JPH0672362A - Rubber crawler - Google Patents

Abstract

PURPOSE:To provide a rubber crawler for use in the runner part of a vehicle, wherein the crawler is equipped with improved projections protruding at its inner surface. CONSTITUTION:Rubber lugs are formed at the peripheral surface of an endless resilient body of rubber, and projections 2 for transmission of the drive force or prevention of dislocation relative to rolling wheels are formed on the inner surface, and thus a rubber crawler 1 is accomplished, which is characterized by that a low friction member 3 is exposed at the projection 2 surface contacting other member. That is, the low friction member is exposed particularly at those projecting parts of the rubber crawler which contact and collide repeatedly with the members furnished on the machine body side. This reduces risk of detracking of wheels even though contacting and collision occur due to dislocation relative to the rolling wheels, which should minimize wear and breakage and decrease the running resistance to lead to remarkable enhancement of the lifetime of rubber crawler.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber crawler used in a running part of a vehicle, and more particularly to improvement of a protrusion protruding from an inner peripheral surface of the rubber crawler.

[0002]

2. Description of the Related Art Generally, a protrusion is continuously formed on the inner peripheral surface of a rubber crawler in the longitudinal direction thereof, and the protrusion is used for transmitting a driving force from a sprocket, or as a rolling wheel. Functioning as a prevention of disconnection. In particular, in order to prevent disengagement from the rolling wheels, if the rubber crawler receives a lateral force and a relative displacement occurs with the rolling wheels, the rolling wheels may come into contact with the protrusions. The collisions are repeated, and they try to restore this deviation to the original state. For this reason, frictional force is applied to the protrusions, the wheels come off from the rolling wheels, and further wear and damage occur.

25 to 26 show the inner peripheral surface of the rubber crawler 11 in such a state. FIG. 25 shows a shape in which a pair of protrusions 12 and 12 project from an endless rubber elastic body. The rolling wheel 20 normally rolls over the protrusions 12, 12, but when a deviation occurs between the rubber crawler 11 and the rolling wheel 20, the rolling wheel 20 is indicated by a dotted line (one side Contacting and colliding with the projections 12, 12 as shown in FIG. For this reason, a large frictional force is applied to the protrusions 12 and 12, especially on the outer side surfaces thereof, and derailment between the protrusions 12 and 12 is likely to occur, resulting in wear or damage in some cases.

On the other hand, FIG. 26 shows a rubber crawler in which a single projection 12 is projected. Again, when the rolling wheel 20 is displaced from the normal rolling position, the rolling wheel 20 and the projection 12 are also shown. As shown by the dotted line, contact and collision are repeated to prevent deviation.In this case as well, derailment with the rolling wheels easily occurs, and in some cases wear and damage may occur. Becomes Further, the protrusion 12 engages with a sprocket (not shown), and when the driving force is transmitted, the sprocket pin and the protrusion 12 always rub against each other. Therefore, the protrusion 12 is deformed especially at the root portion. Therefore, not only is there a tendency for derailment to occur with the rolling wheels, but also for easy wear or damage to this portion, especially when the projection 12 is made of rubber.

Further, when the rolling wheels 20 and the projections 12 come into contact with each other or collide with each other, a great running resistance is caused, resulting in energy loss.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional techniques.
The protrusion that protrudes on the inner peripheral surface of the la has a special structure to reduce the occurrence of derailment with the rolling wheel, and also to protect the protrusion from abrasion, deformation, damage, etc. Is.

[0007]

DISCLOSURE OF THE INVENTION As a result of intensive studies to achieve the above object, the present invention has been improved with the projection having the following structure. That is, the gist of the present invention is to form a rubber lug on the outer peripheral surface of the endless rubber elastic body,
A rubber crawler having a protrusion on the inner peripheral surface for transmitting a driving force or for preventing disengagement from a rolling wheel, wherein a low friction member is exposed on a contact surface of the protrusion with another member. The present invention relates to a rubber crawler characterized by the above.

When the protrusion is a rubber protrusion, it is preferable that the low friction member is set in a mold forming a rubber crawler, and then the rubber material is filled to form the low friction member as the protrusion. An integrally molded rubber crawler is provided.

[0009]

The present invention adopts the above-described structure, and in particular, it has a low friction on the surface of the projection which is always engaged with the rolling wheel and which is repeatedly contacted and collided with other members such as the rolling wheel. The member is exposed. Therefore, even in the case of controlling the deviation of the rolling wheels, in particular, the derailing property between the projections and the rolling wheels is improved, the abrasion of the projections is small, and the running resistance is small. It is a thing.

As such a low friction member, a ceramic material, a synthetic resin material or the like is selected. Among them, in consideration of weight saving, low cost, adhesiveness with rubber, etc., a member made of a high molecular weight polyethylene member is preferable. . Examples of the high molecular weight polyethylene include those of Mitsui Petrochemical Industry Co., Ltd. (trade name: Hi-Zex Million), and the average molecular weight is 1,000,000 or more, preferably 3,000,000 to 500.
It is a material that has excellent wear resistance, impact resistance, self-lubrication, and the like. This material is in the form of powder and can be easily pressed into a predetermined shape by press molding with a mold or the like.

[0011]

EXAMPLES The present invention will now be described in more detail based on examples. FIG. 1 is a first example of the rubber crawler of the present invention, showing a cross section in the width direction at the protrusion part of an example applied to the single protrusion 2 protruding from the inner peripheral surface of the rubber crawler 1.
Shows a cross section in the longitudinal direction of the protrusion of FIG. That is,
In the protrusion 2 protruding from the inner peripheral surface of the rubber crawler 1,
A sheet-shaped low friction member 3 ₁ is embedded toward the center thereof. The low-friction member 3 _1, sheet molded from causing high molecular weight polyethylene of the molecular weight of 3,000,000 - a preparative material, Gomukuro - set to the recessed portion corresponding to mold projections 2 for molding the La 1 It is integrally molded.

As can be seen in the figure, this sheet 3 ₁ is exposed on both side surfaces 4 and 5 and the top surface 6 of the projection 2, and the rolling wheel 20.
And unillustrated idler -, upon contact, collision with a sprocket or the like is intended to contact with these, shea - a low friction than the characteristic bets 3 _1, the derailing of between Accordingly focusing wheel reduction In addition, the wear resistance and the damage are small, and the self-lubricating property is good, so that the running resistance is remarkably reduced.

[0013] Figure 3 is an enlarged view of the projection part showing a modified example of the first example, in this case, the sheet - DOO 3 ₂ those exposed only to both sides 4,5 of the projections 2 is there.

In this way, the surface of the projection 2 is covered with the sheet 3
Whether exposing the ₁ be any design, FIG. 4 is a widthwise sectional view of the projection part showing another modification of the first example, shea - both sides of the bets 3 ₁ projections 2 4,5 This is the case when it is overhanging and exposed. Therefore, the rolling wheel or the like for contact or collide with the protrusion 2 is to exclusively overhangs - to contact the bets 3 _1, derailing resistance is improved, damage of the protrusion 2 becomes to be reduced.

In FIG. 4, the sheet 3 ₁ is not exposed on the top surface 6 of the protrusion 2, but it may be exposed on the top surface 6 as a matter of course. a plan view of the projection part showing a modified example, in particular be in the figure, overhanging sheet - DOO 3 ₁ U of protrusions 2 - Na - rubber 1 ₀ protrusions 2 the same quality in the section is padded Has been done.

FIG. 6 is a sectional view of a protrusion showing a second example of the present invention. In this example, the projection 2 is entirely covered with the cap-shaped low friction member 3 ₂ . This is also
Gomukuro - the position of the projection in the mold during molding of La, it is possible to integrate the projection 2 only by setting such a cap member 3 _2.

FIG. 7 shows the inner peripheral surface of the rubber crawler of the third example of the present invention, FIG. 8 is a cross section taken along the line AA of FIG. 7, and FIG. 9 is a cross section taken along the line BB of FIG. Is shown. In this example, the low-friction member 3 ₃ formed in a cross shape is integrated in the projection 2, and the side surface 4, 5 of the projection 2 and the front and rear surfaces 7, 8 have such a member 3 _3. The surface of is exposed. Of course, it may be exposed on the top surface 6. The protrusion 2 configured in this way is also effective in preventing abrasion and damage of the protrusion 2 when it comes into contact with the sprocket, as in the case of contact and collision with the wheel 20. This member 3 ₃
In this case, it is only necessary to set it in the mold, and in some cases, a low friction member divided into four parts may be used.

FIG. 10 is a plan view of a cored bar showing a fourth example of the present invention, in which the protrusions extending from the cored bar are divided into two halves 2 ₁ and 2 ₂ and a low friction member 3 ₄ is fitted therein from above. By embedding this in a rubber elastic body, the intended rubber crawler is obtained. Further, although not shown, a pin may be provided upright on the core metal so as to correspond to the protrusion, and a low friction member may be fitted to the pin to form a protrusion.

FIG. 11 is a rubber cross section showing a fifth embodiment of the present invention.
12 is an inner peripheral surface of the la, and FIG. 12 is a cross section in the width direction of FIG. In this example, both sides 4 and 5 of the protrusion 2 and the top surface 6
Over with applying this low friction member _35, and further extend this Gomukuro - to place the extension on the inner peripheral surface on the La is obtained by the rolling surface 9 of the rolling wheels, by rolling At the same time, the generation of rubber cracks is prevented.

In the above, each of the examples has been described with the case where there is only one protrusion protruding from the inner peripheral surface of the rubber crawler, but of course, the rubber crawler when a pair of protrusions as shown in FIG. 21 protrudes. Of course, when the protrusion is made of rubber, it is sufficient to embed a low-friction member in the protrusion to expose only the surface, and the protrusion is made of metal that extends beyond the core metal. If so, the purpose is achieved by adhering it to the metal surface or embedding it in rubber surrounding the metal.

FIG. 13 shows a sixth example of the present invention showing such an example, and is a partial cutaway sectional view in the width direction of the protrusion. In this case the projection 2 is the angular part 2 ₀ which extends from the metal core, this corner second outer surface of the ₀ low friction member 3 ₆ adhered advance, the more the rubber 1 ₂ surrounding the corner portion 2 ₀ It is an embedded base. In a rubber crawler having such a pair of protrusions, this member can be exposed on both inner and outer side surfaces of each of the protrusions, and the inner surface of the rubber crawler rolls as a measure when engaging with the sprocket. It is effective as a countermeasure against contact with the wheel.

14 to 17 show a seventh example of the present invention.
FIG. 14 is a plan view of the inner peripheral surface thereof, and FIG.
Is a plan view of the outer peripheral surface, and FIG. 16 is a cross section taken along line CC.
FIG. 17 and FIG. 17 are sectional views taken along the line D-D. In such an example
The protrusion 2 has a chevron shape in the longitudinal direction of the rubber crawler.
Low friction member 3₇ Is arranged. By this
The friction against the rolling wheels and the drive pin.
It will have a great effect. This low friction member 3₇ 
In that case, the one that is integrated before and after is as shown in Fig. 6 above.
Although similar, but especially considering the cost advantage,
Two plate-shaped low friction members 3₇₁Three₇₂Use
Insert this into the protruding part of the mold that forms the rubber crawler, and
It is better to form it. In this case, the top of the protrusion is
Two low friction members 3 ₇₁Three₇₂It becomes the contact part of.

The low friction member can be applied to other parts of the rubber crawler, for example, it can be applied to the rolling surface of the rolling wheel on the inner peripheral surface of the rubber crawler.
It is also possible to use this between a pair of protrusions.
In some cases, this low friction member can be used on the sprocket side.

FIG. 18 is a sectional view of a cored bar showing an example in which the present invention is applied to a cored bar. This example, between a pair of projections 2,2 extending from the core metal, sheet - be those to which the bets shaped member 3 _8, remarkable abrasion of parts according upon engagement with a sprocket (not shown) of the core metal It has been reduced. Then, on the member 3 ₈ is in terms rolling wheels in a so-called rolls, the effect is large due to the improved wear resistance.

[0024] Further, the present invention is also be applied to sprocket 19 is an example that shows a side view of adopting the low-friction member 3 ₉ to the sprocket, Figure 20 is a line E-E FIG. In the figure, the members 3 ₉ are provided on both sides of the portion corresponding to the engaging teeth. The low-friction member 3 ₉ fixation is not particularly limited, for example, is fixed by bolts or the like penetrating the left and right.

Further, FIG. 21 shows another sprocket 1
22 is a side view showing an example applied to 0, and FIG. 22 is a sectional view taken along line FF. In the illustrated one, a fitting groove (not shown) is formed in the center of the engaging tooth thereof, and a low friction member 3 ₁₀ is formed therein.
Are fitted together.

Further, FIG. 23 shows a sprocket 1 having another shape.
It is a partially cutaway front view showing an example applied to _{No. 0, in which} only the pin 10 _{1 used} for engagement with a protrusion (not shown) is constituted by this member 3 ₁₁ .

On the other hand, FIG. 24 is a partially cutaway sectional view of a case of applying the low-friction member 3 ₁₂ to the rotary wheel 20, Gomukuro - the inner peripheral surface of La on the outer peripheral surface 21 abutting the rotary wheel 20 The low friction member 3 ₁₂ is bonded and fixed.

[0028]

The present invention employs the above-mentioned structure, and exposes the low friction member in the protrusion portion where the contact and collision with the member of the rubber crawler, especially on the body side, is repeated. It will be. Therefore, even if a contact or collision occurs due to a deviation from the rolling wheels, the occurrence of derailment is reduced, wear and damage are minimized, and running resistance is also reduced. Was significantly improved.

[Brief description of drawings]

FIG. 1 is a first embodiment of the present invention, and is a cross-sectional view in the width direction of a protrusion part of an example applied to a single protrusion protruding from an inner peripheral surface of a rubber crawler.

FIG. 2 is a longitudinal sectional view of a protrusion of FIG.

FIG. 3 is an enlarged view of a protrusion showing a modification of the first example.

FIG. 4 is a cross-sectional view in a width direction of a protrusion showing still another modification of the first example.

FIG. 5 is a plan view of a protrusion showing a further modification of FIG.

FIG. 6 is a cross-sectional view of a protrusion, which is a second example of the present invention.

FIG. 7 is an inner peripheral surface of a rubber crawler showing a third example of the present invention.

8 is a cross-sectional view taken along the line AA of FIG.

9 is a sectional view taken along line BB of FIG.

FIG. 10 is a plan view of a cored bar showing a fourth example of the present invention.

FIG. 11 is an inner peripheral surface of a rubber crawler showing a fifth example of the present invention.

12 is a cross-sectional view in the width direction of FIG.

FIG. 13 is a partial cutaway sectional view in the width direction of the protrusion, which is a sixth example of the present invention.

FIG. 14 is a plan view of an inner peripheral surface of a rubber crawler showing a seventh example of the present invention.

FIG. 15 is a plan view of the outer peripheral surface of the rubber crawler of FIG.

16 is a sectional view taken along line CC of the rubber crawler of FIG.

FIG. 17 is a sectional view taken along line DD of the rubber crawler of FIG.

FIG. 18 is a sectional view of a cored bar showing an example in which the present invention is applied to the cored bar.

FIG. 19 is a side view showing an example in which the present invention is applied to a sprocket.

20 is a cross-sectional view taken along the line EE in FIG.

FIG. 21 is a side view showing another example in which the present invention is applied to a sprocket.

22 is a sectional view taken along line FF in FIG. 21.

FIG. 23 is a partially cutaway front view showing an example in which the present invention is applied to another sprocket.

FIG. 24 is a partially cutaway sectional view showing an example in which the present invention is applied to a rolling wheel.

FIG. 25 is an inner peripheral surface of a rubber crawler in a conventional pair of protrusions.

FIG. 26 is a rubber cross section of a conventional single protrusion.
It is the inner surface of LA.

[Explanation of symbols]

1, 11 ‥‥ Gomukuro - la, 1 _0, 1 ₁ ‥‥ rubber, 2, 12 ‥‥ projecting corner portion extending from the 2 ₀ ‥‥ metal core, 2 _1, 2 ₂ ‥‥ two split projections 3 ₁ 3 ₂ , 3 ₃ , 3 ₄ , 3 ₅ , 3 ₆ , 3 ₇ , 3 ₇₁ , 3
_{72, 3 8, 3 9,} 3 10, 3 11, 3 12 ‥‥ low friction member, 4, 5 ‥‥ both sides of the projection, the top surface of the 6 ‥‥ protrusions, 7, 8 ‥‥ front and rear surfaces of the projections, 9 rolling surface of ‥‥ track roller, 10 ‥‥ sprocket, 10 ₁ ‥‥ pin, 20 ‥‥ track roller.

Claims (2)

[Claims] 1. A rubber crawler comprising a rubber lug formed on an outer peripheral surface of an endless rubber elastic body, and a projection provided on an inner peripheral surface for transmitting a driving force or for preventing disengagement from a rolling wheel. ,
A low-friction member is exposed on a contact surface of the protrusion with another member, which is a rubber crawler. 2. The protrusion is a rubber protrusion, and the low friction member is set in a mold forming a rubber crawler, and then a rubber material is filled to integrally mold the low friction member with the protrusion. The rubber crawler according to the item.