JP2002178964A - Elastic crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the bending performance of an elastic crawler having cores embedded in a crawler body formed into an endless belt of a rubber elastic body in spaced relation in the peripheral direction of the crawler and transverse restriction protrusions for engaging the cores to restrict the cores neighboring each other in the peripheral direction of the crawler from being transversely dislocated in the cross direction of the crawler. SOLUTION: A groove 17 extending to the width direction B of the crawler is provided on the inner periphery side of the crawler body 8, outward to the transverse restriction protrusions 15, 16 in the width direction B of the crawler. Central portions of the transverse restriction protrusions 15, 16 in the thickness direction F of the crawler are located on the inner periphery side D of the crawler beyond the centers of cords 10a constituting a tensile body 10.

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 unit for civil engineering / construction machines such as shovels, backhoes and carrier dumps, and agricultural machines such as tractors. It is.

[0002]

2. Description of the Related Art A crawler-type traveling device includes an endless belt-shaped crawler belt including one front and rear drive wheel, another front and rear idler, and a rolling wheel disposed between the drive wheel and the idler. The main structure is wound around. As a crawler belt of the crawler type traveling device, a large number of cores are embedded in the crawler body formed in an endless belt shape by rubber over the entire circumference of the crawler in the circumferential direction and at appropriate intervals from each other. Elastic crawler.

In this elastic crawler, a lateral regulating protrusion is provided from one of the core bars adjacent in the crawler circumferential direction to the other, and is engaged with the lateral regulating protrusion from the other to one in the crawler width direction. Lateral regulating projections are provided so that the lateral regulating projections restrict lateral displacement of the metal cores in the crawler width direction to prevent the wheels from falling off (the elastic crawler comes off the rollers). There is something.
The lateral regulation protrusions are provided on the crawler width direction center side of the core bar and on the front and rear surfaces in the crawler circumferential direction, respectively.A pair of lateral regulation protrusions are embedded in the rubber crawler body, and the crawler body is It is protected by the formed rubber layer (rubber reinforcement layer).

[0004] The inner peripheral surface of the crawler body on the outer side in the crawler width direction of the lateral regulating protrusion is formed to be substantially flat.

[0005]

In the prior art, in order to protect the lateral regulation protrusion and to emphasize crack resistance, the thickness of the rubber on the inner circumferential side of the crawler of the lateral regulation protrusion is increased to some extent. Accordingly, the thickness of the crawler body on the outer side in the crawler width direction of the lateral regulation protrusions has also been increased, thereby deteriorating the flexibility of the elastic crawler, and reducing the horsepower loss and the elastic crawler main body. There is a problem that the assemblability to the side is deteriorated. Also, when the thickness of the rubber on the inner peripheral side of the crawler of the lateral regulation protrusion is reduced, crack resistance,
Poor cut resistance.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to improve the flexibility of an elastic crawler provided with a lateral regulation projection while taking into consideration cut resistance.

[0007]

The technical means taken by the present invention to solve the technical problem is that a core metal is provided in a crawler body formed in an endless belt shape with a rubber-like elastic body in a circumferential direction of the crawler. An elastic crawler buried at intervals and provided with lateral regulating protrusions for engaging the core metals adjacent to each other in the crawler circumferential direction to restrict lateral displacement in the crawler width direction. A groove extending in the crawler width direction is provided on the outer side in the crawler width direction of the lateral regulation protrusion, and the center of the lateral regulation protrusion in the crawler thickness direction is located within the crawler with respect to the center of the cord constituting the tensile member. It is characterized by being located on the circumferential side.

It is preferable that the end of the lateral regulating projection on the inner peripheral side of the crawler is located closer to the inner peripheral side of the crawler than the bottom of the groove. Further, a pair of left and right engaging projections projecting toward the inner peripheral side of the crawler is provided at the center side of the core metal in the crawler width direction, and the outer side in the crawler width direction of the left and right engaging projections is a rolling wheel rolling surface. May be formed so as to extend outward from the wheel rolling surface in the crawler width direction. Also, on the outer peripheral side of the core metal in the crawler thickness direction, a tensile body that surrounds the core metal,
Embedded in the crawler body in the crawler circumferential direction,
Assuming that the distance in the crawler thickness direction from the tensile member to the groove bottom is e and the distance from the tensile member to the surface of the crawler body on the crawler outer peripheral side is f, the relationship between these e and f is
It is preferable that e / f = 0.7 to 1.6.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 2, 1 is a shovel,
It is a crawler-type traveling device that is used as a traveling unit for civil engineering / construction machines such as backhoes and carrier dumps and agricultural machines such as tractors. The crawler-type traveling device 1 includes a drive wheel (sprocket) 3 disposed on one side in the front and rear direction of travel (left and right direction in FIG. 2), an idler 4 disposed on the other side in the front and rear direction of travel, and A plurality of rolling wheels 5 disposed between the idler 4 and the idler 4 are rotatably supported on left and right side frames of a track frame (not shown) so as to be rotatable around an axis in a left-right direction (a direction penetrating the drawing sheet of FIG. 2). An endless crawler belt 7 is wound around the driving wheel 3, idler 4 and rolling wheel 5, and the main structure of the machine employing the crawler type traveling device 1 is the weight of the machine from the machine side. The load acts on the crawler belt 7 via the rolling wheel 5 and advances by rotating and driving the drive wheel 3 so that the crawler belt 7 circulates in the circumferential direction.

In this crawler type traveling apparatus 1, an elastic crawler (rubber crawler) is employed as the crawler belt 7. As shown in FIGS. 3 and 4, the elastic crawler 7 includes a large number of metal cores 9 inside a crawler body 8 formed of an elastic band or the like formed endlessly by a rubber-like elastic body (rubber, resin, or the like). It is mainly configured by embedding the tensile body 10. The metal core 9 is formed to be long in the crawler width direction B (left-right direction), and is disposed at appropriate intervals over the entire circumference of the crawler circumferential direction A.

The tensile member 10 is formed by winding a single end tensile strength cord 10a made of a tensile strength wire material such as a steel cord one round in the crawler circumferential direction A so as to be parallel in the crawler width direction B. And a spiral structure in which one tensile cord 10a is wound several times in the crawler circumferential direction A while being displaced in the crawler width direction B, and the crawler body 8 is used. Inside the crawler in the crawler width direction B (both right and left sides) and on the crawler outer peripheral side C of the core 9, the core 9 is surrounded.

A pair of right and left engagement projections 11 projecting from the crawler body 8 to the crawler inner peripheral side D are provided at the center of the core bar 9 in the crawler width direction B and on the inner peripheral side D of the crawler. The engagement protrusion 20 is a guide portion for preventing the wheel 5 from coming off. In this crawler-type traveling device 1, the outer side of the left and right engagement projections 11 in the crawler width direction B is
The rolling wheel 5 is arranged so as to straddle the left and right engaging protrusions 11, and as shown in FIG. 8, the tops of the left and right engaging protrusions 11 (the inner circumferential side of the crawler) as shown in FIG. D surface) may be the wheel rolling surface 13.

In the illustrated example, the rolling wheel 5 rolls on the mandrel 9, but as shown in FIG. 5, the place where the rolling wheel 5 of the mandrel 9 rolls is an elastic body (crawler body 8). ). A lug 12 integrally extending from the crawler body 8 is provided on a crawler outer peripheral side C of the elastic crawler 7, and a driving wheel 3 is provided between the cores 9 and at the center in the crawler width direction. Are formed with engagement holes 14 for transmitting the driving force.

Each core bar 9 is provided with a pair of left and right lateral regulating projections 15 and 16 which protrude in the crawler circumferential direction A and are embedded in the crawler body 8 on the front and rear surfaces of the crawler circumferential direction A. . In the illustrated example, the left and right lateral regulating protrusions 15 and 16 are provided at positions substantially corresponding to the positions of the left and right engaging protrusions 11, but are displaced from the left and right engaging protrusions 11 in the crawler width direction B. It may be provided at a position.
The left-right space between the left and right lateral regulating protrusions 15 in the front and rear of the crawler circumferential direction A is formed narrower than the left-right space of the other left and right lateral regulating protrusion 16 in the front and rear of the crawler circumferential direction A. Is located on the inner side of the adjacent cored bar 9 in the crawler width direction B of the other left and right lateral regulation projections 16 in the crawler circumferential direction A of the adjacent cored bar 9, and in the crawler widthwise direction of the adjacent cored bar 9. B is prevented from being largely displaced, and the wheel 5 is prevented from coming off (preventing the elastic crawler 7 from coming off the wheel 5).

On the inner peripheral surface side of the crawler body 8, between the core metals 9 adjacent to the outer side of the lateral regulation protrusions 15 and 16 in the crawler width direction B and in the crawler width direction B, in the crawler width direction B. An extending groove 17 is formed. By forming the groove 17, the flexibility of the elastic crawler 7 is improved, the horsepower loss is reduced, and the driving wheels 3 and
The assemblability to the idler 4 and the wheel 5 is improved. Regarding the flexibility, the dimension H shown in FIG. 6 was improved by 26% by employing a groove 17 having a width G = 7 mm with a crawler having a width of 30.

Further, since the groove 17 is formed on the outer side of the lateral regulating protrusions 15 and 16 in the crawler width direction B, the crawler body 8 of the lateral regulating protrusions 15 and 16 on the inner and outer peripheral sides D and C of the crawler. The thickness can be ensured, and the cut resistance of the lateral regulation protrusions 15 and 16 on the inner and outer peripheral sides D and C of the crawler does not deteriorate. Further, when the crawler-type traveling device 1 is increased in size, the length h of the lateral regulation protrusions 15 and 16 in the crawler thickness direction F is increased.
16 are formed outside the crawler width direction B,
Of the lateral regulation protrusions 15 and 16 on the inner and outer rims D and C of the crawler,
The thickness of the crawler body 8 can be ensured, and the cut resistance of the inner and outer rims D and C of the crawler can be ensured.

The width G of the groove 17 and the crawler width direction B
The length is formed to an optimum size according to the width and thickness of the elastic crawler 7. Further, the groove 17 is disclosed as extending linearly in the crawler width direction, but is not limited to this, and may be inclined in an oblique direction with respect to the crawler width direction. It may not be in a shape, and may be bent or meandered on the way. Further, in the illustrated example, the grooves 17 are formed on both left and right sides between the metal cores 9, but may be formed on at least one side on the left and right sides. However, it may be provided between the selected metal cores 9 (for example, one provided in a staggered or the like in the crawler circumferential direction A).

In the elastic crawler 7 shown in FIG. 1, the center of the lateral regulation projections 15 and 16 in the crawler thickness direction F is
The lateral restraint protrusion 1 is located on the crawler inner peripheral side D by a distance d from the center of the tensile cord 10 a constituting the tensile member 10.
5 and 16 are located on the inner peripheral side D in the crawler thickness direction F with respect to the tensile body 10, and the inner end side of the tensile body 10 in the crawler width direction B is on the outer peripheral side C of the lateral regulation protrusions 15 and 16. positioned. Further, the groove 17 is formed so as to extend outward in the crawler width direction B from the wheel rolling surface 13.

The lateral regulating protrusions 15 and 16 are located on the inner peripheral side D of the crawler from the bottom of the groove 17 (lateral regulating protrusion 1).
The end faces on the inner peripheral side D of the crawler in the thickness direction F are grooves 17.
(It is located on the crawler inner peripheral side D from the bottom, and the end portions C of the lateral regulation protrusions 15 and 16 on the outer peripheral side in the crawler thickness direction F are located on the crawler inner peripheral side D from the bottom of the groove 17). The distance b (groove depth) in the crawler thickness direction F between the end face of the crawler inner peripheral side D of the crawler main body 8 and the bottom of the groove 17 at the position where the lateral regulation protrusions 15 and 16 are formed is the groove 17.
Is larger than the distance a (groove depth) in the crawler thickness direction F between the end of the crawler width direction B and the bottom of the groove 17.

In order to improve the derailment resistance, the lateral regulation protrusion 1
The length h of the crawler in the thickness direction F must be increased. However, if the length h is increased toward the ground contact side (crawler outer peripheral side B), this portion of the crawler body 8 at the time of bending is located on the tread side (crawler outer peripheral side B). The surface elongation increases, and the cut resistance deteriorates. Further, when the width is increased toward the crawler inner peripheral side D, the thickness of the rubber between the lateral regulation protrusions 15 and 16 and the surface of the crawler inner peripheral side D of the crawler body 8 is reduced, and the elastic crawler 7 rides on a stone or the like. At the time of the reverse bending of the elastic crawler 7, which occurs at times, it is easy to be cut by pebbles or the like.

Therefore, by making the groove depth b on the inner side in the crawler width direction B (on the side of the lateral regulation protrusions 15 and 16) larger than the groove depth a on the outer side in the crawler width direction B, the cut resistance is improved. Is kept and the life is extended. The same can be said for the case where the crawler traveling device 1 is increased in size and the length h of the lateral regulation protrusions 15 and 16 in the crawler thickness direction F is increased. FIG. 7 shows another embodiment of the elastic crawler 7. In this elastic crawler 7, a central portion of the lateral regulation protrusions 15 and 16 in the crawler thickness direction F and the tensile member 10 are formed. The distance d from the center of the tensile strength cord 10a is small, and the tensile body 10 is located outside the lateral regulation protrusions 15, 16 in the crawler width direction B.

A step 18 is formed on the inner peripheral side D of the crawler on a surface of the engaging hole 14 opposed in the crawler width direction B. The distance b in the crawler thickness direction F between the end face of the crawler inner peripheral side D of the crawler body 8 and the bottom of the groove 17 at the position where the lateral regulation protrusions 15 and 16 are formed is determined by the distance between the end of the groove 17 in the crawler width direction B and the groove. 17 with crawler thickness direction F
Is formed smaller than the distance a. Since the extension of the rubber on the outer circumferential side C of the crawler at the time of bending is greater than that of the rubber on the inner circumferential side D of the crawler, the crawler thickness direction from the center of the tensile strength cord 10 a constituting the tensile member 10 to the bottom of the groove 17. The relationship between the distance e to F and the distance f from the center of the tensile strength cord 10a constituting the tensile body 10 to the surface of the crawler body 8 on the crawler outer peripheral side C is e / f = 0.7.
.About.1.6.

FIG. 8 shows another embodiment, in which the surface on the top side of the engagement projection is the rolling surface 13 as described above, and the crawler width direction B of the rolling wheel 5 is changed. The distance L from the outer end surface to the outer end of the groove 17 in the crawler width direction is set to be larger than that of the above-described embodiment. FIG. 9 shows another embodiment, and as shown in FIG.
The left and right engaging projections 15 provided on one of the front and rear sides of the crawler circumferential direction A are provided as a pair so as to sandwich the other engaging projection 16 of the adjacent cored bar 9 from both left and right sides. e / f = 2/3.

FIGS. 11 to 15 disclose a crawler-type traveling device 1 employing a shoe crawler as the crawler belt 7. Hereinafter, the crawler-type traveling device 1 shown in FIGS. 11 to 15 will be described. In FIG. 11, the crawler-type traveling device 1 includes a track frame 2, a driving wheel (sprocket) 3 disposed on one side in the front-rear direction of the crawler-type traveling device 1 (left-right direction in FIG. 11), An idler 4 disposed on the other side, a plurality of rolling wheels 5 and 6 disposed between the driving wheel 3 and the idler 4, and the driving wheel 3, the idler 4 and the rolling wheels 5 and 6 An endless crawler belt 7 to be wound around and an upper roller 21 for supporting the upper side of the crawler belt 7 from below.

The drive wheel 3, idler 4, wheels 5, 6 and upper roller 21 are supported by the track frame 2 so as to be rotatable around the axis in the left-right direction (the direction perpendicular to the plane of FIG. 11). Further, a load such as the weight from the machine side of the machine employing the crawler type traveling device 1 acts on the crawler belt 7 via the rolling wheels 5 and 6. Further, the driving wheel 3, the idler 4,
The rolling wheels 5 and 6, the crawler belt 7, and the upper roller 21 are usually provided on both left and right sides of the track frame 2.

As described above, the crawler-type traveling device 1 employs, as the crawler belt 7, a shoe crawler constituted by connecting a number of crawler shoes 22 to each other endlessly. The crawler shoe 22 is provided on an elastic pad (ground contact body) 23 which receives a load upon contact with the ground, and on the inner peripheral side D (anti-ground surface side) of the elastic pad 23 in the crawler thickness direction F and on the center side in the crawler width direction B. And a pair of left and right track links 24. The elastic pad 23 is formed of a rubber-like elastic body (rubber, resin, or the like), and is provided with a pad body 23A that is grounded and provided with a core material 23B made of a hard plate material such as metal. The track link 24 is fixed to the material 23B via the plate 25 (or directly), and the track links 24 of the crawler shoes 22 adjacent to each other in the crawler circumferential direction A are connected to each other via a connecting pin 26 having a horizontal axis. , The crawler shoes 22 are mutually connected.

The left and right track links 24 have a smaller left and right spacing on one side of the crawler circumferential direction A than the left and right gaps on the other side of the crawler circumferential direction A. A bush 27 having an axial center in the left and right direction is penetrated, and one side of the crawler circumferential direction A of the left and right track link 24 is connected to the crawler circumferential direction A of the right and left track link 24 of the crawler shoe 22 adjacent to the crawler shoe 22 in the crawler circumferential direction A. It is inserted between the sides. Then, the left and right track links 24 and the bush 27
The connecting pin 26 through the crawler circumferential direction A
The track links 24 of the adjacent crawler shoes 22 are pivotally connected to each other.

The rolling wheels 5 and 6 are composed of a first rolling wheel 5 rolling on the left and right track links 24 and a left and right track link 2.
4 in the crawler width direction B. There are second rolling wheels 6 rolling on both sides in the crawler width direction B. The first rolling wheels 5 and the second rolling wheels 6 are alternately arranged in the traveling direction of the crawler type traveling device 1. . The core material 23B of the elastic pad 23 has a track link 24 on the front side.
Are fixed, and a rib 29 in the crawler width direction B provided on the back side of the base 28. The pad body 23 is provided on the rib forming side of the base 28.
A is baked.

Although three ribs 29 are provided in the illustrated example, one, two, or four or more ribs 29 may be provided. Both ends of each rib 29 in the crawler width direction B are moved outward from the crawler width direction B to the crawler inner peripheral side D.
The cut portion 30 formed by cutting the corner (cutting the corner) is formed so as to form an inclined surface that transitions to.
By using the crawler-type traveling device 1 (running), the rubber constituting the pad body 23A starts to be chipped from the end of the rib 29 in the crawler width direction B and gradually becomes crawler in the crawler width direction B as shown in FIG. Spread to the center, core material 2
Although 3B is exposed and finally becomes unusable, FIG.
As shown in FIG. 20, if the corner of the rib 29 is not cut, the rubber chip 31 at the end of the rib 29 is formed.
Starts early (particularly, rubber chipping starts at the end of the center rib 29), and the life of the elastic pad 23 is short. However, by cutting the end of the rib 29, the pad body in this portion is cut. The rubber thickness of the rubber 23 </ b> A is increased (by attaching a rubber gauge), the rubber chipping from the end of the rib 29 is delayed, and the life of the elastic pad 23 is extended.

Since the rubber chipping starts from the end of the central rib 29, the life of the elastic pad 23 is extended by cutting at least the end of the central rib 29. Only the end of the rib 29 may be cut. Further, a hole 32 is formed in the base 28 between the ribs 29, and the hole 32 is filled with rubber constituting the pad body 23A. The peelability is improved. The thickness of the cut portion 30 of the pad body 23A is larger than the thickness of the other portions.

The core material 23B may be a cast product or the like. However, by using a drawn steel plate and cutting the end portion by post-processing, the inexpensive core material 23B makes it possible to use the inexpensive elastic pad 23. Can be formed. The distance K in the crawler width direction B between the start end and the end of the cut portion 30 is 5
The thickness is preferably 100 mm, but is not limited thereto. FIGS. 16 to 18 show modified examples of the elastic pad 23. Hereinafter, differences between the elastic pad 23 and the elastic pad 23 will be described.

In the embodiment shown in FIG. 16, the core material 23B
Cover part 33 covering the end of the pad body 23 from the outer side in the crawler width direction B to the inner peripheral side D in the crawler thickness direction F.
A. In addition, the cut portion 30 is
8 is cut away from a position separated by a predetermined distance M.
Further, a first inclined portion 34 which is inclined at the end of the pad body 23A in the crawler width direction B and on the crawler outer peripheral side C so as to shift to the crawler inner peripheral side D toward the outer side of the crawler width direction B, From the outer end of the first inclined portion 34 in the crawler width direction B, there is formed a second inclined portion 35 which is inclined so as to move toward the crawler inner peripheral side D as going outward in the crawler width direction B. .

FIG. 17 is different from the first embodiment in that a covering portion 33 is formed and a corner R of a cut portion 30 is provided with a radius R. Note that the entire cut portion 30 may be formed in an arc shape. FIG. 18 shows that a rib 29 is provided with a radius R and that the pad body 23
A is different from A in that a first inclined portion 34 and a second inclined portion 35 are provided.

[0034]

According to the present invention, a core metal is buried at intervals in the crawler circumferential direction in a crawler body formed of an endless band of rubber-like elastic material, and is adjacent to each core metal in the crawler circumferential direction. In an elastic crawler provided with a lateral restricting projection that engages to restrict lateral displacement of the mating metal cores in the crawler width direction, the crawler width is located on the inner peripheral side of the crawler body and outwardly of the lateral restricting projection in the crawler width direction. Since a groove extending in the direction is provided,
Even if the elastic crawler has the lateral regulation protrusion, the flexibility is good, and the assembling property to the machine side is good.

Further, by providing the groove on the outer side in the crawler width direction of the lateral regulating projection, the thickness of the crawler body on the inner peripheral side and outer peripheral side of the lateral regulating projection can be ensured, and cut resistance can be secured. Nature can be secured.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part.

FIG. 2 is a side view of the crawler type traveling device.

FIG. 3 is a development view of an inner peripheral side of the elastic crawler.

FIG. 4 is a sectional view taken along line EE of FIG. 3;

FIG. 5 is a cross-sectional view of an elastic crawler according to a modification.

FIG. 6 is a side view of an elastic crawler.

FIG. 7 is a cross-sectional view of an elastic crawler according to another embodiment.

FIG. 8 is a sectional view of an elastic crawler according to another embodiment.

FIG. 9 is a cross-sectional view of an elastic crawler according to another embodiment.

FIG. 10 is a sectional view taken along the line II of FIG. 9;

FIG. 11 is a side view of a crawler traveling device according to a disclosed example.

FIG. 12 is a side view of a part of a crawler traveling device according to a disclosed example.

FIG. 13 is a development view of an inner circumferential side of a crawler belt according to a disclosed example.

FIG. 14 is a sectional view taken along line GG of FIG. 12;

FIG. 15 is a perspective view of an elastic pad according to a disclosure example.

FIG. 16 is a sectional view of an elastic pad according to a disclosure example.

FIG. 17 is a cross-sectional view of an elastic pad according to a disclosure example.

FIG. 18 is a cross-sectional view of an elastic pad according to a disclosure example.

FIG. 19 is a cross-sectional view of an elastic pad according to a disclosure example.

FIG. 20 is a cross-sectional view of an elastic pad according to a disclosure example.

[Explanation of symbols]

 Reference Signs List 8 Crawler body 9 Core 10 Tensile body 10a Tensile cord 11 Engagement projection 13 Roller rolling surface 15 Lateral regulation projection 16 Lateral regulation projection 17 Groove A Crawler circumferential direction B Crawler width direction C Crawler outer circumferential side D Crawler inner circumferential side F Crawler thickness direction

Claims (4)

[Claims] 1. A crawler which is embedded in a crawler body formed of a rubber-like elastic body into an endless belt at intervals in a crawler circumferential direction, and a crawler adjacent to each core in the crawler circumferential direction. In an elastic crawler provided with a lateral regulation protrusion that engages to regulate the lateral displacement in the width direction, a groove extending in the crawler width direction is provided on the inner peripheral side of the crawler body on the outer side in the crawler width direction of the lateral regulation protrusion. In addition, an elastic crawler characterized in that a central portion of the lateral regulation projection in the crawler thickness direction is located on the inner circumferential side of the crawler with respect to a center of a cord forming the tensile member. 2. The elastic crawler according to claim 1, wherein an end of the lateral regulation protrusion on the inner peripheral side of the crawler is located closer to the inner peripheral side of the crawler than a bottom of the groove. 3. A pair of left and right engaging projections projecting toward the inner peripheral side of the crawler are provided at the center of the cored bar in the crawler width direction, and the outer sides of the left and right engaging projections in the crawler width direction are the rolling contact surfaces. The elastic crawler according to claim 1, wherein the groove is formed so as to extend outward from the wheel rolling surface in the crawler width direction. 4. A tension member surrounding the core metal is embedded in the crawler body in the crawler circumferential direction on the outer peripheral side of the core metal in the crawler thickness direction, and the tension member extends from the tension member to the groove bottom. Assuming that the distance in the crawler thickness direction is e and the distance from the tensile member to the crawler outer peripheral surface of the crawler body is f, the relationship between e and f is e / f = 0.7 to 1.6. The elastic crawler according to any one of claims 1 to 3, wherein