JPH11222167A - Rubber crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber crawler which is high in practical use in response to the demands of high speed machinery while running vibration is being reduced, and makes it unnecessary to be anxious about its durability. SOLUTION: In a rubber crawler 1 which is formed out of a rubber crawler main body 3 in an endless shape, each core meal which has paired core metal guides projected at its center part, concurrently, is extended in the crawler width direction inside the rubber crawler main body, and furthermore, is imbedded at certain intervals in the longer direction, each steel cord 5 imbedded in an endless form in the rubber crawler main body at the ground contacting side of each core metal, and of each lug 6 projected pit to the ground contacting side of the rubber crawler main body 2, the thickness (t) (unit: mm) of the rubber crawler measured from each steel cord to the ground contacting side at least at a place close to each engaging hole 2 in a core metal projected surface not covered with each lug 6, shall be related to the frame weight (w) (unit: ton) of a machine on which each rubber crawler is mounted, by an unequality of t/w>=3.0.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber crawler mounted around a foot of an agricultural work vehicle, a civil engineering / construction machine, or the like.

[0002]

2. Description of the Related Art FIG. 11 shows a conventional rubber crawler. The rubber crawler 41 is wound around a sprocket s and an idler (not shown) in an endless manner. Core 4 embedded in crawler
The second engaging portion 42a is driven by meshing with the second engaging portion 42a. During traveling, the rolling wheel r passes through the inner peripheral surface of the crawler body, and the high rigidity metal core embedding area and the low rigidity metal core are alternately arranged. Occurs, and the rolling wheel falls between the metal cores, and the traveling vibration increases as the vertical movement increases.

[0003] In order to reduce the vertical movement of the wheel, FIG.
The pitch of the core bar 52 is reduced (short pitch) as shown in FIGS.
(Japanese Patent Laid-Open No. Hei 1-208288) has been proposed.
issue). In the rubber crawler 51, since the lug 53 has a circumferential length that covers the two cores, the rolling wheel always rides on the left or right lug between the cores, so that the vertical movement of the rolling wheel is small. As a result, traveling vibration is reduced.

[0004]

However, in a relatively small-sized machine or the like, the rubber crawler having the short pitch is difficult in terms of strength and design due to an excessively small core metal, and is cost-effective. Is difficult. It is an object of the present invention to provide a highly practical rubber crawler that responds to a demand for speeding up a machine by reducing running vibration without worrying about durability of the rubber crawler by another method.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides an endless rubber crawler body, a pair of metal core guides projecting from the center, and a crawler width direction inside the rubber crawler body. A metal core extending in the longitudinal direction and embedded at regular intervals in the longitudinal direction, a steel cord endlessly embedded in the rubber material on the ground side of the metal core, and a rubber lug protruding from the ground side of the rubber crawler body. Rubber crawler
The thickness of the rubber crawler body not covered by the lug on the projection surface of the metal core and at least the portion from the steel cord from the engagement hole to the grounding surface is t (unit: mm), and the weight of the machine to which the rubber crawler is mounted Is w (unit; ton),
A rubber crawler characterized by satisfying t / w ≧ 3.0 is proposed. More preferably, t / w> 4.8. It is more desirable to arrange the rubber lugs on the left and right in a staggered manner or between the metal cores.

FIG. 7A is a graph showing the test results of the cut resistance. In an actual machine, a turning resistance as shown in FIG. A test was conducted on the relationship between the rubber thickness of the rubber crawler body and the load with respect to cuts generated when the blade N with a constant load applied thereto was pressed against the installed rubber crawler G. In general, when a deep cut reaching the steel cord is made, moisture penetrates from the cut, the steel cord is corroded, the steel cord is cut, and the rubber crawler becomes unusable. Therefore, when the load at which cuts reach the steel cord is shown as a limit, the graph shows that the rubber thickness is proportional to the load.The thicker the rubber, the better the durability when a load is applied. Hateful.

Further, a similar cut resistance test was conducted by comparing the positional relationship of the cored bar. FIG. 8 is a schematic view for explaining the position, in which K indicates a metal core, P indicates a rubber crawler body, C indicates a steel cord, and R indicates a lug. From the test results, it was found that the projected surface B of the cored bar was more likely to be cut and inferior in durability than the space A between the cored bars. This is because when a load is applied, the rubber is bent between the cores A and the load is dispersed, but the load is concentrated because the cored projection surface B has a rigid body called the core.

FIG. 9 is a view showing a position where a cut scratch is generated on a rubber crawler in an example of a running test performed in a quarry. A is a plan view on the ground side, and B is a cross-sectional view taken along the line BB of A. This rubber crawler has a rubber thickness t = 14.4 mm and a body weight w =
3.0 ton, t / w = 4.8, and cut wounds X that reach steel cord C after running for 100 hours in a quarry where large and small stones including sharp stones are scattered are written in one place. It is. In the figure, H is an engagement hole,
K 'is a cored bar engaging portion. From this figure, it can be seen that cut flaws are generated more near the engagement hole than near the rubber crawler end on the ground contact surface side.

As described in the above test, under severe conditions in a quarry, if t / w is less than 4.8, cuts reaching the steel cord are liable to occur, causing a problem in the durability of the rubber track. . However, the actual use of rubber crawlers is often used for traveling in urban areas such as paved roads, and has relatively the same durability even when t / w is smaller than traveling in quarries. In view of the above points, the present inventor has conducted numerous experiments on various rubber crawlers.

FIG. 10 is a chart obtained by the above experiment. That is, this drawing is a graph showing the ratio of the rubber thickness t (unit: mm) to the body weight w (unit: ton) in relation to the degree of damage in traveling in an urban area and traveling in a quarry. The degree of damage is obtained by evaluating the degree of cut damage of the rubber track on the projected surface of the metal core between the lugs based on the durability of the rubber track during actual use. The rubber thickness t indicates the thickness of the rubber crawler main body from the steel cord on the projection surface of the cored bar. From this figure, it can be seen that the degree of damage decreases as t / w increases, but under severe conditions such as quarries, t / w> 4.8, whereas in the case of general paved roads and the like, In urban driving in a wide range of use, the following values are considered in consideration of sufficient durability, economy, etc., and t / w
It has been concluded that it is preferable to set ≧ 3.0.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings.

FIG. 1 shows a rubber crawler according to the present invention. The rubber crawler 1 has a core metal 4 embedded at regular intervals in an endless rubber crawler body 3 having an engagement hole 2 formed in the center. The steel cord 5 is embedded in the rubber crawler body 3 on the grounding side of the metal core 4 in the crawler width direction. The metal core 4 has metal core guides 4b, 4b and wings 4c, 4c formed on both sides of the engaging portion 4a, respectively, and the rolling wheels run on the metal core guides 4b, 4b. The lugs 6, 6 are arranged on the grounding side of the rubber crawler body 3 in a zigzag manner on the left and right sides and between the metal cores.
Corresponding to the staggered lugs 6, the core bar guides 4b are also formed in a staggered manner.

As shown in FIG. 1C, the lug 6 on the projection surface of the cored bar 4 is formed.
The thickness of the rubber crawler body from the steel cord 5 of the rubber crawler body 3 which is not covered with the ground to the grounding side is t (unit: m
m) and the body weight of the rubber crawler is w (unit: to
n), t / w ≧ 3.0. In this embodiment, t = 7.9 mm, w = 1.4 ton, t / w =
It is 5.6. The lug is placed between the cores, but it may be slightly covering the projected surface of the core,
At this time, if the ratio of t / w ≧ 3.0 is satisfied when the projection of the core metal not covered with the lug is 30% or more, the durability of the rubber on the projection of the core metal becomes favorable, which is preferable.

FIG. 2 shows a second embodiment of the present invention.
The lugs 6 are arranged between the cores 4 in a zigzag manner on the left and right sides and partially cover the projected surface of the cored bar, and the rubber crawler body 3 that is not covered by the lugs 6 on the projected surface of the cored bar 4 is t / t. w ≧ 3.
0 is formed in the thick portion 7 that satisfies 0. As a result, the projected surface of the core metal, which is susceptible to cut scratches, has an appropriate rubber thickness, and the durability is improved. Further, as is apparent from FIG. 9, since the cut is likely to enter the engagement hole 2, the rubber thickness t closer to the engagement hole than to the end of the rubber crawler is t / t.
The thick portion 7 as shown in FIG. 3 may be formed so that w ≧ 3.0.

FIG. 4 shows a fourth embodiment of the present invention.
The lug 6 covers a part of the projection surface of the metal core 4 and is formed diagonally and in a zigzag manner on the left and right sides. The rubber thickness of the projection surface of the metal core 4 not covered by the lug 6 is t / w ≧ 3. 0.0. In this lug arrangement, since the distance between adjacent lugs is narrow, the damage of the rubber crawler body 3 on the projection surface of the metal core that is not relatively covered by the lugs is small, so that t / w is a relatively small value, that is, t / w = It can be between 3.0 and 4.0. In this embodiment, t = 18.3 mm, w = 5.3 ton,
t / w = 3.5. In addition, the cored bar 4 has the cored bar guides 4b, 4b formed in a zigzag shape on the left and right, and provided with protrusions 4e, 4e, 4e ', 4e' for preventing lateral displacement.

FIG. 5 shows a fifth embodiment of the present invention.
The T-shaped lug 6 is arranged on the projection surface of the core 4, and the core 4 is provided with rolling rails 4 d, 4 d of outer collar wheels on both sides of the core guides 4 b, 4 b. FIG. 6 shows a sixth embodiment of the present invention, in which a lug 6 formed in a zigzag shape on the left and right across the engagement hole 2 is connected by a lug 6 ′ formed on the projection surface of the engagement hole. Has become.

The rubber crawler of the present invention is not limited to the above embodiment, and the lug can have various shapes such as T-shape, trapezoidal shape, bar shape, and the like. The guide 4b and the rolling rail 4d are engaged with the engaging portion 4a.
May be formed in a zigzag pattern on the left and right sides, but at least the rubber thickness of the projection surface of the core metal from the engagement hole 2 not covered with the lug is set to t / w ≧ 3.0.

[0018]

Since the present invention is configured as described above, the following effects can be obtained. By improving the durability of the rubber crawler main body on the projection surface of the core metal that is not covered with the lugs, the occurrence of cut scratches is suppressed, cutting of the steel cord is prevented, and the durability of the rubber crawler is improved. In addition, a highly practical rubber crawler can be provided without having to worry about the durability of the projection surface of the cored bar even in a heavy body. In addition, the placement of lugs between the cores reduces running vibrations, enabling the machine to respond to speeding-up of relatively small machines and increasing rigidity between the cores. In addition, since the space between the metal cores is less likely to be twisted, it is possible to provide a rubber crawler that is excellent in preventing derailing. Further, the lugs are arranged in a zigzag manner on the left and right, and the cored bar guide on which the wheels run is also formed in a zigzag manner, thereby further reducing the running vibration.

[Brief description of the drawings]

FIG. 1 shows a rubber track of the present invention, wherein A is a plan view on the ground side, B is a plan view on the wheel side, and C is a cross-sectional view taken along line CC of B.

FIG. 2 is a ground-side plan view showing a rubber track according to a second embodiment. It is an operation explanatory view.

FIG. 3 is a ground-side plan view showing a rubber track of a third embodiment.

FIG. 4 is a ground-side plan view showing a rubber track according to a fourth embodiment.

FIG. 5 is a ground-side plan view showing a rubber track according to a fifth embodiment.

FIG. 6 is a ground-side plan view showing a rubber track of a sixth embodiment.

FIG. 7 shows a test of cut resistance, in which A is a graph showing the relationship between rubber thickness and load, and B is an explanatory diagram of a test apparatus.

FIG. 8 is a schematic diagram illustrating a damage test location of a general rubber track.

FIG. 9 is an explanatory view showing a state of cut scratches on a rubber crawler after a running test in a quarry, where A is a ground plane side plan view,
B is a sectional view taken along line BB of A.

FIG. 10 is a graph showing a relationship between a rubber thickness ratio and a degree of damage of a rubber crawler of the present invention with respect to a machine body load.

11A and 11B show a conventional rubber track, in which A is a plan view on the ground side, and B is a cross-sectional view of a sprocket winding portion.

FIG. 12 shows a rubber track of JP-A-1-208288, wherein A is a plan view on the ground side, and B is a cross-sectional view of a sprocket winding portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rubber crawler 2 Engagement hole 3 Rubber crawler main body 4 Core metal 5 Steel cord 6 Lug 7 Thick part

Claims (5)

[Claims] An endless rubber crawler main body, a pair of core metal guides protruding from a central portion, and extending in a crawler width direction in the rubber crawler main body and embedded at regular intervals in a longitudinal direction. A rubber crawler comprising a steel cord endlessly embedded in the rubber crawler body on the ground side of the core metal and a rubber lug protruding from the ground side of the rubber crawler body. The thickness t (unit; mm) of the rubber crawler body from the steel cord at least at the portion from the engagement hole to the ground side, which is not described, is t with respect to the body weight w (unit; ton) of the machine on which the rubber crawler is mounted. A rubber crawler, wherein /w≧3.0. 2. An endless rubber crawler main body, and a pair of core metal bars protruding from a central portion and extending in a crawler width direction in the rubber crawler main body and embedded at regular intervals in a longitudinal direction. A rubber crawler comprising a steel cord endlessly embedded in a rubber crawler body on the ground side of the core and a rubber lug protruding from the ground side of the rubber crawler body, wherein the rubber lug is disposed between the cores. At the same time, the thickness t of the rubber crawler body not covered by the lug on the projection surface of the metal core and at least from the steel cord at the location from the engagement hole to the grounding side is adjusted to the machine weight w of the machine on which the rubber crawler is mounted.
A rubber crawler, wherein t / w ≧ 3.0. 3. The rubber crawler according to claim 1, wherein t / w> 4.8. 4. The rubber crawler according to claim 1, wherein the rubber lugs are arranged in a staggered manner on the left and right. 5. The rubber crawler according to claim 4, wherein the cored bar guide on which the rolling wheel runs is formed in a staggered shape corresponding to the lug arrangement.