JPH04254270A - Core metal for rubber crawler - Google Patents

Abstract

PURPOSE:To impede generation of turning force to the right/left of a core metal in a rubber elastic body so as to improve durability as a rubber crawler, relating to the core metal for improving the durability of the rubber crawler utilized mainly for a running part of construction and civil work machines. CONSTITUTION:A core metal 11 for a rubber crawler comprises blade members 12, 13 buried in a rubber elastic body to extend to the right/left, sprocket engaging part 14 positioned in the center of the blade members and arranged at right angles to a lengthwise direction of the rubber crawler and a pair of protrusions 15, 16 interposing this engaging part to serve as a running surface of a rolling wheel, to form the protrusion in a long scale toward the lengthwise direction of the rubber crawler arranged further longitudinally displaced and to substantially form the blade parts 12, 13 in a projection plane of the protrusion, for instance, arranging also the right/left blade parts 12, 13 displaced longitudinally corresponding to displacement of the protrusions 15, 16.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core metal for a rubber crawler, and more particularly to a core metal for improving the durability of rubber crawlers used in the running parts of construction machines and civil engineering work machines.

0002

2. Description of the Related Art Conventionally, iron shoe crawlers have been used as running parts in construction machines and civil engineering machines, but in recent years, rubber crawlers have been used as running parts. This rubber crawler is made of a rubber elastic body in the form of an endless band, and a large number of core metals arranged horizontally in the width direction are embedded in the rubber, and these are connected to steel cords. It has an enclosed structure, and since the crawler is made of rubber, it reduces the vibrations transmitted to the passengers, and it is also preferred because it does not damage the road surface even when driving on paved roads. It turned out that this was the case.

[0003] In these construction machines and civil engineering work machines,
In general, both iron shoe crawlers and rubber crawlers can be installed, and the rollers installed on the aircraft are mounted on the top surface of the protrusion extending from the core metal that protrudes toward the inner peripheral surface of the rubber crawler. is the running surface of the wheel. FIG. 6 is a plan view of the core metal 1 used in this kind of rubber crawler, and FIG.
is a side view of this core metal. This core bar 1 is made of rubber claw.
A large number of rubber elastic bodies are arranged at regular intervals in the band-shaped rubber elastic body constituting the rubber. In the figure, 2 and 3 are left and right wings embedded in the rubber elastic body (not shown) constituting the rubber crawler and extending in the width direction of the rubber crawler. A sprocket engaging portion 4 that receives force, and a pair of protrusions 5 and 6 sandwiching this engaging portion 4.
is formed. A rolling wheel 7 provided on the fuselage runs on the top surfaces of these protrusions 5 and 6.
In order to make the crawler run smoothly, the surfaces of the protrusions 5 and 6 are elongated in the longitudinal direction of the crawler.
, 3 are shifted back and forth in the opposite direction, and from another perspective, the bulges 8 and 9 are formed in opposite directions. FIG. 8 schematically shows the relationship between the core metal 1 and the rollers 7 in such a rubber crawler from a side view.

However, in FIG.
, 6, when the roller 7 rides on the top surface of the protrusion 5 at position A, the weight of the machine is received by the protrusion 5, especially the bulge 8, so that the center It is unavoidable that the gold 1 becomes cantilevered and generates a rotational force in the X direction. That is, since there is no wing section in the projected area of the bulge 8 that supports the weight of the aircraft, the bulge 8 is supported in a cantilevered manner. Then, the wheel 7 is in position B,
In other words, when running approximately in the center of core metal 1, core metal 1
does not tilt, but when the wheel 7 moves away from position C, that is, from the top of this protrusion 6, to the top of the next core 1, the weight of the machine expands. Because it takes part 9,
The core metal 1 also has a cantilevered shape and generates a rotational force in the Y direction, which is opposite to the X direction.

[0005]

[Problem to be solved by the invention] In other words, in rubber crawlers used in large machines such as bulldozers and power shovels, the core bar moves left and right as the wheels pass. The rotational force is exerted, and the ability to prevent this is dependent on the adhesive force between the rubber and the wing parts 2 and 3 embedded in the rubber elastic body of the core metal 1. This rotational force not only becomes a source of vibration for the occupants, but also causes separation between the rubber elastic body and the core metal, which has the disadvantage of significantly shortening the life of the rubber crawler. was there.

[0006] The present invention aims to solve these drawbacks, and aims to improve the durability of the rubber crawler by preventing the generation of horizontal rotational force of the core bar in the rubber elastic body. Its purpose is to provide a core metal with a high quality.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention employs the following configuration. That is, the first aspect of the invention is a wing part embedded in a rubber elastic body extending left and right, a sprocket engaging part located at the center thereof and arranged at right angles to the longitudinal direction of the rubber crawler, and this engagement part. A core metal of a rubber crawler consisting of a pair of protrusions that serve as running surfaces for the rolling wheels sandwiching the parts, the protrusions being elongated in the longitudinal direction of the rubber crawler and arranged so as to be staggered back and forth. A second aspect of the invention resides in the core metal of a rubber crawler, characterized in that wing portions are substantially formed on the projection plane of the protrusion. , a rubber crawler characterized in that the protrusions are elongated in the longitudinal direction of the rubber crawler and are arranged so as to be shifted back and forth, and the left and right wing portions are also arranged so as to be shifted back and forth in correspondence with the protrusions. It is attached to the core metal of the la. Preferably, the bottom surface of the wing portion of the metal core is a gently arcuate surface, or at least the side shifted forward and backward is chamfered a little.

[0008]

[Function] In the present invention, the horizontal rotational force of the core metal generated when the rolling wheels run on the protrusion of the core metal that protrudes from the inner circumferential surface of the rubber crawler, in other words, the left and right rotational force of the core metal wings. The present invention is intended to minimize the inclination by changing the arrangement of the wings embedded in the rubber elastic body according to the arrangement of the protrusions.

In conventional rubber crawlers of this kind, the core metal used therein is generally formed with the left and right wing parts in a straight line in the form of rectangular strips as shown in FIG. No matter how the protrusion that forms the running surface of the aircraft was shifted relative to this wing, the wing remained unchanged. In other words, the conventional core metal has a tip (
Due to the weight of the fuselage applied to the bulge, the tips of the protrusions become cantilevered and the core metal is tilted. Normally, the inclination is controlled by the adhesive strength with the core metal of the present invention, but when the wheel first rides on the tip (bulge) of the protrusion, the weight of the machine body is controlled. In order to support the protrusion, a wing is substantially present directly below the tip (bulge), that is, in the projection area.For example, by shifting the wing toward the bulge, it is possible to provide cantilever support. . In other words, in contrast to the conventional core metal that receives rotational force from the bulging portion of the protrusion, the core metal of the present invention is designed to prevent the rotational force from being applied to the wing from directly above the wing. It is designed to carry the weight of

[0010] This is exactly the same when the wheel is finally separated from the protrusion running surface of the core metal, and the tip (bulging portion) of the protrusion that is located last in the running direction of the wheel The tips of the protrusions (bulges) are designed to prevent the wing from being cantilevered against the weight of the aircraft, that is, to avoid applying rotational force to the wings.
At the same time, the wing portions are shifted to correspond to the tips of the protrusions. The wing portion corresponding to the bulging portion of the protrusion of the core metal is substantially present within the projection area, but the wing portion may be made wider relative to the bulging portion of the protrusion, or the wing portion It is also conceivable to shift the area toward the bulge. For these reasons, when the wheels run on the protrusions of the core metal, no matter where they are running, the wheels are directly above the blades, and the wheels do not apply any rotational force to the blades. This prevented gold from tilting to the left or right.

[0011] A core bar in which the left and right wing portions appear to be offset is described in, for example, Japanese Utility Model Application No. 57-176380, but this is fundamentally different from the structure of the present invention. In other words, the core metal described in this publication is not of the type in which wheels run on protrusions, and therefore there is no possibility of generating a rotational force on the core metal that would tilt it. Moreover, it is a friction-type rubber crawler without an engaging portion with sprocket teeth, and is applied to a rubber crawler that is completely different from the rubber crawler in which the metal core of the present invention is used.

0012

[Specific Examples] The present invention will be explained in more detail below with reference to the drawings. FIG. 1 is a plan view of a first embodiment of the core metal 11 of the present invention, and FIG. 2 is a side view of the core metal 11. FIG. 3 schematically shows the relationship between the core metal 11 and the rolling wheels 17 from a side view. In the figure, reference numerals 12 and 13 are wing parts, which are band-shaped rubber elastic bodies (not shown) that serve as the base of the rubber crawler.
buried in the width direction. And this wing part 12,1
A sprocket engaging portion 14 is formed between the sprocket engaging portions 3, and a pair of left and right protrusions 15 and 16 are formed sandwiching the engaging portion 14. The top surfaces of these protrusions 15 and 16 serve as running surfaces for rolling wheels 17 provided on the fuselage,
For this reason, the protrusions 15 and 16 are formed to be elongated in the longitudinal direction of the rubber crawler and to be offset back and forth. Preferably, such protrusions 15 and 16 of adjacent core metals 11 and 11 overlap (
D) Because of this overlap, the rolling wheels 17 are always on the top surfaces of the protrusions 15 and 16 during running, so vertical vibrations are reduced.

Now, as shown in the figure, the protrusions 15 and 16 are not only shifted back and forth, but in this example, the wing portion 1
2 and 13 also have a shape that is shifted in the direction in which the projections 15 and 16 are shifted, so that the wing portions 12 and 13 substantially exist in the projection area of the projections 15 and 16. ing.

In particular, as shown in FIG.
5, when running on the top surface of 16, the wheel 17 is in position A,
That is, when riding on the top surface of the protrusion 15, the weight of the aircraft is received at the tip of the protrusion 15 via the wheels 17, but the wing section 12 is directly below this tip, that is, in the projection area. Since this weight is supported by the wing section 12, the wing section 12 is hardly subjected to rotational force due to cantilever support, which occurs in conventional core metals. When the wheel 17 runs on the center part B of the core metal, of course no rotational force is generated, and then the wheel 17 is moved to the C position, that is, the top surface of the core metal located next away from the top surface of this protrusion 16. Even when attempting to move to position A, the presence of the wings 13 against the protrusion 16 hardly generates any rotational force on the wings, as explained in connection with the A position.

Although not shown in the drawings, the bottom surfaces of the wing portions 12 and 13 of the core metal of the present invention are preferably formed into gentle arcuate surfaces, and when chamfered, the sides are shifted back and forth. It is preferable to chamfer the bottom side slightly deeper than the opposite side. This chamfering depends on the size of the core metal, but the depth is about 0.2 to 3 mm on the side shifted back and forth, and the width is 10 to 30 m.
m, and on the other side, the depth is about 0 to 1 mm, and the width is 0 to 20 mm.
It is desirable to rub it by about mm. The reason why the bottom surfaces of the core metal wing parts 12 and 13 are formed in this way is to make it easier when winding around a sprocket or idler, and in particular, by shifting the core metal wings 12 and 13 back and forth, Gold 11
When considered as a single unit, the result is the same as if the wing section had been made wider, so it is desirable to devise some improvements to the bottom section.

FIG. 4 is a plan view showing a core metal 11 according to a second embodiment of the present invention, in which the wing portions 12 and 13 are made wider by this portion, corresponding to the shifted sides of the protrusions 15 and 16.
0. In this case, the wing parts 12 and 13 are formed symmetrically in a straight line left and right as in the conventional case, and projecting parts 120 and 130 are formed on the wing parts 12 and 13 by the amount that the projections 15 and 16 are shifted. It can be said that it is a thing.

FIG. 5 is a plan view showing a core bar 11 according to a third embodiment of the present invention, in which wing parts 12 and 13 are shifted in accordance with the shift of protrusions 15 and 16, and other parts remain as they were. The wings 12, 13 in their original position are curved 121, 131 relative to each other.
This is an example.

[0018]

[Effect] As described above, the present invention provides a wing portion in the projection area of the protrusion that is shifted forward and backward, which is the running wheel. The wing portion of the core bar embedded in the elastic body no longer generates rotational force, which not only improves the durability of the rubber crawler but also reduces vibrations to the occupants.

[Brief explanation of the drawing]

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

FIG. 2 is a side view of the core bar of FIG. 1;

FIG. 3 is a schematic side view showing the relationship between the core metal and the rolling wheels in FIG. 1;

FIG. 4 is a plan view of a second embodiment of the core metal of the present invention.

FIG. 5 is a plan view of a third embodiment of the core metal of the present invention.

FIG. 6 is a plan view of a conventional core metal.

FIG. 7 is a side view of the core bar of FIG. 6;

8] FIG. 8 is a schematic side view showing the relationship between the core metal and the rolling wheels in FIG. 6. [FIG.

[Explanation of symbols]

１１‥‥Core metal 12, 13... Wing section 120, 130... Overhanging part 121, 131...Curved part 14. Sprocket engagement part 15, 16...Protrusion 17.Rolling wheel

Claims (3)

[Claims] Claim 1: A wing part embedded in a rubber elastic body extending left and right, a sprocket engaging part located at the center thereof and arranged perpendicular to the longitudinal direction of the rubber crawler, and this engaging part A core metal of a rubber crawler consisting of a pair of protrusions that serve as running surfaces for sandwich wheels, the protrusions being elongated in the longitudinal direction of the rubber crawler, and arranged staggered back and forth. A core metal for a rubber crawler, characterized in that a wing portion is substantially formed on the projection plane of the projection. Claim 2: A wing part embedded in a rubber elastic body extending left and right, a sprocket engaging part located at the center thereof and arranged at right angles to the longitudinal direction of the rubber crawler, and this engaging part A core metal of a rubber crawler consisting of a pair of protrusions that serve as the running surface of the sandwich wheels. A core metal for a rubber crawler characterized by having left and right wing parts shifted back and forth to correspond to the protrusions. 3. The rubber crawler according to claim 2, wherein the bottom surface of the wing portion is chamfered at least on the side shifted forward and backward.
La core metal.