JP6479318B2 - Rubber crawler - Google Patents

Description

  The present disclosure relates to a rubber crawler including drive protrusions provided on an inner peripheral surface of an endless rubber elastic body with a constant pitch in a circumferential direction of the rubber elastic body.

  Rubber crawlers are generally used in high-speed vehicles because they are lighter and have less running resistance and vibration than metal crawlers. In this rubber crawler, for example, as described in Patent Document 1, a drive protrusion (rubber protrusion) that meshes with a sprocket in the center in the width direction of the inner peripheral surface of an endless rubber elastic body is provided in the circumferential direction. There is a rubber crawler (core rubberless rubber crawler in the literature) provided with a constant interval. The sprocket functions as a drive wheel.

  The driving protrusion meshes with the sprocket and transmits the driving force to the rubber crawler. Further, a low hardness rubber having a lower hardness than the rubber hardness of the outer portion of the rubber elastic body is formed on the inner peripheral surface of the inner peripheral surface of the rubber elastic body where the rollers on both sides in the width direction of the drive protrusion roll. It is provided in a belt shape in the circumferential direction of the rubber elastic body.

  In this rubber crawler, the rubber crawler rotates as the rubber elastic body wound around the sprocket rotates along with the rotation of the sprocket, thereby causing the vehicle to travel. The rubber elastic body rotates while being bent along the outer periphery of the sprocket when the rubber crawler is rotated. However, when the rubber elastic body is bent, the rigidity of the drive protrusion is relatively high. A portion between adjacent drive protrusions is bent.

JP2011-88613A

  However, since the rubber elastic body between the rubber protrusions is a high hardness rubber having a hardness higher than that of the low hardness rubber provided on the inner peripheral surface of the region where the rolling wheel rolls, There is a possibility that a large stress is generated in the rubber elastic body. In general, rubber is likely to burst with heat if repeated expansion and contraction is intense.

  For this reason, the outer and inner regions (hereinafter referred to as “peripheral regions”) than the region through which the wheel passes are formed of high-hardness rubber having a hardness higher than that of the low-hardness rubber. On the inner peripheral surface side, when repeated expansion and contraction becomes intense, the generated stress becomes relatively large, the life of the rubber is shortened, and there is a possibility that it will burst with heat. Furthermore, when the vehicle travels at a higher speed, the life of the rubber in the peripheral region is further shortened, and there is a possibility that the rubber is more likely to burst.

  In view of the above circumstances, at least some embodiments of the present invention provide a rubber crawler that can reduce the possibility of shortening the service life due to damage to the inner peripheral surface of the rubber crawler during rotation of the rubber crawler. With the goal.

A rubber crawler according to some embodiments of the present invention includes:
Guide protrusions that are provided in the center in the width direction of the inner peripheral surface of the endless rubber elastic body at intervals in the circumferential direction to prevent the wheel from being removed, and both widthwise outer sides of the inner peripheral surface. A rubber crawler provided with a drive protrusion arranged with a constant pitch in the circumferential direction and meshed with a sprocket,
Of the rubber elastic body, an inner portion in the thickness direction of the rubber elastic body including at least the drive protrusions and the guide protrusions adjacent to each other in the circumferential direction of the rubber elastic body is more than the inner portion in the thickness direction. It is comprised so that it may have hardness lower than the hardness of the thickness direction outer side part of the said rubber elastic body located outside.

  According to the rubber crawler, the rubber elastic body including at least the drive protrusions and the guide protrusions adjacent to each other in the circumferential direction of the rubber elastic body is the inner portion in the thickness direction. The rubber elastic body located on the outer side has a hardness lower than the hardness of the outer portion in the thickness direction. For this reason, since the inner portion in the thickness direction of the rubber elastic body other than the region where the roller wheel rolls is soft, the stress generated by the bending deformation when the rubber crawler passes through the sprocket is relatively small. Therefore, the durability of the entire rubber crawler can be improved. Therefore, it is possible to realize a rubber crawler that can reduce the risk of shortening the service life due to damage to the inner peripheral surface of the rubber crawler during rotation of the rubber crawler.

In some embodiments,
Of the rubber elastic body, the inner portion in the thickness direction only between the drive protrusions and the guide protrusions adjacent in the circumferential direction has a hardness lower than the hardness of the outer portion in the thickness direction of the rubber elastic body. Configured to be.

  In this case, the inner peripheral surface of the region where the wheel rolls out of the inner peripheral surface of the rubber elastic body has higher hardness than the inner portion in the thickness direction with low hardness. For this reason, the inner peripheral surface of the region where the roller rolls easily wears between the rollers and the rubber crawler due to dirt and sand sandwiched between them, but the inner peripheral surface of the region where the rollers roll is in the thickness direction. Since the hardness is higher than that of the inner part, it is possible to improve the durability (wear resistance) of the inner peripheral surface of the region where the rolling wheel rolls.

In some embodiments,
The guide protrusion provided at the center in the width direction of the inner peripheral surface of the rubber elastic body and the pair of drive protrusions provided on both outer sides in the width direction of the inner peripheral surface are included in the width direction of the inner peripheral surface. Arranged in a straight line in a direction perpendicular to the circumferential direction,
An inner portion in the thickness direction of the rubber elastic body is configured to include a region through which the wheel passes between the drive protrusions adjacent in the circumferential direction and between the guide protrusions adjacent in the circumferential direction.

  In this case, the guide protrusion and the pair of drive protrusions provided on both outer sides in the width direction of the inner peripheral surface are linearly arranged in a direction orthogonal to the circumferential direction in the width direction of the inner peripheral surface, The inner portion of the rubber elastic body in the thickness direction includes a region where a roller wheel passes between the drive protrusions adjacent in the circumferential direction and between the guide protrusions adjacent in the circumferential direction. The hardness of almost all of the region between the guide protrusion and the pair of drive protrusions arranged in a straight line and the protrusions adjacent in the circumferential direction can be reduced. For this reason, the soft area | region which bends at the time of bending of a rubber crawler can be expanded, the stress by bending deformation becomes smaller, and durability of a rubber crawler can be improved more. Therefore, it is possible to realize a rubber crawler that can further reduce the possibility of shortening the service life due to damage to the inner peripheral surface of the rubber crawler during rotation of the rubber crawler.

In some embodiments,
Inside the rubber elastic body, a steel cord extending in the circumferential direction is embedded,
An inner portion in the thickness direction of the rubber elastic body is configured to be provided on the inner side in the thickness direction than the steel cord.

  In this case, a steel cord extending in the circumferential direction is embedded inside the rubber elastic body, and the inner portion in the thickness direction of the rubber elastic body is provided on the inner side in the thickness direction than the steel cord. The rigidity of the entire rubber crawler can be improved. Further, since the inner portion in the thickness direction of the rubber elastic body is provided on the inner side in the thickness direction than the steel cord, the inner portion in the thickness direction having a low hardness is compressed and deformed when the rubber crawler is bent. For this reason, even if the inner portion in the thickness direction is compressed and deformed, the generated stress is small, so that the durability of the rubber crawler can be improved. For this reason, while improving the rigidity of a rubber crawler, the rubber crawler which can reduce a possibility that the internal peripheral surface of a rubber crawler will be damaged etc. and lifetime may be shortened can be provided.

In some embodiments,
The end surface on the inner peripheral surface side of the inner portion in the thickness direction of the rubber elastic body is configured to be exposed on the inner peripheral surface.

  In this case, since the inner portion in the thickness direction is arranged at the portion with the smallest bending radius, the durability of the inner peripheral surface of the rubber elastic body can be further improved when the rubber crawler is bent. Therefore, it is possible to realize a rubber crawler that can more effectively reduce the risk of shortening the service life due to damage to the inner peripheral surface of the rubber crawler during rotation of the rubber crawler.

  According to at least some embodiments of the present invention, it is possible to provide a rubber crawler that can reduce the risk of shortening the service life due to damage to the inner peripheral surface of the rubber crawler during rotation of the rubber crawler.

A partial perspective view of a traveling device in which a sprocket is provided on one end side, a driven wheel is provided on the other end side, and a plurality of wheels are provided for rolling on the inner peripheral surface of a rubber crawler wound around these. FIG. It is a perspective view of a sprocket. It is a perspective view of a wheel. (A) is a partial plan view of the inner peripheral surface side of the rubber crawler, (b) is a partial side view of the rubber crawler, and (c) is a partial side view of the bent rubber crawler. is there. It is sectional drawing of the rubber crawler of the part corresponded to the IV-IV arrow of FIG.4 (b). FIG. 5A shows a partial plane on the inner peripheral surface side of the rubber crawler when low-altitude rubber provided between drive protrusions adjacent in the circumferential direction is provided from one end in the width direction of the drive protrusion to the front of the other end. FIG. 6B is a partial plan view of the inner peripheral surface side of the rubber crawler when the low-altitude rubber is provided from the other end in the width direction of the drive protrusion to the front of the one end. ) Is a partial plan view on the inner peripheral surface side of a rubber crawler in which low-altitude rubber is provided at an intermediate portion in the width direction of the drive protrusion. FIG. 4A is a partial plan view of the inner peripheral surface side according to another embodiment of the rubber crawler, and FIG. 4B is a partial side view according to another embodiment of the rubber crawler. It is sectional drawing of the rubber crawler concerning other embodiment of the part corresponded to the II-II arrow of FIG.2 (b).

  Hereinafter, embodiments of the rubber crawler according to the present invention will be described with reference to FIGS. In this embodiment, a traveling device provided in a vehicle will be described as an example. First, before explaining the rubber crawler of the present invention, an outline of a traveling device including a rubber crawler will be given. It should be noted that the materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely illustrative examples.

  As shown in FIG. 1 (partial perspective view), the traveling device 1 includes a driving wheel 10 that is rotatably supported at one end portion in a front-rear direction of a side portion of a vehicle body (not shown), and a front-rear direction of a side portion of the vehicle body. Rolls on a driven wheel (not shown) rotatably supported at the other end, a rubber crawler 20 wound around the drive wheel 10 and the driven wheel, and an inner peripheral surface below the rubber crawler 20. And a plurality of rolling wheels 60.

  As shown in FIG. 2 (perspective view), the driving wheel 10 is rotatable by receiving a driving force from an engine or the like provided in the vehicle. The drive wheel 10 includes a pair of sprockets 11 arranged to face each other at a certain interval in the width direction, and the pair of sprockets 11 are attached to the tip of a drive shaft extending from the vehicle to form the drive wheel 10. ing. A plurality of tooth portions 12 are formed on the outer peripheral edge of the sprocket 10 with a constant interval in the circumferential direction. The tooth portion 12 meshes with the driving protrusion 40 of the rubber crawler 20 to transmit a rotational force to the rubber crawler 20. Inside the sprocket 10, there is provided a guide roller 13 disposed on a concentric shaft with the sprocket 10 for preventing the wheel from being removed from the rubber track 20. Between the guide rollers 13 of the pair of sprockets 11, a gap 13 is provided through which a guide projection 30 provided at the center in the width direction of the rubber crawler 20 can pass. For this reason, the driving wheel 10 can transmit the rotational force of the driving wheel 10 to the rubber crawler 20 without being removed from the rubber crawler 20 by the pair of guide rollers 13.

  As shown in FIG. 3 (perspective view), the wheel 60 includes a pair of wheel main bodies 61 that are opposed to each other with a certain interval in the width direction, and the pair of wheel main bodies 61 are separated from the vehicle body of the vehicle. It is rotatably attached to the tip of an extending support shaft (not shown). The support shaft is supported so as to be movable in the vertical direction with respect to the vehicle body of the vehicle. A rubber annular body 63 is attached to the outer peripheral surface of the roller body 61. The annular body 63 can absorb the impact received from the road surface. Like the pair of sprockets 10, a gap 65 through which the guide protrusion 30 of the rubber crawler 20 can pass is provided between the pair of wheel main bodies 61.

  Next, the rubber crawler 20 according to the present invention will be described. The rubber crawler 20 is endless as shown in FIG. 1, FIG. 4 (a) (inner peripheral surface side partial plan view), FIG. 4 (b) (partial side view), and FIG. 4 (c) (partial side view). Rubber-like elastic body 21, and a guide protrusion 30 provided at a central portion in the width direction of the inner peripheral surface 21a of the rubber elastic body 21 with a constant interval in the circumferential direction to prevent the wheel 60 from being removed. The rubber elastic body 21 includes drive protrusions 40 that are provided on both outer sides in the width direction of the inner peripheral surface 21a with a constant pitch in the circumferential direction and mesh with the sprocket 10.

  The rubber elastic body 21 is made of rubber, has an endless shape, and is formed in a band shape. A plurality of lugs 22 are formed on the outer peripheral surface 21 b of the rubber elastic body 21 so as to protrude outward in the radial direction and are provided at intervals in the circumferential direction of the rubber elastic body 21.

  On the other hand, the guide protrusions 30 provided on the inner peripheral surface 21a of the rubber elastic body 21 are formed in a substantially rectangular parallelepiped shape extending in a direction substantially orthogonal to the inner peripheral surface 21a. The guide protrusion 30 is formed so as to gradually taper away from the inner peripheral surface 21a of the rubber elastic body 21 in a side view. For this reason, when the rubber crawler 20 rotates while being bent to the sprocket 10, the guide protrusions 30 adjacent to each other in the circumferential direction of the rubber crawler 20 are prevented from contacting each other (see FIG. 4C).

  The guide protrusion 30 has a size capable of passing through the gap 13 between the pair of sprockets 10 and the gap 65 between the pair of wheel bodies 61 of the wheel 60, and the wheel 60 is detached from the rubber crawler 20. It has a height that can be restricted from rolling. The height of the guide protrusion 30 is larger than the height of a drive protrusion 40 described later (see FIG. 4B).

  The drive protrusions 40 provided on both sides in the width direction of the inner peripheral surface 21a of the rubber elastic body 21 are formed in a substantially semicircular shape so as to gradually taper away from the inner peripheral surface 21a of the elastic body 21 in a side view. In the plan view, it is formed in a horizontally long rectangular shape. The drive protrusions 40 are provided on the inner peripheral surface 21 a with the same pitch as the teeth 11 of the sprocket 10. For this reason, the drive protrusion 40 meshes well with the tooth portion 11 of the sprocket 10, and the driving force of the sprocket 10 is transmitted to the rubber elastic body 21 via the drive protrusion 40.

  The pair of drive protrusions 40 provided on both sides in the width direction of the inner peripheral surface 21a of the rubber elastic body 21 together with the guide protrusion 30 provided in the center portion in the width direction of the inner peripheral surface 21a are arranged in the circumferential direction of the rubber elastic body 21. Are arranged in a straight line in a direction perpendicular to.

  As shown in FIG. 5 (sectional view), the rubber elastic body 21 is provided with a steel cord 45 extending continuously in the circumferential direction at an intermediate portion in the thickness direction. The steel cord 45 is juxtaposed from the lower part of the drive protrusion 40 on one end side in the width direction of the rubber elastic body 21 to the lower part of the drive protrusion 40 on the other end side without a gap. The steel cord 45 is, for example, brass-plated on the surface of an iron linear member having a diameter of 5 mm.

  A bias cord 47 is provided between the drive protrusions 40 provided on the both sides in the width direction of the rubber elastic body 21 at a proximity position above and below the steel cord 45. The bias cord 47 is disposed so as to be inclined with respect to the circumferential direction of the rubber elastic body 21. The bias cord 47 is a linear member made of metal (steel, brass, synthetic fiber) having a diameter of 1 mm, for example. The steel cord 45 increases the rigidity in the circumferential direction of the rubber crawler 20, and the bias cord 47 increases the rigidity in the width direction of the rubber crawler 20.

  As shown in FIGS. 4A, 4B, and 5, the rubber elastic body 21 is formed on the inner side in the thickness direction of the rubber elastic body 21 between the drive protrusions 40 and the guide protrusions 30 adjacent to each other in the circumferential direction. The hardness of the portion 24 is lower than the hardness (80 degrees or more and less than 100 degrees) of the rubber elastic body 21 excluding the thickness direction inner portion 24 (hereinafter referred to as “thickness direction outer portion 26”) (65 degrees). More than 85 degrees). The relative difference between the low hardness and the high hardness may be, for example, 1 degree or more.

  In addition, the measurement of hardness uses a spring type hardness tester, for example. In this tester, when the pressing surface is brought into contact with the surface of the rubber elastic body 21, the distance by which the push needle protruding from the center hole of the pressing surface by the spring pressure is pushed back by the rubber surface is measured as the hardness. Configured. In order to make the thickness direction inner portion 24 easier to see, in FIG. 4A and FIG. 4B, the thickness direction inner portion 24 is hatched.

  The inner portion 24 in the thickness direction is disposed closer to the inner peripheral surface 21a of the rubber elastic body 21 than the steel cord 45 and the bias cord 47, and the end surface 24a on the inner peripheral surface side of the inner portion 24 in the thickness direction is exposed. doing. The inner portion 24 in the thickness direction disposed between the drive protrusions 40 adjacent to each other in the circumferential direction is provided from one end to the other end of the drive protrusion 40 in the width direction in plan view. Further, the thickness direction inner portion 24 disposed between the guide protrusions 30 adjacent to each other in the circumferential direction is provided from one end to the other end in the width direction of the guide protrusion 30 in a plan view.

  Next, the operation of the rubber crawler 20 will be described with reference to FIGS. 1 and 4C. As shown in FIG. 1, when the driving wheel 10 rotates, the rubber crawler 20 rotates with the rotation of the driving wheel 10. When a part of the rubber elastic body 21 of the rubber crawler 20 is wound around the sprocket 10 during the rotation of the rubber crawler 20, the part of the rubber elastic body 21 is expanded on the outer peripheral surface side and compressed on the inner peripheral surface side. Then bend. And if a part of rubber elastic body 21 leaves | separates from the sprocket 10, it will return to the state extended straight in the circumferential direction. Then, as the rubber crawler 20 further rotates, a part of the rubber crawler 20 passes around the plurality of roller wheels 60 and is then wound around a driven wheel (not shown). A part of the rubber crawler 20 wound around the driven wheel is bent so that the outer peripheral surface side of the rubber elastic body 21 extends and the inner peripheral surface side of the rubber elastic body 21 is compressed, as in the case of the sprocket 10. . A part of the rubber crawler 20 circulates between the sprocket 10 and the driven wheel in the same manner.

  Here, when a part of the rubber crawler 20 is wound around the drive wheel 10, the rubber crawler 20 bends along the outer periphery of the sprocket 10 as shown in FIG. The inner peripheral surface 21a side of 21 is compressed. The thickness direction inner portion 24 of the rubber elastic body 21 has a hardness lower than the hardness of the thickness direction outer portion 26 of the rubber elastic body 21. For this reason, since the thickness direction inner part 24 is soft, the stress which generate | occur | produces by the deformation | transformation at the time of the bending of the rubber elastic body 21 is comparatively small. For this reason, the durability of the rubber crawler 20 can be improved. Therefore, it is possible to realize the rubber crawler 20 that can reduce the possibility that the inner peripheral surface 21a of the rubber crawler 20 is damaged and the life is shortened when the rubber crawler 20 is rotated.

  In the above-described embodiment, the case where the thickness direction inner portion 24 of the rubber elastic body 21 between the drive protrusions 40 is provided from one end to the other end in the width direction of the drive protrusion 40 is shown in FIG. As shown to (a), you may provide from the width direction inner side end of the drive protrusion 40 to the site | part inside the width direction outer side end. In this way, since the thickness direction inner portion 24 is connected to the inner peripheral surface 21a of the rubber elastic body 21 on which the rolling wheel 60 rolls, the thickness direction inner portion 24 is deformed when the rolling wheel 60 passes. The passing of the rolling wheel 60 can be made smooth.

  Further, as shown in FIG. 6B, the thickness direction inner portion 24 may be provided from a portion outside the width direction inner end of the drive protrusion 40 to a portion of the width direction outer end. In this case, the thickness direction outer portion 26 having a higher hardness than the thickness direction inner portion 24 is formed between the width direction inner end of the drive protrusion 40 and the thickness direction inner portion 24.

  Furthermore, as shown in FIG. 6C, the thickness direction inner portion 24 may be provided from a portion outside the width direction inner end of the drive protrusion 40 to a portion inside the width direction outer end. Good. In this case, the portion between the inner end in the width direction of the driving protrusion 40 and the inner portion 24 in the thickness direction and the outer portion of the inner portion 24 in the thickness direction are on the outer side in the thickness direction higher in hardness than the inner portion 24 in the thickness direction. A portion 26 is formed. By doing so, the inner portion 24 in the thickness direction is evenly arranged in the width direction of the rubber crawler 20, so that the flexibility of the rubber crawler 20 can be stabilized.

  Thus, by making the length in the width direction of the inner portion 24 in the thickness direction of the rubber elastic body 21 between the drive protrusions 40 shorter than the length in the width direction of the drive protrusion 40, the inner side in the thickness direction that is the minimum required for bending is provided. The rubber crawler 20 having the width of the portion 24 and capable of ensuring the rigidity of the entire rubber crawler 20 can be realized.

  Further, as shown in FIG. 7A (partial plan view) and FIG. 7B (partial side view), the thickness direction inner portion 24 of the rubber elastic body 21 is in the circumferential direction of the rubber elastic body 21 described above. Are not limited between the drive protrusions 40 adjacent to each other and between the guide protrusions 30, but also a region 67 through which the wheel 60 passes between the drive protrusions 40 adjacent in the circumferential direction and between the guide protrusions 30 adjacent in the circumferential direction. It may be included. 7A and 7B, the thickness direction inner portion 24 is hatched to make the thickness direction inner portion 24 of the rubber elastic body 21 easier to see.

  In other words, the thickness direction inner portion 24 of the rubber elastic body 21 includes a guide protrusion 30 and a pair of drive protrusions 40 that are linearly arranged in the width direction of the rubber elastic body 21, and guide protrusions that are adjacent in the circumferential direction. 30 and a region 68 between the pair of drive protrusions 40. For this reason, the low hardness portion of the rubber elastic body 21 is increased, and the rubber elastic body 21 can be easily bent when the rubber crawler 20 is bent. Therefore, since the stress generated by the deformation of the rubber crawler 20 when the rubber crawler 20 is bent becomes smaller in the thickness direction inner portion 24 of the rubber elastic body 21, the durability on the inner peripheral surface side of the rubber crawler 20 can be further improved. it can. Therefore, it is possible to realize the rubber crawler 20 that can further reduce the possibility that the inner peripheral surface 21a of the rubber crawler 20 is damaged and the life is shortened when the rubber crawler 20 is rotated.

  Further, in the above-described embodiment, the end surface 24a on the inner peripheral surface side of the thickness direction inner portion 24 of the rubber elastic body 21 is shown as being exposed (see FIG. 5). However, as shown in FIG. You may arrange | position so that the direction inner part 24 may be embed | buried in the rubber elastic body 21 of the inner peripheral surface 21a side rather than the steel cord 45 and the bias cord 47. FIG. In this case, rubber having a hardness higher than the hardness of the thickness direction inner portion 24 is provided on the upper surface of the thickness direction inner portion 24. By comprising in this way, the abrasion resistance of the internal peripheral surface 21a of the rubber elastic body 21 can be improved.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the object of the present invention. For example, the various embodiments described above may be combined as appropriate.

DESCRIPTION OF SYMBOLS 1 Traveling device 10 Drive wheel 11 Sprocket 12 Tooth part 13 Guide roller 15, 65 Clearance 20 Rubber roller 21 Rubber elastic body 21a Inner peripheral surface 21b Outer peripheral surface 22 Lug 24 Thickness direction inner part 24a End surface 26 Thickness direction outer part 30 Guide protrusion 40 Driving projection 45 Steel cord 47 Bias cord 60 Rolling wheel 61 Rolling wheel body 63 Annular body 67, 68 Area

Claims (5)

Guide protrusions that are provided in the center in the width direction of the inner peripheral surface of the endless rubber elastic body at intervals in the circumferential direction to prevent the wheel from being removed, and both widthwise outer sides of the inner peripheral surface. A rubber crawler provided with a drive protrusion arranged with a constant pitch in the circumferential direction and meshed with a sprocket,
Inside the rubber elastic body, a steel cord extending in the circumferential direction is embedded,
An inner portion in the thickness direction of the rubber elastic body including at least the drive protrusions and the guide protrusions adjacent to each other in the circumferential direction of the rubber elastic body on the inner side in the thickness direction than the steel cord of the rubber elastic body. , Having a hardness lower than the hardness of the portion excluding the inner portion in the thickness direction ,
The inner portion in the thickness direction is embedded in the rubber elastic body,
A hardness of the rubber elastic body between an end surface on the inner peripheral surface side of the inner portion in the thickness direction and the inner peripheral surface is higher than a hardness of the inner portion in the thickness direction. Rubber crawler. The thickness direction inside portion of the rubber elastic body, rubber crawler according to claim 1, characterized in that the between the drive projections circumferentially adjacent consists only between the guide projections. The guide protrusion provided at the center in the width direction of the inner peripheral surface of the rubber elastic body and the pair of drive protrusions provided on both outer sides in the width direction of the inner peripheral surface are included in the width direction of the inner peripheral surface. Arranged in a straight line in a direction perpendicular to the circumferential direction,
The thickness direction inner part of the rubber elastic body includes a region through which the wheel passes between drive protrusions adjacent in the circumferential direction and between guide protrusions adjacent in the circumferential direction. The rubber crawler according to 1. The steel cord is disposed over a lower part of the other end side driving projection provided on the other end side from a lower part of the one end side driving projection provided on the one end side in the width direction of the rubber elastic body,
Inside the rubber elastic body, a bias cord disposed to be inclined with respect to the circumferential direction is embedded,
The bias cord is an adjacent position above or below the steel cord, and is disposed between the one end side driving protrusion and the other end side driving protrusion.
The rubber crawler according to any one of claims 1 to 3. The inner part in the thickness direction is embedded in the rubber elastic body closer to the inner peripheral surface than the steel cord and the bias cord.
The rubber crawler according to claim 4.

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