JP4447690B2 - Rubber crawler - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rubber crawler, and more particularly to a coreless rubber crawler in which a main cord and a bias cord are embedded.
[0002]
[Prior art]
Normally, a rubber crawler without a cored bar is constructed by embedding a main cord having a circumferential cord angle in a rubber body having an endless belt shape and a bias cord for reinforcing the torsional stiffness and lateral stiffness by reinforcing the cord. Has been.
As shown in FIGS. 6 (A) and 6 (C), in this type of rubber crawler 21, a main cord 24 having a circumferential cord angle is embedded on a substantially center line in the thickness direction within an endless belt-like rubber body. Bias cords 25 and 26 having mutually opposite cord angles (usually 45 °, see FIG. 6B) for reinforcing the torsional rigidity and lateral rigidity are sequentially arranged on the ground side (FIG. 6C). It is laminated and embedded in the upper side).
However, normally, as shown in FIG. 6A, when the rubber crawler 21 is wound around the driving roller 10 (or the driven roller), a tensile force acts on the outer peripheral side of the center line, A compressive force acts on the circumferential side. Moreover, the magnitude of these forces increases as the distance from the center line increases. For this reason, when the pair of bias cords 25 and 26 having cord angles opposite to each other at substantially the same angle as described above are stacked, the bias cord 26 on the outer peripheral side which is the ground side has a larger tension. The force T acts, and a torsional force F that is a shearing force due to the cord angle of the bias cord 26 is generated as shown in FIG. Therefore, the rubber crawler is twisted due to the difference in shearing force caused by the difference in the inner and outer peripheral positions due to the lamination of the bias cord, and the straight running performance is deteriorated.
[0003]
Therefore, an endless belt disclosed in Japanese Patent Publication No. 7-41848 shown in FIG. 7 has been proposed.
In the belt main body 49, the first ply 72 having a cord angle in the circumferential direction, the second ply 74 having a cord angle of 45 ° laminated on the outer peripheral side thereof, and further laminated on the outer peripheral side thereof. The third ply 76 having a minus 60 ° cord angle is embedded. Reference numeral 78 denotes an orthogonal cord (orthogonal to the cord of the first ply 72) laminated on the outer peripheral side of the third ply 76.
With this configuration, the cord angle of the third ply 76 stacked on the outer peripheral side is set to minus 60 ° with respect to the cord angle of 45 ° in the second ply 74 that normally generates the maximum torsional force. Therefore, the torsional force due to the large tensile force generated in the third ply 76 because it is laminated on the outer peripheral side is to be reduced.
[0004]
[Problems to be solved by the invention]
However, the attempt to reduce the twisting force caused by the tensile force between the plurality of bias cords stacked on the inner and outer peripheries by changing the cord angles to each other reduces the twist of the rubber crawler. Although the straight running performance is improved, two layers of the second ply and the third ply are required on the inner and outer circumferences at the minimum, so that the weight of the entire rubber crawler is increased and the driving roller of the rubber crawler In addition, the winding rigidity of the driven roller is increased and the running resistance is increased.
[0005]
Therefore, the present invention solves the problems of the conventional rubber crawler, and can dispose a bias cord that can suppress the occurrence of torsion and improve the lateral rigidity without increasing the weight or winding rigidity around the roller. An object is to provide a rubber crawler.
[0006]
[Means for Solving the Problems]
Therefore, the present invention is a combination of a plurality of cords having cord angles opposite to each other in the same plane in an endless belt-shaped coreless rubber crawler in which a main cord having a circumferential cord angle is embedded. A bias cord composed of two cords having substantially the same width in one layer is laminated on the main cord, and the bias cord is formed by alternately arranging even numbers of cords having cord angles opposite to each other. Among the plurality of cords constituting the bias cord, the sum of the widths of the cords having a predetermined cord angle and the sum of the widths of the cords having a cord angle opposite to the predetermined cord angle are made equal to each other. Another cord is disposed on the outer peripheral side of the abutting portion of the adjacent cords having the opposite cord angle .
Further, the present invention is configured by combining a plurality of cords having cord angles opposite to each other in the same plane in an endless belt-shaped coreless rubber crawler in which a main cord having a circumferential cord angle is embedded. A bias cord composed of two cords having substantially the same width in one layer is laminated on the main cord, and the bias cord is configured by alternately arranging even numbers of cords having cord angles opposite to each other. , wherein the plurality of codes constituting the bias cord, is equal to the total width of the code having a total of a cord angle of said predetermined cord angle in the opposite direction from the width of the code having a predetermined cord angle, each other physician that overlapped the edge of one of the code at the abutting portions of adjacent codes with a cord angle in the opposite direction characterized in, the this It is an unit for al the problem solution.
[0007]
Embodiment
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a view showing a reference example of the rubber crawler of the present invention, FIG. 1 (A) is a cross-sectional view of the rubber crawler, and FIG. 1 (B) is a view as seen from an arrow A in FIG. 1 (A).
As shown in FIG. 1 (A), the rubber crawler 1 of the present invention has a large number of guide projections 2 of the roller wheels protruding at predetermined intervals in the circumferential direction along the center on the inner peripheral side (upward in the drawing). The main cord 1 and the bias cords 5 and 6 are embedded in a rubber body in which a large number of ground lugs 3 that are inclined in the transverse direction are protruded at predetermined intervals in the circumferential direction on the ground contact portion on the outer peripheral side. .
The present invention is characterized in that one layer bias cord configured by combining a plurality of codes having a cord angle in opposite directions to each other in the same plane is stacked in the main code, the present embodiment As shown in FIG. 1 (B), which is a view taken in the direction of arrow A of FIG. 1 (A), the main cord 4 embedded on the center line in the thickness direction of the rubber crawler 1 has a circumferential cord angle. The first bias cord 5 and the second bias cord 6 stacked on the ground side of the main cord 4 have cord angles opposite to each other in the same plane, and the width W1 of one bias cord 5 and the other The width W2 of the bias cord 6 is configured to be equal. If the cord angle of one of the bias cords is such that only a small torsional shearing force is generated, the width of the bias cord can be widened so that the entire crawler can cancel the generation of the torsional force. .
[0008]
FIG. 2 is a view showing a second reference example of the rubber crawler according to the present invention, and the reference reference example is configured as each cord constituting one layer of the bias cord in the same plane where the main cord 4 is laminated. The cords 5A, 5B, 6A and 6B having cord angles opposite to each other are alternately arranged in parallel.
With this configuration, the torsional force generated by the bias cord angle is offset between the cords 5A and 5B which are adjacently arranged and have the opposite cord angles and between the cords 6A and 6B. The torsion of the entire crawler is effectively suppressed. Here, the cord angles of the adjacent ones of the cords 5A to 6B are substantially equal in the reverse direction, and their widths are also substantially equal.
[0009]
FIG. 3 is a view showing a first embodiment of the rubber crawler according to the present invention. The present embodiment is a cord which constitutes one layer of a bias cord in the same plane where the main cord 4 is laminated. As described above, another presser cord 7 is disposed on the outer peripheral side of the abutting portion of the adjacent cords 5 and 6 with the opposite cord angles.
The other presser cord 7 has a relatively small width, has a cord angle orthogonal to the cord angle in the circumferential direction of the main cord 4, and does not affect the generation of torsional shear force. .
Note that the presser cord of the present embodiment can be used for a butt portion between adjacent cords of other embodiments of the present invention.
With this configuration, the butt portion between the cords can be firmly held when the rubber crawler 1 is wound around the driving roller and the driven roller or when the rubber crawler 1 is buffered by a wheel.
[0010]
FIG. 4 is a view showing a rubber crawler according to a second embodiment of the present invention. The present embodiment is a cord that constitutes one layer of a bias cord in the same plane where the main cord 4 is laminated. As described above, the edge of one cord (first bias cord 5 in the illustrated example) is overlapped with the other cord at the abutting portion of the cords 5 and 6 adjacent to each other with the opposite cord angles. An overlap portion 8 is formed.
With this configuration, in the present embodiment, one cord can be extended and function as a presser cord without separately providing a special member, and the butt portion between the cords can be reliably secured. It is possible to hold it.
In addition, the overlap part formed by extending the thing of this Embodiment can be used also for the butt | matching part between each adjacent code | cord | chord of the thing of other Embodiment in this invention.
[0011]
FIG. 5 is a view showing a third reference example of the rubber crawler according to the present invention. The reference example is a cord constituting one layer of the bias cord in the same plane where the main cord 4 is laminated. Among the plurality of cords 5, 6, 9 constituting the bias code, the total width W3 of the cords 9 having a predetermined code angle and the widths of the cords 5, 6 having a code angle opposite to the predetermined code angle The total of W4 + W5 is made equal.
Accordingly, the reference example has a single wide-width cord 9 having a predetermined bias angle, and cords 5 and 6 having a half width of the cord 9 and having opposite cord angles. It is comprised from.
With this configuration, various combinations of cords are possible by selecting the cord angle and width, and the degree of design freedom is improved.
[0012]
As mentioned above, the embodiment of the present invention has been described in detail. However, within the scope of the present invention, the shape, type, main and type of the bias cord of the rubber crawler (the rubber crawler main body is directly connected to the cord as well as the rubber drawing The cord material may be steel, organic fiber, or other suitable material.), Cord angle, presser cord arrangement, overlap portion formation, bias cord (In the embodiment shown in FIGS. 1 to 5, the cord angle of each cord constituting the bias cord is limited to a predetermined angle and a code angle opposite to this). However, as long as each cord constitutes one layer of bias cord in the same plane, the width of the cord to be combined depends on the selection of the different cord angles of each cord. Are within the scope of the invention be combined are selected appropriately so as not to cause torsional shear forces as.) For the like can be appropriately selected.
[0013]
【The invention's effect】
As described above in detail, in the present invention, the endless belt-like coreless rubber crawler in which a main cord having a circumferential cord angle is embedded has cord angles opposite to each other in the same plane. A bias code composed of two cords having substantially the same width formed by combining a plurality of cords is stacked on the main cord, and the bias cords alternately have cords having cord angles opposite to each other. An even number of cords are arranged in parallel, and among the plurality of cords constituting the bias cord, the total width of the cords having a predetermined cord angle and the width of the cord having a cord angle opposite to the predetermined cord angle. is equal to the total, by which is disposed the other code on the outer peripheral side of the butt portion of the adjacent code has a cord angle in opposite directions to each other, the lateral stiffness sure For example, the bias cord that is laminated on the main cord is a light and simple structure that requires only one layer in the same plane, but the torsional shearing force between the plural cords constituting the bias cord is small. Effectively offset, the torsional force is not generated by the tension when the rubber crawler is wound around the driving roller and the driven roller, and the straight traveling performance is improved.
Moreover, since the bias cord is a single layer, without causing the weight increase of the entire rubber crawler, driving rollers and on its winding rigidity running resistance lower to the driven roller is not increased at symmetrical Since a pair of bias cords only need to be provided, the manufacturing is simplified, the action of suppressing the generation of torsional force is relatively stable , and a large number of cords having a relatively narrow width can be provided, resulting in freedom of yield. The degree is improved. Furthermore, various combinations of codes are possible by selecting the code angle and width, and the degree of freedom in design is improved.
Furthermore, the butt portion between the cords can be firmly held when the rubber crawler is wound around the driving roller or the driven roller or is buffered by the wheel.
[0014]
Further, in an endless belt-shaped coreless rubber crawler in which a main cord having a circumferential cord angle is embedded, a single layer formed by combining a plurality of cords having opposite cord angles in the same plane. A bias cord composed of two cords having substantially the same width is stacked on the main cord, and the bias cord is constructed by alternately arranging an even number of cords having cord angles opposite to each other. a plurality of codes constituting the code is equal to the total width of the code having a total of a cord angle of said predetermined cord angle in the opposite direction from the width of the code having a predetermined cord angle, opposite to each other physician by having the edges to overlap the abutting portions of adjacent code has a cord angle of one of the codes, der the same effect as described above , Bias cord disposed are stacked in the main code for lateral rigidity securing, while being lightweight and simple structure that requires only one layer in the same plane, between a plurality of codes constituting this torsional shearing force is effectively canceled, without rubber crawler to generate a torsional force by the tension when wound around the driving roller and the driven roller, improved straight running performance, moreover, bias cord in a single layer Therefore, the weight of the entire rubber crawler is not increased, the wrapping rigidity around the driving roller and the driven roller is low, and the running resistance is not increased. In addition, a pair of bias cords are provided symmetrically. since Bayoi, manufacture is simplified, inhibition of occurrence of torsional force is also relatively stable, to increase the degree of freedom of yield it possible to arrange a large number of codes of relatively narrow width . Furthermore, various combinations of cords are possible by selecting the cord angle and width, and the degree of freedom in design is improved. In addition, one cord can be extended and pressed without any special member. It can be made to function as a cord, and the butt portion between the cords can be securely held.
Thus, according to the present invention, there is provided a rubber crawler capable of disposing a bias cord that can suppress the occurrence of torsion and improve lateral rigidity without incurring weight increase or winding rigidity around the roller.
[Brief description of the drawings]
FIG. 1 is a view showing a reference example of a rubber crawler according to the present invention, FIG. 1 (A) is a cross-sectional view of the rubber crawler, and FIG. 1 (B) is a bottom view of the main part as viewed from the arrow A in FIG. is there.
FIG. 2 is a bottom view of an essential part showing a second reference example of the rubber crawler of the present invention.
FIG. 3 is a bottom view of essential parts showing a first embodiment of a rubber crawler according to the present invention.
FIG. 4 is a bottom view of a main part showing a second embodiment of a rubber crawler according to the present invention.
FIG. 5 is a bottom view of essential parts showing a third reference example of the rubber crawler of the present invention.
FIG. 6 is a diagram for explaining one conventional example of a rubber crawler and its behavior.
FIG. 7 is a perspective view of a main part of another conventional example of a rubber crawler.

Claims (2)

In an endless belt-shaped coreless rubber crawler in which a main cord having a circumferential cord angle is embedded, one layer substantially the same configured by combining a plurality of cords having cord angles opposite to each other in the same plane A bias cord composed of two cords having a width of 1 is stacked on the main cord, and the bias cord is configured by alternately arranging even numbers of cords having cord angles opposite to each other. Among the plurality of constituting codes, the sum of the widths of the cords having a predetermined code angle is made equal to the sum of the widths of the cords having a code angle opposite to the predetermined code angle, and the code angles opposite to each other are set. A coreless rubber crawler characterized in that another cord is disposed on the outer peripheral side of the butted portion of adjacent cords . In an endless belt-shaped coreless rubber crawler in which a main cord having a circumferential cord angle is embedded, one layer substantially the same configured by combining a plurality of cords having cord angles opposite to each other in the same plane A bias cord composed of two cords having a width of 1 is stacked on the main cord, and the bias cord is configured by alternately arranging even numbers of cords having cord angles opposite to each other. a plurality of code constituting, is equal to the total width of the code having a total of a cord angle of said predetermined cord angle in the opposite direction from the width of the code having a predetermined cord angle, reverse code each other physician A coreless rubber crawler characterized in that an edge portion of one cord is overlapped at an abutting portion of adjacent cords having an angle .

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