JPH03193572A - Crawler - Google Patents

Abstract

PURPOSE:To keep off any derailing from a tire as well as to improve the extent of turning performance by dividing a core bar, which is embedded at a specified pitch in the longitudinal direction of a body in a state extending in a cross direction of the body formed in an endless form by an elastic body, into two, parts, left and right in an almost central part in the longitudinal direction. CONSTITUTION:A crawler 10 is provided with a body 11 formed into an endless form, a core bar 20 embedded in the former and a reinforced cord 13, and it is formed into width dimensions capable of covering the treads of a tire. Each rising part 15 is formed in both ends in the cross direction of the tire at a specified pitch in the longitudinal direction of the body 11, and it comes into contact with both these ends of the tire so as to hold it in between from both sides, thereby preventing any slippage in the cross direction of the body 11, thus derailing from the tire is kept back. The core bar 20 reinforcing the body 11 is situated in a forming part of the rising part 15 of the body 11, and embedded in the longitudinal direction of the body 11 at the same pitch as the forming pitch of the rising part 15. This core bar 20 is divided into two parts, right and left, and these symmetrical split bodies 21 in the same form are oppositely set up on the same line in a reverse state, through which the core bar 20 is constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a crawler that is wrapped around the tires of a vehicle such as a work vehicle for traveling on rough terrain.

[Conventional technology]

For example, the crawler 1 has a track 2 as shown in FIG.
It is used and attached to etc. A plurality of vehicles 3.3 are provided at the lower part of the cargo platform of the trunk 2, and tires 4.4 of each vehicle 3.3 are endlessly covered with tires 4.4 to enable the trunks to run on rough terrain.

Figure 12 (al) shows a conventional crawler 1 in which the wheels are passed between tires in this way, and includes an endless main body 5, a core bar 6 buried in the main body 5, and an IIP installed in the longitudinal direction of the main body 5. The main body 5 is entirely made of an elastic material such as rubber, and has a "U" shape with both widthwise ends 5a, 5a standing upward. The main body 5 is laid over the tire surface so that the tire 4 comes into contact with the inner peripheral surface of the main body 5.The core metal 6 is embedded at a predetermined pitch in the longitudinal direction of the main body 5. This core metal 6 reinforces the main body 5 with its rigidity.
It extends continuously in the width direction, and both ends thereof are bent upward like both ends 5a, 5a of the main body 5. As shown in FIG.
The vehicle runs on the road surface by shifting the tires between the four, but because the contact area with the road surface is wide, it is possible to drive on uneven roads such as uneven roads or soft roads.

[Problem to be solved by the invention]

However, in conventional crawlers, when the crawler turns in a straight line by turning the steering wheel, the wheels frequently come off the tires during the turn. (in Fig. 12) shows the turning state of the tire 4. The tire 4 turns (ψ) in the turning direction (rightward +i+1), and the -ζ crawler is pressed in the turning direction by this 1 turn.By the way, the crawler 1 Since a core metal 6 that is continuous in the width direction of the main body 5 is embedded in the main body 5, this core metal 6
Due to its rigidity, the main body does not bend. Therefore, since the entire crawler l maintains the same shape, the side opposite to the turning direction is raised, and the contact area with the road surface is rapidly reduced. As a result, the crawler 1 slips in the direction shown from the solid line to the broken line in FIG. The crawler 1 rides on the upright portion 5a of the tire 4, causing deformation of the tire 4, and the crawler 1 stretches in the width direction due to the load of the tire running on the tire.These factors combine to cause the crawler to derail from the tire 4. Such derailment occurs when the turning angle is The thicker it is, the more likely it is to occur, and for this reason, there is a limit to the turning performance of conventional crawlers.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a crawler that can prevent wheels from coming off the tires and improve turning performance.

[Means to solve the problem]

In order to achieve the above object, the present invention has a main body formed into an endless shape of an elastic body so that the width covers the tread of a tire and both ends in the width direction are bent in the direction of the tire; The core metal is embedded in the longitudinal direction of the main body with a predetermined pinch while extending in the width direction, and the core metal is divided into left and right parts approximately at the center in the length direction.

[Effect]

Since the core metal inside the crawler is divided into left and right parts, the main body has the flexibility to bend arbitrarily along the divided part of the core metal.

In addition, the core bar divided into left and right parts makes it difficult for the effects of stress, deformation, etc. in one direction to be transmitted to the other. In this situation, even if the pressure force applied to the tire due to turning is applied, the pressure force only acts on the side of the turn and has little effect on the side opposite to the turn, and the side opposite to the turn maintains its tracking with the tire. For,
This prevents wheels from coming off.

〔Example〕

The present invention will be explained in detail below with reference to the drawings.

1 to 4 show a crawler lO according to an embodiment of the present invention. The crawler 10 includes a main body 11 formed into an endless shape from an elastic material such as rubber, and a core bar 20 and a reinforcing cord 13 embedded in the main body 11. The main body 11 is wound around the tire with its inner peripheral surface in contact with the tire, and is formed to have a width that covers the tread of the tire so that the driving force for running is transmitted. It has become. Further, upright portions 15.15 are formed at both ends of the main body 11 in the width direction to bend upward. This standing portion 15.
15 are formed at a predetermined pitch in the longitudinal direction of the main body 11, and abut on both ends of the tire connected to the tread so as to sandwich from both sides to prevent the main body 11 from shifting in the lateral direction.
It acts to prevent the tire from falling off. Incidentally, lugs 16 serving as a grounding portion are formed in a predetermined pattern on the outer peripheral surface of the main body 11.

The core metal 20 is embedded in such a main body 11,
Its rigidity acts to reinforce the main body 11.

This core metal 20 is located at the formation site of the upright portions 15 of the main body 11, and is provided in the longitudinal direction of the main body 11 at the same pitch as the formation pitch of the upright portions 15.
This core metal 20 is divided into left and right halves.

The left and right divided bodies 21.21 are molded in the same shape,
The core metal 20 is constructed by arranging the divided bodies 21 and 21 in opposite directions and facing each other on the same line. Each divided body 21 is formed by connecting a horizontal portion 22 extending in the width direction of the main body 11 and a shield portion 23 bent upward from the horizontal portion 22. In this case, the sigilder portion 23 extends within the upright portion 15 of the main body 11 and reinforces the upright portion 15. Further, the distal end portion of the horizontal portion 22 is cut out in an inclined shape, and the left and right divided bodies 21 are arranged to face each other so that the notched surfaces 24 at the distal end portions overlap in a parallel state. By arranging the left and right divided bodies 21 in a ramped manner in this manner, it is possible to impart a predetermined strength to the main body 11 even if the core bar 20 is divided. Since the core metal 20 is divided into left and right parts, the main body 11 has flexibility to bend appropriately at the divided parts,
This makes it possible to prevent wheels from coming off when turning, as will be described later. The reinforcing cord 13 is embedded in the longitudinal direction of the main body 11 so as to be located below the core bar 20 to prevent the main body 11 from elongating.

Next, the operation of this embodiment will be explained.

FIG. 5 shows a turning state in which the crawler 10 of this embodiment is mounted, and the tires 4 are tilted in the turning direction (to the right) due to steering. Due to this inclination, the tire 4 presses the upright portion 15 of the main body 11 located on the turning side (right side). Since the main body 11 is given strength by the core metal 20 provided inside, it can resist this pressing force. In this state, the core metal 20 is divided into left and right parts, and the right-hand divided body 21 receives the pressing force of the tire 4, but this pressing force is difficult to be transmitted to the left-hand divided body 21. Furthermore, the main body 11 has appropriate flexibility due to the division of the core metal 20. As a result, when the pressing force of the tire 4 acts on the right side, the right half of the main body 11 bends to maintain contact with the road surface, so it is possible to secure a contact area with the road surface. It has the ability to follow the tires 4 and can prevent the wheels from coming off the tires 4.

Figure 6 is a characteristic diagram plotting changes in the ground contact area of the crawler against the load from the tires during turning.
Characteristic curve A represents this embodiment in which the core metal is divided;
1 shows a conventional example in which the core metal is continuous. Compared to the conventional example, this example has a smaller variation in ground contact area and is less likely to come off the wheel. In addition, since the core metal is split and the main body is flexible, even if the tire rides on the crawler, the crawler's elongation in the axial direction is reduced, making it even more difficult for the tire to derail. There is. FIG. 7 shows the measurement of the tension of the crawler against the load that causes the tire to run off, and the characteristic curve A shows this embodiment, and the characteristic curve B shows the conventional example. The amount of elongation of the crawler is proportional to its tension, and since the tension of this example is smaller as shown in the characteristic curve kIAA, it can be seen that the amount of elongation of the crawler of this example is smaller. It can be seen that it is difficult for the wheels to come off under heavy loads. Therefore, by dividing the core metal as described above, wheel derailment is less likely to occur and turning performance can be improved. In addition, the weight of the core metal is reduced, making it possible to reduce the weight of the crawler as a whole, thereby improving the ease of handling.

8 to 10 respectively show other embodiments of the present invention,
Elements that are the same as those in the previous embodiment are denoted by the same reference numerals and correspond to each other, and redundant explanation will be omitted. The embodiment shown in FIG. 8 is the same as the previous embodiment in that the tip portions of the divided bodies 21 of the core bar 20 are cut out, and the opposing tip portions are wrapped, but each of the divided bodies of the core bar 20 is 2I Auxiliary core bar 25 on the outer surface
is installed. This auxiliary core metal 25 is formed into an rLJ shape, and its upper part is welded to the outer surface of the shoulder portion 23 of the divided body 21. The bent lower portion faces outward from the main body 11. The provision of the auxiliary core bar 25 increases the rigidity of the core bar 20, which has the advantage of increasing the strength of the upright portion 15 of the main body 11, and also because the core bar 20 is divided as in the previous embodiment. , wheel derailment is less likely to occur and turning performance is improved.

The embodiment shown in FIGS. 9 and 10 is a divided body 2 of a core bar 20.
In the embodiment shown in FIG. 9, which does not have a wrap portion at the opposing ends of the metal core 20, the divided body 21 of the core bar 20 is formed into an inverted rTJ shape, and the extending portion 26 is formed on the outside of the horizontal portion 22. It was formed. Further, a vertical rib portion 27 is formed on the extending portion 26 and the shoulder portion 23, and the strength of the standing portion 15 of the main body 11 is increased by the extending portion 26 and the lip portion 27. The effect of dividing the core metal 20 is also the same as that of the previous embodiment.

In the embodiment shown in FIG. 10, the divided body 21 of the core bar 20 is formed into a thick rLJ shape, and by increasing the wall thickness, the rigidity of the core bar 20 is increased and the strength of the main body 11 is increased. In addition to the advantages, the effect of dividing the core metal 20 is the same as that of the previous embodiment.

〔Effect of the invention〕

As explained above, in the present invention, the core metal embedded in the main body is divided and made independent, and the main body is made flexible, so that it is possible to prevent the wheels from falling off when turning. , which has the effect of improving turning performance.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIGS. 2 and 3 are a plan view and a side view thereof, and FIGS. Figure 5 is a cross-sectional view showing the turning state of the tire according to this embodiment, Figure 6 is a characteristic diagram showing changes in the ground contact area of the crawler with respect to the tire load, and Figure 7 is the tension of the crawler in response to the load that causes derailment. 8 to 10 are cross-sectional views showing other embodiments of the present invention, FIG. 11 is a side view showing the crawler installed state, and FIG. 12 (al indicates a conventional crawler). Cross-sectional view (1) is a cross-sectional view showing a turning state of a tire by a conventional crawler. 4... Tire, 10... Crawler, 11... Main body, 20... Core bar, 21...Divided body. Patent applicant Honda Motor Co., Ltd. Figure 3 Figure 2 Figure 4 (0) 1 (b) Figure 5 Low center e + h To m8 (Δ) Hero center 0 Customer training area (Shima Figure 8 1 3 1 j 1 Figure 9 Figure 10 1 2 6 1 6 2 1 Figure 11 Figure 12 (0) (b)

Claims (1)

[Claims] A main body formed of an elastic body into an endless shape having a width that covers the tread of the tire and whose both ends in the width direction are bent in the direction of the tire; 1. A crawler comprising a core metal buried at a predetermined pitch in the direction, and the core metal is divided into left and right parts approximately at the center in the length direction.