JPH06270856A - Rubber crawled for paddy field - Google Patents

Abstract

PURPOSE:To provide on the market a rubber crawler for paddy field which is fitted to a mobile agricultural work machine and suitable for working on a paddy field and weak ground. CONSTITUTION:In a rubber crawler wherein core bars 2 are embedded at a specific interval in the cross direction in the middle between right and left side edges in a crawler main body 1 of relatively wide width, steel cords S are embedded in arrangement in the whole circumference in the outer circumferential sides of right and left wing parts of core bars 2 and lugs 1b are projectingly provided in the outer circumferential surfaces, reinforcement cores 3a, 3b of specific range length are embedded lengthwise in the crawler cross direction respectively at an upper part and lower part in the thickness direction of the crawler main body 1 within ranges from upper and lower positions of the right and left core bar wing parts to respective side edges.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet crawler rubber crawler which is mounted on a mobile agricultural work machine and is suitable for work on wet fields and soft ground.

[0002]

2. Description of the Related Art Conventionally, a rubber crawler for a wet field, which is mounted on a mobile agricultural machine such as a combine, has a relatively wide crawler width in order to maintain buoyancy in the wet field.
If the length of the cored bar is increased corresponding to the width of the crawler, the cost will increase significantly and the cored bar will not be made too long. Therefore, the length of the cored bar will be relatively short with respect to the width of the crawler. There is.

FIG. 4 is a cross-sectional view of an example of a conventional rubber crawler for wetlands. As shown in the figure, a cored bar 12 is circumferentially disposed inside a crawler body 11a made of a rubber elastic body. The steel cords S as circumferential reinforcing materials are embedded in the outer peripheral side of the wing portion 12a so as to be aligned over the entire circumference, and are embedded in the outer peripheral surface of the crawler main body 11a so that the lugs 11b project. ing. In the figure, w ₁₁
Is a crawler width, w ₁₂ is a core bar length, 11c is a central part of the crawler main body 11a which is a core bar embedded region, 11d is a side edge part, and the core bar length w is relative to the crawler width w ₁₁ .
_{Since 12} is relatively short, the width of both side edge portions 11d, 11d is wide.

[0004]

The central portion is not bent because the cored bar is buried therein, whereas the wider the side edge portion is, the easier it is to bend. Since both side edges bend upward due to the weight of the airframe being applied to the part, the crawler width becomes substantially narrow and the buoyancy decreases when the upward bending increases, so that the central portion supporting the airframe is reduced. The problem is that the vehicle will sink and the running resistance will increase, reducing the traction force. Also, due to the repeated upward bending, the outer circumference near the boundary between the central part and the side edge (the position corresponding to the edge of the core metal blade). There are problems that long cracks occur in the circumferential direction on the surface, and that edge cuts (cuts from the crawler width end toward the center) easily occur when obstacles hit the side edges.

As a measure for improving the above problems, increasing the length of the cored bar to correspond to the width of the crawler is not adopted because the cost is significantly increased as described above, and the side edges are hardly bent. In that case, the aircraft will be difficult to turn and the loss of driving force at the time of turning will be large, so it is necessary to bend the side edge appropriately.As an improvement measure considering these points, JP-A-56-2274,
There are those described in Japanese Patent Publication No. 59-24029 and Japanese Patent Publication No. 2-9990.

By the way, the conventional rubber crawler for wetlands has been used for cutting rice in a relatively flat farmland, but in recent years, a backhoe or the like has been used as a mobile farming machine for excavating farmland. In addition to the above-mentioned problems, the rubber crawler for wetlands mounted on these machines also falls over while maintaining the stability of the machine during excavation work in a work place with many obstacles such as steps and uneven surfaces. It is necessary that it does not cause an accident. The present invention is intended to solve these problems by a new invention that is not described in the above publications or the like.

[0007]

A feature of the present invention is that a cored bar is embedded in the middle of the left and right side edges of a crawler body at regular intervals in the crawler width direction and the outer circumference of the left and right blades of the cored bar. In a rubber crawler in which steel cords are aligned and embedded along the entire circumference and lugs are projected on the outer peripheral surface, the crawler main body in the range from the upper and lower positions of the left and right cored bar blades to the side edges, respectively. The reinforcing cores having a length within the range are embedded in the crawler width direction in the upper and lower portions in the thickness direction, respectively.In this case, the ends of the upper and lower reinforcing cores on the crawler width end side are located in the side edges. Therefore, it is better to place them closer to each other from above and below.

[0008]

In the present invention, the reinforcing cores 3a and 3b are the wings 2.
a and the side edge portion 1d firmly bonded to each other via a thin rubber layer.
Since an appropriate space is provided in the inside of the upper and lower sides, the upper and lower reinforcing cores work together to enhance rigidity and resilience, making it difficult to bend the side edge 1d and the resilience. Of the reinforcing core 3a,
By arranging the end portion of the crawler width end side of 3b close to the vertical middle position, the blade portion 2a and the upper and lower reinforcing cores 3 are arranged.
The a and 3b form a lateral triangular reinforcing structure, and the reinforcing efficiency is further increased.

[0009]

1A to 1C show an embodiment of a rubber crawler for wetlands according to the present invention, in which A and B are plan views of the outer peripheral side and the inner peripheral side, respectively, and C is a cross-sectional view in the width direction. 1 in the figure
Is a rubber crawler, 1a is a crawler body, 1b is a lug, 1
c and 1d are the central portion and side edges of the crawler body 1a, 2 is a cored bar, 2a, 2b and 2c are blades of the cored bar 2, projections for guiding the rolling wheels, and engagement with a drive sprocket. , H is an engaging hole at the tip of the drive sprocket, S
Is a steel cord, w ₁ is a crawler width, and w ₂ is a core bar length. As shown in the drawing, the core bar 2 is arranged side by side in the circumferential direction inside the crawler body 1a formed of a rubber elastic body. Embedded at regular intervals in the outer peripheral side of the wing portion 2a, a steel cord S as a circumferential reinforcing material is evenly embedded along the entire circumference, and a lug 1b is projected on the outer peripheral surface of the crawler body 1a. As shown in the figure, since the core metal length w ₂ is shorter than the crawler width w ₁ , both side edge portions 1d and 1d are wide, and the above construction is the same as that of the conventional product described above. .

In the figure, 3a and 3b are reinforcing cores embedded in the upper and lower sides of the side edge portion 1d, and in this embodiment, the same linear member as the steel cord S as the circumferential reinforcing member is predetermined. The length (reinforcement core length w ₃ ) cut is used, and as shown in the figure, the edges of the reinforcement cores 3a and 3b on the crawler center side are overlapped with the upper and lower portions of the wing portion 2a. (Overlapping width w ₂₃ ), each of which is long and buried in the crawler width direction (however, the lower part of the edge of the blade portion 2a is located below the steel cord S), while the end part on the crawler width end side is Each of them is arranged closer to the intermediate position from above and below.

[0011] The above configuration at by reinforcing core 3a, 3b are firmly bonded via the thin rubber layer at the wings 2a and overlapping width w _23, moderate vertically is and at the inside of the side edge portions 1d Since the upper and lower reinforcing cores cooperate with each other to enhance rigidity and resilience, it is difficult to bend and has good resilience, and therefore the side edge portion 1d is large. It does not bend and it bends moderately, and because it maintains a sufficient crawler width during work in wetlands and soft ground, there is no decrease in buoyancy and traction and the stability of the aircraft is good. , Since both side edges are appropriately curved, traveling turning is performed smoothly, and cracks on the outer peripheral surface near the boundary position between the central part and the side edge and edge cutting of the side edge are extremely caused. It is unlikely to occur, and If the ends of the strong cores 3a and 3b on the crawler width end side are arranged close to the upper and lower intermediate positions, the wing 2a
Also, the upper and lower reinforcing cores 3a and 3b constitute a lateral triangular reinforcing structure, and the rigidity and the resilience are further increased.

In the present embodiment, the reinforcing cores 3a and 3b are embedded over the entire circumference, but the present invention is not limited to this. As an example, the reinforcing core is on the outside of the core metal blade. It may be embedded in the side edge portion of the portion and not embedded in the outer portion between the cored bars, and the overlapping width between the reinforcing core and the cored bar wing may be the entire length of the cored bar wing. In addition to this, the length direction of the reinforcing core may be a direction intersecting the crawler width direction (bias direction), or the upper and lower reinforcing cores may intersect with each other. The reinforcing core that overlaps the lower part of the steel cord S below the blade protects the steel cord S from cuts and the like that occur on the outer surface of the crawler, and when the reinforcing core on the core metal blade is arranged in the bias direction, the crawler body Width of core metal inside The core metal peeling prevention and the swinging motion restraint.

By the way, it is preferable that the reinforcing cores 3a and 3b are embedded in the inside of the side edge portion 1d so that the reinforcing cores 3a and 3b have a small volume and are lightweight in order to minimize the increase in weight. In addition to the above steel cords, high tensile strength fiber cords such as aramid fiber, polyarylate fiber, carbon fiber, etc., and filaments of appropriate size formed of a composite of metal or plastic or reinforced plastic of high rigidity and elasticity. The body and the plate are used, and these are preliminarily embedded in parallel in an unvulcanized rubber sheet at predetermined intervals, and the side edge portion is used in the conventional rubber crawler press vulcanization molding process. It is embedded and molded at a predetermined position inside 1d.

2A and 2B are partial plan views on the inner peripheral side showing another embodiment of the present invention. In the embodiment shown in FIG. 2A, the reinforcing core 31a is almost the same as the wing portion 2a as shown. As a strip-shaped thin plate having the same width, it is embedded in the outer portion of the wing portion 2a. In FIG. B, the reinforcing core 32a is arranged as shown in the figure as being slightly narrower than half the width of the wing portion 2a. There is.

FIG. 3 is a widthwise partial sectional view showing still another embodiment, in which upper and lower reinforcing cores 33a and 33b are joined at their crawler width ends to each other at point p in the figure. According to this figure, the reinforcing cores 33a, 3
Since the three-sided structure is formed by connecting the three sides by the 3b and the wing portion 2a, the reinforcing effect is further increased.

[0016]

As described above, in the rubber crawler for wetlands according to the present invention, the reinforcing core is firmly adhered to the upper and lower sides of the core bar blade in the crawler body, and the inside of the side edge is inside. Since it is designed to have an appropriate space above and below,
The upper and lower reinforcing cores work together to enhance the rigidity and resilience, so that the left and right side edges do not bend significantly despite being wide, and they bend appropriately. Since sufficient crawler width is maintained during work in wetlands and soft ground, there is no decrease in buoyancy and traction and stability of the aircraft is improved, work safety is increased, and both side edges are moderate. Since it bends into a curved shape, the vehicle turns smoothly, and it is extremely unlikely that the outer peripheral surface is cracked near the boundary position between the central portion and the side edge portion or the side edge portion is cut off. Increased durability.

Further, in the arrangement in which the end portion of the reinforcing core inside the side edge portion on the crawler width end side is brought close to the upper and lower intermediate positions, the metal bar blade portion and the upper and lower reinforcing cores are arranged in a horizontal direction. The rigidity and the resilience are further increased by forming a rectangular reinforcing structure.

[0018]

[Brief description of drawings]

FIG. 1 shows an embodiment of a rubber crawler for wetlands of the present invention, in which A is an outer peripheral side plan view, B is an inner peripheral side plan view, and C is a width direction sectional view.

FIG. 2 shows another embodiment of the rubber crawler for wetlands of the present invention, and A and B are partial plan views on the inner peripheral side.

FIG. 3 is a widthwise partial sectional view showing still another embodiment of the wetland rubber crawler of the present invention.

FIG. 4 is a widthwise cross-sectional view of an example of a conventional wetland rubber crawler.

[Explanation of symbols]

1 rubber crawler 1a, 11a crawler main body 1b, 11b lug 1c, 11c central part 1d, 11d side edge part 2, 12 core metal 2a, 12a wing part 2b, 12b protrusion 3a, 31a, 32a, 33a upper reinforcing core 3b, 33b Lower reinforcing core S Steel cord (as circumferential reinforcing material) H Engagement holes w ₁ , w ₁₁ Crawler width w ₂ , w ₁₂ Core bar width w ₃ Reinforcing core length w ₂₃ (Reinforcing core and core wing part Of) overlapping width

Claims (2)

[Claims] 1. A core bar is embedded in the width direction at regular intervals in the middle of the left and right side edges of a crawler body having a relatively wide width, and on the outer peripheral side of the left and right blades of the core bar. In a rubber crawler in which steel cords are aligned along the entire circumference and embedded, and lugs are projected on the outer peripheral surface, inside the crawler body in the range from the upper and lower positions of the left and right core metal blades to the side edges, respectively. A rubber crawler for wetlands, characterized in that reinforcing cores having a length within the range are embedded in the crawler width direction so as to be long in the thickness direction. 2. The rubber crawler for wetlands according to claim 1, wherein the end portions on the crawler width end side of the reinforcing cores embedded above and below in the thickness direction inside the crawler body are located inside the side edge portion. The rubber crawlers for wetlands are characterized in that they are arranged closer to each other from above and below.