JP2003182661A - Structure for rubber crawler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent edge cut in a core-metal-less crawler which does not have a core metal embedded therein. <P>SOLUTION: This rubber crawler 10 is a friction drive type rubber crawler having lugs 3 formed on an outer peripheral side of a long rubber elastic body 1 and guides 2 formed on an inner peripheral side at a fixed interval, and the core body made of steel cord row 4 embedded in a longitudinal direction thereof. A cod member 5 is embedded with having inclination angles to a longitudinal direction corresponding to left and right width edge of a drive wheel or an idler wheel. <P>COPYRIGHT: (C)2003,JPO

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 so-called core bar less crawler in which a core bar is not embedded.

[0002]

2. Description of the Related Art Speaking of a conventional structure of a rubber crawler, there are a structure in which a core is embedded and a structure without a core, and a friction drive type rubber crawler is usually a rubber crawler without a core. Is used. In such a friction drive type rubber crawler, guides are generally formed on the inner peripheral side of the rubber crawler with a constant interval, and the guides are engaged with the drive wheel or used as a disengagement prevention guide,
The mechanism is such that the driving force is transmitted by utilizing the frictional resistance of the inner peripheral surface of the rubber crawler. The steel cord row as a core is endlessly embedded in the longitudinal direction of the rubber crawler.

FIG. 1 shows an example thereof and shows a cross section in the width direction of a rubber crawler. Reference numeral 10 is a friction drive type rubber crawler, and reference numeral 11 is a long rubber elastic body that forms the base of the rubber crawler and has an endless shape across the front and back of the drawing. Reference numeral 12 is a guide made of a rubber elastic body protruding from the inner peripheral surface of the rubber elastic body 11, 13 is a lug formed on the outer peripheral surface side of the rubber elastic body 11, and 14 is embedded along the longitudinal direction of the rubber elastic body 11. It is a core body made of a row of steel cords. Needless to say, a reinforcing cord may be buried in addition to the above.

In the friction driven rubber crawler 10, the core 14 serves as a tensile reinforcing material against the tension applied to the rubber crawler 10.
Ordinarily, it is embedded within the left-right width of an idler wheel (not shown) or even slightly outside thereof. In addition, in the illustrated example, an example is shown in which the wheel is buried slightly outside the width of the wheel.

[0005]

However, in this type of rubber crawler, the rubber crawler portion 11a, which is outside the lateral width of the wheel during rolling, is repeatedly wound outside (grounded side). Furthermore, since the bending due to the load transmitted from the wheel 20 and the rolling wheels during running is repeated (arrow portion a), so-called edge cutting at the rubber crawler end portion (portion indicated by arrow a) occurs.
The present invention provides a rubber crawler for the purpose of preventing such edge cutting.

[0006]

SUMMARY OF THE INVENTION A gist of the present invention is to form a lug on the outer peripheral side of a long rubber elastic body and guides at regular intervals on the inner peripheral side, and to form a core made of a steel cord row in the longitudinal direction. A friction driven rubber crawler having a body embedded therein, characterized in that a cord member is embedded at an inclination angle (including 0 degree) with respect to the longitudinal direction corresponding to the left and right width ends of a drive wheel or an idler wheel. The structure of the rubber crawler specifically relates to the structure of the rubber crawler in which the cord member is embedded from the portion corresponding to the wheel to the outside beyond the left and right width ends thereof.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The rubber crawler of the present invention has the above-mentioned structure, and the embedded cord member is not embedded over the entire area of the rubber crawler but only over the left and right width ends of the wheel. In some cases, a plurality of layers of cord members are embedded in an endless shape. Normally, depending on the size of the rubber crawler, the inner side of the left and right width ends of the wheel 1
From about 5 cm to 1 to 5 cm outside the left and right width ends is embedded. Characteristically, it is desirable to have a limit of 1 to 2 cm for each effect to be exhibited. The relationship between the cord member and the embedded core body is important, and the core body is embedded only in the portion corresponding to the wheel, or it is embedded beyond the left and right width ends to the outside. The members are embedded at the left and right ends of the core body so as to overlap each other. This overlap area is about 1 to 5 cm. As for the relationship with the core body, the core body may be located on the inner peripheral side of the left and right ends or on the outer peripheral side. Of course, in some cases, the cord members may be embedded on both inner and outer circumferences. As for the cord member, a synthetic fiber cord such as nylon or tetron or a metal fiber cord is used.

In the rubber crawler of the present invention, the rigidity of the so-called ears is increased to suppress the occurrence of ear cuts, and the tendency for the ears to be caught during running is repeated, and the strain is concentrated at this part. Even in this case, since the cord member corresponding to the bent portion of the rubber is embedded, the concentration of strain applied to the rubber is relieved, and the occurrence of ear-cutting is prevented. The embedding of the cord member does not need to be performed over the entire area of the rubber crawler, but it is sufficient if it is embedded only in the bent portion. When the rubber crawler is buried over the entire area, the winding resistance of the entire rubber crawler increases, which leads to energy loss, but the present invention has a feature that such a defect is not observed. is there.

It is preferable that the cord member to be buried overlaps the core body at the left and right ends, and in particular, when the cord member is buried on the inner peripheral side and is buried, the core body is broken even if ear cutting occurs. The crack does not reach immediately and the life as a rubber crawler will be extended accordingly. The inclination angle of the cord member with respect to the core is 0 to 90 degrees, preferably 20 to 80 degrees, and more preferably 40 to 70 degrees.

[0010]

EXAMPLES The rubber crawler of the present invention will be described in detail below with reference to examples. 2 is a cross-sectional view in the width direction showing a first example of the rubber crawler 10 of the present invention, and the right side of FIG. 3 is a plan view showing the relationship between the core body and the cord member. In the figure, reference numeral 1 is a rubber elastic body that extends endlessly on the front and back of the paper,
Reference numeral 2 is a guide formed at the center on the inner peripheral side with a constant pitch, and 3 is a lug formed on the outer peripheral side. All of these are formed integrally with the rubber elastic body 1. Reference numeral 4 denotes a core body made of a steel cord row embedded in a row in the width direction of the rubber elastic body 1. In this example, the wheel 20 is provided.
It is embedded in the rubber elastic body 1 with a width substantially equal to the left-right width.

Reference numeral 5 is a cord member, which is a steel cord which is embedded in the inner peripheral side of the core body 4 by overlapping the left and right ends of the core body by 4 cm and has a wire diameter of 0.5. ~
It is a cord of 1 mm. The inclination angle θ is about 60 degrees. It should be noted that the inclination angle θ includes 0 degrees.
The left side of is the plan view. Then, it is embedded up to the ear portion 1a which is about 2 cm outside the left and right width of the wheel 20. The depth h in which the code is embedded is preferably 0.5H or less with respect to the depth H in which the core body 4 is embedded.

Now, when the rubber crawler according to the present invention is wound around the drive wheel 20 and is used for turning, the ear portion 1a of the rubber crawler tends to be caught on the outer peripheral side. Since it is embedded, it is extremely reduced, the occurrence of edge cutting at that portion is suppressed, and the winding resistance of the rubber crawler does not become so large. The cord member 5 can exert its effect by being embedded in the bent portion of the ear portion 1a. However, by maintaining the relation with the embedded core body 4 in the above relation, the effect is particularly brought about. It goes without saying that this is something that is done.

FIG. 4 shows a second embodiment of the present invention, which is different from the first embodiment in that the arrangement of the core bodies 4 is buried slightly wider than the lateral width of the wheel 20. In this case as well, the cord member 5 is embedded up to the outside of the left and right ends of the wheel 20, and the cord member 5 is aligned with the left and right ends of the core body as shown in the figure, or further outside. It should be buried in the width.

[0014]

According to the present invention, a cord member is further embedded in the ear of the core of the rubber crawler, and the ear is cut off when the ear is caught during turning or the strain from the wheel is concentrated. It has a very high practical value.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a conventional rubber crawler in the width direction.

FIG. 2 is a widthwise sectional view showing a first example of the rubber crawler of the present invention.

FIG. 3 is a plan view showing the relationship between the core of the rubber crawler and the cord.

FIG. 4 is a cross-sectional view in the width direction showing a second example of the rubber crawler of the present invention.

[Explanation of symbols]

1. Rubber elastic body, 1a: rubber crawler ears, 2 ... guide, 3 ... rug, 4 Steel cord row (core), 5: Cord member, 10 ... rubber crawler, 20 ... wheel.

Claims (11)

[Claims] 1. A friction drive type rubber crawler in which a lug is formed on the outer peripheral side of a long rubber elastic body and guides are formed on the inner peripheral side at regular intervals, and a core body made of a steel cord row is embedded in the longitudinal direction thereof. A rubber crawler structure is characterized in that a cord member is embedded at an inclination angle with respect to the longitudinal direction corresponding to the left and right width ends of a drive wheel or an idler wheel. 2. The structure of the rubber crawler according to claim 1, wherein the cord member is embedded from the portion corresponding to the wheel to the outside beyond the left and right width ends. 3. The rubber crawler structure according to claim 1, wherein the cord member is embedded from 1 to 5 cm inside the left and right width ends of the wheel to 1 to 5 cm outside the left and right width ends. 4. The structure of the rubber crawler according to claim 1, wherein the core body is embedded from the portion corresponding to the wheel to the outside beyond the left and right width ends. 5. The structure of the rubber crawler according to claim 1, wherein the core is embedded only in a portion corresponding to the wheel. 6. The structure of the rubber crawler according to claim 1, wherein the cord members are embedded in the core body so as to overlap at the left and right ends of the core body. 7. The structure of the rubber crawler according to claim 6, wherein the cord member is located at the inner peripheral side of the left and right ends of the core body and embedded therein. 8. The structure of the rubber crawler according to claim 6, wherein the cord member is embedded at a right and left outer peripheral sides of the core body. 9. The structure of the rubber crawler according to claim 6, wherein the cord member is embedded with the left and right ends of the core body sandwiched from the inner peripheral side and the outer peripheral side. 10. The structure of the rubber crawler according to claim 1, wherein the cord member is a synthetic fiber cord. 11. The structure of the rubber crawler according to claim 1, wherein the cord member is a metal fiber cord.