JPH072153A - Assembly type core for rubber crawler - Google Patents

Abstract

PURPOSE:To provide an increased life for a rubber crawler and to reduce its cost by a method wherein a bolt or a nut is disposed to the outside of a bolt through-part formed in a plate-form part, a bolt through-part is formed in a central member, and bolts are inserted in and joined in a screwed-in state with the two through-parts for integral formation. CONSTITUTION:The plate-form member 11 of a core 101 has wing parts 12 and 12 extended to the right and the left and the portion is embedded in a rubber resilient body 31 forming the main part of a rubber crawler. Meanwhile, a central member 21 integrally fixed to the plate-form member 11 has a pair of protrusions 22 formed at the right and the left of a central part. The protrusions are protruded from the inner peripheral surface 32 of the rubber resilient body 31 and a part nipped between the protrusions 22 formed on engaging parts each engaged with a sprocket. The plateform member 11 and the central member 21 are formed integrally in a way that bolts 41 are inserted through bolt through-parts 13 and 23 formed in the respective members and joined in a screwed in-state with respective nuts 42 arranged to the outside of the plate-form member 11. Thus, the core 1101 is easily replaced even when the central member 21 is broken owing to use.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core bar used in a rubber crawler used for running agricultural machinery and construction machinery, and particularly to an assembled core bar capable of coping with wear and damage of a core bar supporting a machine body. It is related to.

[0002]

2. Description of the Related Art In recent years, especially in construction machines and civil engineering work machines, rubber crochets have been used in place of conventional metal scrollers.
LA has come to be adopted. The feature of such a rubber crawler is that the entire ground contact surface side is made of a rubber elastic body, so that the concrete road surface is not damaged during running, and furthermore, the occupant can also be softened by the vibration input from the road surface. It is characterized by that it has become widely used.

In a general rubber crawler structure, a rubber elastic body is made endless and is wound around a drive wheel and an idler wheel of a machine body, and a lug for propulsive force is provided on the outer peripheral surface side thereof. Has been formed. The rubber elastic body is provided with sprocket holes at the center in the longitudinal direction corresponding to the sprocket teeth formed on the drive wheel, and a large number of horizontally arranged core bars are embedded between the sprocket holes. At the center of the core metal, the sprocket teeth are engaged and the driving force is transmitted. However, since metal contacts are repeated at the center, large wear occurs at this center and its vicinity. .

On the other hand, the projections protruding from the inner surface of the rubber elastic body sandwiching the central portion have the function of preventing the rubber crawler from coming off the machine body during traveling, and are particularly present in construction machines and civil engineering machines. In many cases, the wheels provided on the machine body often serve as a traveling surface traveling on the protrusions. For this reason, when these projections have irregularities on the road surface, or when the vehicle travels on the ground where pebbles and the like are scattered, an abnormal force received from the rolling wheels and drive wheels is applied. It was sometimes worn or damaged.

[0005]

For this reason, even if the rubber elastic body can still be used satisfactorily, due to the abrasion of the central portion of the core metal and the damage occurring in the protrusion and the vicinity thereof,
The entire rubber crawler had to be replaced, which was extremely uneconomical. Therefore, conventionally, a means of making the whole cored bar less likely to wear is taken, and generally, a high manganese steel is used, and a cored bar subjected to heat treatment and induction hardening is used, but the cost is high and the improvement is It was what was desired.

[0006] In view of such a current situation, the present applicant
In Japanese Patent Application No. 414197, there was provided a rubber crawler which can be partially replaced especially for abrasion or breakage of a core bar, and the present invention is a further improvement thereof. It is characterized in that the core bar used in the rubber crawler is an assembling type and the assembly is facilitated.

[0007]

The present invention has the following features to attain the object mentioned above. That is, a cored bar composed of a plate-like member embedded in a rubber elastic body, and a central member which is in contact with the plate-like member and serves as an engaging portion with sprocket teeth, wherein a bolt is attached to the plate-like member. A through hole is formed, bolts or nuts are arranged outside the through hole, and the through hole is aligned with the through hole to form a bolt through hole in the central member. The present invention provides an assembled core bar for a rubber crawler, characterized in that both members are integrally screwed together.

Particularly, it is an assembled core bar provided with a recessed portion into which the head of a bolt or a nut is fitted, on the outer side of the plate-like member, whereby the adhesive surface of the steel code is made flat. It is a thing. More preferably, a recessed portion into which the central member is fitted is provided on the surface of the plate-shaped member with which the central member contacts, or a concavo-convex fitting surface for fitting with each other is formed on the contact surface between the plate-shaped member and the central member. To do.

[0009]

In the present invention, the cored bar is composed of both a plate-shaped member and a central member, both of which are integrated by a nut on the plate-shaped member side and a bolt on the central member side. It is a thing. Then, generally, a recessed portion into which the nut is fitted is formed on the plate-shaped member side, and the nut is fitted therein.

However, normally, the plate member is mainly embedded in the rubber elastic body. Therefore, the nut is similarly embedded in the rubber elastic body, but the central member is not embedded in the rubber elastic body and the bolt itself is not embedded in the rubber. Therefore, when this core bar is used for a rubber crawler and the central member is damaged as a result, the central member is completely removed by unscrewing the bolt, and a new central member can be replaced here. Of.

In particular, since the plate member is formed with a recess into which the nut is fitted, the nut does not run idle even when the bolt is unscrewed or screwed, and the core metal is completely assembled. It is something that can be done. Of course, it is more preferable that the nut and the plate member are integrated by welding or the like.

On the other hand, the central member is fixed in contact with the plate-shaped member. In this case as well, the plate-shaped member is formed with a recess into which the central member fits, or a concavo-convex fitting surface is formed on the contact surface between the two. It is possible to reduce the force applied to the bolt effectively by these configurations.

A technique for forming a core by using a core as a plurality of members and integrating them is known, for example, from Japanese Utility Model Publication No. 54-9302 and Japanese Utility Model Publication No. 51-109005, but all of them are known. This core is inseparably welded for use, and the whole core is buried in the rubber elastic body. Originally, this core should be partially replaced after being supplied to the rubber crawler. Is not
It does not suggest the configuration of the present invention.

In general, for construction machines, the life of the machine is 60
Although it is about 00 hours, the life of the rubber crawler is 2
It is about 000 hours, and especially on a traveling road surface where sand or the like is bitten, the engaging portion of the core metal with the sprocket teeth is 500
After a long period of time, the wear becomes severe and it cannot be used. For this reason, the rubber elastic body constituting the rubber crawler can still be used, but it will be discarded due to the inconvenience of the cored bar, and the life as a rubber crawler was remarkably short. According to the invention, such worn parts and damaged parts can be easily replaced, and the life of the rubber crawlers can be remarkably extended, and the cost is low. Has come to be obtained.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings. 1 Gomukuro of the present invention - the first embodiment 10 ₁ of assembling the core metal for La was used, Gomukuro - it is a front view partially cut-away in the core metal portion of the La. And FIG. 2 shows the core 1
0 ₁ is a plan view showing only the central member, FIG. 3 is a front view of the central member, and FIG. 4 is a side view thereof. In the figure, reference numeral 11
Indicates a plate-shaped member of a core metal, which is a wing portion 1 extending to the left and right.
2 and 12, this portion is embedded in the rubber elastic body 31 which is the main body of the rubber crawler. On the other hand, the central member 21 integrally fixed to the plate-shaped member 11 has a pair of protrusions 22 formed on the left and right sides of the center, which protrude from the inner peripheral surface 32 of the rubber elastic body 31. The portion sandwiched by the protrusions 22 serves as an engaging portion with the sprocket teeth.

Now, the plate member 11 and the central member 21 are screwed with the nuts 42 arranged outside the plate member 11 by the bolts 41 penetrating the bolt penetrating portions 13 and 23 respectively provided therein. Are integrated by being done. At this time, the recessed portion 14 into which the nut 42 is fitted is attached to the plate-shaped member 11.
Is formed, and the nut 42 is fitted therein. In this example, one bolt penetrating portion 23 is provided on each of the left and right sides.

[0017] Particularly, in the core metal 10 of _the present invention, since the central member 21 is not embedded in the rubber elastic body, when such damage by using occurs, it is easy to replace only the central member 21 . Further, since the nut 42 is fitted in the recessed portion 14, the nut 42 does not protrude from the outer surface of the plate-shaped member 11. Therefore, the nut 42 surrounds the outside of the cored bar (plate-shaped member) and is made of rubber. There is an advantage that the contact with the steel code 51 embedded in the elastic body 31 is also eliminated. It goes without saying that the bolt 41 and the nut 42 may be provided in reverse.

The recessed portion 14 includes a bolt 41 and a nut 42.
The bolt 41 or the nut 42 does not rotate when they are screwed together, and usually has a hexagonal or rectangular shape according to the shape of the nut 42. That is, the recess 14 is the head of the bolt 41 or the nut 42.
It is better to prevent it from rotating (preventing idling) by being formed in conformity with the shape of FIG. 5 is applied to the case where the head of the bolt 41 or the nut 42 is square, and FIGS. 6 to 7 are the recesses 14 applied when these are hexagonal.
In this case, the regular hexagonal concave portion 14 is controlled so that the head of the bolt 41 or the facing surface of the nut 42 is controlled and prevented from rotating in FIG. Although not shown, the bolt penetrating portions 13 and 23 may be grooves cut from both ends of the respective members 11 and 21, and the same goes for the recessed portion 14 into which the nut 42 is fitted.

As described above, when the core bar used in the rubber crawler is divided into a plurality of parts, the properties required for each part of the core bar, such as wear resistance and corrosion resistance, are particularly excellent. The material can be used, and even if the cored bar is partially damaged, replacement and repair can be facilitated, and the durability of the rubber crawler can be improved.

[0020] Incidentally, the projections 22 of the metal core 10 of _the present invention will become rolling surface of rolling wheel mounted on the body side, or those having a Datsuwa prevention function is not particularly limited to this shape In the above-mentioned example, the projection 22 is a corner portion which is fitted into the rolling surface 22 ₁ of the rolling wheel attached to the machine body and the recess 22 ₂ formed under the rolling surface 22 ₁ in order. 22 ₃
This is an example consisting of and, which are arranged in a staggered pattern on the left and right. As will be described later, this has the ability to reduce vibrations to the operator and to prevent twisting of the cored bars 10 ₁ and 10 ₁ embedded in the rubber elastic body 31. In the figure, in order to reinforce the protrusion 22, the hem portion 22 ₄ is projected to the left and right.

[0021] Figure 8 is a core metal 10 _first central member 21 of the present invention
It is a side view which shows the winding state with the sprocket or the idler 60. As shown in this figure, the protrusion 22
The recesses 22 ₂ and the corners 22 ₃ formed at the corners are fitted in a very smooth manner, and the two fit together according to the radius of curvature of the sprocket or idler 60. Therefore, the steel cord 51 is An unnecessary tensile force is not applied, vibrations at the time of winding can be reduced, and the durability performance of the rubber crawler is significantly improved.

FIG. 9 shows a second embodiment of the cored bar 10 ₂ of the present invention, in which a recessed portion 15 into which the central member 21 is fitted is formed in the plate-shaped member 11, and the central member 21 is fitted therein to form the bolt 41. The nut 42 and the nut 42 are screwed together to be integrated with each other. This example is characterized in that the force acting on the bolt 41 that integrates the two is effectively reduced.

In the embodiment using each cored bar as described above, when the cored bar is embedded in rubber to form a rubber crawler, that is, in a rubber crawler to which one kind of such cored bar is applied. Of course, it will be a characteristic rubber crawler,
In some cases, there is a problem in that the rubber roller is directional with respect to torsion. Further referring to this point, FIGS. 10 and 11 show rolling surfaces 22 ₁ , depressions 22 ₂ and corners ₂ of the protrusions 22 of the central member 21, particularly of the adjacent cores.
But shows a 2 ₃ relationship, for twisting force in a clockwise direction as shown in FIG. 10, but twisting is easier than interfere counteract thereof and the projection 22, as shown in FIG. 11 The counterclockwise twisting force does not cause the rubber crawler to twist. This means that the protrusion 22 has a depression 22 ₂ ,
The same applies to the case where the corners 22 _{3 and the} like are not formed, and in such a case, it is normal that a sufficient stopping force against twisting to either side is not exhibited.

The above case occurs when one type of cored bar embedded in the rubber crawler is used, but if two types of cored bar having protrusions of a specific shape are used and these cores are alternately used,
It has been found that the twisting force of the rubber crawlers is effectively blocked. 12 to 15 of the third embodiment of the assembled core metal 10 ₃ of the present invention, which shows only the central member 21, 12-14 (hereinafter referred to as A type) one kind of them
12 is a plan view, FIG. 13 is a front view, and FIG. 14 is a side view taken along the line AA. FIG. 15 is a plan view of another type of central member 21 (hereinafter referred to as B type).

Now, the protrusions 22 of the central member 21 of the core metal 10 ₃ of this embodiment will be described. The protrusions 22 ₆ mainly controlling the rolling surface 22 ₁ and the protrusions 22 mainly controlling the corners 22 _3.
8 and ₈ are arranged on the right and left sides. The A type has a protrusion 22 ₆ controlling the rolling surface 22 ₁ on the right side, and the B type has a protrusion 22 ₆ controlling the rolling surface 22 ₁ on the left side. It is alternately embedded in the rubber elastic body 31 to form a rubber crawler. Of course, in the projection 22 ₆ , depressions 22 ₂ are alternately formed in the portion of the rolling surface 22 ₁ that bulges out of the wing portion 12 of the core metal, and the corner portions 22 ₃ are set as the fitting portions. On the other hand, in the projection 22 ₆ , the corner portion 22 ₃ is bulged from the wing portion 12 of the cored bar corresponding to the depression 22 ₂ . The central top surface of the protrusion 22 ₆ also serves as the rolling surface of the rolling wheel.

In other words, the protrusions 22 are arranged in a zigzag pattern on the left and right.
Core metal 10 using the central member 21 in which ₆ and 22 ₈ are arranged
₃ are alternately embedded in the rubber crawler. Therefore, the projection 22 of the core 10 ₃ adjacent will ensure that they do not interfere in the left and right alternately, Gomukuro - a great feature that prevents the hand twisting force La results.

[0027]

According to the present invention, since the central portion of the core bar of the rubber crawler is abraded especially by the engaging friction with the sprocket teeth, the central part of the core bar can be replaced with a bolt. If the core metal is worn or damaged, it can be replaced, and the life as a rubber crawler will be remarkably extended, and only such a central member should be a member with excellent wear resistance performance. It will be good.

[Brief description of drawings]

FIG. 1 is a first part of an assembled core bar for a rubber crawler of the present invention.
FIG. 3 is a partially cutaway front view of a core bar of a rubber crawler using an example.

FIG. 2 is a plan view showing only a central member of the cored bar shown in FIG.

FIG. 3 is a front view of the central member of FIG.

FIG. 4 is a side view of the central member of FIG.

FIG. 5 is a plan view showing an example of a recess formed in a plate-shaped member of a cored bar.

FIG. 6 is a plan view showing another example of a recess formed in a plate-shaped member of a cored bar.

FIG. 7 is a plan view showing still another example of the recessed portion formed in the plate-shaped member of the cored bar.

FIG. 8 is a view showing a state in which the cored bar of the present invention is wound around a sprocket or an idler, and is a side view showing the state particularly with a central member of the cored bar.

FIG. 9 is a partially cutaway front view showing a second embodiment of the cored bar of the present invention.

FIG. 10 shows the relationship between the rolling surface 22 ₁ , the depression 22 ₂ , and the corner portion 22 ₃ of the protrusion 22 of the central member 21 of the adjacent core metal, particularly in the clockwise direction with respect to the rubber crawler. It is explanatory drawing with respect to the twisting force of a direction.

FIG. 11 is a view similar to FIG. 10, but is an explanatory view for a twisting force in a counterclockwise direction particularly with respect to a rubber crawler.

FIG. 12 shows only the central member of the third embodiment of the assembling cored bar of the present invention, and is a plan view of the central member of the A type cored bar.

FIG. 13 is a front view of the A-type core bar shown in FIG.

FIG. 14 is a view of A of the A type core bar shown in FIG.
It is a side sectional view in the A line.

FIG. 15 is a plan view of a central member of a B type core bar of a third embodiment of the assembling core bar of the present invention.

[Explanation of symbols]

10 ₁ , 10 ₂ , 10 ₃・ ・ ・ Core metal, 11 ・ ・ ・ Plate-shaped member constituting the core, 12 ・ ・ ・ Wing of plate-shaped member, 13 ・ ・ ・ Bolt penetration part of plate-shaped member, 14 ・ ・ ・ Nut Recessed part of plate-shaped member into which is fitted 15: Recessed part of plate-shaped member into which center member is fitted 21 ... Central member constituting core bar, 22, 22 ₆ , 22 ₈ ... Protrusion, 22 ₁・ ・ ・ Rolling surface 22 ₂・ ・ ・ Dimples 22 ₃・ ・ ・ Corners 22 ₄・ ・ ・ hem part 23 ・ ・ ・ Center member bolt penetration part 31 ・ ・ ・ Rubber elastic body that forms the base of the rubber crawler 32 ・ ・ ・ Rubber elasticity Inner peripheral surface of the body, 41, bolt, 42, nut, 51, steel code, 60, sprocket or idler.

Claims (4)

[Claims] 1. A plate-shaped member embedded in a rubber elastic body,
A core metal consisting of a central member that is in contact with the plate-shaped member and serves as an engaging portion with sprocket teeth, and forms a bolt penetrating portion in the plate-shaped member, and a bolt or a bolt outside the penetrating portion. A nut is disposed, a bolt penetration portion is formed in the central member so as to match the penetration portion, and bolts are penetrated and screwed into both bolt penetration portions so that both members are screwed and integrated. Assembled core bar for rubber crawlers. 2. The assembly core bar for a rubber crawler according to claim 1, wherein a recessed portion into which a bolt head or a nut is fitted is provided on the outside of the plate-shaped member, and the steel cord bonding surface is made flat. . 3. The rubber claw according to claim 1, wherein a recessed portion into which the central member is fitted is provided inside the plate-shaped member.
Assembly core metal for la. 4. The assembled core bar for a rubber crawler according to claim 1, wherein an uneven fitting surface for fitting with each other is formed on a contact surface between the plate member and the central member.