JP2021003911A - Elastic crawler - Google Patents

Abstract

To provide an elastic crawler characterized in that cracks hardly occur.SOLUTION: An elastic crawler 2 includes a principal part 4, plural left lugs 6, plural right lugs 8, plural first core metals 10a, and plural second core metals 10b. The principal part 4 is shaped like an endless belt. Each of the lugs 6 projects from the periphery 16 of the principal part 4. The lug 6 has a grounded surface. Each of the core metals 10 is embedded in the principal part 4. The first core metal 10a has a long blade 42a and a short blade 44a. The outer edge of the long blade 42a is located outside in a width direction beyond the outer edge of the grounded surface.SELECTED DRAWING: Figure 1

Description

The present invention relates to an elastic crawler of a traveling device. In particular, the present invention relates to crawlers with cores and lugs.

Some construction equipment has elastic crawlers. This elastic crawler runs on uneven ground. Therefore, the elastic crawler rides on a curb, a large stone, or the like. The weight of construction equipment is applied to this elastic crawler. Due to this vehicle weight, a large tension is applied to the elastic crawler.

Elastic crawlers can slip off the curb. As described above, since tension is applied to this elastic crawler, the elastic crawler may crack due to slipping off. Cracks are likely to occur near the outer edge of the elastic crawler. This crack is called a "cut ear".

Japanese Unexamined Patent Publication No. 2010-247562 discloses an elastic crawler whose outer edge thickness varies. This elastic crawler does not easily slip off the curb. Therefore, this elastic crawler is less likely to crack.

JP-A-2010-247562

Even with the elastic crawler disclosed in JP-A-2010-247562, slip-off from the curb is not sufficiently suppressed. Therefore, even with this elastic crawler, cracks can occur frequently.

An object of the present invention is to provide an elastic crawler that is less likely to crack.

The elastic crawler according to the present invention
The main part, which is made of elastic material and has an endless belt shape,
A plurality of lugs protruding from the outer peripheral surface of the main part and having a ground contact surface,
A plurality of first cores and a plurality of second cores embedded in the main part,
Have. Each first core metal has a central portion, a long blade extending from the central portion in the negative width direction, and a short blade extending from the central portion in the positive width direction. Each second core has a central portion, a short wing extending from the central portion in the negative width direction, and a long wing extending from the central portion in the positive width direction. The position of the outer end in the width direction of the long wing is outside the position of the outer end in the width direction of the ground plane.

Preferably, the first core metal and the second core metal are arranged alternately along the circumferential direction.

Preferably, the distance between the position of the outer end in the width direction of the long blade and the outer edge of the main portion is 30 mm or less.

Preferably, the position of the outer end of the short wing in the width direction is inside the position of the outer end of the ground plane in the width direction.

Preferably, the difference between the length of the long wing and the length of the short wing is 10 mm or more. Preferably, the difference between the length of the long wing and the length of the short wing is 40 mm or less.

Preferably, when the elastic crawler is viewed from the thickness direction, the vicinity of the outer end of the long wing overlaps one lug.

Preferably, when the elastic crawler is viewed from the thickness direction, the total number of the first core metal and the second core metal on which the lugs overlap is 3 or more. Preferably, the lug overlaps one first core and two second cores.

The elastic crawlers may have a pair of anti-book bodies, each substantially extending in the circumferential direction. One anti-book body is located directly below the long wing of the first core metal and the short wing of the second core metal, and the other anti-book body is of the short wing of the first core metal and the long wing of the second core metal. Located directly below. Preferably, the thickness of the short wing is smaller than the thickness of the long wing.

Each lug may have a front slope located anterior to the ground plane in the direction of rotation. Preferably, in the zone outward in the width direction from the position of the outer end in the width direction of the short wing, the front slope is a substantially flat surface. Preferably, in the zone outside the width direction of the outer end of the short wing in the width direction, the angle of the front slope with respect to the width direction is 40 ° or more and 60 ° or less.

The elastic crawler according to the present invention is difficult to ride on a curb or the like. Therefore, the frequency of the elastic crawler sliding off the curb or the like is low. Moreover, in this elastic crawler, stress is dispersed. With this elastic crawler, cracks are suppressed.

FIG. 1 is a bottom view showing a part of an elastic crawler according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the crawler of FIG. FIG. 3 is another cross-sectional view showing the crawler of FIG. 4 (a) is a bottom view showing the left lug of the crawler of FIG. 1, FIG. 4 (b) is a cross-sectional view taken along the line BB of FIG. 4 (a), and FIG. 4 (c). ) Is a cross-sectional view taken along the line CC of FIG. 4 (a). FIG. 5 is an explanatory view showing the first core metal and the second core metal of the crawler of FIG. FIG. 6 is a bottom view showing the crawler lug of FIG. 1 together with the core metal. 7 (a) is a cross-sectional view showing the first core metal of the crawler of FIG. 1 together with the anti-book body, and FIG. 7 (b) shows the second core metal of the crawler of FIG. 1 together with the anti-book body. It is a cross-sectional view. FIG. 8 is a bottom view showing a part of the elastic crawler according to another embodiment of the present invention.

Hereinafter, the present invention will be described in detail based on preferred embodiments with reference to the drawings as appropriate.

FIG. 1 is a bottom view of the elastic crawler 2, FIG. 2 is a cross-sectional view thereof, and FIG. 3 is another cross-sectional view. In FIG. 1-3, the arrow X is the width direction, the arrow Y is the circumferential direction, and the arrow Z is the thickness direction. The right side in FIG. 1 is in the positive width direction. The lower side in FIG. 1 is the traveling direction of the elastic crawler 2.

The elastic crawler 2 shown in FIG. 1-3 includes a main portion 4, a plurality of left lugs 6, a plurality of right lugs 8, a plurality of first core metal 10a, a plurality of second core metal 10b, and a pair of anti-book bodies. Has twelve. The elastic crawler 2 is attached to a traveling device such as construction equipment, agricultural equipment and civil engineering equipment. A typical traveling device has drive wheels, rolling wheels and sprockets. The elastic crawler 2 is wound between the drive wheel and the rolling wheel.

The main portion 4 has an endless belt shape. The main portion 4 has an inner peripheral surface 14 and an outer peripheral surface 16. The main portion 4 further has a pair of outer edges 18. What is indicated by the arrow W in FIG. 1 is the width of the main portion 4. The width W is the distance from one outer edge 18 to the other outer edge 18. The width W of the main portion 4 is also the width of the crawler 2. The width W of the general elastic crawler 2 is 100 mm or more and 500 mm or less. The main portion 4 has a plurality of engaging holes 20. When the crawler 2 is attached to the traveling device, the claw of the sprocket enters the engaging hole 20.

The main portion 4 is formed of an elastic material. Rubber, synthetic resin, elastomer and the like can be used for the main part 4. Typically, the main portion 4 is formed by cross-linking the rubber composition.

As shown in FIGS. 2 and 3, each left lug 6 is located to the left of the widthwise center of the crawler 2. The left lug 6 projects from the outer peripheral surface 16 of the main portion 4. As shown in FIG. 1, a large number of left lugs 6 are arranged along the circumferential direction. In this embodiment, these left lugs 6 are arranged at equal pitches. The left lug 6 is integrally molded with the main portion 4. The material of the left lug 6 is the same as that of the main part 4.

4 (a) is a bottom view showing the left lug 6 of the crawler 2 of FIG. 1, FIG. 4 (b) is a cross-sectional view taken along the line BB of FIG. 4 (a), and FIG. (C) is a cross-sectional view taken along the line CC of FIG. 4 (a). The left lug 6 has a ground contact surface 22, an outer slope 24, an inner slope 26, a front slope 28, and a rear slope 30.

The ground plane 22 is flat. The ground contact surface 22 is a surface that comes into contact with the ground when the crawler 2 travels on a flat ground. The ground plane 22 includes an outer edge 32, an inner edge 34, a front edge 36, and a rear edge 38. The ground plane 22 is generally inclined toward the rear side in the traveling direction and toward the outside in the width direction. The ground plane 22 may extend in the width direction. The crawler 2 may have a non-flat ground plane.

The outer slope 24 is located outside the outer edge 32 in the width direction. The outer slope 24 connects the ground contact surface 22 and the outer edge 18 (see FIG. 1) of the main portion 4. The inner slope 26 is located inside the inner edge 34 in the width direction. The inner slope 26 connects the ground contact surface 22 and the outer peripheral surface 16 (see FIG. 2) of the main portion 4. The front slope 28 is located on the front side in the traveling direction with respect to the front edge 36. The front slope 28 connects the ground contact surface 22 and the outer peripheral surface 16 (see FIG. 2) of the main portion 4. The rear slope 30 is located on the rear side in the traveling direction with respect to the rear edge 38. After this, the slope 30 connects the ground contact surface 22 and the outer peripheral surface 16 (see FIG. 2) of the main portion 4.

As shown in FIGS. 2 and 3, each right lug 8 is located to the right of the center of the crawler 2 in the width direction. The right lug 8 projects from the outer peripheral surface 16 of the main portion 4. As shown in FIG. 1, a large number of right lugs 8 are arranged along the circumferential direction. In this embodiment, these right lugs 8 are arranged at equal pitches. The right lug 8 is integrally molded with the main portion 4. The material of the right lug 8 is the same as that of the main part 4.

The right lug 8 has a shape in which the shape of the left lug 6 shown in FIG. 4 is reversed left and right. Therefore, the right lug 8 has a ground contact surface 22, an outer slope 24, an inner slope 26, a front slope 28, and a rear slope 30 like the left lug 6. The contact patch 22 of the right lug 8 includes an outer edge 32, an inner edge 34, a front edge 36, and a rear edge 38, similar to the contact patch 22 of the left lug 6.

As is clear from FIG. 1, in the present embodiment, the plurality of left lugs 6 and the plurality of right lugs 8 are arranged in a zigzag pattern.

FIG. 2 shows the first core metal 10a. The first core metal 10a has a central portion 40a (40), a long blade 42a (42), and a short blade 44a (44). The long wing 42a extends from the central portion 40a in the negative width direction. The short wing 44a extends from the central portion 40a in the positive width direction. The length of the long wing 42a is larger than the length of the short wing 44a. The central portion 40a, the long wing 42a, and the short wing 44a are integrally formed. The first core metal 10a is made of a hard material. A typical material of the first core metal 10a is a metal such as steel or stainless steel.

As is clear from FIG. 2, the first core metal 10a is embedded in the main portion 4. A part of the first core metal 10a may be exposed from the main portion 4. In the present invention, it is referred to as "buried", including the case where a part of the core metal 10 is exposed from the main portion 4.

FIG. 3 shows the second core metal 10b. The second core metal 10b has a central portion 40b (40), a short wing 44b (44), and a long wing 42b (42). The short wing 44b extends from the central portion 40b in the negative width direction. The long wing 42b extends from the central portion 40b in the positive width direction. The length of the short wing 44b is smaller than the length of the long wing 42b. The central portion 40b, the short wing 44b, and the long wing 42b are integrally formed. The material of the second core metal 10b is the same as the material of the first core metal 10a. The second core metal 10b is embedded in the main portion 4. As is clear from the comparison of FIGS. 2 and 3, the second core metal 10b has a shape in which the shape of the first core metal 10a is reversed left and right.

FIG. 5 shows a plurality of first core metal 10a and second core metal 10b. As is clear from FIG. 5, these first core metal 10a and the second core metal 10b are alternately arranged along the circumferential direction. On the left side of the central CL of the crawler 2, a long blade 42a of the first core metal 10a and a short blade 44b of the second core metal 10b exist. On the left side of the central CL of the crawler 2, a plurality of long wings 42a and a plurality of short wings 44b are alternately arranged along the circumferential direction. On the right side of the center CL of the crawler 2, there are a short wing 44a of the first core metal 10a and a long wing 42b of the second core metal 10b. On the right side of the central CL of the crawler 2, a plurality of short wings 44a and a plurality of long wings 42b are alternately arranged along the circumferential direction.

Each anti-book body 12 is formed by winding the cord 46. The extending direction of the cord 46 is substantially the circumferential direction. Since the cord 46 is spirally wound, the extending direction of the cord 46 is, strictly speaking, slightly inclined with respect to the circumferential direction. The material of the typical cord 46 is a metal such as steel or stainless steel. The cord 46 may be formed from organic fibers. Both anti-book bodies 12 are located substantially symmetrically with respect to the center line of the crawler 2.

As is clear from FIG. 2, the left anti-book body 12 is located directly under the long wing 42a of the first core metal 10a, and the right anti-book body 12 is directly under the short wing 44a of the first core metal 10a. Is located in. As is clear from FIG. 3, the left anti-book body 12 is also located directly under the short wing 44b of the second core metal 10b, and the right anti-book body 12 is the long wing 42b of the second core metal 10b. It is also located directly below.

FIG. 6 is a bottom view showing the left lug 6 of the crawler 2 of FIG. 1 together with the core metal 10. Hereinafter, the position of the left lug 6 and the like will be described with reference to FIG. This description also applies to the right lug 8.

In FIG. 6, the crawler 2 is viewed from the thickness direction. As described above, the core metal 10 is embedded in the main portion 4. Therefore, in FIG. 6, the core metal 10 cannot be visually recognized. In FIG. 6, the position of the core metal 10 in the bottom view (that is, viewed from the thickness direction) is indicated by a dotted line. In FIG. 6, reference numeral S1 represents a line segment that passes through the outer end of the long blade 42 in the width direction and extends in the circumferential direction, and reference numeral S2 represents a line segment that passes through the outer end of the ground plane 22 in the width direction and extends in the circumferential direction.

The line segment S1 is located outside the line segment S2 in the width direction. In other words, the position of the outer end in the width direction of the long wing 42 is outside the position of the outer end in the width direction (outer edge 32) of the ground contact surface 22 in the width direction. When the crawler 2 touches the curb, the deformation in the vicinity of the outer edge 18 is suppressed by the long wing 42. Therefore, the contact area between the crawler 2 and the curb is suppressed, and the crawler 2 is prevented from riding on the curb. The frequency of riding on the curb of this crawler 2 is low. Therefore, the frequency of slipping off the crawler 2 from the curb is low. Cracks are unlikely to occur in this crawler 2.

The arrow L1 in FIG. 6 represents the distance between the line segment S1 and the line segment S2. From the viewpoint of suppressing cracks, the distance L1 is preferably 0.5 mm or more, and particularly preferably 1.0 mm or more.

The arrow L2 in FIG. 6 represents the distance between the outer edge 18 of the main portion 4 and the outer end (outer edge 32) of the ground contact surface 22. From the viewpoint of suppressing cracks, the distance L2 is preferably 30 mm or less, and particularly preferably 25 mm or less. From the viewpoint of preventing the core metal 10 from being exposed, the distance L2 is preferably 10 mm or more.

As described above, the plurality of first cores 10a and the plurality of second cores 10b are alternately arranged along the circumferential direction. Therefore, the plurality of long wings 42 and the plurality of short wings 44 are alternately arranged along the circumferential direction. In other words, the positions of the outer ends of the core metal 10 are not aligned in the width direction. Therefore, the stress applied to the outer end of the core metal 10 is dispersed. This dispersion suppresses cracks.

The crawler may have a non-alternate arrangement of the plurality of first cores 10a and the plurality of second cores 10b. For example, first core metal 10a-first core metal 10a-second core metal 10b-second core metal 10b-first core metal 10a-first core metal 10a-second core metal 10b-second core metal 10b The crawler may have such an arrangement. Further, the first core metal 10a-the first core metal 10a-the second core metal 10b-the second core metal 10b-the first core metal 10a-the second core metal 10b-the first core metal 10a-the first core metal 10a- The crawler may have an arrangement such as a second core metal 10b-a second core metal 10b-a first core metal 10a-a second core metal 10b. In either case, the stress applied to the outer end of the core metal 10 is dispersed.

In FIG. 6, reference numeral S3 represents a line segment that passes through the outer end of the short blade 44 in the width direction and extends in the circumferential direction. The line segment S3 is located inside the line segment S2 in the width direction. In other words, the position of the outer end in the width direction of the short wing 44 is inside in the width direction from the position of the outer end in the width direction (outer edge 32) of the ground contact surface 22. The outer end of the short wing 44 is separated from the outer end of the long wing 42. When the crawler 2 rides on the curb, the stress is dispersed in the vicinity of the outer edge 18. This dispersion suppresses cracks.

The arrow L3 in FIG. 6 represents the distance between the line segment S2 and the line segment S3. From the viewpoint of suppressing cracks, the distance L1 is preferably 0.5 mm or more, and particularly preferably 1.0 mm or more.

In FIGS. 2 and 3, the arrow LL represents the length of the long wing 42, and the arrow LS represents the length of the short wing 44. From the viewpoint of suppressing cracks, the difference (LL-LS) between the length LL and the length LS is preferably 10 mm or more, and particularly preferably 15 mm or more. From the viewpoint of suppressing stress concentration near the outer end of the short blade 44, the difference (LL-LS) is preferably 40 mm or less, and particularly preferably 35 mm or less.

The short wing 44 having a small length LS can also contribute to the light weight and low cost of the crawler 2.

As is clear from FIG. 6, the vicinity of the outer end of the long wing 42 overlaps with one lug 6. The thickness of the crawler 2 in the place where the lug 6 is present is larger than the thickness of the crawler 2 in the place where the lug 6 is not present. Since the vicinity of the outer end of the long wing 42 overlaps with the lug 6, the exposure of the outer end from the rubber is suppressed.

As is clear from FIG. 6, the lug 6 overlaps with one first core metal 10a and also overlaps with two second core metal 10b. The total number of the first core metal 10a and the second core metal 10b on which the lugs 6 overlap is 3. In the crawler 2 having a total number of 3 or more, deformation in the thickness direction is suppressed. The frequency of riding on the curb of this crawler 2 is low. Therefore, the frequency of slipping off the crawler 2 from the curb is low. Cracks are unlikely to occur in this crawler 2.

As described above, the lug 6 overlaps with one first core metal 10a and also overlaps with two second core metal 10b. In other words, the lug 6 overlaps the two short wings 44, and also overlaps one long wing 42 sandwiched between these short wings 44. The lug 6 is not easily exposed from the rubber.

7 (a) is a cross-sectional view showing the first core metal 10a of the crawler 2 of FIG. 1 together with the anti-book body 12, and FIG. 7 (b) shows the second core metal 10b of the crawler 2 of FIG. It is sectional drawing which is shown together with the book body 12. In FIG. 7, the arrow TL represents the thickness of the long wing 42, and the arrow TS represents the thickness of the short wing 44. The thickness TS is smaller than the thickness TL. Since the length of the short wing 44 is small, the cord 46 of the anti-book body 12 is located directly below the tip of the short wing 44. Since the thickness TS is small, the distance between the tip of the short wing 44 and the cord 46 in the thickness direction is large. Therefore, the interference between the tip of the short wing 44 and the cord 46 is suppressed. In this crawler 2, damage to the cord 46 can be suppressed. From this point of view, the difference between the thickness TL and the thickness TS (TL-TS) is preferably 1.0 mm or more, and particularly preferably 2.0 mm or more. The difference (TL-TS) is preferably 7 mm or less. The thickness TL is preferably 2 mm or more and 15 mm or less.

FIG. 8 is a bottom view showing a part of the elastic crawler according to another embodiment of the present invention. FIG. 8 shows the left lug 48. This crawler also has a right lug. The right lug has a shape in which the shape of the left lug 48 is inverted. Similar to the elastic crawler 2 shown in FIG. 1-7, this crawler includes a main portion 4, a plurality of first core metal 10a (10), a plurality of second core metal 10b (10), and a pair of anti-book bodies 12. have.

The left lug 48 has a ground plane 50, an outer slope 52, an inner slope 54, a front slope 56, and a rear slope 58. The ground plane 50 is flat. The ground plane 50 includes an outer edge 60, an inner edge 62, a front edge 64, and a trailing edge 66. The ground plane 50 is generally inclined toward the rear side in the traveling direction and outward in the width direction.

The outer slope 52 is located outside the outer edge 60 in the width direction. The outer slope 52 connects the ground contact surface 50 and the outer edge of the main portion 4. The inner slope 54 is located inside the inner edge 62 in the width direction. The inner slope 54 connects the ground contact surface 50 and the outer peripheral surface of the main portion 4. The front slope 56 is located on the front side in the traveling direction with respect to the front edge 64. The front slope 56 connects the ground contact surface 50 and the outer peripheral surface of the main portion 4. The rear slope 58 is located on the rear side in the traveling direction with respect to the rear edge 66. After this, the slope 58 connects the ground contact surface 50 and the outer peripheral surface of the main portion 4.

FIG. 8 also shows the second core metal 10b. In FIG. 8, reference numeral S3 represents a line segment that passes through the outer end of the short blade 44 of the second core metal 10b in the width direction and extends in the circumferential direction, and reference numeral S4 represents a line segment that passes through the outer end of the lug 48 and extends in the circumferential direction. Represents. Hereinafter, the zone sandwiched between the line segment S3 and the line segment S4 is referred to as an outer zone ZO.

In the outer zone ZO, the front slope 56 is substantially flat. The front slope 56 is less likely to get caught in the curb. The frequency of the crawler having the front slope 56 riding on the curb is low. Therefore, the frequency of the crawler slipping off the curb is low. This crawler is less likely to crack.

In FIG. 8, the arrow θ represents the angle of the front slope 56 in the outer zone ZO with respect to the width direction. From the viewpoint that the crawler does not easily ride on the curb, the angle θ is preferably 40 ° or more and 60 ° or less, and particularly preferably 45 ° or more and 55 ° or less.

In the outer zone ZO, the front slope 56 may have a shape in which a plurality of planes are combined. In this case, it is preferable that the angle θ of each plane is within the above range.

The front slope 56 may have one or more curved surfaces in the outer zone ZO. In this case, it is preferable that the angle of the curved surface with respect to the width direction in the tangential direction is 40 ° or more and 60 ° or less over the entire range of the outer zone ZO.

In the outer zone ZO, the front slope 56 may have a flat surface and a curved surface. In this case, it is preferable that the angle θ of the plane is 40 ° or more and 60 ° or less, and the angle of the curved surface with respect to the width direction in the tangential direction over the entire range of the outer zone ZO is 40 ° or more and 60 ° or less.

Hereinafter, the effects of the present invention will be clarified by Examples, but the present invention should not be construed in a limited manner based on the description of these Examples.

[Example 1]
An elastic crawler having the structure shown in FIG. 1-7 was manufactured. The core metal of this crawler has a long wing and a short wing. The outer end of the long wing is located outside the outer end of the ground plane in the width direction. The outer end of the short wing is located inward in the width direction with respect to the outer end of the ground plane.

[Example 2]
An elastic crawler having the structure shown in FIG. 8 was manufactured. The core metal of this crawler has a long wing and a short wing. The outer end of the long wing is located outside the outer end of the ground plane in the width direction. The outer end of the short wing is located inward in the width direction with respect to the outer end of the ground plane. In the outer zone ZO, the front slope is flat. The angle θ of the front slope in the outer zone ZO with respect to the width direction is 50 °.

[Comparative Example 1]
A conventional elastic crawler was prepared. The core metal of this elastic crawler has a central portion, a left wing and a right wing. The right wing has a shape in which the shape of the left wing is reversed left and right. The outer end of the left wing is located inward in the width direction with respect to the outer end of the ground plane. The outer edge of the right wing is also located inside the outer edge of the ground plane in the width direction.

[Evaluation]
A traveling device equipped with each elastic crawler was run to penetrate the curb from an oblique direction. This running was repeated, and the presence or absence of cracks in the crawler was visually confirmed. Those without cracks were rated A, those with small cracks were rated B, and those with large cracks were rated C. The results are shown in the table below.

Example 1 Example 2 Comparative Example 1
Suppression of cracks BAC

From this evaluation result, the superiority of the present invention is clear.

The elastic crawler according to the present invention is suitable for various traveling devices.

2 ... Elastic crawler 4 ... Main part 6, 48 ... Left lug (lug)
8 ... Right lug 10 ... Core metal 10a ... First core metal 10b ... Second core metal 12 ... Anti-book body 16 ... Inner peripheral surface 18 ... Outer edges 22, 50・ ・ ・ Ground plane 28, 56 ・ ・ ・ Front slope 40 ・ ・ ・ Central part 42, 42a, 42b ・ ・ ・ Long wing 44, 44a, 44b ・ ・ ・ Short wing 46 ・ ・ ・ Cord

Claims (12)

The main part, which is made of elastic material and has an endless belt shape,
A plurality of lugs protruding from the outer peripheral surface of the main part and having a ground contact surface,
A plurality of first cores and a plurality of second cores embedded in the main part,
Have and
Each first core metal has a central portion, a long wing extending from the central portion in the negative width direction, and a short wing extending from the central portion in the positive width direction.
Each second core has a central portion, a short wing extending from the central portion in the negative width direction, and a long wing extending from the central portion in the positive width direction.
An elastic crawler in which the position of the outer end in the width direction of the long wing is outside in the width direction from the position of the outer end in the width direction of the ground contact surface. The elastic crawler according to claim 1, wherein the first core metal and the second core metal are alternately arranged along the circumferential direction. The elastic crawler according to claim 1 or 2, wherein the distance between the position of the outer end in the width direction of the long blade and the outer edge of the main portion is 30 mm or less. The elastic crawler according to any one of claims 1 to 3, wherein the position of the outer end in the width direction of the short blade is inside in the width direction from the position of the outer end in the width direction of the ground contact surface. The elastic crawler according to any one of claims 1 to 4, wherein the difference between the length of the long blade and the length of the short blade is 10 mm or more. The elastic crawler according to any one of claims 1 to 5, wherein the difference between the length of the long blade and the length of the short blade is 40 mm or less. The elastic crawler according to any one of claims 1 to 6, wherein the vicinity of the outer end of the long blade overlaps with one lug when the elastic crawler is viewed from the thickness direction. The elastic crawler according to any one of claims 1 to 7, wherein when the elastic crawler is viewed from the thickness direction, the total number of the first core metal and the second core metal on which the lugs overlap is 3 or more. The elastic crawler according to claim 8, wherein the lug overlaps with one first core and two second cores. Each has a pair of anti-book bodies that extend substantially in the circumferential direction.
One anti-book body is located directly under the long wing of the first core metal and the short wing of the second core metal, and the other anti-book body is the short wing of the first core metal and the long wing of the second core metal. Located directly below,
The elastic crawler according to any one of claims 1 to 9, wherein the thickness of the short blade is smaller than the thickness of the long blade. Each lug has a front slope located in front of the ground plane in the direction of rotation.
The elastic crawler according to any one of claims 1 to 10, wherein the front slope is a substantially flat surface in a zone outside the width direction of the position of the outer end in the width direction of the short wing. Each lug has a front slope located in front of the ground plane in the direction of rotation.
The elastic crawler according to any one of claims 1 to 11, wherein the angle of the front slope with respect to the width direction is 40 ° or more and 60 ° or less in the zone outside the width direction of the position of the outer end in the width direction of the short wing.

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