JP4146143B2 - Elastic crawler - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates motor vehicles, agricultural machines such as combines and tractors, the elastic crawler used for a crawler type traveling device to be employed in the running section such as construction machinery such as a backhoe (endless track traveling device).
[0002]
[Prior art]
The crawler type traveling device includes, for example, a crawler unit mainly configured by winding an endless belt-like crawler belt (crawler belt) over a driving wheel, an idler (driven wheel), and a plurality of wheels. By rotating the wheel, the crawler belt is circulated in the circumferential direction, and is thereby driven.
As the crawler belt, there is an elastic crawler having a main body portion formed of a rubber-like elastic body, and there is an elastic crawler without a cored bar as the elastic crawler.
[0003]
In this coreless elastic crawler, a main cord made of a steel cord or the like disposed in the circumferential direction is embedded in an endless belt-like crawler main body constituting the main body portion. In addition, in order to increase lateral rigidity, for example, a bias cord in which a cord inclined with respect to the crawler circumferential direction is arranged on the crawler outer circumferential side of the main cord in the crawler body, and the crawler outer circumferential side of this bias cord And another bias cord in which cords in an inclination direction opposite to the inclination direction of the bias cord are arranged in parallel are embedded.
[0004]
[Problems to be solved by the invention]
In the elastic crawler, when it is wound around the drive wheel or idler, the bias on the crawler outer peripheral side with respect to the bias code on the crawler inner peripheral side among the bias cords disposed on the crawler outer peripheral side of the main cord. There is a problem that the cord has a higher tensile force, which causes twisting and deteriorates straightness.
In addition, in order to solve this problem, there is one in which a single layer of bias cord formed by combining a plurality of cords having mutually opposite cord angles in the same plane is laminated on the main cord. In this case, there is a problem that when traveling on a rough road, cracks occur at the boundary surface between adjacent cords having opposite cord angles due to unevenness of the road surface.
[0005]
Further, in the bias code, in the abutting portion of adjacent cords having a reverse cord angle, the edge portion of one cord overlaps the edge portion of the other cord, Only the wrapped portion has high rigidity, and the tension at the time of bending concentrates on the wrapped portion to generate heat, and the bias cord peels off.
In view of the above problems, the present invention provides an elastic crawler in which a plurality of bias cords having different inclination directions with respect to the crawler circumferential direction are embedded in the crawler main body in addition to the main cord, and twisting at the winding portion is performed. The purpose is to reduce and improve straightness.
[0006]
[Means for Solving the Problems]
The technical means taken by the present invention to solve the technical problem includes a crawler main body formed in an endless belt shape by a rubber-like elastic body, and is arranged in the crawler circumferential direction in the crawler main body . A main cord formed by juxtaposing tensile strength cords in the crawler width direction is embedded, and is inclined with respect to the crawler circumferential direction from the approximate center in the thickness direction in the crawler body to the crawler outer peripheral side and to the crawler outer peripheral side of the main cord . In addition to burying a bias cord formed by arranging the cords in parallel, an inclination direction with respect to the crawler circumferential direction of the bias cord from the substantially center in the thickness direction in the crawler body to the crawler inner circumferential side and the crawler inner circumferential side of the main cord ; It juxtaposed the tilt direction of the cord with respect to the crawler circumferential direction opposite other buried bias code comprising, acting on bias cord of the crawler inner peripheral side And compressive forces, of the tensile force acting on the bias cord crawler outer peripheral side, characterized in that the bending stiffness of the larger bias cord of the power was set to be smaller than the other bias cord.
[0007]
Further, by changing the inclination angle of the crawler outer peripheral side bias code and the crawler inner peripheral side bias code with respect to the crawler circumferential direction , the bending rigidity can be made different .
Further , the bending rigidity can be made different by changing the cord ends of the bias code on the crawler inner periphery side and the bias code on the crawler outer periphery side .
Further, the bending rigidity can be made different by changing the code diameters of the bias code on the inner side of the crawler and the bias code on the outer side of the crawler .
[0008]
Further, the bending rigidity can be made different by changing the material of the cords of the crawler inner peripheral side bias code and the crawler outer peripheral side bias code.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a view showing a cross section in the width direction B of an elastic crawler 1 employed in a crawler type traveling device, and FIG. 2 is a bottom cross-sectional view of a main part of the elastic crawler.
The crawler type traveling device includes a driving wheel, an idler, and a plurality of rolling wheels. The elastic crawler 1 is wound around the driving wheel, the idler, and the rolling wheel, and the driving wheel is rotated. By rotating, the elastic crawler 1 is circulated in the circumferential direction.
[0010]
The elastic crawler 1 is a core used in, for example, a high-speed four-crawler vehicle (a vehicle in which an Omusbi-type crawler type traveling device (crawler unit) is independently attached to four wheels instead of the front and rear tires of a four-wheel drive vehicle). It is a gold-less (no cored bar) elastic crawler 1 and has a crawler body 2 formed in an endless belt shape by a rubber-like elastic body.
A lug 3 is integrally provided on the outer peripheral side D of the crawler body 2, and a driving protrusion 4 is integrally provided at a central portion of the inner peripheral side C in the crawler width direction B (left-right direction). 3 and the drive protrusion 4 are arranged at an appropriate interval over the crawler circumferential direction A.
[0011]
When the engaging portion 5a of the driving wheel 5 is engaged with the driving protrusion 4, the driving force is transmitted from the driving wheel 5, and the driving protrusion 4 includes the driving wheel 5, the idler, It has a function of preventing wheel disengagement (disengagement of the elastic crawler 1) by engaging with the wheel.
A main cord 7 and a plurality of layers of bias cords 8 and 9 are embedded in the crawler body 2.
The main cord 7 includes a tensile cord 7a such as a steel cord disposed along the crawler circumferential direction A and arranged in parallel in the crawler width direction B.
[0012]
The bias cords 8 and 9 are configured by arranging cords 8a and 9a inclined with respect to the crawler circumferential direction A in parallel (arranged in parallel).
Further, the inclination direction of the cord 9a of the bias cord 9 located on the crawler outer peripheral side D with respect to the inclination direction of the cord 8a of the bias cord 8 (referred to as an inner peripheral bias code) located on the inner peripheral side C of the crawler. However, when viewed from the crawler thickness direction E, the cord 8a of the inner peripheral side bias cord 8 and the cord 9a of the outer peripheral side bias cord 9 cross each other. If the inclination angle (cord angle α1) of the inner side bias cord 8 with respect to the crawler circumferential direction A (cord angle α1) is a positive angle, the outer side bias cord 9 is inclined with respect to the crawler circumferential direction A (relative to the equator). The angle (code angle α2) is a negative angle (reverse code angle)).
[0013]
Accordingly, in the portion where the elastic crawler 1 is wound around the drive wheel 5 or the like, the twist generated by the bias cord 8 on the inner peripheral side is suppressed (cancelled) by the bias cord 9 on the outer peripheral side.
Further, the inner peripheral side bias cord 8 and the outer peripheral side bias cord 9 are disposed on the crawler outer peripheral side D with respect to the center F in the crawler thickness direction E of the crawler body 2.
By the way, in a portion where the elastic crawler 1 is wound around the drive wheel 5 and the like, a tensile force acts on the crawler outer peripheral side D from the center F in the crawler thickness direction E of the crawler main body 2, and the crawler thickness of the crawler main body 2 is increased. A compressive force acts on the inner peripheral side C of the crawler from the center F in the vertical direction E.
[0014]
Therefore, in the example shown in the figure, the tensile force of the bias cord 9 on the outer peripheral side is higher than the bias cord 8 on the outer peripheral side in the portion where the elastic crawler 1 is wound around the drive wheel 5 and the like. Although the possible twisting due to the difference of the tensile force of the side bias cord 8 and the outer bias cord 9 is generated, the elastic crawler 1 in the form status of this, the code angle α1 of bias cord 8 of the inner peripheral side On the other hand, by increasing the cord angle α2 of the bias cord 9 on the outer peripheral side, the bending rigidity of the bias cord 9 on the outer peripheral side is made smaller than that of the bias cord 8 on the inner peripheral side.
[0015]
Thereby, the twist resulting from the difference of the tensile force of the inner peripheral side bias cord 8 and the outer peripheral side bias cord 9 can be reduced, and linearity can be improved.
Further, by making the bending rigidity of the bias cord 9 on the outer peripheral side smaller than that of the bias cord 8 on the inner peripheral side, the bending rigidity at the winding portion is lowered, and the bending resistance of the elastic crawler can be reduced.
In the elastic crawler 1 having the above-described configuration, the inner peripheral bias cord 8 may be positioned at the center F of the crawler body 2 in the thickness direction E, and the main cord 7 is in the thickness direction of the crawler body 2. It may be located at the E center F.
[0016]
Further, the bias cords 8 and 9 may be arranged on the crawler inner circumferential side C from the main cord 7, and the bias cord 8 is arranged on the crawler inner circumferential side of the main cord 7, and the bias cord 9 May be arranged on the outer peripheral side of the crawler of the main cord 7.
Further, the elastic crawler 1 before Symbol shape state, bias cord 8 and 9, a case has been described that is provided on the outer peripheral side than the thickness direction E the center F of the crawler body 2 as an example, bias cord 8,9 However, in the case where the crawler body 2 is provided on the inner peripheral side with respect to the thickness direction E center F of the crawler body 2, the elastic crawler 1 is wound around the drive wheel 5 and the like with respect to the bias cord 9 on the outer peripheral side. In this case, the bending rigidity of the bias cord 8 on the inner peripheral side is configured to be smaller than that of the bias cord 9 on the outer peripheral side.
[0017]
Further, when the bias cord 8 is provided on the inner peripheral side of the crawler body 2 in the thickness direction E center F and the bias cord 9 is provided on the outer peripheral side of the crawler body 2 in the thickness direction E center F, Comparing the compressive force acting on the bias cord 8 on the circumferential side and the tensile force acting on the bias cord 9 on the outer circumferential side, the bending stiffness of the bias cord having the larger force is made smaller than the other bias cords. Constitute.
3 to 5 show other means for making the bending rigidity of the bias cord 8 on the inner peripheral side different from the bias cord 9 on the outer peripheral side, and the arrangement configuration of the main cord 7 and the bias cords 8 and 9 is as follows. is the same as that of the elastic crawler 1 of the previous Symbol form state.
[0018]
FIG. 3 shows a difference in bending rigidity by making the cord diameters of the bias cords 8 and 9 different. The cord diameter of the bias cord 9 on the outer peripheral side is different from that of the bias cord 8 on the inner peripheral side. By making it thinner than the cord diameter, the rigidity is made different.
FIG. 4 shows a difference in bending rigidity by changing the material of the cords 8a and 9a of the bias cords 8 and 9. For example, the cord 8a of the bias cord 8 on the inner peripheral side is made of a steel cord. By configuring the cord 9a of the bias cord 9 on the outer peripheral side with nylon 6 or nylon 66, the rigidity is made different.
[0019]
FIG. 5 shows that the bending rigidity of the inner side bias cord 8 and the outer side bias cord 9 is changed by changing the ends (number of driving) of the cords 8a and 9a. By making the end of the bias cord 8 larger than the end of the bias cord 9 on the outer peripheral side, a difference in rigidity is given.
2 to 5, the bias cords 8 and 9 on the inner and outer circumferences have different stiffnesses by appropriately combining the means for differentiating the bending stiffness of the bias cord, thereby reducing torsion and bending. The rigidity may be reduced.
[0020]
6 and 7 relates to a crawler type traveling device according to other forms state, FIG. 6 shows a crawler unit U which constitutes a crawler type traveling device, driven at the top between the front and rear pair of idler The wheel 5 is arranged, and a plurality of rolling wheels 11 are arranged in the lower part between the idlers 10.
The crawler unit U is used, for example, instead of the left and right front and rear wheels or the left and right rear wheels or the left and right front wheels of a four-wheel vehicle. The crawler type traveling device according to the present embodiment includes at least the left and right crawler units U. A pair is provided.
[0021]
The apparatus having the shape condition of this, the elastic crawler 1 is adopted to the left and right crawler unit U is basically configured similarly to that of the shape condition described above, the main code 7 in the crawler body 2 However, the difference is that the torsional characteristics of the elastic crawler 1 are formed in opposite directions in the left and right crawler units U. By providing the elastic crawler 1 having the reverse torsional characteristics, the torsion generated by the left and right elastic crawlers 1 is canceled out, and the straightness of the crawler type traveling device can be improved.
[0022]
Incidentally, in the intended shape state that put in FIGS. 6 and 7, bias cord may be at least more. Further, the crawler unit U may be of other types (for example, a plurality of rolling wheels provided between a driving wheel and an idler separated in the front-rear direction). What is necessary is just to provide the left-right pair.
In FIG. 8, the bias code 9 on the outer peripheral side is brought closer to the bias code 8 on the inner peripheral side, and the distance a between the main cord 7 and the bias code 8 on the inner peripheral side is greater than the distance b between the bias codes 8 and 9. In this case, by bringing the outer peripheral bias cord 9 closer to the inner peripheral bias cord 8, the tensile force acting on the outer peripheral bias cord 9 is lowered to reduce torsion.
[0023]
It is also possible to reduce the twist by using a tread pattern (lag pattern) that cancels the twist generated by the bias cord.
[0024]
【The invention's effect】
Can be reduced torsional generated by bending at the winding portion of the elastic crawler, Ru can be improved straightness.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view in the width direction of an elastic crawler.
FIG. 2 is a bottom cross-sectional view of a main part of an elastic crawler.
FIG. 3 is a bottom cross-sectional view of a main part of an elastic crawler.
FIG. 4 is a bottom cross-sectional view of the main part of the elastic crawler.
FIG. 5 is a bottom cross-sectional view of the main part of the elastic crawler.
FIG. 6 is a side view of the crawler unit.
FIG. 7 is a bottom cross-sectional view of the main part of the elastic crawler of the left and right crawler units.
FIG. 8 is a cross-sectional view in the width direction of the main part of the elastic crawler.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Elastic crawler 2 Crawler main body 5 Drive wheel 8 Bias code 8a Code 9 Bias code 9a Code 10 Idler A Crawler circumferential direction D Crawler outer circumference E Crawler thickness direction F Crawler thickness direction center U Crawler unit α1 Inclination angle (code angle)
α2 Inclination angle (code angle)

Claims (5)

A crawler body (2) formed in an endless belt shape by a rubber-like elastic body is provided, and a tensile strength cord (7a) disposed along the crawler circumferential direction (A) is placed in the crawler body (2) in the crawler width direction. The main cord (7) formed side by side in (B) is embedded, and the crawler of the main cord (7) on the crawler outer peripheral side (D) from the approximate center in the thickness direction (E) in the crawler body (2). A bias cord (9) formed by juxtaposing cords (9a) inclined with respect to the crawler circumferential direction (A ) is embedded on the outer peripheral side (D) , and the thickness direction (E in the crawler body (2)) Crawler inner circumference (C) from the approximate center and the crawler inner circumference (C) of the main cord (7), the crawler circumference in the direction opposite to the inclination direction of the bias cord (9) with respect to the crawler circumferential direction (A) inclination direction of the code with respect to the direction (a) Buried (8a) arranged side by side and becomes another bias code (8), a compression force acting on the bias cord (8) of the crawler inner peripheral side (C), bias cord of the crawler outer peripheral side (D) Of the tensile force acting on (9), the bending rigidity of the bias cord (8, 9) having the larger force is made smaller than that of the other bias cord (8, 9). Crawler. The bending rigidity is made different by changing the inclination angle of the crawler outer peripheral side (D) bias code (9) and the crawler inner peripheral side (C) bias code (8) with respect to the crawler peripheral direction (A) . The elastic crawler according to claim 1. Bending rigidity is made different by changing the end of the cord (8a, 9a) between the bias code (8) on the inner side (C) of the crawler and the bias code (D) on the outer side (D) of the crawler. The elastic crawler according to claim 1 or 2 . 2. The bending rigidity of the crawler inner peripheral side (C) bias cord (8) and the crawler outer peripheral side (D) bias cord (9) is made different by changing the cord diameter. 2. An elastic crawler according to 2 or 3. By changing the material of the cords (8a, 9a) of the bias cord (8) on the crawler inner peripheral side (C) and the bias cord (9) on the crawler outer peripheral side (D) , the bending rigidity is made different. The elastic crawler according to any one of claims 1 to 4 .

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