JP2001048068A - Elastic crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce vibration of a rolling wheel by making an end part height of a shorter top face in a circulating direction length for a center line of a core bar base part in a guide projection lower than a longer top face. SOLUTION: In a top face 7 of a guide projection 2C of a core bar 2 disposed in a crawler main body 1, top faces 7A, 7D longer in circulating direction length of the projection 2C for a center line C of a core bar base part 2B have the same height and are made flat surfaces which are substantially parallel to an inner peripheral surface of the main body 1, top faces 7B, 7C shorter in circulating direction length are made inclined surfaces of a prescribed angle θwhich become lower toward end parts, the end part heights of the top faces 7B, 7C are lower than the top faces 7A, 7D and a difference in level H is provided. The difference in level H is changed according to machine weight and hardness of an elastic material constituting the crawler main body 1. When a rolling wheel transfers from the top face 7D to the adjacent core bar top face 7A, vibration is reduced because the top face 7A slightly sinks in the same way as the top face 7D and the rolling wheel is capable of transferring with hardly generating vertical movement difference of the rolling wheel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endless elastic crawler made of an elastic material such as rubber.

[0002]

2. Description of the Related Art Generally, crawlers used as traveling devices in construction machines and the like include metal crawlers and rubber crawlers, and drive sprockets and guide rollers to which metal crawlers are attached. There is a wheel or the like in which an elastic crawler can be attached.

Conventionally, as this kind of elastic crawler, FIG.
As illustrated in FIGS. 0 to 12, a pair of left and right guide projections 12A, 12A are provided in an endless belt-shaped crawler body 11 made of an elastic material.
Are embedded at predetermined intervals in the circumferential direction, and tensile members 13 such as steel cords are embedded, and lugs 14 are respectively provided on the outer peripheral surface of the main body 11 corresponding to the bases 12B of the respective cores 12. Is provided.

[0004] The guide projections 12A, 12A are arranged in a zigzag pattern shifted in the circumferential direction, and the top surfaces 15, 15 of the projections 12A, 12A are arranged.
Is wide as the rolling surface of the rolling wheel 16, idler, etc., and the guide protrusions 12A, 12A
It is as small as possible in consideration of derailing. Therefore,
An opposing area X in which the guide protrusion 12A is located on the cored bar base 12B and a non-opposed area Y located between the cored bar bases 12B are formed.

[0005]

By the way, in the above-mentioned prior art, the height of the guide protrusions 12A, 12A of the cored bar 12 is the same, and the rolling wheels 16 and the like are moved in the direction shown by the arrow A in FIGS. When the rolling wheel 16 is on the top surface 15A during the rolling pass, the weight of the body is supported only by the guide protrusion 12A on one side. At a certain inclination angle θ, and then the rolling wheel 16 is moved to the top surface 15B.
When the vehicle travels to the top, the vehicle climbs over the step indicated by T in FIG. 13, and the aircraft sinks on the top surface 15A, and on the top surface 15B, the rolling wheels collide with the end of the top surface 15B, causing vibrations. is there.

Conventionally, as shown in FIG. 14, the guide projections 12A, 12A are divided in the circumferential direction and arranged at intervals, and a rubber projection 17 slightly higher than the height of the projections 12A is provided between the guide projections 12A, 12A. However, it is not possible to eliminate rolling wheel vertical vibration. The present invention has been made in view of the above situation, and an object of the present invention is to provide an elastic crawler capable of reducing vibration of rolling wheels and the like.

[0007]

According to the present invention, the following technical measures have been taken in order to achieve the above object. In the endless belt-shaped crawler body made of an elastic material, a large number of metal cores having guide protrusions that face left and right in the width direction of the crawler body and that face each other in the circumferential direction are embedded in the circumferential direction, and the guide protrusions facing the left and right Are displaced in the circumferential direction, and the top surface thereof is a rolling surface of a rolling wheel or the like. It is characterized in that the end height of the shorter top surface is lower than that of the longer top surface.

[0008]

According to the present invention, the height of the top surface having the shorter length in the circumferential direction of the protrusion with respect to the center line of the core metal base is made lower than that of the longer top surface. When the wheel is transferred from the cantilevered state to the top surface of the opposing guide projection, the wheel is smoothly transferred without stepping over a step unlike the conventional case, vibration is reduced, and riding comfort is improved.

[0009]

1 to 5 show a comparative example of the present invention. Reference numeral 1 denotes a crawler body made of an elastic material such as rubber, which is formed in an endless belt shape. Reinforcing materials such as cords and other tensile members 3 and canvases 4 are buried, and a pair of left and right ground lugs 5
Each is formed corresponding to 2A.

A large number of metal cores 2 are arranged at predetermined intervals in the longitudinal direction, ie, circumferential direction, of the crawler body 1, and between the metal cores 2, the driving sprocket is located at the center of the crawler body 1 in the left-right width direction. An engagement hole 6 (not shown) is provided. As shown in FIG. 4, the metal core 2 integrally connects the pair of right and left metal core bases 2B with the locking parts 2A, and at the ends of the metal core bases 2B on the locking part 2A side, On the anti-ground contact (inner peripheral surface) side, a pair of roller-supporting guide projections 2C facing left and right in the width direction of the crawler body are provided so as to be shifted in the circumferential direction (to be staggered). The top surface 7 of the projection 2C is a rolling surface such as a wheel.

Further, the top surface 7 of the guide projection 2C of the core 2
The top surface 7A, 7D of the protrusion 2C having the longer length in the circumferential direction with respect to the center line C of the cored bar base 2B is a flat surface having the same height and substantially parallel to the inner peripheral surface of the main body 1. The top surfaces 7B and 7C having the shorter length in the circumferential direction are inclined surfaces having a predetermined angle θ that become lower toward the ends, and the end heights of the top surfaces 7B and 7C are lower than the top surfaces 7A and 7D. , A step H is provided. Since the step H changes depending on the weight of the machine body and the hardness of the elastic material constituting the crawler body 1, the step H corresponding to each crawler is set in consideration of these. The inclination start position S of the top surfaces 7B, 7C may be located on the top surfaces 7A, 7D side of the center line C of the metal core base 2B as shown in FIG. The height may be lower than the top surface of the projection non-opposed area Y within the plane area.

FIG. 5 is also a comparative example, in which the top surfaces 7B and 7C of the guide projections 2C are flat surfaces having a step H and parallel to the top surfaces 7A and 7D, and only the connecting portions of the top surfaces are inclined. 7E and 7F. In the above comparative example, when the elastic crawler is wound around a driving sprocket, a wheel and an idler instead of the metal crawler of the traveling device, and traveling on a pavement road surface,
The rolling wheel passes on the top surface 7 of the guide protrusion 2C of the metal core 2 while rolling in the direction shown by the arrow A in FIG. At this time, the rolling wheel is deformed on the top surface 7A due to the deformation of the lug 5 and the like and the cantilever state as shown in FIG.
As shown in the figure, the crawler inclines slightly, but the end of the opposing area top surface 7B where the wheel subsequently rolls is lowered by the step H, so that the wheel does not collide, There is almost no vibration on the wheels or the body,
When transferring onto 7C and 7D, the rolling wheels roll smoothly due to the inclined surface. Since the top surface 7C is gradually lowered by the step H, the rolling wheel smoothly rolls even when the rolling wheel becomes cantilevered on the top surface 7D.

When the wheel is transferred from the top face 7D to the top face 7A of the adjacent metal core, the top face 7D slightly sinks due to the deformation of the lug 5 or the like and the cantilever state. Since it is a separate cored bar, it sinks slightly like the top surface 7D, and the wheels can be transferred with little difference in vertical movement of the wheels etc., so vibration is reduced and smooth operation can be realized .

The top surface 7 has a center in the width direction and a center line C.
Is set as a point object, so that the same effect as described above can be obtained even when the rolling wheel rolls in the direction opposite to the arrow A in FIG. FIGS. 6 to 9 show an embodiment of the present invention. The difference from the comparative example is that two pairs of guide projections 2C of the cored bar 2 are provided at predetermined intervals in the circumferential direction of the crawler main body 1, and between the guide projections 2C. Is that the top surface 8A made of an elastic material integral with the crawler body 1 is provided with a flat guide protrusion 8, and the height of the top surface of the guide protrusion 8 is higher than the top surfaces 7A and 7D of the cored bar 2. It is slightly higher, and the same effect as in the comparative example can be expected.

The top surfaces 7B, 7C of the guide projections 2C of the cored bar 2
May be a flat surface parallel to the top surfaces 7A and 7D lower by the step H as shown in FIG. 8, or an inclined surface having an inclination angle θ as shown in FIG. In the above embodiment of the present invention, the step H of the guide protrusion 2C of the core 2 is P × 0.00.
It is preferable to set the range from 8 to P × 0.04 mm, and this value is such that when the rolling wheel rolls from the end of the longer top surface 7A to the center line C of the metal core base 2B, the center of the rolling wheel is It is almost the same as the distance to move upward.

That is, a description will be given with reference to FIG.
If the distance from the center line C in the peripheral direction of the adjacent cored bar is P, and the distance from the center line C to the end of the longer top surface 7A of the guide projection 2C is l, P / L is approximately 2
/ L, and the inclination of the crawler in the circumferential direction due to the weight of the body and the like is α at the end of the top surface 7A where the rolling wheel is longer.
Is set to be between 1 and 4 degrees, so when the inclination α in the peripheral direction is 1 degree, the step H is approximately P × 0.008, and when the inclination α is 4 degrees, the step H is approximately P × 0.04. Because it becomes.

It should be noted that the present invention is not limited to the above-described embodiment, and the adjacent top surfaces 7D may be crossed in a side view so as to smoothly transfer the wheels.

[0018]

As described above, according to the present invention, a core metal having guide projections which are opposed to the left and right in the width direction of the crawler body and are opposed to the front and rear in the circumferential direction is provided in the endless belt-shaped crawler body made of an elastic material. In an elastic crawler having a large number embedded in the circumferential direction, the guide projections facing left and right are arranged shifted in the circumferential direction, and the top surface thereof is a rolling surface such as a rolling wheel, the guides facing the front and rear are provided. Since the height of the end of the shorter top surface in the circumferential direction with respect to the center line of the cored bar base in the projection is lower than the longer top surface, Smooth operation can be realized by reducing the vibration of the wheels and the like.

[Brief description of the drawings]

FIG. 1 is a plan view of an inner peripheral surface (a side opposite to a ground contact surface) showing a comparative example of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is an enlarged perspective view of a metal core.

FIG. 5 is an enlarged perspective view showing a modified example of the cored bar.

FIG. 6 is a plan view showing an example of the present invention as viewed from an inner peripheral surface.

FIG. 7 is a front view of FIG. 6;

FIG. 8 is an enlarged perspective view of a cored bar.

FIG. 9 is an enlarged perspective view showing a modified example of the cored bar.

FIG. 10 is a plan view showing an example of the related art viewed from an inner peripheral surface.

FIG. 11 is a sectional view taken along line BB of FIG. 10;

FIG. 12 is a front view of FIG. 10;

FIG. 13 is an operation explanatory view of a conventional example.

FIG. 14 is a plan view showing another conventional example viewed from an inner peripheral surface.

[Explanation of symbols]

 1 Crawler main body 2 Core 2B Core base 2C Guide projection 3 Tensile body 5 Lug 7 Top 7A Top 7B Top 7C Top 7D Top C Centerline of core base H Difference in height of top ( (Step) X Projection facing area Y Projection non-facing area

Claims (1)

[Claims] In an endless belt-shaped crawler body made of an elastic material, a large number of metal cores having guide projections facing left and right in the width direction of the crawler body and facing the front and rear in the circumferential direction are buried in the circumferential direction. In an elastic crawler in which guide projections facing each other are displaced in the circumferential direction and the top surface of which is a rolling surface of a rolling wheel or the like, the guide projection is opposed to the center line of the core metal base in the guide projections facing the front and rear. An elastic crawler, wherein the height of an end of a top surface having a shorter length in the circumferential direction is lower than that of a top surface having a longer length.