JP3349007B2 - Core metal for elastic crawler, method of manufacturing the same, and elastic crawler using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core metal of an elastic crawler used for agriculture, civil engineering and the like, a method of manufacturing the same, and an elastic crawler using the same.

[0002]

2. Description of the Related Art Generally, an elastic crawler has a core metal embedded in a crawler body made of an elastic material at a circumferential interval and a tensile member in a circumferential direction embedded on an outer peripheral side of the core metal. The crawler body is formed with an engaging hole for engaging a drive wheel, and a lug is integrally protruded from the outer peripheral surface of the crawler body. The core metal has a halfway part in which wheels such as drive wheels are involved and wings on the left and right sides thereof, and each of the left and right wings is gradually thinner in the vertical direction from the halfway side to the left and right outer end sides, A pair of right and left protrusions protrude to the inner peripheral side of the crawler in the middle part, and there is also a metal core which is not provided with the protrusions.

[0003] Such a core metal is formed by casting or forging, is heavy, and is desired to be reduced in weight. Japanese Unexamined Patent Publication (Kokai) No. 5-178243 discloses that only the inside of the projection is provided. Is disclosed.

[0004]

In the above prior art, the weight of the projection can be reduced, but the weight of the other portions cannot be reduced, and the shape and material that can be formed by drawing are limited. An object of the present invention is to provide a core metal for an elastic crawler in which at least a wing part among a middle part and a wing part of a core metal is made hollow to reduce the weight of the core metal. The present invention provides a method for manufacturing a metal core for an elastic crawler, which can easily and inexpensively manufacture a metal core by pressing both ends of a metal cylinder to form wings. The purpose is to:

It is an object of the present invention to provide a lightweight elastic crawler by embedding a core metal having at least a hollow wing portion in a crawler body made of an elastic material at a circumferential interval.

[0006]

A first concrete means for solving the problem in the present invention is a wheel, such as a drive wheel 3, which is embedded in a crawler body 2 made of an elastic material at a circumferential interval. In the core metal for an elastic crawler having the halfway part 4 and the left and right wing parts 5 involved, the halfway part 4 and the left and right wing parts 5 are formed by pressing at least the left and right wing parts 5 into a cylindrical body.
That is, it is formed in an internal hollow having upper and lower walls and front and rear walls . A second specific means for solving the problem in the present invention is to provide a crawler body 2 made of an elastic material with a circumferential interval.
And is buried in the vehicle, and the wheels such as the drive wheel 3 are involved.
Elastic crawler core having an intermediate portion 4 and left and right wing portions 5
In the gold, the middle part 4 and the left and right wing parts 5 are at least
The left and right wings 5 are formed to be hollow inside, and the left and right wings 5 have upper and lower walls 5A and 5B and front and rear walls 5C and 5D. 5A is inclined so as to gradually approach the lower wall 5B, and the front and rear walls 5C, 5D
Are substantially parallel and the upper edge thereof gradually projects upward from the upper wall 5A.

A third concrete means for solving the problem in the present invention is to provide a crawler body 2 made of an elastic material with a circumferential gap.
And buried in it, involving wheels such as drive wheels 3
For an elastic crawler having a middle part 4 and left and right wing parts 5
In the metal core, the halfway portion 4 and the left and right wing portions 5 are at least
The left and right wings 5 are also formed to be hollow inside, and the left and right wings 5 have upper and lower walls 5A and 5B and front and rear walls 5C and 5D,
The upper wall 5A is inclined such that the upper wall 5A gradually approaches the lower wall 5B from the middle portion 4 to the outer end of the wing portion 5, and the upper and lower walls 5
A and 5B are that the front and rear widths are gradually widened.

A fourth concrete means for solving the problem in the present invention is that in addition to any one of the first to third concrete means, the left and right wing portions 5 have holes 6 communicating with the inside at the outer ends. Is formed. According to a fifth specific means for solving the problem in the present invention, in addition to any one of the first to fourth specific means, lower walls 5B of the left and right wing portions 5 are formed substantially flat. That is. A sixth specific means for solving the problem in the present invention is that, in addition to any one of the first to fifth specific means, the middle part 4 has a hollow inside and a substantially elliptical cross section or a flat lower surface. That is, it is formed in a substantially semicircular cross section.

According to a seventh concrete means for solving the problem in the present invention, in addition to the sixth concrete means, the intermediate part 4 has a metal or non-metal auxiliary core material 7 inserted therein. That is being done. An eighth specific means for solving the problem in the present invention is a pair of left and right protrusions projecting upward at the left and right ends of the halfway part 4 in addition to any one of the first to seventh specific means. A projection 9 is formed, and the projection 9 is formed to be hollow inside.

A ninth concrete means for solving the problem in the present invention is that, in addition to any one of the first to eighth concrete means, the midway portion 4 and the left and right wing portions 5 are formed as separate members. Formed and welded together. The tenth concrete means for solving the problem in the present invention is the ninth or the first means.
In addition to the specific means described above, the intermediate portion 4 is hollow inside and is formed with a rib 8 for dividing the inside into a plurality of front and rear portions. Eleventh solution to the problem of the present invention
A specific means is that, in addition to the ninth specific means, a pair of left and right protrusions 9 protruding upward is provided at the left and right ends of the intermediate portion 4.
Are integrally formed.

A first solution for solving the problem in the method of the present invention.
The concrete means is to cut a metal tubular material into required dimensions to form a tubular material 12, leave the middle part 4 of the tubular material 12 only in required dimensions, and make the left and right sides thinner toward the outer end side. That is, the wing portion 5 is formed by pressing. A second specific means for solving the problem in the method of the present invention is that, in addition to the first specific means, a reinforcing material 7 is inserted into the intermediate portion 4 before the left and right side portions are pressed. That is.

A third solution to the problem in the method of the present invention.
The concrete means is that, in addition to the first or second concrete means, a metal thin plate is folded in two to form a projection material 13, and this projection material 13 is welded to the left and right ends of the intermediate portion 4 to form a projection portion. 9
Is formed. A fourth specific means for solving the problem in the method of the present invention is that the intermediate member 1 is made of a metal material.
4 and press-working the metal cylindrical member so as to become thinner from one end to the other end to form a wing member 15. Is welded.

A fifth aspect of the present invention for solving the problem in the method.
The concrete means of the present invention is characterized in that, in addition to the fourth concrete means, the metal material intermediate member 14 is formed of a pipe material, a drawn material having a rib inside, a bent material obtained by bending a flat plate, a forged product or a cast product. It is formed of either. A specific means for solving the problem in the present invention is that the core 1 is embedded in the crawler main body 2 made of an elastic material at a circumferential interval, and is embedded in the crawler main body 2 on the outer peripheral side of the core 1. A pair of left and right circumferential tensile members 18 are buried, and an engagement hole 16 is formed between the left and right tensile members 18 and between the metal cores 1 to engage the drive wheel 3. Engagement hole 16
The lugs 17 are integrally formed therebetween.

[0014]

The core metal 1 embedded in the crawler body 2 made of an elastic material at a circumferential interval has at least the left and right wing portions 5 of the middle portion 4 and the left and right wing portions 5 formed therein to be hollow. And the weight is further reduced by forming the middle part 4 to be hollow. The core metal 1 is formed hollow inside by simply cutting a metal cylindrical material to a required size and pressing both sides thereof so as to become thinner toward the outer end.

The cored bar 1 is made of a crawler body 2 made of an elastic material.
When the elastic crawler 20 is formed by embedding the elastic crawler 20 at circumferential intervals, a hollow portion remains in the elastic crawler 20 to reduce the overall weight, and the upper edges of the front and rear walls 5C and 5D of the wing portion 5
If the protruding portion A is higher than A, or if a hole 6 communicating with the inside is formed at the outer end of the left and right wing portions 5, the elastic material forming the crawler main body 2 penetrates and the core metal 1 and the crawler main body 2 are connected. Increase strength.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. In the first embodiment shown in FIGS. 1 to 5, the elastic crawler 20 has a large number of cores 1A embedded in the crawler main body 2 formed at an equal interval in a circumferential direction in a crawler main body 2 formed of an elastic material such as rubber or synthetic resin. An engagement hole 16 with which the driving wheel 3 is engaged is formed in a middle portion in the left-right direction between the metal pieces 1A. And a lug 17 is integrally formed between the engaging holes 16 on the outer peripheral surface of the crawler body 2.

The metal core 1A is formed of a light metal such as steel, iron or aluminum alloy, and the intermediate portion 4 in which the wheel including the portion where the driving wheel 3 is engaged in opposition to the engagement hole 16 is involved.
And the left and right wings 5. The middle part 4 has left and right projections 9 protruding from both ends to the crawler inner peripheral side. The upper and lower walls are gradually thinner toward the end. Both ends of the intermediate portion 4 are also thin so as to be continuous with the wing portion 5. The middle part 4 and the left and right wing parts 5 are formed to be hollow inside, and the sectional shape of the middle part 4 is, as shown in FIG.
C and 4D are all horizontally long substantially elliptical arcs.

As shown in FIG. 4, the side wall shape of the left and right wing portions 5 is such that the lower wall 5B is flat, and the upper wall 5A gradually approaches the lower wall 5B from the midway portion 4 to the outer end of the wing portion 5. The front and rear walls 5C and 5D are projected so that they are substantially parallel and the upper edge thereof is higher than the upper wall 5A. That is, the left and right wing portions 5 are formed by pressing down the front and rear centers of the upper wall 5A with a press while regulating the front and rear widths of the elliptical pipe in section, flattening the lower wall 5B, and forming the front and rear walls 5C and 5D round.
The front and rear width of the entire length of the wing portion 5 is substantially uniform, and a hole 6 communicating with the hollow portion in the cored bar 1A is left at the center of the front and rear rounded portion.

The hole 6 of the wing portion 5 allows the material of the crawler body 2 to enter when the core bar 1A is buried in the crawler body 2, thereby increasing the bonding strength between the core bar 1A and the crawler body 2. Play a role. The protruding portion 9 is formed by punching a thin metal plate such as a steel plate or an iron plate, forming it into a square shape by using a mold and a press, such as bending and folding, and separately from other portions of the cored bar 1A. And is welded to the left and right ends of the middle part 4, and the inside is hollow,
It communicates with the outside through the groove 10. The material of the crawler body 2 can also enter from the groove 10.

As shown in FIG. 5, in the method of manufacturing the cored bar 1A, a metal cylinder having a substantially elliptical or circular cross section is cut into required dimensions to form a cylinder material 12 (first step). The tube material 12 is divided into three sections of a required length, and the center section is defined as a middle section 4,
The wings 5 are formed by pressing the left and right sides of the tubular material 12 so as to become thinner toward the outer ends, leaving the intermediate portion 4 of a required size, and forming the wings 5 (second step), and folding the plate material into two. To form a projection material 13 in a square shape (another process),
The projection material 13 of the projection 9 is welded to both ends of the intermediate portion 4 to form the projection 9 (third step).

In the second embodiment shown in FIGS. 6 to 8, the core 1B is hollow at all parts.
And the intermediate portion 4 and the projection 9 are the same, and only the shape of the wing portion 5 is different.
It can be manufactured by the same method as A. Left and right wings 5 are lower wall 5B
Is flat, the upper wall 5A is inclined so as to gradually approach the lower wall 5B from the midway portion 4 to the outer end of the wing portion 5, and the front and rear widths of the upper and lower walls 5A and 5B are gradually widened. 5C and 5D gradually become lower, and the upper edge projecting higher than the upper wall 5A is not formed.

The core bar 1B is simply pressed by a press so that both ends of the cylindrical material 12 are in contact with each other, and a hole 6 is formed at an end portion by post-processing. The third shown in FIGS.
The core bar 1C of the embodiment is the same as the core bar 1A, and a metal or non-metal auxiliary core 7 is inserted into the intermediate portion 4. The core material 7 is preferably made of a lightweight material such as a synthetic resin, and reinforces the intermediate portion 4 and maintains the shape during molding without increasing the weight. The core bar 1C of the third embodiment
As shown by a two-dot chain line in FIG. 5, the auxiliary core material 7 is separately formed, and after the first step, the auxiliary core material 7 is inserted into the central section of the tubular material 12, and in this state, the second auxiliary material 7 is inserted. It can be manufactured by performing the steps and the third step.

In each of the above embodiments, the lower wall 5B of the wing portion 5 is formed flat, but the lower wall 4B of the intermediate portion 4 can also be formed substantially flat. If this is done, molding becomes easier. Then, as shown in FIG. 11, the upper wall 4A can be formed into an arc shape, and the cross-sectional shape of the intermediate portion 4 can be made substantially semicircular. If the curvature of the upper arc wall 4A is adapted to the tooth valley shape of the driving wheel 3, the driving force can be transmitted smoothly. 12 and 13 show a fourth embodiment, in which a metal core 1D is formed by separately forming an intermediate portion 4, a left and right wing portion 5, and a left and right protrusion 9 and fixing them by welding.

In the manufacture of the cored bar 1D, the intermediate portion 4 is formed by pressing a tubular member into a rectangular tubular intermediate member 14 and the wing portion 5 is formed.
Is formed on the wing member 15 by pressing with a cylindrical member or a press so as to become thinner from one end to the other end in the same manner as in the first or second embodiment. The wing member 15 is welded to both ends of the rectangular tube of the intermediate member 15, and the cross plate 1 is attached to both ends of the intermediate member 15.
6 is welded. The intermediate member 14 forming the intermediate portion 4 of the fourth embodiment is replaced with a tubular member, as shown in FIG.
As shown in FIGS. 4 and 15, a drawn material having ribs 8 for dividing the inside into two or three cavities in the front and rear may be used. Alternatively, as shown in FIGS. ,
For example, it is possible to use a bent material in which both edges are opposed or rounded.

FIG. 18 shows a fifth embodiment. This core 1E has a halfway portion 4 and a left and right projection 9 integrally formed by forging or casting, etc., and the left and right wing portions 5 are formed in the fourth embodiment. Core 1
Like D, it is formed by pressing a cylinder or the like. A spigot is formed on each of the left and right ends of the intermediate part 4 by a projection 22 to position the member forming the wing part 5 when welding. In the core metal 1E of the fifth embodiment, the inside of the halfway portion 4 and the projection 9 is formed solid, but as shown by the two-dot chain line, the inside of the hollow is opened at the connection portion with the wing portion 5. It is also possible to form.

The cores 1B to 1E of the second to fifth embodiments are also
Like the cored bar 1A, the elastic crawler 20 can be configured by being embedded in the crawler body 2 made of an elastic material at a circumferential interval. Although the protrusion 9 in each of the above embodiments is shown for preventing wheel removal, in the case of a crawler device provided with a straddling wheel, the top surface of the protrusion 9 of the cored bar 1 is flat. Used by forming on the passage surface. In addition, when the elastic crawler 20 is formed by integrally forming small protrusions projecting back and forth on the protrusions 9, the small protrusions of the adjacent metal cores 1 are arranged so as to overlap in the circumferential direction. The protrusion of the cored bar 1 may be prevented from swinging in the left-right direction. Further, in the case of a crawler device that does not require the projection 9, the cored bar 1 is composed of only the halfway portion 4 and the wing portion 5.

[0027]

According to the present invention described in detail above, at least the middle part 4 and the left and right wing parts 5 of the cored bar 1 are cylindrical bodies.
Is pressed to form an inner hollow having upper and lower walls and front and rear walls, so that the weight can be reduced by the volume of the hollow, and the weight and cost can be reduced. The left and right wings 5 are composed of upper and lower walls 5A and 5B and front and rear walls 5
C, 5D, and the upper wall 5A is inclined so as to gradually approach the lower wall 5B from the midway portion 4 to the outer end of the wing portion 5, and the front and rear walls 5C, 5D are substantially parallel and the upper edges thereof are formed. Since it is gradually projected upward from the upper wall 5A, the front-rear width of the wing portion 5 can be made substantially uniform over its entire length, the stiffness of the wing portion 5 can be increased, and when the wing portion 5 is embedded in the crawler body 2, the front-rear wall 5C, 5D Are caught by the crawler body 2 and the connection can be more reliably performed.

The left and right wings 5 have upper and lower walls 5A and 5B and front and rear walls 5C and 5D. The upper wall 5A gradually approaches the lower wall 5B from the middle 4 to the outer end of the wing 5. Since it is inclined and the front and rear widths of the upper and lower walls 5A and 5B are gradually widened, the thickness at the outer end of the wing portion 5 can be reduced, and the crawler on the wing portion 5 when embedded in the crawler body 2 The thickness of the main body 2 can be reduced. Since the left and right wings 5 are formed with holes 6 communicating with the inside at the outer ends, the elastic material of the crawler main body 2 can enter when embedded in the crawler main body 2, and the core metal 1 and the crawler main body 2 can be connected. Strength can be improved.

Since the lower walls 5B of the left and right wing portions 5 are formed substantially flat, when the tensile member 18 is buried in the crawler body 2 and the tensile member 18 is arranged on the outer peripheral side thereof, the tensile force from the metal core 1 is reduced. The stress applied to the body 18 can be reduced, and the durability of the tensile body 18 can be improved. Since the intermediate portion 4 is hollow inside and has a substantially elliptical cross section or a substantially semicircular cross section with a flat lower surface, the driving wheel 3
Can smoothly engage with the tooth valley. Midway 4
Since the metal or non-metal auxiliary core material 7 is inserted in the inside, the strength of the halfway portion 4 can be improved, and the shape can be maintained when the wing portion 5 is formed.

A pair of left and right protrusions 9 projecting upward is formed at the left and right ends of the intermediate part 4.
Is formed hollow inside, so that the weight of the cored bar 1 can be further reduced. Since the halfway portion 4 and the left and right wing portions 5 are formed as separate members and welded to each other, the halfway portion 4 can be formed into various shapes in addition to the cylindrical shape.
Since the middle portion 4 is hollow inside and is formed with a rib 8 for dividing the inside into a plurality of front and rear portions, the middle portion 4 can be formed with a light weight and high strength.

The left and right ends of the intermediate portion 4 are integrally formed with a pair of left and right projections 9 projecting upward, so that the formation of the projections 9 is simplified. A metal cylinder material is cut into required dimensions to form a cylinder material 12, and left and right sides of the cylinder material 12 are pressed so that the left and right sides become thinner toward the outer ends, leaving only the required dimensions. Since the wing portion 5 is formed, the cored bar 1 can be formed easily and lightly from a cylindrical material. Before pressing the left and right side portions, a reinforcing material 7
Is inserted, the insertion of the auxiliary core material 7 and the molding using the same can be easily performed.

A metal thin plate is folded in two to form a projection material 13.
Is formed, and the projection material 13 is welded to the left and right ends of the intermediate portion 4 to form the projection 9, so that the projection 9 can be formed easily and lightly. The intermediate member 14 is formed of a metal material, and the metal tubular member is pressed so as to become thinner from one end to the other end to form the wing member 15, and the intermediate member 1 is formed.
Since the thicker ends of the pair of left and right wing members 15 are welded to both ends of the core 4, the metal core 1 having the intermediate portions 4 of various shapes can be easily manufactured.

The intermediate member 14 made of a metal material is formed of any one of a pipe material, a drawn material having a rib inside, a bent material obtained by bending a flat plate, a forged product, or a cast product. It can be formed into various materials and shapes,
The required strength can be easily manufactured. The elastic crawler has one of the cores 1 embedded in the crawler body 2 made of an elastic material at a circumferential interval, and a pair of left and right circumferential tensile strengths is provided in the crawler body 2 on the outer peripheral side of the core 1. Body 18
An engaging hole 16 is formed between the left and right tensile members 18 and between the metal cores 1 so that the driving wheel 3 is engaged. A lug 17 is integrally formed between the engaging holes 16 on the outer peripheral surface of the crawler body 2. Because it is molded, it can be manufactured lightweight and inexpensively.

[Brief description of the drawings]

FIG. 1 is a cross-sectional front view of an elastic crawler having a core bar embedded therein according to a first embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a sectional side view of the metal core of the first embodiment.

FIG. 4 is a side view of the metal core of the first embodiment.

FIG. 5 is an explanatory view showing a method for manufacturing the cored bar of the first embodiment.

FIG. 6 is a front view showing a metal core of the second embodiment.

FIG. 7 is a plan view of the same.

FIG. 8 is a side view of the same.

FIG. 9 is a sectional front view showing a cored bar according to a third embodiment.

FIG. 10 is a sectional side view of the same.

FIG. 11 is a sectional side view showing a modified example of the cored bar of the third embodiment.

FIG. 12 is a front view showing a cored bar according to a fourth embodiment.

FIG. 13 is a plan view of the same.

FIG. 14 is a sectional view showing a first modification of the intermediate member of the core bar of the fourth embodiment.

FIG. 15 is a sectional view showing a second modification of the intermediate member of the core bar of the fourth embodiment.

FIG. 16 is a sectional view showing a third modification of the intermediate member of the core bar of the fourth embodiment.

FIG. 17 is a sectional view showing a fourth modification of the intermediate member of the core bar of the fourth embodiment.

FIG. 18 is a sectional front view showing a cored bar according to a fifth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core metal 2 Crawler main body 3 Drive wheel 4 Midway part 5 Wing part 6 Hole 7 Compensating material 8 Rib 9 Projection

──────────────────────────────────────────────────の Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B62D 55/24 B62D 55/253

Claims (17)

(57) [Claims] An intermediate part (4) which is embedded in a crawler body (2) made of an elastic material at a circumferential interval and includes wheels such as a drive wheel (3) and wings (5) on the left and right sides thereof. In the core for elastic crawlers having the following, at least the middle part (4) and the left and right wing parts (5) are formed by pressing a cylindrical body at least in the left and right wing parts (5) to form upper and lower walls and front and rear walls.
A core metal for an elastic crawler, wherein the metal core is formed in a hollow inside. 2. A crawler body (2) made of an elastic material has a circumferential direction.
It is buried at intervals, and wheels such as drive wheels (3)
It has an involved midway (4) and its left and right wings (5)
The middle part (4) and the left and right wing parts (5) are at least left and right.
The wing part (5) is formed hollow inside, and the left and right wing parts (5) have upper and lower walls (5A, 5B) and front and rear walls (5C, 5D), and extend from the middle part (4) to the wing part. (5)
As going to the outer end, the upper wall (5A) is inclined so as to gradually approach the lower wall (5B), and the front and rear walls (5C, 5D) are substantially parallel and the upper edges thereof gradually rise from the upper wall (5A). elastic crawler core metal characterized by being projected. 3. A crawler body (2) made of an elastic material has a circumferential direction.
It is buried at intervals, and wheels such as drive wheels (3)
It has an involved midway (4) and its left and right wings (5)
The middle part (4) and the left and right wing parts (5) are at least left and right.
The wing part (5) is formed hollow inside, and the left and right wing parts (5) have upper and lower walls (5A, 5B) and front and rear walls (5C, 5D), and extend from the middle part (4) to the wing part. (5)
As going to the outer end, the upper wall (5A) is inclined so as to gradually approach the lower wall (5B), and the upper and lower walls (5A, 5B)
You characterized in that the longitudinal width of the are progressively wider
Elastic crawler for the metal core. 4. A core metal for an elastic crawler according to claim 1, wherein said left and right wing portions (5) are formed with holes (6) communicating with the inside at the outer ends. . 5. The method according to claim 1, wherein the lower wall (5B) of the left and right wing portions (5) is formed substantially flat .
The core metal for an elastic crawler according to any one of the above. 6. according to any one of claims 1 to 5, characterized in that said intermediate portion (4) is hollow at and cross section elliptical or lower surface is formed into a flat cross section semi-circular Core for elastic crawler. 7. The elastic crawler according to claim 1, wherein the intermediate part (4) has a metal or non-metal auxiliary member (7) inserted therein. Core metal. 8. A pair of left and right protrusions (9) protruding upward are formed at the left and right ends of the intermediate part (4), and the protrusions (9) are formed hollow inside. The core metal for an elastic crawler according to any one of claims 1 to 7 , characterized in that: 9. The elastic crawler according to claim 1, wherein the middle part (4) and the left and right wing parts (5) are formed as separate members and welded to each other. Core metal. 10. The elastic crawler core according to claim 9, wherein the middle part (4) is hollow inside and is formed with a rib (8) dividing the inside into a plurality of front and rear parts. 11. the elastic crawler according to claim 9 or 10, characterized in that said intermediate portion (4) pair of right and left projecting portions in the right and left end portions projecting above the (9) is integrally formed Core metal. 12. A metal cylinder material is cut into a required size to form a cylinder material (12), and left and right sides of the cylinder material (12) are outer ends while leaving a middle portion (4) of a required size. A method for producing a core metal for an elastic crawler, characterized in that a wing (5) is formed by press working so as to become thinner toward the side. 13. The manufacturing of a core metal for an elastic crawler according to claim 12, wherein a core material (7) is inserted into the intermediate portion (4) before the left and right side portions are pressed. Method. 14. A projection material (13) is formed by folding a thin metal plate into two parts, and this projection material (13) is welded to the left and right ends of the middle part (4) to form a projection part (9). The method for manufacturing a core metal for an elastic crawler according to claim 12 or 13 , wherein 15. An intermediate member (14) is formed from a metal material, and a metal tubular member is pressed so as to become thinner from one end to the other end to form a wing member (15). ), The thick-walled ends of the pair of left and right wing members (15) are welded to both ends of the core metal for an elastic crawler. 16. The intermediate member (14) made of a metal material,
The elastic crawler core according to claim 15, wherein the core is formed of any one of a pipe material, a drawn material having a rib (8) therein, a bent material obtained by bending a flat plate, a forging or a casting. Gold manufacturing method. 17. The core metal (1) according to any one of claims 1 to 11, embedded in a crawler body (2) made of an elastic material at a circumferential interval, and an outer periphery of the core metal (1). A pair of left and right circumferential tension members (1
8) is buried, an engagement hole (16) is formed between the left and right tension members (18) and between the metal cores (1) to engage the drive wheel (3), and the outer periphery of the crawler body (2) is formed. Surface engagement hole (16)
An elastic crawler, characterized in that a lug (17) is integrally formed therebetween.