JPH0930U - Elastic track - Google Patents

Abstract

(57) Abstract: To provide an elastic crawler belt which can prevent the occurrence of cracks and their extension and can improve durability. SOLUTION: In an elastic crawler belt 11 in which an endless crawler belt body 12 made of an elastic material such as rubber having no cored bar is embedded with a tensile strip body 13 in a circumferential direction, the tensile strip body 13 is the crawler belt. The crawler belt main body 12 is embedded in at least the widthwise central portion of the main body 12, and inner peripheral surfaces on both sides of the crawler belt main body 12 through the widthwise central portion are contact surfaces of the rolling wheels. In the inside, a fiber layer 14 is embedded on the inner peripheral side of the tensile band body 13 at the widthwise central portion, and the widthwise outer end of the fiber layer 14 extends below the contact portion of the rolling wheel. Has been done.

Description

[Detailed description of the device]

[0001]

[Technical field to which the invention belongs]

 TECHNICAL FIELD The present invention relates to an endless elastic crawler track used for an endless track vehicle such as an agricultural mobile machine, various transport vehicles, and snow vehicles.

[0002]

[Prior art]

 Conventionally, an endless track device exemplified in FIG. 9 has been adopted for an agricultural mobile machine (see Japanese Patent Publication No. 49-29654). That is, this device is mainly composed of a drive wheel 1, an idle wheel 2, a rolling wheel 3, and an endless elastic crawler belt 4 wound around these, and the drive wheel 1 includes a drive pin 5. The sprocket 1A shown in FIG. 11 is generally used. Further, as the rolling wheels 3, the sliding rolling wheels 3A illustrated in FIG. 10 are used.

As shown in FIGS. 10 to 11, the conventional elastic crawler belt 4 is entirely made of an elastic material such as rubber, and has a lug 6 on the outer circumference (ground) side and an inner circumference (anti-ground) side. Tensile strips such as steel cords 8 are embedded in the circumferential direction in a crawler belt main body 4A having projections 7 engaging with the drive wheels 1 projecting at predetermined intervals in the circumferential direction and having no core metal. .

[0004]

[Problems to be solved by the device]

 By the way, the conventional elastic crawler belt 4 is driven and rotationally guided by the drive wheel 1, the idler wheel 2 and the straddle rolling wheel 3A. different. Therefore, since the portion that receives the tension is also different, as shown in FIG. 11, a crack 9 occurs between the base of the protrusion 7 of the elastic crawler belt 4, that is, between the outer peripheral side of the steel cord 8 and the wing portion 4B, and the derailing However, there is a problem that this may cause damage or impair durability. Further, since the wing portion 4B of the elastic crawler belt 4 and the portion where the steel cord 8 is embedded have a difference in circumferential extension, the stress caused thereby promotes the generation of the crack 9 and its extension.

The present invention has been made in view of the above situation, and an object of the present invention is to provide an elastic crawler belt capable of preventing the occurrence of cracks and the extension thereof and improving the durability. is there.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention takes the following technical means. That is, the present invention provides an elastic crawler belt in which a tensile band body is circumferentially embedded in an endless crawler belt body made of an elastic material such as rubber having no core metal, wherein the tensile band body is the main body of the crawler belt. Of the crawler belt main body, the inner peripheral surfaces on both sides of the crawler belt main body through the widthwise central portion are contact surfaces of the rolling wheels, and are embedded in the crawler belt main body. The fiber layer is embedded on the inner peripheral side of the tensile strip at the widthwise central portion, and the widthwise outer end of the fiber layer extends to below the contact portion of the rolling wheel. It is a characteristic elastic track.

According to the present invention, the load acting on the abutment portion of the rolling wheel is transmitted to the tensile strip body at the widthwise central portion by the fiber layer, so that the widthwise central portion of the crawler belt and the abutment portion are contacted. The stress concentration due to the difference in tension and elongation is relieved, and the occurrence of cracks and their extension are effectively prevented.

[0008]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a first embodiment of the present invention, in which 11 is an elastic crawler belt, which is an endless crawler belt main body 12 made of an elastic material such as rubber having no core metal, and a circumferential direction in the main body 12. It is composed of a tensile band member 13 such as an embedded steel cord and a fiber layer 14 such as a canvas.

The crawler belt main body 12 is provided with a lug 15 on the outer peripheral side (ground contact side) and a projection 16 engaging with the drive wheel 1 on the inner peripheral side (anti-ground contact side) at predetermined circumferential intervals. The idler wheel 2 and the rolling wheel 3 come into contact with the inner peripheral surface of the blade portion 12A formed at both ends of the protrusion 16 in the width direction. A tensile strip 13 such as a steel cord is circumferentially embedded in the base of the protrusion 16 at the center of the crawler belt 12 in the width direction.

The canvas 14 is embedded in the crawler belt body 12 so that an end portion 14A extends from the inner peripheral side of the tensile band body 13 to both outer sides thereof to both wing portions 12A on the outer peripheral side. The portion 14A is located closer to the outer peripheral side than the outer peripheral end of the tensile strip body 13 with a space S therebetween. The canvas end portion 14A extends so that the canvas 14 is embedded over the entire portion of the wing portions 12A where the idler wheel 2 and the rolling wheel 3 contact each other, and the canvas end portion 14A extends in the circumferential direction of each wheel 2, 3 contacting portion. The elongation is smaller than both outer ends of the wing portion 12A, and the difference in elongation with respect to the embedded portion of the tensile strip 13 is also small. Therefore, stress due to the difference in elongation is small and stress concentration is relieved.

Therefore, in the first embodiment, when the elastic crawler belt 11 is wound around the driving wheel 1, the idler wheel 2 and the rolling wheel 3 and driven to travel, the contact portions of the respective driving wheels 1 to 3 are different, and thus the crawler belt. The tension applied to the main body 12 is different, and the stress tends to concentrate between the wing portion 12A and the protrusion 16, especially at the base of the protrusion 16. However, the difference in tension is reduced by the canvas 14, the stress concentration is relaxed, and cracks are not generated. To be prevented. Even if cracks are caused by the stress due to the difference in the circumferential extension between the wing portion 12A and the embedded portion of the tensile strip body 13, the cracks stop at the canvas 14 and do not extend any further. It doesn't end up damaging the sex.

FIG. 4 shows a second embodiment of the present invention, which is different from the first embodiment in that the canvas 14 is embedded in two plies, that is, in two layers. Are the same as those in the first embodiment, the same reference numerals are given and the description is omitted. FIG. 5 shows a third embodiment of the present invention. The difference from the first embodiment is that the canvas 14 is separated on the inner peripheral side of the tensile strip body 13 and each inner end portion 14B thereof is It is located on the inner circumferential side of both ends of the tensile band 13 in the width direction, and is otherwise the same as that of the first embodiment, and therefore, the same reference numerals are given and description thereof is omitted. In the third embodiment, it is possible to further reduce the difference in circumferential extension between the embedded portion of the tensile strip body 13 and the end of the wing portion 12A. Also in the third embodiment, the canvas 14 may have two layers or three layers, respectively.

FIG. 6 shows a fourth embodiment of the present invention. Tensile strips 13 such as steel cords are embedded in the crawler belt body 12 in three rows in the width direction thereof, and the canvas 14 is wide. It extends from the inner peripheral side of the tensile strip body 13 at the center in the direction to the inner peripheral side of the tensile strip body 13 of the wing portion 12A, passing between the tensile strip bodies 13 on both sides. Therefore, the canvas 14 is located in the three rows of the tensile strips 13 and is reinforced by the canvas 14 to relax the stress concentration.

FIG. 7 shows a fifth embodiment of the present invention. The difference from the first embodiment is that the tension band bodies 13 are embedded in the crawler belt body 12 in two rows in the width direction. The difference is that the projections 16 are provided in two rows in the width direction, and the canvas 14 extends from the inner peripheral side to the outer peripheral side of the two rows of the tensile strips 13, which is equivalent to that of the first embodiment. You can expect an effect. FIG. 8 shows a sixth embodiment of the present invention, in which a two-ply canvas 14 is embedded in the crawler belt body 12, and the canvas 14 on the inner peripheral side is embedded in the same manner as in the first embodiment. However, the canvas 14 on the outer peripheral side is embedded in the outer peripheral side of the tensile strip body 13, and both end portions 14C thereof are located closer to the center side than the end portion 14A of the inner peripheral side canvas 14, and the step 17 Is attached. Therefore, the difference in circumferential extension between the embedded portion of the tension band body 13 of the crawler belt body 12 and the wing portion 12A is gradually reduced, and the occurrence of cracks can be effectively prevented.

In the present invention, in the fiber layer 14 such as the canvas, the difference in circumferential extension between the embedded portion of the tensile strip 13 and the wing portion 12A can be minimized, and stress concentration due to the difference in extension can be avoided. It is preferable to embed it as much as possible, and it is natural that a plurality of fiber layers having different widths may be provided. In particular, care should be taken to reduce the stress due to the tension concentrated on the base of the protrusion 16. Is.

[0016]

[Effect of the invention]

 According to the present invention, the load acting on the contact portion of the rolling wheel is transmitted by the fiber layer to the tensile band body at the center portion in the width direction. And stress concentration due to the difference in elongation are alleviated, and the occurrence of cracks and their extension are effectively prevented.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of the present invention.

FIG. 2 is a partial plan view showing the first embodiment of the present invention.

FIG. 3 is a side view showing the first embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view showing a second embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view showing a third embodiment of the present invention.

FIG. 6 is a vertical sectional view showing a fourth embodiment of the present invention.

FIG. 7 is a vertical cross-sectional view showing a fifth embodiment of the present invention.

FIG. 8 is a vertical sectional view showing a sixth embodiment of the present invention.

FIG. 9 is a conventional arrangement example and is a layout view of a relationship between a crawler belt and each driving wheel.

FIG. 10 is a layout view showing the relationship between the rolling wheels and the crawler belt according to the conventional example.

FIG. 11 is a diagram illustrating engagement between a drive wheel and a crawler belt according to a conventional example.

[Explanation of symbols]

 11 Elastic Crawler 12 Crawler Track Main Body 13 Tensile Belt 14 Fiber Layer

Claims (1)

[Utility model registration claims] 1. An elastic crawler belt (11) in which a tensile band body (13) is circumferentially embedded in an endless crawler belt body (12) made of an elastic material such as rubber having no core metal. The band body (13) is embedded in at least the center portion in the width direction of the crawler belt body (12), and the inner peripheral surfaces on both sides of the crawler belt body (12) through the center portion in the width direction are rolled. A fiber layer (14) is embedded in the crawler belt main body (12) on the inner peripheral side of the tensile band body (13) in the widthwise central portion of the fiber layer (14). ), The outer end in the width direction is extended to below the contact portion of the rolling wheel.