JP2010132082A - Rubber crawler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber crawler suppressing vibration in traveling and having durability. <P>SOLUTION: The rubber crawler 1 attached to a crawler type traveling vehicle includes: a crawler body 3 formed in an endless belt shape by rubber; a plurality of core metals 2 having intervals in the circumferential direction of the crawler body and bringing its longitudinal direction in line with the width direction of the crawler body embedded in the crawler body; and a pair of rolling surface forming materials 4, 4 arranged on the inner circumference side in the crawler body with respect to the core metal, and each of which overlaps with the core metal in the circumferential direction on both sides of the core metals in the longitudinal direction. The rolling surface forming material includes: a rolling surface 19 exposed to the inner circumference side, and in which a rolling wheel of the crawler type traveling vehicle rolls; and a rocking shaft part 18 oppositely projected to the side the rolling surface faces to, and abutting on the core metal at the projected end. The projected end is rockably embedded in the crawler body around the width direction as an axis. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a crawler traveling type agricultural machine, a construction machine, and a rubber crawler mounted on a transport vehicle.

Agricultural work machines used in agricultural work, or civil engineering work machines and construction work machines used in residential land development, road construction, river maintenance, etc. are formed in endless belts in the circumferential direction (circulation direction) A rubber crawler having a cored bar embedded at equal intervals is mounted.
These crawler type traveling vehicles equipped with such rubber crawlers generate vibrations due to vertical movements when the rollers alternately pass over and between the cored bars, which causes noise. As a result, the worker feels uncomfortable.
In order to reduce vibration during traveling in the rubber crawler having a cored bar, a technique for forming a wheel running surface with a cushioning material such as rubber is disclosed (Patent Document 1).
JP 2002-166863 A

A rubber crawler in which a rolling wheel running surface as disclosed in Patent Document 1 is formed of an elastic body, for example, when mounted on a civil engineering work machine that runs on rough terrain, The pebbles, sand, etc. that get in between are embedded in the wheel running surface due to the load of the vehicle applied to the wheel, and worm erosion (chip cut) occurs on the wheel running surface and grows into a crack, reducing the durability of the rubber crawler. There is a problem of making it.
The present invention has been made in view of the above-described problems, and an object thereof is to provide a rubber crawler that can suppress vibration during traveling and has durability.

  A rubber crawler according to the present invention is a rubber crawler mounted on a crawler-type traveling vehicle, and has a crawler main body formed in an endless belt shape with rubber and a circumferential direction of the crawler main body, the longitudinal direction of which is A plurality of metal cores embedded in the crawler main body so as to coincide with the width direction of the crawler main body, and arranged on the inner peripheral side of the crawler main body with respect to the metal core, respectively on both sides in the longitudinal direction of the metal core A pair of rolling surface forming materials that overlap the core bar in the circumferential direction, the rolling surface forming material is exposed on the inner peripheral side, and the wheels of the crawler traveling vehicle roll. A rolling surface and a swinging shaft portion that protrudes on the opposite side to the side on which the rolling surface faces and the protruding end abuts against the core metal, and the protruding end swings about the width direction as an axis. The crawler body is movably embedded.

The rolling surface has a fold in the width direction and is bent so as to be concave with respect to the inner peripheral side, or a curved surface that is concave with respect to the inner peripheral side with a bus bar extending in the width direction. It is good.
The rolling surface forming material is formed of a synthetic resin, a synthetic resin reinforced with glass fiber or carbon fiber, or a metal.

  ADVANTAGE OF THE INVENTION According to this invention, the rubber crawler which can suppress the vibration at the time of driving | running | working and has durability can be provided.

1 is a view of the rubber crawler 1 viewed from the side opposite to the grounding side, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB in FIG.
In the following description, the grounding side of the rubber crawler 1 when mounted on a crawler type traveling vehicle is referred to as “outer peripheral side”, and the opposite side of the grounding side is referred to as “inner peripheral side”. Further, the direction in which the rubber crawler 1 circulates when the crawler type traveling vehicle travels is the “circumferential direction”, the direction orthogonal to the circumferential direction and parallel to the rotation axis of the wheel of the crawler type traveling vehicle is the “width direction” ".
1 to 3, a rubber crawler 1 includes a core metal 2,..., 2, a crawler main body 3, rolling surface forming materials 4,. It consists of 6 and 6 bodies.

The cored bar 2 is formed of a hard material such as metal. The core metal 2 includes a substantially long core metal body 11 and a pair of protrusions 12 and 12 as a whole.
The core metal main body 11 includes a central portion 13 that is thicker than the other portions, and wing portions 14 and 14 that extend from both sides of the central portion 13 to both ends in the longitudinal direction of the core metal 2. The wing portion 14 has a flat inner peripheral surface in a predetermined range from the vicinity of the end on the central portion 13 side to the end in the longitudinal direction. This plane is referred to as a rolling surface forming material support surface 15. The rolling surface forming material supporting surfaces 15 and 15 on both sides in the width direction exist in the same one virtual plane.

The projecting portions 12 and 12 are portions projecting inward from the boundary between the central portion 13 of the core metal body 11 and the wing portions 14 and 14 on both sides thereof. The projecting portion 12 has a tapered shape, and guides the wheels so that the rollers 7 do not fall off the rubber crawler 1 when the crawler type traveling vehicle travels. The cored bar 2 is embedded in the crawler body 3 at equal intervals in the circumferential direction so that the longitudinal direction thereof is the width direction in the crawler body 3.
The crawler body 3 is formed in an endless belt shape by joining both ends of a thick belt rubber. The crawler body 3 includes engagement holes 16,..., 16 penetrating the inner peripheral side and the outer peripheral side at the center in the width direction between the adjacent cored bars 2, 2 embedded. The engagement hole 16 is for engaging with the claw of the drive wheel of the crawler type traveling vehicle to which the rubber crawler 1 is mounted, and for circulating the rubber crawler 1 by rotation of the drive wheel.

The rolling surface forming material 4 is made of metal and includes a rolling surface portion 17 and a swing shaft portion 18.
The rolling surface portion 17 is a rectangular (rectangular) plate-shaped portion. The rolling surface portion 17 has a length L in the longitudinal direction larger than the width W of the rolling surface forming material support surface 15 in the wing portion 14 of the core metal 2 (which is a circumferential dimension in the rubber crawler 1). It is smaller than the pitch P of the core bars 2 and 2. In the metal core 2, the width W of the rolling surface forming material support surface 15 is substantially equal to the width of the other portion of the wing portion 14.
The oscillating shaft portion 18 is a band-like projecting portion that extends across both edges in the width direction (direction perpendicular to the longitudinal direction) on one surface of the plate-like rolling surface portion 17. The surface of the swing shaft portion 18 is a curved surface having a generatrix extending in the width direction of the rolling surface portion 17. The oscillating shaft portion 18 is arranged so as to be biased to one side in the longitudinal direction from the center in the longitudinal direction of the rolling surface portion 17.

The rolling surface forming material 4 has its longitudinal direction aligned with the circumferential direction of the rubber crawler 1, the rocking shaft portion 18 is brought into contact with the rolling surface forming material support surface 15 of the core metal 2, and the rolling surface portion 17. The surface 19 opposite to the surface from which the rocking shaft portion 18 protrudes is exposed to the inner peripheral side and is embedded in the crawler body 3. This “surface 19 opposite to the surface from which the rocking shaft portion 18 projects” is referred to as a rolling surface 19.
The rolling surface forming material support surface 15 has the same width (range) toward the longitudinal end of the metal core 2 as the length of the swing shaft portion 18 (also the width of the rolling surface portion 17). Or it is slightly larger than that, and can support the full length of the rocking | fluctuation shaft part 18. FIG.

The rolling surface forming material 4 is separate and independent from the core metal 2, and in the rubber crawler 1, the swing shaft portion 18 is arranged in the width direction of the rolling surface forming material support surface 15 (rubber crawler 1. In the circumferential direction). The rolling surface portion 17 of the rolling surface forming material 4 protrudes on both sides in the circumferential direction with respect to the wing portion 14 (the rolling surface forming material support surface 15) of the core metal 2 in the rubber crawler 1. Since the moving shaft portion 18 is biased to one side in the longitudinal direction of the rolling surface portion 17, the moving shaft portion 18 protrudes further to one side in the circumferential direction with respect to the wing portion 14 of the core metal 2.
The deviation of the extent of the rolling surface portion 17 in the circumferential direction differs in the protruding direction between the rolling surface forming members 4 and 4 on both sides in the width direction. That is, in the rubber crawler 1, one rolling surface portion 17 of the rolling surface forming members 4, 4 on both sides in the width direction that abuts on a single cored bar 2 greatly protrudes from the wing portion 14 in one of the circumferential directions. And the other rolling surface portion 17 protrudes larger than the wing portion 14 in the other circumferential direction.

From these facts, the core metal 2 and the rolling surface portion 17 of the rolling surface forming material 4 with which the rocking shaft portion 18 abuts on the rolling surface forming material support surface 15 of the core metal 2 are the circumference of the crawler body. It can be said that it overlaps the direction.
Moreover, when seeing the rubber crawler 1 as a whole, all of the rolling surface portions 17,..., 17 of the rolling surface forming members 4,..., 4 on one side in the width direction protrude to one side in the circumferential direction. In addition, the rolling surface portions 17,..., 17 of the rolling surface forming members 4,..., 4 on the other side in the width direction project to the other side in the opposite circumferential direction.

When the crawler type traveling vehicle equipped with the rubber crawler 1 travels, the rolling surface forming material 4 rolls on the surface exposed to the inner peripheral side of the rolling surface forming material support surface 15 so that the rolling wheel 7 rolls. The moving shaft 18 transmits the load to the cored bar 2 that supports the load of the crawler traveling vehicle or the like from the wheel 7.
The lugs 5, 5, and 5 protrude outward from the outer peripheral surface of the crawler main body 3, and a plurality of lugs are provided at equal intervals over the entire circumference.
The tensile body 6 is formed by arranging a plurality of tensile cords such as steel cords in a line in the width direction. The pair of tensile members 6 and 6 are embedded in the crawler body 3 in a state where the outer peripheral side of the wing portion 14 of the core metal 2 is wound over the entire circumferential direction.

In the rubber crawler 1 having the above-described rolling surface forming material 4 independent of the core metal 2, rubber is interposed between the core metal 2 and the rolling surface forming material 4, and the rolling surface forming material 4 is formed by the interposed rubber. The vibration when the rolling wheel 7 passes through the rolling surface 19 is absorbed, and the vibration due to the rolling surface 19 being made of metal is reduced. Further, the rubber crawler 1 having the rolling surface forming material 4 has the rolling surface 19 made of metal even when mud and sand enter between the rolling wheel 7 and the rolling surface 19. The rolling surface 19 is not easily damaged, and high durability can be expected.
Rolling surface forming material 4 is made of a material other than metal, such as urethane resin, ABS resin, ABS resin reinforced ABS resin reinforced with glass fiber or carbon fiber (FRP), or synthetic resin such as polyoxymethylene (POM). May be formed.

4 is a view of another rubber crawler 1B as seen from the inner peripheral side, and FIG. 5 is a cross-sectional view taken along the line CC in FIG.
The rubber crawler 1B has the same configuration as the rubber crawler 1 except that the rolling surface forming material 4B is different from the rolling surface forming material 4 in the rubber crawler 1. 4 and 5 and the following description, the same reference numerals as those of the rubber crawler 1 are used for portions having the same configuration as the rubber crawler 1, and the description thereof is omitted.
Similar to the rolling surface forming material 4, the rolling surface forming material 4 </ b> B includes a rolling surface portion 17 </ b> B and a swing shaft portion 18.

The rolling surface portion 17B is a rectangular (rectangular) plate-shaped portion. The length Lb of the rolling surface portion 17B in the longitudinal direction is larger than the width W of the rolling surface forming material support surface 15 in the wing portion 14 of the core metal 2 and smaller than the pitch P of the core metals 2 and 2.
The oscillating shaft portion 18 extends in a band shape substantially at the center in the longitudinal direction of the rolling surface portion 17B so as to protrude perpendicularly to the longitudinal direction between both ends in the width direction of the rolling surface portion 17B. The surface of the swing shaft portion 18 is a curved surface having a generatrix extending in the width direction of the rolling surface portion 17B.
The rolling surface forming material 4B has its longitudinal direction aligned with the circumferential direction of the rubber crawler 1B, the swing shaft portion 18 is brought into contact with the rolling surface forming material support surface 15 of the core metal 2, and the rolling surface portion 17B. The rolling surface 19B opposite to the surface from which the rocking shaft portion 18 protrudes is exposed to the inner peripheral side and embedded in the crawler body 3.

The rolling surface forming material 4B is independent of the cored bar 2. In the rubber roller 1B, the swing shaft portion 18 abuts the center of the rolling surface forming material support surface 15 in the width direction. Therefore, the rolling surface portion 17 </ b> B projects with substantially the same length on both sides in the circumferential direction with respect to the wing portion 14 of the core metal 2.
As with the rubber crawler 1, the rubber crawler 1B can be expected to have high durability and reduced vibration of the mounted crawler traveling vehicle.
6 is a view of another rubber crawler 1C as seen from the inner peripheral side, and FIG. 7 is a cross-sectional view taken along the line DD in FIG.

The rubber crawler 1C has two types of rolling surface forming materials, that is, a first rolling surface forming material 4Ca and a second rolling surface forming material 4Cb. The configuration of the other portions in the rubber crawler 1C is the same as that of the rubber crawler 1, and the same reference numerals as those of the rubber crawler 1 are used in FIGS.
The first rolling surface forming material 4Ca is composed of a rolling surface portion 17Ca and a swing shaft portion 18, and the second rolling surface forming material 4Cb is composed of a rolling surface portion 17Cb and a swing shaft portion 18.
The rolling surface portion 17Ca in the first rolling surface forming material 4Ca and the rolling surface portion 17Cb in the second rolling surface forming material 4Cb both have a rectangular plate shape. The length Lca of the rolling surface portion 17Ca in the longitudinal direction is larger than the width W of the rolling surface forming material support surface 15 in the blade portion 14 of the core metal 2 and smaller than the pitch P of the core metals 2 and 2. On the other hand, the rolling surface portion 17Cb has substantially the same width as the width of the rolling surface portion 17Ca (the distance between both end edges in the direction orthogonal to the longitudinal direction), and the length (in the direction orthogonal to the width direction). Lcb is smaller than the length Lca of the rolling surface portion 17Ca. The direction defining the length Lcb in the second rolling surface forming material 4Cb is referred to as “longitudinal direction (of the rolling surface portion 17Cb)” for convenience.

In each of the first rolling surface forming material 4Ca and the second rolling surface forming material 4Cb, the rocking shaft portion 18 rolls perpendicularly to the longitudinal direction at the substantially longitudinal center of the respective rolling surface portions 17Ca and 17Cb. The moving surface portions 17Ca and 17Cb extend in a band shape between both ends in the width direction. The surface of the oscillating shaft portion 18 is a curved surface having a generatrix extending in the width direction of the rolling surface portions 17Ca and 17Cb.
The first rolling surface forming material 4Ca has its longitudinal direction aligned with the circumferential direction of the rubber crawler 1, and the swing shaft 18 is brought into contact with one of the rolling surface forming material support surfaces 15 on both sides of the core metal 2. Further, the rolling surface 19Ca on the opposite side of the rolling surface portion 17Ca from the surface from which the swing shaft portion 18 protrudes is exposed to the inner peripheral side and is embedded in the crawler body 3.

The second rolling surface forming material 4Cb is made in the same manner as the first rolling surface forming material 4Ca by bringing the swing shaft portion 18 into contact with the other of the rolling surface forming material support surfaces 15 on both sides of the core metal 2. It is embedded in the crawler body 3. That is, the first rolling surface forming material 4Ca and the second rolling surface forming material 4Cb are the rolling surface forming materials on both sides (in the width direction of the rubber crawler 1C) of the same core 2 in the rubber crawler 1C. The support surfaces 15 and 15 are disposed on different inner peripheral sides.
Further, the first rolling surface forming materials 4Ca,..., 4Ca and the second rolling surface forming materials 4Cb,..., 4Cb are alternately arranged in the circumferential direction on both sides in the width direction of the rubber crawler 1C. It can be said that the surface forming materials 4Ca,..., 4Ca and the second rolling surface forming materials 4Cb,..., 4Cb are all arranged in a staggered manner in the circumferential direction.

It should be noted that the swing shaft portions 18, 18 of the first rolling surface forming material 4Ca and the second rolling surface forming material 4Cb are in contact with the center in the width direction of the rolling surface forming material support surface 15. .
As with the rubber crawlers 1 and 1B, the rubber crawler 1C can be expected to have high durability and reduced vibration of the mounted crawler traveling vehicle.
In the rubber crawler 1C, the swing shaft portions 18 and 18 of the first rolling surface forming material 4Ca and the second rolling surface forming material 4Cb are arranged in the center in the longitudinal direction of the respective rolling surface portions 17Ca and 17Cb. Instead, either or either of them may be arranged so as to be biased to one side in the longitudinal direction.

The first rolling surface forming materials 4Ca,..., 4Ca and the second rolling surface forming materials 4Cb,..., 4Cb are not arranged in a staggered manner in the circumferential direction, but as shown in FIG. Either one of the first rolling surface forming material 4Ca or the second rolling surface forming material 4Cb is arranged on either of the inner peripheral sides of the rolling surface forming material support surfaces 15 and 15 on both sides of the metal core 2. In the circumferential direction, the rubber crawler 1D may be formed so that the first rolling surface forming material 4Ca and the second rolling surface forming material 4Cb are alternately arranged.
In the rubber crawlers 1C and 1D, both the rolling surface 19Ca of the first rolling surface forming material 4Ca and the rolling surface 19Cb of the second rolling surface forming material 4Cb are on both sides in the circumferential direction with respect to the core metal 2. It is overhanging. The rolling surface 19Ca of the first rolling surface forming material 4Ca and the rolling surface 19Cb of the second rolling surface forming material 4Cb are formed so as to protrude from the cored bar 2 only in one circumferential direction, or The rolling surface 19Cb of the second rolling surface forming material 4Cb may be formed so as not to protrude on either side in the circumferential direction.

9 is a view of another rubber crawler 1E viewed from the inner peripheral side, and FIG. 10 is a cross-sectional view taken along the line EE in FIG.
The rubber crawler 1E has the same configuration as the rubber crawler 1 except that the rolling surface forming material 4E is different from the rolling surface forming material 4 in the rubber crawler 1. 9 and 10 and the following description, the same reference numerals as those of the rubber crawler 1 are used for portions having the same configuration as the rubber crawler 1, and the description thereof is omitted.
The rolling surface forming material 4E includes a rolling surface portion 17E and a swing shaft portion 18.

The rolling surface portion 17E has a rectangular plate shape, and as shown in FIG. 10, the rolling surface portion 17E has a crease 20E in the width direction at a position biased to one side in the longitudinal direction from the center in the longitudinal direction. One side is bent at the folding angle α toward the rolling surface 19E.
The rolling surface portion 17E has a length L in the longitudinal direction as viewed from the inner peripheral side, and the width W of the rolling surface forming material support surface 15 in the wing portion 14 of the core metal 2 (in the circumferential direction in the rubber track 1). Is smaller than the pitch P of the core bars 2 and 2.
The swing shaft portion 18 extends in a strip shape in the same direction as the direction in which the fold 20E extends while projecting at a position coinciding with the fold 20E on the rolling surface 19E on the surface opposite to the rolling surface 19E. The rocking shaft portion 18 is a curved surface having a generatrix extending in the width direction of the rolling surface portion 17E.

The rolling surface forming material 4E has its longitudinal direction aligned with the circumferential direction of the rubber crawler 1E, and the swing shaft portion 18 is arranged in the width direction of the rolling surface forming material support surface 15 of the core metal 2 (in the circumferential direction of the rubber crawler 1E). ), The rolling surface 19E is exposed to the inner peripheral side, and is embedded in the crawler body 3.
The rolling surface portion 17E of the rolling surface forming material 4E protrudes on both sides in the circumferential direction with respect to the wing portion 14 of the core metal 2 in the rubber crawler 1E. And since the rocking | fluctuation shaft part 18 is biased to one side of the longitudinal direction of the rolling surface part 17E, it protrudes largely by one side of the circumferential direction with respect to the wing | blade part 14 of the metal core 2. FIG.

Also, in the rubber crawler 1E, one rolling surface portion 17E of the rolling surface forming materials 4E, 4E on both sides in the width direction that abuts on one cored bar 2 greatly protrudes from the wing portion 14 in one of the circumferential directions. The other rolling surface portion 17 </ b> E protrudes greatly from the wing portion 14 in the other circumferential direction.
Also in the rubber crawler 1E, as in the rubber crawler 1, the rolling surface portions 17E,..., 17E on one side in the width direction protrude on one side in the circumferential direction, and the rolling surface portion 17E on the other side in the width direction. The moving surface portions 17E,..., 17E project to the other side in the opposite circumferential direction.

As with the rubber crawler 1 and the like, the rubber crawler 1E can be expected to have high durability and reduced vibration of the mounted crawler traveling vehicle.
The rolling surface portions 17E and 17E protrude in the circumferential direction on both sides in the width direction of the rubber crawler 1E with respect to one cored bar 2, and on the both sides in the width direction of the rubber crawler 1E with respect to one cored bar 2. The rubber crawler may be formed so that the rolling surface portions 17E and 17E protrude in the same direction.
The rolling surface portion 17E does not have a clear crease 20E as a line on the rolling surface 19E, but the rolling surface 19E may be formed so that two planes forming the fold angle α are continuous by a curved surface. Good.

Table 1 shows the rubber crawlers 1, 1 </ b> B, 1 </ b> C, 1 </ b> E having the rolling surface forming materials 4, 4 </ b> B, 4 </ b> E, or the first rolling surface forming material 4 </ b> Ca and the second rolling surface forming material 4 </ b> Cb. It is the result of examining the vibration at the time of driving | running | working of the insect crawler resistance and the mounted | worn crawler type traveling vehicle in the rubber crawler which does not have.

In Table 1, Example 1 is the rubber crawler 1 shown in FIGS. Example 2 is the rubber crawler 1B shown in FIGS. 4 and 5, Example 3 is the rubber crawler 1C shown in FIGS. 6 and 7, and Example 4 is the rubber crawler 1E shown in FIGS. .
Comparative Example 1 in Table 1 is a rubber crawler 51 shown in FIG. 11, and Comparative Example 2 is a rubber crawler 61 shown in FIG. 11 and 12, (a) is a view of the rubber crawlers 51 and 61 viewed from the inner peripheral side, and (b) is a cross-sectional view orthogonal to the circumferential direction of the rubber crawlers 51 and 61.

The rubber crawler 51 in the comparative example 1 is formed of the same rubber as the crawler main body 53 with the rolling surfaces 52 and 52 on which the rolling wheels 7 travel provided on the crawler main body 53.
The rubber crawler 61 in the comparative example 2 has a cored bar 64 provided with rolling surfaces 62 and 62 of the wheel 7.
The widths of the wings 14 of the core bars 2, 54, 64 in the rubber crawlers 1, 1B, 1C, 1E, 51, 61 are the same, and the core bars 2, 54, 64 embedded in the crawler bodies 3, 53, 63 are the same. The pitch P (the total circumference of the rubber crawler / the number of embedded core bars) P is also the same. The rubber crawlers 1, 1 </ b> B, 1 </ b> C, 1 </ b> E, 51, 61 exclude the presence / absence of the rolling surface forming material 4 and the like and whether or not the rolling surfaces 62, 62 are integrated with the core bars 2, 54, 64. The other shapes such as the shape and size of the cored bar and lug are formed to be the same.

The insect erosion resistance in Table 1 was investigated by attaching each rubber crawler 1, 1B, 1C, 1E, 51, 61 to a crawler type traveling vehicle and running. The investigation was performed by running the crawler-type traveling vehicle until worm-eaten was generated at the portion where the wheel 7 was rolling, and comparing the time (endurance time).
The evaluation of insect erosion resistance was determined by setting the durability time in Comparative Example 1 which is the rubber crawler 51 shown in FIG. 11 as 100, and comparing the values of other Examples and Comparative Examples with this value. . The higher the value of the insect erosion resistance, the longer the time until worm erosion occurs and the less worm erosion occurs.

  The vibrations in Table 1 are obtained by running a crawler type traveling vehicle equipped with each of the rubber crawlers 1, 1B, 1C, 1E, 51, 61, and the measured values of acceleration sensors installed on the crawler type traveling vehicle and the driver's experience. It was evaluated by. This evaluation was performed for a plurality of different drivers. The numerical value of the vibration in Table 1 is 100 in the case of the comparative example 1, and an increase in the vibration is recognized by the acceleration sensor as compared with the comparative example 1, and the case where the increase in the vibration can be experienced by a part of the driver is 95. The case where an increase in vibration was recognized by all the drivers was 90, and the case where a significant increase in vibration was recognized was 80.

From the results shown in Table 1, the rubber crawlers 1, 1B, 1C, and 1E provided with the rolling surface forming materials 4, 4B, and 4E that are independent from the core metal 2 are rolling with the rollers 7 rolling. It can be seen that the surface 52 is superior in durability compared to the rubber crawler 51 (Comparative Example 1) formed of rubber.
On the other hand, the rubber crawlers 1, 1B, 1C, and 1E use the rolling surfaces 19, 19B, 19Ca, 19Cb, 19E, etc. of the metal (or resin) rolling surface forming members 4, 4B, 4E, etc. Therefore, it is slightly inferior to the rubber crawler 51 (Comparative Example 1) in which the rolling surface 52 is made of rubber in terms of vibration. However, the rubber crawlers 1, 1 </ b> B, 1 </ b> C, and 1 </ b> E are greatly reduced in vibration compared to the rubber crawler 61 (Comparative Example 2) having the rolling surfaces 62 and 62 that are provided integrally with the core metal 64, and are resistant to insects. Considering the superiority of the characteristics, the degree of vibration is negligible.

FIG. 13 shows an example of the rubber crawler 1B taken as an example in which the vibration during traveling in the rubber crawlers 1, 1B, 1C, and 1E is reduced.
A crawler type traveling vehicle equipped with the rubber crawler 1B travels, and the wheel 7 moves from right above the rocking shaft portion 18 (rolling wheel 7a) of the rolling surface forming material 4B to the left side (M direction) in FIG. Then, due to the load applied from the rolling wheel 7 to the rolling surface 19B, the rolling surface forming material 4B swings so that the M direction side sinks with the portion of the swing shaft portion 18 in contact with the rolling surface forming material support surface 15 as a fulcrum. Move. The degree of the swing increases as the roller 7 moves away from the swing shaft portion 18, but the swing is caused by the rubber interposed between the rolling surface forming material 4 </ b> B and the cored bar 2. The degree of increase is small.

  When the rolling wheel 7 moves in the M direction and deviates from the rolling surface 19B (the rolling wheel 7b), it immediately rides on the rolling surface 19B in the rolling surface forming material 4B adjacent to the circumferential direction. At this time, the adjacent rolling surface forming material 4B is in a state of swinging to the opposite side at approximately the same level as the passing rolling surface forming material 4B. Therefore, the wheel 7 (7b) rides on the adjacent rolling surface 19B very smoothly, and the lowering of the wheel 7 is minimized. Then, as the rolling wheel 7 rides on the adjacent rolling surface 19B and rolls in the M direction, the degree of swing of the rolling surface forming material 4B gradually decreases, and the rolling wheel 7 rolls. When it reaches directly above the rocking shaft 18 in the moving surface forming material 4B (rolling wheel 7c), the rolling surface forming material 4B is in a neutral state.

In this way, when the roller 7 moves between the core bars 2,..., 2 in which the rollers 7 are arranged in the circumferential direction, the rubber crawler 1B is smoothly repeated without sudden changes in the degree of lowering and raising of the rollers 7. . The smooth raising and lowering of the rolling wheel 7 is similar to that in the rubber crawler 51 in which the rolling surface 52 in Comparative Example 1 is formed of rubber. For this reason, the rolling wheel 7 rolls on the metal rolling surface 19B. However, unlike Comparative Example 2, it is considered that an increase in vibration during traveling can be suppressed.
Such suppression of an increase in vibration during traveling in the rubber crawler 1B is common to the other rubber crawlers 1 and 1C to 1E.

In the rubber crawlers 1 and 1B to 1D, the rolling surface forming materials 4 and 4B, the first rolling surface forming material 4Ca, and the rolling surface portions 17B, 17Ca, and 17Cb of the second rolling surface forming material 4Cb are used as the rubber crawler 1E. As in the rolling surface forming material 4E in FIG. 4, a crease may be provided at a position corresponding to the rocking shaft portion 18 so as to be bent toward the inner peripheral side.
Further, the rolling surface forming materials 4 and 4B and the first rolling surface forming material 4Ca and the rolling surface portions 17 and 17B, 17Ca and 17Cb of the second rolling surface forming material 4Cb and the rubber in the rubber crawlers 1 and 1B to 1D, and rubber. The rolling surface forming material 4E in the crawler 1E is not bent at the rolling surfaces 19, 19B, 19Ca, 19Cb, 19E, but at the inner peripheral side where the generatrix extends in the width direction. It may be formed so as to have a gently curved surface.

  In the rubber crawlers 1, 1B to 1E, the rocking shaft portions 18 of the rolling surface forming materials 4, 4B, 4E, the first rolling surface forming material 4Ca, and the second rolling surface forming material 4Cb have curved surfaces. It is not limited to shape. The swing shaft portion 18 abuts on the rolling surface forming material support surface 15 of the core metal 2, and the projecting end of the swing shaft portion 18 extends in the width direction (longitudinal direction of the core metal 2) with respect to the rolling surface formation material support surface 15. As long as the shape is swingable, it may have another cross-sectional shape, for example, a cross-sectional shape of a substantially isosceles triangle. Further, the swinging shaft portion 18 may have a projecting end in contact with the rolling surface forming material support surface 15 instead of a continuous linear shape, or a continuous point or a continuous line. Note that “straight”, “point”, or “discontinuous line” for the protruding end means that the rolling surface forming material 4 when the rolling wheel 7 rolls on the rolling surfaces 19, 19B, 19Ca, 19Cb, 19E. , 4B, 4E, and the first rolling surface forming material 4Ca or the second rolling surface forming material 4Cb include those having a width in the circumferential direction that does not hinder smooth swinging.

The rolling surface forming materials 4B and 4E, the first rolling surface forming material 4Ca, and the second rolling surface forming material 4Cb are made of materials other than metal, such as urethane resin, ABS resin, ABS resin, etc., with glass fiber or carbon fiber. It can be formed from a reinforced ABS resin or the like (FRP) or a synthetic resin such as polyoxymethylene (POM).
In the above-described embodiment, each configuration of rubber crawlers 1 and 1B to 1E and rubber crawlers 1 and 1B to 1E, or the overall structure, shape, size, number, material, and the like are appropriately changed in accordance with the spirit of the present invention. be able to.

  INDUSTRIAL APPLICABILITY The present invention can be used for a rubber crawler mounted on a crawler traveling type agricultural machine, a construction machine, and a transport vehicle.

FIG. 1 is a view of the rubber crawler viewed from the side opposite to the grounding side. 2 is a cross-sectional view taken along line AA in FIG. 3 is a cross-sectional view taken along the line BB in FIG. FIG. 4 is a view of another rubber crawler as seen from the inner peripheral side. 5 is a cross-sectional view taken along the line CC in FIG. FIG. 6 is a view of another rubber crawler as seen from the inner peripheral side. 7 is a cross-sectional view taken along the line DD in FIG. FIG. 8 is a view of another rubber crawler as seen from the inner peripheral side. FIG. 9 is a view of another rubber crawler when viewed from the inner peripheral side. 10 is a cross-sectional view taken along the line EE in FIG. FIG. 11 is a schematic view of the rubber crawler of Comparative Example 1. FIG. 12 is a schematic view of a rubber crawler of Comparative Example 2. FIG. 13 is a diagram illustrating a state in which vibration during traveling in the rubber crawler is reduced.

Explanation of symbols

1, 1B to 1E Rubber crawler 2 Core 3 Crawler body 4, 4B, 4E Rolling surface forming material 4Ca Rolling surface forming material (first rolling surface forming material)
4Cb rolling surface forming material (second rolling surface forming material)
18 Oscillating shaft portion 19, 19B, 19Ca, 19Cb, 19E Rolling surface 20E Fold line

Claims (3)

A rubber crawler mounted on a crawler type traveling vehicle,
A crawler body formed in an endless belt shape with rubber;
A plurality of metal cores embedded in the crawler body with a distance in the circumferential direction of the crawler body and having the longitudinal direction thereof aligned with the width direction of the crawler body;
A pair of rolling surface forming materials that are arranged on the inner peripheral side of the crawler body with respect to the core metal and that overlap each other in the circumferential direction on both sides in the longitudinal direction of the core metal,
The rolling surface forming material is
A rolling surface that is exposed on the inner peripheral side and on which a wheel of the crawler traveling vehicle rolls;
A swinging shaft portion that protrudes on the opposite side to the side on which the rolling surface faces and whose protruding end abuts on the core metal,
The rubber crawler, wherein the protruding end is embedded in the crawler main body so as to be swingable about the width direction. The rolling surface is
2. A curved surface having a crease in the width direction and bent so as to be concave with respect to the inner peripheral side or a concave surface with respect to the inner peripheral side in which a bus bar extends in the width direction. The rubber crawler described. The rolling surface forming material is
The rubber crawler according to claim 1 or 2, wherein the rubber crawler is formed of a synthetic resin, a synthetic resin reinforced with glass fiber or carbon fiber, or a metal.