JP5818649B2 - Elastic crawler - Google Patents

Description

  The present invention relates to an elastic crawler.

  In recent years, endless rubber crawlers have been used in traveling parts of agricultural machines, construction machines, and civil engineering machines. This type of rubber crawler is usually used by being wound around a driving wheel, idler wheel, and roller wheel on the airframe side. Since these driving wheels, idler wheels, and rolling wheels roll on the inner peripheral side of the rubber crawler, reinforcing metal bars are embedded at regular intervals in the crawler circumferential direction on the inner peripheral portion of the rubber crawler. (For example, refer to Patent Document 1).

  In the rubber crawler described in Patent Document 1, a plurality of pairs of drive protrusions, which are rubber-coated with a pair of corner portions provided on the core metal, are formed on the inner peripheral portion at intervals in the crawler circumferential direction. The drive wheels pass between the drive protrusions. Further, a rubber support portion is formed on the inner peripheral portion of the rubber crawler between the core bars adjacent to each other in the crawler peripheral direction and between the pair of corner portions so as to protrude on the inner peripheral side of the crawler and support the driving wheel on the top surface. ing. By this rubber support portion, noise and vibration due to a collision with the core metal when the driving wheel is transferred from the top surface of the rubber support portion to the top surface of the adjacent rubber support portion are suppressed.

JP 11-222170 A

  However, in the rubber crawler of Patent Document 1, since the rubber support portion that supports the driving wheel is formed on the inner peripheral portion, resistance to bending (inner bending) in the crawler circumferential direction when winding around the driving wheel or the idle wheel. Has increased.

  An object of this invention is to suppress the increase in the bending resistance of the circumferential direction, suppressing the noise and vibration at the time of driving | running | working.

  An elastic crawler according to claim 1 of the present invention includes an endless belt-like elastic body wound around a driving wheel and an idler wheel, and a plurality of core bars embedded in the elastic body at intervals in the circumferential direction of the elastic body And a pair of engaging recesses formed between the core bars adjacent to each other in the circumferential direction of the inner peripheral portion of the elastic body and into which a pair of left and right tooth portions provided on the drive wheel are respectively inserted and engaged, Formed between the core bars adjacent to each other in the circumferential direction of the inner peripheral portion and between the pair of engaging recesses, bulges on the inner peripheral side of the elastic body, supports the idler wheel on the top surface, And a support portion in which a secondary moment of section with respect to the bending in the circumferential direction in a state where the elastic body is wound gradually decreases from an end portion in the circumferential direction to an intermediate portion.

  In the elastic crawler according to the first aspect of the present invention, when the driving wheel rotates in a state where the pair of left and right tooth portions of the driving wheel are inserted and engaged with the engaging recess, the driving force is transmitted to the endless belt-like elastic body. Thus, this elastic body circulates between the drive wheel and the idler wheel. At this time, the idler wheel moves from the top surface of the support portion to the top surface of the support portion adjacent in the circumferential direction of the elastic body (hereinafter, simply referred to as “elastic body circumferential direction”), while sequentially supporting each support portion. Roll on top of

  Here, in the above-mentioned elastic crawler, the support portion that protrudes from the inner peripheral portion to the inner peripheral side of the crawler and that supports the idler wheel is formed on the top surface. As compared with the above, when the idler wheel is transferred from the top surface of the support part to the top surface of the support part adjacent in the elastic body circumferential direction, the collision between the idler wheel and the metal core is avoided, or the idler wheel and the metal core Can be reduced (buffered). Thereby, noise and vibration during traveling are suppressed.

  Note that the collision between the idler wheel and the metal core mentioned here includes a direct or indirect collision, and the indirect collision is an idle motion between the metal core and the core metal through an elastic body covering the metal core. Refers to a collision with a wheel.

  On the other hand, in the above-described elastic crawler, the second moment of the section with respect to the bending in the elastic body circumferential direction in the state where the elastic body is wound is gradually reduced from the end portion in the elastic body circumferential direction to the intermediate portion. For example, the elastic body circumference of the support portion is larger than that in which the cross-sectional secondary moment of the support portion is increased from the end in the circumferential direction of the elastic body to the middle portion or the cross-sectional secondary moment is constant. Directional bending resistance is reduced. Thereby, the increase in the bending resistance of the elastic crawler in the circumferential direction of the elastic body is suppressed.

  The bending resistance in the circumferential direction of the elastic body here means resistance to bending deformation when the elastic crawler is wound around the driving wheel or idler wheel and bent along the outer periphery of each of the driving wheel or idler wheel. Pointing.

  From the above, according to the elastic crawler according to claim 1 of the present invention, it is possible to suppress an increase in circumferential bending resistance while suppressing noise and vibration during traveling.

The elastic crawler according to claim 2 of the present invention is the elastic crawler according to claim 1, wherein the support portion has a width along the width direction of the elastic body of the top surface from an end portion in the circumferential direction. The cross-sectional area along the width direction decreases while gradually decreasing toward the center.

  In the elastic crawler according to claim 2 of the present invention, the width of the support portion along the elastic body width direction on the top surface where the bending stress (compression) is maximized is set to the circumference of the elastic body of the top surface. Since the cross-sectional area along the elastic body width direction is decreased while gradually decreasing from the end in the direction toward the center, the bending resistance of the support portion in the circumferential direction of the elastic body can be further reduced.

The elastic crawler according to a third aspect of the present invention is the elastic crawler according to the first aspect, wherein the support portion has an end in the circumferential direction having a width along the width direction of the elastic body at the bottom of the support portion. It gradually decreases from the center toward the center.

  In the elastic crawler according to claim 3 of the present invention, the width of the bottom portion of the support portion along the width direction gradually decreases from the end portion in the circumferential direction of the elastic body toward the center. The bending resistance in the circumferential direction can be reduced.

The elastic crawler according to a fourth aspect of the present invention is the elastic crawler according to the first aspect, wherein the support portion has a height with respect to the bottom surface of the engaging recess on the top surface in the circumferential direction. The cross-sectional area along the width direction of the elastic body decreases while gradually decreasing from the portion toward the center.

  In the elastic crawler according to claim 4 of the present invention, the height of the support portion with respect to the bottom surface of the engagement concave portion of the top surface at the top surface where the bending stress (compression) is maximized is defined. Since the cross-sectional area along the elastic body width direction is reduced while gradually decreasing from the end portion in the elastic body circumferential direction toward the center, the bending resistance in the elastic body circumferential direction of the support portion can be further reduced.

  An elastic crawler according to a fifth aspect of the present invention is the elastic crawler according to any one of the first to fourth aspects, wherein the support portion supports a wheel on the top surface.

  In the elastic crawler according to claim 5 of the present invention, since the support portion supports the wheel at the top surface, it is necessary to form a dedicated portion where the wheel rolls on the inner peripheral portion of the endless belt-like elastic body. For example, a weight can be reduced compared with what forms the exclusive site | part in which a wheel rolls.

  As described above, the elastic crawler of the present invention can suppress an increase in circumferential bending resistance while suppressing noise and vibration during traveling.

1 is a perspective view including a partial cross section of an elastic crawler according to a first embodiment of the present invention. It is a top view which shows the inner peripheral part of the elastic crawler which concerns on 1st Embodiment of this invention. FIG. 3 is a cross-sectional view of the elastic crawler of FIG. 2 taken along line X1-X1. FIG. 3 is a cross-sectional view taken along line YY of the elastic crawler in FIG. 2 in a state where drive wheels are rolling. FIG. 3 is a cross-sectional view taken along line YY of the elastic crawler in FIG. 2 in a state where idle wheels and rolling wheels are rolling. It is an expansion perspective view of the support part of the elastic crawler concerning a 1st embodiment of the present invention. FIG. 3 is a cross-sectional view taken along line X2-X2 of the elastic crawler of FIG. 2 in a state of being wound around a drive wheel. It is the X1-X1 sectional view taken on the line of the elastic crawler of FIG. 2 in the state wound around the idler wheel. It is a top view which shows the inner peripheral part of the elastic crawler which concerns on 2nd Embodiment of this invention. It is an expansion perspective view of the support part of the elastic crawler which concerns on 2nd Embodiment of this invention. It is a top view which shows the inner peripheral part of the elastic crawler which concerns on 3rd Embodiment of this invention. It is the X1-X1 sectional view taken on the line of the elastic crawler of FIG. It is an expansion perspective view of the support part of the elastic crawler which concerns on 3rd Embodiment of this invention. It is the X1-X1 sectional view taken on the line of the elastic crawler of FIG. 11 in the state wound around the idler wheel. It is a sectional side view along the centerline which passes along the center of the crawler width direction of the elastic crawler which concerns on 4th Embodiment of this invention. It is an expansion perspective view of the support part of the elastic crawler which concerns on 4th Embodiment of this invention. It is a sectional side view along the central line which passes along the center of the crawler width direction of the elastic crawler which concerns on 5th Embodiment of this invention of the state which the rolling wheel is rolling on the top surface of a support part. It is the X2-X2 sectional view taken on the line of FIG. 2 of the state with which the elastic crawler provided with the modification of the metal core of 1st Embodiment of this invention was wound around the drive wheel.

(First embodiment)
Hereinafter, the elastic crawler according to the first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, an endless rubber crawler 10 as an example of an elastic crawler according to the first embodiment is a drive wheel 100 connected to a drive shaft of a crawler vehicle (for example, a combine or a tractor) as a machine body. An idler wheel 102 (see FIGS. 5 and 8) that is rotatably attached to the crawler wheel, and a plurality of rollers that are rotatably attached to the crawler wheel so as to be disposed between the drive wheel 100 and the idler wheel 102. It is used by being wound around a ring 104 (see FIG. 5).

In the present embodiment, the circumferential direction of the endless rubber crawler 10 (direction of arrow S in FIG. 2) is described as “crawler circumferential direction”, and the width direction of rubber crawler 10 (in the direction of arrow W in FIG. 2) is expressed as “crawler width”. "Direction". The crawler circumferential direction and the crawler width direction are orthogonal to each other when the rubber crawler 10 is viewed from the outer peripheral side or the inner peripheral side (see FIG. 2).
Further, in the present embodiment, the inner periphery side of the rubber crawler 10 (including an annular shape, an elliptical shape, a polygonal shape, etc.) wound around the driving wheel 100, the idler wheel 102, and the roller wheel 104 (including an annular shape, an elliptical shape, a polygonal shape) 3, the arrow IN direction side in FIG. 4 is referred to as “crawler inner peripheral side”, and the outer peripheral side of the rubber crawler 10 (arrow OUT direction side in FIGS. 3 and 4) is referred to as “crawler outer peripheral side”. 3 and 4, the arrow IN direction (annular inner direction) and the arrow OUT direction (annular outer direction) indicate the inner and outer directions of the rubber crawler 10 in the wound state.

  Moreover, the crawler traveling device 90 (refer FIG. 1) which concerns on 1st Embodiment as a driving | running | working part of a crawler vehicle is comprised by the driving wheel 100, the idler wheel 102, the wheel 104, and the rubber crawler 10 wound around these. The

  As shown in FIGS. 1 and 4, the drive wheel 100 includes a disc-shaped ring portion 100A connected to the drive shaft of the crawler wheel and both edges on the outer peripheral side of the ring portion 100A at regular intervals in the circumferential direction. And a pair of left and right tooth portions 100B that are provided and project outward in the radial direction. The driving wheel 100 causes the rubber crawler 10 to circulate between the driving wheel 100 and the idler wheel 102 by applying a driving force from the crawler wheel to the rubber crawler 10 (details will be described later).

  As shown in FIGS. 5 and 8, the idler wheel 102 has a disk shape and is rotatably attached to the crawler wheel. The idle wheel 102 is pressed in a direction away from the drive wheel 100 by a pressure mechanism such as hydraulic pressure (not shown) provided on the crawler vehicle side, and holds the tension (tension) of the rubber crawler 10.

  The wheel 104 supports the weight of the crawler wheel, a shaft portion (not shown) that is rotatably attached to the crawler wheel, and a disk-like shape that is provided at both ends of the shaft portion and has a larger diameter than the shaft portion. And a pair of ring portions 104A (see FIG. 5).

  The idler wheel 102 and the rolling wheel 104 are driven to rotate with respect to the rubber crawler 10 circulating between the drive wheel 100 and the idler wheel 102.

  As shown in FIG. 1, the rubber crawler 10 has a rubber body 12 in which a rubber material is formed in an endless belt shape. In addition, the rubber body 12 of this embodiment is an example of the elastic body of the present invention. In addition, the circumferential direction, the width direction, the inner circumferential side, and the outer circumferential side of the rubber body 12 of the present embodiment coincide with the crawler circumferential direction, the crawler width direction, the crawler inner circumferential side, and the crawler outer circumferential side, respectively.

  As shown in FIG. 2, a plurality of metal cores 20 made of a metal material are embedded in the rubber body 12 with an interval (a constant interval in this embodiment) in the crawler circumferential direction. As shown in FIGS. 2 and 4, the metal core 20 includes a pair of wing portions 24 that extend in the crawler width direction and extend outward from the both ends of the central portion 22 in the crawler width direction to the outside in the crawler width direction. Have. Further, the cored bar 20 has a cored bar projection 26 that protrudes from the root part of the wing part 24 (on the side of the central part 22 in the crawler width direction) toward the inner periphery of the crawler.

  As shown in FIG. 2, the cored bar 20 is arranged so that the center line CL passing through the center in the crawler width direction coincides with the center line passing through the center in the crawler width direction of the rubber body 12. In the present embodiment, the side facing the center line CL is described as the inner side in the crawler width direction, and the side away from the center line CL is described as the outer side in the crawler width direction.

  As shown in FIG. 3 and FIG. 4, on the inner peripheral side of the crawler of the central portion 22, it extends from the root portion of one core metal projection 26 toward the root portion of the other core metal projection 26, and both are connected and fixed. A reinforcing rib 23 for the ridge is provided. The reinforcing ribs 23 reinforce the bending rigidity of the pair of cored bar protrusions 26 in the crawler circumferential direction and the crawler width direction.

  Further, the top surface 23A (surface on the crawler inner peripheral side) of the reinforcing rib 23 is exposed from the rubber body 12 (see FIGS. 2 and 3).

  As shown in FIG. 7, the cored bar protrusion 26 is formed with a constricted portion 26 </ b> A at an intermediate portion from the tip portion to the root portion in a crawler side view (viewed from the crawler width direction). Further, as shown in FIG. 4, the core metal protrusion 26 protrudes from the inner peripheral portion 12A on the tip end side. A portion of the core metal protrusion 26 protruding from the inner peripheral portion 12A is covered with a rubber material similar to the rubber material constituting the rubber body 12, and a plurality of rubber protrusions 14 are formed on the inner peripheral portion 12A.

  As shown in FIG. 3, the rubber protrusion 14 has a substantially triangular shape when viewed from the side of the crawler, and the rubber thickness of the portion corresponding to the constricted portion 26A of the core metal protrusion 26 is thicker than the other portions. (See FIG. 7). In the present embodiment, the base side of the tooth portion 100B of the drive wheel 100 is brought into contact with the thick portion corresponding to the constricted portion 26A of the rubber protrusion 14.

  In this embodiment, as shown in FIGS. 4 to 7, the driving wheel 100 and the idler wheel 102 pass between the pair of rubber protrusions 14 while being guided by the rubber protrusions 14, and the pair of wheels of the rolling wheel 104. The portion 104A passes through the outer sides in the crawler width direction across the pair of rubber protrusions 14, respectively.

  As shown in FIGS. 2, 4, and 7, the pair of left and right tooth portions 100 </ b> B of the drive wheel 100 described above are inserted between the core bars 20 adjacent to each other in the crawler circumferential direction on the inner peripheral portion 12 </ b> A of the rubber body 12. A pair of engaging recesses 28 to be engaged are formed. Specifically, the engagement recess 28 is a recess which is formed between the rubber protrusions 14 adjacent to each other in the crawler circumferential direction and is recessed toward the outer periphery of the crawler. In the crawler side sectional view shown in FIG.

  Further, as shown in FIG. 7, the concave wall surface 28 </ b> A of the engaging recess 28 in the crawler circumferential direction is inclined so as to be continuous with the inclined wall surface 14 </ b> A of the rubber protrusion 14 in the crawler circumferential direction. With this configuration, the tooth portion 100B of the drive wheel 100 can be smoothly inserted into and removed from the engaging recess 28 during traveling.

  As shown in FIGS. 2 and 7, a lateral groove 29 extending in the crawler width direction is formed at a boundary portion between the concave wall surface 28 </ b> A and the concave bottom surface 28 </ b> B of the engagement concave portion 28. The lateral grooves 29 are substantially semicircular when viewed from the side of the crawler. The lateral groove 29 suppresses distortion at the boundary portion between the concave wall surface 28A and the concave bottom surface 28B, which is generated when the distal end side of the tooth portion 100B of the driving wheel 100 contacts the concave wall surface 28A and a driving force is input.

  As shown in FIG. 2, the inner peripheral portion 12 </ b> A of the rubber body 12 has a block-shaped support portion that protrudes between the core bars 20 adjacent in the crawler circumferential direction and between the pair of engaging recesses 28 on the inner peripheral side of the crawler. 30 is formed. The top surface 30A of the support portion 30 is located closer to the crawler inner periphery than the top surface 23A of the reinforcing rib 23 in the cross section along the crawler width direction shown in FIG.

  As shown in FIG. 8, the top surface 30A of the support portion 30 is in contact with the outer peripheral surface 102A of the idler wheel 102 to support the idler wheel 102, and is flat as shown in FIGS. Has been.

  In this embodiment, as shown in FIGS. 4 and 7, the top surface 30 </ b> A of the support portion 30 is in contact with the outer peripheral surface 100 </ b> C of the wheel portion 100 </ b> A of the drive wheel 100 to support the drive wheel 100. . At this time, the distal end portion (the distal end portion on the outer peripheral side) of the tooth portion 100B is separated (floating) from the concave bottom surface 28B of the engagement concave portion 28, but the present invention is not limited to this configuration, and the tooth portion The tip of 100B may be in contact with the bottom surface 28B of the engaging recess 28.

  In other embodiments according to the present invention, the tip portion of the tooth portion 100B contacts the concave bottom surface 28B of the engagement recess 28 to support the drive wheel 100, and instead the outer peripheral surface 100C of the ring portion 100A is the support portion. It is good also as a structure spaced apart (floating) from 30A top surfaces 30A.

  Further, the difference in height between the top surface 30A of the support portion 30 and the top surface 23A of the reinforcing rib 23 in the crawler inside / outside direction is such that the top surface 30A receives a load from the driving wheel 100 or the idle wheel 102 and the support portion 30 is compression elastic. Even when it is deformed, it is set so as not to become zero.

  As shown in FIG. 2, the length L <b> 1 in the crawler circumferential direction of the top surface 30 </ b> A is set to be larger than half of the arrangement interval (pitch) P of the cored bar 20. With this configuration, for example, the idler wheel 102 and the idler wheel 102 are adjacent to the crawler circumferential direction from the apex surface 30A of the support portion 30 as compared with the case where the length L1 of the apex surface 30A is set to half or less of the pitch P. When moving to the top surface 30 </ b> A of the matching support portion 30, the idle wheel 102 is prevented from dropping downward (on the crawler outer peripheral side), and the vertical movement of the drive wheel 100 and the idle wheel 102 is suppressed.

  As shown in FIG. 2 and FIG. 6, the support portion 30 has an end portion in the crawler circumferential direction of the top surface 30 </ b> A having a second moment of section with respect to the bending in the crawler circumferential direction when the rubber body 12 (rubber crawler 10) is wound. From 30B to the intermediate part (intermediate part between one end part 30B and the other end part 30B in the crawler circumferential direction) gradually decreases. Specifically, as shown in FIG. 6, the support portion 30 has a cross-sectional area that decreases while the width along the crawler width direction of the top surface 30A gradually decreases from the end portion 30B toward the center 30C. The secondary moment gradually decreases from the end portion 30B in the crawler circumferential direction toward the center 30C. In the present embodiment, the center 30C of the top surface 30A is represented by a straight line (dashed line) passing through the center in the crawler circumferential direction.

  Further, the support portion 30 has a constant width along the crawler width direction of the bottom portion 30D from the end portion 30B of the top surface 30A toward the center 30C, and the top surface 30A with reference to the concave bottom surface 28B of the engagement concave portion 28. The height H is constant. The bottom portion 30D of the support portion 30 is set at the same position as the concave bottom surface 28B of the engagement concave portion 28 (that is, a position where the height with respect to the concave bottom surface 28B becomes zero).

  More specifically, as shown in FIG. 6, the support portion 30 has a substantially trapezoidal cross-sectional shape along the crawler width direction. This support portion 30 has a cross-sectional shape K1 at the center 30C of the top surface 30A (two-dot chain line in FIG. 6) closer to the inner periphery of the crawler than a cross-sectional shape K2 near the end portion 30B (two-dot chain line in FIG. 6). The width of the side (top surface 30A) is shortened, and the area S1 of the cross-sectional shape K1 is smaller than the area S2 of the cross-sectional shape K2. With this configuration, the support section 30 has a cross-sectional secondary moment with respect to bending in the crawler circumferential direction in the wrapping state smaller in the section K1 than in the section K2.

  As shown in FIG. 2, the end portion 30E of the top surface 30A in the crawler width direction is a center (here, the center line CL) of the support portion 30 in the crawler width direction in a plan view (viewed from the inner side of the crawler). It is curved to be convex toward As a result, local stress concentration on the end portion 30E when the support portion 30 is wound around the drive wheel 100 or the idler wheel 102 and bent is alleviated. In other embodiments according to the present invention, the end 30E may have a V shape, a step shape, a wave shape, or the like that is convex toward the center line CL in plan view.

  Further, when the width along the crawler width direction at the center 30C of the top surface 30A is W1, and the width along the crawler width direction at the end portion 30B is W2, the width W1 is in the range of 50 to 99% of the width W2. It is said to be inside.

  As shown in FIG. 2, in the present embodiment, the center 30C of the top surface 30A and the straight line SL passing through the center between the core bars 20 adjacent in the crawler circumferential direction coincide with each other. In other embodiments according to the present invention, the center 30C and the straight line SL may be shifted in the crawler circumferential direction.

  As shown in FIGS. 2 and 4, the inner peripheral portion 12 </ b> A of the rubber body 12 is formed with a roller support portion 36 that protrudes on the inner peripheral side of the crawler on both sides in the crawler width direction with the pair of rubber protrusions 14 interposed therebetween. ing. The roller support portion 36 is continuous along the crawler circumferential direction, the top surface 36A is flat, and contacts the outer peripheral surface 104B of the wheel portion 104A of the roller wheel 104 to support the roller wheel 104. Is.

  As shown in FIG. 4, in this embodiment, the rubber protrusion 14 protrudes from the inner peripheral portion 12A to the crawler inner peripheral side with the inner peripheral portion 12A as a reference, and the support portion 30 protrudes toward the crawler inner peripheral side. The engaging recess 28 is recessed toward the outer periphery of the crawler.

  As shown in FIGS. 3 and 4, an endless belt-like reinforcing layer 18 extending in the crawler circumferential direction is embedded in the rubber body 12 on the crawler outer circumferential side of the core metal 20. The reinforcing layer 18 is formed by rubber-covering one reinforcing cord wound spirally along the crawler circumferential direction or a plurality of reinforcing cords arranged in parallel along the crawler circumferential direction. In the present embodiment, a steel cord having excellent tensile strength is used as a reinforcing cord. However, the present invention is not limited to this configuration, and may be composed of, for example, organic fiber as long as it has sufficient tensile strength. A cord may be used as a reinforcing cord.

As shown in FIGS. 1 and 3, a pair of block-like long lugs 16 </ b> A are formed on the outer peripheral portion of the rubber body 12 in the crawler width direction with the center line CL interposed therebetween. ing.
Also, a pair of block-like short lugs 16 </ b> B that protrude on the outer periphery of the crawler and extend in the crawler width direction are formed on the outer periphery of the rubber body 12 in the crawler width direction with the center line CL interposed therebetween.
The pair of long lugs 16A and the pair of short lugs 16B are alternately formed with an interval (here, a constant interval) in the crawler circumferential direction.

  The end portions of the long lugs 16A on the outer side in the crawler width direction reach the end portions 12B in the crawler width direction of the rubber body 12, respectively. On the other hand, the short lug 16B is shorter in the crawler width direction than the long lug 16A, and the end on the outer side in the crawler width direction is located on the inner side in the crawler width than the end 12B of the rubber body 12.

  As shown in FIG. 3, the pair of long lugs 16 </ b> A and the pair of short lugs 16 </ b> B are disposed between the core bars 20 adjacent to each other in the crawler circumferential direction. Specifically, it is disposed on the crawler outer peripheral side of the support portion 30 in a side view of the crawler (see FIG. 3). The long lugs 16A and the short lugs 16B support the weight of the vehicle and exert the traction force of the rubber crawler 10.

Next, the effect of the rubber crawler 10 of this embodiment is demonstrated.
In the rubber crawler 10, when the driving wheel 100 rotates in a state where the pair of left and right teeth 100B of the driving wheel 100 are inserted and engaged with the engaging recess 28, the driving force is transmitted to the rubber crawler 10 (rubber body 12). . Thereby, the rubber crawler 10 circulates between the driving wheel 100 and the idler wheel 102, and the crawler vehicle including the crawler traveling device 90 moves on the ground. At this time, as shown in FIG. 8, the idler wheel 102 sequentially transfers from the top surface 30 </ b> A of the support portion 30 to the top surface 30 </ b> A of the support portion 30 adjacent in the crawler circumferential direction, and the top surface 30 </ b> A of each support portion 30. Roll over. Similarly, as shown in FIG. 7, the drive wheel 100 also sequentially transfers from the top surface 30A of the support portion 30 to the top surface 30A of the support portion 30 adjacent in the crawler circumferential direction, and the top surface 30A of each support portion 30. Roll over.

  Here, in the rubber crawler 10, the support portion 30 that protrudes from the inner peripheral portion 12 </ b> A toward the inner peripheral side of the crawler and supports the idler wheel 102 at the top surface 30 </ b> A is formed. When the idler wheel 102 is transferred from the top surface 30A of the support part 30 to the top surface 30A of the support part 30 adjacent in the crawler circumferential direction, the idler wheel 102 and the core metal 20 (in detail) Can avoid the collision with the top surface 23A) of the reinforcing rib 23, or can soften (buffer) the collision between the idler wheel 102 and the cored bar 20. Note that when the collision between the idler wheel 102 and the cored bar 20 is avoided, the collision sound and the vibration caused by the collision do not occur. Further, as described above, by avoiding or mitigating (buffering) the collision between the idler wheel 102 and the cored bar 20, peeling between the cored bar 20 and its surrounding rubber caused by repeated collisions can be suppressed. . Further, the collision between the drive wheel 100 and the cored bar 20 (specifically, the top surface 23A of the reinforcing rib 23) can be avoided or the collision between the drive wheel 100 and the cored bar 20 can be reduced (buffered). Further, it is possible to suppress peeling between the cored bar 20 and the surrounding rubber due to repeated collisions. Thereby, noise and vibration during traveling are suppressed.

  The collision between the driving wheel 100 and the idler wheel 102 and the cored bar 20 mentioned here includes a direct or indirect collision, and the indirect collision is caused by a rubber covering the cored bar 20. This means that the core metal 20 collides with the driving wheel 100 and the idler wheel 102.

  On the other hand, in the rubber crawler 10, the second moment of section of the support portion 30 with respect to the bending in the crawler circumferential direction when the rubber body 12 is wound is gradually increased from the end portion 30B of the top surface 30A to the intermediate portion (here, the center 30C). Since it is small, for example, the cross section secondary moment of the support section 30 is increased from the end 30B to the center 30C, or compared with the support section 30 having a constant cross section secondary moment. Bending resistance in the crawler circumferential direction is reduced. Thereby, when the rubber crawler 10 is wound around the driving wheel 100 and the idler wheel 102 with an increase in bending resistance in the circumferential direction of the elastic body, it is easy to bend along these outer peripheral surfaces 100C and 102A.

  Here, the bending resistance in the crawler circumferential direction is the bending when the rubber crawler 10 is wound around the driving wheel 100 and the idler wheel 102 and is bent along the outer periphery of each of the driving wheel 100 and the idler wheel 102. It refers to resistance to deformation, that is, resistance to bending deformation in the crawler circumferential direction when the rubber body 12 is wound.

  From the above, according to the rubber crawler 10, it is possible to suppress an increase in bending resistance in the crawler circumferential direction while suppressing noise and vibration during traveling.

  Further, in the rubber crawler 10, the width along the crawler width direction of the top surface 30A on the top surface 30A where the bending stress (compression) is maximized is gradually decreased from the end 30B of the top surface 30A toward the center 30C. However, since the cross-sectional area along the crawler width direction of the support portion 30 is reduced, the bending resistance of the support portion 30 in the crawler circumferential direction can be reduced.

  As described above, the support portion 30 generates heat because the cross-sectional area along the crawler width direction decreases from the end portion 30B of the top surface 30A toward the center 30C, that is, the amount of rubber decreases. The amount decreases. In particular, since the amount of rubber in the vicinity of the center 30C, which is a portion that bends mainly in the bending deformation in the crawler circumferential direction, is reduced, the heat generation amount of the support portion 30 can be reduced. From the above, the support portion 30 is suppressed from rubber thermal degradation due to bending in the crawler circumferential direction, and defects caused by the thermal degradation (for example, occurrence of cracks) are suppressed. Thereby, the durability of the rubber crawler 10 is improved.

  Further, when the width W1 along the crawler width direction at the center 30C of the top surface 30A is less than 50% of the width W2 along the crawler width direction at the end portion 30B, the support portion 30 is near the center 30C. Since the surface pressure received from the idler wheel 102 and the drive wheel 100 increases at this time, there is a possibility that the progress of wear near the center 30C may be accelerated, and when the width W1 exceeds 99% of the width W2, The effect of reducing the bending resistance in the crawler circumferential direction cannot be sufficiently obtained. For this reason, in the rubber crawler 10, the width W1 is set within a range of 50 to 99% of the width W2, and the effect of suppressing the local wear of the support portion 30 and the bending resistance of the support portion 30 in the crawler circumferential direction are reduced. The effect of decreasing is compatible.

  When the rubber crawler 10 is wound around the driving wheel 100 and the idler wheel 102 and is bent along the outer periphery of each of the driving wheel 100 and the idler wheel 102, a straight line SL passing through the center between the adjacent core bars 20 in the crawler circumferential direction. Bending stress concentrates on the top. For this reason, in the rubber crawler 10, the center 30C of the top surface 30A of the support part 30 and the straight line SL passing through the center between the core bars 20 adjacent in the crawler circumferential direction are matched. Thereby, the increase in the bending resistance of the rubber crawler 10 in the crawler circumferential direction can be further suppressed.

  Further, in the rubber crawler 10, even if a foreign matter (for example, pebbles) entering the top surface 30 </ b> A of the support portion 30 is stepped on the driving wheel 100 or the idler wheel 102, the lower side (crawler outer peripheral side) of the support portion 30. In addition, since a rigid body such as the cored bar 20 is not disposed, the rubber or the like that constitutes the support portion 30 is elastically deformed, and the malfunction (damage or the like) of the top surface 30A is suppressed. Thereby, the progress of a crack by damage to the support part 30 of the rubber crawler 10, a rubber | gum chip, etc. can be suppressed effectively.

  Furthermore, in the rubber crawler 10, since the top surface 30A of the support portion 30 is flat, the idler wheel 102 is transferred from the top surface 30A of the support portion 30 to the top surface 30A of the support portion 30 adjacent in the crawler circumferential direction. At this time, it is possible to suppress the chipping (rubber chipping) of the end 30B and its periphery due to the collision between the end 30B and its periphery of the top surface 30A and the idler wheel 102. Thereby, durability of the support part 30, ie, durability of the rubber crawler 10, is improved.

  In the crawler traveling device 90 using the rubber crawler 10 in which the increase in the bending resistance in the crawler circumferential direction is suppressed as described above, power loss when the rubber crawler 10 (rubber body 12) is wound around the drive wheel 100 or the like is reduced. Can improve the fuel efficiency of crawler cars. In addition, the work when the rubber crawler 10 is wound around the drive wheel 100, the idler wheel 102, and the roller wheel 104 is facilitated. Furthermore, acceleration performance can be improved.

  Further, in the rubber crawler 10, since the tooth portion 100B of the drive wheel 100 is inserted into and engaged with the engagement recess 28, for example, the teeth of the drive wheel 100 are compared with those in which the tooth portion 100B engages with the rubber protrusion 14. The position where the driving force is input from the portion 100B is the crawler outer peripheral side (the base side of the cored bar projection 26 as shown in FIG. 6), and the tilting movement of the cored bar 20 in the rubber body 12 is suppressed. As described above, the inclination movement of the cored bar 20 in the rubber body 12 is suppressed, so that the deformation of the rubber around the cored bar 20 is also reduced. As a result, the fatigue of the rubber around the cored bar 20 is reduced, and a decrease in the durability of adhesion between the cored bar 20 and the rubber around the cored bar 20 is suppressed. In addition, the inclination of the cored bar 20 here refers to the inclination of the crawler circumferential direction in a crawler side view (FIG. 3 etc.).

  Further, for example, when the long lugs 16A and the short lugs 16B are alternately formed in the crawler circumferential direction on the crawler outer circumferential side of the core metal 20 arranged at intervals in the crawler circumferential direction, the driving wheel 100 is formed on the top surface 30A. Further, when the idle wheel 102 rolls, the top surface 30A of the support portion 30 is lowered by the load from the drive wheel 100 and the idle wheel 102, and there is a possibility that vibration during running increases. For this reason, in the rubber crawler 10, the crawlers on the top surface 30 </ b> A of the support portion 30 formed at intervals in the crawler circumferential direction without forming the long lugs 16 </ b> A and the short lugs 16 </ b> B on the crawler outer peripheral side of the cored bar 20. Long lugs 16A and short lugs 16B are alternately formed on the outer peripheral side in the crawler circumferential direction. Thereby, since the thickness of the rubber material at the position of the support portion 30 (particularly the top surface 30A) is increased, the top surface 30A is suppressed from being lowered by the load from the driving wheel 100 and the idle wheel 102. That is, since the spring in the vertical direction of the rubber crawler 10 (inside and outside of the crawler) is uniform in the crawler circumferential direction, vertical movement (vibration) of the wheel 104 and the like is suppressed, vibration during running is suppressed, and stability is also improved. improves.

  In the first embodiment, the top surface 30A of the support portion 30 is flat when viewed from the side of the crawler. However, the present invention is not limited to this configuration, and the top surface 30A of the support portion 30 when viewed from the side of the crawler. A configuration other than a flat shape may be used. For example, the top surface 30 </ b> A may have a shape (for example, a taper shape) in which the end portion 30 </ b> B in the crawler circumferential direction rises to the crawler inner circumferential side from an intermediate portion (for example, a central portion) in the crawler circumferential direction. In this case, for example, the contact pressure between the top surface 30A of the support portion 30 and the idler wheel 102 is increased as compared with a flat top surface 30A in a side view of the crawler, and the surface pressure acting on the top surface 30A is increased. Can be reduced. Thereby, abrasion of the support part 30 is reduced, and durability of the support part 30, that is, durability of the rubber crawler 10 is improved. Note that the shape of the top surface 30 </ b> A in the crawler side view so that the end 30 </ b> B swells from the center side in the crawler circumferential direction to the crawler inner circumferential side may be applied to a rubber crawler of the second embodiment described later. Good.

  Moreover, in the cored bar 20 of 1st Embodiment, as shown in FIG. 3, the shape of the cored bar | burr protrusion 26 is made into the shape by which the constriction part 26A is formed in the intermediate part from a front-end | tip part to a root part in the crawler side view. However, the present invention is not limited to this configuration, and the shape of the cored bar protrusion 26 may be a shape in which the constricted portion 26A is not formed in the intermediate portion from the tip portion to the root portion in a crawler side view. For example, like a cored bar 86 shown in FIG. 18 which is a modified example of the cored bar 20, the shape of the cored bar projection 88 is gradually increased from the tip toward the root side in the crawler side view. It is good also as a shape (it is made into the substantially triangular shape as an example in FIG. 15). The core metal protrusion 88 protrudes in the crawler circumferential direction with respect to the wing portion 24 on the protrusion base side. As described above, in the metal core 86, the shape of the metal core protrusion 88 is a shape in which the length in the crawler circumferential direction gradually increases from the tip portion toward the base side in a side view of the crawler, that is, the constricted portion 26A is formed. Since the shape (configuration) is not set, the rigidity (such as bending rigidity) of the cored bar protrusion 88 can be improved. In addition, you may use the metal core 86 as a metal core of each rubber crawler of 2nd-5th embodiment mentioned later.

(Second Embodiment)
Next, an elastic crawler according to a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIGS. 9 and 10, the rubber crawler 50 of the present embodiment has the same configuration as the rubber crawler 10 of the first embodiment except for the configuration of the support portion 52. For this reason, below, the structure of the support part 52 is demonstrated.

  The support portion 52 has a width along the crawler width direction of the bottom portion 52D, similar to the width along the crawler width direction of the top surface 52A, from the end portion 52B in the crawler circumferential direction of the top surface 52A to the center 52C in the crawler circumferential direction. While the cross-sectional area decreases while gradually decreasing, the other configuration is substantially the same as the support portion 30 of the first embodiment. Note that the end 52E of the top surface 52A in the crawler width direction corresponds to the end 30E of the top surface 30A of the first embodiment. In the present embodiment, the center 52C of the top surface 52A is represented by a straight line (dashed line) passing through the center in the crawler circumferential direction.

Next, the effect of the rubber crawler 50 of 2nd Embodiment is demonstrated.
In addition, the description about the effect similar to 1st Embodiment among the effects of this embodiment is abbreviate | omitted.

  In the rubber crawler 50 of this embodiment, the cross-sectional area is reduced while gradually decreasing the width along the crawler width direction of the bottom 52D of the support portion 52 from the end 52B toward the center 52C. The bending resistance in the crawler circumferential direction of the support portion 52 can be reduced as compared with the support portion 30 of the rubber crawler 10 in the form. Moreover, since the rubber amount of the support part 52 is smaller than the support part 30 of 1st Embodiment, the emitted-heat amount also falls.

(Third embodiment)
Next, an elastic crawler according to a third embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIGS. 11 and 12, the rubber crawler 60 of the present embodiment has the same configuration as the rubber crawler 10 of the first embodiment except for the configuration of the support portion 62. For this reason, below, the structure of the support part 62 is demonstrated in detail.

  As shown in FIGS. 12 and 14, the support portion 62 has an end portion in the crawler circumferential direction of the top surface 62 </ b> A having a second moment of section with respect to the bending in the crawler circumferential direction when the rubber body 12 (rubber crawler 10) is wound. It gradually decreases from 62B to the center 62C. Specifically, as shown in FIG. 12, the support portion 62 has a height that gradually decreases from the end 62B of the top surface 62A toward the center 62C with respect to the concave bottom surface 28B of the engaging recess 28 of the top surface 62A. However, the cross-sectional area along the crawler width direction decreases, and the cross-sectional secondary moment gradually decreases from the end 62B in the crawler circumferential direction toward the center 62C. In the present embodiment, the center 62C of the top surface 62A is represented by a straight line (dashed line) passing through the center in the crawler circumferential direction.

  The support portion 62 has a width W along the crawler width direction of the top surface 62A that is constant from the end 62B of the top surface 62A toward the center 62C, and a width W along the crawler width direction of the bottom portion 62D. It is constant from the end 62B of the top surface 62A toward the center 62C. The bottom portion 62D of the support portion 62 is at the same position as the concave bottom surface 28B of the engagement concave portion 28 (that is, a position where the height with respect to the concave bottom surface 28B becomes zero).

  More specifically, as shown in FIG. 13, the support portion 62 has a substantially trapezoidal cross-sectional shape along the crawler width direction. The support portion 62 has a lower cross-sectional shape K1 (two-dot chain line in FIG. 13) at the center 62C of the top surface 62A than the cross-sectional shape K2 (two-dot chain line in FIG. 13) in the vicinity of the end portion 62B. The area S1 of the cross-sectional shape K1 is smaller than the area S2 of the cross-sectional shape K2. With this configuration, in the support portion 62, the second moment of section with respect to the crawler circumferential bending in the winding state is smaller in the section K1 than in the section K2.

  As shown in FIG. 12, the top surface 62 </ b> A has a V-shape with the lowest height at the center 62 </ b> C in a crawler side view. In other embodiments according to the present invention, the top surface 62A may be curved so as to be convex toward the outer periphery of the crawler. Further, an arbitrary portion (intermediate portion) between both end portions 62B excluding the center 62C of the top surface 62A may have a V shape or a curved shape having the lowest height.

  When the height with respect to the concave bottom surface 28B at the center 62C of the top surface 62A is H1, and the height with respect to the concave bottom surface 28B at the end 62B is H2, 0 <(H2-H1) / P <0.15 is satisfied.

  As shown in FIG. 11, in the present embodiment, the center 62C of the top surface 62A and the straight line SL passing through the center between the core bars 20 adjacent to each other in the crawler circumferential direction coincide with each other. In other embodiments according to the present invention, the center 62C and the straight line SL may be shifted in the crawler circumferential direction.

Next, the effect of the rubber crawler 60 of 3rd Embodiment is demonstrated.
In addition, the description about the effect similar to 1st Embodiment among the effects of this embodiment is abbreviate | omitted.

  In the rubber crawler 60 of the third embodiment, the height of the top surface 62A where the bending stress (compression) is maximized with reference to the concave bottom surface 28B of the engagement concave portion 28 of the top surface 62A is the crawler of the top surface 62A. Since the cross-sectional area along the crawler width direction of the support portion 62 is decreased while gradually decreasing from the circumferential end portion 62B toward the center 62C, the bending resistance of the support portion 62 in the crawler circumferential direction is further reduced. Can do.

  In particular, as shown in FIG. 12, the top surface 62A is V-shaped in a cross-sectional view of the crawler, and therefore, for example, the area of the top surface 62A is larger than that of a straight (flat) top surface. Widely, the heat of the support portion 62 that generates heat by bending deformation can be efficiently radiated.

  When the height based on the concave bottom surface 28B at the center 62C of the top surface 62A is H1, and the height based on the concave bottom surface 28B at the end 62B is H2, 0 <(H2-H1) / The relationship of P <0.15 is satisfied. In the case of (H2−H1) / P <0, the contact between the top surface 62A and the idler wheel 102 or the drive wheel 100 becomes local, and the surface pressure increases, so that the top surface 62A is locally worn. If (H2−H1) /P≧0.15 is exceeded, the effect of reducing the bending resistance of the support portion 62 in the crawler circumferential direction cannot be sufficiently obtained. For this reason, in the rubber crawler 10, by satisfying the relationship of 0 <(H2−H1) / P <0.15, the effect of suppressing the local wear of the support portion 62 and the crawler circumference of the support portion 62 are reduced. It has the effect of reducing the bending resistance in the direction.

  Further, in the rubber crawler 60, the center 62C of the top surface 62A of the support portion 62 and the straight line SL passing through the center between the core bars 20 adjacent in the crawler circumferential direction are matched. Thereby, the increase in bending resistance in the crawler circumferential direction can be further suppressed.

  In addition, the structure of the support part 30 of 1st Embodiment and the support part 52 of 2nd Embodiment is applied to the support part 62 of the rubber crawler 60 of this embodiment, for example, the support part 62 is made into the top surface 62A. The cross-sectional area may be reduced while the width along the crawler width direction and the height based on the concave bottom surface 28B of the engaging concave portion 28 are gradually reduced from the end 62B toward the center 62C.

(Fourth embodiment)
Next, the elastic crawler of 4th Embodiment which concerns on this invention is demonstrated, referring FIG. 15, FIG. In addition, the same code | symbol is attached | subjected to the same structure as 2nd Embodiment, and the description is abbreviate | omitted.

  As shown in FIGS. 15 and 16, the rubber crawler 70 of this embodiment has the same configuration as the rubber crawler 60 of the third embodiment except for the configuration of the support portion 72. For this reason, below, the structure of the support part 72 is demonstrated in detail.

  The support 72 is curved so that the top surface 72A is convex toward the outer periphery of the crawler when viewed from the side of the crawler, and the radius of curvature of this curve is set to be equal to or larger than the radius r of the idler wheel 102. The configuration is almost the same as that of the support portion 62 of the third embodiment. That is, the support portion 72 has a cross-sectional area that is gradually reduced from the end portion 72B in the crawler circumferential direction toward the center 72C with respect to the concave bottom surface 28B of the engaging concave portion 28 of the top surface 72A. In the present embodiment, the center 72C of the top surface 72A is represented by a straight line (one-dot chain line) passing through the center in the crawler circumferential direction.

Next, the effect of the rubber crawler 70 of 4th Embodiment is demonstrated.
In addition, the description about the effect similar to 3rd Embodiment among the effects of this embodiment is abbreviate | omitted.

  Since the radius of curvature of the top surface 72A is set to be equal to or larger than the radius of the idler wheel 102, the support portion 72 can increase the contact area when the idler wheel 102 rolls on the top surface 72A. . Thereby, the contact surface pressure of 72 A of top surfaces is reduced, and progress of wear of 72 A of top surfaces is suppressed. As a result, the durability of the support portion 72, that is, the durability of the rubber crawler 70 is improved.

  In addition, the support part 72 of the present embodiment has an arc shape around the end 72B of the top surface 72A. Thereby, the up-and-down movement at the time of the idle wheel 102 and the drive wheel 100 transferring from the top surface 72A to the top surface 72A adjacent in the crawler circumferential direction can be suppressed. Further, the progress of wear around the end portion 72B can be suppressed.

  In addition, the structure of the support part 30 of 1st Embodiment and the support part 52 of 2nd Embodiment is applied to the support part 72 of the rubber crawler 70 of this embodiment, for example, the support part 72 is made into the top surface 72A. The cross-sectional area may be reduced while the width along the crawler width direction and the height based on the concave bottom surface 28B of the engaging concave portion 28 are gradually reduced from the end 72B toward the center 72C.

(Fifth embodiment)
Next, an elastic crawler according to a fifth embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment, and the description is abbreviate | omitted.

  The rubber crawler 80 according to the fifth embodiment is wound around the drive wheel 100, the idler wheel 102, and the roller wheel 105. The wheel 105 is formed in a disk shape and is rotatably attached to the crawler wheel, passes between the pair of rubber protrusions 14 of the rubber crawler 80, and is supported by the top surface 30A of the support portion 30 so that the top surface 30A. It is designed to roll up. For this reason, in the rubber crawler 80, the wheel support portions 36 are not formed on both outer sides in the crawler width direction with the pair of engaging recesses 28 interposed therebetween. The other configuration of the rubber crawler 80 is the same as that of the rubber crawler 10 of the first embodiment.

Next, the effect of the rubber crawler 80 of 5th Embodiment is demonstrated.
In addition, the description about the effect similar to 1st Embodiment among the effects of this embodiment is abbreviate | omitted.

  As the rubber crawler 80 travels, as shown in FIG. 17, the rolling wheels 105 are sequentially transferred from the top surface 30 </ b> A of the support unit 30 to the top surface 30 </ b> A of the support unit 30 adjacent in the crawler circumferential direction. Roll on the top surface 30A. For this reason, when the roller 105 is transferred from the top surface 30A of the support part 30 to the top surface 30A of the support part 30 adjacent in the crawler circumferential direction, the wheel 105 and the core metal 20 (specifically, the reinforcing rib 23 The collision with the top surface 23A) can be avoided, or the collision between the rolling wheel 105 and the cored bar 20 can be reduced (buffered). In addition, when the collision between the wheel 105 and the cored bar 20 is avoided, the collision sound and the vibration due to the collision do not occur. Further, as described above, by avoiding or mitigating (buffering) the collision between the rolling wheel 105 and the cored bar 20, peeling between the cored bar 20 and the surrounding rubber due to repeated collisions can be suppressed. . Thereby, noise and vibration during traveling are further suppressed.

  Note that the collision between the wheel 105 and the cored bar 20 mentioned here includes a direct or indirect collision, and the indirect collision refers to the cored bar via rubber covering the cored bar 20. This means that 20 and the roller 105 collide.

  Further, in the rubber crawler 80, as described above, since the wheel 105 rolls on the top surface 30 </ b> A of the support portion 30, the rubber crawler 80 rolls outward in the crawler width direction across the pair of engagement recesses 28. The ring support portion 36 is not formed. For this reason, the rubber crawler 80 can reduce the weight as compared with, for example, those in which the wheel support portions 36 are formed on both outer sides in the crawler width direction of the pair of cored bar projections 26, and further, the crawler circumferential direction The bending rigidity of can be reduced.

  In addition, the structure which does not form the wheel support part 36 using the roller 105 of the rubber crawler 80 of 5th Embodiment is applicable also to any rubber crawler of 2nd-4th embodiment.

(Other embodiments)
In the rubber crawler 10 of the first embodiment, the long lugs 16 </ b> A and the short lugs 16 </ b> B are alternately formed in the crawler circumferential direction on the crawler outer circumferential side of the support part 30 formed at intervals in the crawler circumferential direction. The present invention is not limited to this configuration, and the long lugs 16A and the short lugs 16B are alternately arranged in the crawler circumferential direction on the crawler outer circumferential side of the cored bar 20 arranged at intervals in the crawler circumferential direction. It is good. With this configuration, the thickness of the rubber part on the lower side (crawler outer peripheral side) of the cored bar 20 is greatly increased by the long lug 16A or the short lug 16B. Even if it is stepped on, the obstacle does not reach the reinforcing layer 18, that is, damage to the reinforcing layer 18 can be effectively prevented. On the other hand, when an obstacle is stepped on a portion without the long lugs 16A and the short lugs 16B, that is, the lower rubber portion of the support portion 30, the lower rubber portion is deformed so as to be recessed toward the inner peripheral side of the crawler. Because of the (elastic deformation), it is difficult for the obstacle to bite, and damage due to the obstacle can be prevented to some extent. In addition, the positional relationship of the long lugs 16A and the short lugs 16B with respect to the cored bar 20 when viewed from the crawler outer peripheral side is determined according to the specifications of the rubber crawler. In addition, the lug arrangement pattern in which the long lugs 16A and the short lugs 16B are alternately arranged in the crawler circumferential direction on the crawler outer circumference side of the cored bar 20 arranged at intervals in the crawler circumferential direction is the second to fifth. It can be applied to any rubber crawler of the embodiment.

  In the above-described embodiment, the center line of the rubber body 12 and the center line CL of the core metal 20 are made to coincide with each other. However, the present invention is not limited to this configuration, and the core metal with respect to the center line of the rubber body 12 is used. The 20 center lines CL may be shifted in the crawler width direction.

  In the above-described embodiment, the reinforcing layer 18 is embedded for reinforcing the tensile stress of the rubber crawler 10. However, the present invention is not limited to this configuration, and the reinforcing layer 18 is not used, and the crawler circumferential direction is not used. The cores 20 adjacent to each other are connected with a connecting member (for example, a ring-shaped connecting member), or the connecting parts formed on the core metal (for example, a hook and a pin) are connected to form an endless core. It is good also as a structure which reinforces the tensile stress of the rubber crawler 10 with a gold | metal coupling body.

  Furthermore, in the embodiment described above, the rubber body 12 is formed of a rubber material as an example of an elastic body, but the present invention is not limited to this configuration, and an elastomer other than a rubber material is used as an example of an elastic body. May be.

  Furthermore, in the above-described embodiment, the cored bar 20 is made of metal. However, the present invention is not limited to this configuration, and the cored bar 20 may be, for example, provided with sufficient strength with respect to the specifications of the rubber crawler 10. It may be made of resin.

  The embodiments of the present invention have been described above with reference to the embodiments. However, these embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. It goes without saying that the scope of rights of the present invention is not limited to these embodiments.

10, 50, 60, 70, 80 Rubber crawler (elastic crawler)
12 Rubber body (elastic body)
12A Inner peripheral part 20 Core metal 28 Engagement recessed part 30, 52, 62, 72 Support part 30A, 52A, 62A, 72A Top surface 30B, 52B, 62B, 72B End part (end part of crawler width direction of top surface)
100 Driving wheel 100B Tooth part 102 Idle ring CL Center line SL Straight line H1 Top surface height (end part)
H2 Top surface height (center)
W1 Top width (end)
W2 Top width (center)
S Crawler circumferential direction (circumferential direction of elastic body)
W Crawler width direction (elastic body width direction)
IN crawler inner circumference side (inner circumference side of elastic body)
OUT crawler outer circumference (outer circumference of elastic body)

Claims (5)

An endless belt-like elastic body wound around a drive wheel and an idle wheel;
A plurality of cored bars embedded in the elastic body at intervals in the circumferential direction of the elastic body;
A pair of engaging recesses formed between the core bars adjacent to each other in the circumferential direction of the inner peripheral portion of the elastic body and into which a pair of left and right tooth portions provided on the drive wheel are respectively inserted and engaged;
Formed between the core bars adjacent to each other in the circumferential direction of the inner peripheral portion and between the pair of engaging recesses, bulges on the inner peripheral side of the elastic body, supports the idler wheel on the top surface, A support portion in which a second moment of section with respect to the bending in the circumferential direction in the state where the elastic body is wound is gradually reduced from an end portion in the circumferential direction to an intermediate portion;
Elastic crawler with. 2. The cross-sectional area along the width direction of the support portion decreases along a width of the top surface along the width direction of the elastic body gradually decreasing from an end portion in the circumferential direction toward the center. Elastic crawler as described in. 2. The elastic crawler according to claim 1, wherein a width of the support portion along a width direction of the elastic body at the bottom portion of the support portion gradually decreases from an end portion in the circumferential direction toward the center. The support portion has a cross-sectional area along the width direction of the elastic body that decreases gradually from the circumferential end toward the center with respect to the bottom surface of the engagement recess on the top surface. The elastic crawler according to claim 1.   The elastic crawler according to any one of claims 1 to 4, wherein the support portion supports a wheel at the top surface.

Images