JP5676141B2 - Crawler mandrel and rubber crawler - Google Patents

Description

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

  Some rubber crawlers are configured by embedding at least a part of an endless crawler reinforcing body formed by assembling a plurality of types of crawler reinforcing members (see, for example, Patent Document 1). ). In Patent Document 1, rectangular parallelepiped blocks are arranged in a staggered pattern in the crawler circumferential direction to form two rectangular parallelepiped block rows, and rods are inserted into the through holes of the first rectangular parallelepiped block and the through holes of the second rectangular parallelepiped block. The cuboid block is connected in the crawler circumferential direction to fit the body, thereby constituting a crawler reinforcement.

JP 2002-37154 A

By the way, in patent document 1, since the crawler reinforcement body is constituted by fitting the rod body into the through-hole of the cuboid block, for example, a force that relatively displaces the cuboid block and the rod body in the crawler width direction is applied. In this case, relative displacement in the crawler width direction between the rectangular parallelepiped block and the rod cannot be sufficiently suppressed, and wear between the through hole of the rectangular parallelepiped block and the rod tends to be promoted. When the wear between the inner wall of the through hole of the rectangular parallelepiped block and the rod progresses, the durability of the crawler reinforcement (rubber crawler) decreases as the wear progresses.
For this reason, it is conceivable to use a fixing tool or the like separately to suppress the relative displacement in the crawler width direction between the rectangular parallelepiped block and the rod, but the number of dedicated parts such as the fixing tool increases and the connecting operation is complicated It becomes a thing.

  The present invention is a crawler core bar which can be connected by a simple operation without increasing the number of dedicated parts for connection, and which has improved durability by suppressing wear of the core bar connection part during crawler travel, and The purpose is to provide a used rubber crawler.

The core metal for a crawler according to the first aspect of the present invention is a core metal for a crawler that is arranged at a constant interval in the circumferential direction and is connected to each other adjacent in the circumferential direction to constitute an endless crawler belt. A pair of inner peripheral projections that are spaced apart from each other in the width direction of the crawler belt and project toward the inner peripheral side of the crawler belt and extend in the circumferential direction. A cored bar having a first through hole penetrating in the width direction and a second through hole penetrating in the width direction provided at a position spaced apart from the first through hole of the inner peripheral protrusion in the circumferential direction. A connecting member that is inserted through the main body and the second through hole of the core metal body adjacent to the first through hole of the core metal body and connects the core metal body and the adjacent core metal body; The connecting member passes through the first through hole and the pair of A shaft portion disposed between the peripheral projections, and a pair of wing portions extending from both ends of the shaft portion to the outside in the width direction and passing through the first through hole, the first through hole The inner wall is formed with a groove portion extending in the width direction on the opposite side to the second through hole and accommodating the circumferential end portion of the wing portion, and at least a part of the wing portion is accommodated in the groove portion. In this state, when viewed from the width direction, the shaft portion overlaps the inner peripheral projection, and the movement of the shaft in the width direction causes contact between the shaft and the inner peripheral projection. Is regulated by

  In the metal core for a crawler according to claim 1, the connecting member is inserted into the first through hole of the metal core body and the second through hole of the adjacent metal core body, and at least a part of the wing part is accommodated in the groove part. The core metal body adjacent to the core metal body is coupled. That is, adjacent cored bars can be connected without increasing the number of dedicated parts for connection. In addition, the connecting operation between the adjacent core bars is also performed by inserting the connecting member into the first through hole of the core metal body and the second through hole of the adjacent core metal body, and storing at least a part of the wing part in the groove part. It can be done with simple operations.

  Further, in a state where adjacent core bars are connected to each other (a state in which at least a part of the wing portion is accommodated in the groove portion), the movement of the shaft portion in the width direction is restricted by contact with the inner peripheral side protruding portion. Is done. That is, the relative displacement in the width direction between the core metal body and the connecting member is restricted. Thereby, the abrasion (especially abrasion of the inner wall of a 1st through-hole) between the inner wall and shaft part of a 1st through-hole by the relative displacement of the width direction is suppressed. As a result, the durability of the core metal is improved.

  As described above, according to the core metal for a crawler according to claim 1, it is possible to connect by a simple operation without increasing the number of dedicated parts for connection, and the core metal connection part (the inner wall and the shaft portion of the first through hole) during crawler traveling ) And the durability can be improved.

  The crawler cored bar of claim 2 is the crawler cored bar of claim 1, wherein the maximum length in the circumferential direction of the shaft portion is longer than the maximum length in the circumferential direction of the wing portion.

During crawler travel, the wing receives input from the road surface. When this wing portion is provided at the end of the shaft portion, the input from the road surface received by the wing portion is also distributed to the shaft portion, so that deformation of the wing portion due to stress is suppressed.
Here, in the metal core for a crawler according to claim 2, the circumferential maximum length of the shaft portion is made longer than the circumferential maximum length of the wing portion. The strength of the shaft part can be sufficiently ensured compared to the same in the circumferential maximum length of the part or the circumferential maximum length of the shaft part shorter than the maximum circumferential length of the wing part. The deformation of the shaft portion due to the input from the road surface received by the portion can be effectively suppressed.

  The core metal for the crawler according to claim 3 is the core metal for the crawler according to claim 1 or 2, wherein the core metal body is provided between the pair of inner peripheral side projections. While connecting a side protrusion part, it has a connection part at least one part arrange | positioned along the said 2nd through-hole.

In the metal core for a crawler according to claim 3, the pair of inner peripheral projections are connected by the connecting portion, so that the interval between the pair of inner peripheral projections and the holes of the pair of inner peripheral projections The position is maintained.
In addition, since at least a part of the connecting portion is disposed along the second through hole, the connecting member of the core metal body adjacent to the second through hole of the core metal body in a state where adjacent core bars are connected to each other. The contact area with the shaft portion can be increased, for example, compared to a case where at least a part of the connecting member is not disposed along the second through hole. Thereby, the wear of the inner wall of the second through hole is suppressed, and the durability of the cored bar is improved.
In particular, the inner wall portion of the second through-hole of the metal core body that comes into contact with the shaft portion of the adjacent metal core body in a state in which the adjacent metal cores are connected to each other tends to wear faster than the other parts. It is preferable to arrange at least a part of the connecting portion along the inner wall portion of the second through hole. When at least a part of the connecting portion is disposed along the contact portion of the second through-hole, the connecting portion is provided in a state where adjacent core bars are connected to each other and has sufficient durability against circumferential tension. .
In addition, from the viewpoint of suppressing wear of the second through hole, it is most preferable to dispose the connecting portion around the entire circumference of the second through hole.

  The crawler cored bar according to a fourth aspect is the crawler cored bar according to any one of the first to third aspects, wherein the distance between the pair of inner peripheral projections is more than the first through hole side. A pair of inner peripheries of the core metal bodies adjacent to each other on the first through hole side of the pair of inner peripheral side projections of the core metal body in a state where the adjacent core bars are narrowly connected on the second through hole side. The second through-hole side of the side protrusion enters.

  The core metal for a crawler according to claim 4, wherein a pair of inner peripheral sides of the core metal adjacent to the first through hole side of the pair of inner peripheral projections of the core metal in a state in which the adjacent core bars are connected to each other. Since the second through hole side of the protrusion is inserted, the relative movement in the width direction of the core metal body and the adjacent core metal body is the first through hole side of the pair of inner peripheral protrusions of the core metal body. And the contact between the pair of inner peripheral protrusions of the adjacent metal core bodies and the second through hole side.

  The crawler core bar according to claim 5 is the crawler core bar according to claim 4, wherein the front inner peripheral projection is provided on at least one of the inner side surface and the outer side surface in the width direction, and the width direction. And a reinforcing rib extending from the first through hole to the second through hole.

In the core for a crawler according to claim 5, at least one of the inner side surface and the outer side surface in the width direction of the inner peripheral projection is provided with a reinforcing rib that protrudes in the width direction and extends from the first through hole to the second through hole. Therefore, the durability of the inner peripheral projections against the tensile force in the circumferential direction acting on the inner wall of each of the first through hole and the second through hole, and the shearing force resulting therefrom is improved.
Further, the core metal for a crawler according to claim 5 can improve durability while suppressing an increase in weight, compared with a core metal that simply increases the thickness of the entire inner peripheral projection and improves durability. .

  A core metal for a crawler according to a sixth aspect is the core metal for a crawler according to the fifth aspect, wherein a part of the reinforcing rib is disposed along the first through hole and the groove portion.

  In the core metal for a crawler according to claim 6, since a part of the reinforcing rib is provided along the shape of the first through hole and the groove portion, a circumferential tension is received from the wing portion of the connecting member when the crawler travels. The first through hole and the groove are reinforced. Thereby, the deformation | transformation of the 1st through-hole and a groove part by the tension | tensile_strength at the time of crawler driving | running | working is suppressed, respectively, and durability of a metal core improves.

  A rubber crawler according to a seventh aspect is provided with a rubber elastic body on the outer peripheral side of a crawler belt formed using the core metal for a crawler according to any one of the first to sixth aspects.

  The rubber crawler according to claim 7 uses a crawler belt configured by connecting a core metal for a crawler that can be connected by a simple operation without increasing the number of dedicated parts for connection and can suppress wear of a core metal connection part. Therefore, the productivity of the rubber crawler is improved, and further, the wear of the cored bar connecting portion is suppressed and the durability of the rubber crawler is improved.

  As described above, the core metal for a crawler according to the present invention can be connected by a simple operation without increasing the number of dedicated parts for connection, and wear of the core metal connection portion can be suppressed. Further, the rubber crawler of the present invention uses a crawler belt configured by connecting a core metal for a crawler that can be connected by a simple operation without increasing the number of dedicated parts for connection and can suppress wear of a core metal connection part. Therefore, the productivity is improved and the durability of the rubber crawler is further improved.

It is a side view of the rubber crawler of a 1st embodiment of the present invention. It is the top view which looked at the internal peripheral surface of the rubber crawler of 1st Embodiment of this invention. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. It is the perspective view which looked at the metal core of 1st Embodiment of this invention from diagonally upward. (A) is a top view of the core metal of 1st Embodiment. FIG. 6B is a side view of the cored bar of FIG. (C) is the front view of the metal core of FIG. 5 (A) seen from the arrow C direction. (D) is the DD sectional view taken on the line of the metal core of FIG. 5 (A). It is the perspective view which looked at the metal core from diagonally upward showing the operation | movement which connects the metal cores of 1st Embodiment. It is the perspective view which looked at the metal core from diagonally upward which shows the state which connected metal cores of 1st Embodiment. It is the top view which looked at the internal peripheral surface of the crawler belt comprised by connecting the metal cores of 1st Embodiment. (A) is a side view of the core metal with which adjacent ones of the first embodiment are connected. (B) is the B section enlarged view of FIG. 9 (A). (A) It is the perspective view which looked at the metal core from diagonally upward showing the operation | movement which connects the metal cores of the modification of the metal core of 1st Embodiment. (B) It is the perspective view which looked at the metal core from diagonally upward which shows the state which connected the metal cores of FIG. 10 (A). It is the perspective view which looked at the metal core of 2nd Embodiment of this invention from diagonally upward. (A) is a top view of the metal core of 2nd Embodiment. FIG. 13B is a side view of the cored bar of FIG. FIG. 13C is a front view of the cored bar of FIG.

[First Embodiment]
Hereinafter, a first embodiment of a core metal for a crawler of the present invention and a rubber crawler using the same will be described with reference to FIGS.

  As shown in FIG. 1, the rubber crawler 10 of the first embodiment is used by being wound around a sprocket 100 and an idler 102 of a crawler vehicle. On the outer peripheral side of an endless crawler belt 13, rubber or the like is used. An endless rubber elastic body 12 made of an elastic body is provided.

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

  As shown in FIGS. 1 and 3, lugs 14 are formed on the outer peripheral surface of the rubber elastic body 12 at a predetermined interval in the circumferential direction. In this embodiment, the lug 14 is configured to extend along the width direction. However, the configuration is not limited thereto, and for example, the lug 14 may be configured to be inclined with respect to the width direction. The shape of the lug 14 may be any shape as long as the pulling force of the rubber crawler can be sufficiently exhibited.

  As shown in FIGS. 1 and 2, a plurality of core bars 20 (see FIGS. 4 and 5) are embedded on the inner peripheral side of the rubber elastic body 12 at regular intervals in the circumferential direction. The plurality of metal cores 20 adjacent to each other in the circumferential direction are connected to each other to form an endless crawler belt 13. The details of the crawler belt 13 and the cored bar 20 will be described later.

  As shown in FIG. 2, a sprocket engagement hole 16 (from the inner peripheral surface to the outer peripheral surface of the rubber elastic body 12) in which the tooth portion of the sprocket 100 engages (fits) is provided at the center in the width direction of the rubber elastic body 12. Through-holes). The driving force from the sprocket 100 is transmitted to the rubber crawler 10 by the teeth of the sprocket 100 being engaged with the sprocket engagement hole 16. In the present embodiment, the sprocket engagement hole 16 with which the tooth portion of the sprocket 100 is engaged (fitted) is formed in the rubber elastic body 12, but the tooth portion of the sprocket 100 is engaged (fitted). If possible, a configuration may be adopted in which a recess is formed on the inner peripheral surface of the rubber elastic body 12.

  As shown in FIGS. 2 and 3, the core metal 20 embedded in the rubber elastic body 12 has a pair of guide wall portions 26 to be described later projecting toward the inner peripheral side, and each of the core bars 20 from the inner peripheral surface of the rubber elastic body 12. The top surface 26D is exposed. In the present embodiment, the top surfaces 26D of the pair of guide wall portions 26 are exposed from the inner peripheral surface of the rubber elastic body 12, but the present invention is not limited to this configuration, and the pair of guides The top surface 26D of each wall portion 26 may be configured not to be exposed.

As shown in FIG. 1, the sprocket 100 and the idler 102 pass between the pair of guide wall portions 26 (see FIGS. 2 and 3). Further, in the rolling wheel 104 constituted by the cylindrical large diameter portion and the cylindrical small diameter portion 104A provided with the axial center aligned with the side surface of the large diameter portion, the small diameter portion 104A has the guide wall portion 26. The large-diameter portion passes between the pair of guide wall portions 26. Specifically, in the roller wheel 104, the outer peripheral surface of the small diameter portion 104A is supported by being grounded to the top surface 26D (when exposed) of the guide wall portion 26 or rubber (when rubber is covered) on the top surface 26D, The outer peripheral surface of the large diameter portion does not come into contact with the rubber portion (rubber portion on the sprocket engaging portion 24) between the pair of guide wall portions 26. The roller 104 may be provided with the small diameter portion 104A on both side surfaces of the large diameter portion or may be provided with the small diameter portion 104A on one side surface of the large diameter portion.
Further, the wheel 104 of the present embodiment is configured by a large-diameter portion that passes between the pair of guide wall portions 26 and a small-diameter portion 104A that passes over the top surface 26D of the guide wall portion 26. The configuration of 104 may be other configurations. For example, the wheel 104 includes a small-diameter portion 104A that passes over the top surface 26D of each of the pair of guide wall portions 26, and a pair of large-diameter portions that are provided on both side surfaces of the small-diameter portion 104A and straddle the pair of guide wall portions 26. It may be composed of
Note that the sprocket 100 and the idler 102 may be different from the present embodiment shown in FIG.

Next, the core metal 20 will be described.
(Whole core composition)
As shown in FIGS. 4 and 5A to 5D, the cored bar 20 includes a cored bar body 22 and a connecting member 28. The core metal body 22 of this embodiment is an example of the core metal body of the present invention, and the connecting member 28 is an example of the connecting member of the present invention.

The core metal main body 22 is disposed in the width direction so as to be spaced apart and project toward the inner peripheral side and extend in the circumferential direction, and an outer peripheral side portion (outer peripheral side portion) of the pair of guide wall portions 26 ) And a second through hole 34 penetrating in the width direction provided at a position spaced apart from the first through hole 36 of the pair of guide wall portions 26 in the circumferential direction. A sprocket engaging portion 24 provided between the pair of guide wall portions 26 and connecting the pair of guide wall portions 26 and at least a part of which is disposed along the second through hole 34. .
In addition, as shown to FIG. 5 (A) and (B), the metal core main body 22 of this embodiment system is made symmetrical with respect to the center line CL in the width direction. The cored bar body 22 is configured by integrally forming a pair of guide wall portions 26, a first through hole 36, a second through hole 34, and a sprocket engaging portion 24.

As shown in FIGS. 6 and 7, the connecting member 28 includes the first through holes 36 of the pair of guide wall portions 26 of the core metal body 22 and the pair of guide wall portions 26 of the adjacent core metal bodies 22. The adjacent core metal bodies 22 are connected to each other through the second through holes 34. 4 and 5A, the connecting member 28 includes a pin portion 32 that passes through the first through hole 36 and is disposed between the pair of guide wall portions 26, and both ends of the pin portion 32. And a pair of wings 30 extending outward in the width direction and passing through the first through hole 36.
As shown in FIGS. 5A and 5B, the connecting member 28 of the present embodiment is symmetrical with respect to the center line CL in the width direction. The connecting member 28 is configured by integrally forming a pin portion 32 and a pair of wing portions 30.

(Guide wall)
As shown in FIGS. 4, 5 </ b> B, and 5 </ b> D, the guide wall portion 26 has a substantially trapezoidal shape in a side view, and a top surface 26 </ b> D (an end surface on the inner peripheral side) has a flat shape. Note that the shape of the guide wall portion 26 is not limited to a substantially trapezoidal shape in a side view, and may be other shapes such as an inverted trapezoidal shape or a rectangular shape. When the small diameter portion 104A (see FIG. 1) of the roller wheel 104 passes over the top surface 26D, the vibration of the rubber crawler 10 can be effectively suppressed by making the top surface 26D flat.

  As shown in FIGS. 4 and 5A to 5C, the guide wall portion 26 is located on the inner side in the width direction with respect to the wide wall portion 26A on the first through hole 36 side and the wide wall portion 26A. The narrow wall portion 26B on the second through-hole 34 side, and the connecting wall portion 26C that connects the wide wall portion 26A and the narrow wall portion 26B are configured. For this reason, as shown in FIG. 5A, the pair of guide wall portions 26 viewed from the inner peripheral side are narrower walls facing each other than the interval (the distance in the width direction) between the wide wall portions 26A facing each other. The interval (distance in the width direction) between the portions 26B is narrow.

  As shown in FIG. 7, the narrow wall portions 26 </ b> B of the other core metal body 22 facing each other are disposed between the wide wall portions 26 </ b> A of the one core metal body 22 facing each other in a state where the adjacent core bars 20 are connected to each other. The distance of the inner wall surface in the width direction of the wide wall portion 26A and the distance of the inner wall surface in the width direction of the narrow wall portion 26B are set so as to enter.

As shown in FIG. 7, when the crawler belt 13 is configured by connecting adjacent core bars 20, the respective guide wall portions 26 are arranged in a straight line along the circumferential direction.
With this configuration, the sprocket 100, the idler 102, and the wheel 104 are guided to predetermined positions by the guide wall portion 26 when the crawler travels, and the sprocket 100, the idler 102, and the wheel 104 are prevented from being removed.

(First through hole, second through hole)
As shown in FIGS. 4, 5 </ b> B, and 5 </ b> D, the first through hole 36 is a round hole, and the inner diameter is set to be equal to or larger than the outer diameter of the pin portion 32 described later. Is preferred. Similarly, the second through hole 34 is a round hole, and is preferably set so that the inner diameter is the same as or larger than the outer diameter of the pin portion 32 described later.

(Pin part, wing part)
As shown in FIG. 4 and FIGS. 5A to 5D, the pin portion 32 is formed in a columnar shape, and the wing portion 30 extends from the both end portions outward in the width direction along the width direction. The pair of wing portions 30 have a substantially rectangular cross section (rectangular shape with rounded corners), and are provided so as to be in a straight line with respect to the pin portion 32. Further, as shown in FIG. 9B, the circumferential maximum length (diameter) L1 of the pin portion 32 is the maximum circumferential length of the wing portion 30 (in the cross section in the direction orthogonal to the extending direction of the wing portion 30). It is longer than the circumferential maximum length L2. Furthermore, a taper portion 33 is formed at the boundary portion between the pin portion 32 and the wing portion 30 to relieve stress concentration caused by input from the road surface received by the wing portion 30.

  In the present embodiment, the pin portion 32 and the pair of wing portions 30 are configured to be in a straight line, but the present invention is not limited to this configuration, and the pair of wing portions with respect to the pin portion 32. 30 may be configured to extend outward in the width direction while being inclined or curved.

(Groove)
As shown in FIGS. 4, 5 </ b> B, and 5 </ b> D, the inner wall (hereinafter simply referred to as the inner wall of the first through hole 36) constituting the first through hole 36 of the guide wall portion 26 has a second through hole. A groove portion 36 </ b> A extending in the width direction is formed on the opposite side to 34. A circumferential end 30A, which is at least a part of the wing portion 30, is accommodated in the groove 36A. In the present embodiment, the shape of the groove portion 36A is substantially the same as the shape of the circumferential end portion 30A of the wing portion 30.

  9A and 9B, when the circumferential end 30A of the wing portion 30 is housed in the groove 36A, a part of the pin portion 32 is part of the guide wall as viewed from the width direction. It overlaps with the portion 26. Thereby, when the core metal main body 22 and the connecting member 28 are relatively moved in the width direction, the pin portion 32 and the guide wall portion 26 come into contact with each other, and the core metal main body 22 and the connecting member 28 are relatively moved in the width direction. Displacement is regulated.

(Sprocket engaging part)
As shown in FIG. 4, the sprocket engaging portion 24 is provided between the pair of guide wall portions 26 and connects the pair of guide wall portions 26, and at least a part thereof is disposed along the second through hole 34. ing. Specifically, the sprocket engaging portion 24 of the present embodiment is cylindrical and is disposed around the entire circumference of the second through hole 34 so that the second through holes 34 of the pair of guide wall portions 26 are connected to each other. Communicate. Each sprocket engaging portion 24 reinforces each second through hole 34. In addition, the sprocket engaging part 24 of this embodiment is an example of the connection part of this invention.

In the present embodiment, the cylindrical sprocket engaging portion 24 is configured to be disposed on the entire circumference of the second through hole 34, but the present invention is not limited to this configuration, and other shapes (other than the cylindrical shape) are also provided. The sprocket engaging portion 24 may be arranged in a portion that receives the tension in the circumferential direction of the second through hole 34.
On the other hand, when the cylindrical sprocket engaging portion 24 is arranged on the entire circumference of the second through hole 34 as in the present embodiment, the contact area of the portion where the pin portion 32 contacts increases, and the second penetration Wear of the hole 34 can be suppressed.

  As shown in FIG. 8, when the adjacent core bars 20 are connected to form the crawler belt 13, the sprocket engaging portion 24 of one core metal body 22 and the sprocket engaging portion of the other core metal body 22. A hollow portion is formed between 24. As shown in FIG. 2, the sprocket engagement hole 16 of the rubber elastic body 12 is formed at a position corresponding to the hollow portion. Thus, when the tooth portion of the sprocket 100 is engaged (fitted) with the sprocket engagement hole 16, the driving force from the sprocket 100 causes the sprocket engagement portion 24 and the connecting member 28 inserted into the sprocket engagement portion 24 to pass through. Via the crawler belt 13 (rubber crawler 10).

In the present embodiment, the cylindrical sprocket engaging portion 24 is arranged around the entire circumference of the second through-hole 34. However, the present invention is not limited to this configuration, and the sprocket engaging portion 24 is not provided. It doesn't matter.
On the other hand, when the sprocket engaging portion 24 is provided, the driving force from the sprocket 100 is transmitted to the connecting member 28 via the sprocket engaging portion 24, so that the driving force is directly applied from the sprocket 100 to the connecting member 28. The load received by the connecting member 28 is reduced as compared with the input, and a decrease in durability of the connecting member 28 can be suppressed.

  Here, the state where the adjacent metal cores 20 of the present embodiment are connected to each other means that the first through holes 36 of each of the pair of guide wall portions 26 of the (one) metal core body 22 are adjacent (the other one). ) The connecting member 28 is inserted into each of the second through holes 34 of the pair of guide wall portions 26 of the core metal main body 22, and the circumferential end portions of the pair of wing portions 30 are inserted into the respective groove portions 36 </ b> A of the core metal main body 22. This indicates a state in which 30A is accommodated (see FIGS. 7 and 9A).

Next, the connecting operation of the core metal 20 will be described with reference to FIGS.
First, as shown in FIG. 6, one core metal body 22 and the other core metal body 22 are brought close to each other, and each first through hole 36 of one core metal body 22 and each of the other core metal bodies 22 are respectively. Center axis alignment with the second through hole 34 is performed. Next, as shown in FIG. 7, the connecting members 28 are inserted through the first through holes 36 of one core metal body 22 and the second through holes 34 of the other core metal body 22. Then, the circumferential end portions 30 </ b> A of the wing portions 30 of the connecting member 28 are accommodated in the groove portions 36 </ b> A of the one core metal body 22. As a result, one core metal body 22 and the other core metal body 22 are connected.

  As shown in FIGS. 9A and 9B, in a state where adjacent core metal bodies 22 are connected to each other, a part of the pin portion 32 overlaps the guide wall portion 26 when viewed from the width direction. As a result, the relative movement in the width direction between the core metal body 22 and the connecting member 28 is regulated by the contact between the pin portion 32 and the guide wall portion 26.

Further, when the center axes of the first through holes 36 of the one core metal body 22 and the second through holes 34 of the other core metal body 22 are aligned, the wide walls of the one core metal 20 facing each other. The space between the narrow wall portions 26B of the other cored bar 20 facing each other enters between the portions 26A.
As a result, the relative movement in the width direction between the one core metal body 22 and the other core metal body 22 causes the wide wall portion 26 </ b> A of the one core metal body 22 and the narrow wall portion 26 </ b> B of the other core metal body 22 to move. It is regulated by the contact.

  As described above, the connected metal cores 20 are restricted in relative movement (relative displacement) in the width direction between adjacent metal core bodies 22, and the metal core bodies 22 and the connecting members 28 are moved in the width direction. Relative movement (relative displacement) is regulated.

  And the endless crawler belt 13 is comprised by connecting adjacent cored bars 20 by the connection operation mentioned above.

Next, a method for manufacturing the rubber crawler 10 will be described.
First, the endless crawler belt 13 is configured by connecting the plurality of core bars 20 by the connecting operation described above.

  Next, a long unvulcanized rubber elastic body 12 is wound around the outer peripheral side of the crawler belt 13 to form an endless unvulcanized rubber elastic body. At this time, the crawler belt 13 is embedded in the inner peripheral side of the unvulcanized rubber elastic body 12. The top surfaces 26D of the pair of guide wall portions 26 of the core metal 20 may or may not be embedded in the unvulcanized rubber elastic body 12. Needless to say, an unvulcanized rubber elastic body may be wound around the inner peripheral side of the crawler belt 13.

  Thereafter, the rubber elastic body 12 is vulcanized and vulcanized and bonded to the crawler belt 13 by vulcanizing the unvulcanized rubber elastic body 12, whereby the rubber crawler 10 is manufactured.

In the present embodiment, after the core metal 20 is connected to form the crawler belt 13, the rubber elastic body 12 is formed on the outer peripheral side of the crawler belt 13 to manufacture the rubber crawler 10. Not limited to this, a vulcanized rubber elastic body piece is formed on at least the outer peripheral side of the core metal body 22, and these core metal bodies 22 with vulcanized rubber elastic body pieces are connected by a connecting member 28, so that an endless shape is obtained. The endless rubber crawler 10 can also be configured while configuring the crawler belt 13.
Further, a plurality of core bars 20 are connected to form a strip-shaped cored bar coupling body having a length corresponding to one rubber crawler, and a rubber elastic body is vulcanized at least on the outer peripheral side of the cored bar coupling body to form a strip-shaped cored bar. A crawler constituting member is formed, and the end portions in the longitudinal direction of the belt-like crawler constituting member (the first through hole 36 at one end in the circumferential direction and the second through hole 34 at the other end in the circumferential direction) are connected by the connecting member 28. The endless rubber crawler 10 can also be configured by being connected.
On the other hand, when a plurality of core bars 20 are connected and added together, a plurality of strip-shaped core bars connected to one rubber crawler are formed, and rubber elastic bodies are respectively provided on at least the outer peripheral sides of these core bars. Vulcanized to form a plurality of strip-shaped crawler constituent members, and the longitudinal ends of these strip-shaped crawler constituent members are connected by a connecting member 28 to form a single strip-shaped crawler constituent member. Endless rubber crawlers 10 can also be configured by connecting the end portions in the longitudinal direction of the crawler constituent members with connecting members 28.

Next, the effect of the metal core 20 and the rubber crawler 10 according to the first embodiment will be described.
As described above, the metal cores 20 are connected to each other through the first through holes 36 of the one metal core body 22 and the second through holes of the other metal core body 22, as shown in FIGS. 34, the connecting member 28 is inserted into the groove 34 </ b> A of one core metal body 22, and the circumferential end 30 </ b> A of each wing 30 of the connecting member 28 is accommodated. That is, the core bars 20 can be connected without increasing the number of dedicated parts for connection.

  Further, the connecting operation of the cored bar 20 is also performed by the first through holes 36 of the pair of guide wall parts 26 of the one cored bar body 22 and the second of each of the pair of guide wall parts 26 of the other cored bar body 22. The connecting member 28 is inserted through the through hole 34, and the circumferential end 30 </ b> A of each wing 30 of the connecting member 28 is received in each groove 36 </ b> A of each first through hole 36 of the one core metal body 22. This can be done with a simple operation.

  As shown in FIG. 2, in the crawler belt 13 configured by connecting the core bars 20 to each other, the guide wall portions 26 of the core bars 20 are arranged along the circumferential direction. For this reason, the sprocket 100 and the idler 102 passing between the pair of guide wall portions 26 are prevented from being removed. Further, the rolling-out of the rolling wheel 104 in which the large diameter portion passes between the pair of guide wall portions 26 is suppressed.

  By the way, as a conventional rubber crawler, a cored bar is arranged on the inner peripheral side of an endless rubber elastic body at regular intervals in the circumferential direction, and a steel cord is spirally wound or wound in parallel so as to surround the outer periphery of the cored bar. Is known. In this type of conventional rubber crawler, for example, when a rubber elastic body is scratched and water or the like penetrates from the scratch, the steel cord is rusted, the steel cord is broken, and the tension of the rubber crawler is reduced. There is a fear.

  However, in the rubber crawler 10, the tension can be maintained even if the steel cord for maintaining the tension of the conventional rubber crawler is not provided, and the rubber elastic body 12 is used because the crawler belt 13 configured by connecting the core metal 20 is used. Even if water or the like enters from the scratch, the cored bar 20 is less likely to be damaged as compared with the steel cord of the conventional rubber crawler, so that a decrease in the tension of the rubber crawler 10 is suppressed.

  In addition, since the first through hole 36 and the second through hole 34 are formed in the pair of guide wall portions 26, respectively, the first through hole 36 and the second through hole are newly provided in a portion different from the pair of guide wall portions 26. The structure of the cored bar body 22 becomes simpler than the formation of the holes 34, and the weight increase of the cored bar 20 can be suppressed.

  As described above, in the state where the adjacent core bars 20 are connected to each other, the space between the narrow wall portions 26B of the other core metal body 22 is between the wide wall portions 26A of the core metal body 22 facing each other. Therefore, relative movement in the width direction between the one core metal body 22 (core metal 20) and the other core metal body 22 (core metal 20) causes the wide wall portion 26A of the one core metal body 22 and the other core metal body 22 to move in the other direction. It is regulated by contact with the narrow wall portion 26 </ b> B of the core metal body 22.

Further, in a state where adjacent core bars 20 are connected to each other, a part of the pin portion 32 overlaps with the guide wall portion 26 when viewed from the width direction. For this reason, relative movement in the width direction between the metal core body 22 and the connecting member 28 is restricted by the contact between the pin portion 32 and the guide wall portion 26.
As a result, wear between the inner wall of the first through hole 36 and the pin portion 32 (particularly wear of the inner wall of the first through hole 36) is suppressed, and as a result, durability of the cored bar 20 and the crawler belt 13 is improved. To do.

Further, when the crawler travels, the wing 30 receives an input from the road surface. Since the input received by the wing part 30 is distributed to the integrally formed pin part 32, deformation or the like of the wing part 30 due to stress is suppressed.
Here, since the circumferential maximum length (diameter) L1 of the pin portion 32 is longer than the circumferential maximum length L2 of the wing portion 30, for example, the circumferential maximum length of the pin portion 32 and the wing portion 30 are set. The strength of the pin portion 32 can be sufficiently ensured as compared with the same circumferential maximum length or the maximum circumferential length of the pin portion 32 shorter than the maximum circumferential length of the wing portion 30. The deformation of the pin portion 32 due to the input from the road surface received by the wing portion 30 can be effectively suppressed.

As described above, by arranging the sprocket engaging portion 24 around the entire circumference of the second through hole 34, the contact area of the portion where the pin portion 32 contacts increases, and the second through hole 34 is worn away. Can be suppressed.
Further, since the pair of guide wall portions 26 are connected by the sprocket engaging portion 24, the interval between the pair of guide wall portions 26 and the hole positions of the pair of guide wall portions 26 are maintained.

  Therefore, the cored bar 20 of the present embodiment can be coupled by a simple operation without increasing the number of dedicated parts for coupling, and the cored bar coupling part (the inner wall of the first through hole 36 and the inner wall of the second through hole 34) Abrasion can be effectively suppressed. As a result, the durability of the cored bar 20 is improved.

  As described above, the crawler belt 13 is configured by connecting the cored bar 20 that can be connected by a simple operation without increasing the number of dedicated connecting parts and can suppress wear of the cored bar connecting part. Therefore, the productivity of the rubber crawler 10 is improved, and the wear of the cored bar connecting portion is suppressed, and the durability of the rubber crawler 10 is improved.

In the first embodiment described above, as shown in FIGS. 6 and 7, the circumferential end portion 30 </ b> A of the wing portion 30 is accommodated in the groove portion 36 </ b> A of the first through hole 36, but the present invention is limited to this configuration. Instead, as shown in FIGS. 10A and 10B, the protrusion 40 </ b> A of the wing part 40 having the protrusion 40 </ b> A formed at the root portion is accommodated in the groove 36 </ b> A of the first through hole 36. Also good. The connecting member 38 having the wing portion 40 is an example of the connecting member of the present invention.
The shape of the groove portion 36A is particularly limited as long as at least a part of the wing portion can be accommodated, such as a shape in which the circumferential end portion 30A of the wing portion 30 is accommodated or a shape in which the protrusion 40A of the wing portion 40 is accommodated. Don't do it. For example, the shape of the groove may be a substantially semicircular shape or a substantially triangular shape.

[Second Embodiment]
Hereinafter, a second embodiment of a core bar for a crawler of the present invention and a rubber crawler using the same will be described. In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

11 and 12 show a cored bar 50 according to the second embodiment.
As shown in FIGS. 11 and 12, the cored bar body 22 protrudes in the width direction from the outer surface in the width direction of the wide wall portion 26A of the guide wall portion 26 and extends in the circumferential direction toward the narrow wall portion 26B. 52. Specifically, the reinforcing rib 52 extends from the first through hole 36 to the second through hole 34. The reinforcing rib 52 is formed integrally with the guide wall portion 26.

  As shown in FIGS. 11 and 12, a part of the reinforcing rib 52 is formed along the first through hole 36 and the groove portion 36 </ b> A, and is formed along the second through hole 34. In addition, it is preferable to set the protrusion amount of the reinforcing rib 52 in the width direction as appropriate.

Next, the effect of the metal core 50 and the rubber crawler 46 according to the second embodiment will be described.
By forming the reinforcing ribs 52 on the guide wall portion 26, the durability of the guide wall portion 26 against the shearing force caused by the circumferential tension acting on the connected core metal 50 is improved. In particular, as in the guide wall portion 26 of the present embodiment, when the widthwise direction interval between the wide wall portion 26A and the narrow wall portion 26B is different, the connection that connects the wide wall portion 26A and the narrow wall portion 26B. Since stress tends to concentrate on the wall portion 26C, the durability improving effect by the reinforcing rib 52 is effectively exhibited. Moreover, compared with the case where the thickness of the whole guide wall part 26 is simply increased and durability is improved, durability can be improved, suppressing a weight increase.

Also, as shown in FIG. 12, since a part of the reinforcing rib 52 is formed along the shape of the first through hole 36 and the groove portion 36A, the first through hole 36 and the groove portion 36A that receive tension when the crawler travels. Is reinforced. This effectively suppresses deformation of the first through hole 36 and the groove portion 36A due to the tension during crawler travel.
Similarly, since a part of the reinforcing rib 52 is formed along the shape of the second through hole 34, the contact area between the second through hole 34 and the pin portion 32 becomes larger, and the second through hole 34. Is more effectively suppressed.

  In the second embodiment described above, the reinforcing rib 52 is formed on the outer side surface in the width direction of the guide wall portion 26. However, the present invention is not limited to this configuration, and the reinforcing rib 52 has the width of the guide wall portion 26. It is good also as a structure formed in the direction inner side surface, and the structure in which the reinforcing rib 52 is formed in the width direction outer side surface and inner side surface of the guide wall part 26. FIG.

  In addition, although the metal cores 20 and 50 of the above-described embodiment are formed by integrally forming a metal material, the metal cores 20 and 50 are not limited to this, and may have sufficient strength and durability as the crawler belt 13. For example, the cored bars 20 and 50 may be resin molded products, or only a portion where strength is required may be a resin molded product using a metal material.

  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.

DESCRIPTION OF SYMBOLS 10 Rubber crawler 12 Rubber elastic body 13 Crawler belt 20 Core metal 22 Core metal main body 24 Sprocket engaging part (connection part)
26 Guide wall (inner peripheral projection)
28 connecting member 30 wing part 32 pin part (shaft part)
34 2nd through-hole 36 1st through-hole 36A Groove part 38 Connection member 46 Rubber crawler 50 Core metal 52 Reinforcement rib S Circumferential direction W Width direction IN Inner peripheral side OUT Outer peripheral side

Claims (7)

A cored bar for a crawler that is arranged at a constant interval in the circumferential direction, and that is adjacent to each other in the circumferential direction to form an endless crawler belt,
A pair of inner circumferential projections that are spaced apart from each other in the width direction of the crawler belt and project toward the inner circumferential side of the crawler belt and extend in the circumferential direction. A metal core body having a first through-hole penetrating to the second peripheral through-hole and a second through-hole penetrating in the width direction provided at a position spaced apart from the first through-hole in the inner circumferential side projection in the circumferential direction; ,
A connecting member that is inserted into the second through hole of the core metal body adjacent to the first through hole of the core metal body, and connects the core metal body adjacent to the core metal body;
With
The connecting member passes through the first through-hole and is disposed between the pair of inner peripheral protrusions, and extends from the both end portions of the shaft portion outward in the width direction. A pair of wings through the hole,
The inner wall of the first through hole is formed with a groove portion extending in the width direction on the opposite side to the second through hole and accommodating the circumferential end of the wing portion.
In a state where at least a part of the wing part is housed in the groove part, the shaft part overlaps the inner peripheral projection as viewed from the width direction, and the movement of the shaft part in the width direction is the axis. A core bar for a crawler that is regulated by contact between a portion and the inner peripheral protrusion.   The core metal for a crawler according to claim 1, wherein a maximum circumferential length of the shaft portion is longer than a maximum circumferential length of the wing portion.   The core metal main body is provided between the pair of inner peripheral projections and connects the pair of inner peripheral projections, and at least part of the connection portion is disposed along the second through hole. The metal core for crawlers of Claim 1 or Claim 2 which has. An interval between the pair of inner peripheral projections is narrower on the second through hole side than on the first through hole side,
In a state where the adjacent metal cores are connected to each other, on the first through hole side of the pair of inner peripheral projections of the metal core body, the second through holes of the pair of inner peripheral projections of the adjacent metal core bodies The cored bar for a crawler according to any one of claims 1 to 3, wherein the side is inserted.   The inner peripheral projection includes a reinforcing rib provided on at least one of the inner surface and the outer surface in the width direction, protruding in the width direction, and extending from the first through hole to the second through hole. Item 5. A crawler core bar according to Item 4.   The core metal for a crawler according to claim 5, wherein a part of the reinforcing rib is disposed along the first through hole and the groove portion.   A rubber crawler in which a rubber elastic body is disposed on an outer peripheral side of a crawler belt configured using the core for a crawler according to claim 1.

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