JPH05162666A - Core metal for rubber crawler - Google Patents

Abstract

PURPOSE:To prevent roller slip-off by forming a gap between the protruding part of an angular part and the protruding part of an auxiliary protrusion, and making an auxiliary protrusion protruding from the opposite side into the protruding part to be fitted into the gap. CONSTITUTION:In core metal 10 embedded in a rubber elastic body, the protruding part 162 of an auxiliary protrusion 16 is fitted into a gap 181 formed between an angular part 14 and the auxiliary protrusion 16, and the protruding part 171 of an auxiliary protrusion 17 is fitted into a gap 182 formed between an angular part 15 and the auxiliary protrusion 17 on the opposite side. The core metal is thus formed in such a way that the gaps 181, 182 and auxiliary protrusions 162, 171 are fitted one another in regular succession between the core metals embedded adjacently in the rubber elastic body. Accordingly, even if force causing the lateral dislocation and torsion of the core metals works in a rubber crawler, its fitting does not easily come off, so that the generation of slip-off between a roller and a sprocket is reduced considerably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber crawler, and more particularly to the structure of a core bar of a rubber crawler used for running construction machines and civil engineering work machines.

[0002]

2. Description of the Related Art Conventionally, an iron crawler has been used as a running part in construction machines and civil engineering work machines, but in recent years, a rubber crawler has been adopted as the running part. This rubber crawler is an endless strip of a rubber elastic body, and a large number of metal cores arranged side by side in the width direction are embedded in the rubber, and a steel cord (tensile body) is used. Since it is an enclosed structure, it is made of rubber, so it reduces vibration transmitted to occupants, and even when traveling on a paved road surface, it does not damage the road surface,
It was decided to be used. In these construction machines and civil engineering work machines, in general, both an iron shoe crawler and a rubber crawler can be mounted, and the rolling wheels mounted on the machine body protrude to the inner peripheral surface of the rubber crawler. It rolls on the top surface of the corner portion of the cored bar.

FIG. 1 shows a plan view of a typical cored bar among cored bars in a rubber crawler used for construction machines and the like. That is, in the figure, 1 is a rubber cross
2 is a wing portion embedded in a rubber elastic body that constitutes a la.
Is an engaging portion with a sprocket tooth. This engaging portion 2 is
Generally, the surface is made circular to match the sprocket teeth,
It is narrower than the wing 1 and has a semi-cylindrical cross section. A pair of corners 3 are formed so as to protrude from the inner surface of the rubber crawler with the engaging portion 2 interposed therebetween. This corner 3
Has a function of preventing disengagement from the rolling wheels 4 provided on the machine body, and the top surface 5 of the corner portion 3 is a rolling surface on which the rolling wheels 4 pass and roll.

Now, the top surface 5 of the corner portion 3 of the core metal shown in FIG.
When the rolling wheel 4 rolls on the top surface 5 of the corner portion 3 when the rolling wheel 4 rolls over, the body weight is received by the top surface 5 of the corner portion, especially the bulging portion 6 _1. , The core metal is cantilevered and it is unavoidable that the core metal tilts. Therefore, the rolling wheel 4 tends to slightly sink with this inclination. When the rolling wheel 4 is in the central area of the top surface 5 of the core metal, the rolling wheel 4 returns to the original height. Upon reaching the the bulging part 6 _{and second} top surface 5, will be inclined in the direction opposite to the previous by aircraft weight, track rollers 4 so that the sinks again.

Summarizing the above phenomena, the rolling wheel rolling on the top surface of the core metal repeats ups and downs, and rolls while moving up and down. For this reason, vibrations to the occupants are constantly occurring, and measures to prevent this vibration have become an urgent task. That is, in the rubber crawlers used in large machines such as bulldozers and power shovels, the core metal tends to incline to the left and right with the passage of the rolling wheels, which tends to affect the occupant. Not only is it a source of vibration, but there is a risk of derailment, and improvements have been sought.

Therefore, as shown in FIG. 2, the corner portion 3 of the core metal is
It has been proposed to extend the tips of the ridges and form recesses 7 and 8 so that the tips are fitted to each other in the front-rear direction, and the recesses 7 and 8 are used for adjacent cores to sequentially fit the tips of the corners 3. There is.

[0007]

However, in this rubber crawler, although the sinking of the rolling wheels as described above can be considerably prevented, another drawback is pointed out. That is, when the rubber crawler rides on a pebble or the like while running,
The rubber crawler causes a so-called reverse warp phenomenon in which the inner peripheral surface of the crawler warps. This means that the corners 3 and 3 are bent in a direction away from each other, and therefore, the above-mentioned fitting of the corners 3 and 3 is released, which also causes derailment.

Further, in addition to this, when the rubber crawler is inclined, the core metal is displaced laterally, and the corner portion 3,
The tips of 3 will collide with each other. For this reason, the tips of the corners 3 may be damaged, and the rolling wheels 4 may be removed. Also, if the rubber crawler runs on a sloping ground, the core will inevitably be displaced in the lateral direction, but in the example shown in the figure, there is a single point of support between adjacent cores, and the corners are also Will be caused.

That is, in the drawing, when the core metal B is displaced in the X direction with respect to the core metal A, the outside of the left corner portion 3 of the core metal A and the inside of the left corner portion 3 of the core metal B. Only the side surfaces support each other, and the force concentrates here, leading to damage to the corners 3.

[0010]

The present invention has been made to solve these problems in the prior art, and the gist of the invention is to provide left and right blades embedded in a rubber elastic body. , The central part that connects this and the central part,
And a pair of corners projecting forward and backward from the width of the wing and auxiliary lugs formed on both outsides of the corners and projecting forward and backward than the width of the wing. A core metal, wherein a gap is formed between the protrusion of the corner and the protrusion of the auxiliary protrusion, and the auxiliary protrusion protruding from the opposite side is a protrusion that fits into the gap. Which is applied to the core bar for the rubber crawler, which is generally
The auxiliary protrusion has a surface that is higher than the surface of the wing portion, and in some cases, the auxiliary protrusion is divided into front and rear at approximately the center in the width direction of the wing portion.

[0011]

According to the present invention, as described above, the tip of the mandrel arranged next to the opposite side of the auxiliary protrusion fits in the gap between the corner projecting forward and backward of the mandrel and the auxiliary protrusion. Therefore, even if a lateral shift force acts on the rubber crawler, this fit will not come off. or,
Since there are two left and right fittings between adjacent cores, even if a twisting force acts on the rubber crawler, this will not come off, and the derailing between the rubber crawler and the rolling wheels or idlers will not occur. It will never happen.

Further, even if the cores come into contact with each other, since they contact at the above-mentioned two places, the burden load at the contact portion is reduced to half and damage can be prevented.

Incidentally, a rubber cross for a construction machine or a civil engineering work machine.
When used as a core metal for a la, it is usually an iron shoe
In this case, the rolling wheel rolls on the top surface of the corner, but depending on the shape of the rolling wheel, the top surface of the auxiliary protrusion may roll, Of course, in some cases, the top surface of the corner and the top surface of the auxiliary protrusion may simultaneously be rolling surfaces.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in detail below with reference to the drawings. FIG. 3 is a plan view showing a first embodiment of a core bar for a rubber crawler of the present invention, and FIG. 4 is a side view thereof. In the figure, reference numeral 10 indicates a core metal, and 11 and 12 are left and right blades embedded in a rubber elastic body which is a main body of a rubber crawler. Reference numeral 13 is a central portion that connects the wing portions 11 and 12, and is generally an engaging portion with a sprocket (not shown) that transmits a driving force. Corners 14 and 15 are formed on the wings 11 and 12 with the sprocket engaging portion 13 interposed therebetween. The corner portions 14 and 15 are the wing portions 1 of the core metal 10.
The widths of the corners 14 and 15 are projected forward and backward than the widths of 1 and 12, and the projections of the corners 14 and 15 are referred to as 14 ₁ and 15 ₂ .

On the other hand, auxiliary protrusions 16 and 17 are formed on both outer sides of the corners 14 and 15, respectively.
Protrudes forward and backward than the width of the wing portions 11 and 12 of the cored bar 10, and the protruding portions thereof are 16 ₁ , 16 ₂ , 17 ₁ and 17 ₂
And As can be seen in the figure, the downwardly projecting portions of the cored bar 10 on the paper surface are 16 ₁ and 17 ₁ , and the upwardly projecting portions are 16 ₂ and 17 ₂ .

Now, the downward protruding portion 14 ₁ of the corner portion 14
And a downwardly projecting portion 16 ₁ of the auxiliary projection 16 are formed with a gap 18 ₁ to the extent that the width of the projecting portion 16 ₂ is fitted, and similarly, an upwardly projecting portion 15 ₂ of the corner portion 15 is formed. And a similar gap 18 between the upward protrusion 17 ₂ of the auxiliary protrusion 17.
Form ₂ . Conversely speaking, the protrusion 16 _{2 of} the auxiliary protrusion,
The width 17 ₁ has a width sufficient to fit between the gaps 18 ₁ and 18 ₂ and is formed in a state where the outer corner portion is missing in the illustrated example.

FIG. 5 shows a state of the cored bar 10 embedded in a rubber elastic body (not shown). As can be seen from the figure, in the cored bar 10 embedded in the rubber elastic body, the protruding portion of the auxiliary protrusion 16 is inserted into the gap 18 ₁ formed between the corner portion 14 and the auxiliary protrusion 16. 16 ₂ fits in, and the protrusion 17 ₁ of the auxiliary protrusion 17 fits into the gap 18 ₂ formed by the corner 15 and the auxiliary protrusion 17 on the opposite side.

As described above, in the cored bar of the present invention, the gap 18 is provided between the cored bars that are adjacently embedded in the rubber elastic body.
₁ , 18 ₂ and the auxiliary protrusions 16 ₂ , 17 ₁ are sequentially fitted to each other. Therefore, even if the core bar is laterally displaced or twisted in the rubber crawler, the fitting is easily performed. It did not come off, and the occurrence of wheel loss between the wheel and sprocket has become extremely low. In addition, it is preferable that the corner portions 14 and 15 are always overlapped with each other when viewed from the side as shown in the figure in order to reduce vibration.

FIG. 6 shows a core bar 10 for a rubber crawler according to the present invention.
It is a plan view showing a second embodiment of the auxiliary projections 16, 17
Is 2 at the center of the wings 11 and 12 of the core metal 10 in the width direction.
It is an example divided into two. The other configuration is the same as the previous example.

As can be seen from these figures, there are two mutually fitting portions between the cores that are embedded in the rubber and are adjacent to each other, and the load due to contact divides into two. The damage etc. will be reduced. In each of these examples, the auxiliary protrusion 1
Wings 1 and 6 are used as rolling surfaces of the rolling wheels.
It is formed to be slightly taller than that of Nos. 1 and 12, and the wings 11 and 12 are embedded in rubber so that the top surfaces of the protrusions 16 and 17 are exposed at the inner peripheral surface of the rubber crawler. is there.

[0021]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, even if the rubber crawler travels on a slope or rides on a pebbles, no wheel derailment occurs and the core metal is not damaged. This is a remarkably reduced core for rubber crawlers.

[Brief description of drawings]

FIG. 1 is a plan view of a cored bar in a conventional rubber crawler.

FIG. 2 is a plan view of an improved cored bar.

FIG. 3 is a plan view showing a first embodiment of a core bar for a rubber crawler of the present invention.

FIG. 4 is a side view of the cored bar shown in FIG.

FIG. 5 shows a state of a cored bar embedded in a rubber elastic body.

FIG. 6 is a plan view showing a second embodiment of a mandrel for a rubber crawler of the present invention.

[Explanation of symbols]

10 ... Mandrel, 11, 12 ... Wing of mandrel, 13 ... Central part (engagement part) of mandrel, 14, 15 ... Corner of mandrel, 141 ₁ , 15 ₂ ... Corner Projections, 16, 17, ... auxiliary projections, 16 ₁ , 16 ₂ , 17 ₁ , 17 _2, ... auxiliary projection projections, 18 ₁ , 18 ₂ ... corner projections and auxiliary projection projections Gap between and.

Claims (3)

[Claims] 1. A left and right wing portion embedded in a rubber elastic body, a central portion connecting the wing portions, and a pair of corner portions sandwiching the central portion and projecting by being shifted forward and backward from a width of the wing portion. When,
A metal core for a rubber crawler, which is formed on both outer sides of the corner portion by projecting auxiliary protrusions that are displaced forward and backward from the width of the wing portion, the protrusion portion of the corner portion and the protrusion portion of the auxiliary protrusion. A core bar for a rubber crawler, characterized in that a gap is formed between the two, and an auxiliary protrusion that protrudes from the opposite side is a protrusion that fits into the gap. 2. The core bar for a rubber crawler according to claim 1, wherein the auxiliary protrusion has a surface that is raised more than a surface of the wing portion. 3. The rubber claw according to claim 1, wherein the auxiliary protrusion is divided into front and rear at approximately the center in the width direction of the wing portion.
La metal core.