JP3081313B2 - Rubber Crawler Unit Structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Rubber crawler has been widely used as a traveling device for agricultural machines, and has recently been used as a traveling device for construction machines and civil engineering machines. Such a rubber crawler has a configuration in which a large number of metal cores are buried side by side in an endless rubber elastic body, and a steel cord is buried as a tensile body by surrounding the core metal. ing. The characteristic of the rubber crawler is that unlike the iron crawler used for construction machinery,
It has a great advantage in that it reduces vibrations on the tar and does not damage it even when traveling on pavement roads, etc., and has been widely used in place of iron scrolls. .

[0003] However, the rubber crawler is not without its drawbacks, and is composed entirely of rubber.
For example, sharp ore in a quarry can damage rubber, which may cause the core metal buried in the rubber to fall off or water entering the rubber from cracks in the rubber. Even if there is a partial defect such as rusting of steel code, rubber
A situation arises in which the entire machine must be replaced.

An object of the present invention is to solve the above-mentioned drawbacks of rubber rollers. Instead of using an endless rubber roller from the beginning, a rubber roller unitized to a unit length is used. To provide.

[0005]

A typical example of a rubber roller unitized for the above-mentioned purpose is Japanese Utility Model Publication No. Sho 56-108985. FIG. 1 is an overall side cross-sectional view, and FIG. 2 is a partial side cross-sectional view when this is connected endlessly. As can be seen from the drawing, this conventional rubber crawler unit has mounting plates A and B serving as substitutes for a core metal at both ends embedded in rubber, and a steel code C attached thereto. The unit is connected to the mounting plates A and B with bolts D and nuts E to form an endless unit. However, in the steel code C to which a large tension is applied, the connecting portion is inevitably connected with a step W up and down as shown in the figure.

Accordingly, when the rubber crawler is supplied to the traveling device and a large force is applied to the steel cord C, the steel cord C tends to be straight, so that the mounting plate A at the connecting portion is formed. , B rotate counterclockwise as indicated by arrow X. That is, in the vicinity of the mounting plates A and B, the steel cord C is always repeatedly bent by the step W, and from this point the steel cord C is bent.
This leads to disconnection of C.

Further, steel code C to which a large tension is applied
In this case, the steel cord C may come off because the tip is merely embedded in the rubber along with the mounting plates A and B.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rubber crawler unit in which a steel cord is prevented from being bent and its tip is not exposed.

[0009]

Means for Solving the Problems The present inventor has conducted intensive studies to solve the above problems, and as a result, has solved the problems by adopting the following configuration. That is, the gist of the present invention is to provide a core rubber which is arranged side by side at predetermined intervals in a longitudinal direction in a band-shaped rubber elastic body having a unit length, and is disposed on the outer peripheral side of the core metal over the entire length of the band-shaped rubber elastic body. In the rubber crawler unit having the steel code row embedded therein, a connecting member consisting of two opposing portions and a hairpin portion connecting the two opposing portions is connected to a rubber elastic body by projecting the hairpin portions at both ends of the unit. The steel cord row is inserted between the opposed parts, and the opposed part and the steel cord row are bonded and integrated with an adhesive by an adhesive. This is the structure of the LA unit.

[0010] Generally, the opposing portion of the connecting metal fitting is located directly below the core metal, and the hairpin portions of the two buried connecting metal fittings cannot be fitted to each other. The present invention provides a rubber crawler unit structure in which a connecting pin can be inserted from the width direction of the rubber crawler unit.

In the present invention, first, a connecting metal fitting with which a hairpin portion is fitted to each other is used, and a steel cord row end is inserted between opposed portions of the connecting metal fitting, and for example, an epoxy adhesive is used. The two are bonded and integrated, and a steel cord row with connecting metal fittings attached to both ends thereof is set in a mold together with unvulcanized rubber, and then heated to form a rubber crawler unit. Is what is done. The adhesive may be, for example, a vulcanized adhesive.

It is desirable that the opposing portion of the connecting fitting buried in the rubber elastic body is located immediately below the core metal, that is, on the outer peripheral side of the core metal. Even in some cases, the impact of the engagement is not directly received on the bonding portion. It should be noted that, particularly, the facing portions of the connecting fittings may not be parallel, and in some cases, it is preferable that the facing portions be slightly opposed to the tip of the steel cord row. In some cases, it is also a good method to divide the opposing portion of the connecting fitting and the hairpin portion.

[0013]

The present invention is a rubber roller unit as described above.
The rows are arranged on one plane as a whole. Therefore, even if a large tension is applied to the steel cord row, the connecting metal does not rotate, and accordingly the steel cord is not rotated.
The bending of the record does not occur. And, since the gap between the facing portion of the connecting fitting and the end of the steel cord row is bonded and integrated with an adhesive, there is no danger of the cord escaping and the durability as a rubber crawler is improved. Since this is a unit, it has an excellent function that, in the unlikely event that only a damaged unit can be replaced, it can be replaced.

Further, when the rubber crawler unit is connected and used as a traveling part, tension is applied to the steel cord. However, the elasticity of the adhesive (for example, epoxy adhesive) is higher than that of the connecting fitting. Since it is slightly lower, the force is shared by the entire length of the steel cord inserted and bonded in the opposing portion, and hence the concentration of the force is avoided, so that the fatigue of the steel cord row is reduced. Will be done.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 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, reference numeral 10 denotes a connecting bracket,
Reference numerals 1 and 12 denote opposing portions, each having a hairpin portion 13 at the center. The hairpin 13 has a cutout 14 so that the hairpin 13 can fit each other. Then, a connecting pin (not shown) is inserted into the hairpin portion 13. In this example, the opposing portions 11 and 12 are parallel, and a steel coil is provided between the parallel portions 11 and 12.
The end of the row 15 is inserted, and the gap is filled with an epoxy-based adhesive 16 to be bonded and integrated.

When a tension is applied to the steel cord row 15, this force is shared by the entire length inserted between the opposed portions 11 and 12, but the diameter D _{0 of} the steel cord 15 and The ratio L ₀ / D ₀ to the insertion length L ₀ into the facing portions 11 and 12 is about 10 which is sufficient in terms of strength, and it is particularly desirable that this ratio be 15 or more in consideration of fatigue.

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

FIG. 5 is a plan view of an outer peripheral side of the rubber roller unit of the present invention, and FIG. 6 is a partially cutaway side view thereof.
In FIG. 6, the left side is a 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 connection fitting in FIG. FIG. 7 is a partial cross-sectional view in the width direction in the vicinity of the connection fitting in FIG.

In this figure, reference numeral 17 denotes a rubber elastic body, in which a metal core 18 is buried side by side at a constant pitch. Reference numeral 19 denotes a corner portion extending from the cored bar 18, which has a function of preventing a track roller, a sprocket or the like from coming off. Then, as can be seen from the figure, the opposing portions 11 and 12 of the connection fitting 10 are provided with cores 18 located at both ends.
It is located directly below. By arranging in this manner, when a sprocket (not shown) is in the sprocket hole 20 and meshes with the cored bar 18, the sprocket does not directly collide with the connection fitting 10, leading to an increase in durability. In the figure,
21 is a rubber lug.

In the rubber roller unit, the rubber rollers are sequentially connected to form an endless rubber roller. The left and right connecting metal fittings 10 ₁ and 10 ₂ are fitted to each other, and a connecting pin (not shown) is connected to the hairpin portion 13. 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 bracket 10 and a steel cord row 1.
5 is another example showing the relationship with the counterpart 1 in this case.
Reference numerals 1 and 12 are examples in which the distal end side of the steel code row 15 is slightly narrowed, in other words, examples in which the distal end sides of the opposing portions 11 and 12 are expanded. Also, FIG.
An example in which 1, 12 are expanded from the middle is shown.

When the opposing parts 11 and 12 are parallel as shown in FIG. 4, when a tension is applied to the steel cord row 15, a greater load is to be applied as the steel cord row 15 comes closer to the tip of the opposing parts 11 and 12. On the other hand, as shown in FIGS. 8 and 9, by expanding the ends of the opposing portions 11 and 12, the load burden is more dispersed, which leads to an improvement in durability.

FIG. 10 is a side view showing the relationship between the connecting fittings and the steel cord row showing an example in which the functions of the connecting fittings are differentiated, and FIG. 11 is a plan view thereof. This is a structure in which a metal fitting is divided into a function of bonding and integrating a connecting metal with a steel code row and a connecting function of connecting the units as shown in the figure. And a hairpin portion are separated from each other. Connection fitting 30
Is composed of two long plate members 31 and 32, between which the distal end of the steel cord row 15 is sandwiched and integrated with an adhesive. On the other hand, a claw portion 34 is formed on the separated hairpin portion 33, and the claw portion 34 is elastically sandwiched between the plate members 31 and 32,
The connection fitting 30 is configured.

As described above, since the plate members 31 and 32 with respect to the opposed portion of the connecting fitting 30, that is, the steel cord row 15 are completely separated, the pretreatment for applying the adhesive becomes very simple and reliable. The surface treatment of the plate bodies 31 and 32 by shot blasting can be easily performed,
Further, since the two plate members 31 and 32 are simply bonded together, the adhesive can be surely applied to the surfaces of the plate members 31 and 32.

Further, since the hairpin portion 33 sandwiches the plate members 31 and 32 between the claw portions 34, the hairpin portion 33 can slide in the longitudinal direction of the plate members 31 and 32, and thus the size of the rubber crawler can be increased. Hairpin 3
3 can be freely changed.

[0026]

As described above, according to the present invention, the rubber crawler is unitized, and its steel cord rows are arranged at the same horizontal position on the right and left sides of the connecting bracket, so that the tension is uniformly applied to the steel crawler. Since the bending and tearing of the cord is eliminated, and the connecting bracket and the ends of the steel cord are integrally bonded with an adhesive, the steel cord does not come off, and the rubber crawler does not come off. In this case, only the unit in the damaged portion needs to be replaced, and a rubber crawler having a long durability and a long life can be provided as a whole.

[Brief description of the drawings]

FIG. 1 is an overall side sectional view of a rubber crawler unit according to the prior art.

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

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

FIG. 4 is a side view showing a positional relationship between the connecting fitting shown in FIG. 3 and a steel cord row.

FIG. 5 is a plan view of an outer peripheral side of the rubber roller 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 sectional view between sprocket holes 20 in FIG. 5; FIG. 5 is a cross-sectional view of the vicinity of a connection fitting in FIG.

FIG. 7 is a partial cross-sectional view in the width direction of the vicinity of a connection fitting of the rubber crawler unit in FIG. 5;

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

FIG. 9 is a diagram showing still another example of a connecting bracket and a stud according to the present invention.
FIG. 5 is a side view similar to FIG. 4 showing a relationship with a row of records.

FIG. 10 is a side view showing the relationship between the connecting fittings and the steel cord 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 connection fitting of FIG. 10 and a steel cord row.

[Explanation of symbols]

10, 10 ₁ , 10 ₂ , 30 ° connecting bracket, 11, 12, 31, 32 ° facing portion (plate), 13, 33 ° hairpin portion, 14 ° notched portion, 15 ° steel Row, 16 、 adhesive, 17 ‥‥ rubber elastic body, 18 ‥‥ core bar, 19 ‥‥ corner, 20 ‥‥ sprocket hole, 21 ‥‥ rubber lug, 34 ‥‥ nail.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-64-1666 (JP, A) JP-A-62-289479 (JP, A) Fully open 1980-108985 (JP, U) Really open 1954 8246 (JP, U) JP-A 4-56591 (JP, U) Jikken 46-33943 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B62D 55/253 B62D 55 / 32

Claims (3)

(57) [Claims] 1. A metal core which is arranged side by side at predetermined intervals in a longitudinal direction in a rubber elastic body having a unit length, and a steel member is arranged on the outer peripheral side of the metal core over the entire length of the rubber elastic body. -In a rubber crawler unit in which a row of records is buried, a connecting fitting consisting of two opposing parts and a hairpin part connecting the two parts is buried in a rubber elastic body with the hairpin parts protruding at both ends of the unit. The steel cord row is inserted between the opposed parts, and the opposed part and the steel cord row are bonded and integrated with an adhesive. Construction. 2. The rubber crawler unit structure according to claim 1, wherein the opposing portion of the connection fitting is located immediately below the metal core. 3. The hairpin portion of two buried connecting fittings can be fitted to each other, and the connecting pin can be inserted into the inside of the hairpin from the width direction of the rubber crawler unit. Structure of rubber crawler unit.