JPH10236347A - Elastic crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent vertical deformation on both sides in the cross direction and prevent lowering of tractive force and breakage of the crawler main body by providing a cross-direction reinforcement body embedded corresponding to the lug projecting position of a crawler main body with a blade part projected along the cross-direction embedding region of a tensile body and an extended piece part projecting from the tip of the blade part. SOLUTION: A cross-direction reinforcement body 5 is so constructed that a main body part 8 is arranged in the cross-direction center part of a crawler main body 3, blade parts 9 are projected from both right and left sides of the main body part 8 along the cross-direction embedding region of a tensile body 4, and extended piece parts 10 are projected from the tips of the respective blade parts 9. The main body part 8 is provided with a projection 12 as a running support surface or the like for preventing falling-off of wheels and turning wheels. The extended piece part 10 is arranged toward a region to which the tensile body 4 is not extended in the cross- direction of the crawler main body 3, and the total length of the cross-direction reinforcement body 5 including both side tip parts occupies from 60% to 90% both inclusive to the width of the crawler main body 3. By this arrangement, the rigidity on both sides in the cross direction of the crawler main body is enlarged to prevent lowering of tractive force and breakage of the crawler main body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to civil engineering, construction,
The present invention relates to an elastic crawler used for a traveling device in a tracked vehicle for agricultural use or the like.

[0002]

2. Description of the Related Art An elastic crawler has an endless belt-shaped crawler body made of an elastic material such as rubber and a plurality of lugs integrally formed on an outer peripheral surface thereof at predetermined intervals. In addition, the circulating drive is performed by a meshing structure by a sprocket or friction transmission by a drum wheel.

[0003] In this elastic crawler, a tensile member made of steel cord or the like is embedded in the crawler body along the circumferential direction, and a predetermined distance is set in the circumferential direction on the non-ground side of the tensile member. Width-wise reinforcements (generally referred to as "core bars") are embedded at intervals. The width direction reinforcing body is made of metal (made of casting or sheet metal) or hard resin, and has a main body portion disposed at the center in the width direction of the crawler main body, and tensile members from both left and right sides of the main body portion. And a wing protruding along the width direction buried area of the main body. The main body is provided with a projection that protrudes to the non-ground side and is used as a wheel support surface or a running support surface of a wheel. .

By the way, in the case of this kind of elastic crawler, when the tensile strength of the tensile member is strengthened for the purpose of being applied to a heavy load or the like, the size of the crawler body in the width direction is increased. However, there has been a situation in which it is not desired to increase the size of the width direction reinforcing body due to the demand for weight reduction to prevent a decrease in running performance.

[0005] As a result, the width-direction reinforcing member sometimes occupies 40 to 60% of the width of the crawler body.

[0006]

In the conventional elastic crawler described above, the range in which the widthwise reinforcing member does not reach the crawler body is 60 to 40%. Both sides in the width direction were likely to jump upward in a wavy manner. For this reason, the traction force has been reduced, and the crawler body has been easily damaged.

[0007] If measures are taken to provide rubber projections on the non-contact surface side (endless inner surface side) in order to prevent the crawler main body from being vertically deformed on both sides in the width direction, it is said that the mud discharging action is reduced. It was supposed to introduce another problem. The present invention has been made in view of the above circumstances, and while preventing weight increase so as to lower the traveling performance,
An object of the present invention is to provide an elastic crawler capable of preventing vertical deformation of the crawler body on both sides in the width direction and preventing a decrease in traction force and damage to the crawler body.

[0008]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is, the elastic crawler according to the present invention has a wing portion in which a widthwise reinforcing member embedded corresponding to a lug projecting position of a crawler body projects along a widthwise embedment region of a tensile member; Has an extension piece protruding from the front end.

The extension piece has a smaller cross-sectional shape than that of the wing part, thereby achieving weight reduction. The cross-sectional shape refers to a shape when the wing portion or the extension piece portion is viewed in a state where the crawler body is viewed from the side (a state where the endless shape is viewed). As a means for reducing the cross-sectional shape of the extension piece portion, there is a method of making the crawler main body have a smaller planar dimension along the circumferential direction than the wing portion. For example, the extension piece may be formed in a bar shape, or its extension may be tapered in the projecting direction.

As another means for reducing the cross-sectional shape of the extension piece portion, there is a method of making the thickness dimension smaller than that of the wing portion. For example, the extension piece may be formed in a thin plate shape, or its thickness may be gradually reduced in the protruding direction. In addition, there is also a method in which the extension piece is formed, for example, in a flat plate shape continuous with the plane shape of the wing portion, and an opening, a notch, a recess, or the like penetrating in the thickness direction is formed in the plate surface of the extension piece. There is
These various methods can be appropriately combined.

[0011] If a position restricting piece for a tensile body protruding toward the ground side in the crawler body is provided at a connection portion between the wing portion and the extension piece, the extension piece and the tension body can be connected to each other. Can be prevented from interfering with each other in position, whereby deterioration and breakage of the crawler body and the tensile member, or mutual peeling thereof can be prevented. In addition, the positioning of the position regulating piece does not specify a strict position of straddling between both the wing portion and the extension piece portion, and does not correspond to the extension piece portion corresponding to the wing side. It also includes states and vice versa.

An elastic crawler having such a widthwise reinforcing member prevents the crawler body from becoming heavier enough to degrade running performance and prevents the crawler body from being vertically deformed on both sides in the widthwise direction, thereby providing a traction force. And the crawler body can be prevented from being damaged. In this case, the total length of the width direction reinforcing body including both the extension pieces can be formed to be 60% or more and 90% or less of the width dimension of the crawler body, and by doing so, the above-described effect is ensured. Can be withdrawn.

If the occupation ratio of the widthwise reinforcing member is less than 60%, it is the same as the conventional case. If it exceeds 90%, the interlayer bonding force at both ends in the widthwise direction of the crawler body becomes insufficient. May cause delamination.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of an elastic crawler 1 according to the present invention. The elastic crawler 1 includes an endless band-shaped crawler body 3 having lugs 2 projecting from the outer peripheral surface at predetermined intervals, and a steel cord or the like embedded in the crawler body 3 along the circumferential direction. It has a tensile member 4 and a widthwise reinforcing member 5 buried on the non-ground side of the tensile member 4 and corresponding to the projecting position of the lug 2.

The widthwise reinforcing member 5 includes a main body 8 disposed at the center of the crawler main body 3 in the width direction, and the left and right sides of the main body 8 along the widthwise buried area of the tensile member 4. Each of the wings 9 has a protruding wing 9 and an extension piece 10 protruding from the tip of each wing 9. In addition, the main body 8 is provided with a projection 12 that protrudes toward the non-ground side and is used as a wheel-preventing wheel, a running support surface of a wheel, or the like.

The extension piece portion 10 is arranged toward a region where the tension member 4 does not reach in the width direction of the crawler main body 3, and the entire length of the width direction reinforcing member 5 including the front end portions on both sides is as follows. 60% or more of the width of the crawler body 3 9
It is formed so as to occupy 0% or less. Therefore, the rigidity of the crawler body 3 on both sides in the width direction is strengthened, and even if this portion touches down during traveling, it does not jump upward in a wavy shape, thus preventing a decrease in traction force and damage to the crawler body 3. You can do it.

The extension piece 10 has a smaller cross-sectional shape than the wing 9 by making the plane dimension along the circumferential direction of the crawler body 3 smaller than that of the wing 9. . Therefore, the weight is reduced by this. The extension piece 10 has a tapered planar shape in the protruding direction and a gradually reduced thickness.

At a portion where the extension piece 10 is connected to the wing 9, an inner curve is formed so that stress concentration does not occur. The extension piece 10 can be formed integrally with the main body 8 and the wing 9 when they are made of the same material (metal such as casting or sheet metal or hard resin), or when they are made of the same material. When made of dissimilar materials, it may be joined by welding or the like as a separate body.

FIG. 4 shows a widthwise reinforcing member 5 used in the second embodiment of the elastic crawler 1 according to the present invention.
In the width direction reinforcing member 5, the extension piece portion 10 is formed in a single rod shape, whereby the cross-sectional shape with respect to the wing portion 9 is reduced in size and the weight is reduced. The cross-sectional shape of the extension piece 10 may be round or angular. It is also possible to form a hollow pipe.

The other constructions and functions and effects are substantially the same as those of the first embodiment, and a detailed description thereof will be omitted. FIG. 5 shows the width direction reinforcement 5 used in the third embodiment of the elastic crawler 1 according to the present invention. In the widthwise reinforcing member 5, the extension pieces 10 are formed as two parallel rods. Other configurations and operational effects are substantially the same as those of the second embodiment.

FIG. 6 shows a widthwise reinforcing member 5 used in a fourth embodiment of the elastic crawler 1 according to the present invention.
In the width direction reinforcing member 5, the extension piece portion 10 is formed in a flat plate shape that is continuous with the plane shape of the wing portion 9, and an opening 15 that penetrates the plate surface in the thickness direction is formed. Therefore, in the portion where the opening 15 is provided, the cross-sectional shape of the wing portion 9 is reduced in size, the weight is reduced, and the rubber is buried in the opening 15 to peel off. Will be prevented.

Other configurations, functions and effects are substantially the same as those of the above-described embodiments. Although not shown, the opening 15 may be formed as a concave portion opened on one side or both sides of the extension piece 10. FIG. 7 shows a widthwise reinforcing member 5 used in a fifth embodiment of the elastic crawler 1 according to the present invention.

In the width direction reinforcing member 5, the thickness of the extension piece 10 is formed smaller than that of the wing 9. Therefore, the cross-sectional shape of the wing portion 9 is reduced by the reduction in thickness, and the weight is reduced. Note that the extension piece 10 can be formed in a flat plate shape that is continuous with the plane shape of the wing portion 9, or the one shown in each of the above embodiments can be adopted.

The other structures, functions and effects are substantially the same as those of the above embodiments. FIG. 8 shows a sixth embodiment of the elastic crawler 1 according to the present invention. In the width direction reinforcing member 5 used in the sixth embodiment, a wing 9 and an extension piece 10 are provided. A position restricting piece 17 protrudes toward the ground side in the crawler body 3 with respect to the connection portion.

The position restricting piece 17 is positioned so as to sandwich the embedding position of the tensile member 4 on both sides in the width direction. Therefore, in the manufacturing process and the use stage of the elastic crawler 1, the displacement of the tensile member 4 in the width direction can be prevented, and the positional interference between the extension piece 10 and the tensile member 4 can be prevented. As a result, it is possible to prevent the crawler main body 3 and the tensile member 4 from being deteriorated or damaged, or from being separated from each other.

The extension piece 10 is the same as that described in each of the above embodiments. Incidentally, the present invention is not limited to the above embodiment. For example, in the width direction reinforcing body 5, the shape of the main body portion 8 and the wing portion 9, the presence or absence of the projection 12 with respect to the main body portion 8, its shape, material, and the like are not limited at all. Further, as for the shape and the like of the extension piece 10, those other than those shown in the above-described embodiments can be adopted.

[0027]

As is clear from the above description, in the elastic crawler according to the present invention, since the extension piece projects at the tip of the wing portion with respect to the widthwise reinforcing member, the widthwise direction of the crawler body is reduced. By preventing vertical deformation on both sides, it is possible to prevent a decrease in traction force and damage to the crawler body.

Moreover, since the extension piece has a smaller cross-sectional shape than the wings, it has the advantage that it is lighter and does not lead to a reduction in running performance. . Providing such a reduced weight extension piece also leads to an advantage that the cost can be reduced as compared with a case where the width direction reinforcing body is simply increased in size. By providing a position restricting piece for the tensile body at the connecting portion between the wing portion and the extension piece portion with respect to the width direction reinforcing body, it is possible to prevent positional interference between the extension piece portion and the tensile body, and thereby the crawler Deterioration and breakage of the main body and the tensile body, or mutual peeling thereof can also be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view showing a width direction reinforcing body used in a first embodiment.

FIG. 2 is a front sectional view showing a first embodiment of an elastic crawler according to the present invention.

FIG. 3 is a side sectional view showing a position corresponding to line AA in FIG. 2;

FIG. 4 is a plan view showing a width direction reinforcing body used for an elastic crawler according to a second embodiment.

FIG. 5 is a plan view showing a width direction reinforcing body used for an elastic crawler according to a third embodiment.

FIG. 6 is a plan view showing a widthwise reinforcing member used for an elastic crawler according to a fourth embodiment.

FIG. 7 is a front view showing a width direction reinforcing body used for an elastic crawler according to a fifth embodiment.

FIG. 8 is a front sectional view showing an elastic crawler according to a sixth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elastic crawler 2 Lug 3 Crawler main body 4 Tensile body 5 Width direction reinforcing body 8 Main body 9 Wing 10 Extension piece 17 Position control piece

Claims (5)

[Claims] An endless belt-shaped crawler body (3) having lugs (2) protruding at predetermined intervals on its outer peripheral surface, and is embedded in the crawler body (3) along the circumferential direction. A tension member (4), and a width direction reinforcing member (5) buried corresponding to the protruding position of the lug (2) on the non-ground side of the tension member (4); The directional reinforcing member (5) includes a main body (8) disposed at the center in the width direction of the crawler main body (3), and a width direction embedded region of the tensile body (4) from both left and right sides of the main body (8). A wing part (9) projecting along the wing part (9), and an extension piece part (10) projecting from the tip of the wing part (9) with a smaller cross-sectional shape than the wing part (9). An elastic crawler, characterized in that: 2. The cross-sectional shape of the extension piece (10) is reduced in size by making the plane dimension along the circumferential direction of the crawler body (3) smaller than that of the wing (9). The elastic crawler according to claim 1, wherein 3. The elastic crawler according to claim 1, wherein the extension piece (10) has a smaller cross-sectional shape by making the thickness dimension smaller than that of the wing (9). 4. A position control for a tensile body (4) projecting toward the ground side in the crawler body (3) at a connection portion between the wing (9) and the extension piece (10). 4. The elastic crawler according to claim 1, wherein a piece (17) is provided. 5. A width of the width direction reinforcing body (5) including both extension pieces (10) is formed to be 60% or more and 90% or less of a width dimension of the crawler body (3). The elastic crawler according to any one of claims 1 to 4, wherein