JP2007297010A - Elastic crawler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elastic crawler having high durability which is capable of preventing detachment of a track roller. <P>SOLUTION: A reinforcing plate 6 having a detachment preventive unit 7 from a driving projection 2 is provided on a surface layer of the driving projection 2 ranging from a top of the driving projection 2 to both sides in the crawler width direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a coreless elastic crawler used in various crawler type traveling devices.

2. Description of the Related Art A crawler type traveling device employed in a traveling unit of an agricultural machine, a construction machine, or the like is configured by winding an endless belt-like elastic crawler over a drive sprocket, an idler, and a plurality of wheels. Among these endless belt-like elastic crawlers, a coreless-less crawler body is provided with an endless belt-like crawler body with driving projections projecting from the inner peripheral surface, and a tensile body embedded inside the crawler body. There is known a structure in which a driving force is transmitted to a crawler body without loss by bridging a meshing member between driving protrusions and meshing a driving sprocket with the meshing member (see, for example, Patent Document 1).
Japanese Patent No. 3484678

When an agricultural machine or the like travels on a sloping ground or climbs over a protrusion on the road surface, the elastic crawler twists and the rolling wheels try to get over the driving protrusion. In the elastic crawler of Patent Document 1, the meshing member is disposed at the base of the drive protrusion, and the top of the drive protrusion is only an unreinforced elastic body. Therefore, when the elastic crawler is twisted, the top part of the drive protrusion is pushed by the roller wheel and deforms to cause wheel removal, and when the twist is repeated, the drive protrusion is damaged and durability is reduced. There's a problem.
SUMMARY OF THE INVENTION In view of the above-described problems of the prior art, an object of the present invention is to provide an elastic crawler that prevents a wheel from being removed and has high durability.

In order to achieve the above object, the present invention takes the following technical means.
That is, the present invention relates to a crawler body made of an endless belt-like rubber elastic body in which drive protrusions arranged at regular intervals in the crawler circumferential direction are integrally projected from an inner circumferential surface, and the crawler circumference within the crawler body. A coreless elastic crawler including a tension member embedded along a direction and through which a plurality of wheels arranged between a drive sprocket and an idler pass on both left and right sides of the drive protrusion in the crawler width direction. , Wherein a reinforcing plate having a drop-off preventing portion from the driving projection is provided on a surface layer of the driving projection extending from the top of the driving projection to both sides in the crawler width direction.

  According to the elastic crawler of the present invention, since the reinforcing plate is provided on the surface layer of the driving projection extending from the top of the driving projection to both sides in the crawler width direction, the top of the driving projection is reinforced with the reinforcing plate, When the rigidity of the entire drive projection including the reinforcing plate is increased and the elastic crawler is twisted, the top of the drive projection is not deformed by being pressed by the wheel, and the wheel can be prevented from being removed. Even when the elastic crawler is repeatedly twisted, the dropout prevention part prevents the reinforcement plate from falling off, so that the drive protrusion is not damaged and high durability can be obtained.

  The drop-off preventing portion in the present invention may be formed of a bent piece that enters the inside of the drive protrusion from the reinforcing plate, for example. In this case, even if the rolling wheel tries to ride on the driving protrusion, the bent piece that has entered the driving protrusion can suppress the displacement of the reinforcing plate and reliably prevent the falling off.

  The bent piece may be formed at, for example, an end portion or a middle portion of the reinforcing plate in the crawler width direction, or a plurality of locations at predetermined intervals in the crawler width direction of the reinforcing plate.

  The reinforcing plate preferably has a support hole into which an elastic body constituting the drive protrusion is introduced. Thereby, the shift | offset | difference of a reinforcement plate is suppressed more.

  In the present invention, the drop-off prevention portion may be formed of a recess formed at an edge in the crawler circumferential direction of the reinforcing plate and into which an elastic body constituting the drive protrusion is introduced.

Further, the drop-off preventing portion according to the present invention includes a reinforcing support plate that is embedded in the driving projection and extends between both side portions of the reinforcing plate corresponding to both sides of the driving projection in the crawler width direction. The support plate may have a support hole into which an elastic body constituting the drive protrusion is introduced.
In this case, the reinforcing plate itself is reinforced by the reinforcing support plate, and the rigidity of the driving protrusion can be further increased. Moreover, since the elastic body which comprises a drive protrusion is introduce | transduced into the support plate hole which a reinforcement support plate has, the shift | offset | difference of a reinforcement plate is suppressed.

  The present invention provides a crawler body made of an endless belt-like rubber elastic body in which drive protrusions arranged at regular intervals in the crawler circumferential direction are integrally projected from an inner circumferential surface, and in the crawler circumferential direction inside the crawler body. In the elastic crawler without a cored bar, through which a plurality of wheels arranged between the drive sprocket and the idler pass on both the left and right sides in the crawler width direction of the drive protrusion, A reinforcing plate having a drop-off preventing portion from the drive protrusion is provided on the surface layer of the drive protrusion from the top of the drive protrusion to both sides in the crawler width direction and the front and rear portions in the crawler circumferential direction.

  According to the elastic crawler of the present invention, since the reinforcing plate is provided on the surface layer of the driving projection extending from the top of the driving projection to both sides in the crawler width direction, the top of the driving projection is reinforced with the reinforcing plate, When the rigidity of the entire drive projection including the reinforcing plate is increased and the elastic crawler is twisted, the top of the drive projection is not deformed by being pressed by the wheel, and the wheel can be prevented from being removed. Even when the elastic crawler is repeatedly twisted, the dropout prevention part prevents the reinforcement plate from falling off, so that the drive protrusion is not damaged and high durability can be obtained.

In the present invention, it is preferable that a corner portion of the reinforcing plate corresponding to the tip corner of the driving protrusion is formed in a curved shape along the corner.
In this case, the adhesion area between the reinforcing plate and the driving protrusion is increased, the adhesion of the reinforcing plate is improved, and the strength of the reinforcing plate is improved as compared with the case where the reinforcing plate is bent suddenly. Further, even if the wheel is going to ride on the drive protrusion, it can easily return to the original position along the curved surface, and the effect of preventing the wheel removal can be improved.

  In the present invention, the drive protrusion is preferably made of an elastic body in which short fibers are blended. In this case, the rigidity of the driving protrusion can be increased.

  In the present invention, the entire reinforcing plate may be embedded in the surface layer of the driving protrusion. In this case, the entire reinforcing plate is covered with the elastic body of the driving protrusion, and the falling off of the reinforcing plate can be reliably prevented.

  In the present invention, for example, the drive protrusion is substantially a / b ≧ 0.7 when the crawler width direction base end dimension of the drive protrusion is a and the crawler circumferential direction base end dimension is b. What is necessary is just to be formed in the shape of a quadrangular pyramid.

  As described above, according to the present invention, the top portion of the drive protrusion is provided on the surface layer of the drive protrusion extending from the top of the drive protrusion to both sides in the crawler width direction by providing the reinforcing plate having the drop prevention portion from the drive protrusion. While being reinforced, the rigidity of the entire drive protrusion including the reinforcing plate is increased, and the reinforcing plate is prevented from falling off, so that the wheel is prevented from being removed and high durability can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of an elastic crawler according to the present invention, and FIG. 2 shows a crawler traveling device 100 to which the elastic crawler 1 is attached. The crawler type traveling device 100 to which the elastic crawler 1 is attached includes a driving sprocket 101, an idler 102, and a wheel group including a plurality of wheels 103 arranged between the driving sprocket 101 and the idler 102. An elastic crawler 1 is wound around.

  The elastic crawler 1 is configured as a coreless, and has an endless belt-like crawler body 3 in which drive protrusions 2 arranged at regular intervals in the circumferential direction of the crawler are integrally projected from the inner peripheral surface, and the crawler body 3. Are provided with a lug group 4 formed in a predetermined lug pattern on the outer peripheral surface thereof, and a tensile body 5 embedded in the crawler body 3 along the circumferential direction of the crawler.

The crawler main body 3 is formed in an endless belt shape having a substantially constant thickness by an elastic body made of rubber, and the drive protrusion 2 projecting from the inner peripheral surface of the crawler main body 3 is formed of an elastic body made of the same material as the crawler main body 3 with short fibers And is arranged at the center in the width direction of the crawler body 3. Further, the drive protrusion 2 has a substantially quadrangular pyramid shape where a / b ≧ 0.7, where a is the crawler width direction base end dimension of the drive protrusion 2 and b is the crawler circumferential direction base end dimension. Is formed.
On the drive sprocket 101 of the crawler traveling device 100, a pair of rotationally driven disks are arranged opposite to each other in the left-right direction, and left and right drive pins are spaced circumferentially between the disks. The elastic crawler 1 is driven along the circumferential direction by engaging a drive pin with the drive protrusion 2 (not shown).

  The wheel 103 and the idler 102 provided in the crawler traveling device 100 have a pair of left and right circular wheel portions and are of a straddle type that passes over the drive protrusion 2 and is an inner peripheral surface of the crawler body 3. The rolling surfaces of the wheel 103 or the idler 102 are formed on the left and right sides of the driving protrusion 2 in the crawler width direction. The elastic crawler 1 is driven in the crawler circumferential direction while the positional deviation in the crawler width direction with respect to the wheel 103 and the idler 102 is regulated.

  The tensile body 5 is formed by arranging a number of tensile cords made of steel cords or the like extending along the crawler circumferential direction and hardening these around with unvulcanized rubber. As the tensile body 5 of the present embodiment, a cord wrap system configured by arranging a plurality of end-tensioned tensile cords wound in the crawler circumferential direction in parallel in the crawler width direction. However, a seamless spiral structure formed by winding a single tensile strength cord in a spiral shape may be used. In addition, as the tensile strength cord, for example, a steel cord, a nylon cord, or the like obtained by combining several steel filaments from several bundles is used.

  As shown in FIGS. 1 and 3, a reinforcing plate 6 is provided on the surface layer of the driving protrusion 2 extending from the top 2 c of the driving protrusion 2 to both sides 2 s in the crawler width direction. The reinforcing plate 6 is formed in a substantially U-shaped cross section in the crawler width direction by bending a metal plate. Further, the reinforcing plate 6 is provided with a bent piece 7 as a drop-off preventing portion formed by bending an end portion of the reinforcing plate 6 in order to prevent the drive plate 2 from dropping off. The bent piece 7 penetrates into the drive protrusion 2 from the reinforcing plate 6, thereby suppressing the displacement of the reinforcing plate 6. The bent piece 7 may be formed by joining another plate material to the end of the reinforcing plate 6.

  The top surface 2c and the crawler width direction side surface 2s of the driving projection 2 and the surface of the reinforcing plate 6 are flush with each other, and the reinforcing plate 6 is located on the surface layer of the driving projection 2. In this way, by placing the reinforcing plate 6 on the surface of the driving protrusion 2 rather than placing it on the surface of the driving protrusion, there is no level difference on the surface of the driving protrusion 2, and the driving pins of the rollers 103 and the driving sprocket 101 can be moved. The reinforcing plate 6 is not caught and the falling off of the reinforcing plate 6 can be prevented and the drive pins can be engaged smoothly. Further, the crawler circumferential width of the reinforcing plate 6 is smaller than the circumferential width of the driving protrusion 2 so that the driving sprocket 101 and the reinforcing plate 6 do not interfere with each other. A corner portion 6m corresponding to the tip corner of the drive protrusion 2 in the reinforcing plate 6 is formed in a curved shape along the corner. Further, both ends of the reinforcing plate 6 in the crawler width direction are located closer to the distal end side of the drive protrusion than the base end portion of the drive protrusion 2. Thereby, when the crawler main body 3 is deformed, the inner peripheral surface of the crawler main body 3 is not damaged at the edge of the reinforcing plate 6, and the molding die for forming the elastic crawler 1 is easily detached. If both ends of the reinforcing plate 6 in the crawler width direction extend to the base end portion of the drive protrusion 2, the molding die is difficult to bite and is difficult to come off, and the molding workability deteriorates.

  According to the elastic crawler 1 of the present embodiment, since the reinforcing plate 6 is provided on the surface layer of the driving projection 2 extending from the top portion 2c of the driving projection 2 to both side portions 2s in the crawler width direction, the top portion of the driving projection 2 is provided. 2c is reinforced by the reinforcing plate 6, and the rigidity of the entire driving protrusion 2 including the reinforcing plate 6 is increased, and even when the elastic crawler 1 is twisted, the top 2c is pushed and deformed by the roller wheel 103. This prevents the wheel from coming off. Even if the elastic crawler 1 is twisted many times, the dropout prevention part 7 prevents the reinforcing plate 6 from falling off, so that the drive protrusion 2 is not damaged and has high durability. Sex can be obtained.

  Further, since the bent piece 7 as the drop-off preventing portion has entered the drive protrusion 2, the displacement of the reinforcing plate 6 can be suppressed even if the rolling wheel 103 comes into contact with the drive protrusion 2, so that the reinforcement plate 6 can be reinforced. It is possible to reliably prevent the plate 6 from falling off. Further, since the corner portion 6m of the reinforcing plate 6 is formed in a curved shape, the adhesion area between the reinforcing plate 6 and the drive projection 2 is increased, and the adhesion of the reinforcing plate 6 is improved. At the same time, the reinforcing plate 6 is bent suddenly. The strength of the reinforcing plate 6 is improved as compared with the case of the above. Furthermore, even if the rolling wheel 103 tries to ride on the drive protrusion 2, it can easily return to the original position along the curved surface, and the effect of preventing the wheel removal can be improved.

Hereinafter, modifications of the reinforcing plate will be described with reference to FIGS.
FIG. 4 shows a first modification of the reinforcing plate. The drop-off preventing portion of the reinforcing plate 15 is composed of a bent piece 16 that invades inwardly at both ends of the crawler width direction. The bent piece 16 has a greater degree of penetration into the drive protrusion 2 than the bent piece 7 of the reinforcing plate 6 of the above-described embodiment, so that the drop prevention effect is improved.

  FIG. 5 shows a second modification of the reinforcing plate. The drop-off prevention portion of the reinforcing plate 20 includes a first bent piece 21 at both ends of the crawler width direction and a second bent piece 22 at the middle portion of the crawler width direction. The reinforcing plate 20 is more effectively prevented from dropping by the second bent piece 22 than the reinforcing plate 6 of the above embodiment.

  FIG. 6 shows a third modification of the reinforcing plate. The drop-off prevention part of the reinforcing plate 30 includes a first bent piece 31 at both ends of the crawler width direction and second bent pieces 32 formed at a plurality of locations in the middle part of the crawler width direction, and is formed in a wave shape as a whole. ing. The reinforcing plate 30 having such a configuration is firmly fixed to the driving protrusion 2 and can improve the rigidity of the entire driving protrusion 2 including the reinforcing plate 30 together.

  FIG. 7 shows a fourth modification of the reinforcing plate. The drop-off prevention portion of the reinforcing plate 40 is composed of a bent piece 41 that is tapered at both ends in the crawler width direction, and the reinforcing plate 40 is formed on both side portions thereof together with an elastic body that constitutes the drive protrusion 2. It has a support hole 41 introduced. The support hole 41 suppresses the displacement of the reinforcing plate 40.

  FIG. 8 shows a fifth modification of the reinforcing plate. The drop-off prevention portion of the reinforcing plate 50 includes a reinforcing support plate 52 that is embedded in the driving protrusion 2 and extends between both side portions 51 of the reinforcing plate 50 corresponding to both sides of the driving protrusion 2 in the crawler width direction. The reinforcing support plate 52 has a support plate hole 53 into which an elastic body constituting the drive protrusion 2 is introduced. The reinforcing plate 50 itself is reinforced from the inside by the reinforcing support plate 52 and the rigidity of the entire drive protrusion 2 including the reinforcing plate 50 is remarkably improved, and the shift of the reinforcing plate 6 is suppressed by the support plate hole 53.

  FIG. 9 shows a sixth modification of the reinforcing plate. The drop-off preventing portion of the reinforcing plate 60 is composed of concave portions 61 formed on both edges of the side portions 61 in the crawler circumferential direction, and an elastic body constituting a driving projection is introduced into the concave portion 61, thereby reinforcing Dropping of the plate 60 is prevented.

  FIG. 10 shows a seventh modification of the reinforcing plate. The reinforcing plate 70 has the same shape as the reinforcing plate 60 of the fifth modified example, and the entirety thereof is embedded in the surface layer of the drive protrusion 2. In this case, the entire reinforcing plate 70 is covered with the elastic body of the drive protrusion 2, and the reinforcing plate 70 can be reliably prevented from falling off.

  FIG. 11 shows an eighth modification of the reinforcing plate. The reinforcing plate 80 is formed in a cross shape from a side plate 81 extending from the top portion 2c of the driving protrusion 2 to both side portions 2s in the crawler width direction and a front and rear plate 82 extending from the front and rear portions 2z in the crawler circumferential direction. Further, the drop-off prevention portion includes a protrusion 81 that enters the drive protrusion 2 from both corners of the crawler circumferential direction and the width direction end of the reinforcing plate 80. By using such a reinforcing plate 80, the rigidity of the drive protrusion 2 is improved, and at the same time, the drive force is transmitted from the drive sprocket 101 to the crawler body 3 without loss.

  The present invention is not limited to the above embodiment. For example, the shape, location, number of holes and recesses provided in the reinforcing plate may be changed, and the dimensions of the reinforcing plate may be changed. Further, a fiber reinforcing layer formed by arranging a large number of fibers in the bias direction may be embedded on the inner peripheral surface side or the outer peripheral surface side of the tensile body embedded in the crawler body. Further, in each of the above embodiments in which the reinforcing plate is positioned on the drive protrusion so that the surface thereof is exposed, rubber of 1 to 2 mm may be attached to the surface of the reinforcing plate.

It is width direction sectional drawing of an elastic crawler. It is a side view of a crawler traveling device. It is a perspective view of the drive protrusion provided with the reinforcement plate. It is a perspective view which shows the 1st modification of the reinforcement plate provided in the drive protrusion. It is a perspective view which shows the 2nd modification of the reinforcement plate provided in the drive protrusion. It is a perspective view which shows the 3rd modification of the reinforcement plate provided in the drive protrusion. It is a perspective view which shows the 4th modification of the reinforcement plate provided in the drive protrusion. It is a perspective view which shows the 5th modification of the reinforcement plate provided in the drive protrusion. It is a perspective view which shows the 6th modification of the reinforcement plate provided in the drive protrusion. It is a perspective view which shows the 7th modification of the reinforcement plate provided in the drive protrusion. It is a perspective view which shows the 8th modification of the reinforcement plate provided in the drive protrusion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Elastic crawler 2 Protrusion part 3 Crawler main body 4 Lug 6 Reinforcement plate 7 Drop-off prevention part

Claims (12)

Drive protrusions arranged at regular intervals in the crawler circumferential direction are crawler bodies made of an endless belt-like rubber elastic body integrally projecting from the inner circumferential surface, and embedded in the crawler circumferential direction along the crawler circumferential direction. In the elastic crawler without a cored bar, through which a plurality of wheels arranged between the drive sprocket and the idler pass on both the left and right sides in the crawler width direction of the drive protrusion,
An elastic crawler, wherein a reinforcing plate having a drop-off preventing portion from the drive protrusion is provided on a surface layer of the drive protrusion extending from the top of the drive protrusion to both sides in the crawler width direction.   The elastic crawler according to claim 1, wherein the drop-off prevention unit is formed of a bent piece that enters the drive protrusion from the reinforcing plate.   The elastic crawler according to claim 2, wherein the bent piece is formed at an end portion or a middle portion of the reinforcing plate in the crawler width direction.   The elastic crawler according to claim 2, wherein the bent pieces are formed at a plurality of locations at predetermined intervals in the crawler width direction of the reinforcing plate.   The elastic crawler according to any one of claims 1 to 4, wherein the reinforcing plate has a support hole into which an elastic body constituting the driving protrusion is introduced.   2. The elastic crawler according to claim 1, wherein the drop-off prevention portion is formed of a concave portion that is formed at an edge in the crawler circumferential direction of the reinforcing plate and into which an elastic body that constitutes the driving protrusion is introduced.   The drop-off prevention portion is formed of a reinforcing support plate that is embedded in the driving projection and extends between both side portions of the reinforcing plate corresponding to both sides of the driving projection in the crawler width direction. The elastic crawler according to claim 1, further comprising a support plate hole into which an elastic body constituting the driving protrusion is introduced. Drive protrusions arranged at regular intervals in the crawler circumferential direction are crawler bodies made of an endless belt-like rubber elastic body integrally projecting from the inner circumferential surface, and embedded in the crawler circumferential direction along the crawler circumferential direction. In the elastic crawler without a cored bar, through which a plurality of wheels arranged between the drive sprocket and the idler pass on both the left and right sides in the crawler width direction of the drive protrusion,
An elastic crawler, wherein a reinforcing plate having a drop-off preventing portion from the drive protrusion is provided on a surface layer of the drive protrusion from the top of the drive protrusion to both sides in the crawler width direction and front and rear portions in the crawler circumferential direction.   The elastic crawler according to any one of claims 1 to 8, wherein a corner portion of the reinforcing plate corresponding to a tip corner of the driving protrusion is formed in a curved shape along the corner.   The elastic crawler according to claim 1, wherein the driving protrusion is made of an elastic body in which short fibers are blended.   The elastic crawler according to any one of claims 1 to 10, wherein the entire reinforcing plate is embedded in a surface layer of the driving protrusion.   The drive protrusion is formed in a substantially quadrangular pyramid shape where a / b ≧ 0.7, where a is the crawler width direction base end dimension of the drive protrusion and b is the crawler circumferential direction base end dimension. The elastic crawler according to any one of claims 1 to 11.

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