JP3146532B2 - Rubber crawler core - Google Patents

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 a rubber crawler core used for running construction machines and civil engineering machines.

[0002]

2. Description of the Related Art Conventionally, iron crawlers have been used as running parts in construction machines and civil engineering machines. In recent years, rubber crawlers have been used as running parts. This rubber crawler is an endless belt made of a rubber elastic body. A large number of metal cores arranged side by side in the width direction are buried in rubber, and this is wrapped with steel code (tensile body). Because it is an enclosed structure, it is made of rubber, so vibration transmitted to the occupant is reduced, and even when traveling on a pavement road surface, it does not damage the road surface,
It was used favorably.

[0003] In these construction and civil engineering machines,
Generally, both iron and rubber crawlers can be mounted, and the rolling wheels provided on the fuselage are mounted on the top of the corners of the core bar that protrude toward the inner peripheral side of the rubber crawlers. Rolling. FIG. 5 is a plan view of a typical example of a core metal in a rubber crawler used for construction machines and the like, and FIG. 6 is a sectional view taken along line AA of FIG. . That is, in the drawing, 1 is a wing portion embedded in a rubber elastic body constituting a rubber crawler, and 2 is an engaging portion with a sprocket tooth. The engaging portion 2 generally has a circular surface in conformity with the sprocket teeth, and has a narrow cross section which is narrower than the wing portion 1. A corner 3 protruding from the inner surface of the rubber crawler with the engaging portion 2 interposed therebetween.
Are formed as a pair. The corner 3 has a function of preventing the wheel 3 from coming off from the wheel 4 provided on the machine, and a top surface 5 of the corner 3.
Is a running surface on which the rolling wheels 4 roll. Generally, the corner portion 3 is provided with overhang portions 6 on the left and right sides of the wing portion 1, and the top surface 7 of the overhang portion 6 is a gentle slope. Further, as another example of the core metal, there is a metal bar (not shown) having a flat surface up to the top surface 7 of the overhang portion 6.

Now, a corner 3 of the cored bar shown in FIGS.
When the wheel 4 rolls on the top surface 5 of the wheel,
That there when run on the top surface 7 of the corner portion 3, being inclined in the X-direction core metal becomes a cantilevered to particular overhanging portion ₆₁ receives the top surface 5 of the corner of the aircraft weight is avoided I can't. The mandrel in this state is indicated by a dashed line, but the rolling wheel 4 tends to sink slightly with this inclination. When the wheel 4 is located at the position B, that is, in the central region of the top surface 5 of the cored bar, the wheel 4 returns to its original height. Upon reaching the overhang 6 ₂ of the top surface 5 of the metal core, it will be inclined in the Y direction by the previous as well as aircraft weight, track rollers 4 so that the sinks again. The core metal in such a state is indicated by a two-dot chain line. Summarizing the above phenomena, the rolling wheel that rolls on the top surface of the core metal sinks, that is, rolls while moving up and down, so that vibration to the occupant always occurs. Therefore, measures to prevent this vibration were urgently needed.

[0005] Further, even when the top surfaces of the mandrel are all flat, the above-described sinking phenomenon cannot be avoided, and in this case, the rolling wheel moves from the top surface of one mandrel to the top surface of the next mandrel. When the vehicle moves, collision between the wheel and the end of the protruding portion of the cored bar cannot be avoided, and a new vibration may be generated together with the generation of abnormal noise.

FIG. 7 shows another example of the cored bar. FIG. 7 is a plan view of the core metal similar to FIG. 5, but in this example, the corner 13 has a shape in which the left and right overhangs are different. Also in this example, the top surface 15 of the corner portion 13 has a protruding portion 16 that is a gentle slope or a flat surface as in FIG. In the core metal of this example, a rolling wheel (not shown) that rolls on the top surface 15 is a preferable example because the rolling wheel alternately and continuously rolls on the left and right top surfaces 15 of the core metal. There are sinking wheels and overhangs 1
Collision between the wheel 6 and the wheel occurred, and vibration countermeasures were necessary.

[0007]

That is, in a rubber crawler used for a large-sized machine such as a bulldozer or a power shovel, a core metal is moved right and left each time as a wheel passes. It tends to tilt, which not only becomes a source of vibration for the occupant, but also causes crack breakage of the rubber elastic body, and has the disadvantage of significantly shortening the life of the rubber crawler. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned drawbacks, and it is an object of the present invention to suppress the inclination of a metal core in a rubber elastic body from side to side and to improve the durability as a rubber crawler.

[0008]

The present invention employs the following configuration to achieve the above object. That is, the gist of the present invention is to provide left and right wing portions embedded in a rubber elastic body, and an engaging portion with a sprocket tooth at the center, and a pair of corner portions are formed across the engaging portion. A corner of the rubber crawler, wherein the corners are provided with overhangs in front and rear in the circumferential direction of the crawler, the top surface of the overhang is set high, and the top surface is substantially flat. And a rubber slope which is continuous with a gentle slope substantially at the center of the corner, and is further connected to this so that the remaining top surface is substantially flat.
La core metal, preferably, both the overhang portion top surface and the corner center top surface are flat surfaces, the overhang portion top surface is set high, and both flat surfaces are gently sloped. It is characterized by being continuous.

In the present invention, the height of the top surface of the overhang is set higher than the height of the top surface at the center of the corner. It is preferable that the difference is substantially the same.

[0010]

According to the present invention, the corner metal has a protruding portion which is formed in a right and left opposite direction to the core metal, and the rolling wheels are continuously connected to the top surface of the corner portion one after another. This is based on the idea of taking advantage of the features and always considering the inclination amount (subsidence amount) of the cored bar, and lowering the corner central surface by this amount in advance. In other words, in the conventional cored bar, the sinking of the wheel when riding on the top surface, returning to the original height reaching the center of the top surface, and further sinking when moving away from the top surface While it was continuous, the center flat portion of the corner top surface was set to be as low as this sinking amount, so the rolling wheel kept almost constant height and rolled on the top surface That is to say. The difference in height between the central flat portion on the top surface and the flat portion on the overhanging portion depends on the number of heavy wheels of the machine body and the like, but generally it is desirable to provide a step of about 1 to 5 mm.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a plan view of a cored bar 20 of the present invention, and FIG. 2 is a cross-sectional view taken along line BB of FIG. In the figure, reference numeral 21 denotes a wing portion embedded in a rubber elastic body constituting a rubber crawler. An engaging portion 22 for engaging with a sprocket is formed at the center of the wing portion and is integrated therewith. A pair of corners 23 are formed with the engaging portion 22 interposed therebetween, and a rolling wheel 24 provided on the body rolls on a top surface 25 of the corner 23.

The corners 23, 23 are provided with overhangs 26 ₁ , 26 _{2 that} are opposite to the wings, and the central top surface 27 of the corner 23 and the overhang 26 The top surface 28 is a flat surface with the height of the top surface 28 being higher. The two top surfaces 27 and 28 are connected by a gentle inclined flat surface 29. The step (D) between the two flat surfaces is substantially the same as the sinking amount of the rolling wheel in the conventional cored bar as described above.

FIG. 3 is a schematic diagram showing the rolling relationship between the rolling wheel 24 and the cored bar 20 of the present embodiment.
That is there when run on the top surface 25 of the core metal 20 _first corner 23, track roller 24 rides in a state in which the top surface 28 ₁ of the corner portion 23 ₁ of the protrusion 26 ₁ is inclined, then Q position come roll with an inclined surface 29 ₁ that is, until the center top surface 27 ₁ of the corner 23 _1. Since the height of the central top surface 27 is set to be lower by the amount of sinking, even if it reaches this point,
Has almost no vertical movement. At this point, the rolling wheel 24 naturally rides on the central top surface 27 ₂ of the other corner 23 ₂ .

Then, the next R position, that is, the rolling wheel 24 is
0 ₁ away from, when attempts rolling into the top surface of the corner portion 23 ₃ of the next core bar 20 _2, turn roll rotary wheel 24 to tilt the protruding portion 26 ₂ is inclined faces 29 ₂ above to reach to the flat top surface 28 ₂ of the overhang portion 26 _2. Also in this case, the sinking of the rolling wheel 24 hardly occurs. Then, in the core metal 20 ₂ will be has already riding on the top surface 28 ₃ of the overhang portion 26 ₃ of the corner portion 23 _3, the top surface 25 of the subsequent Similarly corners 23
The rolling wheel 24 rolls without moving up and down.

FIG. 4 is a sectional view similar to FIG. 2 of a cored bar according to a second embodiment of the present invention. In FIG. 4, both flat top surfaces 27,
The connecting surface 28 is formed in a slightly curved shape to assure smooth running of the wheel.

[0016]

As described above, the present invention effectively prevents the occurrence of vibration due to the vertical movement during the rolling between the rolling wheel and the core by changing the shape of the rolling surface of the rolling surface of the core. A rubber crawler that eliminates discomfort caused by vibrations to the occupant during work or running and provides a rubber crawler with significantly reduced fatigue even during long hours of crew operation. .

[Brief description of the drawings]

FIG. 1 is a plan view of a metal core of the present invention.

FIG. 2 is a sectional view taken along line BB of FIG. 1;

FIG. 3 is a schematic diagram showing a relationship between a rolling wheel and core metal rolling.

FIG. 4 is a sectional view similar to FIG. 2 of a metal core according to a second embodiment of the present invention.

FIG. 5 is a plan view of a typical example of a conventional cored bar.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is a plan view of another example of the conventional cored bar.

[Explanation of symbols]

 20 mm core metal 21 mm core metal wings 22 mm core metal sprocket engaging portion 23 mm corner 24 mm wheel 25 mm top of corner 26 mm overhang 27 mm Central top surface of corner 28 ° Top surface of overhang 29 ° Slant flat surface

Claims (1)

(57) [Claims] 1. A rubber clamp having left and right wings embedded in a rubber elastic body, and an engaging portion with a sprocket tooth at the center, and a pair of corners formed between the engaging portions. A corner metal having an overhang portion in front and back of the crawler circumferential direction, the top surface of the overhang portion is set high, and the top surface is made substantially flat, A metal core for a rubber crawler, characterized in that a gentle slope is continuous with the approximate center of the corner, and the remaining top surface is substantially flat.