JPH05139344A - Rubber crawler - Google Patents

Abstract

PURPOSE:To provide a lightweight and inexpensive core metal which is used for a rubber crawler. CONSTITUTION:A rubber crawler consists of a core metal 10 which has a circular sectional outer peripheral surface and is embedded through the lateral arrangement in the width direction, keeping a certain pitch, in an endless rubber elastic body 21 and a steel cord 22 row which is externally surrounded on a ground surface side, and characterized that a core metal which forms a straight line in the longitudinal direction of the endless rubber elastic body and forms an engagement part 24 with a sprocket is expanded to the inner peripheral surface side, and each rubber band body is formed at the left and right, having the engagement part interposed. Preferably, the rubber crawler is formed by cutting the rubber between the contiguous core metal and expanding the core metal and forming an engagement part. Accordingly, the core metal 10 can be manufactured easily and lightweight, and since cost is low, the whole of the rubber crawler can be made lightweight at a low cost, and also the winding onto a sprocket, etc., is made smooth, and the rubber crawler in which vibration is reduced can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber crawler used for running parts of agricultural machinery and construction machines.

[0002]

2. Description of the Related Art Rubber crawlers have been used in the running parts of agricultural machinery for a long time, but in recent years, they have come to be widely used in the running parts of construction machines and civil engineering machines. A characteristic of the rubber crawler is that vibration transmission to the operator is reduced, and further, there is a great advantage that the road surface is not damaged when traveling on the pavement surface. In this rubber crawler, usually, a large number of cored bars formed by casting or forging are embedded at a constant pitch and are used for engagement with a sprocket that gives a driving force.

[0003]

However, this core metal is expensive, and some of the entire rubber crawler is the price of the core metal itself. Further, not only the core metal but also a rubber crawler having a very large weight and a wide width, there is a core metal with a weight of several Kg in some cases, and in order to embed several tens of them into the rubber, It is also said that the weight of the la increases as the handling becomes difficult. On the other hand, since the core metal embedded in the rubber has a flat plate shape, the winding rigidity becomes high when it is wound around a sprocket or an idler, and there is a problem that smooth winding is not given. It has been pointed out.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been earnestly developed to solve the above drawbacks, and as a result, a preferable result was obtained by using a cored bar having a circular cross section. The present invention has been developed further to reach the present invention.

That is, the gist of the present invention is to provide a cored bar having a circular outer peripheral surface with a circular cross section, which is embedded side by side in the width direction at a constant pitch in an endless rubber elastic body, and an enclosure on the grounding side. A rubber crawler consisting of the above-mentioned steel cord row, which forms a straight line in the longitudinal direction of the endless rubber elastic body, and bulges the core metal which becomes the engaging portion with the sprocket to the inner peripheral surface side. A rubber crawler is characterized in that a rubber band body is formed on the left and right sides of the engaging portion.

[0006] In general, the rubber between the adjacent cores is cut off and the cores are bulged to form an engaging portion, and the cutout reaches the outer peripheral side. The engaging portion of the core metal is preferably formed to be thicker than the other portions, and the thick end portions are covered by the left and right rubber strips, and in particular, the cross-sectional outer shape is circular. A cored bar is used in which a ring body is fitted to the engaging portion of a homogeneous rod body. Such a cored bar may be a metallic round bar typified by steel or a hollow round bar. And, in some cases, it may be a round bar made of aluminum alloy or FRP,
Especially in these cases, weight reduction is achieved. In the latter case, a superalloy or ceramic ring body having particularly excellent wear resistance is generally fitted to the engaging portion.

Further, the left and right rubber strips are formed as a top surface having a height difference in the longitudinal direction, and the top surface is formed symmetrically with respect to the width direction of the iron shoe. It is effective when using a rubber crawler that is also used as a lathe. Then, the inner peripheral surfaces of the left and right rubber rollers of the rubber strip are formed with a ridge shape having a core metal portion as a peak and a middle portion as a valley, and the valley bottom portion is a substantially central portion of the core metal.

[0008]

The present invention has a great feature by adopting the above-mentioned constitution, and the price of the core bar can be reduced without impairing the performance as a rubber crawler, and the price of the rubber crawler is also low. It has become. In particular, if an aluminum alloy or FRP cored bar is adopted, it will greatly contribute to the weight reduction of the rubber crawler. Further, since the outer peripheral surface of the cored bar is circular, winding around a sprocket or the like is performed without any resistance, resulting in smooth rotation. On the other hand, by forming a ridge shape on the inner peripheral surface of the rubber crawler, the above-mentioned winding becomes smooth, and thereby the wasteful amount of rubber is saved and the weight reduction of the rubber crawler as a whole is promoted. It also becomes.

[0009]

The present invention will be described in more detail with reference to the drawings. First, the core metal 10 used in the present invention will be explained. FIG. 1 is a representative example of the core metal 10 used in the present invention, in which a solid steel round bar is used as a core body 11. The ring body 12 made of a superalloy having excellent wear resistance is provided on the part that contacts the engaging part
It is a composite type core body 10 in which

In the cored bar shown in FIG. 2, the engaging portion is formed thick 13 and the other portions are formed thin 14 to form an integral core body 1.
It is 0.

The core metal shown in FIG. 3 has a solid portion 1 at its engaging portion.
5 is an example of a cored bar 10 in which other parts are hollow 16

Although not shown, it is also possible to use a FRP round bar as a core body and insert a superalloy or ceramic ring body only in the engaging portion to form a core bar. It is a metal core having a shape almost similar to. Also, in some cases, the core metal 10
It is conceivable to make the tip end of the and slightly flat.

Next, the rubber crawler of the present invention will be illustrated using the core metal 10 shown in FIG. That is, FIG. 4 is a plan view of the inner peripheral surface side of the rubber crawler 20 of the present invention, which is continuous in the vertical direction of the drawing. And Figure 5 shows this rubber
FIG. 6 is a plan view of the outer peripheral surface side of the rubber crawler 20, and FIG. 6 is a side view of the rubber crawler 20. Further, FIG. 7 is a rubber cross-section of FIG.
FIG. 8 is a sectional view taken along line GG in FIG.
3 is a cross-sectional view taken along line HH of FIG.

The core metal 10 is embedded side by side in an endless rubber elastic body 21. And this rubber elastic body 21
Inside, the core code 10 is surrounded by a steel code 2
2 is embedded in the longitudinal direction. or,
A lug 23 is formed on the outer peripheral surface of the rubber elastic body 21 so as to face the core metal 10 to form a rubber crawler 20.

As shown in FIG. 1, the cored bar 10 has a ring body 12 fitted in the center of a cored body 11 and is engaged with a sprocket (not shown). Joint part 2
It becomes 4. And the ring body 1 of the adjacent core metal 10
The rubber between the two has a cut-out shape, and the ring body 12 is bulged while being covered with the rubber. This rubber cutout 25
Has a hole 26 extending to the outer peripheral side of the rubber elastic body 21. Therefore, sand or pebbles accumulated on the inner peripheral side of the rubber crawler 20 can be discharged through this hole 26. Becomes

On the other hand, with respect to the engaging portion 24 that abuts on the ring body 12, the two-step top surface 2 with respect to the longitudinal direction of the rubber elastic body 21.
A strip 29 is formed by forming 7 and 28, and in this example, the high top surface 27 is the inside. This strip 29 is
Although not shown in the figure, it serves as a contact surface for the wheels, sprockets, idlers, etc. provided on the machine body.For example, in the case of a wheel having a small diameter wheel at the center and large diameter wheels at both ends, Contact rolling on the top surface 28, and the center top surface 2
7 and this stepped portion perform control for preventing disengagement from the wheel. Of course, the center portion of the rolling wheel may make contact with the top surface 27 and roll.

As can be seen from this example, it is preferable that both ends of the ring body 12 fitted in the core metal 10 are covered with the strips 29, so that the core body 11 and the ring body 12 are not displaced from each other. It will be fixed. In particular, it is preferable that both ends of the ring body 12 be buried immediately below the high top surface 27 of the band body 20.

On the inner peripheral surface of the rubber elastic body 21 on both sides of the strip 29, it is preferable that the rubber between the cored bars has a ridge shape 30, and the rubber portion at this portion is removed. As a result, wrapping around a sprocket or the like becomes extremely smooth. Of course, there is also an aim to remove unnecessary rubber and provide a lightweight and inexpensive rubber crawler. Although not shown, particularly the top surface 2 of the strip 29
In No. 7, forming slits or V-cut grooves at regular intervals makes the winding more smooth.

[0019]

[Effect] Since the present invention is a rubber crawler adopting the above-mentioned structure, the manufacturing of the core metal is easy and lightweight,
Furthermore, since a low-cost core metal is used, the rubber crawler is a lightweight and inexpensive product as a whole, and the winding around the sprockets is smooth, which reduces the lumpy feel and reduces vibration. It is possible to provide a rubber crawler having a reduced amount.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a first embodiment of a cored bar of the present invention.

FIG. 2 is a perspective view showing a second embodiment of the cored bar of the present invention.

FIG. 3 is a perspective view showing a third embodiment of the cored bar of the present invention.

FIG. 4 is a plan view of an inner peripheral surface side of the rubber crawler of the present invention.

FIG. 5 is a plan view of the outer peripheral surface side of the rubber crawler of FIG.

FIG. 6 is a side view of the rubber crawler of FIG.

7 is a cross-sectional view taken along the line G-G of the rubber crawler of FIG.

FIG. 8 is a sectional view taken along line HH of the rubber crawler of FIG.

[Explanation of symbols]

 10 core metal 11 core body 12 ring body 13 thick formation part of core body 14 thin formation part of core body 15 solid part of core body 16 hollow part of core body 20 rubber crawler 21 endless rubber elastic body 22 stainless steel core -Drag 23 Lug 24 Engagement portion with sprocket 25 Rubber cutting portion 26 Rubber cutting hole 27 High top surface 28 Low top surface 29 Band 30 Crawler inner peripheral ridge portion

Claims (6)

[Claims] 1. A cored bar having a circular outer peripheral surface having a circular cross section which is embedded side by side in a width direction at a constant pitch in an endless rubber elastic body, and a steel cord which is surrounded by a grounding surface side. A rubber crawler consisting of a row and a straight line in the longitudinal direction of the endless rubber elastic body, and the core metal serving as an engaging portion with the sprocket is bulged to the inner peripheral surface side, and the engaging portion A rubber crawler that is formed by sandwiching a rubber band on both sides. 2. The rubber crawler according to claim 1, wherein the rubber between the adjacent cores is cut off and the cores are bulged to form an engaging portion. 3. The rubber claw according to claim 1, wherein the engaging portion of the core metal is formed thicker than the other portions, and the thick end portions are covered by the left and right rubber strips. La. 4. The rubber crawler according to claim 4, wherein a core body formed by fitting a ring body to an engaging portion is used on a homogeneous rod body having a circular cross section. 5. The rubber crawler according to claim 1, wherein the inner peripheral surfaces of the left and right rubber crawlers of the rubber strip are ridge-shaped, with the cored bar portion as a peak and the middle thereof as a valley. 6. The rubber strip according to claim 1, wherein the left and right rubber strips are formed as a top surface having a height difference in the longitudinal direction, and the top surfaces are formed symmetrically with respect to the width direction. Rubber cross
La.