JPH08119162A - Crawler belt rubber pad - Google Patents

Abstract

PURPOSE: To tread ground mainly with the central part of a block so as to reduce turning resistance, reduce jump-up of a vehicle body such as pitching, and reduce development of irregular abrasion of the end part of the rubber block and of crack fracture of the rubber block. CONSTITUTION: A crawler belt rubber pad is constituted from a long track shoe and a rubber block vulcanized and adhered to the outer surface side, thickness of the rubber block is set to thinner toward its end in the longitudinal and/or lateral direction of the stock shoe, and the rubber block surface is divided into two, a central area and a circumferencial area. The track shoe 1, the rubber block 2, thickness h1 of the central part, thickness h2 of the end part, the outer surface curvature R1 , the central area S0 , and the circumferencial area S1 are shown respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a crawler belt rubber pad used in a traveling portion of a construction machine or a civil engineering work machine.

[0002]

2. Description of the Related Art In recent years, crawler rubber pads have been used in place of iron shoes in running parts of construction machines and the like.
This crawler belt rubber pad has a rubber block vulcanized and bonded to the crawler plate so that it will not be damaged even when traveling on a paved road surface,
Further, it has been adopted widely in recent years because it has a merit of reducing vibrations to the operator.

[0003]

However, in a usual crawler belt rubber pad, a rubber block is vulcanized and adhered to a track plate having a glosser on the outer surface, and the entire outer surface of the rubber block is flat. It is formed as a surface. Therefore, the contact area with the traveling surface is large, and the resistance when turning is particularly large. Then, especially on a road surface having a large friction coefficient such as a concrete road surface or an asphalt road surface, a phenomenon called so-called pitching causes the body to fly due to this resistance. In addition, since the outer surface of the track plate is usually provided with a glosser, the weight of the machine body on the rubber block is rather unbalanced, which causes cracks in the rubber block and resistance during turning. Therefore, it has been pointed out that the edge of the rubber block is likely to be damaged and the life of the rubber track pad is short.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and provides a crawler rubber pad having low turning resistance and improved durability. That is, the gist of the present invention is to provide a long shoe plate,
A crawler belt rubber pad consisting of a rubber block vulcanized and adhered to the outer surface side, wherein the thickness of the rubber block is made thinner toward the end thereof in the longitudinal direction and / or the width direction of the shoe plate, The crawler belt rubber pad is characterized in that the surface of the rubber block is divided into a central region and a peripheral region.

A rubber track pad having an outer surface of the rubber block defined by one or more straight lines and / or curved lines, preferably, the track plate to be used in the longitudinal direction thereof. In the right-angled cross section, it is preferable that the ground side of the cross section is straight.

[0006]

According to the present invention, the outer surface shape of the crawler belt rubber pad is specified to reduce the thickness of the circumference of the rubber block. In other words, in the normal use state, the center area of the crawler belt rubber pad is mainly the running surface. And the peripheral edge portion, that is, the peripheral region, is a non-contact portion. Therefore, at the time of turning, it turns around the center region of the crawler belt rubber pad, which reduces the turning resistance and enables smooth rotation. That is, on the road surface where the aircraft does not sink such as concrete road surface and asphalt road surface,
Even if the peripheral area of the crawler belt rubber pad is not grounded, and even if it is grounded, the surface pressure in the central area is high, which makes it easier to turn. On the other hand, on the running surface where the vehicle body sinks, the peripheral area of the rubber block is also grounded to disperse the weight of the vehicle body to prevent the vehicle body from sinking and also to provide a driving force.

As a result of earnestly analyzing the durability of the rubber block, the durability is obtained if there is no unevenness represented by a glosser or the like in the longitudinal direction of the outer surface of the shoe plate, that is, at right angles to the running direction. Based on the knowledge that the improvement of the load, it is possible to reduce the load due to the weight of the aircraft by using a track whose cross section is perpendicular to the longitudinal direction of the track and the side of the cross-section is on the ground plane side. The particles are evenly distributed to prevent the load from being concentrated on the rubber block, and the durability is improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The crawler belt rubber pad of the present invention will be described below in more detail with reference to the drawings. 1 is a plan view of the inside of a crawler belt rubber pad according to a first embodiment of the present invention, FIG. 2 is a plan view of the outside of the track rubber pad of FIG. 1, FIG. 3 is a sectional view taken along line AA of FIG. 1, and FIG. It is sectional drawing in the BB line of FIG. In the figure, 1 is a rectangular metal track plate, and the outer surface of the rubber block which is vulcanized and bonded is a flat surface. That is, in the cross section perpendicular to the longitudinal direction of the track plate, the outer surface of the cross section is flat, and 2 is a rubber block vulcanized and bonded to the outer surface side of the track plate 1. Is. In this example, the rubber block 2 is vulcanized and adhered to the inner surface side in the longitudinal direction of the shoe plate 1 to prevent the rubber block 2 from peeling off.

The outer surface of the rubber block 2 in the longitudinal direction of the shoe plate 1 is formed by one curved surface R ₁ .
The central region S ₀ where the center of the rubber block 2 is thickest h ₁
Then, the thickness h ₂ becomes a peripheral region S _{1 in} which the thickness h ₂ is gradually reduced toward the end. Further, the outer surface of the rubber block 2 in the width direction of the track plate 1 is also formed by one curved surface R ₂ , and the center is thick (h ₁ ) and the end portions are thin (h ₂ ) as described above. ing. In the figure, 3 is a bolt hole formed in the shoe plate 1, and 4 is a bolt hole formed in the rubber block 2.
Although not shown, it is a matter of course that the outer surface of the rubber block 2 may be formed by a plurality of curved surfaces.

In the crawler belt rubber pad according to the first embodiment, as shown in FIG. 5, the central area S _{0 of the} rubber block 2, that is, the thickness h ₁ of the rubber block 2 is large with respect to the normal traveling surface P. The part is grounded, and its peripheral area S ₁
That is, the h ₂ portion of the rubber block 2 having a small thickness is not grounded. Therefore, at the time of turning, the turning resistance is significantly reduced because it is turning due to the contact resistance between the central area S ₀ and the traveling surface P. Moreover, since the rubber block 2 in the peripheral area S ₁ does not normally contact the running surface P, the rubber block 2 is less likely to be cracked or damaged, and the durability of the crawler belt rubber pad is significantly improved. It became what was done.

Generally, a surface of the shoe plate 1 has a grouser extending in its longitudinal direction, which causes uneven load on the rubber block 2 during running, and by repeating this, the rubber block is repeated. Although the durability of No. 2 was remarkably reduced, the track plate 1 of the present invention has no glosser on the outer surface, and since this portion is flat, it is against the rubber block 2 during running. Since the load is applied almost uniformly, the durability is further improved.

In the crawler belt rubber pad of the present invention, FIG.
As shown in, even if the thickness h _{3 of the} portion including the bolt insertion hole 4 of the rubber block 2 is made slightly lower from the viewpoint of protecting the head of the bolt, the substantial effect does not change.

FIG. 7 is a side view in the longitudinal direction of the second embodiment of the crawler belt rubber pad of the present invention, and FIG. 8 is a side view in the width direction.
In this example, the peripheral area S ₁ (edge) of the rubber block 2 is formed by the inclined surfaces L ₁ and L ₂ , and the rubber block 2 is thin (h ₂ ) by that amount. The angle θ of the inclined surface is preferably 25 to 55 degrees. Further, although not illustrated, thin h ₂ of the peripheral area of the rubber blocks 2 (end) may be constituted by a plurality of inclined surfaces, the peripheral area of the rubber blocks 2 of the combination of a curved surface and the inclined surface the Of course, it may be formed with.

[0014]

Since the crawler belt rubber pad of the present invention has the structure of the rubber block as described above, the central area of the rubber block is mainly grounded with respect to the running surface, and the turning resistance is small even when the machine body turns, The flight of the body such as pitching is also eliminated. In addition, since the peripheral area (end) of the rubber block is not grounded, uneven wear of the end of the rubber block and crack breakage of the rubber block, which are likely to occur due to ground contact with the running surface, are reduced. It also improves the durability as a rubber pad.

[Brief description of drawings]

FIG. 1 is an inner plan view of a crawler belt rubber pad according to a first embodiment of the present invention.

2 is a plan view of an outer side of the shoe rubber pad of FIG. 1. FIG.

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is a conceptual diagram showing a contact state of the crawler belt rubber pad shown in FIG. 1 with a traveling surface during traveling.

6 is a modification of the crawler belt rubber pad shown in FIG.

FIG. 7 is a longitudinal side view of a crawler belt rubber pad according to a second embodiment of the present invention.

8 is a side view in the width direction of the crawler belt rubber pad of FIG. 7.

[Explanation of symbols]

1 ‥‥ track shoe, 2 ‥‥ rubber block, 3 ‥‥ track shoe in drilled bolt holes, 4 ‥‥ bolt drilled into the rubber block, the thickness of the thick portion of the center of h ₁ ‥‥ rubber block, h ₂・ ・ ・ Thickness of rubber block end, L ₁ , L ₂・ ・ ・ Outer surface of rubber block Inclined surface, P ・ ・ ・ Travel surface, R ₁ , R ₂・ ・ ・ Outer surface curved surface of rubber block, S ₀ The central area of the rubber block, S ₁ The peripheral area of the rubber block.

Claims (3)

[Claims] 1. A crawler belt rubber pad comprising a long shoe plate and a rubber block vulcanized and bonded to the outer surface of the shoe block, wherein the rubber block of the rubber block is arranged in the longitudinal direction and / or the width direction of the shoe plate. A crawler belt rubber pad, wherein the rubber block surface is divided into a central region and a peripheral region, the thickness of which is reduced toward the end thereof. 2. The track rubber pad according to claim 1, wherein the outer surface of the rubber block is defined by one or more straight lines and / or curved lines. 3. The crawler belt rubber pad according to claim 1, wherein in a cross section perpendicular to the lengthwise direction of the crawler plate, the side of the cross section on the ground contact side is a straight line.