the long extension of one core and the top of the short extension on the same rolling path of the other core are provided with a gap in the track rotation direction.
2. The elastic track according to claim 1, characterized in that, Each of the protrusions is a thin, flat shape in the thickness direction of the track and is disposed near the opposite side of the ground contact of each rolling path.
3. The elastic track according to claim 1 or 2, characterized in that, Each core has a central support portion in a generally coplanar manner at the middle of the track rotation direction between the protrusions. The central support portion supports each rolling path, and the rolling path side of each protrusion and the central support portion is continuous in the track rotation direction.
4. The elastic track according to claim 1 or 2, characterized in that, The track body has recesses on both sides of each rolling path in the track width direction between adjacent cores, extending from the rolling path side to the contact surface side, and the rolling path is a continuous flat shape in the track rotation direction via the recesses.
5. The elastic track according to claim 3, characterized in that, The track body has recesses on both sides of each rolling path in the track width direction between adjacent cores, extending from the rolling path side to the contact surface side, and the rolling path is a continuous flat shape in the track rotation direction via the recesses.