JP2001114144A - Elastic crawler and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elastic crawler which can decrease the winding time for a tensile strength cord and lessen disturbance of a row of the tensile strength cords. SOLUTION: In this elastic crawler formed by burying a tensile strength body 13 in the circumferential direction A of a crawler in a crawler body 7 formed endless by a rubber-like elastic body, the tensile strength body 13 is so constructed that adjacent portions in the crawler cross direction B of the tensile strength cord 13 are arranged in parallel in the crawler cross direction B by spirally winding a unit tensile strength cord body 15 taking plural tensile strength cords 13 as one unit in the crawler circumferential direction A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic crawler employed in a crawler type traveling device used as a traveling section of a construction / civil work machine, an agricultural work machine, and the like, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as a traveling device, a driving sprocket disposed in one of the front and rear directions of travel, an idler disposed in the other, a plurality of rolling wheels disposed between the driving sprocket and the idler, A crawler type comprising a drive sprocket, an idler, and an endless belt-shaped rubber crawler wound around the rolling wheel, and the drive sprocket is rotated to make the rubber crawler circulate in the circumferential direction. There is a traveling device.

The rubber crawler has an endless belt-shaped crawler body made of rubber and a core metal in a crawler width direction.
It is mainly embedded at intervals in the crawler circumferential direction and is buried over the entire crawler circumferential direction. In addition, since a very large tension acts on the rubber crawler in the crawler circumferential direction, a crawler circumferential direction tension member surrounding the core metal is provided in the crawler body. Japanese Patent Application Laid-Open No. 7-6 / 1995 discloses a structure in which one end-end tensile cord is wound around the crawler in the circumferential direction once and arranged in parallel in the crawler width direction.
No. 0869 and Japanese Patent No. 2863588.

[0004] In this case, since one end of the tensile cord is formed into an annular shape by overlapping (lap joint) the two end portions thereof in the crawler body, the end of the tensile cord is formed. When the rubber crawler is wound around a driving sprocket or the like and is curved and tension in the crawler circumferential direction acts on the tensile member, the end side of the tensile strength cord is separated. The portion of the crawler body jumps up on the outer peripheral side of the crawler body, causing cracks in the rubber. The stiffness of the superposed portion of the tensile strength cord is large, and there are problems such as generation of vibration, noise, and poor riding comfort. Means the most leg portion of the tensile strength cord, and the end portion means a portion at a certain distance from the tip).

As a tensile member capable of solving such a problem, a single tensile cord is spirally wound (a single tensile cord is wound several times in the crawler circumferential direction while shifting its position in the crawler width direction). The spiral (jointless) structure having a seamless structure is disclosed in Japanese Unexamined Patent Publication No. 9-76369 and 57-174287.
No. 6,086,045. In order to form a rubber crawler provided with this spiral-structured tensile member, FIGS.
As shown in (e), first, the left and right split molds 31a are fitted together to form an inner mold 31, and the inner mold 31 is filled with an unvulcanized rubber material 32 constituting an inner peripheral side of a rubber crawler. At the same time, one tensile cord 33 is spirally wound around the outer peripheral side of the unvulcanized rubber material 32 filled in the inner cavity 31.

Next, an outer mold 35 filled with an unvulcanized rubber material 34 constituting the outer peripheral side of the rubber crawler is united with the inner mold 31 and then the rubber material is vulcanized. Take out.

[0007]

The conventional rubber track provided with the tension member having a spiral structure has a problem that it takes time to wind up the tensile strength cord on the unvulcanized rubber material. Further, since there is a gap between tensile strength cords adjacent in the crawler width direction before vulcanization, there is also a problem that the tensile strength cord is easily disturbed during vulcanization. If the end portion of the tensile cord is close to (or in contact with) a tensile cord adjacent in the crawler width direction, the adhesiveness between the end portion of the tensile cord and the rubber is poor. The load acting on the crawler, such as a compressive load, a tensile load, and a torsional load, makes it easier for the end portion of the tensile cord to separate from the rubber, and the rubber crawler is driven when the end portion of the tensile cord separates from the rubber. When wrapped around a sprocket or the like and bent, the end portion of the tensile cord tends to jump to the outer peripheral side of the crawler, causing a rubber crack and exposing the end portion of the tensile cord. is there.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides an elastic crawler capable of reducing the time required for winding a tensile strength cord and reducing the disturbance of a row of tensile strength cords, and a method of manufacturing the same. Aim.

[0009]

The technical means taken by the present invention to achieve the above object is to provide a crawler body 7 formed of a rubber-like elastic body in an endless shape and having a tensile strength in a crawler circumferential direction A. In the elastic crawler in which the body 13 is embedded, the tensile body 13 is formed such that a unit tensile cord body 15 having a plurality of tensile cords 14 as one unit has a spiral shape.
By being wound in the circumferential direction A of the crawler, the tensile cord 1
No. 4 is characterized in that the portions adjacent to each other in the crawler width direction B are arranged side by side in the crawler width direction B.

Further, each end 14a of the tensile strength cord 14
Are preferably formed so as to be arranged diagonally to the crawler width direction B. In addition, the unit tensile cord body 15
It is preferable that at least one end side portion 15b is formed in a curved shape. Further, it is preferable that one end 15a and the other end 15a of the unit tensile cord body 15 are located at a predetermined interval in the crawler circumferential direction A. Also,
Assuming that the dimension between adjacent portions of the unit tensile cord body 15 in the crawler width direction B is a, and the dimension between adjacent portions of the tensile cord 14 constituting the unit tensile cord body 15 in the crawler width direction B is b, It is preferable that a> b.

Further, another technical means is that a tensile member 23 in a crawler circumferential direction A is embedded in a crawler body 7 formed endlessly by a rubber-like elastic body. By winding one or more tensile cords 14 in the crawler circumferential direction A so as to form a spiral, portions of the tensile cords 14 adjacent to the crawler width direction B become parallel to the crawler width direction B. And the tensile strength cord 14
Is formed so as to shift outward B1 in the crawler width direction toward the tip end 14a.

Another technical means is to provide a tensile cord 1 on the outer peripheral side of the unvulcanized rubber constituting the inner peripheral side of the elastic crawler.
4 is spirally wound in the crawler circumferential direction A, and then the unvulcanized rubber constituting the outer peripheral side of the elastic crawler is placed on the outer peripheral side of the unvulcanized rubber constituting the inner peripheral side of the elastic crawler. A method for manufacturing an elastic crawler, which is formed by combining and vulcanizing the coated material, comprising a plurality of tensile cords 14 covered with a covering material 16 made of a rubber-like elastic body so as to be parallel. 17 and the coated cord 1
7 is wound around the outer peripheral side of the unvulcanized rubber constituting the inner peripheral side of the elastic crawler.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 2, reference numeral 1 denotes an example of a crawler-type traveling device that employs the present invention. The crawler-type traveling device 1 includes a driving sprocket 2 (drive wheel) disposed at one of front and rear sides in a traveling direction, and the other. Idler 3 (follower wheel) disposed on the drive sprocket 2
A plurality of rolling wheels 4 disposed between the driving wheel 1 and the idler 3, and an endless belt-shaped elastic crawler 5 wound around the driving sprocket 2, the idler 3 and the rolling wheels 4. A pair of right and left traveling bodies 6 are provided which are configured to rotate and drive the sprocket 2 to circulate the elastic crawler 5 in the crawler circumferential direction A.

It should be noted that the crawler traveling device 1 is not limited to the above-described forced drive type, and the idle wheels (slave wheels) disposed between the rear wheels (drive wheels) of the light truck and the front and rear wheels. A tire-driven (friction-driven) crawler traveling device in which the elastic crawler 5 is stretched over the driving wheel) may be used.
As shown in FIGS. 1 to 3, the elastic crawler 5 includes an endless crawler body 7 made of a flexible elastic body (rubber-like elastic body) such as rubber or resin. Has a large number of cores 8 in the crawler width direction B embedded all around the crawler circumferential direction A and at intervals in the crawler circumferential direction A (note that a coreless metal elastic crawler is used). May be).

On the outer peripheral surface side F (ground contact surface side) of the crawler main body 7, lugs 9 are integrally provided over the entire periphery at intervals in the crawler circumferential direction A (instead of lugs). May be formed with a block pattern or the like. The lug 8 is formed, for example, as shown in FIG. 3, at a position corresponding to the core bar 8 or over the core bar 8 adjacent in the crawler circumferential direction A. At the center of the crawler body 7 in the crawler width direction B, an engaging hole 10 located between the core bars 8 adjacent to each other in the crawler circumferential direction A and formed through the crawler thickness direction C is formed around the entire crawler circumferential direction A. Are formed. The projection of the drive sprocket 2 is inserted into the engagement hole 7 and the drive force is transmitted from the drive sprocket 2 to the elastic crawler 5.

At the center of the cored bar 8 in the crawler width direction B,
A pair of guide projections 11 are provided to protrude from the cored bar 8 toward the inner circumferential side I of the crawler.
As a result, the wheels 4 and the like are prevented from falling off. On both left and right sides of the crawler main body 7, tension members 13 which are arranged at positions on the crawler outer peripheral side F with respect to the cored bar 8 and surround the cored bar 8 are provided over the entire crawler circumferential direction A. Buried. It should be noted that any elastic crawler that is not of the type driven by the driving sprocket 2 like the elastic crawler 5 of the present embodiment, that is, an elastic crawler of a type that is frictionally driven by wheels having pneumatic tires mounted on the rim. The tensile member is provided from one end to the other end in the crawler width direction.

As shown in FIG. 1 and FIG. 4, the tensile member 13 includes a plurality of end tensile cords 14 (FIG. 1 or FIG. 4).
Are wound in the crawler circumferential direction A so as to form a helical shape (three wires in the crawler width direction). By winding several turns in the crawler circumferential direction A while shifting the position to B), the portions of the tensile strength cords 14 adjacent to the crawler width direction B are arranged in parallel in the crawler width direction B. As described above, by making the tensile cords 14 wound spirally into several units,
At the time of molding, the winding time of the spiral can be reduced to half or less, which is advantageous in terms of cost and efficiency, and can reduce disturbance during winding of the tensile strength cord. Further, by using several tensile cords 14 as a unit, the tension of the tensile cords 14 in the crawler circumferential direction A can be dispersed.

As the tensile cord 14, for example, a steel cord obtained by combining several filaments made of steel and further bundled together, or a nylon cord composed of filaments such as nylon and Tetron (registered trademark) is used. , Tetron cord, other aramid fiber cord,
A cord such as a glass fiber cord is employed. Further, as shown in FIG. 5, the unit tensile cord body 15 may be composed of two tensile cords 14, or may be composed of four or more tensile cords 14.

The tip 15a of the unit tensile cord body 15
Is formed in a shape cut (bias cut) in a direction (bias direction) D intersecting the crawler width direction B, and the tip 14a of each tensile cord 14 intersects the crawler width direction B. They are arranged and formed so as to be arranged in the direction D. Thereby, the unit tensile cord body 15
Can reduce the rigidity difference between the front end 15a and the front end 15a of the crawler in the circumferential direction A, so that stress concentration at the front end 15a of the unit tensile cord body can be alleviated and peeling becomes difficult.

In FIG. 1, the unit tensile cord 15
Is disposed at a position corresponding to the cored bar 8, but may be disposed between the cored bars 8 adjacent in the crawler circumferential direction A. In this embodiment, one end 15a of the unit tensile cord 15 and the other end 15a
As shown in FIG. 1, FIG. 4 and FIG. 5, a is shifted by L in the crawler circumferential direction A,
This is, as shown in FIG.
When the one end 15a and the other end 15a are at the same position in the crawler circumferential direction A, as can be seen from the graph of FIG. 19, one end 15a and the other end 15a of the unit tensile cord body 15 are However, the rigidity of the portion G between the crawler width directions B becomes locally weaker than other portions (J, H, etc.) (as in the present invention, the number of the tensile cords 14 constituting the tensile member 13 is large. When tension is applied to the tension member 13 in the crawler circumferential direction A, one end 15a of the unit tensile cord 15 and the other end 15a
a between the crawler width direction B and the crawler width direction B
This is because cracks may occur.

FIG. 19 shows the unit tensile strength cord body 15.
The vertical axis indicates the position of the unit tensile strength cord body 15 in the crawler circumferential direction A, and the horizontal axis indicates the strength of the unit tensile strength cord body 15. Symbols G, J, and H indicate the crawler circumferential direction A of the unit tensile strength cord body 15 in FIG. Corresponding to positions G, J, and H. The intensity increases as going to the right. The distance L between the one end 15a and the other end 15a of the unit tensile cord body 15 in the crawler circumferential direction A may be at least １ ／ of the pitch between the cores 8. As shown in FIG. 6, when one end 15a and the other end 15a of the unit tensile cord body 15 are located at positions corresponding to the same core 8, the width L of the core 8 in the crawler circumferential direction A is set. It is sufficient if it is 1/2 or more.

The distance L between the one end 15a and the other end 15a of the unit tensile cord body 15 in the crawler circumferential direction A is such that the elastic crawler 5 is wound around the drive sprocket 2 or the idler 3 and is in contact therewith. It should be larger than the length of the part. Here, several tensile cords 1
The method of manufacturing the elastic crawler 5 in which the tensile member 13 having a spiral structure composed of the elastic member 4 is embedded will be described. The elastic crawler 5 is formed in the same manner as the manufacturing method described in the section of the prior art in the outline. In the present embodiment, as shown in FIGS. 6 and 7, before the unit tensile cord body 15 is wound up on the unvulcanized rubber material constituting the inner peripheral side of the elastic crawler 5, Each of the tensile cords 14 is covered with a covering member 16 made of an elastic body so as to be parallel to each other to form a covered cord body 17. The covered cord body 17 is formed on the inner peripheral side of the elastic crawler 5. Wind up the outer periphery of the vulcanized rubber material. Thereafter, similarly to the conventional manufacturing method, the outer mold filled with the unvulcanized rubber material constituting the outer peripheral side of the elastic crawler 5 is combined with the inner mold, and then the rubber material is vulcanized.

As described above, the unit tensile cord body 15
When the unit tensile strength cord body 15 is wound around an unvulcanized rubber material constituting the inner peripheral side of the elastic crawler 5 or during vulcanization, the interval between the tensile strength cords 14 in the crawler width direction B is disturbed. There is an effect that a predetermined interval can be obtained without any need. Further, as shown in FIG. 9, the tensile member 13 is formed such that a dimension between adjacent portions of the unit tensile cord body 15 in the crawler width direction B is a, and each tensile cord 14 constituting the unit tensile cord body 15 is a. In this case, if the dimension between adjacent portions in the crawler width direction B is b, it is preferable that a> b is satisfied.

If the outer surface of the elastic crawler 5 receives a cut due to the elastic crawler 5 riding on a protrusion or the like, rust is generated when the cut advances and reaches the tensile strength cord 14, but a = In b, unit tensile cord body 1
5 in the crawler width direction B of each tensile cord 14 constituting
Since the adhesive strength between the adjacent portions in (1) is larger than the adhesive strength between the adjacent portions in the crawler width direction B of the unit tensile strength cord body 15 itself, the progress of the cut (the progress of rust due to the cut). With respect to (1), the progress of each of the tensile cords 14 constituting the unit tensile cord body 15 between the adjacent portions in the crawler width direction B is slower.

Therefore, by increasing the distance between adjacent portions of the unit tensile cord body 15 in the crawler width direction B (a> b), the rubber strength therebetween is increased, and the progress of cuts (peeling) is suppressed. ing. As shown in FIG. 9, the end portion 15 b of the unit tensile cord body 15 is
It is preferable that the tension member 13 be wound around by the protector 18 so as to surround the crawler in the crawler width direction. This is because the elastic crawler 5 has the drive sprocket 2
When it is wound around the idler 3 and bent, the tension in the crawler circumferential direction A acts on the tensile member 13, and the end portion 15 b of the unit tensile cord body 15 tends to return to its original position. The end portion 15b tends to jump up to the outer circumferential side F of the crawler, but this jump can be effectively suppressed by the protector 18.

The protector 18 includes, for example, a cord arranged in a direction crossing the tensile cord 14,
Those that are arranged in parallel at a distance from each other in a direction orthogonal to the cord arrangement direction are used. By using such a protector 18, the elastic crawler 5 can be used.
Of the unit tensile strength cord body 15 can be effectively suppressed without hindering the flexibility of the unit. The protector 18 may be made of a steel cord, a nylon cord, a Tetron cord, an aramid fiber cord, a glass fiber cord, or the like.

Further, as shown in FIG. 10, the end side portion 15b of the unit tensile cord body 15 may be covered with a rubber sheet 19 and the outside thereof may be wound by a protector 18. 11 to 16 are intended to prevent the end portion 15b of the unit tensile strength cord body 15 from jumping to the outer circumferential side F of the crawler. FIG.
1 shows an end portion 15b of a unit tensile cord body 15 covered with a rubber sheet 19 and the end portion 1b.
By disposing the protector 18 on the outer circumferential side F of the crawler 5b and the rubber sheet 19, the unit tensile cord 15
Of the end portion 15b. A well-known canvas 20 is arranged in the crawler circumferential direction A on the crawler inner circumferential side I of the end portion 15b and the rubber sheet 19 and on the crawler outer circumferential side F of the cored bar 8.

FIGS. 12 and 13 show an end portion 15b of the unit tensile cord 15 when the end portion 15b of the unit tensile cord 15 is moved toward the inner peripheral side I of the crawler by a rubber sheet 19. In FIG. 12, a protector 18 is further arranged on the crawler outer peripheral side F of the rubber sheet 19, and in FIG.
0 is buried. 14, 15, and 16, the curved portion (loose portion) 21 is formed in the end portion 15 b of the unit tensile cord 15, and the tension in the crawler circumferential direction A acts on the unit tensile cord 15. In this case, the bending portion 21 reduces the tension acting on the end portion 15b of the unit tensile cord body 15, thereby preventing the end tensile portion 15b of the unit tensile cord body 15 from jumping up. It is.

In FIG. 14, the end-side portion 15b of the unit tensile cord body 15 is further sunk into the crawler inner peripheral side I of the other part of the unit tensile cord body 15, so that the unit tensile cord body 15 end side part 15
b is sandwiched between the other portion of the unit tensile cord body 15 and the core bar 8 so as to press down the end portion 15b of the unit tensile cord body 15. FIG.
Reference numeral 18 denotes a protector, and reference numeral 20 denotes a canvas. In FIGS. 15 and 16, the curved portion 21 is formed by the rubber mass 22 disposed on the crawler outer peripheral side F or the crawler inner peripheral side I of the end portion 15b of the unit tensile cord body 15, and the protector is formed. The end portion 15b of the unit tensile cord body 15 is held down by 18.

FIG. 17 shows a structure in which the end portion 14b of the tensile strength cord 14 constituting the tensile member 23 is shifted outward in the crawler width direction B1 toward the tip end 14a. . When the end portion 14b of the tensile cord 14 is close to (or in contact with) the tensile cord 14 adjacent in the crawler width direction B, the adhesiveness between the end portion 14b of the tensile cord 14 and the rubber is poor. Therefore, due to a load acting on the elastic crawler 5, such as a compressive load, a tensile load, and a torsional load, the end portion 14b of the tensile cord 14 is easily peeled off from the rubber, and the end portion 14b of the tensile cord 14 is removed. When peeled from the rubber, when the elastic crawler 5 is wound around the drive sprocket 2 or the like and bent, the end side portion 14b of the tensile strength cord 14 tends to jump on the crawler outer peripheral side F, and a rubber crack occurs. The end portion 14b of the tensile cord 14 may be exposed, but the end portion 14b of the tensile cord 14 may be exposed.
Is formed so as to move outward in the crawler width direction B1 toward the tip end 14a, and the end side portion 14b of the tensile strength cord 14 and the portion of the tensile strength cord 14 adjacent thereto in the crawler width direction B are formed. By taking a sufficient distance between the end portions 14b of the tensile strength cord 14,
And rubber can be improved in adhesion, and peeling can be prevented.

In this case, the tensile body 23 is formed by winding one (or a plurality of) tensile strength cords 14 in the crawler circumferential direction A so as to form a helical shape. The portion adjacent to B is configured to be parallel in the crawler width direction B, and other configurations are substantially the same as those in the above-described embodiment. The elastic crawler 5 described above can be manufactured by other known manufacturing methods in addition to the conventional manufacturing method shown in FIG. 21. For example, the elastic crawler 5 is partially manufactured in the crawler circumferential direction A and There are ways to go.

In this manufacturing method, for example, first, as shown in FIG. 20, an outer mold 40 forming a part of the outer peripheral side of the elastic crawler 5 and an inner mold of the elastic crawler 5 corresponding to the outer mold 40 are formed. Tensile body 1 with inner mold 41 forming side
The elastic crawler 5 is partially formed in two places (5A, 5B) by the two sets of the inner and outer dies 41, 40. Next, as shown in FIG. 21, a portion 5A, 5A, of the elastic crawler 5 formed by the two sets of inner and outer dies 41, 40 is used.
The tension member 13 is sandwiched between two sets of inner and outer molds 43 and 42 disposed between the inner and outer molds 5B, and the portions 5A and 5B of the elastic crawler 5 are connected by the two sets of inner and outer molds 43 and 42. The portions 5C and 5D between the portions 5A and 5B of the elastic crawler 5 are formed.

This manufacturing method can be changed in various ways. For example, in the above-described example, the elastic crawler 5 is divided into four, but may be divided into two or three or more. Further, they may be formed one by one.

[0034]

According to the present invention, an elastic crawler in which a tensile member 13 in a crawler circumferential direction A is embedded in a crawler body 7 formed endlessly of a rubber-like elastic material is used. A plurality of unit tensile cord bodies 15 having one unit as a unit are wound in a crawler circumferential direction A so as to form a spiral, so that a portion of the tensile cord 14 adjacent to the crawler width direction B becomes a crawler width direction B. By forming the tensile members 13 so as to be parallel to each other, the winding time of the tensile cord 14 can be reduced to half or less at the time of molding, which is advantageous in terms of cost and efficiency. It is possible to reduce the disturbance at the time of 14 winding. Further, by using several tensile cords 14 as a unit, the tension of the tensile cords 14 in the crawler circumferential direction A can be dispersed.

Each end 13a of the tensile cord 14
Are formed obliquely to the crawler width direction B, so that the distal end 15 of the unit tensile cord body 15 is formed.
a), the difference in rigidity between the front and rear of the crawler circumferential direction A can be reduced, the stress concentration at the tip end 15a of the unit tensile cord body can be reduced, and the unit tensile cord body 15 is hardly peeled off, and at least one end side of the unit tensile cord body 15 By forming the portion 15b in a curved shape, when the tension 3 in the crawler circumferential direction A acts on the tensile strength 3, the unit tensile cord 15
The tension acting on the end side portion 15b can be reduced.

Further, by positioning one end 15a and the other end 15a of the unit tensile cord body 15 at a predetermined interval in the crawler circumferential direction A, one end 15a of the unit tensile cord body 15 and the other end 15a are located. Tip 15
a between the crawler width direction B and the crawler width direction B can be prevented from being generated, and when tension in the crawler circumferential direction A acts on the tensile body 13, the unit tensile cord body 15 Cracks can be prevented from occurring in a portion between the one end 15a and the other end 15a in the crawler width direction B.

If the outer surface of the elastic crawler 5 is cut by the elastic crawler 5 riding on a projection or the like, the cut flaws are advanced and the tensile strength cord 14
Rust occurs, but the adhesive strength between adjacent portions in the crawler width direction B of each tensile cord 14 constituting the unit tensile cord body 15 is the unit tensile cord body 1
Since the adhesive strength between the adjacent parts in the crawler width direction B is larger than the adhesive strength between the adjacent parts in the crawler width direction B, the progress of the cut flaws (the progress of rust due to the cut flaws) is not affected by each tensile strength cord constituting the unit tensile strength cord body 15. 14 progresses more slowly between portions adjacent to each other in the crawler width direction B. Therefore, the dimension between adjacent portions of the unit tensile cord body 15 in the crawler width direction B is defined as a, and the dimension between adjacent portions of the tensile cord 14 constituting the unit tensile cord body 15 in the crawler width direction B is defined as b. Then, a> b
By doing so, the rubber strength between adjacent portions in the crawler width direction B of the unit tensile cord body 15 itself can be increased, and the progress of cut flaws (peeling) can be suppressed.

Further, a tensile member 23 in the crawler circumferential direction A is embedded in the crawler body 7 which is formed endlessly by a rubber-like elastic material, and the tensile member 23 includes one or a plurality of tensile cords. 14 in the crawler circumferential direction A so as to form a spiral.
, The adjacent portions of the tensile cord 14 in the crawler width direction B are arranged in parallel in the crawler width direction B, and the end portion 14b of the tensile cord 14
Is formed so as to move outward in the crawler width direction B1 toward the tip end 14a, and the end side portion 14b of the tensile strength cord 14 and the portion of the tensile strength cord 14 adjacent thereto in the crawler width direction B are formed. By taking a sufficient distance between the end portions 14b of the tensile strength cord 14,
And rubber can be improved in adhesion, and peeling can be prevented.

Further, a tensile strength cord 14 is wound around the outer peripheral side of the unvulcanized rubber constituting the inner peripheral side of the elastic crawler in a spiral direction in the crawler peripheral direction A, and thereafter the outer peripheral side of the elastic crawler is formed. The unvulcanized rubber to be bonded to the outer peripheral side of the unvulcanized rubber constituting the inner peripheral side of the elastic crawler, and vulcanizing and forming the same. Covered with a covering material 16 made of a rubber-like elastic body so that
7 and the coated cord body 17 is wound around the outer peripheral side of the unvulcanized rubber constituting the inner peripheral side of the elastic crawler, so that the unit tensile cord body 15 is formed on the inner peripheral side of the elastic crawler 5. When winding up or vulcanizing the unvulcanized rubber material constituting the above, the intervals between the tensile strength cords 14 in the crawler width direction B can be set to a predetermined interval.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an elastic crawler viewed from a thickness direction.

FIG. 2 is a side view of the traveling body.

FIG. 3 is a cross-sectional view of the elastic crawler cut along a plane orthogonal to a circumferential direction.

FIG. 4 is a perspective view of a tensile body.

FIG. 5 is a plan view of the tensile body.

FIG. 6 is a view of a part of the tensile member as viewed from a crawler thickness direction.

FIG. 7 is a perspective view of a covered cord body.

FIG. 8 is a perspective view of a covered cord body.

FIG. 9 is a cross-sectional view of the tension member and the like cut along a plane perpendicular to the crawler circumferential direction.

FIG. 10 is a cross-sectional view of a tensile member or the like cut along a plane perpendicular to the crawler circumferential direction.

FIG. 11 is a cross-sectional view of the elastic crawler cut along a plane orthogonal to the width direction.

FIG. 12 is a cross-sectional view of the elastic crawler cut along a plane orthogonal to the width direction.

FIG. 13 is a cross-sectional view of the elastic crawler cut along a plane orthogonal to the width direction.

FIG. 14 is a cross-sectional view of the elastic crawler cut along a plane orthogonal to the width direction.

FIG. 15 is a cross-sectional view of the elastic crawler cut along a plane orthogonal to the width direction.

FIG. 16 is a cross-sectional view of the elastic crawler cut along a plane orthogonal to the width direction.

FIG. 17 is a view showing an end portion of the tensile strength cord as viewed from a crawler thickness direction.

FIG. 18 is a plan view of the unit tensile body showing a case where one end and the other end of the unit tensile cord body are at the same position in the crawler circumferential direction.

FIG. 19 is a graph showing strength when one end and the other end of the unit tensile cord body are at the same position in the crawler circumferential direction.

FIG. 20 is a sectional view illustrating an example of a method for manufacturing an elastic crawler.

FIG. 21 is a cross-sectional view illustrating an example of a method for manufacturing an elastic crawler.

FIG. 22 is a cross-sectional view illustrating an example of a manufacturing process of an elastic crawler provided with a tension member having a spiral structure.

[Explanation of symbols]

7 Crawler body 13 Tensile body 14 Tensile cord 14a Tip 14b End side part 15 Unit tensile cord body 15b End side part 16 Coating material 17 Coated cord body 23 Tensile body A Crawler circumferential direction B Crawler width direction a Unit tensile cord Dimensions between adjacent portions in the crawler width direction of the body itself b Unit dimensions between adjacent portions in the crawler width direction of the tensile cord constituting the tensile strength cord body

Claims (7)

[Claims] 1. An elastic crawler in which a tensile body (13) in a crawler circumferential direction (A) is embedded in a crawler body (7) formed endlessly of a rubber-like elastic body. (13) The tensile strength cord (15) is wound in the crawler circumferential direction (A) so that the unit tensile strength cord body (15) having a plurality of tensile strength cords (14) as one unit is spirally wound. The elastic crawler according to (14), wherein portions adjacent to each other in the crawler width direction (B) are arranged side by side in the crawler width direction (B). 2. Each end (14) of a tensile cord (14).
The elastic crawler according to claim 1, wherein a) is formed so as to be arranged obliquely to the crawler width direction (B). 3. The elastic crawler according to claim 1, wherein at least one end side portion (15b) of the unit tensile cord body (15) is formed in a curved shape. 4. The unit tensile cord body (15), wherein one end (15a) and the other end (15a) of the unit tensile cord (15) are located at a predetermined interval in the crawler circumferential direction (A). Item 4. The elastic crawler according to any one of Items 1 to 3. 5. A crawler width direction of a tensile cord (14) constituting a unit tensile cord body (15), wherein a is a dimension between adjacent portions in the crawler width direction (B) of the unit tensile cord body (15) itself. The elastic crawler according to any one of claims 1 to 4, wherein a> b, where b is a dimension between adjacent portions in (B). 6. A tensile body (23) in a crawler circumferential direction (A) is buried in a crawler body (7) formed endlessly by a rubber-like elastic body. By winding one or a plurality of tensile cords (14) in the crawler circumferential direction (A) so as to form a spiral, a portion adjacent to the tensile cord (14) in the crawler width direction (B) is formed. It is configured to be parallel in the crawler width direction (B),
An elastic crawler characterized in that an end side portion (14b) of the tensile cord (14) is formed so as to move outward (B1) in the crawler width direction toward the tip (14a). 7. A tension cord (14) is wound around the outer peripheral side of the unvulcanized rubber constituting the inner peripheral side of the elastic crawler in a spiral direction in the crawler peripheral direction (A). A method of manufacturing an elastic crawler, which comprises combining an unvulcanized rubber constituting an outer peripheral side with an outer peripheral side of an unvulcanized rubber constituting an inner peripheral side of an elastic crawler, and vulcanizing and molding the same. A cord (17) is formed by covering the tensile cord (14) with a covering material (16) made of a rubber-like elastic body so as to be parallel to the cord (17).
Is wound around the outer peripheral side of the unvulcanized rubber constituting the inner peripheral side of the elastic crawler.