Elastic track
By designing a rectangular or flat lateral offset with a longer lateral length to prevent protrusions and roller rolling parts, the problem of reduced durability and vibration absorption of existing elastic tracks is solved, thereby improving the strength and driving force of the track body.
Patent Information
- Application Number
- CN202411055393.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-11-25
AI Technical Summary
The existing elastic track design, which uses lateral offset between the core members to prevent protrusions and roller rolling parts, results in an excessively large track thickness, leading to reduced track durability and vibration absorption.
An elastic track was designed, which uses a laterally longer rectangular or flat lateral offset to prevent protrusions and roller rolling parts, ensuring the strength of the track body in the lateral offset between the core bones, and optimizing the track thickness dimension through the intermediate roller rolling part and inclined surface structure to reduce the bending and damage of the elastic material.
It improves the durability and vibration absorption capacity of the track body, reduces cracks and damage to the elastic material, enhances the driving force and soil removal capacity of the track, and maintains the flexibility and stability of the track.
Smart Images
Figure CN121005058A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to an elastic track mounted on a track device of a construction machine or the like. BACKGROUND
[0002] The elastic track used in the track device is provided with a track body mainly composed of an elastic material such as rubber, and a spine embedded in the track body at substantially equal intervals in the track rotation direction (Patent Literature 1).
[0003] Each spine is provided with an engaging portion disposed between engaging holes of the track body, a guide protrusion disposed on both sides in the track width direction with respect to the engaging portion, a one-side lateral displacement prevention protrusion protruding to one side in the track rotation direction on the outer side in the track width direction with respect to each guide protrusion, and another-side lateral displacement prevention protrusion protruding to the other side in the track rotation direction on the outer side in the track width direction with respect to each guide protrusion, and preventing the adjacent spine from being laterally displaced in the track width direction between the one-side lateral displacement prevention protrusion on the side of the adjacent spine, and the ground surface opposite to the ground surface of the other-side lateral displacement prevention protrusion is set as a rolling surface, and an intermediate roller rolling portion is provided on the spine between the one-side lateral displacement prevention protrusion and the other-side lateral displacement prevention protrusion.
[0004] Each lateral displacement prevention protrusion is a prismatic shape with a dimension in the track thickness direction larger than a dimension in the track width direction, and protrudes from the spine in a manner that the lower surface side of the lateral displacement prevention protrusion aligns with the lower surface of the wing portion of the spine. Also, a convex roller rolling portion with a dimension in the track width direction narrower than the dimension in the track width direction is provided on the upper outer side of the lateral displacement prevention protrusion with the upper surface side of the roller rolling portion becoming a roller rolling path.
[0005] Patent Literature 1: Japanese Patent Application Publication No. 2022-28048
[0006] In this conventional elastic track, the roller rolling portion is integrally provided on the lateral displacement prevention protrusion, and a prescribed mechanical strength corresponding to the functions of the lateral displacement prevention protrusion and the roller rolling portion is ensured. Therefore, there is an advantage that the lateral displacement of the adjacent spines in the track width direction from each other can be prevented.
[0007] However, since the dimension in the track thickness direction of the entire lateral displacement prevention protrusion and the roller rolling portion becomes very large, in the case where the track body is bent between the adjacent spines, the lateral displacement prevention protrusion and the roller rolling portion with a large dimension in the track thickness direction repeatedly perform bending motion in the elastic material of the track body, and cracks are likely to occur in the lateral displacement prevention protrusion of the track body and the portion corresponding to the tip side of the roller rolling portion, and there is a problem that the durability of the track body is reduced.
[0008] In particular, the lateral displacement prevention protrusions and the roller rolling portions are protruded larger from the core bones to both sides in the track rotation direction in a manner of overlapping each other in the track rotation direction between adjacent core bones, and the track width direction dimension of the roller rolling portion on the lateral displacement prevention protrusion is narrowed, and thus a crack easily enters the track body through the roller rolling portion.
[0009] Further, since the track thickness direction dimension of the entire roller rolling portion included in the lateral displacement prevention protrusion becomes very large, the thickness of the elastic material constituting the driving lug on the ground surface side of the track body is small, and there is a problem that durability and vibration absorption are reduced due to damage of the elastic material of this portion. SUMMARY
[0010] The technical problem to be solved by the present application is to provide an elastic track capable of easily securing strength required to prevent lateral displacement of a track body from each other between core bones, and capable of preventing reduction in durability and vibration absorption of the track body.
[0011] The technical solution adopted by the present application to solve the above technical problem is: an elastic track having a track body mainly composed of an elastic material and core bones embedded in the track body at substantially equal intervals in a track rotation direction, each core bone having: an engaging portion disposed between engaging holes of the track body; a guide protrusion disposed on both sides in a track width direction with respect to the engaging portion; a one-side lateral displacement prevention protrusion protruding to one side in the track rotation direction with respect to each guide protrusion on the outside in the track width direction; and a other-side lateral displacement prevention protrusion protruding to the other side in the track rotation direction with respect to each guide protrusion on the outside in the track width direction and preventing lateral displacement of the core bone in the track width direction between the one-side lateral displacement prevention protrusion of the adjacent core bone side, the ground surface opposite sides of the one-side lateral displacement prevention protrusion and the other-side lateral displacement prevention protrusion being roller rolling portions, and an intermediate roller rolling portion being provided on the core bone between the one-side lateral displacement prevention protrusion and the other-side lateral displacement prevention protrusion, each lateral displacement prevention protrusion being laterally long in that the track width direction dimension from the lateral displacement prevention surface side to the opposite side of the lateral displacement prevention surface is longer than the dimension from the ground surface side to the roller rolling portion.
[0012] Preferably, the roller rolling portion of the one-side lateral displacement prevention protrusion and the roller rolling portion of the other-side lateral displacement prevention protrusion overlap each other in the track rotation direction with respect to the tip end side.
[0013] Preferably, between the one-side lateral displacement prevention protrusion and the other-side lateral displacement prevention protrusion, an intermediate roller rolling portion is convexly provided on a wing portion of the core, a base portion side of each lateral displacement prevention protrusion is integrated with an upper surface of the wing portion and a side surface of the intermediate roller rolling portion, and a ground contact surface side of each lateral displacement prevention protrusion is a tilted surface that is inclined in a manner that a tip end is raised.
[0014] The present application has an advantage in that it can easily ensure the strength required to prevent lateral displacement of the track bodies from each other in the core and can prevent a decrease in durability and a decrease in vibration absorption of the track bodies, compared to the prior art. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 is a side view of a track device of a first embodiment of the present application;
[0016] Figure 2 is a top side perspective view of the elastic track;
[0017] Figure 3 is a top view of the elastic track;
[0018] Figure 4 is a front cross-sectional view of the elastic track;
[0019] Figure 5 is a side cross-sectional view of the elastic track;
[0020] Figure 6 is a side cross-sectional view of an outer roller rolling path side of the elastic track;
[0021] Figure 7 is a bottom view of the elastic track;
[0022] Figure 8 is a bottom side perspective view of the elastic track;
[0023] Figure 9 (a) of FIG. 1 is a top view of the core, Figure 9 (b) of FIG. 1 is a front view of the core;
[0024] Figure 10 is a perspective view of the core;
[0025] Figure 11 is a bottom view of an elastic track of a second embodiment of the present application;
[0026] Figure 12 is a bottom view of an elastic track of a third embodiment of the present application;
[0027] Figure 13is a fourth embodiment of the present application, wherein 13(a) is a front view of a lateral displacement prevention protrusion, and 13(b) is a side view thereof;
[0028] Figure 14 is a fifth embodiment of the present application, wherein 14(a) is a front view of a lateral displacement prevention protrusion, and 14(b) is a front view of another lateral displacement prevention protrusion. DETAILED DESCRIPTION
[0029] Hereinafter, each embodiment of the present application will be explained in detail with reference to the drawings.
[0030] Figures 1 to 10 A first embodiment of the present application is exemplified. As shown in Figure 1 , a track device 1 is provided with a sprocket type drive wheel 2 and a driven wheel 3 arranged in front and back, and an elastic track 4 rotatably wound across the drive wheel 2 and the driven wheel 3. A plurality of idlers 5 that guide the elastic track 4 are arranged between the drive wheel 2 and the driven wheel 3.
[0031] As shown in Figures 2 to 6 , the elastic track 4 is provided with: an annular belt-shaped track body 6 mainly composed of an elastic material 12; a track width direction backbone 7 embedded in the track body 6 at substantially equal intervals in a track rotation direction; and a tensile body 8 such as a steel wire embedded in the track body 6 on a ground surface side of each backbone 7 in the track rotation direction.
[0032] As shown in Figure 4 , Figure 7 , Figure 8 , in the track body 6, engaging holes 9 are provided between each backbone 7 in the center in the track width direction, and in addition, on the ground surface side, drive lugs 10 and lug interstice recesses 11 formed between each drive lug 10 are alternately arranged in a zigzag shape in the track rotation direction.
[0033] The drive lug 10 is provided with: a central lug portion 13 in the track width direction arranged between the engaging holes 9 corresponding to each backbone 7; and a side portion lug portion 14 arranged in one side in the track width direction with respect to the central lug portion 13, and the lug interstice recess 11 is arranged in the other side in the track width direction with respect to the central lug portion 13. Therefore, the side portion lug portion 14 is alternately arranged on one side in the track width direction with respect to the central lug portion 13, and the lug interstice recess 11 is alternately arranged on the other side in the track width direction with respect to the central lug portion 13. Note that the side portion lug portion 14 and the lug interstice recess 11 are alternately arranged in the track rotation direction and the track width direction.
[0034] The center block portion 13 has a length that is slightly longer than the dimension of the track width direction of the engaging hole 9, and is disposed in the track width direction substantially in parallel with the engaging portion 15 of each core bone 7. The side block portion 14 is alternately disposed on either side of the track width direction in correspondence with each center block portion 13.
[0035] Each side block portion 14 has a wide block portion 17 disposed on the side close to the center block portion 13 across the width of the wings 16 of two core bones 7 adjacent in the track rotation direction, and a narrow block portion 18 disposed on the side away from the center block portion 13 across the middle portions of two core bones 7 narrower than the wide block portion 17. The wide block portion 17 and the narrow block portion 18 are connected integrally via a boundary block portion 19 in which the width changes from the wide block portion 17 to the narrow block portion 18. As shown in Figure 7 the drawing, the block top of the wide block portion 17 corresponds substantially to the maximum dimension between the wings 16 of two core bones 7, and the block top of the narrow block portion 18 corresponds substantially to the width between the middle portions of the wings 16 of two core bones 7.
[0036] The block-to-block recess 11 is a recess for characterizing the rise of the side block portion 14 from the ground surface of the track body 6, and is disposed between the side block portions 14 on both sides in the track rotation direction, and across the engaging hole 9 in the track width direction. The block-to-block recess 11 has a narrow recess 20 disposed on the side close to the engaging hole 9, and having a width substantially the same as or narrower than the center block portion 13 between two center block portions 13, and a wide recess 21 disposed on the outside of the narrow recess 20, and having a width wider than the narrow recess 20. On the wide recess 21 side, a jam-preventing protrusion 22 for preventing the jamming of stones, mud, and the like between the side block portions 14 is provided in the track rotation direction. The height of the jam-preventing protrusion 22 is slightly lower than the side block portion 14. Note that the drive block 10, the block-to-block recess 11, and the jam-preventing protrusion 22 are substantially line-symmetrical with respect to the center line of the track width direction passing through the center of the engaging hole 9.
[0037] As shown in Figure 7 , Figure 8As shown, the core 7 is cast or forged, and has: engaging portions 15 disposed between the engaging holes 9 of the track body 6, and engaged with the engaging projections of the outer periphery of the drive wheel 2 and the driven wheel 3; guide projections 25 projecting in the track thickness direction from both sides of the engaging portions 15 toward the opposite side of the ground surface, guiding the drive wheel 2 and the driven wheel 3 from both sides; flat wing portions 16 projecting from each guide projection 25 toward the outside in the track width direction; and one side lateral displacement prevention projection 26 and the other side lateral displacement prevention projection 27 projecting from each wing portion 16 toward both sides in the track rotation direction. Note that the core 7 can also be manufactured by methods other than casting or forging.
[0038] As shown in Figure 5 , Figure 9 , Figure 10 , the one side lateral displacement prevention projection 26 and the other side lateral displacement prevention projection 27 serve as the roller rolling portions 28, 29, and are flat roller rolling portions 28, 29 on the opposite side of the ground surface. Between the one side lateral displacement prevention projection 26 and the other side lateral displacement prevention projection 27, on the opposite side of the ground surface of the wing portion 16 of the core 7, the roller rolling portions 28, 29 and the flat intermediate roller rolling portion 30 are provided in a convex shape, and these constitute the outer side roller rolling path 31 for rolling of the roller 5. The intermediate roller rolling portion 30 is rectangular in plan view.
[0039] As shown in Figure 5 , each lateral displacement prevention projection 26, 27 is a laterally long rectangular shape or a laterally long flat shape in which the dimension B in the track width direction from the lateral displacement prevention surface side 26b, 27b to the opposite lateral displacement prevention surface side 26c, 27c is longer than the dimension A from the ground surface side 26a, 27a to the roller rolling portion 28, 29. In this way, by configuring the lateral displacement prevention projection 26, 27 as a laterally long rectangle or a laterally long flat shape, it is possible to suppress the dimension A in the track thickness direction thereof to be small and ensure a prescribed strength. The ground surface side 26a, 27a of each lateral displacement prevention projection 26, 27 is inclined at a gentle angle a (refer to Figure 6 ) from the upper surface side 16a of the wing portion 16 of the core 7 toward the tip end side in a manner in which the tip end is raised.
[0040] The one side lateral displacement prevention projection 26 and the other side lateral displacement prevention projection 27 are disposed projecting in opposite directions from both sides in the track width direction of the intermediate roller rolling portion 30 toward both sides in the track rotation direction. The one side lateral displacement prevention projection 26 of one adjacent core 7 and the other side lateral displacement prevention projection 27 of another core 7 are disposed side by side in the track width direction, and even in the case where the adjacent cores 7 are bent in a mountain fold shape or a valley fold shape with respect to each other, they overlap by a prescribed amount in the track rotation direction in a manner in which the tip end sides do not come apart from each other.
[0041] The contact surfaces 26a and 27a of each lateral offset prevention protrusion 26 and 27 are positioned on the upper surface 16a of the wing portion 16 of the core frame 7, approximately at the midpoint of the distance from the contact surface of the wing portion 16 to the central roller rolling portion 30 in the track thickness direction, forming an inclined surface at an angle α that rises from this midpoint towards the top. It should be noted that while the contact surfaces 26a and 27a of the lateral offset prevention protrusions 26 and 27 are inclined at an angle α, they can also be inclined surfaces parallel to or nearly parallel to the roller rolling portions 28 and 29 of the lateral offset prevention protrusions 26 and 27.
[0042] like Figure 6 , Figure 7 As shown, the lateral offset prevention protrusions 26 and 27 between each core rib 7 are respectively configured to correspond to the side tread block portion 14 and the recess 11 between tread blocks. That is, the pair of lateral offset prevention protrusions 26 and 27 on the side of the side tread block portion 14 are configured to correspond to the wide tread block portion 17 in such a way that their entirety in the track rotation direction corresponds to the inside of the side tread block portion 14, or correspond to the wider portion of the boundary tread block portion 19 between the wide tread block portion 17 and the narrow tread block portion 18.
[0043] A pair of lateral offset prevention protrusions 26, 27 on the side of the recess 11 between the tread blocks are configured to correspond to the narrow recess 20 in such a way that the side tread block portion 14 is located near the direction of track rotation, or to correspond to the narrow portion of the boundary between the narrow recess 20 and the wide recess 21.
[0044] Therefore, as Figure 6 As shown, the top surface 17a of the tread block of the wide tread block 17 of the side tread block 14 extends to the periphery of the lateral offset of the side tread block 14 to prevent protrusions 26 and 27. Furthermore, the wide tread block 17 of the side tread block 14 on both sides becomes a state in which the lateral offset of the tread block inclined surface 17b of the side tread block 14 near the extreme of the track rotation direction is relative to the lateral offset of the recess 11 between the tread blocks to prevent protrusions 26 and 27 from approaching.
[0045] It should be noted that as long as at least one of the pair of lateral offset prevention protrusions 26 and 27 on the side of the side pattern block portion 14 is configured to correspond to the wide pattern block portion 17 and the narrow recess portion 20, the other lateral offset prevention protrusion 27 configured nearby can be configured in the wide pattern block portion 17 and the narrow recess portion 20 even when it is disengaged from the wide pattern block portion 17 and the narrow recess portion 20.
[0046] The guide protrusion 25 integrally comprises a base 25a in the track thickness direction and a rhomboid top 25b on the base 25a. The rhomboid top 25b is formed into a generally rhomboid shape when viewed from above. Each core rib 7 has an acute-angled protrusion on both sides protruding from the base 25a in the track rotation direction. The top surface of each rhomboid top 25b is flat at approximately the same height, and the rhomboid top 25b forms the inner roller rolling path 32 for the rolling of the roller 5.
[0047] It should be noted that the rhomboid tops 25b of each guide protrusion 25 overlap in the track rotation direction to form an uninterrupted inner roller rolling path 32 in the track rotation direction. Furthermore, a predetermined interval is provided so that the rhomboid tops 25b of the guide protrusion 25 will not interfere with each other in the track rotation direction when they are wound on the drive wheel 2, etc.
[0048] Lateral offset prevention protrusions 26 and 27 protrude in opposite directions from the side of the intermediate roller rolling portion 30 on the wing 16 toward both sides of the track rotation direction. The base side of the lateral offset prevention protrusions 26 and 27 is integral with the upper surface side 16a of the wing 16 of the core 7, and is received by the wing 16 from below. Regarding each of the lateral offset prevention protrusions 26 and 27, one side of the lateral offset prevention protrusion 26 is located on the side of the intermediate roller rolling portion 30 near the guide protrusion 25, and the other side of the lateral offset prevention protrusion 27 is located on the side of the intermediate roller rolling portion 30 away from the guide protrusion 25. The lateral offset prevention protrusions 26 and 27 of adjacent core 7 in the track rotation direction are arranged adjacently in the track width direction. There is a sufficient gap between the top of each lateral offset prevention protrusion 26, 27 and the intermediate roller rolling part 30 of the core 7 on the opposite track rotation direction side, so that even if the adjacent core 7 bends, the lateral offset prevention protrusion 26, 27 will not interfere with the intermediate roller rolling part 30 of the core 7.
[0049] The lateral offset prevention surfaces 26b and 27b of the lateral offset prevention protrusions 26 and 27, which also serve as the lateral offset prevention protrusions 28 and 29, are close to each other in the track width direction. An elastic material 12 of the track body 6 is sandwiched between the lateral offset prevention protrusions 26 and 27.
[0050] like Figure 4 , Figure 5 As shown, the engaging part 15, the guide protrusion 25, the intermediate roller rolling part 30, and the roller rolling parts 28 and 29 are embedded in the elastic material 12 of the track body 6. On the opposite side of the contact surface of the track body 6, a coating layer 33 of a predetermined thickness is formed along the concave and convex shape of the core rib 7. It should be noted that the coating layer 33 is formed relatively thin along the concave and convex shape of the core rib 7, but the coating layer 33 can also be omitted, leaving the concave and convex shape of the core rib 7 exposed.
[0051] To make the bending of the track body 6 easy, in the track body 6, on the opposite side of the ground surface between the adjacent core bones 7, an inner side recess 35, an outer side recess 36, and a connecting recess 37 are formed. The inner side recess 35 is disposed on the inner side of the track body 6 near the engagement hole 9, and is formed between the engagement hole 9 and the lateral displacement prevention protrusions 26, 27, avoiding the guide protrusion 25. The outer side recess 36 is formed on the outer side of the track body 6 than the lateral displacement prevention protrusions 26, 27, in the track width direction.
[0052] As shown in Figure 4 The roller 5 integrally has a small-diameter wheel portion 39 disposed on the central side in the track width direction, and a large-diameter wheel portion 40 disposed on the outer side of each small-diameter wheel portion 39, the small-diameter wheel portion 39 rolls on the inner side of the guide protrusion 25 on the roller rolling path 32 in the track rotation direction, and the large-diameter wheel portion 40 rolls on the outer side of the roller rolling path 31 of the lateral displacement prevention protrusions 26, 27, etc. in the track rotation direction.
[0053] The elastic track 4 thus configured has the following advantages. The track body 6 is guided by the roller 5 while being wound around the drive wheel 2 and the driven wheel 3, and advances by the drive of the drive wheel 2, rotating in the backward direction. Also, the drive force is used when the drive lug 10 sinks into the ground and rotates in the track rotation direction.
[0054] In the drive lug 10, in addition to the wide lug portion 17 of the side lug portion 14 corresponding to the two core bones 7, there is also a central lug portion 13 in the track width direction between the engagement holes 9 in the central portion of the track body 6, so the central portion of the track body 6 can also reliably grip the ground, and compared to the past, the surface pressure of the ground surface of the drive lug 10 can be reduced by the side lug portion 14 and the central lug portion 13, and the driving force can be improved.
[0055] Further, the wide lug portion 17 spans two adjacent core bones 7 in the track rotation direction, and is formed integrally with two adjacent central lug portions 13 in the track rotation direction, and the wide lug portion 17 exists on both sides of the central lug portion 13 in the track width direction, so compared to the case where the central lug portion 13 is independent of the wide lug portion 17, the durability of the central lug portion 13 itself is improved, and sufficient driving force can be obtained.
[0056] The lug-to-lug recess 11 between the wide lug portions 17 becomes a narrow-width recess 20 of substantially the same degree or narrower than the two adjacent central lug portions 13 in the track rotation direction on the side near the engagement hole 9, so the width in the track rotation direction of the wide lug portion 17 of the adjacent side lug portion 14 in the track rotation direction can be easily ensured.
[0057] Moreover, in the side block portion 14, on the outside of the wide block portion 17, there is a narrow block portion 18 that is narrower in width than the wide block portion 17, and, further, the outside of the track width direction of the narrow recess portion 20 becomes a wide recess portion 21 that is wider in width than the narrow recess portion 20, and thus, even though there is the wide block portion 17 in the side block portion 14 on the side close to the engagement hole 9, it is possible to improve the dozing performance of the track body 6.
[0058] On the side of the side block portion 14 and the side of the block-to-block recess portion 11, there is a pair of lateral displacement prevention protrusions 26, 27, and by the lateral displacement prevention protrusions 26, 27, lateral displacement of adjacent core bones 7 in the track width direction is prevented, and with respect to each of the lateral displacement prevention protrusions 26, 27, the following effects are obtained.
[0059] That is, since the lateral displacement prevention protrusions 26, 27 on the side of the side block portion 14 correspond to the wide block portion 17 on the side of at least the central block portion 13 of the lateral displacement prevention protrusions 26, 27, it is possible to increase the thickness of the elastic material 12 on the ground surface side 26a, 27a of the lateral displacement prevention protrusions 26, 27, and it is possible to correspondingly absorb vibrations. This effect is further improved by the pair of lateral displacement prevention protrusions 26, 27 on the side of the side block portion 14 corresponding to the wide block portion 17 or corresponding to a wide portion in the boundary portion between the wide block portion 17 and the narrow block portion 18.
[0060] Further, in the pair of lateral displacement prevention protrusions 26, 27 on the side of the block-to-block recess portion 11, the lateral displacement prevention protrusion 26 on the side of at least the central block portion 13 corresponds to the narrow recess portion 20, and on both sides in the track rotation direction of the lateral displacement prevention protrusion 26, there are the side block portions 14 of the drive block 10 in the vicinity of the lateral displacement prevention protrusions 26, 27, and thus, it is possible to arrange the lateral displacement prevention protrusions 26, 27 close to the side block portions 14 on both sides in the track rotation direction.
[0061] Thus, by the side block portions 14 on both sides in the track rotation direction, it is possible to secure the thickness of the elastic material 12 on the ground surface side 26a, 27a of the lateral displacement prevention protrusions 26, 27, and it is possible to absorb vibrations similarly to the case of the lateral displacement prevention protrusions 26, 27 on the side of the side block portion 14. This effect is further improved by the pair of lateral displacement prevention protrusions 26, 27 on the side of the block-to-block recess portion 11 corresponding to the narrow recess portion 20 or corresponding to a narrow portion in the boundary between the narrow recess portion 20 and the wide recess portion 21.
[0062] In the case where the track body 6 rotates, as shown in FIG. 6, the side block portion 14 on the side of the wide block portion 17 is displaced in the track width direction, and the side block portion 14 on the side of the narrow block portion 18 is displaced in the track width direction. Figure 4 , Figure 9 , Figure 10As shown, the small-diameter wheel portions 39 of the rollers 5 rotate on the inner side roller rolling paths 32 on the guide protrusions 25 in the track rotation direction, and the large-diameter wheel portions 40 rotate on the intermediate roller rolling portions 30, the roller rolling portions 28, 29, and the like, outer side roller rolling paths 31 in the track rotation direction, and thus the track body 6 can be guided by the rollers 5 at four positions in the track width direction. Also, since the four roller rolling paths 31, 32 are continuous at substantially the same height in the track rotation direction between the adjacent core bones 7, the up-and-down vibration of the rollers 5 when rotating can be reduced.
[0063] That is, the guide protrusions 25 of each core bone 7 are at the same height, and with respect to the inner side roller rolling paths 32 on the guide protrusions 25, the diamond-shaped top portions 25b overlap in the track rotation direction between the adjacent core bones 7, and thus the small-diameter wheel portions 39 can stably rotate without up-and-down vibration on the inner side roller rolling paths 32 formed by the guide protrusions 25 on the inner side in the track width direction.
[0064] Also, since the intermediate roller rolling portions 30 and the roller rolling portions 28, 29 of the core bones 7 are at substantially the same height, and each roller rolling portion 28, 29 overlaps in the track rotation direction, the large-diameter wheel portions 40 can stably rotate without up-and-down vibration on the two outer side roller rolling paths 31 formed by the intermediate roller rolling portions 30 and the roller rolling portions 28, 29 of each core bone 7 on the outer side in the track width direction.
[0065] The lateral displacement prevention protrusions 26, 27, which function as the roller rolling portions 28, 29, protrude to both sides in the track rotation direction in each core bone 7, and are configured in a laterally long rectangular shape or a laterally long flat shape that is different from the conventional structure, and thus have the following advantages.
[0066] When the track body 6 is bent, each lateral displacement prevention protrusion 26, 27 moves in a bending motion integrally with the elastic material 12 that surrounds the lateral displacement prevention protrusions 26, 27. However, since the dimension B in the track width direction from the lateral displacement prevention surface side 26b, 27b to the opposite side 26c, 27c of the lateral displacement prevention surface is longer than the dimension A from the ground surface side 26a, 27a of the lateral displacement prevention protrusion 26, 27 to the outer side roller rolling path 31, and the dimension A from the ground surface side 26a, 27a to the roller rolling portions 28-30 is thinner than in the past, the lateral displacement prevention protrusions 26, 27 can smoothly bend integrally with the elastic material 12, and the flexibility of the track body 6 can be improved despite the presence of the wide block portion 17 that spans two adjacent core bones 7 on the side portion 14 of the drive block 10.
[0067] Therefore, not only can the cracking of the elastic material 12 of the track body 6 be reduced, but also the wall thickness of the elastic material 12 constituting the side block portion 14 can be increased at the ground surface side 26a, 27a of the lateral displacement prevention protrusion 26, 27, and the effect of absorbing vibration of the elastic material 12 can be improved. Since the wall thickness of the elastic material 12 constituting the side block portion 14 can be increased at the ground surface side 26a, 27a of the lateral displacement prevention protrusion 26, 27, the elastic material 12 can be less compressed between the lateral displacement prevention protrusion 26, 27 and the ground surface, and the elastic material 12 of the side block portion 14 can be easily prevented from being damaged or the like.
[0068] Further, since each lateral displacement prevention protrusion 26, 27 is formed in a laterally long rectangular or laterally long flat shape in which the track width direction dimension B from the lateral displacement prevention surface side 26b, 27b to the opposite side 26c, 27c of the lateral displacement prevention surface is long, the track width direction dimension of the roller rolling portion 28, 29 can be easily ensured compared to the case where the thickness direction dimension of the track body 6 is long. Therefore, the roller width in the track width direction of the large-diameter wheel portion 40 can be increased, or the interval in the track width direction between the large-diameter wheel portions 40 can be increased, and the inclination of the track body 6 in the track width direction can be prevented.
[0069] Between the tip end of each lateral displacement prevention protrusion 26, 27 and the intermediate roller rolling portion 30 of the core 7 on the opposite side of the track rotation direction, there is an interval of the same degree as or more than the track width direction dimension of each lateral displacement prevention protrusion 26, 27, and thus the elastic material 12 can be prevented from being compressed or the like at this portion.
[0070] Figure 11 A second embodiment of the present application is exemplified. In this embodiment, the lateral displacement prevention protrusions 26, 27 on the side block portion 14 side are arranged in the range of the wide block portion 17 in the track width direction, and further, the lateral displacement prevention protrusions 26, 27 on the block-to-block recess 11 side are arranged in the range of the narrow recess 20 in the track width direction.
[0071] Thus, even in the case where the interval in the track width direction between the outer roller rolling paths 31 is narrow, each lateral displacement prevention protrusion 26, 27 can be arranged in the range of the wide block portion 17 and the narrow recess 20.
[0072] Figure 12 A third embodiment of the present application is exemplified. In the case where the drive block 10 of the track body 6 has the central block portion 13 and the side block portion 14, as Figure 12As shown, the side block portion 14 can also be configured so that the narrow block portion 18 is curved toward the side of the track rotation direction of the wide block portion 17. Therefore, the side block portion 14 is not limited to the case where the wide block portion 17 and the narrow block portion 18 are arranged in a straight line in the track width direction as illustrated in the first and second embodiments.
[0073] For example, as shown in the third embodiment, the wide block portion 17 and the narrow block portion 18 can be configured to be curved at the middle of the side block portion 14, or the side block portion 14 can be configured to be inclined with respect to the central block portion 13. Note that the recess 11 between the blocks of the track body 6 is curved in correspondence with the shape of the side block portion 14.
[0074] Note that in the third embodiment, as shown in Figure 12 the lateral displacement prevention protrusions 26, 27 on the side of the side block portion 14 are arranged in correspondence with the wide block portion 17, and the lateral displacement prevention protrusions 26, 27 on the side of the recess 11 between the blocks are arranged in correspondence with the narrow recess 20.
[0075] In this way, the wide block portion 17 can be arranged in correspondence with the lateral displacement prevention protrusions 26, 27 on the side of the side block portion 14, and the narrow recess 20 can be arranged in correspondence with the lateral displacement prevention protrusions 26, 27 on the side of the recess 11 between the blocks. If configured in this way, the elastic material 12 of the ground surface side 26a, 27a can be prevented from being damaged or the like on the side of the side block portion 14, on the side of the recess 11 between the blocks, and the like, and the durability of the track body 6 can be further improved.
[0076] Figure 13 A fourth embodiment of the present application is shown. As shown in Figure 13 (a), (b), the lateral displacement prevention protrusions 26, 27 are preferably rectangular or flat in the track width direction, the size B in the track width direction is larger than the size A in the thickness direction of the track body 6, the roller rolling portions 28, 29 are formed on the opposite side of the ground surface, and the ground surface side 26a, 27a is preferably an inclined surface 26h, 27h with the top end raised. As shown in Figure 13 (b), the angle a of the inclined surface 26h, 27h can be increased with respect to a line segment parallel to the roller rolling portions 28, 29. In addition, the extension line of the inclined surface 26h can pass through the center or the vicinity thereof when the core 7 is inclined in the elastic material 12 when the track body 6 is curved.
[0077] Figure 14The fifth embodiment of the application is shown in the example. The core 7 is generally manufactured by forging or casting, but when manufactured by forging, the lateral displacement prevention protrusions 26, 27 are preferably configured in a trapezoidal shape or the like, with draft angles of a mold attached to each portion of the core 7. However, in cases where the mold is removed or the like, the draft angles can be omitted.
[0078] For example, in the lateral displacement prevention protrusions 26 that are rectangular in shape or flat in shape in the lateral direction, as shown in Figure 14 (a), each pair of opposing surfaces of the upper side 26d, the lower side 26e, the left side 26f, and the right side 26g can be made substantially parallel to the track width direction and the track thickness direction, and the four corners between the pair of opposing surfaces can be configured in a circular arc shape.
[0079] Further, as shown in Figure 14 (b), in the lateral displacement prevention protrusions 26, the upper side 26d, which becomes the roller rolling portion 28, and the right side 26g, which becomes the lateral displacement prevention surface side 26b, among the upper side 26d, the lower side 26e, the left side 26f, and the right side 26g, can be made flat or nearly flat, and the other left side 26f and the lower side 26e can be configured in a circular arc shape or another curved shape.
[0080] The above describes each embodiment of the application in detail, but the application is not limited to the embodiments, and various modifications can be made. For example, in the embodiments, the drive lugs 10 that constitute the left and right rows of lug rows are provided on the outer periphery of the track body 6 on the ground surface side, but the shape, configuration, and arrangement of the drive lugs 10 can be arbitrarily modified.
[0081] In the first embodiment, the roller 5 having the small-diameter wheel portion 39 and the large-diameter wheel portion 40 is employed, but the roller 5 can have large-diameter wheel portions 40 on the left and right. Further, left and right rollers 5 can be separately provided. The lateral displacement prevention protrusions 26, 27 can be rectangular in shape or flat in shape in the lateral direction, as long as the dimension B is longer than the dimension A, and various cross-sectional shapes can be selected within the concept of the lateral longer shape.
[0082] The lateral displacement prevention protrusions 26, 27 corresponding to the side block portions 14 are preferably arranged in the range of the wide block portions 17, and the lateral displacement prevention protrusions 26, 27 corresponding to the block- interval recesses 11 are arranged in the range of the narrow recesses 20. However, in the case where the track width direction interval between the outer roller rolling paths 31 is wide, the lateral displacement prevention protrusions 26, 27 corresponding to the side block portions 14 can be arranged in the wide block portions 17 and the narrow recesses 20, at the boundary portion between the wide block portions 17 and the narrow block portions 20, at the wide portion on the side close to the wide block portions 17, and the lateral displacement prevention protrusions 26, 27 corresponding to the block- interval recesses 11 can be arranged in the narrow recesses 20 and the wide recesses 21, at the boundary portion between the narrow recesses 20 and the wide recesses 21, at the narrow portion on the side close to the narrow recesses 20.
[0083] [Legend of Reference Numerals]
[0084] 4 elastic track 5 roller 6 track body 7 core 9 engagement hole 10 drive block
[0085] 11 block-interval recess 12 elastic material 13 central block portion 14 side block portion
[0086] 15 engagement portion 16 wing portion 17 wide block portion 17a block top surface 17b block inclined surface
[0087] 18 narrow block portion 19 boundary block portion 20 narrow recess 21 wide recess 25 guide protrusion 26 one-side lateral displacement prevention protrusion 27 other-side lateral displacement prevention protrusion 28, 29 roller rolling portion 30 middle roller rolling portion 31 outer roller rolling path 32 inner roller rolling path
Claims
1. An elastic track comprising a track body primarily made of an elastic material and core members embedded in the track body at approximately equal intervals in the track rotation direction, the core members comprising: engaging portions disposed between engaging holes in the track body; guide protrusions disposed on both sides of the engaging portions in the track width direction; a lateral offset prevention protrusion on one side, protruding outward from the outer side of the guide protrusions in the track width direction toward one side of the track rotation direction; and a lateral offset prevention protrusion on the other side, protruding outward from the outer side of the guide protrusions in the track width direction toward the other side of the track rotation direction, and being disposed in relation to the engaging portions. Between the lateral offset prevention protrusions on adjacent core sides, the core is prevented from shifting laterally in the track width direction. The opposite sides of the contact surfaces of the lateral offset prevention protrusions on one side and the lateral offset prevention protrusions on the other side are used as roller rolling portions. The elastic track is characterized in that an intermediate roller rolling portion is provided on the core between the lateral offset prevention protrusions on one side and the lateral offset prevention protrusions on the other side. Each lateral offset prevention protrusion is laterally longer in the track width direction from the lateral offset prevention surface side to the opposite side of the lateral offset prevention surface side than in the dimension from the contact surface side to the roller rolling portion.
2. The elastic track according to claim 1, characterized in that, Regarding the roller rolling portion that prevents lateral offset protrusion on one side and the roller rolling portion that prevents lateral offset protrusion on the other side, their top ends overlap in the track rotation direction.
3. The elastic track according to claim 1, characterized in that, Between the lateral offset prevention protrusion on one side and the lateral offset prevention protrusion on the other side, an intermediate roller rolling part is provided in a convex shape on the core wing. The base side of each lateral offset prevention protrusion is integral with the upper surface of the wing and the side of the intermediate roller rolling part. The contact surface side of each lateral offset prevention protrusion is an inclined surface with the top end raised.
Citation Information
Patent Citations
Elastic Crawler
JP2022028048A