JPH0796873A - Crawler running device - Google Patents

Abstract

PURPOSE:To reduce the inclination of a crawler, to prevent a wheel coming off, to enhance the ability of mud discharge, to ensure the transmission of drive power and to enhance the durability. CONSTITUTION:In a crawler running device 1 composed of a plurality of wheels 2, 3 fitted thereon with tires 5, 6 made of elastic materials, and an endless band-like crawler 4 wound between tires 5, 6, at least one groove 7 is extended circumferentially on the outer peripheral surface of each of the tires 5, 6, a tension member 10 is embedded in the crawler 4, and guide protrusions 12 adapted to be fitted the groove 7 are formed at the inner surface of the crawler 4 at predetermined intervals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler traveling device in which tires of a plurality of wheels are fitted with endless belt-shaped crawlers.

[0002]

2. Description of the Related Art A light truck shown in FIG. 5 is known as a vehicle equipped with a crawler traveling device in which crawlers are mounted on tires of a plurality of wheels (see Japanese Patent Application Laid-Open No. 3-246176). The light truck 20 shown in FIG.
The front wheels 25, the rear wheels 26, and the rear wheels 2 of the idle wheels 27 on which the tires 22, 23, and 24 mounted on the vehicle body 21 are mounted.
6 and a crawler traveling device 29 including a crawler 28 mounted on the idler wheel 27, and a driving means and a steering means 3 not shown.
It is mainly composed of 0 etc.

Then, as shown in FIG.
2 to 24 are pneumatic tires made of an elastic material such as rubber. The crawler 28 is formed of an elastic material such as rubber in an endless belt shape, and shoulder portions 31 of the tires 23 and 24 are formed inwardly on both sides of the crawler 28. A side guide portion 32 that is opposed to the shoulder portion 3 of the tires 23 and 24.
1 is formed in a linear taper surface from the tread portion 33 to the side wall portion 34, and the inner portion of the side guide portion 32 of the crawler 28 is formed in a taper surface corresponding to the taper surface.

Further, as shown in FIG. 7, the double wheels 3
There is known a crawler traveling device 39 of a double tire drive type, which is composed of 5, 36 and a crawler 38 having a single row of guide projections 37 in the center. In both of these tire drive type crawler traveling devices 29 and 39, the driving force is frictionally transmitted, a smooth driving force is obtained, and there are advantages such as high-speed stability and low vibration.

[0005]

By the way, in the former case of the above-mentioned prior art (double guide projection system), the tires 23 and 24 are crawled by the crawler 2 in the case of a sharp turn or a slope running.
8, the shoulder portions 31 of the tires 23 and 24 come into contact with the side guide portions 32 as shown in FIG. 8, and a lateral force F indicated by an arrow in the figure acts on the side guide portions 32. Therefore, a bending moment (F × H) acts on the crawler 28, and the crawler 28 tilts as shown by the chain double-dashed line in FIG. 8, and when the force F increases, the tilt angle increases and the wheel derails. is there.

Further, in the former case, the protrusions of the side guide portion 32 are made high or sturdy as a measure against wheel derailment, but the crawler 28 becomes heavy and the cost is high, and the inner peripheral side of the crawler 28 is also increased. It is difficult to remove the mud that entered,
Mud or the like is often present between the outer circumferences of the tires 23 and 24 and the inner circumferential surface of the crawler 28, and there is a problem that the frictional force decreases and slipping easily occurs.

In the latter case (double tire system), foreign matter such as mud and grass enter between the wheels 35 and 36,
It is hard to come off and the invading mud etc.
Since the space between 41 is clogged, the space in which the guide protrusion 37 of the crawler 38 is fitted is filled, the guide ability is reduced and the wheel is released, and the tension is increased, which causes breakage and the like, and parts such as wheels. Is twice as large as the former, and there is a problem that the weight increases and the cost increases.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is that the crawler has a small inclination and it is difficult to remove the wheel, the excavability is good, and the driving force is surely applied. An object of the present invention is to provide a crawler traveling device with high economy and durability that can be transmitted.

[0009]

In order to achieve the above object, the present invention takes the following technical means. That is, the present invention comprises a plurality of wheels equipped with a tire made of an elastic material, and an endless belt-shaped elastic crawler in which a tensile body extending in the circumferential direction made of an elastic material mounted on the tire is embedded. In a crawler traveling device, at least one circumferential groove is provided on the tire outer peripheral surface of each wheel, a propulsion lug or a block is arranged on the outer peripheral surface of the elastic crawler, and the tire is formed on the inner peripheral surface of the tire. It is characterized in that the guide projections fitted into the concave grooves are provided at predetermined intervals.

Further, according to the present invention, at least one of the guide protrusions of the crawler and the side wall portion of the concave groove of the tire which is in contact with the guide protrusions is coated with a coating material made of a material having a low friction coefficient. Is characterized by.

[0011]

According to the present invention, since the guide protrusion provided on the crawler is located at the center portion in the width direction of the crawler, the inclination of the crawler is small even in the case of sudden turning or traveling on a slope.
Therefore, it becomes difficult to take off the bicycle. In addition, the outer peripheral surface of the tire has a simple shape and excels in soil scavenging from the groove, and is easily discharged to the mud from between the guide protrusions of the crawler.
Mud is not clogged between the tire and the crawler, and the driving force is reliably transmitted.

Further, by providing a covering material made of a material having a low friction coefficient between the contact surfaces of the tire and the guide protrusion, slipping is improved, it becomes difficult to remove the wheel, and rotation resistance is reduced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of the present invention, in which a crawler traveling device 1 is constituted by a drive wheel 2, a driven wheel 3 and an endless belt-shaped crawler 4, and both wheels 2 and 3 are Tires 5 and 6 of the same shape and size are mounted,
A crawler 4 is wound around the outer circumferences of the tires 5 and 6.

Each of the tires 5 and 6 is a pneumatic tire made of an elastic material. On the outer peripheral surface of the tire, there is formed an outwardly extending groove 7 having a substantially V-shaped cross section and extending in the circumferential direction at the center in the width direction. As shown in FIG. 3, a coating material (for example, a resin thin plate of nylon, polyester, etc., canvas, metal plate, etc.) 8 made of a material having a bottom friction coefficient is provided in the groove 7 from the groove bottom to the outer peripheral portion. It has been worn over.

The crawler 4 comprises a crawler body 9 made of an elastic material such as rubber and a tensile body 10 such as a steel cord embedded in the body 9 in a circumferential direction with a predetermined width. Lugs 11 are provided on the outer peripheral surface (ground contact portion) of the lug 11 at predetermined intervals in the circumferential direction. Crawler body 9
On the inner peripheral surface of the main body 9, there are provided guide projections 12 which are located in the central portion in the width direction of the main body 9 and which are fitted into the concave grooves 7 of the tires 5 and 6 with a slight clearance at predetermined intervals in the circumferential direction. It is set up. As shown in FIG. 3, the projection 12 has a covering material 13 (for example, a resin such as nylon or polyester, canvas, metal, etc.) made of a material having a low friction coefficient as a whole.
Is being worn.

In the first embodiment, when the vehicle makes a sharp turn or runs on a slope during traveling, the groove 7 of the tires 5, 6 is used.
Side wall of the claw 4 comes into contact with the guide projection 12, a lateral force F1 acts on the guide projection 12, and a rotational moment (F1 × H) acts on the crawler 4, but a rotational moment due to the reaction force F2 at the lug 11 end of the crawler 4 is generated. Since (F2 × L) is large,
The inclination of the crawler 4 is prevented, and therefore the tire 5,
The guide projection 12 does not come out of the concave groove 7 of 6 and it becomes difficult to remove the wheel.

According to the above embodiment, the tire 5,
Since the outer peripheral surface of 6 has a simple shape, foreign matter does not enter, and the concave groove 7 has a substantially V-shaped cross section in which the outer peripheral side is expanded.
Since it is in the shape of a letter, foreign matter such as mud can be easily discharged. Further, since the guide projections 12 are also arranged at a predetermined interval, the soil is excellently discharged and the mud does not clog and harden. Therefore, the tension acting on the crawler 4 does not increase, and the cause of breakage can be eliminated.

Furthermore, since the low friction coefficient coating materials 8 and 13 are adhered to the concave grooves 7 of the tires 5 and 6 and the guide projections 12 of the crawlers 4, the slip between them becomes better and it becomes difficult to remove the wheels. At the same time, the rotation resistance is reduced, and power transmission can be performed efficiently. FIG. 4 shows an essential part of the second embodiment of the present invention. The difference from the first embodiment is that each wheel 2, 3 has a ring-shaped tire 15 fitted integrally with a tubular wheel 14 to form an outer periphery of the tire 15. The groove 17 is provided, and a lateral reinforcement 18 such as a metal or non-metal plate is embedded inside the tensile body 10 in the main body 9 of the crawler 4. Although not shown, the guide protrusions 12 are each covered with a coating material made of a low friction coefficient material. The lateral strong material 1
8 may be formed with a protrusion that protrudes into the guide protrusion 12.

The second embodiment also has the same operation and effect as the first embodiment. The present invention is not limited to the above-mentioned embodiment, and for example, the low friction coefficient coating materials 8 and 1
3 can be attached only to the opposing side surfaces where at least the groove 7 and the guide projection 12 contact each other, and the lug 11 can be replaced with a block, and the design can be appropriately changed.

The groove 7 may be offset from the widthwise central portion of the outer peripheral surface of the tire, or a plurality of grooves may be formed. When forming the grooved grooves 7 in a numbered manner, it is preferable that the guide protrusions 12 of the crawler 4 are arranged in a staggered arrangement so that clogging does not occur. The covering materials 8 and 13 can be adhered to the tires 5 and 6 and the crawler 4 after molding, or can be vulcanized and adhered during molding.

[0021]

As described above, the present invention includes a plurality of wheels equipped with tires made of an elastic material and steel cords made of an elastic material such as rubber hung on the tires and extending in the circumferential direction. In a crawler traveling device comprising an endless belt-like elastic crawler in which a tensile body is embedded, a groove is provided in the tire outer peripheral surface of each wheel in the circumferential direction, and a propulsion lug or block is provided on the outer peripheral surface of the elastic crawler. Is disposed, the guide projections that fit into the groove of the tire are provided at the center portion in the width direction of the inner peripheral surface so as to project at a predetermined interval, so the inclination of the crawler is small, The crawler does not easily come off from the tire, prevents wheel removal, has good soil discharge performance, and prevents accidents due to mud clogging.In addition, it is easy to discharge the mud that has entered between the tire outer peripheral surface and the crawler inner peripheral surface, thus increasing the driving force. certainly Reach can, tire outer peripheral shape can be simple and lightweight, it is possible to improve the durability of the lower costs and crawlers.

Further, according to the present invention, at least one of the guide protrusions of the crawler and the side wall of the concave groove of the tire which is in contact with the guide protrusions is coated with a coating material made of a material having a low friction coefficient. Therefore, the sliding of the contact surface between the tire and the guide protrusion of the crawler is improved,
Further, it becomes difficult to take off the wheel and the rotational resistance is reduced, so that the durability can be improved.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention (A- in FIG. 2).
It is a sectional view taken along line A).

FIG. 2 is an overall front view of the same embodiment.

FIG. 3 is an enlarged view of part B in FIG.

FIG. 4 is a vertical sectional view showing a second embodiment of the present invention.

FIG. 5 is a side view of a light truck equipped with a conventional example.

FIG. 6 is a vertical cross-sectional view (enlarged cross-section taken along line C-C in FIG. 5) of a conventional example.

FIG. 7 is a vertical cross-sectional view (corresponding to a cross section taken along the line CC of FIG. 5) showing another conventional example.

FIG. 8 is an explanatory view of the operation of the conventional example shown in FIG.

[Explanation of symbols]

 1 crawler traveling device 2 driving wheel 3 driven wheel 5 tire 6 tire 7 concave groove 8 low friction coefficient coating material 10 tensile body 11 lug 12 guide protrusion 13 low friction coefficient coating material 15 tire 17 concave groove

Claims (2)

[Claims] 1. A crawler comprising a plurality of wheels equipped with tires made of an elastic material, and an endless belt-shaped elastic crawler in which a tension body extending in the circumferential direction and made of an elastic material mounted on the tires is embedded. In the traveling device, at least one circumferential groove is provided on the tire outer peripheral surface of each wheel, a propulsion lug or block is arranged on the outer peripheral surface of the elastic crawler, and an inner peripheral surface of the tire is provided. A crawler traveling device, characterized in that guide protrusions fitted into the concave grooves are provided at predetermined intervals. 2. A coating material made of a material having a low coefficient of friction is applied to at least one of the guide protrusion of the crawler and the side wall portion of the groove of the tire which is in contact with the guide protrusion. The crawler traveling device according to claim 1.