JP5871482B2 - Rubber crawler manufacturing method - Google Patents

Description

  The present invention relates to a rubber crawler manufacturing method and a rubber crawler to be mounted on, for example, a construction machine such as a hydraulic excavator, an agricultural machine, and other crawler type vehicles.

2. Description of the Related Art Conventionally, as a rubber crawler, an endless belt-shaped crawler body formed of a rubber material and a plurality of core bars arranged at intervals in the crawler circumferential direction on the crawler body, the core bar is a crawler body. The structure provided with the wing | blade part embed | buried under and the protrusion part which protrudes toward the inner peripheral surface side of a crawler main body from this wing | blade part is known.
Here, as a method of manufacturing this type of rubber crawler in which the wing portion and the protrusion of the cored bar are formed of different members, for example, a method as shown in Patent Document 1 below is known. . In this method, a pair of protrusions are provided on the rubber crawler, and these protrusions are connected to each other by a connecting part. Then, a cored bar is formed by connecting a piece formed by integrally forming the protrusion and the connecting part and the wing part with a bolt and a knock pin.

Japanese Utility Model Publication No. 5-65780

  However, in the conventional rubber crawler manufacturing method, bolts and dowel pins are used for connecting the one part and the wing part, and the number of parts is increased, and further, work such as cutting taps for bolts is required. Therefore, there is a problem that it takes time to manufacture.

  This invention is made | formed in view of the situation mentioned above, The objective is to provide the manufacturing method of the rubber crawler which can form a rubber crawler simply.

In order to solve the above problems, the present invention proposes the following means.
A rubber crawler manufacturing method according to the present invention includes an endless belt-shaped crawler body formed of a rubber material, and a plurality of core bars disposed on the crawler body at intervals in the crawler circumferential direction, The metal core is a method of manufacturing a rubber crawler that forms a rubber crawler that includes a wing portion embedded in the crawler body and a protrusion protruding from the wing portion toward the inner peripheral surface of the crawler body. Te, a connecting step of connecting the said wings wherein the projections, the connecting step, a convex portion provided on the projecting portion, the thickness of the crawler body the wings provided on the wings The convex portion is pressed against the inner wall surface of the concave portion by being caused to enter the concave portion penetrating in the vertical direction and compressing and deforming the convex portion in its axial direction to expand the diameter in the concave portion , and the convex portion The front end surface of the Characterized in that is positioned on the opening surface located on the outer peripheral surface of the over la body.

Further, the rubber crawler which is formed by the manufacturing method of a rubber crawler according to the present invention, the A blade portion and the projecting portion are connected by the convex portion is brought into pressure contact with the inner wall surface of said recess It is characterized by that.

  According to these inventions, in the connecting step, the convex portion is caused to enter the concave portion, and the convex portion is compressed and deformed in the axial direction to expand the diameter in the concave portion, whereby the convex portion is formed on the inner wall surface of the concave portion. Since the wing and the projection are connected to each other, the work such as tapping is reduced and the number of parts is reduced compared to the case where the wing and the projection are connected using, for example, a knock pin or a fastening member. Can be reduced, and a rubber crawler can be easily formed.

Further, in the manufacturing method of a rubber crawler according to the present invention, the connecting step, after the convex portions is advanced from the inner circumferential surface side of the crawler body in the recess, the protrusion from the outer peripheral surface of the crawler body You may compress-deform by pressing. In the connecting step, the tip may be pressed after the protrusion has entered the recess so that the tip of the protrusion protrudes from the recess toward the outer peripheral surface of the crawler body.

  In this case, in the connecting step, after the convex portion is made to enter the concave portion from the inner peripheral surface side of the crawler body, the convex portion is compressed and deformed by pressing the convex portion from the outer peripheral surface side of the crawler main body. It is not necessary to compress and deform the convex portion in the axial direction while entering. Therefore, for example, it is not necessary to cause the convex portion to enter the concave portion while pressing the convex portion against the inner wall surface of the concave portion, and the convex portion can smoothly enter the concave portion with a small force.

Further, a rubber crawler manufacturing method according to a reference example of the present invention includes an endless belt-like crawler body formed of a rubber material, and a plurality of core bars disposed on the crawler body at intervals in the crawler circumferential direction. The rubber core forms a rubber crawler comprising: a wing portion embedded in the crawler main body; and a protrusion protruding from the wing portion toward the inner peripheral surface of the crawler main body. The method includes a connecting step of connecting the wing portion and the protruding portion, wherein the connecting step includes a convex portion provided on one of the wing portion and the protruding portion on the other side. The convex portion is pressed against the inner wall surface of the concave portion by causing the convex portion to enter the concave portion and compressing and deforming the convex portion in the axial direction to expand the diameter in the concave portion. And the wings are connected to the black The connecting step penetrates the convex portion from the inner peripheral surface side of the crawler main body and then presses the convex portion from the outer peripheral surface side of the crawler main body. In the connecting step, the projecting portion is pushed into the recess so that the tip of the projecting portion protrudes from the recess toward the outer peripheral surface of the crawler body, and then the tip is pressed. By doing so, a crushing portion is formed, and a locking portion that locks the wing portion from the outer peripheral surface side of the crawler body is formed.

  In this case, since the locking portion is formed during the connecting step, the wing portion and the protruding portion can be firmly connected.

  The rubber crawler manufacturing method according to the present invention may include a member forming step of forming the wing portion by forging and forming the protrusion portion by casting.

In this case, since the wing part is formed by forging, it is possible to reduce the strength of the wing part and reduce the weight of the wing part even if the wing part is thin, compared to the case where the wing part is formed by casting, for example. Thus, the weight of the entire rubber crawler can be reduced.
In addition, even if the wing portion is thin, it is possible to suppress a decrease in strength of the wing portion, so that the thickness of the entire rubber crawler is maintained to be equal, while the wing portion is thinned while the crawler body is The thickness can be increased, and the durability of the rubber crawler can be improved.
In addition, since the protrusion is formed by casting, it can be formed with high precision even when the protrusion has a complicated shape, and the protrusion is formed by, for example, removing the base material. It becomes possible to form easily compared with the above, and it is possible to secure the degree of freedom in designing the projection.

Also, during the member forming process, the wing is formed by forging and the protrusion is formed by casting, so the protrusion and the wing are formed so that the hardness of the protrusion is lower than the hardness of the wing. can do.
Here, when the protrusion is provided on the protrusion, when the protrusion is compressed and deformed in the axial direction, stress is generated in the protrusion, and the protrusion is easily damaged.
However, by making the hardness of the protrusions lower than the hardness of the wings as described above, it becomes possible to relieve stress generated in the protrusions when compressing and deforming the protrusions, and damage the protrusions. And a high-quality rubber crawler can be formed.

  Moreover, in the manufacturing method of the rubber crawler which concerns on this invention, you may have the heat processing process which heat-processes the connection body of the said wing | blade part and the said projection part.

  In this case, since the heat treatment step is included, the mechanical properties of the core metal can be adjusted after the connecting step, for example, by improving the hardness and strength of the wing and the protrusion.

In addition, since the hardness of the protruding portion can be improved after the connecting step, the hardness of the protruding portion can be kept lower than that of the protruding portion in the product state during the connecting step.
Here, when the protrusion is provided on the protrusion, when the protrusion is compressed and deformed in the axial direction, stress is generated in the protrusion, and the protrusion is easily damaged.
However, by keeping the hardness of the protrusions low as described above, it is possible to relieve the stress generated in the protrusions when compressing and deforming the protrusions, and to prevent damage to the protrusions. A quality rubber crawler can be formed.

  According to the present invention, a rubber crawler can be easily formed.

It is a longitudinal cross-sectional view of the rubber crawler which concerns on one Embodiment of this invention. It is a longitudinal cross-sectional view of the metal core which comprises the rubber crawler shown in FIG. 1, Comprising: It is a longitudinal cross-sectional view along the direction different from the longitudinal cross-sectional view shown in FIG. It is one process figure explaining the manufacturing method of the rubber crawler which forms the rubber crawler shown in FIG. It is one process figure explaining the manufacturing method of the rubber crawler which forms the rubber crawler shown in FIG. It is one process figure explaining the manufacturing method of the rubber crawler which concerns on one modification of this invention. FIG. 6 is a process diagram illustrating a method for manufacturing the rubber crawler shown in FIG. 5. It is a longitudinal cross-sectional view of the metal core with which the rubber crawler formed by the manufacturing method of the rubber crawler which concerns on one modification of this invention is provided. It is a longitudinal cross-sectional view of the metal core with which the rubber crawler formed by the manufacturing method of the rubber crawler which concerns on one modification of this invention is provided.

Hereinafter, a rubber crawler according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the rubber crawler 20 includes an endless belt-like crawler body 21 formed of a rubber material, a plurality of core bars 22 disposed on the crawler body 21 at intervals in the crawler circumferential direction L, It has.
A plurality of lugs 23 project from the outer peripheral surface 21 b of the crawler body 21.
The cored bar 22 is disposed with a wing portion 25 embedded in the crawler main body 21, projecting from the wing portion 25 toward the inner peripheral surface 21 a side of the crawler main body 21, and spaced apart from each other in the crawler width direction H. A pair of protrusions 26.

  The wing portion 25 extends along the crawler width direction H, and the pair of protrusions 26 are disposed at the center of the wing portion 25 in the crawler width direction H. In the crawler main body 21, the crawler peripheral portion 21 b is closer to the outer peripheral surface 21 b of the crawler main body 21 than the wing portion 25, and is located on the outer side of the crawler main body 21 along the crawler width direction H from the protrusion 26. A pair of steel cord layers 27 extending continuously in the direction L are embedded.

  The protrusion 26 is covered with a rubber film 32 formed integrally with the crawler body 21. As shown in FIGS. 1 and 2, each top surface 26a of the plurality of protrusions 26 extends along both the crawler width direction H and the crawler circumferential direction L. These top surfaces 26a are A pair of left and right wheel passing surfaces S that continuously extend over the entire circumference in the crawler circumferential direction L are configured. On the wheel passing surface S, a wheel (not shown) is rolled in accordance with the feed movement along the crawler circumferential direction L of the rubber crawler 20.

  Here, the wing portion 25 and the projection portion 26 are configured as separate members, and the cored bar 22 is configured by connecting the wing portion 25 and the projection portion 26. The protrusion 26 is integrally provided with a convex portion 35 that protrudes toward the outer peripheral surface 21 b of the crawler main body 21, and the wing portion 25 has a concave portion 33 that opens toward the inner peripheral surface 21 a of the crawler main body 21. The wing part 25 and the projection part 26 are connected by the convex part 35 being disposed in the concave part 33 and being brought into pressure contact with the inner wall surface 33 a of the concave part 33.

A pair of the recessed portions 33 is disposed in a portion corresponding to the protruding portion 26 in the central portion of the wing portion 25 in the crawler width direction H. The concave portion 33 penetrates the wing portion 25 in the thickness direction T of the crawler main body 21.
FIG. 1 and FIG. 2 are schematically drawn, and the tip surface of the convex portion 35 is located on the opening surface located on the outer peripheral surface 21b side of the crawler main body 21 in the concave portion 33, or the convex portion 35. However, although it press-contacts over the whole inner wall surface 33a of the recessed part 33, it is not restricted to these.

Next, the manufacturing method of the rubber crawler comprised as mentioned above is demonstrated.
First, a member forming step is performed in which the wing portion 25 is formed by forging and the protruding portion 26 is formed by casting. At this time, the wing portion 25 is formed by die forging using, for example, mild steel, hard steel, or alloy steel, and the protruding portion 26 is formed using, for example, cast iron, cast steel, copper alloy, or the like.
Thereby, the wing | blade part 25 in which the recessed part 33 was provided, and the projection part 26 in which the convex part 35 was integrally provided with the same material are formed. The wings 25 and the protrusions 26 are so-called unheated raw materials that are not heat-treated, and the protrusions 26 and the protrusions 35 as raw materials have a Brinell hardness of about HB 120 to 250, for example. It is possible.

  In the wing portion 25 and the projection portion 26 formed as described above, the convex portion 35 is formed in a rectangular parallelepiped shape, and the cross-sectional view shape along both the crawler width direction H and the crawler circumferential direction L of the convex portion 35 is The rectangular shape is long in the crawler circumferential direction L. Further, the recess 33 is recessed in a rectangular parallelepiped shape, and the shape of the recess 33 in the cross-sectional view is a rectangular shape that is long in the crawler circumferential direction L.

Then, the connection process which connects the wing | blade part 25 and the projection part 26 is performed. At this time, the convex portion 35 provided in the projection 26 is caused to enter the concave portion 33 provided in the wing portion 25, and the convex portion 35 is compressed and deformed in the axial direction to expand the diameter in the concave portion 33. As a result, the convex portion 35 is pressed against the inner wall surface 33 a of the concave portion 33.
Here, in the present embodiment, at the time of this connecting step, first, as shown in FIGS. 3 and 4, the convex portion 35 is caused to enter the concave portion 33 from the inner peripheral surface 21 a side of the crawler body 21, and the tip portion of the convex portion 35. 35a is protruded from the recessed part 33 to the outer peripheral surface 21b side of the crawler main body 21. At this time, the outer diameter of the convex portion 35 is smaller than the inner diameter of the concave portion 33, that is, the sizes of the convex portion 35 along both the crawler width direction H and the crawler circumferential direction L are larger than the respective sizes of the concave portion 33. It is small and the convex part 35 can be smoothly entered into the concave part 33.
Thereafter, in a state where the detachment of the convex portion 35 from the concave portion 33 is restricted, the tip portion 35a of the convex portion 35 is pressed from the outer peripheral surface 21b side of the crawler body 21 using, for example, a pressing jig (not shown). Then, the convex portion 35 is compressed and deformed in the axial direction to expand its diameter, and is brought into pressure contact with the inner wall surface 33 a of the concave portion 33.
The connection process is thus completed.

  And the heat treatment process which heat-processes the coupling body of the wing | blade part 25 and the projection part 26 is performed, and the mechanical property of the metal core 22 is adjusted, such as improving each hardness and each intensity | strength of the wing | blade part 25 and the projection part 26, for example. . By this heat treatment, the hardness of the wing portion 25 can be set to, for example, about HRC 20 to 55 in terms of Rockwell hardness, and the hardness of the protruding portion 26 can be set to, for example, about HB 250 to 500 in terms of Brinell hardness.

  After forming the cored bar 22 as described above, the cored bar 22, the steel cord layer 27, and a plurality of rubber layers (not shown) to be the crawler body 21 are laminated to each other to form a rubber crawler molded body (not shown). After that, the rubber crawler 20 is formed by vulcanizing the molded body.

  As described above, according to the rubber crawler manufacturing method and the rubber crawler 20 according to the present embodiment, during the connecting step, the convex portion 35 is caused to enter the concave portion 33 and the convex portion 35 is moved in the axial direction thereof. By compressing and deforming and expanding the diameter in the concave portion 33, the convex portion 35 is pressed against the inner wall surface 33a of the concave portion 33, and the wing portion 25 and the protruding portion 26 are connected. For example, using a knock pin or a fastening member Compared with the case where the wing portion 25 and the projection portion 26 are connected, it is possible to reduce the number of parts while reducing the work such as cutting taps, and the rubber crawler 20 can be easily formed.

  Further, in the connecting step, the convex portion 35 is caused to enter the concave portion 33 from the inner peripheral surface 21a side of the crawler main body 21, and then the convex portion 35 is pressed by pressing the convex portion 35 from the outer peripheral surface 21b side of the crawler main body 21. Since the compressive deformation is performed, the convex portion 35 may not be compressed and deformed in the axial direction while the convex portion 35 enters the concave portion 33. Therefore, for example, the convex portion 35 does not need to enter the concave portion 33 while pressing the convex portion 35 against the inner wall surface 33a of the concave portion 33, and the convex portion 35 can be smoothly entered into the concave portion 33 with a small force. .

In addition, since the wing portion 25 is formed by forging, for example, compared to the case where the wing portion 25 is formed by casting, even if the wing portion 25 is thin, a decrease in strength of the wing portion 25 is suppressed, and the wing portion 25 is reduced in weight. It is possible to reduce the weight of the entire rubber crawler 20.
Further, even if the wing portion 25 is made thin, a decrease in the strength of the wing portion 25 can be suppressed, so that the thickness of the wing portion 25 is reduced while maintaining the same thickness of the entire rubber crawler 20. Thus, the crawler body 21 can be made thicker, and the durability of the rubber crawler 20 can be improved.
Further, since the protrusion 26 is formed by casting, it can be formed with high precision even when the protrusion 26 has a complicated shape, and the protrusion 26 can be formed by removing the base material, for example. It can be formed more easily than the case where it is formed, and the degree of freedom in designing the protrusion 26 can be ensured.

Further, during the member forming step, the wing portion 25 is formed by forging and the projection portion 26 is formed by casting. Therefore, the projection portion 26 and the projection portion 26 and the hardness of the wing portion 25 are set to be lower than the hardness of the wing portion 25. The wing part 25 can be formed.
Here, as in the present embodiment, when the protrusion 35 is provided on the protrusion 26, stress is generated in the protrusion 26 when the protrusion 35 is compressed and deformed in the axial direction, and the protrusion 26 is It becomes easy to damage.
However, by making the hardness of the projection 26 lower than the hardness of the wing portion 25 as described above, it becomes possible to relieve the stress generated in the projection 26 when the projection 35 is compressed and deformed. It is possible to form a high-quality rubber crawler 20 by suppressing the damage to 26.

Moreover, since it has the said heat processing process, the mechanical property of the metal core 22 can be adjusted, for example, improving each hardness and each intensity | strength of the wing | blade part 25 and the projection part 26 after a connection process.
Further, since the hardness of the protrusion 26 can be improved after the connecting step, the hardness of the protrusion 26 can be kept lower than that of the protrusion 26 in the product state during the connecting step. it can. As a result, it is possible to further relieve the stress generated in the projection 26 when the convex portion 35 is compressed and deformed in the axial direction thereof, and to prevent the projection 26 from being damaged, and to further improve the quality of the rubber crawler 20. Can be formed.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, FIGS. 1 to 4 shown in the above embodiment are schematically drawn, and the inner wall surface 33a of the recess 33 is along the thickness direction T in a longitudinal sectional view along the thickness direction T. Although extending linearly, it is not limited to this. For example, as shown in FIGS. 5 and 6, in the connecting step, the concave portion 33 has a minimum inner diameter at the center in the thickness direction T and gradually increases in diameter toward both outer sides in the thickness direction T. May be.

Further, the rubber crawler 20 may include cored bars 40 and 50 as shown in FIGS. 7 and 8 instead of the cored bar 22.
7 is provided with a locking portion 41 that locks the wing portion 25 from the outer peripheral surface 21b side of the crawler main body 21. As shown in FIG. The locking portion 41 is formed by being crushed by pressing the tip portion 35a of the convex portion 35 during the connecting step. Thereby, the wing | blade part 25 and the projection part 26 can be connected firmly. In the illustrated example, the locking portion 41 is engaged with the opening peripheral edge portion of the concave portion 33 on the surface of the wing portion 25 facing the outer peripheral surface 21 b side of the crawler body 21.
Further, like the metal core 50 shown in FIG. 8, the locking portion 41 is located closer to the inner peripheral surface 21 a side of the crawler main body 21 than the opening surface located on the outer peripheral surface 21 b side of the crawler main body 21 in the concave portion 33. It may be. In the illustrated example, the inner wall surface 33 a of the recess 33 is located on the outer peripheral surface 21 b side of the crawler main body 21 and the end portion on the outer peripheral surface 21 b side connected to the opening surface faces the outer peripheral surface 21 b side of the crawler main body 21. The diameter gradually increases in accordance with this, and the locking portion 41 is locked to this end portion.

Moreover, in the said embodiment, although the convex part 35 shall be entered into the recessed part 33 so that the front-end | tip part 35a of the convex part 35 may protrude in the outer peripheral surface 21b side of the crawler main body 21 from the recessed part 33 in the connection process, The part 35a may not protrude.
Furthermore, in the said embodiment, although the recessed part 33 shall penetrate the wing | blade part 25 in the said thickness direction T, it is not restricted to this, For example, the non-penetrating opening opened toward the inner peripheral surface side of a crawler main body It may be a shape. In this case, for example, the convex portion can be compressed and deformed in the axial direction by pressing the tip portion of the convex portion against the bottom surface of the concave portion while the convex portion enters the concave portion.

Moreover, the convex part 35 may not be a rectangular parallelepiped shape, but may be, for example, a cylindrical shape, and the concave part 33 may be recessed, for example, in a cylindrical shape instead of being recessed in a rectangular parallelepiped shape.
Furthermore, in the said embodiment, while the recessed part 33 was provided in the wing | blade part 25, and the convex part 35 was provided in the projection part 26, it is not restricted to this, While the recessed part 33 is provided in the projection part 26, A convex portion 35 may be provided on the wing portion 25. That is, during the connecting step, the convex portion provided on one of the wing portion and the projecting portion is caused to enter the concave portion provided on the other, and the convex portion is compressed and deformed in the axial direction to expand the diameter in the concave portion. By doing so, it is possible to appropriately change to another configuration in which the convex portion is pressed against the inner wall surface of the concave portion.

Further, there is no need for a heat treatment step.
Furthermore, in the said embodiment, in the member formation process, while the wing | blade part 25 was formed by forge and the projection part 26 was formed by casting, it is not restricted to this.
Furthermore, it is possible to reduce the weight of the cored bar 22 by forming the protruding portion 26 with a light weight metal having a specific gravity higher than that of the material forming the wing portion 25. Examples of the light weight metal include aluminum and aluminum alloys. In addition, the hardness of aluminum is about Hv30-130 in Vickers hardness, for example.

Further, the steel cord layer 27 and the rubber film 32 may be omitted.
Furthermore, in the said embodiment, although the wheel passing surface S shall be comprised by the top surface 26a of the projection part 26, it is not restricted to this. For example, the wheel passing surface S may be formed on the inner peripheral surface side of the crawler main body at a portion located on the outer side in the crawler width direction than each protrusion of the cored bar.

  Further, the cored bar may be provided with a derailment prevention mechanism that regulates relative displacement between the cored bars adjacent to each other in the crawler circumferential direction in the crawler width direction. As an example of the derailment prevention mechanism, a first mechanism that protrudes from the core bar toward one side in the crawler circumferential direction and is located inside the crawler main body along the crawler width direction, and the other one in the crawler circumferential direction from the core bar And a second mechanism located on the outer side of the crawler body along the crawler width direction, and the first mechanism and the second mechanism between the core bars adjacent in the crawler circumferential direction are crawlers. The structure which opposes in the width direction etc. are mentioned.

  Moreover, in the said embodiment, although the metal core 22 shall be provided with a pair of projection part 26, it is not restricted to this, For example, one projection part is a center part of the crawler width direction in a wing | blade part. The structure provided for may be sufficient.

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

20 Rubber Crawler 21 Crawler Main Body 21a Inner Peripheral Surface 21b Outer Peripheral Surface 22, 40, 50 Core Bar 25 Wing 26 Protrusion 33 Recess 33a Inner Wall 35 Protrusion 35a Tip 41 Locking Section L Crawler Circumferential Direction T Thickness Direction

Claims (5)

An endless belt-shaped crawler body made of rubber material;
A plurality of metal cores disposed at intervals in the crawler circumferential direction on the crawler body,
The metal core is a rubber crawler manufacturing method that forms a rubber crawler that includes a wing portion embedded in the crawler main body and a protrusion protruding from the wing portion toward the inner peripheral surface of the crawler main body. There,
A connecting step of connecting the wing portion and the protruding portion;
The connecting step, compressing the convex portion provided on the projecting portion, a convex portion with advancing the said wings provided on the wings in a recess penetrating in a thickness direction of the crawler body in the axial direction By deforming and expanding the diameter in the concave portion, the convex portion is pressed against the inner wall surface of the concave portion , and the front end surface of the convex portion is located on the outer peripheral surface side of the crawler body in the concave portion. A method for producing a rubber crawler, characterized by being positioned on a surface . A method for producing a rubber crawler according to claim 1 ,
The connecting step is characterized by compressing and deforming the convex portion by pressing the convex portion from the outer peripheral surface side of the crawler body after the convex portion enters the concave portion from the inner peripheral surface side of the crawler main body. Rubber crawler manufacturing method. A method for producing a rubber crawler according to claim 2,
The connecting step is characterized in that, after the convex portion is entered into the concave portion so that the distal end portion of the convex portion projects from the concave portion toward the outer peripheral surface side of the crawler body, the distal end portion is pressed. Rubber crawler manufacturing method. A method for producing a rubber crawler according to any one of claims 1 to 3,
A method for producing a rubber crawler, comprising a member forming step of forming the wing portion by forging and forming the protruding portion by casting. A method for producing a rubber crawler according to any one of claims 1 to 4,
A method of manufacturing a rubber crawler, comprising a heat treatment step of heat treating a connection body of the wing portion and the projection portion.

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