Elastic crawler with core

Abstract

To provide an elastic crawler with a core metal enabling vertical movement of a roller to be suppressed to reduce vibration by increasing torsional rigidity of a guide protrusion with respect to a core metal blade part.SOLUTION: In an elastic crawler 10 with core metals having a configuration in which rollers 5 arranged along a ground roll on a top surface 22f of a guide protrusion 22, roller disengagement preventing protrusions 23A, 23B; 24A, 24B respectively protrude in opposite directions of a crawler circumferential direction from a pair of guide protrusion bases 21b, 21b of a core metal main body 21; the roller disengagement preventing protrusions 23A, 24A; 23B, 24B protruding in the crawler circumferential direction to protrude to each other toward opposed core metal main bodies 21 of adjacent core metals 20 mesh each other in a crawler width direction; and ribs 25, 25 are formed that connect the roller disengagement preventing protrusions 24A, 24B on the side of a core metal blade part among the roller disengagement preventing protrusions 23A, 24A; 23B, 24B meshing each other in the crawler width direction and the core metal blade parts 21c, 21c.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to an elastic crawler with cores, in which a plurality of cores are embedded in an endless elastic band in the circumferential direction of the crawler. [Background technology]

[0002] The core body of the core, which is long in the crawler width direction, consists of a central portion, a pair of guide protrusion bases at both ends of the central portion, each having a pair of guide protrusions that protrude toward the inner circumference of the crawler, and a pair of core blade portions extending on both sides from the pair of guide protrusion bases. Elastic crawlers with cores are known in which rollers arranged along the ground roll on the top surfaces of guide protrusions. Among these, there are examples (e.g., Patent Document 1) in which anti-wheel derailment protrusions protrude from the core body in the circumferential direction of the crawler to prevent wheels from derailing due to lateral shifting between adjacent cores in the crawler width direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-212741

[0004] The elastic crawler with a core wire, in which the rollers of Patent Document 1 roll on the top surface of the guide protrusions, has a pair of guide protrusions protruding toward the inner circumference of the crawler from the core wire body, which is long in the width direction of the crawler, and a pair of anti-detachment protrusions (anti-wheel slippage protrusions) protruding in the circumferential direction of the crawler from the protrusion base of the pair of guide protrusions.

[0005] A pair of anti-detachment protrusions that protrude toward the opposing core bodies of adjacent cores overlap each other in the crawler width direction, thereby preventing lateral displacement between adjacent cores in the crawler width direction. In addition, a pair of anti-detachment protrusions that protrude toward each other's opposing core bodies overlap each other in the thickness direction of the crawler, and the overlapping anti-detachment protrusions suppress oscillation in the thickness direction of the crawler, so that oscillation (rotation) of the guide protrusions in the circumferential direction of the crawler is suppressed between adjacent cores. Summary of the Invention [Problem to be solved by the invention]

[0006] In an elastic crawler with a core wire, in which rollers arranged along the ground surface roll on the top surface of a guide protrusion, the rollers roll on the top surface of the guide protrusion of the core wire from the downstream end to the center and then to the upstream end in the direction of crawler rotation of the guide protrusion.

[0007] When the roller is at the downstream end, a pressing force is applied to the downstream end of the guide protrusion, causing the guide protrusion to twist and rotate relative to the core blade portion of the core, which is kept approximately parallel to the ground by pressing the elastic crawler against the ground, and the downstream end of the guide protrusion is pushed down. When the roller is at the center of the guide protrusion, a pressing force is applied to the center of the guide protrusion, so the guide protrusion does not twist or rotate and is not pushed down. When the roller passes the center of the guide protrusion and reaches the upstream end, a pressing force is applied to the upstream end of the guide protrusion, causing the guide protrusion to twist and rotate relative to the core blade portion, and the upstream end of the guide protrusion is pressed down.

[0008] Therefore, as the roller rolls on the top surface of the guide protrusion of the core wire, the downstream end of the guide protrusion presses down on the downstream end, and the upstream end presses down on the upstream end, causing the top of the guide protrusion to oscillate around the crawler, and the roller itself to move up and down. The up and down movement of the rollers causes vibration.

[0009] In the cored elastic crawler of Patent Document 1, the anti-detachment protrusions that protrude toward the opposing core bodies partially overlap each other in the thickness direction of the crawler, and the tops of the guide protrusions between adjacent cores are prevented from swinging in the circumferential direction of the crawler.

[0010] However, when the roller transfers from one guide protrusion to the adjacent guide protrusion, it sometimes rides on both the upstream and downstream ends of each of the guide protrusions, and at this time both the upstream and downstream ends are pushed down at the same time.Even if the anti-detachment protrusions that protrude toward the opposing core bodies overlap partially in the thickness direction of the crawler, both overlapping portions of the overlapping anti-detachment protrusions will be pushed down, and it will not be possible to suppress the swinging of the tops of the guide protrusions in the circumferential direction of the crawler. Therefore, the up and down movement of the rollers is not suppressed, causing vibrations. This causes the aircraft itself to experience increased vibrations while running.

[0011] In addition, there are cases where part of one anti-slip protrusion overlaps part of the other anti-slip protrusion in the thickness direction of the crawler, sandwiching it between them, but it is difficult to set the clearance between the overlapping parts, and it is difficult to design it in a way that does not affect the bending deformation of the crawler within the normal range of use.

[0012] The present invention has been developed in consideration of these points, and its purpose is to provide a cored elastic crawler that can suppress the up and down movement of the rollers and reduce vibration by increasing the torsional rigidity of the guide protrusions with respect to the core blade portion. [Means for solving the problem]

[0013] In order to achieve the above object, the present invention provides: A cored elastic crawler in which a plurality of cores are embedded at regular intervals in the circumferential direction of the crawler in an endless band-shaped elastic body made of an elastic material formed in an endless band shape, a core body of the core that is long in the crawler width direction and includes a central engagement portion with which a drive sprocket engages, a pair of guide projection bases formed on both ends of the central engagement portion, and a pair of core blade portions extending laterally opposite each other from the pair of guide projection bases; A pair of guide protrusions protrude from the pair of guide protrusion base portions toward the inner periphery of the crawler, the core metal is embedded in the endless belt-shaped elastic body, excluding at least the guide projection; In a cored elastic crawler having a configuration in which rollers arranged along the ground roll on the top surfaces of the guide projections, Wheel derailment prevention protrusions protrude in both directions in the crawler circumferential direction from the pair of guide protrusion bases of the core metal body, By projecting in the crawler circumferential direction, the wheel derailment prevention projections projecting toward the opposing core bodies of the adjacent cores overlap each other in the crawler width direction, The present invention is characterized in that a rib is formed to connect the wheel derailment prevention protrusion on the core metal blade portion side to the wheel derailment prevention protrusions that overlap each other in the crawler width direction and the core metal blade portion.

[0014] With this configuration, the rib connects the anti-wheel derailment protrusion that protrudes circumferentially from the guide protrusion base of the core wire body in the crawler circumferential direction to the core wire blade portion, so that the torsional rigidity of the guide protrusion formed at the guide protrusion base relative to the core wire blade portion is structurally increased, and the rib increases the area of ​​the anti-wheel derailment protrusion embedded in the elastic body when viewed from the crawler thickness direction, further suppressing the rotation of the anti-wheel derailment protrusion and guide protrusion by the elastic body.As a result, even if the roller rolls on the top surface of the guide protrusion, torsional rotation of the guide protrusion is suppressed relative to the core wire blade portion of the core wire, which is kept approximately parallel to the ground by pressing the elastic crawler against the ground, and therefore the up and down movement of the roller is reduced, making it less likely to generate vibration and preventing the vehicle's running vibration from worsening.

[0015] In a preferred embodiment of the present invention, The outer circumferential surface of the rib is located at the same position as the outer circumferential surface of the core blade portion, or is located closer to the inner circumferential side of the crawler than the outer circumferential surface of the crawler.

[0016] With this configuration, the outer peripheral side surface of the rib is located at the same position as the outer peripheral side surface of the crawler of the core blade portion, or closer to the inner peripheral side of the crawler than the outer peripheral side surface of the crawler, so the rib is closer to the top of the guide protrusion, the center of rotation of the guide protrusion relative to the core blade portion is on the inner peripheral side of the crawler, and the torsional rigidity of the guide protrusion relative to the core blade portion is increased, so that the rotation of the guide protrusion is suppressed, the up and down movement of the roller becomes even smaller, and vibration is less likely to occur.

[0017] In a preferred embodiment of the present invention, The rib protrudes toward the inner periphery of the crawler.

[0018] With this configuration, the rib protrudes toward the inner circumference of the crawler, so the center of rotation of the guide protrusion relative to the core blade portion is on the inner circumference of the crawler, and the torsional rigidity of the guide protrusion relative to the core blade portion is increased, thereby suppressing the rotation of the guide protrusion and further reducing the up and down movement of the roller, making it less likely to cause vibration.

[0019] In a preferred embodiment of the present invention, The rib overlaps in the crawler thickness direction with a steel cord layer embedded in the core metal blade portion of the endless belt-shaped elastic body on the outer circumferential side of the crawler.

[0020] The ribs overlap in the crawler thickness direction with the steel cord layer embedded in the core metal blade portion of the endless belt-like elastic body on the outer circumferential side of the crawler, so that the ribs are supported by the steel cord layer together with the core metal blade portion via the elastic material. This rib connects the core blade portion and the anti-slip protrusion, so that the guide protrusion is supported by the steel cord layer via the rib, the anti-slip protrusion, and further the guide protrusion base, thereby further suppressing rotation of the guide protrusion. This further reduces the vertical movement of the rollers, making it more difficult for vibrations to occur.

[0021] In a preferred embodiment of the present invention, The pair of wheel derailment prevention projections that respectively project from the pair of guide projection base portions in the circumferential direction of one of the crawlers have different projection lengths.

[0022] According to this configuration, a pair of anti-wheel derailment protrusions that each protrude from a pair of guide protrusion bases in the circumferential direction of one of the crawlers have different protrusion lengths, so the protrusion length of one of the pair of anti-wheel derailment protrusions can be made longer than if the protrusions have the same protrusion lengths, which increases the resistance to rotation of the guide protrusions and suppresses the rotation of the guide protrusions, further reducing the up and down movement of the rollers and making it less likely to cause vibration.

[0023] In a preferred embodiment of the present invention, The difference in the protruding lengths of the pair of anti-wheel-falling projections is 15% or less of the embedding pitch of the core metal.

[0024] If there is a large difference in the protruding lengths of a pair of anti-wheel derailment protrusions, the resistance of the pair of anti-wheel derailment protrusions to the rotation of the pair of guide protrusions will be significantly different, causing the central engagement portion between the pair of guide protrusions to twist, which may cause the pair of guide protrusions to rotate in opposite directions to each other, resulting in up and down movement of the roller. According to this configuration, by making the difference in the protruding length of a pair of anti-wheel derailment protrusions 15% or less of the embedding pitch of the core wire, the resistance to rotation of the guide protrusion provided by the anti-wheel derailment protrusion with the longer protruding length is increased compared to those with the same protruding length, while minimizing the rotation of the pair of guide protrusions in opposite directions, thereby reducing the up and down movement of the roller. [Effects of the Invention]

[0025] In the present invention, a rib connects the anti-wheel derailment protrusion that protrudes circumferentially from the guide protrusion base of the core wire body in the crawler circumferential direction to the core wire blade portion, thereby structurally increasing the torsional rigidity of the guide protrusion formed at the guide protrusion base relative to the core wire blade portion, and the rib increases the area of ​​the anti-wheel derailment protrusion embedded in the elastic body when viewed from the crawler thickness direction, thereby further suppressing the rotation of the anti-wheel derailment protrusion and guide protrusion by the elastic body.As a result, even when the roller rolls on the top surface of the guide protrusion, torsional rotation of the guide protrusion is suppressed relative to the core wire blade portion of the core wire, which is kept approximately parallel to the ground by pressing the elastic crawler against the ground, thereby reducing the up and down movement of the roller, making it less likely to generate vibration and preventing the vehicle's running vibration from worsening. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a schematic side view of a crawler traveling device using a cored elastic crawler according to an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic perspective view showing a cored elastic crawler, partially in cross section. [Figure 3] FIG. [Figure 4] FIG. 10 is a view of the core wire as seen from the inner periphery side of the crawler. [Figure 5] FIG. [Figure 6] This is a view of the concentric metal from the outer periphery of the crawler. [Figure 7] FIG. [Figure 8] FIG. 3 is a partial view of the cored elastic crawler seen from the inner periphery side of the crawler. [Figure 9] 9 is a diagram showing a cross section of the cored elastic crawler and rollers shown in the IX-IX arrow view of FIG. 8. [Figure 10] 10 is a cross-sectional view of the cored elastic crawler and rollers shown in the direction of arrow XX in FIGS. 8 and 9. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0027] An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic side view of a crawler traveling device 1 using a cored elastic crawler 10 according to one embodiment of the present invention, and FIG. 2 is a schematic perspective view showing the cored elastic crawler 10 in partial cross section. The crawler traveling device 1 is mainly mounted on a construction vehicle such as a mini excavator or a bulldozer and used as a traveling device. In FIG. 2, arrows indicate the circumferential direction, width direction, and thickness direction of the part of the cored elastic crawler 10 that comes into contact with the ground.

[0028] This crawler traveling device 1 is attached to a vehicle (not shown) with a drive sprocket 2 and a driven sprocket 3 arranged at both the front and rear ends, and an elastic crawler 10 with a core wire, which is configured in an endless belt shape, is wound around the drive sprocket 2 and the driven sprocket 3. The crawler traveling device 1 can travel by rotating the driving sprocket 2 so that the cored elastic crawler 10 rotates between the driving sprocket 2 and the driven sprocket 3.

[0029] A plurality of rollers 5 are arranged in the front and rear of the cored elastic crawler 10 at the portion that is in contact with the ground and that is stretched between the driving sprocket 2 and the driven sprocket 3. The rollers 5 are attached to the frame 7 of the vehicle and press down on the elastic crawlers 10 with core metal that come into contact with the ground. A pair of such crawler traveling devices 1 are attached to the left and right sides of the vehicle in the vehicle width direction, and can be driven independently of each other.

[0030] The cored elastic crawler 10 has a plurality of cores 20 embedded at regular intervals around the crawler (the direction of rotation of the cored elastic crawler 10) in an endless band-shaped rubber body 11 made of rubber, an elastic material formed in an endless band shape. On the outer surface of the endless band-shaped rubber body 11 that comes into contact with the ground, multiple lugs 12 are formed to protrude at regular intervals around the crawler, and on the inner surface of the endless band-shaped rubber body 11, portions of the core wires 20 (such as guide protrusions described below) embedded in multiple pieces at regular intervals around the crawler are exposed.

[0031] Figure 2 is an oblique view showing a partial cross section of this cored elastic crawler. Referring to Figure 2, each lug 12 protrudes in a roughly trapezoidal shape, extending diagonally from the center to both sides in the crawler width direction on the outer surface of the crawler body 11, and is arranged in multiple rows around the crawler circumferential direction.

[0032] The core metal 20 embedded in the endless band-shaped rubber body 11 has the shape shown in FIGS. The core body 21, which is a rectangular plate that is long in the crawler width direction of the core 20, consists of a central engagement portion 21a with which the drive sprocket 2 engages, a pair of guide protrusion bases 21b, 21b formed on both ends of the central engagement portion 21a, and a pair of core blade portions 21c, 21c extending laterally on opposite sides from the pair of guide protrusion bases 21b, 21b.

[0033] A pair of guide projections 22, 22 protrude from the pair of guide projection bases 21b, 21b toward the inner periphery of the crawler in the thickness direction of the crawler. The guide projection 22 is a rectangular column whose width in the crawler circumferential direction is longer than its width in the crawler width direction, and 22f is almost flat but slightly recessed in the center in the crawler circumferential direction.

[0034] A pair of such guide projections 22 are formed facing each other in the crawler width direction. Between the pair of guide projections 22, 22, there is a central engagement portion 21a. 3 and 4, the pair of guide projections 22, 22 are slightly offset from each other in the crawler circumferential direction.

[0035] A pair of core metal blade portions 21c, 21c extending laterally on opposite sides from a pair of guide protrusion base portions 21b, 21b have crawler outer side surfaces 21cd, 21cd that are approximately flat, and crawler inner side surfaces 21cu, 21cu have outer ends that form protrusion portions 21ce, 21ce, and the circumferential central portion of the crawler gradually rises from the outer end protrusion portions 21ce, 21ce toward the guide protrusions 22, 22. The central engagement portion 21a has a crawler inner peripheral side surface 21au that forms the bottom surface of a recess formed between a pair of guide protrusions 22, 22, and a crawler outer peripheral side surface 21ad that bulges outward from the substantially flat crawler outer peripheral side surfaces 21cd, 21cd of the core metal blade portions 21c, 21c on both sides.

[0036] A pair of anti-wheel derailment protrusions 23A, 23B protrude in one direction around the crawler circumferential direction from a pair of guide protrusion bases 21b, 21b of the core metal body 21, and a pair of anti-wheel derailment protrusions 24A, 24B protrude in the other direction around the crawler circumferential direction. As shown in FIG. 5, the pair of wheel-off prevention projections 24A, 24B protrude with an appropriate vertical width at the same height as the substantially flat crawler outer peripheral side surfaces 21cd, 21cd of the core metal blade portions 21c, 21c on both sides. The same applies to the pair of wheel-off prevention protrusions 23A and 23B. The wheel derailment prevention projections 23A, 23B, 24A, and 24B protrude tapered when viewed in the crawler thickness direction.

[0037] Wheel derailment prevention protrusion 23A and wheel derailment prevention protrusion 24A protrude in opposite directions from one guide protrusion base 21b, and wheel derailment prevention protrusion 23B and wheel derailment prevention protrusion 24A protrude in opposite directions from the other guide protrusion base 21b.

[0038] Referring to Figure 4, a pair of wheel derailment prevention protrusions 23A, 23B protruding in one direction around the crawler have different protrusion lengths, with wheel derailment prevention protrusion 23B being longer than wheel derailment prevention protrusion 23A by a protrusion length difference D1. Similarly, a pair of wheel derailment prevention projections 24A, 24B projecting in the other circumferential direction of the crawler have different projection lengths, with wheel derailment prevention projection 24A being longer than wheel derailment prevention projection 24B by projection length difference D2.

[0039] In addition, the width W1 between the protruding ends of a pair of anti-wheel derailment protrusions 23A, 23B protruding in one direction around the crawler is narrower than the width W2 between the protruding ends of a pair of anti-wheel derailment protrusions 24A, 24B protruding in the other direction around the crawler.

[0040] A pair of wheel-off prevention projections 24A, 24B having a wide width W2 between their projecting ends are connected to the core metal blade portions 21c, 21c extending laterally therefrom by ribs 25, 25, respectively. Referring to FIG. 5, crawler outer peripheral side surfaces 25d, 25d of the ribs 25, 25 are located closer to the crawler inner peripheral side than the crawler outer peripheral side surfaces 21cd, 21cd of the core metal blade portions 21c, 21c. The crawler outer peripheral side surfaces 25d, 25d of the ribs 25, 25 may be the same as the crawler outer peripheral side surfaces 21cd, 21cd of the core metal blade portions 21c, 21c.

[0041] When viewed from the crawler thickness direction, the ribs 25, 25 are formed in a triangular shape at the corners formed by the wheel derailment prevention projections 24A, 24B and the core metal blade portions 21c, 21c so as to enlarge the area of ​​the wheel derailment prevention projections 24A, 24B. The ribs 25, 25 when viewed in the thickness direction of the crawler are not limited to a triangular shape, but may be formed into a rectangular or quadrant shape, for example.

[0042] Additionally, the crawler inner peripheral side surfaces 25u, 25u of the ribs 25, 25 on the crawler inner peripheral side gradually rise from the side edges toward the guide projections 22, 22.

[0043] A plurality of core metals 20 as described above are embedded in the endless band-shaped rubber body 11 at regular intervals in the circumferential direction of the crawler. FIG. 8 is a partial view of the cored elastic crawler 10 as viewed from the inner periphery of the crawler, showing two adjacent cores 20, 20, and the endless band-shaped rubber body 11 with a scattered dot pattern.

[0044] The core metal 20 is embedded in the endless band-shaped rubber body 11 at an embedding pitch P. The anti-wheel slippage protrusions 23A, 23B, which have a width W1 between a pair of protruding ends protruding from the core body 21 of one core 20 in one direction in the crawler circumferential direction, are arranged so as to sandwich the anti-wheel slippage protrusions 24A, 24B, which have a width W2 (>W1) between a pair of protruding ends protruding from the core body 21 of the adjacent core 20 in the other direction in the crawler circumferential direction, from the outside in the crawler width direction. Therefore, the wheel derailment prevention protrusions 23A and 24A, and the wheel derailment prevention protrusions 23B and 24B, which protrude toward the opposing core bodies 21 of adjacent cores 20, overlap each other in the crawler width direction. Therefore, lateral displacement between adjacent core metals 20, 20 in the crawler width direction is suppressed.

[0045] The protrusion length difference D1 of a pair of anti-wheel derailment protrusions 23A, 23B protruding in one direction in the circumferential direction of the crawler from the guide protrusion bases 21b, 21b of the core wire body 21 and the protrusion length difference D2 of a pair of anti-wheel derailment protrusions 24A, 24B protruding in the other direction in the circumferential direction of the crawler are 15% or less of the embedding pitch P of the core wire 20.

[0046] The core metal 20 is embedded in the endless band-shaped rubber body 11 except for the pair of guide projections 22, 22 and the crawler inner peripheral side surface 21au of the central engagement portion 21a. That is, the core body 21 , the anti-wheel slippage projections 23 A, 23 B, 24 A, 24 B, and the ribs 25 , 25 are buried in the endless band-shaped rubber body 11 except for the upper part of the central engagement portion 21 a. Since the anti-wheel slippage projections 23A, 23B, 24A, 24B and the ribs 25, 25 are embedded in the endless band-shaped rubber body 11, the rotation of the guide projection 22 is restrained to some extent by the endless band-shaped rubber body 11 via the guide projection base 21b.

[0047] Further, a steel cord layer 30 having a plurality of steel cords 30s arranged in the circumferential direction of the crawler is disposed along the crawler outer peripheral side surfaces 21cd, 21cd of both core blade portions 21c, 21c on both sides of the core body 21, near the crawler outer peripheral side surfaces 21cd, 21cd, and is embedded in the endless band-shaped rubber body 11 (see Figures 8, 9 and 10). As shown in Figure 8, the steel cord layer 30 is arranged on the outer periphery of the core metal blade portion 21c of the crawler, over almost the entire length of the core metal blade portion 21c in the crawler width direction, and therefore the ribs 25 connecting the anti-run-off protrusions 24A, 24B and the core metal blade portions 21c, 21c overlap with the steel cord layer 30 in the crawler thickness direction.

[0048] The cored elastic crawler 10 is configured such that a roller 5 attached to the frame 7 of the vehicle rolls on the top surfaces 22f, 22f of a pair of guide protrusions 22, 22 that protrude from the endless band-shaped rubber body 11 toward the inner circumference of the crawler. 2, 9 and 10, the roller 5 has an integral structure in which a pair of flanged wheels 5p, 5p of the same shape are coaxially connected by a connecting wheel 5q. The flanged ring 5p has flanges 5pf, 5pf at both ends. As shown in FIG. 9, the pair of flanged wheels 5p, 5p roll on the top surfaces 22f, 22f of the pair of guide projections 22, 22, respectively.

[0049] Referring to Figure 10, when the crawler rotation direction is set to the direction indicated by the arrow, the roller 5 rolls on the top surface 22f of the guide protrusion 22 of the core wire 20 in the crawler rotation direction of the guide protrusion 22 from the downstream end 22d through the center to the upstream end 22u. When the roller 5 is at the downstream end 22d, a pressing force is applied to the downstream end 22d of the guide protrusion 22, which tries to push down the downstream end 22d, and when the roller 5 passes through the center of the guide protrusion 22 and reaches the upstream end 22u, a pressing force is applied to the upstream end 22u of the guide protrusion 22, which tries to push down the upstream end 22u, and a force is applied that swings the top 22t of the guide protrusion 22 in the circumferential direction of the crawler.

[0050] In contrast, the core blade portion 21c of the core 20 presses the endless band-like rubber body 11 with the steel cord layer 30 of the cored elastic crawler 10 embedded therein against the ground, so that it is maintained substantially parallel to the ground. Therefore, a force acts on the guide projection 22 to rotate it in a twisting manner relative to the core blade portion 21c. The twisting rotation of the guide projection 22 relative to the core blade portion 21c causes the roller 5 to move up and down, resulting in vibration.

[0051] In the cored elastic crawler 10 of this embodiment, the ribs 25 connect the wheel derailment prevention projections 24A, 24B that protrude in the crawler circumferential direction from the guide projection bases 21b, 21b of the core body 21 to the core blade portions 21c, 21c. This structurally increases the torsional rigidity of the guide projections 22, 22 formed on the guide projection bases 21b, 21b relative to the core blade portions 21c, 21c. In addition, the ribs 25, 25 increase the area of ​​the wheel derailment prevention projections 24A, 24B embedded in the endless band-shaped rubber body 11 when viewed from the crawler thickness direction. Because the rotation of the anti-wheel slippage protrusions 24A, 24B and the guide protrusions 22, 22 is more suppressed by the endless strip-shaped rubber body 11, even when the roller 5 rolls on the top surfaces 22f, 22f of the guide protrusions 22, 22, torsional rotation of the guide protrusions 22, 22 is suppressed relative to the core wing portions 21c, 21c of the core 20, which are kept approximately parallel to the ground by pressing the endless strip-shaped rubber body 11 against the ground together with the steel cord layer 30, thereby reducing the up and down movement of the roller 5, making it less likely to generate vibration and preventing the vehicle's running vibration from worsening.

[0052] As shown in Figures 5 and 7, the crawler outer peripheral side surface 25d of the rib 25 is located closer to the crawler inner circumference than the crawler outer peripheral side surface 21cd of the core blade portion 21c, so that the rib 25 is closer to the top 22t of the guide protrusion 22 and the center of rotation of the guide protrusion 22 relative to the core blade portion 21c is on the crawler inner circumference side, thereby increasing the torsional rigidity of the guide protrusion relative to the core blade portion, thereby suppressing the rotation of the guide protrusion 22 and further reducing the up and down movement of the roller 5, making it less likely to generate vibration. The crawler outer peripheral side surface 25d of the rib 25 may be the same as the crawler outer peripheral side surface 21cd of the core metal blade portion 21c.

[0053] As shown in Figure 5, the rib 25 has an inner crawler side surface 25u that protrudes toward the inner crawler circumference, so that the center of rotation of the guide protrusion 22 relative to the core blade portion 21c is on the inner crawler circumference side, thereby increasing the torsional rigidity of the guide protrusion 22 relative to the core blade portion 21c, thereby suppressing the rotation of the guide protrusion 22 and further reducing the up and down movement of the roller 5, making it less likely to cause vibration.

[0054] As shown in Figure 8, the ribs 25 overlap in the crawler thickness direction with the steel cord layer 30 embedded in the outer periphery of the core metal blade portion 21c of the endless belt-shaped rubber body 11, so that the ribs 25, together with the core metal blade portion 21c, are supported by the steel cord layer 30 via the rubber, which is an elastic material. This rib 25 connects the core blade portion 21c and the anti-wheel-slip protrusions 24A, 24B, so that the guide protrusion 22 is supported by the steel cord layer 30 via the rib 25, the anti-wheel-slip protrusions 24A, 24B, and further via the guide protrusion base portion 21b, thereby further suppressing rotation of the guide protrusion 22. Therefore, the vertical movement of the roller 5 can be further reduced, making it more difficult for vibration to occur.

[0055] Referring to Figure 8, a pair of wheel derailment prevention protrusions 23A, 23B (24A, 24B) that respectively protrude in the circumferential direction of one of the crawlers from a pair of guide protrusion bases 21b, 21b have different protrusion lengths, so that the protrusion length of one of the wheel derailment prevention protrusions 23B (24A) of the pair of wheel derailment prevention protrusions 23A, 23B (24A, 24B) can be made longer than when the protrusion lengths are the same, which increases the resistance to the rotation of the guide protrusion 22 and suppresses the rotation of the guide protrusion 22, further reducing the up and down movement of the roller 5 and making it less likely to generate vibration.

[0056] If there is a large difference in the protrusion lengths of the pair of anti-wheel derailment protrusions 23A, 23B (24A, 24B), the resistance of the pair of anti-wheel derailment protrusions 23A, 23B (24A, 24B) to the rotation of the pair of guide protrusions 22 will differ greatly, and as a result, the central engagement portion 21c between the pair of guide protrusions 23A, 23B (24A, 24B) will twist, causing the pair of guide protrusions 23A, 23B (24A, 24B) to rotate in opposite directions, which may cause the roller 5 to move up and down. Referring to Figure 8, in this embodiment, the difference D1, D2 in the protrusion length between the pair of anti-wheel derailment protrusions 23A, 23B (24A, 24B) is set to 15% or less of the embedding pitch P of the core wire 20, thereby increasing the resistance to the rotation of the guide protrusions by the anti-wheel derailment protrusion 23B (24A) with the longer protrusion length compared to those with the same protrusion length, while minimizing the rotation of the pair of guide protrusions 22, 22 in opposite directions to each other, thereby reducing the up and down movement of the roller 5 and making it less likely to generate vibration.

[0057] The above describes an elastic crawler with a core wire according to one embodiment of the present invention, but the aspects of the present invention are not limited to the above embodiment and include various aspects that can be implemented within the scope of the gist of the present invention.

[0058] In this embodiment, the crawler traveling device 1 has a cored elastic crawler 10 wound around a drive sprocket 2 and one driven sprocket 3, but this can vary depending on the configuration of the crawler traveling device, and it is also possible to have a cored elastic crawler wound around a drive sprocket and multiple driven sprockets.

[0059] The SDGs have been proposed with the aim of realizing a sustainable society. One embodiment of the present invention is thought to be a technology that can contribute to the long-term use of elastic crawlers by suppressing vibrations in the crawler running device, thereby reducing damage to the elastic crawlers and the machine body and increasing durability. [Explanation of symbols]

[0060] 1...crawler running device, 2...driving sprocket, 2c...rotating shaft, 2p...pin, 3...driven sprocket, 5...roller, 7...frame, 10... elastic crawler with core metal, 11... endless band-shaped rubber body, 12... lug, 20...Core metal, 21...Core metal body, 21a...Central engagement portion, 21b...Guide protrusion base portion, 21c...Core metal blade portion, 22...Guide protrusion, 22t...Top portion, 22f...Top surface, 23A, 23B, 24A, 24B...Ring derailment prevention protrusions, 30...Steel cord layer. 30s...Steel cord.

Claims

1. A cored elastic crawler (10) in which a plurality of cores (20) are embedded at regular intervals in the circumferential direction of the crawler in an endless band-shaped elastic body (11) made of an elastic material formed in an endless band shape, The core metal body (21) of the core metal (20) is long in the crawler width direction and comprises a central engagement portion (21a) with which the drive sprocket (2) engages, a pair of guide protrusion base portions (21b) formed at both ends of the central engagement portion (21a), and a pair of core metal blade portions (21c) extending laterally opposite each other from the pair of guide protrusion base portions (21b), A pair of guide protrusions (22) protrude from the pair of guide protrusion bases (21b) toward the inner periphery of the crawler, The core metal (20) is embedded in the endless belt-shaped elastic body (11) except for at least the guide projection (22), In the elastic crawler (10) with a core metal, the rollers (5) arranged along the ground roll on the top surfaces (22f) of the guide projections (22), Wheel-off prevention projections (23A, 23B; 24A, 24B) project in both directions of the crawler circumferential direction from the pair of guide projection bases (21b, 21b) of the core metal body (21), By projecting in the crawler circumferential direction, the wheel derailment prevention projections (23A, 24A; 23B, 24B) projecting toward the opposing core bodies (21) of the adjacent cores (20) overlap each other in the crawler width direction, An elastic crawler with a core wire, characterized in that ribs (25, 25) are formed to connect the anti-wheel derailment protrusions (24A, 24B) on the core wire blade portion side to the core wire blade portion (21c, 21c) among the anti-wheel derailment protrusions (23A, 24A; 23B, 24B) that overlap each other in the crawler width direction.

2. The cored elastic crawler according to claim 1, characterized in that the crawler outer peripheral side surface (25d) of the rib (25) is located at the same position as the crawler outer peripheral side surface (21cd) of the cored blade portion (21c) or closer to the inner periphery of the crawler than the crawler outer peripheral side surface (21cd).

3. 2. The elastic crawler with core metal according to claim 1, wherein the rib (25) is raised on the inner circumferential side of the crawler.

4. A cored elastic crawler as described in claim 1, characterized in that the rib (25) overlaps in the crawler thickness direction with a steel cord layer (30) embedded on the outer periphery of the core blade portion (21c) of the endless strip-shaped elastic body (11).

5. A cored elastic crawler as described in any one of claims 1 to 4, characterized in that a pair of anti-wheel-slip protrusions (23A, 24A; 23B, 24B) that respectively protrude in one crawler circumferential direction from a pair of guide protrusion bases (21b, 21b) have different protrusion lengths.

6. The cored elastic crawler according to claim 5, characterized in that the difference (D1, D2) between the protrusion lengths of a pair of the anti-wheel-slip protrusions (23A, 24A; 23B, 24B) is 15% or less of the embedding pitch (P) of the core.

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