JP5784320B2 - Crawler mandrel and elastic crawler - Google Patents

Description

  The present invention relates to a core metal for a crawler and an elastic crawler using the same.

  From the viewpoints of road surface protection, noise suppression, and environmental protection, in recent years, rubber crawlers have been widely used in traveling parts of vehicles such as agricultural machines, construction machines, and civil engineering machines. . Among such rubber crawlers, there is one in which driving force is transmitted by engaging sprocket teeth with rubber protrusions formed on the inner peripheral surface at regular intervals in the circumferential direction (for example, Patent Documents). 1).

JP 2010-13064 A

By the way, in the rubber crawler of patent document 1, a pair of drive pins provided upright on both side surfaces of the sprocket are in contact with and pressed against the pair of rubber protrusions, so that the driving force is transmitted. When the rubber protrusion is pressed by the drive pin in this way, a force in the direction of tilting the corner acts on the protrusion of the cored bar in the rubber protrusion. During traveling, a force in the direction of tilting the protrusion is repeatedly input to the protrusion of the metal core, so that a problem such as bending of the protrusion may occur.
In particular, in Patent Document 1, since the protrusion of the cored bar is bundled at the middle part, the cored bar tends to be easily deformed such that the projection is bent from the bent part by repeated input during traveling.

  An object of the present invention is to provide a crawler core bar in which deformation of a protrusion due to input from a drive wheel is suppressed, and an elastic crawler using the crawler core bar.

A first aspect of the present invention is a crawler cored bar embedded in an endless elastic crawler wound around a drive wheel at intervals in the crawler circumferential direction, and a plate-shaped cored bar body extending in the crawler width direction; A pair of core metal bodies are formed at intervals in the crawler width direction, project toward the inner peripheral side of the crawler, and both wall portions in the crawler circumferential direction have a length in the crawler circumferential direction from the tip of the projection toward the core metal main body. Inclined with respect to the protruding direction so as to gradually increase and project from the core metal body, and the end of the wall portion is at the same position as the crawler inner peripheral surface of the core metal body or on the crawler outer peripheral side than the surface And a protrusion for receiving a driving force from the driving wheel on the wall portion .

The protrusions of claim 1 are projected from the core metal body so that both wall portions in the crawler circumferential direction are inclined with respect to the projecting direction so that the length in the crawler circumferential direction gradually increases from the tip of the protrusion toward the core metal body. Yes. Further, the end portion of the wall portion is located at the same position as the crawler inner peripheral surface of the core metal body or at the crawler outer peripheral side from the surface. That is, the crawler circumferential wall portion of the projection is continuously inclined from the tip of the projection to at least the surface of the core metal body, and the crawler circumferential direction constricted portion is not formed in the middle.
For this reason, the protrusions have improved crawler circumferential rigidity (bending rigidity or shear rigidity), for example, as compared with the protrusions having a crawler circumferential direction constriction.
Thereby, even if the crawler circumferential direction input (for example, input from the drive wheel) acts on the projection, for example, the bending deformation of the projection in the crawler circumferential direction is suppressed as compared with the case where the constricted portion is formed. Is done.
As mentioned above, according to the core metal for crawlers of Claim 1, the deformation | transformation of the protrusion by the input from a driving wheel can be suppressed.

  The invention according to claim 2 is the invention according to claim 1, further comprising an inner rib formed on the inner side in the crawler width direction of the protrusion, protruding inward in the crawler width direction, and extending from the core metal body toward the tip of the protrusion. It is a core for crawlers.

In the crawler core metal according to claim 2, since the inner rib extending from the core metal body toward the tip of the protrusion is formed on the inner side in the crawler width direction of the protrusion, the rigidity (bending rigidity or shear rigidity) of the protrusion in the crawler width direction is formed. ) Will improve. Thereby, even if the input in the crawler width direction acts on the protrusion, for example, the bending deformation of the protrusion in the crawler width direction can be suppressed as compared with the case where the inner rib is not formed.
Further, the inner rib further improves the rigidity of the protrusion in the crawler circumferential direction, and can further suppress the bending deformation of the protrusion in the crawler circumferential direction.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the pair of protrusions is formed on the core metal body, protrudes toward the inner peripheral side of the crawler, and extends from one protrusion to the other protrusion. A crawler core bar having a central rib to be coupled.

In the core metal for a crawler according to claim 3, since the central rib extending from one protrusion to the other protrusion is formed on the core metal body, the bending rigidity of the core metal body in the crawler width direction is improved.
Since the pair of protrusions are connected by the central rib, the bending rigidity of the protrusions in the crawler width direction and the crawler circumferential direction is further improved.

  The invention of claim 4 is the invention according to any one of claims 1 to 3, wherein the protrusion is formed at an end portion on the opposite side to the protruding direction of the portion protruding from the core metal body of the protrusion, A crawler core bar having a recess recessed in the protruding direction when viewed.

  In the core for a crawler according to claim 4, when the core is embedded in an elastic crawler, a recess is formed at the opposite end of the protruding portion of the protrusion. Compared with the case where the concave portion is not formed at the end portion and is flat, the adhesion area between the opposite end portion and the elastic body constituting the elastic crawler increases. Thereby, peeling of the elastic body from the end portion on the opposite side is suppressed.

  The invention of claim 5 is a crawler body formed in an endless belt shape by an elastic body, and the crawler body according to any one of claims 1 to 4 embedded in the crawler body at intervals in the crawler circumferential direction. An elastic crawler having a cored bar.

  In the elastic crawler according to the fifth aspect, as described above, the rigidity (bending rigidity or shear rigidity) of the protrusion of the cored bar in the crawler circumferential direction is improved. For this reason, even if the crawler circumferential direction input (for example, input from the driving wheel) acts on the protrusion, the bending deformation of the protrusion in the crawler circumferential direction is suppressed. Thereby, the durability of the elastic crawler is improved.

As described above, the core metal for a crawler according to the present invention can suppress the deformation of the protrusion due to the input from the drive wheel.
Since the elastic crawler of the present invention uses a cored bar that can suppress the deformation of the protrusion due to the input from the drive wheel, the durability is improved.

It is a perspective view containing the partial cross section of the rubber crawler of 1st Embodiment. It is a top view which shows the internal peripheral surface of the rubber crawler of 1st Embodiment. It is a top view which shows the outer peripheral surface of the rubber crawler of 1st Embodiment. It is a side view which shows a part of side surface of the rubber crawler of 1st Embodiment. (A) It is a top view which shows the internal peripheral surface of the metal core of 1st Embodiment. (B) It is a front view of the core metal of 1st Embodiment. (C) It is 5C-5C sectional view taken on the line of FIG. (D) It is a side view of the core metal of 1st Embodiment. It is the X1-X1 sectional view taken on the line of FIG. It is the X2-X2 sectional view taken on the line of FIG. It is the Y1-Y1 sectional view taken on the line of FIG. It is a perspective view which shows the internal metal mold | die for rubber crawlers of 1st Embodiment. It is a perspective view which shows the state which loaded the metal core in the inner metal mold | die for rubber crawlers of 1st Embodiment. It is Z1-Z1 sectional view taken on the line of FIG. (A) It is a top view which shows the internal peripheral surface of the metal core of other embodiment. (B) It is a front view of the cored bar of other embodiment.

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

  As shown in FIG. 1, an endless rubber crawler 10 that is an example of an elastic crawler according to the first embodiment is an example of a sprocket 100 that is an example of a driving wheel of a crawler vehicle (for example, a tractor) and an example of a driven wheel. It is used by being wound around an idler (not shown).

  In the present embodiment, the circumferential direction of the rubber crawler 10 (arrow S in the figure) is described as “crawler circumferential direction”, and the width direction of the rubber crawler 10 (arrow W in the figure) is described as “crawler width direction”. . In addition, the inner peripheral side (arrow IN in the figure) of the rubber crawler 10 when the rubber crawler 10 is wound is referred to as “crawler inner peripheral side”, and the outer peripheral side of the rubber crawler 10 (arrow OUT in the figure) is “crawler” "Outer side". The crawler width direction is orthogonal to the crawler circumferential direction.

  As shown in FIG. 1, the rubber crawler 10 has a crawler main body 12 (an example of a crawler main body) formed in an endless belt shape by a rubber material that is an example of an elastic body.

  As shown in FIGS. 1 and 2, a plurality of core bars 20 are embedded in the crawler main body 12 at intervals in the crawler circumferential direction (a constant interval in this embodiment). The core metal 20 includes a plate-shaped core metal body 22 extending in the crawler width direction. As shown in FIGS. 5 (A), 5 (B), and 6, the core metal body 22 includes a central portion 26 in the crawler width direction and an outer side in the crawler width direction from both ends of the central portion 26 in the crawler width direction. And a pair of wings 28 extending respectively.

As shown in FIGS. 5 (A), 5 (B), and 6, a protrusion 24 that protrudes toward the inner peripheral side of the crawler is formed at the root portion of the wing portion 28. This protrusion 24 is in the protrusion projecting direction (here, the same direction as the arrow IN) so that both wall portions 24K in the crawler circumferential direction gradually increase in length in the crawler circumferential direction from the protrusion tip 24U toward the wing portion 28. Are inclined and project from the wing portion 28 in the crawler circumferential direction.
Further, the end 24T of the wall 24K is located at the same position as the surface 28S on the inner peripheral side of the crawler of the wing 28 or at the outer peripheral side of the crawler from the surface 28S. Specifically, as shown in FIG. 5D, the end portion 24T is on the extension line L extending along the boundary surface between the protrusion 24 and the surface 28S of the wing portion 28, or on the crawler outer periphery more than the extension line L. Located on the side.
In addition, as shown in FIGS. 5C and 5D, the protrusion 24 of the present embodiment has a substantially triangular shape when viewed from the side of the crawler.

  As shown in FIGS. 5 (A), 5 (B), and 6, the central portion 26 projects to the inner peripheral side of the crawler and extends from one projection 24 to the other projection 24 to connect the pair of projections 24. A central rib 44 is formed. As shown in FIGS. 5C and 5D, the central rib 44 is formed at the central portion of the central portion 26 in the crawler circumferential direction.

  As shown in FIGS. 5 and 6, the inner surface 24 </ b> A on the inner side in the crawler width direction of the protrusion 24 protrudes inward in the crawler width direction (in other words, on the center line CL side described later), and the central rib 44 of the central portion 26. An inner rib 46 extending from the protrusion toward the protrusion tip 24U is formed. The inner rib 46 has a projection height (projection amount) that decreases from the wing portion 28 toward the projection tip 24U.

  As shown in FIG. 5C and FIG. 5D, the crawler has an end 24D opposite to the protrusion protruding direction (the protruding direction of the protrusion 24) of the portion of the protrusion 24 protruding from the wing 28. A groove-like recess 48 that is recessed in the protrusion projecting direction when viewed from the side is formed. The concave portion 48 extends in the crawler width direction and has a curved shape in which the concave wall and the concave bottom are continuously and smoothly curved.

  In this embodiment, the crawler circumferential direction, the crawler width direction, the crawler inner circumferential side, and the crawler outer circumferential side of the cored bar 20 are the plate width direction of the cored bar body 22 (the sheet width direction of the cored bar 20), the plate It can be read as the longitudinal direction (the longitudinal direction of the plate of the cored bar 20), the protruding direction side of the projection 24 (the projected protruding direction side of the cored bar 20), and the opposite side of the protruding protruding direction (the antiprojection protruding side of the cored bar 20). Can do.

  As shown in FIGS. 1, 4, and 6, the crawler main body 12 is provided with a protrusion 24 that protrudes from an inner peripheral surface (in this embodiment, a plane that passes through a roller passing surface 36 described later). A plurality of rubber projections 14 covered with the rubber material to be formed are formed. The rubber protrusion 14 is formed with a passage space between the sprocket 100 and an idler (not shown).

  2 and 6, the crawler main body 12 includes a rolling surface 30 on which a sprocket 100 and an idler (not shown) roll between the central portions 26 of the core bars 20 adjacent to each other in the crawler circumferential direction. Is formed.

  As shown in FIGS. 2 and 6, the crawler main body 12 is formed with an engagement recess 32 into which the tooth portion 100 </ b> B of the sprocket 100 is inserted and engaged between the rubber protrusions 14 adjacent to each other in the crawler circumferential direction. . As shown in FIG. 2, a pair of the engaging recesses 32 are formed in the crawler width direction.

  Here, the sprocket 100 and idler (not shown) around which the rubber crawler 10 of this embodiment is wound will be described. As shown in FIGS. 1 and 6, the sprocket 100 includes a disc-shaped main body portion 100A and a pair of tooth portions 100B that extend radially outward from both axial ends of the outer peripheral portion of the main body portion 100A. Has been. Note that the pair of tooth portions 100B are formed on the outer periphery of the main body portion 100A at regular intervals in the circumferential direction. On the other hand, the idler has a disk shape.

  As shown in FIGS. 2 and 7, the crawler body 12 has one or more rolling wheels 104 provided between the sprocket 100 and an idler (not shown) on the outer side of the engagement recess 32 in the crawler width direction. A moving flat roller passing surface 36 is formed continuously in the crawler circumferential direction. In addition, the wheel 104 of this embodiment is comprised by a pair of disc member 104A. The disk member 104A has its outer peripheral end folded back outward, and the radially outer surface (the outer circumferential surface of the disk member 104A) of the folded portion is in contact with the wheel passing surface 36. The pair of disk members 104 </ b> A straddles the pair of rubber protrusions 14.

  In the present embodiment, as shown in FIG. 6, the sprocket 100 and idler (not shown) pass between the pair of rubber projections 14 while being guided by the rubber projections 14 and roll on the rolling surface 30. As shown in FIG. 7, the wheel 104 rolls on the wheel passing surface 36 while being guided by the pair of rubber protrusions 14.

  In the present embodiment, as shown in FIGS. 2 and 3, the center of the core metal 20 in the crawler width direction and the center of the crawler body 12 in the crawler width direction coincide with each other. In addition, the code | symbol CL in a figure has shown the center line (The center line of the crawler width direction of the metal core 20 in this embodiment) of the rubber crawler 10. FIG.

  As shown in FIGS. 1 and 3, the crawler main body 12 is formed with a pair of block-like long lugs 38 protruding in the crawler outer peripheral side and extending in the crawler width direction in the crawler width direction across the center line CL. The crawler body 12 is formed with a pair of short rugs 40 in the crawler width direction with the center line CL sandwiched between them and protruding in the crawler width direction. The pair of long lugs 38 and the pair of short lugs 40 are alternately formed at intervals in the crawler circumferential direction.

  The end portions of the long lugs 38 on the outer side in the crawler width direction reach the end portions in the crawler width direction of the crawler body 12 respectively. On the other hand, the short lug 40 is shorter in the crawler width direction than the long lug 38, and the end portion on the outer side in the crawler width direction is located on the inner side in the crawler width direction than the end portion in the crawler width direction of the crawler body 12. .

  As shown in FIGS. 3 and 8, the pair of long lugs 38 and the pair of short lugs 40 are disposed between the core bars 20 adjacent to each other in the crawler circumferential direction. That is, it is arranged on the crawler outer peripheral side of the rolling surface 30 in the crawler side view (see FIG. 8). The long lug 38 and the short lug 40 support the weight of the vehicle and exert the traction force of the rubber crawler 10.

  As shown in FIG. 5, an endless belt-like reinforcing layer 42 extending in the crawler circumferential direction is embedded in the crawler main body 12 on the crawler outer circumferential side of the core metal 20. This reinforcing layer 42 is for maintaining the tension of the rubber crawler 10, and is a single reinforcing cord wound spirally along the crawler circumferential direction or a plurality of cords arranged in parallel along the crawler circumferential direction. These reinforcing cords are formed by rubber coating. In this embodiment, a steel cord having excellent tensile strength is used as the reinforcement cord for maintaining the tension of the reinforcing layer 42. However, the present invention is not limited to this configuration, and the tension of the reinforcing layer 42 can be maintained. For example, a cord made of organic fiber or the like may be used as the reinforcing cord as long as it has a tensile strength of 5.

Next, a method for manufacturing the rubber crawler 10 will be described.
First, an inner mold 50 for a crawler used for vulcanization of the rubber crawler 10 will be described with reference to FIG. As shown in FIG. 9, the inner mold 50 is for molding the inner peripheral side of the rubber crawler 10, and a mold recess 52 simulating the inner peripheral part of the rubber crawler 10 is formed. In the mold recess 52, a core metal support portion 56 including a groove portion 54 extending in the width direction in which the central rib 44 of the central portion 26 of the core metal 20 is fitted is formed. When the central rib 44 is inserted into the groove portion 54 of the metal core support portion 56, the groove bottom surface 54A of the groove portion 54 and the innermost peripheral surface 44A of the central rib 44 come into contact with each other as shown in FIG. The wall surface 54B and the side surface 44B of the central rib 44 abut each other. As a result, the central rib 44 is supported (restrained) in the longitudinal direction by the groove 54. The longitudinal direction and the width direction of the inner mold 50 correspond to the plate width direction and the plate longitudinal direction of the cored bar 20, respectively, and are indicated by arrows S and W in FIGS.

  In addition, as shown in FIGS. 10 and 11, a pair of insertion recesses 58 into which the protrusions 24 of the core metal 20 are inserted are formed in the mold recess 52 on both sides in the width direction of the core metal support 56. The insertion recess 58 has substantially the same shape as the protrusion 24 and can support the inserted protrusion 24 in the longitudinal direction and the width direction.

  Furthermore, as shown in FIG. 10, the end wall surface in the width direction of the cored bar support portion 56 extends downward from the groove bottom surface 54 </ b> A of the groove portion 54 along the inner wall surface 58 </ b> A on the inner side in the width direction of the insertion recess 58. A groove portion 60 extending to a deep portion 58 is formed. An inner rib 46 of the protrusion 24 of the core metal 20 is inserted into the groove 60 from above. As shown in FIG. 11, when the inner rib 46 is inserted into the groove portion 60, the inner rib 46 is supported by the groove portion 60 in the longitudinal direction by the contact between the groove wall surface of the groove portion 60 and the side surface of the inner rib 46 ( Restrained).

Next, the manufacturing procedure of the rubber crawler 10 will be described.
First, an unvulcanized rubber material (not shown) constituting the inner peripheral portion of the rubber crawler 10 is placed in the inner mold 50 shown in FIG. At this time, the unvulcanized rubber material is not disposed in the vicinity of the support portion (not shown) of the groove portion 54 and the insertion recess 58. Next, as shown in FIG. 10, the core metal 20 is inserted into the pair of insertion recesses 58 with the projection tips 24U of the projections 24 facing down, and the inner ribs 46 of the projections 24 are respectively connected to the projections 24. The central rib 44 is inserted into the groove portion 54 and inserted into the groove portion 60.

  Then, an adhesive rubber (not shown) is placed on the bottom surface (upper surface in the figure) of the cored bar 20, and the reinforcing layer 42 is placed thereon. Thereafter, an unvulcanized rubber material (not shown) constituting the outer peripheral portion of the rubber crawler 10 is disposed on the reinforcing layer 42 and an outer mold (not shown) for molding the outer peripheral side of the rubber crawler 10. And the inner mold 50 are overlapped. The outer mold is previously loaded with an unvulcanized rubber material (not shown) for forming the long lugs 38 and 40. And a long belt-like rubber body is formed by vulcanizing for a predetermined pressure, a predetermined temperature, and a predetermined time.

  Next, the both ends of the longitudinal direction left in the semi-vulcanized or unvulcanized state of the belt-shaped rubber body are overlapped and vulcanized. Thereby, the endless belt-like rubber crawler 10 is formed.

Here, according to the above manufacturing procedure, the central rib 44 of the cored bar 20 is fitted into the groove part 54 of the cored bar support part 56, the pair of protrusions 24 are inserted into the pair of insertion concave parts 58, and the protrusion 24 is inserted into the groove part 60. Since the inner rib 46 is inserted, the core 20 is restrained in the longitudinal direction and the width direction with respect to the inner mold 50. Thereby, malfunctions, such as position shift of the metal core 20 by the rubber flow at the time of vulcanization, and inclination of the metal core 20, can be improved effectively.
Thus, the rubber crawler with which the malfunction was improved can exhibit a desired performance compared with the thing by which the said malfunction is not improved.

  Further, the removal of the belt-shaped rubber body from the inner mold 50 is performed while winding the belt-shaped rubber body from the longitudinal end of the inner mold 50. During this operation, the longitudinal wall surface of the insertion recess 58 and the circumferential wall surface of the protrusion 24 are both inclined in substantially the same direction (inclined in substantially the same direction when the protrusion 24 is inserted into the insertion recess 58). Both collisions are avoided, and problems such as damage to the longitudinal wall surface of the insertion recess 58 are prevented.

Next, the operation of the cored bar 20 and the rubber crawler 10 of this embodiment will be described.
In the rubber crawler 10, the tooth portion 100B of the sprocket 100 is inserted into and engaged with the engagement recess 32 of the crawler body 12 (as shown in FIG. 8, the tooth portion 100B on the inclined surface 14A in the tire circumferential direction of the rubber protrusion 14). When the sprocket 100 is rotated in a state where the curved pressing surface is in contact), the inclined surface 14A is pressed by the tooth portion 100B and the driving force is transmitted.

Here, the protrusions 24 of the cored bar 20 are inclined with respect to the protrusion protruding direction so that the wall parts 24K on both sides gradually increase in length in the crawler circumferential direction from the protrusion tip 24U toward the blade part 28. It overhangs from 28. Further, the end 24T of the wall 24K is located at the same position as the surface 28S of the wing 28 or on the outer periphery side of the crawler from the surface 28S. That is, in the protrusion 24, the wall 24K is continuously inclined from the protrusion tip 24U to at least the surface 28S, and a crawler circumferential direction constriction is not formed in the middle. For this reason, for example, the protrusion 24 has improved rigidity (bending rigidity or shear rigidity) in the crawler circumferential direction as compared with the one in which the constricted portion is formed.
As a result, even if an input in the crawler circumferential direction (in this case, an input from the sprocket 100) is applied to the protrusion 24, the protrusion 24 is bent in the crawler circumferential direction as compared with, for example, the constricted portion formed. Deformation is suppressed.

  As described above, according to the cored bar 20, it is possible to suppress the deformation of the protrusion 24 due to the input from the sprocket 100.

  Moreover, since such a metal core 20 is used, the durability of the rubber crawler 10 is improved. Furthermore, since the rubber crawler 10 suppresses deformation of the protrusion 24 of the core metal 20, the input (driving force) from the sprocket 100 is efficiently transmitted to the crawler main body 12 through the core metal 20. Thereby, the fuel consumption of the vehicle using the rubber crawler 10 is improved.

Further, in the cored bar 20, the inner rib 46 extending from the central rib 44 of the central portion 26 toward the distal end 24 U of the protrusion is formed on the inner side of the protrusion 24 in the crawler width direction. (Bending rigidity and shear rigidity) are improved. Thereby, even if the input in the crawler width direction acts on the protrusion 24, for example, the bending deformation of the protrusion 24 in the crawler width direction can be suppressed as compared with the case where the inner rib 46 is not formed on the protrusion 24. .
Further, the inner rib 46 can further improve the rigidity of the protrusion 24 in the crawler circumferential direction, and can further suppress the bending deformation of the protrusion 24 in the crawler circumferential direction.

Furthermore, in the cored bar 20, since the central rib 44 extending from the one projection 24 to the other projection 24 is formed on the cored bar body 22, the bending rigidity of the cored bar body 22 in the crawler width direction is improved.
Since the pair of protrusions 24 are connected by the central rib 44, the bending rigidity of the protrusions 24 in the crawler width direction and the crawler circumferential direction is further improved.

  Furthermore, in the cored bar 20, since the recessed part 48 is formed in the end part 24D of the projecting portion of the protrusion 24, for example, compared with the end part 24D in which the recessed part 48 is not formed and is flat. The adhesion area between the end 24D and the rubber material increases. Thereby, peeling of the rubber material from the end 24D is suppressed. Further, when a crack occurs in the rubber material along the end 24D from the vicinity of the tip of the end 24D toward the wing portion 28, the recess 24 is formed in the end 24D. Slow around 48. That is, the recess 48 effectively suppresses the rubber material from peeling or cracking around the end 24D.

(Other embodiments)
As shown in FIG. 12, it is good also as a structure which newly provides recessed part 49A, 49B in the metal core 20 of 1st Embodiment. Specifically, groove-like recesses 49A extending inward and outward in the crawler and recessed toward the center of the central portion 26 are formed on both sides in the crawler circumferential direction at both ends in the crawler width direction of the central portion 26, respectively. A groove-like recess 49B extending inward and outward of the crawler and recessed toward the center of the wing 28 is formed on both sides in the crawler circumferential direction near the root of the projection 24 of the wing 28. As described above, by forming the concave portions 49A and 49B, it is possible to prevent the central portion 26 and the crawler main body 12 from being peeled similarly to the concave portion 48 described above, and the wing portion 28 and the crawler main body 12 are peeled off. Can be prevented. In addition, the progress of cracks along both side surfaces of the central portion 26 in the crawler circumferential direction can be suppressed, and the progress of cracks along both side surfaces of the wing portion 28 in the crawler circumferential direction can be suppressed.

  In the above-described embodiment, the rubber crawler 10 is an elastic crawler having a configuration in which tension is held by the reinforcing layer 42, but the present invention is not limited to this configuration, and the adjacent core is not used without using the reinforcing layer 42. As a so-called link-type elastic crawler in which the gold members 20 are connected to each other with a ring-shaped connecting member, or the connecting portions formed on each core metal are connected to each other, and the tension of the elastic crawler is maintained between the connected core metals. Also good.

  Further, in the above-described embodiment, the rubber crawler 10 is configured by a rubber material as an example of an elastic body. However, the present invention is not limited to this configuration, and the rubber crawler 10 is configured by an elastomer other than rubber. Also good.

  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 rigidity 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 Rubber crawler (elastic crawler)
12 Crawler Main Body 20 Core Bar 22 Core Bar Main Body 24 Projection 24A Inner Side 24D End 24K Wall 24U Projection Tip 28S Surface (Crawler Inner Side Surface of Core Bar Main Body)
44 Central rib 46 Inner rib 48 Recessed part S Crawler circumferential direction W Crawler width direction IN Crawler inner circumference OUT Crawler outer circumference

Claims (5)

A crawler cored bar embedded in an endless elastic crawler wound around a drive wheel at an interval in the crawler circumferential direction,
A plate-shaped cored bar body extending in the crawler width direction;
A pair of core metal bodies are formed at intervals in the crawler width direction, projecting toward the inner periphery of the crawler, and both wall portions in the crawler circumferential direction gradually increase in length in the crawler circumferential direction from the tip of the projection toward the core metal body. So as to be inclined with respect to the projecting direction and project from the core metal body, and the end of the wall portion is at the same position as the surface of the inner circumference side of the core metal body or closer to the outer circumference of the crawler than the surface. A protrusion that is positioned and receives a driving force from the driving wheel on the wall ;
A core for a crawler.   The core metal for a crawler according to claim 1, further comprising: an inner rib that is formed on an inner side in the crawler width direction of the protrusion, protrudes inward in the crawler width direction, and extends from the core metal body toward the tip of the protrusion.   The center rib which is formed in the core metal main body, protrudes to the inner peripheral side of the crawler, extends from one of the protrusions to the other protrusion, and connects the pair of protrusions. Core metal for crawlers.   4. The device according to claim 1, further comprising: a concave portion that is formed at an end portion of the protrusion that protrudes from the core metal body on the side opposite to the protruding direction and is recessed in the protruding direction when viewed from the side of the crawler. A core bar for a crawler according to item. A crawler body formed in an endless belt shape by an elastic body;
The cored bar for a crawler according to any one of claims 1 to 4, embedded in the crawler body at an interval in a crawler circumferential direction,
Elastic crawler with.

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