JP2016187975A - Rubber Crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber crawler capable of preventing the deterioration of fuel consumption performance of a crawler vehicle, while improving durability.SOLUTION: A crawler body 2 includes a center part CP reinforced by a core metal 3 in a crawler width direction b, and a pair of end parts SP bulging out from both ends in the crawler width direction b of the core metal 3. On an inner peripheral surface 2a of the crawler body 2, a reinforcing rib 7 projecting out to a crawler inner peripheral side ci and extending over the center part CP and the end parts SP is formed. The reinforcing rib 7 is provided with a stiffness lowering portion 8 for promoting the bending deformation of the crawler body 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a highly durable rubber crawler in which a core metal is embedded in a crawler body.

  Conventionally, a rubber crawler having a crawler main body formed of an elastic body and a plurality of metal cores embedded in the crawler main body is known. The crawler main body includes a central portion reinforced with a cored bar and a pair of end parts protruding outward from both ends of the cored bar in the crawler width direction. This end portion is more easily deformed than the central portion.

  When a large force is repeatedly applied to the end portion of the crawler body from the crawler outer peripheral side, there is a problem that stress is concentrated near the boundary between the center portion and the end portion of the crawler body, and cracks are generated in the crawler body.

  The following Patent Document 1 proposes a rubber crawler in which a high-hardness rubber is disposed at a position corresponding to a cored bar end of the crawler body. In such a rubber crawler, even when a large force is repeatedly applied to the end portion of the crawler body from the outer periphery of the crawler, the high-hardness rubber can suppress bending deformation between the central portion and the end portion of the crawler body. .

JP 2011-251578 A

  However, since the high-hardness rubber of the crawler body in Patent Document 1 is poor in flexibility, it becomes difficult to bend and deform in the circumferential direction of the crawler when the crawler body wraps around the drive wheel and the idler wheel. There was a problem of deteriorating performance.

  The present invention has been devised in view of the above circumstances, and is based on the formation of a reinforcing rib provided with a rigidity reduction portion on the inner peripheral surface of a crawler body, while improving durability, and a crawler vehicle. The main purpose is to provide a rubber crawler that can prevent the deterioration of the fuel efficiency performance.

  The present invention is a rubber crawler comprising a crawler main body formed in an endless belt shape by an elastic body, and a plurality of metal cores embedded in the crawler main body and extending in the crawler width direction, the crawler main body having a crawler width A central portion reinforced with the core metal and a pair of end portions protruding outward from both ends in the crawler width direction of the core metal, and an inner peripheral surface of the crawler main body includes a crawler inner peripheral side And a reinforcing rib extending so as to straddle the central portion and the end portion is formed, and the reinforcing rib is provided with a rigidity lowering portion for promoting bending deformation of the crawler body. It is characterized by.

  In the rubber crawler according to the present invention, it is desirable that the reduced rigidity portion is a concave groove extending in the crawler width direction.

  In the rubber crawler according to the present invention, it is desirable that the concave groove is provided on an inner peripheral side of the reinforcing rib.

  In the rubber crawler according to the present invention, it is preferable that a cross-sectional shape of the concave groove is a U-shape, an elliptical shape, or a semicircular shape.

  In the rubber crawler according to the present invention, it is preferable that the reinforcing rib extends to an outer end portion of the crawler body in the crawler width direction.

  In the rubber crawler according to the present invention, it is preferable that the reinforcing rib is terminated before an outer end portion in the crawler width direction of the crawler body.

  In the rubber crawler according to the present invention, the reinforcing rib is formed at a position where the cored bar overlaps with a cored bar projection area projected on the inner peripheral surface along the crawler thickness direction of the crawler body. desirable.

  In the rubber crawler according to the present invention, the reinforcing rib is formed at a position where the core metal does not overlap with a core metal projection region projected on the inner peripheral surface along the crawler thickness direction of the crawler body. Is desirable.

  In the rubber crawler according to the present invention, it is desirable that the arrangement pitch of the reinforcing ribs in the crawler circumferential direction is an integral multiple of the arrangement pitch of the cored bar in the crawler circumferential direction.

  In the rubber crawler according to the present invention, the crawler body has a wheel passing surface for contacting the wheel, and the reinforcing rib is formed on the outer side in the crawler width direction from the wheel passing surface. Is desirable.

  In the rubber crawler according to the present invention, it is desirable that the height of the reinforcing rib is 0.5 to 3.0 times the thickness of the wheel passing surface.

  In the rubber crawler according to the present invention, the length of the reinforcing rib in the crawler width direction is 0 of the distance between the outer end portion in the crawler width direction of the wheel passing surface and the outer end portion in the crawler width direction of the crawler body. It is desirable to be 3 to 1.0 times.

  In the rubber crawler according to the present invention, it is preferable that a ratio D / H between the depth D of the concave groove and the height H of the reinforcing rib is 0.67 or less.

  On the inner peripheral surface of the crawler body of the rubber crawler according to the present invention, a reinforcing rib is formed which protrudes toward the inner peripheral side of the crawler and extends across the central portion and the end portion. Such a reinforcing rib suppresses bending deformation between the central portion and the end portion of the crawler body even when a large force is repeatedly applied to the end portion of the crawler body from the outer peripheral side of the crawler body, and stress is concentrated near the boundary between them. You can relax. Therefore, the rubber crawler in which the reinforcing ribs are formed can prevent cracks and the like that are based on the vicinity of the boundary between the center portion and the end portion of the crawler body for a long period of time, and can improve the durability of the rubber crawler.

  Moreover, the rigidity reduction part for accelerating | stimulating the bending deformation of a crawler main body is provided in the reinforcement rib. Such a rigidity reduction part reduces the resistance required for bending deformation in the crawler circumferential direction when the crawler main body is wound around the driving wheel and the idler wheel. Therefore, the crawler vehicle equipped with the rubber crawler provided with the rigidity reduction portion is prevented from deteriorating fuel consumption during traveling.

It is a perspective view which shows one Embodiment of the rubber crawler of this invention. It is a top view which shows the rubber crawler of FIG. 1 from the crawler inner peripheral side. 2A is an enlarged view of a main part of FIG. 2, FIG. 3B is a cross-sectional view taken along line AA of FIG. 3A, and FIG. 3C is a cross-sectional view taken along line BB of FIG. (A) is sectional drawing which shows the ditch | groove of other embodiment, (b) is sectional drawing which shows the ditch | groove of other embodiment. (A) is a principal part enlarged view which shows the reinforcing rib of other embodiment, (b) is CC sectional view taken on the line of Fig.5 (a). It is a top view which shows the rubber crawler of other embodiment of this invention. It is a top view which shows the rubber crawler of other embodiment of this invention. It is a top view which shows the rubber crawler of other embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a rubber crawler 1 according to the present embodiment. FIG. 2 is a plan view showing the rubber crawler 1 of FIG. 1 from the inner peripheral side of the crawler. As shown in FIGS. 1 and 2, the rubber crawler 1 includes a crawler main body 2 formed in an endless belt shape by an elastic body, a plurality of core bars 3 embedded in the crawler main body 2 and a plurality of tensile bodies 4 ( 2 shows only a part).

  In the present specification, the crawler circumferential direction is the rotational direction of the rubber crawler 1, and corresponds to the up-down direction indicated by the symbol a in FIG. Further, the crawler width direction is the axial direction of the drive wheels, idle wheels, and wheels when the rubber crawler 1 is mounted on the vehicle, and corresponds to the left-right direction indicated by symbol b in FIG. Further, the crawler thickness direction is a direction orthogonal to the crawler circumferential direction and the crawler width direction, and corresponds to the up-down direction indicated by reference numeral c in FIG. In the crawler thickness direction, the inner side (upper side in FIG. 1) of the endless belt-like rubber crawler 1 is a crawler inner peripheral side ci. Further, the outer side (the lower side in FIG. 1) of the endless belt-like rubber crawler 1 is a crawler outer peripheral side co.

  As shown in FIGS. 1 and 2, the crawler body 2 is made of an elastic body such as rubber or resin. The crawler body 2 has a substantially constant width in the crawler width direction b, and a plurality of lugs 5 are disposed at substantially equal intervals in the crawler circumferential direction a on the crawler outer peripheral side co. When the rubber crawler 1 is mounted on the vehicle, the crawler main body 2 is in contact with an inner peripheral surface 2a that is a surface of the crawler inner peripheral side ci, so that a driving wheel, an idler wheel, a roller (not shown), etc. The driving force is transmitted to the ground plane via the lug 5. The rubber crawler 1 provided with such a crawler body 2 is less likely to damage the paved road even on the paved road, and has a good ride comfort.

  The cored bar 3 is formed of a hard metal material such as steel, for example. The core metal 3 has an elongated shape as a whole, and has a pair of protrusions 3a for guiding a drive wheel, an idle wheel, a wheel, and the like. The cored bar 3 is embedded in the crawler body 2 at equal intervals in the crawler circumferential direction a with the longitudinal direction directed in the crawler width direction b. At this time, the pair of protrusions 3a of the cored bar 3 protrudes from the crawler body 2 to the crawler inner peripheral side ci. The cored bar 3 retains the shape of the crawler body 2 and also has a function of more reliably transmitting the driving force from the driving wheels.

  The tensile body 4 is composed of a plurality of tensile cords such as steel cords, for example. The plurality of tensile bodies 4 are embedded in the crawler main body 2 at, for example, the crawler outer peripheral side co from the core metal 3 and the crawler inner peripheral side ci from the lug 5 in the crawler thickness direction c. . The tensile bodies 4 are arranged in the crawler width direction b, and are formed by being wound in the crawler circumferential direction a.

  FIG. 3A shows an enlarged view of the main part of FIG. 3B is a cross-sectional view taken along the line AA in FIG. 3A, and FIG. 3C is a cross-sectional view taken along the line BB in FIG. 2 and 3A, the crawler body 2 includes a central portion CP reinforced by the cored bar 3 in the crawler width direction b, and outer sides from both ends of the cored bar 3 in the crawler width direction b. A pair of end portions SP that protrudes are included. That is, the end portion SP of the crawler body 2 is located on both outer sides in the crawler width direction b of the central portion CP.

  As shown in FIGS. 1 to 3C, the central portion CP of the crawler body 2 has a pair of wheel passing surfaces 6 for contacting the wheel. As shown in FIGS. 1 and 3C, the wheel passing surface 6 is a smooth surface formed with a certain thickness t with respect to the reference surface Dp. Here, the reference surface Dp is a surface that connects both outer end portions 2e of the inner peripheral surface 2a of the crawler body 2. For easy understanding, in FIG. 1, a part of the reference plane Dp is lightly colored.

  As shown in FIG. 2, the wheel passing surface 6 has an inner end 6 i in the crawler width direction b adjacent to the protrusion 3 a of the core metal 3, and an outer end 6 e in the crawler width direction b is A predetermined distance W1 is provided from the inner end 6i.

  As shown in FIG. 1 to FIG. 3C, a reinforcing rib 7 is formed on the inner peripheral surface 2 a of the crawler main body 2 so as to protrude toward the crawler inner peripheral side ci. The reinforcing rib 7 is formed so as to straddle the central portion CP and the end portion SP. The reinforcing rib 7 of this embodiment can use the same material as the crawler main body 2, for example, and can be formed simultaneously when manufacturing the crawler main body 2. For this reason, the increase in the manufacturing cost of the rubber crawler 1 can be suppressed.

  The reinforcing rib 7 of the present embodiment is formed on the outer side in the crawler width direction b from the wheel passing surface 6, and extends to the outer end 2 e of the crawler body 2 in the crawler width direction b. That is, the inner end surface 7 i in the crawler width direction b is adjacent to the outer end portion 6 e in the crawler width direction b of the wheel passing surface 6. Further, the outer end surface 7e of the reinforcing rib 7 in the crawler width direction b is located at the outer end portion 2e of the crawler body 2 in the crawler width direction b.

  Such a reinforcing rib 7 suppresses bending deformation between the central portion CP and the end portion SP of the crawler body 2 even when a large force is repeatedly applied to the end portion SP of the crawler body 2 from the crawler outer peripheral side co. It is possible to alleviate the concentration of stress near the boundary. Therefore, the rubber crawler 1 provided with the reinforcing rib 7 prevents cracks and the like that are based on the vicinity of the boundary between the central portion CP and the end portion SP of the crawler body 2 for a long period of time, and improves the durability of the rubber crawler 1. Can be.

  As shown in FIG. 2, the reinforcing rib 7 of the present embodiment includes a cored bar projection region 3 b in which the cored bar 3 is projected on the inner peripheral surface 2 a of the crawler body 2 along the crawler thickness direction c of the crawler body 2. And the crawler circumferential direction a. For easy understanding, in FIG. 2, a part of the cored bar projection region 3b is lightly colored. The length L1 of the reinforcing rib 7 in the crawler circumferential direction a is not particularly limited, but is preferably substantially equal to the length LB of the core metal 3 in the crawler circumferential direction a.

  Such a reinforcing rib 7 can reinforce the crawler main body 2 in the vicinity of the core metal projection region 3b overlapping the reinforcing rib 7 over the entire length LB. Further, the reinforcing rib 7 can improve a certain range of rigidity in the crawler circumferential direction a of the crawler body 2 spreading around the reinforcing rib 7.

  As shown in FIGS. 1 and 2, the arrangement pitch P <b> 1 of the reinforcing rib 7 of the present embodiment in the crawler circumferential direction a is twice the arrangement pitch PB of the core metal 3 in the crawler circumferential direction a. Accordingly, all the reinforcing ribs 7 are formed at positions overlapping the cored bar projection region 3b in the crawler circumferential direction a. Such a reinforcing rib 7 suppresses bending deformation of the central portion CP and the end portion SP of the crawler body 2 near the reinforcing rib 7 and is adjacent to the core metal 3 where the reinforcing rib 7 and the core metal projection region 3b overlap. Bending deformation of the central portion CP and the end portion SP of the crawler main body 2 near the core metal 3 can be suppressed.

  As shown in FIGS. 1 and 3C, the height H of the reinforcing rib 7 from the reference surface Dp is preferably 0.5 to 0.5 mm of the thickness t from the reference surface Dp of the wheel passing surface 6. 3.0 times. If the height H of the reinforcing rib 7 is smaller than 0.5 times the thickness t, the reinforcing effect of the reinforcing rib 7 is reduced, and the durability of the rubber crawler 1 may not be improved so much. On the contrary, if the height H of the reinforcing rib 7 is larger than 3.0 times the thickness t, the crawler body 2 is required for bending deformation in the crawler circumferential direction a when it is wound around the drive wheel and the idle wheel. There is a risk that the resistance of the crawler vehicle becomes worse and the fuel efficiency when the crawler vehicle travels is deteriorated.

  As shown in FIGS. 1 to 3C, the reinforcing rib 7 is provided with a rigidity reduction portion 8 for promoting bending deformation of the crawler main body 2 in the crawler circumferential direction a. The rigidity reduction part 8 of this embodiment is formed as the ditch | groove 8a extended in the crawler width direction b, for example. Such a rigidity reduction part 8 reduces the resistance required for bending deformation in the crawler circumferential direction a when the crawler body 2 is wound around the drive wheel and the idler wheel. Therefore, the crawler vehicle equipped with the rubber crawler 1 provided with the rigidity reduction portion 8 is prevented from deteriorating fuel consumption during traveling.

  As shown in FIG. 3B, the cross-sectional shape of the concave groove 8a of the present embodiment is a U-shape. For this reason, it is easy to arbitrarily set the width and depth of the concave groove 8a, and can be appropriately set according to, for example, the rubber hardness of the crawler main body 2, the shape of the reinforcing rib 7, and the wheel diameter of the driving wheel.

  As shown in FIG. 3C, the ratio D / H between the depth D of the concave groove 8a and the height H of the reinforcing rib 7 is preferably 0.67 or less. When the ratio D / H is larger than 0.67, the reinforcing effect of the reinforcing rib 7 is reduced, and the durability of the rubber crawler 1 may not be sufficiently improved. The depth D of the concave groove 8a may be constant as shown in FIG. 3C or may be partially changed.

  As shown in FIG. 1 to FIG. 3C, the concave groove 8 a of this embodiment is formed for each reinforcing rib 7 over the entire length of the reinforcing rib 7 in the crawler width direction b. Such a concave groove 8 a can reduce the amount of rubber used for the reinforcing rib 7, and contributes to weight reduction of the rubber crawler 1. The concave groove 8a may be formed in a part of the reinforcing rib 7 in the crawler width direction b, for example.

  The cross-sectional shape of the concave groove 8a in the above embodiment is a U-shape, but is not limited to a U-shape and can be changed to various shapes.

  For example, Fig.4 (a) is sectional drawing which shows the ditch | groove 8b of other embodiment. As shown in FIG. 4A, the cross-sectional shape of the groove 8b may be an elliptical shape. The reinforcing rib 7 formed with such a concave groove 8b is easy to bend in the crawler circumferential direction a, and can further reduce the resistance required for bending deformation of the crawler body 2 in the crawler circumferential direction a.

  Moreover, FIG.4 (b) is sectional drawing which shows the ditch | groove 8c of other embodiment. As shown in FIG. 4B, the cross-sectional shape of the groove 8c may be a semicircular shape. Such a groove 8c has a large length in the crawler circumferential direction a of the opening on the crawler inner peripheral side ci, and even when the reinforcing rib 7 is bent greatly in the crawler circumferential direction a, the opening is less likely to close. For this reason, the resistance required for the bending deformation of the crawler body 2 in the crawler circumferential direction “a” is less likely to undergo an abrupt change accompanying the closing of the opening.

  Moreover, although the groove 8a of the said embodiment is formed one by one for each reinforcement rib 7, a plurality of the grooves 8a may be formed in each reinforcement rib 7. For example, Fig.5 (a) is a principal part enlarged view which shows the reinforcement rib 7 of other embodiment. FIG.5 (b) is CC sectional view taken on the line of Fig.5 (a). As shown in FIGS. 5A and 5B, the reinforcing rib 7 of this embodiment has, for example, two concave grooves 8d and 8d extending in the crawler width direction b aligned in the crawler circumferential direction a. It is formed with. Note that three or more concave grooves 8d may be formed.

  Since the stress acting on the concave groove 8d is dispersed in such a concave groove 8d, there is little possibility that a crack or the like having the concave groove 8d as a base end is generated, and the durability of the rubber crawler 1 can be further improved.

  Each concave groove 8d is preferably formed over the entire length of the reinforcing rib 7 in the crawler width direction b. Such a concave groove 8d can reduce the amount of rubber used for the reinforcing rib 7 and contributes to weight reduction of the rubber crawler 1. Note that some or all of the recessed grooves 8d may be formed in a part of the reinforcing rib 7A in the crawler width direction b.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to the said embodiment, It can deform | transform and implement in a various aspect. For example, the reinforcing rib 7 may be formed of a material different from that of the crawler body 2. Moreover, the rigidity reduction part 8 may be formed using low-hardness rubber etc., for example. Furthermore, the shape or arrangement of the reinforcing ribs 7 can be modified into various modes as shown below, for example. In other embodiments described below, the same components as those of the rubber crawler 1 are denoted by the same reference numerals and description thereof is omitted.

  FIG. 6 is a plan view showing a rubber crawler 11 according to another embodiment of the present invention. As shown in FIG. 6, the outer end surface 17 e in the crawler width direction b of the reinforcing rib 17 of this embodiment terminates, for example, before the outer end portion 2 e in the crawler width direction b of the crawler body 2. That is, the reinforcing rib 17 has an inner end surface 17 i in the crawler width direction b adjacent to an outer end portion 6 e in the crawler width direction b of the wheel passing surface 6. In addition, the outer end surface 17e of the reinforcing rib 17 in the crawler width direction b is an end portion of the crawler body 2 between the outer end portion 2e of the crawler width direction b of the crawler body 2 and the outer end portion 6e of the wheel passing surface 6. Located at SP.

  Such a reinforcing rib 17 changes the rigidity of the crawler main body 2 in the vicinity of the outer end surface 17e of the reinforcing rib 17 in the crawler width direction b. When a large force is applied to the end portion SP of the crawler body 2 from the crawler outer peripheral side co, the crawler body 2 is near the boundary between the center portion CP and the end portion SP of the crawler body 2 and the outer end surface 17e of the reinforcing rib 17. And two portions that are bent in the crawler width direction b. As a result, in the crawler main body 2, the stress acting near the boundary between the central portion CP and the end portion SP of the crawler main body 2 can be dispersed and relaxed.

  The length L of the reinforcing rib 17 in the crawler width direction b is preferably the crawler width between the outer end portion 6e of the roller passing surface 6 in the crawler width direction b and the outer end portion 2e of the crawler body 2 in the crawler width direction b. It is 0.3 to 1.0 times the distance W2 in the direction b. In the reinforcing rib 7 shown in FIG. 2, the length L in the crawler width direction b is 1.0 times the distance W2.

  If the length L of the reinforcing rib 17 is smaller than 0.3 times the distance W2, the reinforcing effect of the reinforcing rib 17 is reduced, and the durability of the rubber crawler 11 may not be sufficiently improved. When the length L of the reinforcing rib 17 is larger than 1.0 times the distance W2, the reinforcing rib 17 has an inner end surface 17i that protrudes to the wheel passing surface 6 side or an outer end surface 17e that is the outer end portion of the crawler body 2. It will protrude from 2e. If the reinforcing rib 17 protrudes to the wheel passing surface 6 side, it may affect the wheel support function of the rubber crawler 11. If the reinforcing rib 17 protrudes from the outer end portion 2e, damage such as a crack may occur from the protruding portion of the reinforcing rib 17.

  FIG. 7 is a plan view showing a rubber crawler 21 according to still another embodiment of the present invention. As shown in FIG. 7, the reinforcing rib 27 of this embodiment includes a cored bar projection region 3 b in which the cored bar 3 is projected on the inner peripheral surface 2 a of the crawler body 2 along the crawler thickness direction c of the crawler body 2. It is formed at a position that does not overlap. For easy understanding, a part of the cored bar projection region 3b is lightly colored in FIG. The length L2 of the reinforcing rib 27 in the crawler circumferential direction a is preferably substantially equal to the distance LC in the crawler circumferential direction a between the cored bars 3 adjacent to the reinforcing rib 27 in the crawler circumferential direction a. .

  Such a reinforcing rib 27 can improve a certain range of rigidity in the crawler circumferential direction a of the crawler body 2 spreading around the reinforcing rib 27. Therefore, the reinforcing rib 27 can suppress the bending deformation of the central portion CP and the end portion SP of the crawler body 2 near the cored bar 3 in which the cored bar projection region 3b is adjacent to the reinforcing rib 27 in the crawler circumferential direction a. For this reason, the reinforcing rib 27 can reinforce the crawler body 2 in the vicinity of each cored bar 3 more uniformly than the reinforcing rib 7 of FIG.

  FIG. 8 is a plan view showing a rubber crawler 31 according to still another embodiment of the present invention. As shown in FIG. 8, the arrangement pitch P2 of the reinforcing ribs 7 in this embodiment in the crawler circumferential direction a is equal to the arrangement pitch PB of the core metal 3 in the crawler circumferential direction a. Such reinforcing ribs 7 can suppress bending deformation of the central portion CP and the end portion SP of the crawler body 2 near all the core bars 3. The arrangement pitch P2 of the reinforcing rib 7 in the crawler circumferential direction a may be an integral multiple of the arrangement pitch PB of the core metal 3 in the crawler circumferential direction a, and may be, for example, three times.

  Each of the other embodiments described above can be implemented in combination with each other, and can be implemented with various modifications.

2 Crawler body 3 Core metal 7 Reinforcement rib 8 Reduced rigidity

Claims (13)

A rubber crawler comprising a crawler body formed in an endless belt shape by an elastic body, and a plurality of core bars embedded in the crawler body and extending in the crawler width direction,
The crawler body includes a central portion reinforced with the core metal in the crawler width direction, and a pair of end portions that protrude outward from both ends of the core metal in the crawler width direction,
Reinforcing ribs are formed on the inner peripheral surface of the crawler body so as to protrude to the inner peripheral side of the crawler and extend across the central portion and the end portion,
The rubber crawler according to claim 1, wherein the reinforcing rib is provided with a rigidity reduction portion for promoting bending deformation of the crawler body.   The rubber crawler according to claim 1, wherein the rigidity reduction portion is a concave groove extending in a crawler width direction.   The rubber crawler according to claim 2, wherein the concave groove is provided on an inner circumferential side of the reinforcing rib.   The rubber crawler according to claim 2 or 3, wherein a cross-sectional shape of the concave groove is a U shape, an elliptical shape, or a semicircular shape.   The rubber crawler according to any one of claims 1 to 4, wherein the reinforcing rib extends to an outer end portion of the crawler body in a crawler width direction.   The rubber crawler according to any one of claims 1 to 4, wherein the reinforcing rib is terminated before an outer end portion in a crawler width direction of the crawler body.   The reinforcing rib is formed at a position where the cored bar overlaps with a cored bar projection area projected on the inner peripheral surface along a crawler thickness direction of the crawler body. Rubber crawler.   The reinforcing rib is formed at a position where the core metal does not overlap with a core metal projection region projected on the inner peripheral surface along a crawler thickness direction of the crawler body. The rubber crawler described.   The rubber crawler according to claim 1, wherein an arrangement pitch of the reinforcing ribs in the crawler circumferential direction is an integral multiple of an arrangement pitch of the cored bar in the crawler circumferential direction. The crawler body has a wheel passing surface for contacting the wheel,
The rubber crawler according to any one of claims 1 to 9, wherein the reinforcing rib is formed on an outer side in a crawler width direction from the wheel passing surface.   The rubber crawler according to claim 10, wherein a height of the reinforcing rib is 0.5 to 3.0 times a thickness of the wheel passing surface.   The length of the reinforcing rib in the crawler width direction is 0.3 to 1.0 times the distance between the outer end portion in the crawler width direction of the wheel passing surface and the outer end portion in the crawler width direction of the crawler body. The rubber crawler according to claim 10 or 11.   The rubber crawler according to any one of claims 2 to 4, wherein a ratio D / H between a depth D of the concave groove and a height H of the reinforcing rib is 0.67 or less.

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