JPH05112267A - Structure of rubber crawler unit - Google Patents

Abstract

PURPOSE:To prevent bending of the steel cord of a rubber crawler unit and to prevent pulling off of a tip. CONSTITUTION:In a rubber crawler unit wherein cores 18 laterally arranged at intervals of a specified distance in a longitudinal direction and a steel cord train 15 arranged on the outer peripheral sides of the cores throughout the overall length of a belt-like rubber resilient body are embedded in a belt-like rubber resilient body 17 having a unit length, a coupling metal comprising two opposite parts and a hair pin part 13 for intercoupling the two opposite parts is embedded in the two end parts of the unit in a state that hair pin parts are protruded. The steel cord train is inserted between opposite parts 11 and 12, and the opposite part and the steel cord train are integrally adhered together between opposite parts 11 and 12 and the opposite parts and the steel cord train are integrally adhered together by means of an adhesive. Since the steel cord train is arranged in the same horizontal position on the right and left of a coupling metal, this constitution can provide a rubber crawler which receives only an uniform tension, can prevent bending breakage of the steel cord, can be prevented from the occurrence of pulling off, may do well by exchanging only a unit having a breakage part, and processes durability and an increased life time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a rubber crawler, and more particularly to the structure of a rubber crawler unit having a unit length.

[0002]

2. Description of the Related Art A rubber crawler has been widely used as a traveling device for agricultural machines for a long time, and in recent years, it has also been used as a traveling device for construction machines and civil engineering work machines. Such a rubber crawler has a structure in which a large number of cored bars are arranged side by side in an endless rubber elastic body, and the cored bar is surrounded as a tensile body so that a steel code is embedded in the rubber. ing. And, the characteristic of the rubber crawler differs from the iron shoe crawler used in construction machinery etc.
It has a great advantage that it reduces vibrations to the vehicle and does not damage it even when traveling on a paved road surface, etc., and has been widely adopted in place of the iron scroller. ..

However, the rubber crawler is not without its drawbacks, and because it is entirely composed of rubber,
For example, ore with a sharp tip in a quarry may damage rubber, which may cause the core metal embedded in the rubber to fall off or moisture that has entered the rubber from the cracked portion of the rubber. Due to this, even if there are partial defects such as rust on the steel cord, the rubber black
A situation occurs in which the entire La must be replaced.

The present invention is intended to eliminate the above-mentioned drawbacks of the rubber crawlers, and instead of making the rubber crawlers endless from the beginning, a rubber crawler unitized into a unit length is used. Is provided.

[0005]

A typical example of a rubber crawler unitized for the above-mentioned purpose is Jiakai 56-108985. FIG. 1 is an overall side sectional view thereof, and FIG. 2 is a partial side sectional view of the endlessly connected body. As can be seen from the figure, in this rubber crawler unit of the prior art, mounting plates A and B, which are substitutes for cored bars, are embedded in rubber at both ends, and a steel code C is attached to this. The units are connected to the mounting plates A and B with bolts D and nuts E to form an endless shape. However, in the steel cord C to which a large amount of tension is applied, the connecting portion is inevitably connected with a step W in the vertical direction as shown in the drawing.

Therefore, when this rubber crawler is used in a traveling device and a large force is applied to the steel cord C, the steel cord C tends to be in a straight line, so that the mounting plate A at this connecting portion is in alignment. , B will rotate in the direction opposite to the clockwise direction indicated by the arrow X. That is, the steel code C near the mounting plates A and B is repeatedly bent by the amount of the step W, and from this point, the steel code is bent.
This leads to the disconnection of C.

[0007] Further, a steel cord C to which a large tension is applied
However, since the tip ends of the mounting plates A and B are only embedded in the rubber, the steel code C may come out.

The object of the present invention is to eliminate the bending of the steel cord and prevent the tip of the rubber cord unit from being bent.

[0009]

As a result of intensive studies to solve the above problems, the present inventor has solved the problems by adopting the following configuration. That is, the gist of the present invention is to arrange a cored bar elastically arranged in the longitudinal direction in a band-shaped rubber elastic body having a unit length, and to arrange the band-shaped rubber elastic body over the entire length on the outer peripheral side of the cored bar. In a rubber crawler unit in which a fixed steel cord row is embedded, a connecting metal member composed of two facing parts and a hairpin part connecting the facing parts is provided with a rubber elastic body by protruding the hairpin parts at both ends of the unit. The rubber cord is embedded in the rubber cord, the steel cord row is inserted between the facing portions, and the facing portion and the steel cord row are bonded and integrated with an adhesive. This is the structure of the la unit.

In general, the facing portion of the connecting fitting is located immediately below the core metal, and the hairpin portions of the two embedded connecting fittings are fitted to each other, and the rubber crawler unit is inside the hairpin. The present invention provides a structure of a rubber crawler unit in which a connecting pin can be inserted from the width direction of the.

In the present invention, first, a connecting metal fitting is used in which the hairpin portions are fitted to each other, and a steel cord row end is inserted between the facing portions of the connecting metal fitting, and, for example, an epoxy adhesive is used. A rubber crawler unit is formed by adhesively integrating the two and setting a steel cord row with connecting metal fittings bonded to both ends in the mold together with unvulcanized rubber and then heating. Is done. Of course, the adhesive may be, for example, a vulcanization type adhesive.

It is desirable that the facing portion of the connecting metal fitting, which is embedded in the rubber elastic body, is located immediately below the core metal, that is, on the outer peripheral side of the core metal. In order to have this structure, the engagement with the sprocket is performed. Even if it happens, the impact of meshing will not be directly applied to the adhesive part. Incidentally, in particular, the facing portions of the connecting fittings do not have to be parallel, and it may be preferable to face the tip of the steel code row with a slight margin. Further, depending on the case, it is also a good method to divide the facing part of the connecting fitting and the hairpin part.

[0013]

Since the present invention is the rubber crawler unit as described above, when the connecting fittings are connected to each other, the steel coll
The rows of rows are arranged on one plane as a whole. Therefore, even if a large amount of tension is applied to the steel cord row, the connecting metal fitting will not rotate, and therefore the steel cord will not rotate.
The bending of the rule will not occur. Further, since the opposing portion of the connecting fitting and the end of the steel cord row are bonded and integrated with an adhesive, there is no danger of the cord coming out, and the durability as a rubber crawler is improved. Since this is a unit, it has an excellent function of being able to replace only the damaged unit in case of emergency.

Further, when the rubber crawler unit is connected and used as a running part, tension is applied to the steel cord, but the adhesive (eg, epoxy adhesive) has an elastic modulus higher than that of the connecting metal fitting. Since it is slightly low, the force is shared by the entire length of the steel cord inserted and bonded in the facing portion, and therefore the concentration of the force is avoided, and the fatigue of the steel cord row is reduced. Will be done.

[0015]

The present invention will be described in more detail with reference to the drawings. FIG. 3 is a perspective view of a connecting fitting used in the present invention, and FIG. 4 is a side view showing a relationship between the connecting fitting and a steel cord row. In the figure, 10 indicates a connecting metal fitting, and 1
Reference numerals 1 and 12 denote facing portions, and have a hairpin portion 13 at the center. The hairpin portion 13 is formed with a cutout portion 14 so that they can be fitted to each other. Then, a connecting pin (not shown) is inserted inside the hairpin portion 13. In this example, the facing portions 11 and 12 are parallel to each other, and the steel coil is placed between the parallel portions 11 and 12.
The end of the row 15 is inserted, and the epoxy adhesive 16 is filled in this gap to integrally bond them.

When tension is applied to the steel cord row 15, this force will be shared by the entire length inserted between the facing portions 11 and 12, and the diameter D _{0 of} the steel cord 15 The ratio L ₀ / D ₀ to the insertion length L ₀ into the facing portions 11 and 12 is about 10 for strength, and this ratio is preferably 15 or more in consideration of fatigue resistance.

In general, the connecting metal fittings 10 are formed in this state in advance on both ends of the steel cord row 15, and are set in a mold for manufacturing a rubber crawler unit.

FIG. 5 is a plan view of the outer peripheral side of the rubber crawler unit of the present invention, and FIG. 6 is a partially cutaway side view thereof.
In FIG. 6, the left side is the side view in FIG.
The center is a cross-sectional view between the sprocket holes 20 in FIG. 5, and the right side is a cross-sectional view near the coupling fitting in FIG. Further, FIG. 7 is a partial cross-sectional view in the width direction in the vicinity of the connecting fitting in FIG.

In the figure, reference numeral 17 is a rubber elastic body, in which a cored bar 18 is embedded side by side with a constant pitch. Reference numeral 19 is a corner extending from the cored bar 18, which has a function of preventing a track roller, a sprocket or the like from coming off. As shown in the figure, the facing parts 11 and 12 of the connecting fitting 10 are provided with cored bars 18 located at both ends.
It is located directly below. By arranging in this way, when the sprocket (not shown) is in the sprocket hole 20 and meshes with the cored bar 18, it does not directly collide with the connecting metal fitting 10 and the durability is improved. In the figure,
21 is a rubber rug.

In such a rubber crawler unit, the rubber crawlers are connected in sequence to form an endless rubber crawler. The left and right end fittings 10 ₁ and 10 ₂ are fitted together, and a connecting pin (not shown) is attached to the hairpin portion 13. It is inserted into the inside to form an endless rubber crawler. In this case, the steel code rows 15 are arranged on the same plane as a whole.

FIG. 8 shows a connecting fitting 10 and a steel cord row 1.
5 is another example showing the relationship with No. 5, in this case, the facing portion 1
Nos. 1 and 12 are examples in which the tip ends of the steel cord rows 15 are slightly narrowed, in other words, the tip ends of the facing portions 11 and 12 are widened. Further, FIG. 9 shows the facing portion 1
An example in which 1 and 12 are expanded from the middle is shown.

When the facing portions 11 and 12 are parallel to each other as shown in FIG. 4, when a tension is applied to the steel code row 15, the closer the tips of the facing portions 11 and 12 are, the more load is to be applied. On the other hand, if the tips of the facing portions 11 and 12 are opened and spread as shown in FIGS. 8 to 9, the load burden is further dispersed, which leads to improvement in durability.

FIG. 10 is a side view showing the relationship between the connecting fittings and the steel code row showing an example in which the function of the connecting fittings is differentiated, and FIG. 11 is a plan view thereof. As shown in the figure, this is a structure in which the metal fittings are divided into a function of adhering the connecting metal fittings to the steel cord row and a function of connecting the units to each other. The hairpin part and the facing part sandwiching the pin are separated. Connection fitting 30
The opposing portion in 2 is composed of two long plate members 31 and 32, and the tip of the steel code row 15 is sandwiched between them to be integrated with an adhesive. On the other hand, a claw portion 34 is formed on the separated hairpin portion 33, and the plate body 31, 32 is sandwiched by the claw portion 34 to be elastically attached,
The connecting fitting 30 is configured.

In this manner, since the facing portions of the connecting fitting 30, that is, the plates 31 and 32 for the steel code row 15 are completely separated, the pretreatment for applying the adhesive becomes extremely simple and reliable. Surface treatment of the plates 31, 32 by shot blasting can be easily performed,
Further, since the two plates 31, 32 are simply pasted together, the adhesive can be reliably applied to the surfaces of the plates 31, 32.

Further, since the hairpin portion 33 sandwiches the plate members 31 and 32 with the claw portion 34, the hairpin part 33 can slide in the longitudinal direction of the plate members 31 and 32. Therefore, the size of the rubber crawler is large. Hairpin part 3 considering the condition of use and the like
The position of 3 can be freely changed.

[0026]

As described above, according to the present invention, since the rubber crawlers are unitized and the steel cord rows are located at the same horizontal position on the left and right of the connecting metal fittings, the tension is evenly applied and Since the breaking and breaking of the rule cord is eliminated and the connecting metal fitting and the end of the steel cord row are integrally bonded with an adhesive, the steel cord does not come off, and the rubber crawler does not come out. In this case, only the unit of the damaged portion needs to be replaced, and it is possible to provide a rubber crawler having a long durability and a long life as a whole.

[Brief description of drawings]

FIG. 1 is an overall side sectional view of a rubber crawler unit according to a conventional technique.

FIG. 2 is a partial side cross-sectional view when the units shown in FIG. 1 are connected.

FIG. 3 is a perspective view of a connecting fitting used in the present invention.

FIG. 4 is a side view showing the positional relationship between the connecting fitting and the steel code row shown in FIG.

FIG. 5 is a plan view of the outer peripheral side of the rubber crawler unit of the present invention.

6 is a partially cutaway side view of the rubber crawler unit in FIG. 5, the left side is a side view in FIG. 5, the center is a cross-sectional view between the sprocket holes 20 in FIG. 5, and the right side is a view. FIG. 5 is a cross-sectional view of the vicinity of the connecting metal fitting in FIG.

7 is a partial cross-sectional view in the width direction in the vicinity of a connecting fitting of the rubber crawler unit in FIG.

FIG. 8 is a side view similar to FIG. 4, showing the relationship between a connecting fitting and a steel cord row according to another example of the present invention.

[Fig. 9] Fig. 9 is a still further embodiment of the present invention, a connecting fitting and a steel plate.
FIG. 5 is a side view similar to FIG. 4 showing a relationship with a rucode row.

FIG. 10 is a side view showing the relationship between the connecting fittings and the steel code row showing an example in which the functions of the connecting fittings are differentiated.

FIG. 11 is a plan view showing the relationship between the connecting fitting and the steel code row of FIG.

[Explanation of symbols]

10, 10 ₁ , 10 ₂ , 30 ... Connection fittings, 11, 12, 31, 32 ... Opposing part (plate), 13, 33 ... Hairpin part, 14 ... Notch part, 15 ... Stainless steel -D row, 16 ... Adhesive, 17 ... Rubber elastic body, 18 ... Core metal, 19 ... Corner, 20 ... Sprocket hole, 21 ... Rubber lug, 34 ... Claw.

Claims (3)

[Claims] 1. A band-shaped rubber elastic body having a unit length, and a cored bar laterally arranged at regular intervals in the longitudinal direction, and a stylus arranged on the outer peripheral side of the cored bar over the entire length of the band-shaped rubber elastic body. -In a rubber crawler unit in which a row of cords is embedded, connecting metal fittings composed of two facing portions and a hairpin portion connecting the facing portions are embedded in a rubber elastic body with the hairpin portions protruding at both ends of the unit. However, the steel cord row is inserted between the facing portions, and the facing portion and the steel cord row are bonded and integrated with an adhesive. Construction. 2. The structure of the rubber crawler unit according to claim 1, wherein the facing portion of the connecting fitting is located directly below the cored bar. 3. The hairpin portions of the two embedded connecting fittings are incapable of fitting with each other, and the connecting pin can be inserted into the hairpin from the width direction of the rubber crawler unit. Structure of rubber crawler unit.