JPH06270858A - Rubber crawler - Google Patents

Abstract

PURPOSE:To make mud stuck to an outer circumferential surface of rubber crawler easily removable from a space between rubber lugs to enhance various performance of rubber crawler by coating the outer circumferential surface at least between the rubber lugs in a rubber elastic body with an elastic material having water repellency higher than the rubber elastic body. CONSTITUTION:In a rubber crawler, core bars 12 are embedded at a specific interval in a rubber elastic body 11. In the rubber elastic body 11, steel cords 13 are embedded in the longitudinal direction in such a manner as to surround the core bars 12. In an outer circumferential surface of rubber elastic body 11, large and small rubber lugs 14, 15 are arranged corresponding to the core bars 12. In this constitution, the outer circumferential surface at least between the rubber lugs 14, 15 in the rubber elastic body 11 is coated with an elastic material having water repellency higher than the rubber elastic body 11. Namely, an ultra-high molecular weight polyethylene sheet 16 as the elastic material having high water repellency is stuck to the outer circumferential surface of rubber elastic body 11. As the ultra-high molecular weight polyethylene sheet 16, a material having molecular weight of 3000 thousands or more is adopted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a rubber crawler, and more specifically, a rubber crawler having a good mud-repelling property.
It is to provide LA.

[0002]

2. Description of the Related Art Rubber crawlers are widely used as traveling parts of agricultural machines, but rubber crawlers used in wetlands are required to have good mud-repelling properties.
Fig. 1 shows a typical example of a rubber crawler.
The mud accumulated between the rubber lugs 3 and 3 of the rubber crawler 1 must be dropped between about 90 degrees when the la 1 is wrapped around the idler-2. The mud does not easily fall until the la 1 comes in contact with the ground again via the sprocket 4, and even if the mud comes into contact with the ground in this state, it hardly gives a driving force. Also, the rubber lug 3,
If mud is stuck between the three, the turning performance will be poor, and there will be many problems such as lateral shake.

Therefore, many ideas have heretofore been proposed for improving the mud-repelling property of rubber crawlers. One of them is Japanese Patent Laid-Open No. 56-8766, and Japanese Laid-Open Patent Publication No.
No. 7-4478. The former is what is called a plate-type crawler, which tries to secure the driving force by increasing the height of the rubber lugs on both wings, and the latter is usually called a ladder-type crawler, which is used for both wings. It was dealt with by lacking the rubber between the rubber lugs.

[0004]

However, the former plate-type chlora is not completely mud-repellent, although it depends on the type of mud. Although it has good abrasion resistance, it is pointed out that the body of the rubber crawler sinks. The present invention has sufficiently taken these points into consideration, and an object of the present invention is to provide a rubber crawler having a good mud-repelling property even though the overall structure is the same as the conventional one.

[0005]

In order to achieve the above object, the present invention provides a rubber crawler having the following constitution. That is, the gist of the present invention is to provide an endless rubber elastic body, a cored bar that is lined up side by side with the cored bar and embedded at regular intervals, a tensile body that surrounds the cored bar, and an outer circumference of the endless rubber elastic body. A rubber crawler consisting of a rubber lug formed on the surface, at least the outer peripheral surface between the rubber lugs of the rubber elastic body,
The present invention relates to a rubber crawler characterized by being covered with an elastic material having higher water repellency than the rubber elastic body.

Specifically, the present invention relates to a rubber crawler in which an ultrahigh molecular weight polyethylene sheet having a molecular weight of 3,000,000 or more is adhered to the surface between rubber lugs as an elastic material having high water repellency.

[0007]

In the rubber crawler of the present invention, at least the rubber lugs are covered with a water-repellent elastic material on the outer peripheral surface thereof. Therefore, mud containing a large amount of water is sandwiched between the rubber lugs. But this will soon drop out. Therefore, when the rubber crawler comes into contact with the ground again, the mud between the rubber lugs has almost completely fallen off, the propulsive force is secured, and the turning performance is not deteriorated.

As the water-repellent elastic material used here, nylon or Teflon resin may be used, but an ultra high molecular weight polyethylene resin sheet is preferably used.
Such ultra-high molecular weight polyethylene resin is, for example, Hi-Zex Million (molecular weight 3,000,000) manufactured by Mitsui Petrochemical Co., Ltd., and the sheet thickness thereof is preferably about 0.1 to 2 mm. Table 1 shows data on water repellency (contact angle with water) and coefficient of friction. From this table, ultrahigh molecular weight polyethylene is compared with the rubber elastic body that is the base of the chlora. Then, there is a great feature, and it is understood that when this is adopted for the outer peripheral surface between the rubber lugs of the rubber crawler, a great effect is brought about.

[0009]

[Table 1]

[0010]

EXAMPLES The present invention will be described in more detail with reference to examples. 2 is a cross-sectional view of the rubber crawler of the present invention, and FIG. 3 is a plan view of the outer peripheral side of the rubber crawler of FIG.
That is, in the rubber elastic body 11 which is the base of the rubber crawler,
The cored bar 12 is embedded at a constant pitch.
A steel code 13 is embedded in the longitudinal direction so as to surround 2. On the outer peripheral surface of the rubber elastic body 11, large and small rubber lugs 14 and 15 are provided corresponding to the core metal 12. Therefore, as can be seen in the figure, a large flat surface is formed on the outer peripheral surface of the rubber crawler between the both ends of the small lug 15 and the large lug.

In the present invention, however, in order to efficiently drop the mud that is sandwiched between these portions and adheres to the outer peripheral surface of the rubber elastic body 11, the above-mentioned ultra high molecular weight polyethylene sheet 16 ( The thickness is 1 mm). Therefore, on the outer peripheral surface of the rubber crawler,
At least the mud that came into contact with this surface was efficiently separated without adhering to this surface, and a predetermined propulsion force was secured when the rubber crawler re-grounded. It is a thing.

The water repellent material (ultra high molecular weight polyethylene sheet) may be attached to the surface after the rubber elastic body is vulcanized and molded, but in some cases, it may be set in the mold. In addition, it goes without saying that the rubber elastic body may be attached by the adhesive force during vulcanization.

FIG. 4 is a diagram in which the present invention is applied to another example of a rubber crawler, in which the rubber lug 17 extends in the entire width direction of the rubber elastic body 11. The ultra high molecular weight polyethylene sheet 18 (thickness: 1 mm) is attached to the entire outer peripheral surface of the rubber elastic body 11 in the width direction except the rubber lug 17.

In the above-mentioned drawings, reference numeral 19 is a sprocket engaging hole, and 20 is a pair of corner portions projecting from the core metal 12 to the inner peripheral surface side of the rubber elastic body 11.

[0015]

EFFECTS OF THE INVENTION Since the present invention has the above-mentioned structure, the mud attached to the outer peripheral surface of the rubber crawler can be easily separated from between the rubber lugs. The turning performance is ensured and the lateral shake of the rubber crawler is significantly reduced.

[Brief description of drawings]

FIG. 1 is a side view showing an overall view of a rubber crawler.

FIG. 2 is a cross-sectional view of the rubber crawler of the present invention.

FIG. 3 is a plan view of an outer peripheral side of the rubber crawler of FIG.

FIG. 4 is a plan view of an outer peripheral side of a rubber crawler according to another example of the present invention.

[Explanation of symbols]

 1 ... Rubber Crawler, 2 ... Idler, 3 ... Rubber Lug, 4 ... Sprocket, 11 ... Rubber Elastic Body, 12 ...・ ・ ・ Rubber lugs, 16, 18 ・ ・ ・ Ultra high molecular weight polyethylene sheet, 19 ・ ・ ・ Sprocket engaging holes, 20 ・ ・ ・ Corners of core metal.

Claims (3)

[Claims] 1. An endless rubber elastic body, a cored bar which is lined up side by side and embedded at regular intervals, a tensile body which surrounds the cored bar, and an outer peripheral surface of the endless rubber elastic body. A rubber crawler comprising a rubber lug formed as described above, wherein at least an outer peripheral surface between the rubber lugs of the rubber elastic body is covered with an elastic material having higher water repellency than the rubber elastic body. 2. The rubber crawler according to claim 1, wherein an ultrahigh molecular weight polyethylene sheet is used as the elastic material having high water repellency. 3. The rubber crawler according to claim 2, wherein a molecular weight polyethylene sheet having a molecular weight of 3,000,000 or more is used.