JP2019182099A - Crawler - Google Patents

Abstract

To provide a crawler structure that appropriately releases heat from the inside of an elastic body, reduces heat generated on the running surface of wheels, and prevents an influence on running of a crawler.SOLUTION: A crawler 20 includes an endless elastic body EL, tension members 2 circumferentially embedded, and lugs 9 on the outer circumferential side. The crawler is configured such that wheels 8 run on the inner circumferential side. A portion of flexible sheets 6 having heat conductivity higher than that of the elastic body EL is exposed toward the inner circumferential side of the crawler to serve as exposed portions 6a. Other portions continuously formed with the exposed portions 6a are embedded as embedded portions 6b between unvulcanized rubber plates to be the elastic body EL by vulcanization, thereby integrally forming a raw crawler in a vulcanized structure.SELECTED DRAWING: Figure 1

Description

The present invention relates to a crawler used in a traveling unit such as an agricultural machine or a construction machine.

In a crawler of a type in which a roller passes through an inner peripheral surface, the portion excluding the cored bar and the tensile body is generally made of an elastic body. The elastic body expands and contracts when it is wound around the sprocket or idler or falls due to the weight of the aircraft, and heat is generated accordingly. Since the inside of the elastic body is not easily cooled by air, its heat accumulates inside the elastic body, causing early cracks due to thermal aging of the elastic body and the core metal due to a decrease in the adhesive force between the elastic body and the core metal. It became a factor causing peeling of the elastic body, which had an effect on the crawler life. Moreover, in order to ensure the strength of the crawler main body, the wheel passing surface may be formed thick, and in that case, heat storage becomes easier. In particular, in a coreless crawler for the purpose of weight reduction, since most of the crawler is an elastic body, countermeasures for heat storage become a more important issue.

As an improvement measure against the above, for example, Patent Document 1 discloses a structure for reducing the winding resistance in order to prevent heat generation itself. Further, Patent Document 2 discloses a structure having a cooling effect by an air flow, and Patent Document 3 proposes a structure that radiates internal heat generation.

The crawler of patent document 1 forms the recessed part extended in the crawler width direction outer side from between the wing | blade parts adjacent to a crawler circumferential direction in the inner peripheral part of a crawler main body. In other words, the part where the compressive strain of the crawler body becomes large is removed from the wound part. Thereby, the compressive strain generated between the adjacent core bars of the crawler main body in the winding portion is alleviated, and as a result, heat generation between the adjacent core bars of the crawler main body during traveling is suppressed.

The crawler of Patent Document 2 is formed on the inner peripheral surface of the crawler in which the roller passing portion is formed. The crawler is formed outside the crawler width in the crawler width direction and inside the end in the crawler width direction. A plurality of dents are provided in the recessed portion at intervals in the circumferential direction of the crawler and extend from the end side in the crawler width direction toward the wheel passage passing portion. Since the air flows from the end side of the rubber elastic body toward the wheel passing portion along the line, it can be cooled.

The crawler of Patent Document 3 is a rubber crawler in which a roller rolls on an inner peripheral surface, and the endless rubber elastic body includes a roller that rises from the inner peripheral surface of the endless rubber elastic body outward in the width direction of the guide protrusion. Each of the rolling surfaces on which the wheel rolls is formed, and the width of the portion corresponding to the core metal that is likely to generate heat in a plan view on the inner peripheral side of the rubber crawler is narrower than the portion corresponding to the core metal. Thus, a structure excellent in heat dissipation is obtained, rubber aging is extremely reduced, and the life of the rubber is remarkably improved.

Japanese Patent No. 5565866 Patent No. 5758421 Japanese Patent No. 4608296

In any of the above structures, the mold needs to be changed, and the number of man-hours at the initial stage increases. Therefore, it is more efficient if the existing mold can be used continuously.
Therefore, the present invention is a crawler of the type in which the wheel passes on the inner peripheral surface side, and suitably releases the heat inside the elastic body without using a method that requires a mold change as described above. It is an object of the present invention to provide a crawler structure that reduces surface heat generation on a running surface of a wheel and does not affect the crawler travel.

In order to solve the above problems, the present invention is an endless elastic body and a crawler in which a tensile body is embedded in the circumferential direction, has a lug on the outer peripheral side, and a wheel runs on the inner peripheral side, A part of the flexible sheet having a higher thermal conductivity than the elastic body is exposed to the inner peripheral side of the crawler to be an exposed portion, and other than the unvulcanized rubber plate that becomes the elastic body by vulcanization, the continuous portion is connected to the exposed portion. It is characterized by having a structure in which a raw crawler is embedded by vulcanization to embed this part. The heat inside the crawler is suitably released by the thermal conductivity of the flexible sheet.

Further, by using a sheet having a low friction property and a fabric-like sheet as the flexible sheet, the exposed portion includes a wheel running surface, so that the friction between the crawler inner peripheral surface and the wheel is made. This reduces the surface heat generation due to.

In the present invention, the crawler inner peripheral surface can be configured to suitably release the heat inside the crawler by a flexible sheet having low friction, and to reduce surface heat generation on the wheel running surface, By making the flexible sheet into a fabric shape or a sheet shape, the winding resistance due to the arrangement of the flexible sheet is kept to a minimum, and the crawler excellent in durability can be provided without affecting the running of the crawler. Is. In addition, when a flexible sheet | seat has a micro clearance gap, adhesiveness improves because unvulcanized rubber penetrate | invades there.

It is a figure which shows the crawler which concerns on 1st Example, FIG. 1A shows an internal peripheral surface, FIG. 1B shows AA cross section, FIG. 1C has shown the modification, respectively. It is a figure which shows the crawler which concerns on 2nd Example, FIG. 2A shows an internal peripheral surface, FIG. 2B shows the BB cross section, FIG. 2C shows the internal peripheral surface of a modification, FIG. 2D shows CC cross section, respectively. . It is a figure which shows the crawler which concerns on 3rd Example, FIG. 3A has shown the internal peripheral surface, FIG. 3B has each shown DD cross section. It is a figure which shows the crawler which concerns on 4th Example, FIG. 4A has shown the internal peripheral surface, FIG. 4B has each shown EE cross section. It is a figure which shows the crawler which concerns on 5th Example, FIG. 5A shows an internal peripheral surface, FIG. 5B shows the internal peripheral surface of a modification, and FIG. 5C has each shown FF cross section. It is a figure which shows the crawler belt which concerns on 6th Example, FIG. 6A has shown the internal peripheral surface, FIG. 6B has each shown GG cross section. It is various modifications of the crawler which concerns on 1st Example, and FIG. It is an example which shows the embedding depth of an embedding part. It is a figure which shows the cross section of a crawler, FIG. 9A has shown the circumferential cross section, FIG. 9B has shown the HH cross section, and FIG. 9C has each shown the metal core less crawler. It is a figure which shows the assembly condition of a raw crawler.

The crawler has an endless elastic body and a tensile body embedded in the circumferential direction, has a lug on the outer peripheral side, and a wheel runs on the inner peripheral side. The elastic body, which is the main material of the crawler, generates heat when it is wound around a sprocket or idler or due to a compressive strain caused by a drop due to the weight of the body due to a wheel. FIG. 9 shows a crawler 80 having cored bars 1 arranged at regular intervals in the circumferential direction. The crawler has a wheel running surface (a range indicated by reference numeral 5 in the drawing) on which the wheel runs, over the circumference of the crawler 80. The crawler 80 is provided with lugs 9 at a predetermined period on the contact surface side. Since the crawler 80 has the tensile body 2 and the tensile body 2 does not expand, the elastic body EL on the inner peripheral side of the tensile body 2 is compressed when wound around the sprocket or idler. It will be. 9B, when the thickness of the elastic body EL up to the tensile body 2 on the lower side of the wheel running surface 5 is viewed as a thickness of one crawler, the cored bar 1 is present. The thickness h3 of the part is thin, and the thickness h4 between the metal cores is thick. Since the core metal 1 hardly deforms, the deformation at the time of winding around the sprocket or idler occurs exclusively in the elastic body EL between the core metal 1 and the core metal 1. Since the thickness h4 of this portion is thicker than h3, heat due to compressive strain is not easily released. On the other hand, at the position of the cored bar 1, the elastic body EL is thin and is in contact with the metal that is a heat conductor, so that heat hardly accumulates.

On the other hand, in the case of a crawler without a metal core (core metal-less crawler) 90 (FIG. 9C), the compressive deformation at the time of winding on a sprocket or idler is affected by the drive protrusion 10 or lug 9, but the metal core. It occurs in substantially the same way in one revolution of the rescue roller 90. On the other hand, the location where the drive protrusions 10 are present is particularly thick in the elastic body EL, and compression heat is not easily released.

The present invention provides a flexible sheet having a higher thermal conductivity than that of the elastic body EL with respect to a portion which is on the inner peripheral side of the tensile body and where the thickness of the elastic body EL is increased over the circumference of the crawler. It is embedded and a part of the flexible sheet is exposed on the crawler surface to release the heat generated by the compressive strain of the elastic body. Alternatively, in a crawler having a cored bar, the heat generated by the compressive strain of the elastic body EL is released by bringing the embedded flexible sheet into contact with the cored bar.

In the production of the crawler, as is well known, a raw crawler assembled with the unvulcanized rubber plate GM, the core metal 1, and the tensile body 2 as parts is placed in a mold and vulcanized. In FIG. 10, the assembly condition of the raw crawler in this invention is shown. As shown in FIG. 10, at the stage of assembling the foldable flexible sheet 6 on the raw crawler, it is embedded by being inserted between unvulcanized rubber plates GM. Since the flexible sheet 6 is flexible, it can be freely bent following the shape of the surface of the rubber plate GM. At this time, a part of the flexible sheet 6 is exposed on an unvulcanized rubber plate GM disposed on the inner peripheral side (exposed part), and the other part continuing to the exposed part is unvulcanized. Fold and embed between the rubber plates GM (embedding part). Then, it integrates by vulcanization. In the drawing, GS indicates a rubber plate including the tensile body 2. In the manufactured crawler, the unvulcanized rubber plate GM becomes an elastic body EL by vulcanization, a part of the flexible sheet 6 is exposed on the inner peripheral surface side, and a part is embedded in the elastic body EL. Is done. As described above, according to the present invention, it is possible to continue using an existing mold without any need to change the mold.

In the present invention, the flexible sheet 6 has a higher thermal conductivity than the elastic body EL constituting the main part of the crawler. For example, a cloth of TORAYCA (registered trademark No. 1021495 of Toray Industries, Inc.) or the same prepreg Such as carbon fiber such as carbon fiber and capron fiber (registered trademark No. 4717720 of Seiho Co., Ltd.), fabric like metal cord weaving, or metal sheet, sillpad SP (Kitakawa Industries) with thermal conductivity Co., Ltd.) and Gap Pad GP1 (Kitakawa Kogyo Co., Ltd.) and other silicone sheets, and Parel (registered trademark No. 843135 of Toray Industries, Inc.) and other polymer sheets, etc. that have thermal conductivity or antistatic properties. It is possible to use it regardless. In addition, if it has low friction properties, such as carbon fiber or metal sheet, surface heat generation can be reduced, and further, an effect of preventing heat storage can be obtained. Also, copper is known to adhere firmly by vulcanization, but it has excellent flexibility and workability like a copper fiber sheet and has a structure that does not affect the crawler's running if it is lightweight. Is possible.

Embodiments of the present invention will be described below with reference to the drawings. In the drawing, the thickness of the flexible sheet 6 may be much thinner than the thickness appearing in the drawing depending on the material selected as the flexible sheet 6.

FIG. 1 shows a crawler 20 according to a first embodiment of the present invention. FIG. 1A is a diagram illustrating an inner peripheral surface of the crawler 20. A flexible sheet 6 having a high thermal conductivity that is continuous over the entire circumference is disposed as an integral part of the vulcanization so as to be exposed on the inner circumference side of the crawler 20 on the roller running surface 5 on the inner circumference side of the crawler 20. The flexible sheet 6 is preferably a fabric or a sheet having low friction. The length of the exposed portion 6a in the crawler width direction W is a surface including at least the total length that contacts when the wheel 8 travels.

1B, both end portions of the flexible sheet 6 in the crawler width direction W are embedded in the elastic body EL to constitute an embedded portion 6b. The lug 9 is disposed immediately below the cored bar 1. With this configuration, the heat accumulated inside the elastic body EL between the core bars 1 is preferably radiated from the exposed surface of the exposed portion 6a to the atmosphere via the flexible sheet. Since the flexible sheet 6 is also disposed at the location of the cored bar 1, the heat accumulated inside the elastic body EL at the location can also be dissipated. In addition, by burying the end portion of the flexible sheet 6 in the elastic body EL and forming the embedded portion 6b, the flexible sheet 6 arranged as a vulcanized integral is prevented from peeling off from the end portion.

As shown in FIG. 7A, the embedded portion 6b of the flexible sheet 6 may be embedded in a bellows shape. Further, as shown in FIG. 7B, the notch in the crawler width direction W is periodically inserted into both ends of the flexible sheet 6, and the adjacent notches are shifted in the crawler width direction W to embed to constitute the embedded portion 6b. Thereby, adhesiveness with the elastic body EL can be improved.

Further, the inner and outer ends of the flexible sheet 6 in the crawler width direction W may be continuous. For example, the flexible sheet 6 is formed in a cylindrical shape like the crawler 20 ′ shown in FIG. A portion of the sheet 6 is exposed to the wheel running surface 5 to form an exposed portion 6a, and the other portion is embedded in the crawler body with the elastic body EL filled in the interior surrounded by the flexible sheet 6. It is also possible to create a raw crawler as the embedded portion 6b and vulcanize it. As a result, more flexible sheets 6 are embedded in the crawler, and the adhesive strength increases.

With the above configuration, the heat accumulated in the elastic body EL is transmitted from the embedded portion 6b to the exposed portion 6a via the flexible sheet 6, and can be released into the atmosphere. Alternatively, if the sheet-like low-friction flexible sheet 6 is used, there is an effect that the surface friction on the wheel running surface 5 can be reduced by the exposed portion 6a.

FIG. 2 is a view showing a crawler 30 according to a second embodiment of the present invention. By embedding the flexible sheet 6 continuously in the elastic body EL over the entire circumference in the circumferential direction L of the crawler 30, an embedded portion 6b is illustrated. And one or both ends of the flexible sheet 6 in the crawler width direction W are exposed on the inner peripheral surface of the crawler to form an exposed portion 6a, which is arranged as a vulcanized unit.

FIG. 2A is a view of an example in which the exposed portion 6a is configured by exposing both of the crawler width direction W of the flexible sheet 6 to the crawler inner peripheral surface, and FIG. 2B is a cross-sectional view taken along the line BB. FIG. The ends of both sides of the flexible sheet 6 in the crawler width direction W are exposed on the inner peripheral surface of the crawler 30. The buried portion 6b is buried near the center in the thickness direction of the elastic body EL on the lower side of the wheel running surface 5, and the exposed portion 6a creates a raw crawler in a state where the wheel running surface 5 is exposed and disposed. Unify vulcanization.

FIG. 2C is an example in which one of the flexible sheet 6 in the crawler width direction W is exposed on the inner peripheral surface of the crawler to form an exposed portion 6a, and FIG. 2D is a cross-sectional view taken along the line CC. One end of the flexible sheet 6 in the crawler width direction W (in this example, the outside in the crawler width direction) is exposed on the inner peripheral surface of the crawler 30 ′. Others are the same as the example of FIG. 2B. Further, since the exposed portion 6a is not affected by the friction caused by the rolling wheels 8, it can be prevented from being peeled off. Note that the end of the flexible sheet 6 may be exposed only on one side inside the crawler width direction in the crawler width direction W.

With the configuration shown in the second embodiment, the heat accumulated in the elastic body EL is transmitted from the embedded portion 6b to the exposed portion 6a and is radiated to the atmosphere. Further, since the exposed portion 6a is not affected by the friction caused by the rolling wheels 8, it can be prevented from being peeled off.

With the above configuration, the heat accumulated near the center of the elastic body EL can be suitably transmitted to the exposed portion 6a, and the exposed portion 6a is located at a position excluding the wheel running surface 5, so that the flexible sheet 6 rolls. The life of the flexible sheet 6 is extended because it is not affected by the friction caused by the ring 8 and can be prevented from peeling from the end.

FIG. 3 is a view showing a crawler 40 according to a third embodiment of the present invention, and FIG. 3A shows an inner peripheral surface of the crawler 40. In the present embodiment, the exposed portion 6 a of the flexible sheet 6 is embedded so as to include at least the range of the roller running surface 5 on the inner peripheral side of the crawler 40 and overlapping the projection surface of the cored bar 1. The The embedded portion 6 b of the flexible sheet 6 is embedded between the core bars 1. The flexible sheet 6 is continuous over the entire circumference of the crawler 40 and is disposed as a vulcanized unit. At this time, the length of the flexible sheet 6 in the crawler width direction W is a length including at least the wheel running surface 5.

According to the said structure, the heat | fever between the metal cores 1 can be suitably discharge | released in air | atmosphere from the exposed part 6a by arrange | positioning the embedded part 6b between the metal cores 1 which are easy to store heat. Further, if a cloth-like or low friction sheet is used as the flexible sheet 6, surface heat generation due to friction when the roller 8 travels on the core metal 1 on the exposed portion 6a can be reduced.

3B is a cross-sectional view taken along the line DD, and a portion of the flexible sheet 6 corresponding to the space between the core bars 1 is embedded in the main body of the crawler 40 to form an embedded portion 6b. The burying depth of the burying portion 6 b is preferably arranged so that the deepest portion is on the inner peripheral side of the tensile body 2. By this structure, there exists an effect which prevents peeling of the flexible sheet 6 more effectively. Further, the end of the exposed portion 6a in the crawler width direction W may be embedded in the elastic body EL as in the first embodiment.

FIG. 4 shows a core bar-less crawler 50 according to a fourth embodiment of the present invention. The mandrel-less crawler 50 is different from the crawlers 20, 30, and 40 described above, and does not have the mandrel 1 that they have. FIG. 4A is a diagram illustrating an inner peripheral surface of the crawler 50. The cored metal less crawler 50 includes an embedded portion 6b below the drive protrusion 10 and an embedded portion 6b on both sides of the drive protrusion 10 in the crawler width direction W. The flexible sheet 6 is arranged so that the exposed portion 6a continuous to the surface appears. At this time, the length of the exposed portion 6 a in the crawler width direction W is a length including at least the wheel running surface 5.

FIG. 4B is a cross-sectional view taken along the line E-E, and the embedded portion 6 b is configured at the boundary portion between the main body of the core metal less crawler 50 and the drive protrusion 10. With this configuration, an exposed portion 6a is formed between the drive protrusions 10 in the crawler circumferential direction L.

In the case of the coreless crawler 50, since there is no cored bar, the inner peripheral side of the tensile body 2 is compressed due to the compressive strain immediately below the driving protrusion 10 or the weight of the body due to the wheels 8 when wound around the sprocket or idler. Generates heat due to compression strain caused by The drive protrusion 10 is formed of an elastic body EL (it may be the same material as or different from the elastic body EL of other portions), and the heat due to the compressive strain generated immediately below the drive protrusion 10 is thick. It is in a state where it is difficult to be released by the elastic body. The flexible sheet 6 takes heat in the embedded portion 6b and releases the heat in the exposed portion 6a continuous on the same plane.

Note that the embedded portion 6b is not necessarily provided on the same plane as the exposed portion 6a. What is necessary is just to penetrate between the front-end | tip of the drive protrusion 10 and the tension | tensile_strength body 2 in the thickness direction of the metal core crawler 50, and it is preferable that the center vicinity of the drive protrusion 10 is included. Furthermore, by forming the exposed portion 6a across the drive protrusion 10 in the crawler width direction W, when the flexible sheet 6 also has low friction, the friction with the rolling wheels 8 is reduced, and the surface Heat generation can be reduced. Further, by setting the end portion in the crawler width direction W as the embedded portion 6b, the compression heat generated on the lower side of the wheel running surface 5 can be suitably released into the atmosphere, and the end portion of the flexible sheet 6 Since it is hidden in the elastic body EL, the flexible sheet 6 itself is difficult to peel off.

Further, according to the above configuration, the embedded portion 6b is disposed in the drive protrusion 10 having the largest rubber thickness in the core metal less crawler 50, so that the core metal less crawler 50 is driven via the flexible sheet 6 when vulcanized. Heat can be transmitted to the inside of the protrusion 10 for vulcanization.

Furthermore, with respect to the embedded portion 6b of the sheet-like flexible sheet 6, the thickness can be reduced to reduce the cost. When the fabric-like flexible sheet 6 is selected as the flexible sheet 6, the amount of rubber entering the gap is increased and the adhesive strength is increased by forming the embedded portion 6b so that the surface area of the embedded portion 6b is larger than the exposed portion 6a. Increase.

FIG. 5 is a diagram showing a fifth embodiment of the present invention. 5A and 5B show the crawler 60 of the fifth embodiment and the inner peripheral surface of the crawler 60 'obtained by modifying the crawler 60, respectively. In the circumferential direction L of the crawlers 60 and 60 ', the flexible sheet 6 is divided and arranged in a discontinuous state. The flexible sheet 6 is positioned between the cored bars 1 and at least one end of the ends in the crawler width direction W is exposed to the inner peripheral surface of the crawler to form an exposed portion 6a, which is arranged as a vulcanized unit ( The crawler 60 exposed both ends, and the crawler 60 ′ exposed the end on the outer side in the width direction W). At this time, the embedded portion 6 b of the flexible sheet 6 may be embedded in the vicinity of the center in the thickness direction of the elastic body EL equivalent to the core metal 1, and the exposed portion 6 a may be formed on the inner peripheral surface of the crawler excluding the wheel running surface 5. preferable.

According to the said structure, the crawler bending resistance at the time of winding to a sprocket and an idler by arrange | positioning the flexible sheet | seat 6 can be reduced.

FIG. 5C is a cross-sectional view taken along line FF in FIG. 5B. In the present embodiment, the embedded portion 6b is formed near the center of the elastic body EL in the thickness direction equivalent to the cored bar 1. With this configuration, since the embedded portion 6b can be disposed near the center in the thickness direction of the elastic body EL without interfering with the core metal 1 between the core bars 1, it is possible to more easily store the heat from the portion in the elastic body EL that is most likely to store heat. It becomes possible to radiate heat suitably. In the present embodiment, the present invention is applied to the crawler having the cored bar 1. However, in the cored barless crawler, the elastic sheet EL is obtained by dividing the flexible sheet 6 in the crawler circumferential direction L and disposing it in a discontinuous state. The preferable heat dissipation effect is produced. Moreover, since the flexible sheet 6 is divided, the bending resistance of the crawler can be reduced.

FIG. 6 is a view showing a crawler 70 according to a sixth embodiment of the present invention. In the roller running surface 5 on the crawler inner peripheral surface side shown in FIG. The exposed portion 6a and the embedded portion 6b are formed in a ruled shape, and are arranged as a vulcanized unit. The length of the flexible sheet 6 in the crawler width direction W is a length including at least the wheel running surface 5.

FIG. 6B is a GG cross-sectional view, and the flexible sheet 6 is embedded in the crawler main body in a wavy shape with respect to the crawler circumferential direction L, and constitutes an exposed portion 6a and an embedded portion 6b. The burying depth of the burying portion 6b is preferably arranged such that the deepest portion on the cored bar 1 is inside the cored bar 1, and between the cored bars 1 is as deep as the cored bar 1 It is preferable to embed it. By this structure, there exists an effect which prevents peeling of the flexible sheet 6 more effectively. Further, the end portion of the exposed portion 6a in the crawler width direction W may be embedded in the elastic body EL as in the first embodiment.

According to the said structure, the heat | fever in the elastic body EL can be discharge | released suitably in air | atmosphere, Furthermore, the bending resistance at the time of being wound around a sprocket or an idler is reduced.

In the present invention, the embedding depth of the embedding part 6 b is arranged so that the deepest part is on the inner peripheral side of the tensile body 2. This is because if the embedment depth is too large and the flexible sheet 6 and the tensile body 2 are in a position where they are in contact with each other during pressing, the adhesive strength of the portion decreases and peeling occurs. Specifically, in the crawler having the cored bar 1, as shown in FIG. 8A, the length from the tip end portion of the guide protrusion to the end portion in the crawler width direction is w1, the wheel running surface 5 and the tensile body 2 are When the thickness of the elastic body EL is h1, the crawler width direction W is in the range of 1/3 to 2/3 of w1, and the crawler thickness direction H is 1/3 to 2 of h1. It is preferable that the deepest portion of the embedded portion 6b exists within a range between / 3. It is desirable that a part of the embedded portion 6b is embedded in substantially the center in the crawler width direction W and the thickness direction H in the left and right elastic bodies EL with the engaging portion 3 as the center. Moreover, it is desirable that the embedded portion 6b of the flexible sheet 6 is formed so as to have a relatively larger surface area than the exposed portion 6a. The film thickness of the flexible sheet 6 may be partially changed. In that case, the embedded portion 6b is preferably formed in a sheet shape thinner than the exposed portion 6a.

Further, in the positional relationship between the cored bar 1 and the flexible sheet 6, the flexible sheet 6 is brought into contact with a part of the cored bar 1, thereby making use of the thermal conductivity of the cored bar 1. It is also possible to dissipate heat from the exposed portion, for example, the engaging portion 3. In this case, the flexible sheet 6 may not have the exposed portion 6a.

In addition, in the said Example in this invention, although a pair of flexible sheet | seat 6 is arrange | positioned at the left-right outer side of the guide protrusion 4, it is not restricted to these examples, and the exposed part 6a covers a pair of left-right guide protrusion 4. By adopting such a configuration, it is possible to reduce friction at a contact portion with the sprocket and the idler. As described above, the embodiments may be combined, or the exposed portion 6a or the embedded portion 6b of the flexible sheet 6 may include the central portion in the crawler width direction or only on the left and right sides depending on the application and the crawler structure. Also good. Moreover, the area of the flexible sheet | seat 6 to be used should just be a magnitude | size which can comprise at least the exposed part 6a and the embedded part 6b, and adjusts suitably according to the size and the extent of exposure of a crawler.

The embedding method is not limited to the above, and the above two methods may be combined.

DESCRIPTION OF SYMBOLS 1 Core metal 2 Tensile body 3 Engagement part 4 Guide protrusion 5 Rolling wheel running surface 6 Flexible sheet 6a Exposed part 6b Embedded part 8 Rolling wheel 9 Lug 10 Driving protrusion 20, 20 ', 30, 30', 40, 60 , 60 ', 70, 80 Crawler 50, 90 Mandrel-less crawler EL Elastic body GM Rubber plate GS Rubber plate including tensile body

Claims (11)

An endless elastic body, a crawler in which a tensile body is embedded in the circumferential direction, has a lug on the outer peripheral side, and a wheel runs on the inner peripheral side, and has a higher thermal conductivity than the elastic body A part of the adhesive sheet is exposed to the inner peripheral side of the crawler to form an exposed portion, and another portion continuous with the exposed portion is embedded between the unvulcanized rubber plates that become the elastic body by vulcanization to form an embedded portion. A crawler characterized by a structure in which the crawler is integrated by vulcanization. The crawler according to claim 1, wherein a part of the embedded portion is embedded in a substantially central portion in the crawler width direction and the thickness direction of the left and right elastic bodies centering on the engaging portion. In the crawler having no cored bar, the flexible sheet has an embedded portion embedded in the drive protrusion and an exposed portion that is continuous with the embedded portion and exposed on both sides of the drive protrusion in the crawler width direction. The crawler according to claim 1 or 2. The crawler according to any one of claims 1 to 3, wherein the flexible sheet is a fabric-like structure having a low friction property, and the exposed portion includes a wheel running surface. The crawler according to any one of claims 1 to 3, wherein the flexible sheet is made of a member having a low friction property, and the exposed portion includes a wheel running surface. The crawler according to claim 4, wherein the embedded portion of the flexible sheet is formed so as to have a surface area relatively larger than that of the exposed portion. The crawler according to claim 5, wherein the embedded portion of the flexible sheet is formed in a sheet shape thinner than the exposed portion. The crawler according to claim 1, wherein the exposed portion and the embedded portion of the flexible sheet are continuous in the crawler width direction. The crawler according to claim 1, wherein the exposed portion and the embedded portion of the flexible sheet are continuous at least in the crawler circumferential direction. The crawler according to claim 1, wherein the flexible sheet is discontinuous in the crawler circumferential direction. An endless elastic body, a structure of a crawler in which a tensile body in the circumferential direction and a core metal are embedded at regular intervals, a lug is provided on the outer peripheral side, and a wheel runs on the inner peripheral side, the elastic body A flexible sheet having a higher thermal conductivity is embedded between the unvulcanized belt-like elastic bodies, and a raw crawler in which a part of the flexible sheet is in contact with the core metal is vulcanized and integrated. A crawler characterized by that.