KR20200034591A - Elastic crawler - Google Patents

Abstract

The present invention aims to provide an elastic crawler (4) which is able to prevent durability from declining and achieves an enhancement of productivity. According to the present invention, the elastic crawler (4) comprises: a plurality of plate-shaped core metals (22) which are arranged in a circumferential direction at some intervals; and a cord layer (24) which is extended from an external side of the core metals in a circumferential direction. The cord layer (24) includes a plurality of loop-shaped units (40) which are parallelly arranged in a widthwise direction. Each of the units (40) is made of a strap-shaped upper body (36) which is in the shape of a strap wound and rolled in a spiral shape for two rounds or more. The strap-shaped upper body (36) includes at least one piece of steel cord (34). A starting end (42) and an ending end (44) of the strap-shaped upper body (36) constituting the units (40) are placed right on one of the core metals (22).

Description

Elastic Crawler {ELASTIC CRAWLER}

The present invention relates to an elastic crawler. Specifically, the present invention relates to an elastic crawler mounted on a traveling device such as agricultural machinery or construction machinery.

A crawler-type traveling device such as an agricultural machine such as a combine or a tractor or a construction machine such as a backhoe is equipped with an endless band-shaped elastic crawler.

In the traveling device, the elastic crawler moves in the circumferential direction as the sprocket rotates. The traveling device thereby travels.

The elastic crawler is, for example, as disclosed in Patent Document 1, an elastic member made of crosslinked rubber, a plurality of core metals arranged at intervals in the circumferential direction, and extending in the circumferential direction from the outside of the core metal The code layer is provided. In the elastic crawler, the core metal and the cord layer are embedded in the elastic member.

In the elastic crawler, the cord layer has an endless band shape and includes a steel cord. As this code layer, for example, a cord layer is formed by arranging a number of steel cords in parallel in the width direction to form a cord bundle, and joining both ends of the cord bundle (hereinafter, a non-jointless type cord layer). However, a cord layer (hereinafter referred to as a jointless type cord layer) obtained by spirally winding a band-shaped body containing a steel cord in a circumferential direction is known.

Patent Document 1: Japanese Patent Publication No. 2015-131536

In the running state, a significant tension acts on the cord layer. In the elastic crawler employing the non-jointless type cord layer described above, since the joint portion contains a large number of seams of the steel cord, there is a fear that the strength of the joint portion is insufficient and sufficient durability cannot be obtained.

On the other hand, since the jointless-type cord layer does not have a joint of steel cord, this cord layer has sufficient strength throughout. For this reason, if it is an elastic crawler employing a jointless type cord layer, there is a possibility that good durability can be obtained. However, a band-like body having a sufficient length is required to form this cord layer. For this reason, according to the specifications of the elastic crawler to be manufactured, it is necessary to prepare a belt-shaped body whose length is adjusted, and there is a possibility that many intermediate products are generated. In addition, since the band-like body having insufficient length cannot be used for forming the cord layer, it must be discarded. An elastic crawler employing a jointless type cord layer tends to be inferior in productivity compared to an elastic crawler employing a non-jointless type cord layer.

This invention is made | formed in view of such a situation, and it aims at providing the elastic crawler which improves productivity, suppressing the fall of durability.

The preferred elastic crawler according to the present invention includes a plurality of plate-shaped core metals arranged at intervals in the circumferential direction, and a cord layer extending in the circumferential direction from the outside of the core metal.

In this elastic crawler, the cord layer includes a plurality of loop-shaped units arranged in parallel in the width direction, and each unit is formed of a belt-shaped body wound two or more turns in a spiral, and the belt-shaped body is at least 1 Includes stranded steel cord.

And in this elastic crawler, the start and end of the band-shaped body constituting the unit is disposed directly on any one of the core metals.

Preferably, in this elastic crawler, immediately above one core metal, the end of one band-shaped body constituting one unit and the starting end of another band-shaped body constituting another unit located adjacent to the one unit This is arranged to face.

Preferably, in this elastic crawler, the cord layer includes a first zone in which the number of cross-sections of the band-shaped body included in the cross-section of the cord layer is large, and a second zone in which the number of cross-sections of the band-shaped body included in the cross-section is small. It is composed. The circumferential length of the first zone is shorter than the circumferential length of the second zone.

Preferably, in this elastic crawler, the start and end of the band-like body are located in the first zone.

Preferably, in this elastic crawler, with respect to the number of cross-sections of the band-like body included in the cross-section of the cord layer in the second zone, immediately above the one core metal, the band-like different from the end of one band-like body The ratio of the number of parts arranged so that the upper body tip faces is 1% or more and 50% or less.

Preferably, in this elastic crawler, the circumferential direction between the end of one strip-shaped body and the starting end of the other strip-shaped body, which is disposed opposite to and above the one of the core metal, with respect to the circumferential length of the core metal The ratio of the length is 50% or less.

In the elastic crawler of the present invention, a band-like body containing at least one strand of steel cord is used for forming the cord layer. In particular, this code layer is configured by combining a plurality of units obtained by spirally winding a band-shaped body. In this elastic crawler, it is not necessary to prepare a strip-like body having a sufficient length, as in the above-mentioned jointless type cord layer. In this elastic crawler, the bobbin used for storage of the belt-like body can be miniaturized. Since the length of the band-like body is insufficient to form a cord layer that cannot be used for the formation of the cord layer, the waste amount of the band-like body can also be reduced. This elastic crawler can contribute to the improvement of productivity.

In this elastic crawl, each unit constituting the cord layer is formed of a belt-like body wound two or more turns in a spiral. This unit has a jointless structure. The seam joint of the steel cord is not included in this unit. In this code layer, the number of seams of steel cords is smaller than that of the non-jointless type code layer described above. The strength of this elastic crawler is sufficiently greater than that of an elastic crawler employing a non-jointless type cord layer. In addition, by controlling the number of joints of the steel cord, this elastic crawler can obtain the same strength as the elastic crawler employing the above-mentioned jointless type cord layer.

In addition, in this elastic crawler, the start and end of the band-shaped body constituting the unit are disposed directly on one of the core metals. In this elastic crawler, the deformation of the portion where the starting or end of the steel cord is located is suppressed, so that the tip of the steel cord is prevented from jumping out.

In this elastic crawler, although the cord layer contains a seam of a steel cord, the effect of the cord layer on durability is effectively suppressed. This elastic crawler can improve productivity while suppressing decrease in durability.

ADVANTAGE OF THE INVENTION According to this invention, the elastic crawler which can improve productivity while suppressing the fall of durability can be obtained.

1 is a side view showing a part of a traveling device equipped with an elastic crawler according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the elastic crawler of FIG. 1.
3 is a perspective view of a portion of the band-like body for the cord layer.
4 is a plan view for explaining the structure of a code layer.
5 is a cross-sectional view of a cross-section of the code layer.
6 is a side view for explaining the structure of the code layer.
7 is a plan view for explaining a modification of the code layer.

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

[Driving device]

1 shows a part of the crawler type traveling device 2. Examples of the traveling device 2 include agricultural machinery such as combines and tractors, and construction machinery such as backhoes. The traveling device 2 includes an elastic crawler 4, a sprocket 6, an idler 8, and a front wheel 10.

The elastic crawler 4 has an endless belt shape. The elastic crawler 4 is provided with a hole 12 in its central portion in the width direction. In this elastic crawler 4, a large number of holes 12 are arranged at intervals in the circumferential direction. The sprocket 6 and the idler 8 are disc-shaped, and are rotatably supported by the main body of the traveling device 2. The sprocket 6 has a number of teeth 14 on its outer circumference.

In this traveling device 2, the elastic crawler 4 is wound around the sprocket 6 and the idler 8. Accordingly, a predetermined tension is applied to the elastic crawler 4.

In this traveling device 2, the sprocket 6 is rotated by driving means not shown. Thereby, the teeth 14 of the sprocket 6 sequentially enter the holes 12 of the elastic crawler 4. As the teeth 14 entering the hole 12 move in the rotational direction of the sprocket 6, the elastic crawler 4 moves in the circumferential direction. Accordingly, the traveling device 2 travels. Then, as the elastic crawler 4 moves, the idler 8 rotates.

In this traveling device 2, a plurality of front wheels 10 are arranged on the road surface side. These front wheels 10 are located between the sprocket 6 and the idler 8. These front wheels 10 are rotatably supported by the main body of the traveling device 2. In this traveling device 2, these front wheels 10 roll and move on the inner circumferential surface of the elastic crawler 4 moving in the circumferential direction.

[Elastic crawler (4)]

FIG. 2 shows a cross-section of the elastic crawler 4 along line II-II in FIG. 1. In Fig. 2, a cross section of this elastic crawler 4 is shown along a plane perpendicular to the circumferential direction of the elastic crawler 4.

In Fig. 2, the left and right directions are the width direction of the elastic crawler 4. In Fig. 2, the vertical direction is the thickness direction of the elastic crawler 4. As shown in Fig. 1, the elastic crawler 4 constitutes a loop. The upper side in Fig. 2 is the inner side of this loop, and the lower side in this Fig. 2 is the outer side of this loop. In Fig. 2, the direction perpendicular to the ground is the circumferential direction of the elastic crawler 4. The circumferential direction of the elastic crawler 4 is also the longitudinal direction of the elastic crawler 4. The circumferential direction of this elastic crawler 4 is orthogonal to the width direction.

The elastic crawler 4 has a lug 16 and a guide 18 as well as the above-described hole 12 as a geometric element.

The lug 16 protrudes outwardly from the main body 4a of the elastic crawler 4. The lugs 16 extend in the approximately width direction of this elastic crawler 4. As shown in Fig. 1, in this elastic crawler 4, a plurality of lugs 16 are arranged at intervals in the circumferential direction. The lugs 16 contribute to the traction of the traveling device 2.

The guide 18 protrudes inward from the main body 4a of the elastic crawler 4. As shown in Fig. 1, in this elastic crawler 4, a plurality of guides 18 are arranged at intervals in the circumferential direction. As shown in Fig. 2, in the width direction, two guides 18 are arranged at intervals in the central portion of the elastic crawler 4. The two guides 18 sandwich the sprocket 6 in the running state of the elastic crawler 4. Accordingly, displacement in the width direction of the elastic crawler 4 is suppressed. The guide 18 contributes to the running stability of the traveling device 2.

The elastic crawler 4 includes, as a constitutional element, an elastic member 20, a core metal 22, a cord layer 24, and a canvas layer 26.

The elastic member 20 is made of crosslinked rubber. The elastic member 20 covers the core metal 22, the cord layer 24, and the canvas layer 26. In this elastic crawler 4, the core metal 22, the cord layer 24 and the canvas layer 26 are embedded in the elastic member 20.

The core metal 22 is plate-shaped. The core metal 22 includes a pair of flange portions 28 and a pair of wing portions 30. A pair of flange part 28 is arrange | positioned in the center part of this core metal 22 in the width direction. 2, each flange part 28 protrudes inward from the base part 32 of the core metal 22. As shown in FIG. In this elastic crawler 4, the flange portion 28 of the core metal 22 forms part of the guide 18 described above. The pair of wing parts 30 are plate-shaped. Each of the wing portions 30 extends outward in the width direction from the base portion 32. In this elastic crawler 4, the lugs 16 described above are configured outside the core metal 22.

In this elastic crawler 4, the core metal 22 is made of metal. As the material of the core metal 22, ordinary steel and alloy steel are exemplified.

The elastic crawler 4 includes a plurality of core metals 22. These core metals 22 are arranged at intervals in the circumferential direction.

The cord layer 24 extends in the circumferential direction. The cord layer 24 has an endless band shape. In the width direction, the outer end of the cord layer 24 is disposed to be located inside the outer end of the core metal 22.

The cord layer 24 includes a steel cord 34. In this cord layer 24, the steel cord 34 extends substantially in the circumferential direction. In the present invention, "substantially in the circumferential direction" means that the angle formed by the steel cord 34 with respect to the circumferential direction is 5 ° or less. In this elastic crawler 4, from the viewpoint of securing the rigidity of the cord layer 24, the angle formed by the steel cord 34 with respect to the circumferential direction is preferably 3 ° or less, and more preferably 2 ° or less.

In this elastic crawler 4, the steel cord generally used in the elastic crawler is used as the steel cord 34. Although not shown, in this elastic crawler 4, a cord constructed by twisting several strands of strands constituted by twisting together several strands of filaments is used as the steel cord 34.

In this elastic crawler 4, the cord layer 24 is located outside the core metal 22. 2, this elastic crawler 4 is provided with a pair of cord layers 24. As shown in FIG. Each cord layer 24 extends in the circumferential direction from the outside of each wing portion 30 provided on the left and right sides of the core metal 22.

The canvas layer 26 is located inside or outside the cord layer 24 on the outside of the core metal 22 and extends in the circumferential direction. The canvas layer 26 is shaped like an endless band.

This canvas layer 26 is a fabric. Although not shown, the canvas layer 26 includes a canvas cord made of organic fibers. Examples of the organic fiber include nylon fiber, polyester fiber, rayon fiber, and aramid fiber. In this elastic crawler 4, the canvas cord is inclined with respect to the circumferential direction. The inclination angle of this canvas cord is usually set in a range of 20 ° to 70 °. Preferably, the inclination angle of this canvas cord is 30 degrees.

This elastic crawler 4 is provided with a pair of canvas layers 26. Each canvas layer 26 extends along the cord layer 24 on the outside of each wing portion 30 provided on the left and right sides of the core metal 22. As shown in Fig. 2, the canvas layer 26 of this elastic crawler 4 is constructed by surrounding the cord layer 24 with the above-described fabric. The canvas layer 26 covers the cord layer 24. In this elastic crawler 4, the canvas layer 26 is located between the core metal 22 and the cord layer 24, that is, inside the cord layer 24 and outside the cord layer 24. In this elastic crawler 4, the canvas layer 26 may be provided only inside the cord layer 24. The canvas layer 26 may be provided only outside the cord layer 24.

As described above, the cord layer 24 extends from the outside of the wing portion 30 of the core metal 22 in the circumferential direction. The cord layer 24 includes a steel cord 34 that extends substantially in the circumferential direction. In this elastic crawler 4, the cord layer 24 is constructed using the band-shaped body 36 shown in FIG. The strip-shaped body 36 includes at least one strand of steel cord 34. In this strip-shaped body 36, the steel cord 34 is covered with a topping rubber 38. The belt-shaped body 36 is made of a steel cord 34 and a topping rubber 38.

The strip-shaped body 36 shown in FIG. 3 includes two strands of steel cords 34. In this strip-shaped body 36, these steel cords 34 line up in parallel in the width direction. In this elastic crawler 4, the belt-like body 36 may include a plurality of steel cords 34 arranged in parallel in the width direction.

In this elastic crawler 4, the number of strands of the steel cord 34 included in the band-like body 36 is from the viewpoint of contributing to the improvement of productivity and obtaining a cord layer 24 having sufficient rigidity. Two or more strands are preferred. The number of strands of the steel cord 34 included in the band-like body 36 is preferably 5 or less, more preferably 4 or less, and even more preferably 3 or less.

In FIG. 4, a part of the cord layer 24 is shown together with the core metal 22. In Fig. 4, the left-right direction is the width direction of the elastic crawler 4, and the up-down direction is the circumferential direction of the elastic crawler 4. The direction perpendicular to the ground is the thickness direction of the elastic crawler 4. The outer side of this ground is the outer side of the loop constituted by this elastic crawler 4.

In this specification, the structure of the code layer 24 will be described based on the code layer 24a on the left side shown in FIG. 4. In this elastic crawler 4, the code layer 24b on the right also has a configuration equivalent to that of the code layer 24a on the left.

In this elastic crawler 4, the cord layer 24 includes a plurality of loop-shaped units 40 arranged in parallel in the width direction. The code layer 24 shown in FIG. 4 includes three units 40. In this elastic crawler 4, the unit 40a located inside in the width direction is the first unit 40a, and the unit 40b located outside the width direction of the first unit 40a is second. The unit 40b is a unit 40c located outside the width direction of the second unit 40b, and the third unit 40c. The code layer 24 is composed of a first unit 40a, a second unit 40b, and a third unit 40c. In this elastic crawler 4, the first unit 40a is a unit 40 located inside the width direction among the plurality of units 40 constituting the cord layer 24. The third unit 40c is a unit 40 located at the outermost side in the width direction among the plurality of units 40 constituting the code layer 24.

In this elastic crawler 4, the unit 40 forming a part of the cord layer 24 is configured by winding the band-shaped body 36 in a spiral manner and turning it. In other words, the unit 40 is composed of a band-like body 36 wound in a spiral. In Fig. 4, the direction indicated by the arrow A is the circumferential direction of the band-like body 36 constituting the cord layer 24. In this elastic crawler (4), the cord layer (24) is formed by winding each of the band-shaped bodies (36) toward the circular direction (A).

In the code layer 24 shown in FIG. 4, the first unit 40a, the second unit 40b and the third unit 40c, that is, all units 40 constituting the code layer 24, respectively It consists of a belt-shaped body (36) wound in a spiral two or more turns. In this elastic crawler 4, the belt-shaped body 36a for the first unit 40a is called the first belt-shaped body 36a, and the belt-shaped body 36b for the second unit 40b is the second belt-shaped body It is called (36b), and the belt-shaped body 36c for the third unit 40c is called the third belt-shaped body 36c.

In the present invention, the number of wheels of the belt-shaped body 36 is the number of times this belt-shaped body 36 passes through the position of the starting end 42 of the belt-shaped body 36 in the winding of the belt-shaped body 36. It can be obtained by counting. Further, even if the position of the end 44 of the belt-like body does not coincide with the position of the end 42 in the circumferential direction, the end 44 is the same as the core metal 22 on which the end 42 is disposed. When disposed immediately above the core metal 22, the position of this end 44 is assumed to coincide with the position of the starting end 42 in the circumferential direction, and the number of wheels of the belt-like body 36 is counted.

In this elastic crawler 4, the unit 40a located inside in the width direction, that is, the first unit 40a is configured using the first band-like body 36a. In this elastic crawler 4, the starting end 42a of the first band-like body 36a is disposed directly above the wing portion 30 of any core metal 22 included in the elastic crawler 4. . In this elastic crawler 4, the core metal 22a on which the starting end 42a of the first band-like body 36a is disposed is called the first core metal 22a.

In the cord layer 24 shown in FIG. 4, the starting end 42a of the first band-like body 36a is disposed directly above the wing portion 30 of the first core metal 22a. The first strip-shaped body 36a is wound three turns in a spiral, and the end 44a of the first strip-shaped body 36a is in the circular direction A, and the neighborhood of the first core metal 22a It is disposed just above the wing portion 30 of the other core metal 22b (hereinafter referred to as the second core metal 22b). Thereby, the 1st unit 40a can be obtained.

In the elastic crawler 4, the first belt-shaped body 36a is wound at least two turns, and the end 44a of the first belt-shaped body 36a is any one included in the elastic crawler 4 There is no particular limitation on the position of the end 44a of the first strip-shaped body 36a as long as it is disposed directly on the wing portion 30 of the core metal 22. For example, the end 44a of the first band-like body 36a may be disposed directly on the first core metal 22a where the starting end 42a is disposed. Even if the end 44a of the first strip-shaped body 36a is disposed immediately above another core metal 22c (hereinafter, the third core metal 22c) located in the neighborhood of the second core metal 22b. good. Even if the end 44a of the first band-shaped body 36a is disposed immediately above another core metal 22d (hereinafter, the fourth core metal 22d) located in the neighborhood of the third core metal 22c. good.

In this elastic crawler 4, the 2nd unit 40b is comprised using the 2nd band-shaped object 36b after the 1st unit 40a. In the cord layer 24 shown in FIG. 4, the starting end 42b of the second strip-shaped body 36b is the wing of the second core metal 22b, on which the end 44a of the first strip-shaped body 36a is disposed. It is arranged just above the portion 30. The second strip-shaped body 36b is wound three turns in a spiral shape, and the end 44b of the second strip-shaped body 36b is disposed directly above the wing portion 30 of the third core metal 22c. Thereby, the 2nd unit 40b can be obtained.

In this elastic crawler 4, as in the above-described first belt-like body 36a, the second belt-like body 36b is wound around at least two turns, and the end 44b of the second belt-like body 36b is, There is no particular limitation on the position of the end 44b of the second band-like body 36b as long as it is disposed directly above the wing portion 30 of any one of the core metals 22 included in the elastic crawler 4. .

In this elastic crawler 4, following the 2nd unit 40b, the 3rd unit 40c is comprised using the 3rd belt-shaped object 36c. In the cord layer 24 shown in FIG. 4, the starting end 42c of the third band-shaped body 36c is the wing of the third core metal 22c, on which the end 44b of the second band-shaped body 36b is disposed. It is arranged just above the portion 30. The third strip-shaped body 36c is wound three turns in a spiral, and the end 44c of the third strip-shaped body 36c is disposed directly above the wing portion 30 of the fourth core metal 22d. Thereby, the 3rd unit 40c can be obtained.

In this elastic crawler 4, like the above-described first belt-like body 36a and second belt-like body 36b, the third belt-like body 36c is wound around at least two turns, and this third belt-like body 36c ), The end 44c of the third strip-shaped body 36c is provided if the end 44c is disposed just above the wing 30 of any one of the core metals 22 included in the elastic crawler 4 ) Is not particularly limited.

In this elastic crawler 4, in this way, the cord layer 24 can be obtained by sequentially constructing the units 40 using several strands of band-like bodies 36.

In this elastic crawler 4, a band-like body 36 including at least one strand of steel cord 34 is used for forming the cord layer 24. In particular, the cord layer 24 is configured by combining a plurality of units 40 obtained by spirally winding the band-shaped body 36. In this elastic crawler 4, it is not necessary to prepare a strip-like body having a sufficient length, like a conventional jointless type cord layer. In this elastic crawler 4, the size of the bobbin used for storage of the belt-shaped body 36 can be reduced. In the production of the elastic crawler 4, because the length is insufficient, it is difficult to generate the band-shaped body 36 which cannot be used for the formation of the cord layer 24, so the waste amount of the band-shaped body 36 can also be reduced. This elastic crawler 4 can contribute to the improvement of productivity.

In this elastic crawler 4, each unit 40 constituting the cord layer 24 is formed of a band-like body 36 wound two or more turns in a spiral. This unit 40 has a jointless structure. The seam of the steel cord 34 is not included in this unit 40. For this reason, in the code layer 24, the number of seams of the steel cord 34 is smaller than that of the conventional non-jointless type code layer. The strength of this elastic crawler 4 is sufficiently greater than that of an elastic crawler employing a non-jointless type cord layer. Further, by controlling the number of seams of the steel cord 34, the elastic crawler 4 can also obtain the same strength as that of the elastic crawler employing the above-mentioned jointless type cord layer.

And in this elastic crawler 4, the starting end 42 and the end 44 of the band-like body 36 constituting the unit 40 are disposed directly above any one of the core metals 22. In this elastic crawler 4, since deformation of the part where the starting end or the end of the steel cord 34 is located is suppressed, the jumping of the end portion of the steel cord 34 (hereinafter, the jumping of the steel cord 34) Also called.) Is effectively prevented. As described above, in the elastic crawler 4, the lugs 16 described above are configured outside the core metal 22. Therefore, in this elastic crawler 4, the deformation of the portion where the starting end or the end of the steel cord 34 is located is effectively suppressed by the lugs 16 on the core metal 22, so that the steel cord 34 protrudes. Ascension is more effectively prevented.

In this elastic crawler 4, although the cord layer 24 contains a seam of the steel cord 34, the influence of the cord layer 24 on durability is effectively suppressed. This elastic crawler 4 can improve productivity while suppressing a decrease in durability.

In this elastic crawler 4, as shown in FIG. 4, for example, just above the second core metal 22b, the end 44a of the first band-shaped body 36a constituting the first unit 40a and , The starting end 42b of the second band-shaped body 36b constituting the second unit 40b located in the neighborhood of the first unit 40a is disposed to face each other. In this elastic crawler 4, the end 44a of the first strip-shaped body 36a is disposed directly above the second core metal 22b, and the starting end 42b of the second strip-shaped body 36b is the second. It may be arranged directly on the third core metal 22c located in the neighborhood of the core metal 22b. The end 44a of the first strip-shaped body 36a is disposed immediately above the second core metal 22b, and the starting end 42b of the second strip-shaped body 36b is further adjacent to the third core metal 22c. It may be arranged just above the fourth core metal 22d.

In this elastic crawler 4, the end 44 of one band-like body 36 constituting one unit 40 and the other unit 40 located in the neighborhood of this one unit 40 are constituted. The spacing between the starting ends 42 of the other band-like bodies 36 to be affected affects the rigidity of the cord layer 24. In this elastic crawler 4, from the viewpoint of securing the rigidity of the cord layer 24, just above the core metal 22, the end of one band-like body 36 constituting one unit 40 ( It is preferable that the starting end 42 of the other strip-shaped body 36 constituting the other unit 40 located in the neighborhood of 44 and this one unit 40 is arranged to face each other.

As shown in FIG. 4, in this elastic crawler 4, the starting end 42b of the second band-like body 36b is just above the second core metal 22b, and the end of the first band-like body 36a is terminated. It is arranged at intervals in the circumferential direction from (44a). The starting end 42c of the third strip-shaped body 36c is disposed immediately above the third core metal 22c and spaced in the circumferential direction from the end 44b of the second strip-shaped body 36b. In this elastic crawler 4, the starting end 42b of the second band-shaped body 36b and the end 44a of the first band-shaped body 36a are directly above the second core metal 22b, without spacing. You may work. The starting end 42c of the third strip-shaped body 36c and the end 44b of the second strip-shaped body 36b may be pasted immediately above the third core metal 22c without being spaced apart.

In Fig. 4, both arrows LM are the circumferential lengths of the core metal 22. The double-arrow LD is the gap between the end 44 of one strip-shaped body 36 and the starting end 42 of the other strip-shaped body 36, which is arranged to face, directly above one core metal 22, In other words, it is the length of the seam of the unit 40 in the circumferential direction.

In this elastic crawler 4, in addition to the rigidity of the cord layer 24, the circumferential length LD of the seam of the unit 40 affects the springing of the steel cord 34. In this elastic crawler 4, from the viewpoint that the deformation of the seam is effectively suppressed by the core metal 22 and the bouncing of the steel cord 34 is more effectively prevented, the length of the circumferential length of the core metal 22 is ( The ratio of the circumferential length LD of the seam of the unit 40 to LM) is preferably 50% or less. In addition, when the end 44 of one strip-shaped body 36 and the starting end 42 of the other strip-shaped body 36 are pasted, the circumferential length LD is 0 mm, so this ratio is 0% or more. to be.

In this elastic crawler 4, from the viewpoint of preventing the jumping of the steel cord 34, the core metal 22 is a band-shaped body 36, specifically, a steel cord included in the band-shaped body 36 ( 34) and overlap each other sufficiently. Specifically, the ratio of the overlapping length of the strip-shaped body 36 and the core metal 22 to the circumferential length LM of the core metal 22 is preferably 25% or more, and preferably 50% or less.

5 shows a cross-section of the cord layer 24. In Fig. 5 (a), a cross section of the code layer 24 along the line a-a in Fig. 4 is shown. 5 (b), a cross section of the code layer 24 along the line b-b in FIG. 4 is shown. In Fig. 5, the left-right direction is the width direction of the elastic crawler 4, and the up-down direction is the thickness direction of the elastic crawler 4. The direction perpendicular to the ground is the circumferential direction of this elastic crawler 4.

In this elastic crawler 4, the third unit 40c from the starting end 42a of the first belt-shaped body 36a constituting the first unit 40a along the circular direction A of the belt-shaped body 36 In the zone to the end 44c of the third band-shaped body 36c constituting (hereinafter, also referred to as the first zone Z1), as shown in Fig. 5 (a), the code layer 24 The number of cross sections of the strip-shaped body 36 included in the cross section of is 10. Since the strip-shaped body 36 includes two strands of steel cord 34, the number of sections of the steel cord 34 included in the cross section of the cord layer 24 in this first zone Z1 is 20.

In this elastic crawler 4, the first unit 40a from the end 44c of the third band-shaped body 36c constituting the third unit 40c, which follows the circular direction A of the belt-shaped body 36, is the first unit 40a. In the zone from the first band-shaped body 36a to the starting end 42a (hereinafter also referred to as the second zone Z2), as shown in Fig. 5 (b), the code layer 24 is formed. The number of cross-sections of the strip-shaped body 36 included in the cross-section of is 9. Since the strip-shaped body 36 includes two strands of steel cord 34, the number of sections of the steel cord 34 included in the cross section of the cord layer 24 in this second zone Z2 is 18.

In this elastic crawler 4, the number of cross sections of the band-like body 36 included in the cross section of the code layer 24 in the first zone Z1 is the code layer in the second zone Z2 ( More than the number of cross sections of the band-like body 36 included in the cross section of 24). In the cord layer 24 of the elastic crawler 4, the first zone Z1 having a large number of cross-sections of the band-like body 36 included in the cross section of the cord layer 24, and the cross section of the cord layer 24 A second zone Z2 having a small number of cross-sections of the band-shaped body 36 included in is formed.

In FIG. 6, the cord layer 24 in the elastic crawler 4 attached to the traveling apparatus 2 is shown. In Fig. 6, the position indicated by the symbol PS is the position of the end 44c of the third band-like body 36c constituting the third unit 40c. The position indicated by the symbol PU indicates a position corresponding to the starting end 42a of the first band-like body 36a constituting the first unit 40a. Both arrows LZ1 are the circumferential lengths of the above-described first zone Z1, and both arrows LZ2 are the circumferential lengths of the above-described second zone Z2. In this elastic crawler 4, the sum of the circumferential length LZ1 of the first zone Z1 and the circumferential length LZ2 of the second zone Z2 is the circumferential length of the cord layer 24.

As described above, in the second zone Z2, the number of cross-sections of the band-like body 36 included in the cross section of the cord layer 24 is smaller than that of the first zone Z1. The stiffness of the second zone Z2 is lower than that of the first zone Z1.

As shown in FIG. 6, the circumferential length LZ1 of the first zone Z1 is shorter than the circumferential length LZ2 of the second zone Z2. In other words, the ratio of the circumferential length LZ1 of the first zone Z1 to the circumferential length LZ1 + LZ2 of the code layer 24 is less than 0.5. In this elastic crawler 4, the cord layer 24 is mainly composed of the second zone Z2, so the influence on the rigidity of the cord layer 24 by the second zone Z2 is suppressed. In this elastic crawler 4, good durability is maintained. From this viewpoint, in this elastic crawler 4, the first zone Z1 having a large number of cross-sections of the band-like body 36 included in the cross-section of the cord layer 24 and the band-like body 36 included in the cross-section The second zone Z2 having a small number of cross sections is formed in the cord layer 24, and the circumferential length LZ1 of the first zone Z1 is circumferential length LZ2 of the second zone Z2. It is preferred to be shorter than).

In this elastic crawler 4, from the viewpoint that the effect on the stiffness of the cord layer 24 by the second zone Z2 is effectively suppressed, the agent for the circumferential length LZ1 + LZ2 of the cord layer 24 is suppressed. The ratio of the circumferential length LZ1 of the 1 zone Z1 is preferably 0.4 or less. From the viewpoint that the highly rigid first zone Z1 can effectively contribute to the rigidity of the cord layer 24, the first zone Z1 to the circumferential length LZ1 + LZ2 of the cord layer 24 The ratio of the circumferential length LZ1 is preferably 0.1 or more, and more preferably 0.2 or more.

As described above, in the first zone Z1, the number of cross-sections of the band-like bodies 36 included in the cross-section of the cord layer 24 is greater than the second zone Z2, and the first zone Z1 is the second. It has a higher rigidity than the zone Z2.

As shown in FIG. 4, in this elastic crawler 4, the starting end 42a and the end 44a of the first band-like body 36a, the starting end 42b and the end 44b of the second band-like body 36b ), And the starting end 42c and the end 44c of the third band-like body 36c, that is, the starting end 42 and the end 44 of all the band-like bodies 36 constituting the cord layer 24 are high. It is located in the first zone Z1 having rigidity. In this elastic crawler 4, the influence on the stiffness of the cord layer 24 by the starting end 42 and the end 44 of the band-like body 36 is effectively suppressed. In this elastic crawler 4, good durability is maintained. From this point of view, in this elastic crawler 4, the starting end 42 and the end 44 of all the band-like bodies 36 constituting the cord layer 24 are included in the cross-section of the cord layer 24. It is preferable to be located in the first zone Z1 having a large number of sections (36).

As shown in Fig. 4, in this elastic crawler 4, three strands of the first belt-like body 36a, the second belt-like body 36b, and the third belt-like body 36c, 36, The code layer 24 is constructed. In the first zone Z1 of the cord layer 24, the joints of the first strip-shaped body 36a and the second strip-shaped body 36b, and the second strip-shaped body 36b and the third strip-shaped body 36c There is a seam. In other words, in the first zone Z1, immediately above one core metal 22, the end 44 of one band-like body 36 and the starting end 42 of the other band-like body 36 face each other. There are two locations.

In this elastic crawler 4, the cord layer 24 is composed of three strands of the band-like body 36, but when it is assumed that the cord layer 24 is composed of one strand of the band-like body, the cord layer 24 ), Nine loops are formed by this band-like body. In this elastic crawler 4, a loop of the same number of sections as the number of sections of the band-like body 36 included in the section of the cord layer 24 in the second zone Z2 is formed in the cord layer 24. . One core to the ratio of the number of seams described above to the number of the loops, that is, the number of cross sections of the band-like body 36 included in the cross section of the cord layer 24 in the second zone Z2 Directly above the metal 22, the ratio of the number of portions of the end 44 of one strip-shaped body 36 and the tip end 42 of the other strip-shaped body 36 facing each other is equal to that of the elastic crawler 4. It affects productivity and durability.

In this elastic crawler 4, one core is equivalent to the number of cross sections of the band-like bodies 36 included in the cross section of the cord layer 24 in the second zone Z2 from the viewpoint of improving its productivity. Directly above the metal 22, the ratio of the number of portions arranged such that the ends 44 of one strip-shaped body 36 and the starting end 42 of the other strip-shaped body 36 face each other is preferably 1% or more. , 5% or more is more preferable. From the viewpoint that the reduction in durability of the elastic crawler 4 is effectively suppressed, this ratio is preferably 50% or less, and more preferably 35% or less.

In Fig. 7, a modification of the code layer 24 shown in Fig. 4 is shown. In FIG. 7, a part of the code layer 52 as a modification of the code layer 24 is shown together with the core metal 22. In this FIG. 7, the left-right direction is the width direction of the elastic crawler 4, and the up-down direction is the circumferential direction of the elastic crawler 4. The direction perpendicular to the ground is the thickness direction of this elastic crawler 4. The outer side of this ground is the outside of the loop that this elastic crawler 4 constitutes. Hereinafter, a modification of this code layer 24 will be described based on the code layer 52a on the left side shown in FIG. 7, but in this elastic crawler 4, the code layer 52b on the right side is also on the left side. It has a structure equivalent to that of the code layer 52a.

The code layer 52 includes four loop-type units 54 arranged in parallel in the width direction. Of these four units 54, the unit 54a located at the innermost in the width direction is the first unit 54a, and the unit 54b located at the outer side in the width direction of the first unit 54a is The unit 54c that is the second unit 54b and located outside the width direction of the second unit 54b is the third unit 54c, and the unit that is located outside the width direction of the third unit 54c 54d is the fourth unit 54d. In this code layer 52, the fourth unit 54d is the unit 54 located at the outermost side in the width direction among the plurality of units 54 constituting the code layer 52.

In this cord layer 52 as well, the unit 54 is configured by winding the band-shaped body 56 in a spiral two or more turns.

In the code layer 52 shown in FIG. 7, the starting end 58a of the first band-like body 56a is disposed directly above the wing portion 30 of the first core metal 22a. The first strip-shaped body 56a is wound two turns in a spiral, and the end 60a of the first strip-shaped body 56a is disposed just above the wing portion 30 of the first core metal 22a. Thereby, the 1st unit 54a can be obtained.

In this code layer 52, the 2nd unit 54b is comprised using the 2nd band-shaped body 56b after the 1st unit 54a. In this cord layer 52, the starting end 58b of the second strip-shaped body 56b is the wing portion 30 of the first core metal 22a, on which the end 60a of the first strip-shaped body 56a is disposed. Is placed just above. The second strip-shaped body 56b is wound three turns in a spiral, and the end 60b of the second strip-shaped body 56b is disposed directly above the wing portion 30 of the second core metal 22b. Thereby, the 2nd unit 54b can be obtained.

In this code layer 52, the 3rd unit 54c is comprised using the 3rd band-shaped body 56c after the 2nd unit 54b. In this cord layer 52, the starting end 58c of the third strip-shaped body 56c is the wing portion 30 of the second core metal 22b, on which the end 60b of the second strip-shaped body 56b is disposed. Is placed just above. The third strip-shaped body 56c is wound and rotated two times in a spiral, and the end 60c of the third strip-shaped body 56c is disposed directly on the wing portion 30 of the second core metal 22b. Thereby, the 3rd unit 54c can be obtained.

In this code layer 52, the 4th unit 54d is comprised using the 4th band-shaped body 56d following the 3rd unit 54c. In this cord layer 52, the starting end 58d of the fourth strip-shaped body 56d is the wing portion 30 of the second core metal 22b, on which the end 60c of the third strip-shaped body 56c is disposed. Is placed just above. The fourth strip-shaped body 56d is wound and rotated three times in a spiral, and the end 60d of the fourth strip-shaped body 56d is disposed directly above the wing portion 30 of the third core metal 22c. Thereby, the 4th unit 54d can be obtained.

In this elastic crawler 4, in this way, the code layer 52 can be obtained by sequentially constructing the units 54 using the multi-stranded band-like body 56. The cord layer 52 is formed by alternately combining a unit 54 formed by winding the belt-shaped body 56 two turns and a unit 54 formed by winding the belt-shaped body 56 three turns. .

In Fig. 7, the zone indicated by the symbol Z1 is the first zone Z1 described above. As shown in FIG. 7, in this code layer 52, the first strip-shaped body 56a constituting the first unit 54a and the second strip-shaped body 56b constituting the second unit 54b The seam of is located outside the first zone Z1, that is, in the second zone Z2 described above.

In the present invention, in the width direction that is the reference position of the first zone Z1, the core metal 22 on which the leading end 58 of the belt-shaped body 56 located at the innermost side is disposed, or the belt-shaped located at the outermost side When the seam of the band-shaped body 56 is located directly above the same core metal 22 and the core metal 22 where the end 60 of the upper body 56 is disposed, this seam is the first zone It is considered as a seam contained in (Z1). Therefore, in the code layer 52 shown in FIG. 7, the seams of the first band-like body 56a constituting the first unit 54a and the second band-like body 56b constituting the second unit 54b are , It is treated as a seam located in the first zone Z1. In the code layer 52 shown in FIG. 7, the starting end 58 and the end 60 of all the band-like bodies 56 constituting the code layer 52 are included in the cross section of the code layer 52. It is located in the first zone Z1 where the number of cross-sections of the band-like body 56 to be large is large.

Also in the elastic crawler 4 having the cord layer 52, a band-like body 56 including at least one strand of steel cord 34 is used for forming the cord layer 52. In particular, the code layer 52 is configured by combining a plurality of units 54 obtained by spirally winding the band-shaped body 56. In this elastic crawler 4, it is not necessary to prepare a strip-like body having a sufficient length, like a conventional jointless type cord layer. In this elastic crawler 4, the size of the bobbin used for storage of the belt-shaped body 56 can be reduced. Since the band-shaped body 56 that is insufficient in length and cannot be used for the formation of the cord layer 52 is unlikely to be generated, the waste amount of the band-shaped body 56 can also be reduced. This elastic crawler 4 can contribute to the improvement of productivity.

In this elastic crawler 4, each unit 54 constituting the cord layer 52 is formed of a belt-like body 56 wound in a spiral two or more turns. This unit 54 has a jointless structure. The seam of the steel cord 34 is not included in this unit 54. For this reason, in this code layer 52, the number of seams of the steel cord 34 is smaller than that of a conventional non-jointless type code layer. The strength of this elastic crawler 4 is sufficiently greater than that of an elastic crawler employing a non-jointless type cord layer. Further, by controlling the number of seams of the steel cord 34, the elastic crawler 4 can obtain the same strength as that of the elastic crawler employing the above-mentioned jointless type cord layer.

And in this elastic crawler 4, the starting end 58 and the end 60 of the band-shaped body 56 constituting the unit 54 are disposed directly on one of the core metals 22. In this elastic crawler 4, since deformation of the part where the starting end or the end of the steel cord 34 is located is suppressed, the springing of the steel cord 34 is effectively prevented.

In this elastic crawler 4, although the cord layer 52 contains a seam of the steel cord 34, the effect of the cord layer 52 on durability is effectively suppressed. This elastic crawler 4 can improve productivity while suppressing a decrease in durability.

As described above, according to the present invention, it is possible to obtain an elastic crawler 4 capable of improving productivity while suppressing a decrease in durability. From the viewpoint that the bouncing of the steel cord 34 is effectively suppressed, the present invention exerts a remarkable effect, particularly in a large-sized combine with a large sprocket diameter.

The embodiment disclosed this time is an illustration and restrictive at no points. The technical scope of the present invention is not limited to the above-described embodiment, and this technical scope includes all modifications within the scope equivalent to the structure described in the claims.

[Example]

Hereinafter, the present invention will be described in more detail by examples, but the present invention is not limited to these examples.

[Example 1]

An elastic crawler having the basic configuration shown in FIG. 2 was produced. In this Example 1, the cord layer was produced using two strands of a strip-like body containing one strand of steel cord and having the same length. Each strip-shaped body was wound around 10 turns in a spiral shape, and in this cord layer, two loop-type units lined up in parallel in the width direction were formed.

In this embodiment 1, the starting and ending of the belt-shaped body constituting each unit is the same as shown in Fig. 4, and the starting end of the first belt-shaped body is disposed directly above the wing portion of the first core metal, and this first The end of the strip-shaped body was disposed directly on the second core metal. The starting end of the second strip-shaped body is disposed directly on the wing portion of the second core metal, and the end of the second strip-shaped body is disposed directly on the third core metal. Therefore, in this Embodiment 1, just above the second core metal, the ends of the first strip-shaped body constituting the first unit and the second strip-shaped body constituting the second unit located adjacent to the first unit Sidan was deployed to face. In this code layer, the number of seams of the strip-shaped body is 1.

In the code layer of Example 1, the number of loops formed by the band-like body, that is, the number of cross-sections of the band-like body included in the cross-section of the code layer in the second zone was set to 20. The portion of the region where the end of one band-like body and the end of the other band-like body are arranged to face the number of cross-sections of the band-like body included in the cross-section of the cord layer in the second zone. The number, that is, the ratio of the number of seams of the strip-shaped body (unit) is 5%. This is shown in the ratio column of the seams in Table 1 below.

In this example 1, since the number of steel cords contained in the strip-like body is one strand, the number of loops constituted by this steel cord is 20.

[Comparative Example 1]

The elastic crawler of Comparative Example 1 was obtained in the same manner as in Example 1, except that a cord layer was formed by making 20 strands of a single-stranded band including one strand of steel cord. This comparative example 1 is a conventional elastic crawler, and the code layer of this comparative example 1 is a conventional jointless type code layer. The band-shaped seam is not provided in this cord layer. In this comparative example 1, the joint ratio was 0%.

[Comparative Example 2]

An elastic crawler of Comparative Example 2 was obtained in the same manner as in Example 1, except that a cord layer was formed by arranging 20 strands of steel cords in parallel in the width direction to form a cord bundle and joining both ends of the cord bundle. . This comparative example 2 is a conventional elastic crawler, and the code layer of this comparative example 2 is a conventional non-jointless type code layer. In the code layer, 20 seams of the cord were formed. In this comparative example 2, the seam ratio was 100%.

[Example 2]

The elastic crawler of Example 2 was obtained in the same manner as in Example 1, except that the cord layer was formed using a 5-stranded band-like body including one strand of steel cord. In the cord layer of Example 2, each strip-shaped body was wound around four turns, and the number of seams of the strip-shaped body was set to four. In this Example 2, the seam ratio was 20%.

[Example 3]

The elastic crawler of Example 3 was obtained in the same manner as in Example 1, except that a cord layer was formed using a 10-stranded band-like body containing one strand of steel cord. In the code layer of Example 3, each band-shaped body was wound around two turns, and the number of seams of the belt-shaped body was set to 9. In Example 3, the seam ratio was 45%.

[Example 4]

The elastic crawler of Example 4 was obtained in the same manner as in Example 1, except that a cord layer was formed using a two-stranded band-like body comprising two strands of steel cord. In the chord layer of Example 4, each band-shaped body was wound around five turns, and the number of seams of the belt-shaped body was set to one. In this example 4, the proportion of the seams is 10%. In addition, in the fourth embodiment, the number of loops constituted by the steel cord is 20, which is the same as that of the first embodiment.

[Breaking force]

The tensile breaking force of the elastic crawler was evaluated using a tensile tester. The results are shown in Index in Table 1 below. The larger the value, the larger the breaking force, and the preferable.

[Bending stiffness]

The bending stiffness of the elastic crawler was evaluated using a compression tester. The portion containing the first zone of the cord layer was sampled from the elastic crawler, and this was used as a provided sample. We prepared a disc modeled after the sprocket. The load required when the provided sample was wound around this disk was measured to obtain the maximum value of the load as an index of bending stiffness. The results are shown in Index in Table 1 below. The larger the value is, the larger the bending stiffness is.

[Bounce]

The flexural tester was used to evaluate the bouncing of the steel cord in the elastic crawler. The portion containing the first zone of the cord layer was sampled from the elastic crawler, and this was used as a provided sample. The sample provided was repeatedly bent to measure the time until the steel cord bounces. The results are shown in Index in Table 1 below. The larger the value, the more likely it is that the steel cord does not bounce.

[productivity]

The length of the band-like body and the time taken to form the cord layer required for the construction of the unit as an indicator of the waste-like amount of the belt-like body are represented by an index based on Comparative Example 1, and a total value is calculated. The reciprocal of this total value was expressed as an index to evaluate productivity. The results are shown in Index in Table 1 below. The larger the value, the better the productivity and is preferable. In Comparative Example 1, the index was calculated by substituting the length of the band-shaped body required for the construction of the cord layer with the length of the band-shaped body required for the construction of the unit. In Comparative Example 2, the index was calculated by substituting the length of the strip-shaped body required for the construction of the unit with the length of one strand of steel cord included in the cord layer.

[Comprehensive Performance]

The sum of the indices obtained in each evaluation was calculated. The results are shown in Index in Table 1 below. The larger the value, the better.

As shown in Table 1, in Examples, productivity can be improved while suppressing a decrease in durability. The advantage of this invention is clear from the evaluation result.

The technique of the code layer described above can also be applied to various elastic crawlers.

2: traveling device 4: elastic crawler
6: Sprocket 8: Idler
10: front wheel 12: hole
16: Rug 18: Guide
20: elastic member 22: core metal
24, 52: code layer 26: canvas layer
28: flange portion 30: wing portion
34: steel cord 36, 56: strip
40, 54: unit 42: band-shaped body 36 start
44: end of strip-shaped body 36 54: unit
58: Start of the belt-shaped body 56 60: End of the belt-shaped body 56

Claims (6)

A plurality of plate-shaped core metals spaced in the circumferential direction,
Cord layer extending in the circumferential direction from the outside of the core metal
Equipped with,
The code layer includes a plurality of loop-type units arranged in parallel in the width direction,
Each unit is composed of a belt-shaped body wound two or more turns in a spiral,
The strip-shaped body, at least one strand of the steel cord,
Elastic crawler, the starting and end of the belt-shaped body constituting the unit is disposed immediately above any one of the core metal. According to claim 1,
Directly above one core metal, the ends of one strip-shaped body constituting one unit and the starting ends of the other strip-shaped bodies constituting other units located adjacent to the one unit are disposed to face each other. Elastic crawler. The method according to claim 1 or 2,
In the code layer, a first zone having a large number of cross-sections of a band-shaped body included in the cross-section of the cord layer and a second zone having a small number of cross-sections of a band-shaped body included in the cross-section are formed,
The elastic crawler having a circumferential length of the first zone shorter than a circumferential length of the second zone. According to claim 3,
An elastic crawler having a starting end and an end point of the band-shaped body is located in the first zone. According to claim 3,
The portion where the end of one band-like body and the end of the other band-like body are arranged opposite to the number of cross-sections of the band-like body included in the cross-section of the cord layer in the second zone. The ratio of the number of elastic crawler is 1% or more and 50% or less. According to claim 2,
The ratio of the circumferential length between the end of one strip-shaped body and the starting end of the other strip-shaped body, which is arranged to face, directly above the one core metal, to the circumferential length of the core metal is 50% or less. , Elastic crawler.

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