JP3321769B2 - Rubber crawler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel rubber crawler structure.

[0002]

2. Description of the Related Art In recent years, rubber crawlers have been widely used not only for agricultural machinery but also for construction machines and civil engineering machines. However, the rubber crawler has a structure that can be replaced with a conventionally used iron crawler. Therefore, the rubber crawler is not mounted and used under optimal conditions, so that when used in a machine having a large body weight, the rigidity of the rubber crawler is insufficient, and the rubber crawler has sufficient durability. Did not become.

[0003]

Generally, rubber crawlers are inferior in rigidity as compared with iron crawlers. Therefore, the rubber crawler has a drawback that the rubber crawler is easily detached from the wheels and sprockets after being mounted on the body. For this reason, it is conceivable to increase the rigidity by increasing the width of the wing portion of the cored bar. In this case, however, in the wrapped portion of the sprocket or idler, the rubber portion of the non-buried portion of the cored bar wing is deformed. Stress concentrates, and the fatigue of the rubber part impairs durability. Furthermore, since the rolling wheel moves up and down between the embedded portion and the non-embedded portion of the core metal, the occurrence of vibration is inevitable.

To improve the rigidity, it has been proposed to improve the rigidity by putting a rubber craw lug over the wings of the two metal cores as an improvement means (Japanese Patent Laid-Open No. 1-208284).
issue). However, also in this means, in the relationship between the lug portion and the non-lug portion, the width of the non-lug portion is significantly reduced, the winding resistance of the rubber portion in this portion is increased, and the distortion at the time of winding is reduced. Concentration is inevitable.

[0005]

Means for Solving the Problems The present invention has been intensively developed to solve the above-mentioned problems, and as a result, the following structure has been adopted to solve the problems. That is, the present invention provides a core metal having left and right wings embedded in an endless rubber elastic body and arranged side by side in the width direction at a constant pitch, and a rubber elastic body which surrounds the wings of the core metal. A sprocket hole formed by exposing the tensile body buried in the longitudinal direction of the core metal, aligning the center of the core with the width direction of the rubber elastic body, and forming the sprocket hole on the outer peripheral surface of the rubber elastic body. A rubber crawler consisting of a rubber lug and the left and right gaps formed by the adjacent metal core wings form a narrowed part on one side across the sprocket hole and a widened part on the other side The narrowed portion and the widened portion are alternately arranged in the longitudinal direction of the rubber elastic body. Preferably, the width on the narrowing side and the width on the expanding side of the two wings are:
It is a rubber crawler having a ratio of 2 to 1: 5.

[0006] In some cases, the wings of the adjacent metal cores are narrowed, and the hanging portions are respectively formed facing the outer peripheral side of the rubber crawler at the narrowed portion side, and the concave and convex engaging portions are formed at the opposed portions. The rubber wings may be provided, and the wings are provided with protruding pieces close to the inner peripheral side of the rubber crawlers, respectively. It may be a rubber crawler. Also, rubber lugs
It is preferable that the rubber lug be formed on the outer peripheral surface of the rubber crawler in correspondence with the wing of the metal core.

[0007]

In the rubber track according to the present invention, the wings of the metal core are alternately narrowed and widened on the left and right in the width direction of the rubber crawler. For this reason, the load from the rolling wheel rolling on the inner peripheral side of the rubber track is alternately applied to the left or right wing portion, and the left and right rolling wheels are not simultaneously rolled from the wing portion to the rubber portion. Therefore, the rolling of the rolling wheel becomes relatively smooth, and especially, by forming a rubber lug on the outer peripheral surface of the rubber crawler corresponding to the wing portion of the cored bar, the weight of the fuselage is received by the rubber lug, and the vibration is minimized. Is made possible.

The width (spacing) of the adjacent wings on the tight side and the width (spacing) of the flaring side are optimized. If the width is smaller than 1: 2, the rigidity of the rubber crawler is reduced. It will change alternately between the core metal part and the rubber part,
The vertical movement of the body, that is, the generation of vibrations to the operator becomes large, and the lug cannot be made too large, so that the weight of the body is concentrated on the lug portion and the durability is reduced. On the other hand, if this ratio is larger than 1: 5, the weight of the fuselage will be supported by the lugs because the lugs will be large, but on the other hand, the bending strain will concentrate on the rubber parts without lugs in the area around the sprocket. As a result, the durability as a rubber crawler is extremely reduced.

Particularly preferably, in the present invention, the lateral rigidity of the rubber crawler is increased by providing an engaging portion on the narrowed side of the wing portion for preventing the core bar from moving in the width direction. There is also a great feature that the rubber crawler can be prevented from twisting to exhibit the function of preventing wheel derailment.

[0010]

1 is a plan view of a rubber crawler according to the present invention, FIG.
FIG. 3 is a cross-sectional view taken along the line CC of FIG. 1 and FIG. In the figure, 10 and 20 are core metals, and 6
Reference numeral 1 denotes a rubber elastic body which constitutes a base of the rubber crawler.
6, 17, 26 and 27 are buried, and the metal cores 10 and 20 are arranged side by side at a constant pitch in the width direction of the rubber track. At the center of the rubber elastic body 61, cores 10, 2
The sprocket holes 62 are formed by exposing the central portions 11 and 21 of the O. 0. Sprocket teeth (not shown) fit into the sprocket holes 62. In other words, the central portions 11 and 12 of the cored bars are It becomes. And wing 1
A steel cord 63 as a tensile member is buried in the longitudinal direction of the rubber crawler, surrounding the outer peripheral sides of 6, 17, 26 and 27. 64 and 65 are rubber lugs provided on the outer peripheral side of the rubber elastic body 61.

In this example, the metal cores 10 and 20 are provided with wings 16 and
17, 26, 27 are inclined, and in the rubber elastic body 61, adjacent cores 10, 20 alternately narrow between left and right wings (69).
In the case of only 0 and 20, only one of the wings is narrowed, but the other is wide (68). When viewed from the side of the rubber crawler, the wings 16, 17, 26, and 27 of the metal cores 10, 20 are present in most parts, so that the rigidity of the rubber crawler is maintained. For this reason, the up-and-down movement of the rolling wheel (not shown) is also prevented.

A lug 6 formed on the outer peripheral surface of the rubber crawler
In this example, the lugs 64, 65 are formed along the wings 16, 17, 26, 27 of the metal cores 10, 20, and the outer ends of the lugs 64, 65 are on the narrower side of the wing. At 69, it is continued by bridging portions 66 and 67. Thus, lugs 64, 65 are provided on the entire surface of the cored bars 10, 20,
In addition, since it is continuous by the bridge portions 66 and 67,
The weight of the fuselage can be supported by the entire lug. Further, when the rubber crawler is viewed from the side, the lugs 64 and 65 and the bridge portions 66 and 67 are formed continuously, so that the rubber crawler can be supported in the lateral direction. Slippage is effectively prevented. That is, it has a large resistance to the lateral displacement of the rubber crawler, and also in this respect, it is effective against the derailing of the rubber crawler.

Further, the wing portions 16, 17, 2 of the metal cores 10, 20 are provided.
Since the widely open sides 68 and 27 are alternately provided on the left and right sides of the rubber crawler, the wide left and right rubber sections 68 mainly correspond to the bending stress in the course of winding. By particularly selecting the ratio of the width of the rubber portion 68 to the width of the rubber portion 69 on the narrower side of the wing portion, the bending strain is not concentrated on a part of the rubber, and the durability of the rubber crawler is reduced. The decline is as small as possible.

In order to make the bending stiffness as uniform as possible and to prevent the rubber from being greatly distorted, the portion 69 on the inner peripheral surface side of the rubber crawler, where the wings are narrowed, is relatively deep. A groove 70 is formed in the width direction of the rubber crawler,
Preferably, a shallow groove 71 is formed in the portion 68 where the wings are widened.

FIG. 4 is a diagram illustrating a core 1 of the rubber crawler shown in FIG.
FIG. 5 is an inner peripheral plan view showing only 0 and 20 and FIG. 5 is a side view thereof. The central portion 11 of the core 10 is formed as an engaging portion with a sprocket (not shown), and a pair of corners 12 and 13 are formed with the central portion 11 interposed therebetween. The corners 12 and 13 guide the sprocket, and rolling wheels (not shown) provided on the body roll on the top surfaces 14 and 15. Wings 16 and 17 are formed on the left and right sides of the central portion 11, respectively, and in this example, the wings 16 and 17 are inclined by 5 degrees in the rotation direction of the hands of the timepiece.

On the other hand, in the core bar 20 which is buried in the rubber elastic body adjacent to the core bar 10, the central portion 21, the corner portions 22, 23, and the top surfaces 24, 25 are in contact with the core bar 10. The same is true, with their wings 26, 27 inclined 5 degrees in the opposite direction to the hands of the clock. In this example, the corners 12 and 13 are oppositely protruded forward and backward, but the shape of the corners 12 and 13 does not matter in the present invention.

FIG. 6 is a modified example of the cored bars 10 and 20, and FIG. 7 is a sectional view taken along line AA of FIG. Core 10
The wings 16 and 17 have raised pieces 3 in the inclined direction, respectively.
1 and 32 are formed, while the wings 26 and 27 of the cored bar 20 are formed.
Are provided with integral raised pieces 33, 3 corresponding to the raised pieces 31, 32, respectively.
4 and 35, 36 are formed. Each of these raised pieces is raised on the inner peripheral side of the rubber crawler.
The raised pieces 33 and 34 are formed by sandwiching 1, and the raised pieces 35 and 36 are formed by sandwiching the raised piece 32. Raised piece 31
Are sandwiched between the raised pieces 33 and 34 and overlap each other when viewed from the side. For this reason, in the rubber track using the metal cores 10 and 20, even when external force is applied in the horizontal direction and the metal core is displaced in the horizontal direction,
The weight is prevented from deviating more than a certain amount. In such an example, one of the raised pieces is sandwiched between the other raised pieces, but the corresponding raised pieces are formed close to each other and overlapped when viewed from the side of the rubber crawler. The raised piece may be arranged.

FIG. 8 is a plan view showing a modification of the metal cores 10 and 20, and FIG. 9 is a sectional view taken along line BB in FIG. In this example, the wings 16 and 17 of the cored bar 10 are formed with hanging portions 41 and 42 toward the outer peripheral side of the rubber crawler, respectively, in the inclined direction, while the wings of the cored bar 20 are formed. 2
Similarly, hanging portions 43 and 44 are formed on the hanging portions 6 and 27 so as to face the hanging portions 41 and 42, respectively. A concave portion 45 and a convex portion 46 are formed in each of the opposed hanging portions, and these are fitted together.

When the cores 10 and 20 are embedded in the rubber elastic body, the fitting positions are substantially the same as or outside the embedding positions of the tensile members surrounding the cores 10 and 20. One. The fitting of the hanging portion serves as a stopper when the rubber crawler is reversely bent, and
This also prevents the core bars 10 and 20 from laterally shifting. In addition, the convex portion 46 for fitting may be a conical shape or a quadrangular pyramid shape, and the one concave portion 45 may be a depression that fits with the convex portion 46.

[0020]

As described above, the present invention adopts the above-described structure, so that in the case of a rubber crawler, the up and down movement of the rolling wheel is reduced.
It is characterized in that the vibration to the operator is reduced and the occurrence of side slip is also reduced, which leads to the improvement of the durability of the rubber crawler.

[Brief description of the drawings]

FIG. 1 is an inner peripheral plan view of a rubber crawler according to the present invention.

FIG. 2 is a cross-sectional view of the rubber crawler of FIG. 1 taken along line CC.

FIG. 3 is a plan view from the outer peripheral side of the rubber crawler of FIG. 1;

FIG. 4 is a rubber crawler core 10 shown in FIG. 1;
It is an inner circumference top view which took out only 20.

FIG. 5 is a side view of the cored bar of FIG. 4;

FIG. 6 is a plan view showing a modified example of the cored bar.

FIG. 7 is a sectional view of the core metal of FIG. 6 taken along the line AA.

FIG. 8 is a plan view showing a second modified example of the cored bar.

FIG. 9 is a cross-sectional view of the core metal of FIG. 8 taken along line BB.

[Explanation of symbols]

10, 20 ‥‥ core, 11, 21 ‥‥ core central part, 1
2, 13, 22, 23 ° corner, 14, 15, 24, 2
5 ° corner top, 16, 17, 26, 27 ° wings,
31, 32 ridges of wings 16, 17, 33, 34,
35, 36 ridges of wings 26, 27, 41, 41
{Drops of wings 16, 17; 43, 44} Wings 26,
27 hanging part, 45 ° hanging part concave part, 46 ° hanging part convex part, 61 ° rubber elastic body, 62 ° sprocket hole, 63 ° tensile body (steel code), 64 , 65 ‥
{Rubber lugs, 66, 67} Bridge section, 68} Rubber on the flared side, 69 # Rubber on the narrowed side of the wing, 77, 71 Grooves.

Claims (6)

(57) [Claims] 1. A core metal having left and right wings embedded in an endless rubber elastic body and arranged side by side in a width direction at a constant pitch, and a rubber elastic body which surrounds the wings of the core metal. A tensile body buried in the longitudinal direction, a sprocket hole formed by exposing the center part of the core metal to the width direction of the rubber elastic body and exposing the same, and a sprocket hole formed on the outer peripheral surface of the rubber elastic body. A rubber crawler comprising a rubber lug and a left and right gap formed by adjacent core metal wings forming a narrowed part on one side across a sprocket hole and a widened part on the other side. A rubber crawler, wherein the narrowed portions and the widened portions are alternately arranged in the longitudinal direction of the rubber elastic body. 2. The width of the two wings on the narrowing side and the widening side is 1: 2 to 1: 5 at the tip of the wing.
The rubber crawler according to claim 1, wherein 3. The method according to claim 1, wherein the wings of the adjacent metal cores are formed so as to face down to the outer peripheral side of the rubber crawler at the narrowing portion side, and the concave and convex engaging portions are formed at the facing portions. Item 1. Rubber crawler according to item 1. 4. A wing portion of an adjacent metal core is provided with a protruding piece on the narrowed portion side, each protruding toward the inner peripheral side of a rubber crawler, and these are overwrapped as viewed from the side. The rubber crawler according to claim 1. 5. The rubber clamp according to claim 1, wherein a rubber lug is formed on the outer peripheral surface of the rubber crawler corresponding to the wing portion of the cored bar.
La. 6. The rubber crawler according to claim 5, wherein the rubber lug is continuous on the narrowed side of the wing.