JP2013023158A - Core metal for crawler and rubber crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable core metals adjoining in a circumferential direction of a crawler belt 13 to be easily interconnected, without using dedicated parts for interconnection, and to achieve weight saving while securing durability.SOLUTION: A rubber crawler has a pair of guide walls 26 composed of an outer wall 26A that protrudes to an inner circumferential side of a crawler belt 13 and extends in a circumferential direction to interconnect an engagement shaft 22 and an engagement groove member 28, and is located at one side of a circumferential direction, an inside wall 26B located at the other side of the circumferential direction and arranged to overlap inside in width direction of the crawler belt 13 with respect to an outer wall 26A of core metals 20 adjoining in the circumferential direction, and an interconnecting wall 26C for interconnecting the outer wall 26A and the inside wall 26B. Lightening portions 26E, 26F are respectively provided at inside of the outer wall 26A and outside of the inside wall 26B in a width direction of the guide wall 26.

Description

  The present invention relates to a core metal for a crawler and a rubber crawler.

  Some rubber crawlers connect adjacent core bars using a connecting member such as a connecting ring in order to maintain the tension between the core bars (for example, Patent Document 1 and Patent Document 2). reference). Among these, Patent Document 1 discloses a rubber crawler in which a closing opening is formed in a wing portion of a cored bar, and a connecting body is hooked on the closing opening of an adjacent cored bar to connect adjacent cored bars together. Yes. In Patent Document 2, a bulging portion is formed on a wing portion of a core metal, the bulging portions of adjacent core bars are overlapped, and a bar is inserted into a circular air space between the bulging portions so that the adjacent core bars A link-type crawler in which the members are connected to each other is disclosed.

JP 2004-1595 A JP 2007-50771 A

  However, in the above-described conventional example, it is necessary to use some connecting member in order to connect the core bars adjacent in the circumferential direction of the crawler belt.

  In consideration of the above facts, the present invention makes it possible to easily connect the core bars adjacent to each other in the circumferential direction of the crawler belt without using a dedicated component for connection, and to reduce the weight while ensuring durability. The purpose is to plan.

  The invention according to claim 1 (the core metal for the crawler) is provided in parallel with the engagement shaft portion extending in the width direction of the endless crawler belt and the engagement shaft portion in the circumferential direction of the crawler belt. The engaging shaft portion of the cored bar adjacent to the engaging shaft member, the engaging groove member engaging in the circumferential direction, the inner shaft of the crawler belt projecting to the inner peripheral side, and extending in the circumferential direction, the engaging shaft portion and the engagement member. The groove member is connected to the outer wall portion located on one side in the circumferential direction, and the outer wall portion of the cored bar located on the other side in the circumferential direction and adjacent to the circumferential direction. An inner wall portion disposed so as to overlap the width direction inner side of the crawler belt, and a connection wall portion that connects the outer wall portion and the inner wall portion, and the inner side of the outer wall portion in the width direction and A pair of thinning portions provided on at least one of the outer sides of the inner wall portion It has a id wall portion.

  In the metal core for a crawler according to claim 1, the engagement shaft member of the metal core adjacent in the circumferential direction of the crawler belt is engaged with the engagement groove member of the metal core in the circumferential direction. Without using any dedicated parts, the core bars adjacent in the circumferential direction of the crawler belt can be easily connected. Further, with respect to the core bars adjacent to each other in the circumferential direction, the inner wall part of the guide wall part of the other core bar is overlapped with the inner side of the outer wall part of the guide wall part of one of the core bars, thereby It is possible to improve the rigidity.

  When the guide wall portions are overlapped with each other in this manner, bending stress due to a force acting in the width direction of the crawler belt and a torsional stress with the crawler belt thickness direction as the central axis are generated in each guide wall portion. These stresses are large on the outer side of the outer wall part and the inner side of the inner wall part in the width direction, and are smaller on the inner side of the outer wall part and the outer side of the inner wall part on the opposite side. Therefore, by providing the thinned portion on at least one of the inside of the outer wall portion and the outer side of the inner wall portion, which is a region where the stress is relatively small, it is possible to reduce the weight while ensuring the durability of the cored bar.

  According to a second aspect of the present invention (crawler cored bar), in the cored bar for crawler according to the first aspect, the lightening portion is a bottomed recess.

  In the metal core for a crawler according to claim 2, since the thinned portion is a bottomed concave portion, the durability of the cored bar is further improved as compared with the case where the thinned portion penetrates the guide wall portion. Many can be secured.

  According to a third aspect of the present invention (crawler cored bar), in the cored bar for a crawler according to the first or second aspect, the lightening portion is also provided on the connecting wall portion.

  In the core metal for a crawler according to claim 3, since the lightening portion is also provided in the connecting wall portion, the core metal can be further reduced in weight.

  The invention according to claim 4 (core metal for crawler) is the core metal for crawler according to any one of claims 1 to 3, wherein both ends of the guide wall portion in the circumferential direction are thinned. It is considered as a solid part without any.

  In the core metal for a crawler according to claim 4, since both ends in the circumferential direction of the guide wall portion are solid portions that are not thinned, stress can be borne at both ends. More durability can be ensured.

  A fifth aspect of the present invention (rubber crawler) is configured using the core metal for a crawler according to any one of the first to fourth aspects, and a rubber elastic body is disposed on the outer peripheral side of the crawler belt. ing.

  In the rubber crawler according to the fifth aspect, durability and weight reduction can be achieved.

  As described above, according to the crawler core bar according to claim 1 of the present invention, the core bars adjacent to each other in the circumferential direction of the crawler belt can be easily connected without using a dedicated connection part. In addition, an excellent effect is achieved that the weight can be reduced while ensuring the durability.

  According to the core metal for a crawler according to claim 2, it is excellent that the durability of the core metal can be ensured more as compared with the case where the thinned portion penetrates the guide wall portion. An effect is obtained.

  According to the core metal for a crawler according to claim 3, the excellent effect that the core metal can be further reduced in weight can be obtained.

  According to the core metal for a crawler according to claim 4, an excellent effect that more durability of the core metal can be secured is obtained.

  According to the rubber crawler according to the fifth aspect, an excellent effect that durability and weight reduction can be achieved.

It is a side view which shows a rubber crawler. It is a top view which shows the rubber crawler seen from the inner peripheral side. It is an enlarged plan view which shows the crawler belt seen from the inner peripheral side. It is an expanded sectional view which shows the connection state of the core metal adjacent to the circumferential direction of a crawler belt. It is a perspective view which shows the metal core for crawlers. It is a perspective view which shows the other example of the core metal for crawlers. It is a 7-7 arrow expanded sectional view in FIG. 5 which shows a guide wall part. (A) It is sectional drawing which shows a shape of the guide wall part which concerns on the comparative example 1 in the cross-sectional position equivalent to FIG. (B) It is sectional drawing which shows the shape of the guide wall part which concerns on the comparative example 2 in the cross-sectional position corresponded in FIG. (C) It is sectional drawing which shows the shape of the guide wall part which concerns on the comparative example 2 in the cross-sectional position corresponded in FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

(Rubber crawler)
In FIG. 1, a rubber crawler 10 according to this embodiment is used by being wound around a sprocket 100 and an idler 102 of a crawler vehicle, and an outer peripheral side of an endless crawler belt 13 formed by connecting a core metal 20. In addition, for example, an endless rubber elastic body 12 is provided. The crawler belt 13 is endless by sequentially connecting a plurality of crawler cores 20.

  Hereinafter, the term “circumferential direction” simply refers to the circumferential direction of the rubber crawler 10 (crawler belt 13) and is indicated by an arrow S. The “width direction” refers to the width direction of the rubber crawler 10 (crawler belt 13), and is indicated by an arrow W. The width direction is orthogonal to the circumferential direction. Furthermore, the “inside / outside direction” refers to the inside / outside direction of the rubber crawler 10 (crawler belt 13), and this inside / outside direction is indicated by arrows IN and OUT. An arrow IN indicates the inner peripheral side of the rubber crawler 10 (crawler belt 13), which is simply referred to as “inner peripheral side”. On the other hand, an arrow OUT indicates the outer peripheral side of the rubber crawler 10 (crawler belt 13), which is simply referred to as “outer peripheral side”.

  As shown in FIGS. 1 and 2, lugs 14 are formed on the outer peripheral surface of the rubber elastic body 12 at a predetermined interval in the circumferential direction. In this embodiment, the lug 14 is configured to extend along the width direction. However, the configuration is not limited thereto, and for example, the lug 14 may be configured to be inclined with respect to the width direction. The shape of the lug 14 may be any shape as long as the pulling force of the rubber crawler 10 can be sufficiently exhibited.

  A plurality of metal cores 20 for crawlers (see FIGS. 3 to 5) are embedded on the inner peripheral side of the rubber elastic body 12 at regular intervals in the circumferential direction. The plurality of metal cores 20 adjacent to each other in the circumferential direction are connected to each other, thereby forming an endless crawler belt 13. Details of the crawler belt 13 and the cored bar 20 will be described later.

  As shown in FIG. 2, a sprocket engagement hole 16 penetrating from the inner peripheral surface of the rubber elastic body 12 to the outer peripheral surface is formed at the center in the width direction of the rubber elastic body 12. The driving force from the sprocket 100 is transmitted to the rubber crawler 10 by the teeth of the sprocket 100 being engaged with the sprocket engagement hole 16. In this embodiment, the rubber elastic body 12 is formed with the sprocket engagement hole 16 in which the tooth portion 100A of the sprocket 100 is engaged (fitted), but the tooth portion of the sprocket 100 is engaged (fitted). ), A recess may be formed on the inner peripheral surface of the rubber elastic body 12.

  As shown in FIG. 5, the cored bar 20 is provided with a pair of guide wall portions 26 protruding toward the inner peripheral side. In FIG. 1, a sprocket 100 and an idler 102 pass between the pair of guide wall portions 26. Further, the crawler wheel is provided with a roller wheel 104 having, for example, a cylindrical large-diameter portion 104B and a cylindrical small-diameter portion 104A provided coaxially on the side surface of the large-diameter portion 104B. The small-diameter portion 104A of the roller wheel 104 passes over the top surface 26D of the guide wall portion 26, and the large-diameter portion 104B passes between the pair of guide wall portions 26. Specifically, the outer peripheral surface of the small-diameter portion 104A of the roller wheel 104 is grounded and supported by the top surface 26D of the guide wall portion 26 or rubber on the top surface 26D, whereas the outer peripheral surface of the large-diameter portion 104B. Is configured so as not to contact a rubber portion (rubber portion on the sprocket engaging portion 24) between the pair of guide wall portions 26.

  The wheel 104 may be provided with a small-diameter portion 104A on one side of the large-diameter portion 104B. The configuration of the wheel 104 may be other configurations. For example, the wheel 104 is provided on the small diameter portion 104A passing over the top surface 26D of each of the pair of guide wall portions 26 and on both sides of the small diameter portion 104A. And a pair of large diameter portions (not shown) that straddle the pair of guide wall portions 26. Further, the sprocket 100 and the idler 102 may be different from the present embodiment shown in FIG.

(Core for crawler)
2, the crawler core 20 is symmetrical in the width direction with respect to the center line CL in the width direction, and as shown in FIG. 5, the engagement shaft portion 22, the engagement groove member 28, And a pair of guide wall portions 26. The core metal 20 further has a pair of wing parts 30.

  The engagement shaft portion 22 extends in the width direction of the endless crawler belt 13. This engagement shaft part 22 is provided in the center part of the width direction in the metal core 20, and is formed in a columnar shape (circular cross section), for example.

  4 and 5, the engagement groove member 28 is juxtaposed with the engagement shaft portion 22 in the circumferential direction of the crawler belt 13 and opens to the outer peripheral side or the inner peripheral side of the crawler belt 13. The engagement groove member 28 is configured to have a concave surface having an arcuate cross section along the engagement shaft portion 22 on the outer peripheral side of the sprocket engagement portion 24 extending in the width direction. As shown in FIGS. 3 to 5, the engagement groove member 28 is provided in the center portion in the width direction of the cored bar 20, and the engagement shaft part 22 of the cored bar 20 adjacent in the circumferential direction and the Engage in the circumferential direction. By making the engagement groove member 28 into an arcuate concave surface along the engagement shaft portion 22, the engagement shaft portion 22 and the engagement groove member 28 are in the width direction (engagement shaft portion) in the engaged state. (Center axis 22) can be rotated around each other.

  The arc length of the engagement groove member 28 in the circumferential cross section is set slightly shorter than half the circumference of the engagement shaft portion 22. As a result, the engagement groove member 28 can be engaged with the engagement shaft portion 22 from, for example, the inner circumference side to the outer circumference side of the crawler belt 13.

  3 and 5, the pair of guide wall portions 26 protrude to the inner peripheral side of the crawler belt 13 and extend in the circumferential direction to connect the engagement shaft portion 22 and the engagement groove member 28. The pair of guide wall portions 26 includes an outer wall portion 26A, an inner wall portion 26B, and a connecting wall portion 26C. The outer wall portion 26A is located on the engagement shaft portion 22 side (one side in the circumferential direction). The inner wall portion 26B is located on the engagement groove member 28 side (the other side in the circumferential direction), and extends to, for example, a position on the inner circumference side of the engagement groove member 28. The inner wall portion 26B is disposed so as to overlap the inner side in the width direction of the crawler belt 13 with respect to the outer wall portion 26A of the cored bar 20 adjacent in the circumferential direction.

  In other words, in a state in which the adjacent core bars 20 are connected to each other, the inner wall portion 26B of one core bar 20 enters between the outer wall portions 26A of the other core bar 20 in a substantially parallel manner. . Thereby, in the state which connected the metal core 20 adjacent in the circumferential direction, when one metal core 20 and the other metal core 20 move relatively in the width direction, the inner side of the guide wall portion 26 of the metal core 20 When the wall portion 26 </ b> B and the outer wall portion 26 </ b> A of the guide wall portion 26 of the other core metal 20 come into contact with each other, relative movement in the width direction between the one core metal 20 and the other core metal 20 is restricted. It is like that.

  The connecting wall portion 26C connects the outer wall portion 26A and the inner wall portion 26B. Thereby, the guide wall part 26 is formed in the crank shape by planar view. The thickness of the guide wall 26 is uniform, for example. A reinforcing rib 26 </ b> R is formed on the outer side surface of the guide wall portion 26 in the width direction. The rib 26 </ b> R at the position of the inner wall portion 26 </ b> B is curved in an arc shape along the engagement groove member 28.

  As shown in FIGS. 5 to 7, a lightening portion 26E is provided inside the outer wall portion 26A in the width direction, and a lightening portion 26F is provided outside the inner wall portion 26B. The lightening portions 26E and 26F are bottomed concave portions, respectively. That is, the thinned portions 26E and 26F do not penetrate the guide wall portion 26, and the thickness of the guide wall portion 26 remains even at the positions of the thinned portions 26E and 26F. Thereby, the durability of the cored bar 20 can be secured more as compared with the case where the lightening portions 26E and 26F penetrate the guide wall portion 26 (not shown). Both ends of the guide wall portion 26 in the circumferential direction are solid portions 26H that are not hollowed out. The lightening portion 26 </ b> F extends to a position on the inner peripheral side of the engagement groove member 28.

  In the cross-sectional position shown in FIG. 7, the width direction dimension H is the same as the width direction dimension H1 (see FIG. 8A) of the guide wall portion 26 according to Comparative Example 1 described later that does not have the lightening portions 26E and 26F. It has become. Here, the dimension H in the width direction means that the inner wall portion 26B is restored from the outer side portion of the outer wall portion 26A at the circumferential position where the thinned portion 26E is located to the circumferential position where the thinned portion 26F is located. The distance to the inner part. As shown in FIGS. 2 to 4, the lightening portion 26 </ b> E and the lightening portion 26 </ b> F of the cored bar 20 adjacent in the circumferential direction are configured to partially overlap.

  In the present embodiment, the lightening portion 26E is also provided on the connecting wall portion 26C. Specifically, the thinned portion 26E is provided continuously from the inner side of the outer wall portion 26A to the inner side of the connecting wall portion 26C. Thereby, the metal core 20 can be further reduced in weight. Further, at the cross-sectional position shown in FIG. 7, the thickness t of the guide wall portion 26 from the thinned portion 26E to the thinned portion 26F can be equalized.

  In addition, the lightening part 26E may be provided inside the outer wall part 26A, and the lightening part 26F may be provided from the outer side of the inner wall part 26B to the inner side of the connecting wall part 26C. Further, the range of the lightening portions 26E and 26F is not limited to the illustrated range, and may be wider on the outer peripheral side. Further, the positions of the lightening portions 26E and 26F may be changed in the inner and outer directions, respectively. Further, the lightening portions 26E and 26F are not limited to a single concave portion, but may be a plurality of concave portions arranged. In that case, the stress distribution may be optimized by changing the size and depth of the recess depending on the region. The lightening portions 26E and 26F may be grooves.

  As shown in FIG. 5, a top surface 26 </ b> D that is an end surface on the inner peripheral side of the guide wall portion 26 is flat and configured to be able to guide the small diameter portion 104 </ b> A (FIG. 1) of the roller wheel 104. Yes. Specifically, as shown in FIGS. 2 and 3, the guide wall portions 26 are overlapped in the width direction in a state where the core bars 20 adjacent in the circumferential direction are connected. Therefore, as shown in FIG. 4, the guide wall portion 26 in the crawler belt 13 is in a continuous state without interruption in the circumferential direction. Thereby, the vibration of the rubber crawler 10 can be suppressed when the small-diameter portion 104A (FIG. 1) of the roller wheel 104 passes over the top surface 26D.

  Furthermore, when the crawler travels, the pair of guide wall portions 26 can appropriately guide the sprocket 100 and the idler 102 (FIG. 1). When the crawler travels, the tooth portion 100A of the sprocket 100 is engaged with the sprocket engaging portion 24, so that the driving force from the sprocket 100 is transmitted through the sprocket engaging portion 24 and the engaging shaft portion 22 to the crawler belt 13. It is transmitted to (rubber crawler 10).

  As shown in FIG. 5, the pair of wing portions 30 extend further outward in the width direction on both sides of the engagement shaft portion 22 in the width direction of the crawler belt 13 and on the width direction outer surface of the pair of guide wall portions 26. Has been. The wing portion 30 is formed with a groove 30A for weight reduction. Since the cored bar 20 includes the pair of wings 30, the input (load) from the road surface during crawler travel is also distributed to the pair of wings 30 so that the deformation of the cored bar 20 is suppressed. It has become. In addition, as FIG. 6 shows, the structure which the wing | blade part 30 does not have the groove | channel 30A (FIG. 5) may be sufficient.

  The pair of wing parts 30 is in line with the engagement shaft part 22 in the width direction, but is not limited to this, and if the root part of the wing part 30 overlaps with the engagement shaft part 22 in a side view, For example, you may extend inclining with respect to the width direction.

  Further, the wing portion 30 is tapered toward the tip, but is not limited to this, and may have a constant width, or may have a shape that is wider on the tip side than the root portion.

(Function)
This embodiment is configured as described above, and the operation thereof will be described below. 2 to 4, in the core metal 20 for crawlers according to this embodiment, the engagement shaft member 22 of the core metal 20 adjacent in the circumferential direction of the crawler belt 13 is engaged with the engagement groove member 28. Thus, the core bars adjacent to each other in the circumferential direction of the crawler belt 13 can be easily connected without using a dedicated component for connection. Thereby, the number of parts of the rubber crawler 10 (crawler belt 13) can be reduced.

  Further, in the rubber crawler 10 (crawler belt 13), with respect to the core bars 20 adjacent to each other in the circumferential direction, the guide wall section of the other core bar 20 is disposed inside the outer wall section 26A of the guide wall section 26 of the one core bar 20. The inner wall portions 26B of 26 are overlapped. Therefore, when the one core metal 20 and the other core metal 20 are relatively moved in the width direction, the outer wall portion 26A of the one core metal 20 and the inner wall portion 26B of the other core metal 20 are in contact with each other. The relative movement in the width direction of the one metal core 20 and the other metal core 20 is restricted. Thereby, the rigidity of the crawler belt 13 in the width direction can be improved.

  When the guide wall portions 26 are overlapped with each other in this way, as shown in FIG. 5, the crawler belt 13 is provided on each guide wall portion 26 when, for example, each cored bar 20 passes through the wheel 104 or the idler 102. Due to the force acting in the width direction, bending stress is generated in the direction of arrow A, and torsional stress with the thickness direction of the crawler belt 13 as the central axis is generated in the direction of arrow B, for example. These stresses increase when turning or when the rubber crawler 10 (crawler belt 13) is twisted. In addition, the direction of torsional stress changes with the relative moving directions of the core metal 20 adjacent to the circumferential direction.

  In FIG. 7, these stresses are large on the outside of the outer wall portion 26A and the inside of the inner wall portion 26B in the width direction, and are small on the inside of the outer wall portion 26A on the opposite side and on the outside of the inner wall portion 26B. . In other words, the stress burden is smaller on the inner side of the outer wall portion 26A and on the outer side of the inner wall portion 26B than on the outer side of the outer wall portion 26A and the inner side of the inner wall portion 26B.

  Therefore, even if the lightening portions 26E and 26F are provided inside the outer wall portion 26A and outside the inner wall portion 26B, stress can be borne on the outer side of the outer wall portion 26A and inside the inner wall portion 26B. The influence on the rigidity of the portion 26 is small. Moreover, since both ends of the guide wall portion 26 in the circumferential direction are solid portions 26H that are not hollowed out, stress can be borne at both ends. Thereby, weight reduction can be achieved, ensuring the durability of the cored bar 20. This also makes it possible to reduce the durability and weight of the rubber crawler 10.

(Test example)
About the guide wall part 26, bending rigidity and torsional rigidity were calculated | required about the Example shown by FIG. 7, and Comparative Examples 1-3 shown by FIG. 8 (A)-(C). 8A to 8C show the shape of the guide wall portion 26 at the cross-sectional position corresponding to FIG.

  In Comparative Example 1 shown in FIG. 8A, the guide wall portion 26 is configured to be solid. In Comparative Example 2 shown in FIG. 8B, a lightening portion 26G is provided on one outer side in the width direction from the outer wall portion 26A to the connecting wall portion 26C and the inner wall portion 26B. And the comparative example 3 shown by FIG.8 (C) provides the lightening parts 26E and 26F on the opposite side to an Example.

  Regarding the cross-sectional area (weight), the example having the thinned portions 26E and 26F and the comparative example 3 are the same in 67% of the comparative example 1, and the comparative example 2 having the thinned portion 26G is 64 of the comparative example 1. %.

  The results are as shown in Table 1. The numerical values in Table 1 are indicated by an index with Comparative Example 1 being 100, and the larger the numerical value, the better the result. About an Example, it turns out that the fall of bending rigidity and torsional rigidity can be suppressed, reducing a cross-sectional area (weight) to 67% with respect to the comparative example 1. FIG. This is because the width direction dimension H of the guide wall part 26 according to the embodiment is the same as the width direction dimension H1 of the solid guide wall part 26 according to Comparative Example 1 (FIG. 8A), This is probably because the stress that can be generated is large.

  In contrast, in Comparative Example 2, the bending rigidity is reduced to 48% of Comparative Example 1, and the torsional rigidity is reduced to 67% of Comparative Example 1. This is because the width direction dimension H2 (FIG. 8B) of the guide wall portion 26 is equal to that of the solid guide wall portion 26 according to the comparative example 1 by providing the thinned portion 26G on one side on the outer side in the width direction. This is considered to be because the stress that can be borne is reduced because it is smaller than the width direction dimension H1.

  In Comparative Example 3, the bending rigidity is reduced to 36% of Comparative Example 1, and the torsional rigidity is reduced to 54% of Comparative Example 1. This is because the width direction dimension H3 (FIG. 8C) of the guide wall part 26 is larger than the width direction dimension H2 according to the comparative example 2 by providing the lightening portions 26E and 26F on the opposite side to the embodiment. This is thought to be due to a decrease in the stress that can be borne and further reduced.

  From this test, it has been found that the provision of the lightening portions 26E and 26F as in the embodiment makes it possible to ensure both the durability of the guide wall portion 26 and the weight reduction.

DESCRIPTION OF SYMBOLS 10 Rubber crawler 12 Rubber elastic body 13 Crawler belt 20 Core metal 22 Engagement shaft part 26 Guide wall part 26A Outer side wall part 26B Inner side wall part 26C Connection wall part 26E Thickening part 26F Thickening part 28 Engaging groove member

Claims (5)

An engagement shaft portion extending in the width direction of the endless crawler belt;
An engagement groove member that is arranged in parallel with the engagement shaft portion in the circumferential direction of the crawler belt and engages in the circumferential direction with the engagement shaft portion of the cored bar adjacent to the circumferential direction;
An outer wall portion projecting to the inner circumferential side of the crawler belt and extending in the circumferential direction to connect the engagement shaft portion and the engagement groove member, and located on one side of the circumferential direction; and the circumferential direction An inner wall portion disposed on the other side of the crawler belt with respect to the outer wall portion of the cored bar adjacent in the circumferential direction, and the outer wall portion and the inner wall portion. A pair of guide wall portions, each of which is formed of a connecting wall portion that connects the wall portion, and at least one of the inner side of the outer wall portion and the outer side of the inner side wall portion in the width direction,
A cored bar for crawlers.   The cored bar for a crawler according to claim 1, wherein the lightening part is a bottomed concave part.   The core metal for a crawler according to claim 1, wherein the lightening portion is also provided on the connecting wall portion.   The core metal for a crawler according to any one of claims 1 to 3, wherein both ends of the guide wall portion in the circumferential direction are solid portions that are not thinned.   A rubber crawler configured using the crawler core bar according to any one of claims 1 to 4, wherein a rubber elastic body is disposed on an outer peripheral side of the crawler belt.

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