JP2019182027A - Rubber crawler - Google Patents

Abstract

To provide a rubber crawler capable of improving the durability of a tension member while suppressing an increase in bending rigidity.SOLUTION: A rubber crawler 1 includes: an endless belt-shaped crawler body 2 formed from rubber with a connection part 2a formed by mutual vulcanization connection of ends in the crawler peripheral direction; a core material 3 embedded in the crawler body 2, spacing in the crawler peripheral direction 'a' and formed from a harder material than rubber; and a tension member 4 embedded in a crawler outer-peripheral side co rather than the core material 3 of the crawler body 2, being adjacent to the core material 3 and used to apply tensile strength F to the crawler body 2. The rubber crawler 1 further includes: a reinforcement layer 7 which is embedded, being adjacent to the tensile member 4 and covers a substantially whole area in the crawler peripheral direction 'a' of the tensile member 4; and a protective layer 8 which is embedded in only a part thereof in the crawler peripheral direction 'a' including the connection part 2a of the crawler body 2 and is used to protect the reinforcement layer 7.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an endless belt-like rubber crawler.

  Conventionally, a crawler main body made of an elastic material such as rubber, a core material embedded in the crawler main body at a distance in the crawler circumferential direction and made of a material harder than rubber, and a crawler outer periphery than the core material of the crawler main body On the side, an elastic crawler is known that includes a tensile body embedded adjacent to a core material. For example, Patent Document 1 below includes a crawler body, a core material, and a tensile body as described above, and further includes a reinforcing layer that covers the crawler outer peripheral side of the core material and the tensile body on the outer side in the crawler width direction. An elastic crawler is proposed.

JP 2005-271710 A

  In the elastic crawler of Patent Document 1, end portions in the crawler circumferential direction are vulcanized and connected to form an endless belt-like crawler body. The vulcanized connection portion of the crawler main body has a complicated rubber movement during vulcanization, and may cause a gap in the reinforcing layer near the connection portion. For this reason, in the elastic crawler of Patent Document 1, when the rubber of the crawler main body is partially damaged, the damage may reach the tensile body through the gap between the reinforcing layers, and the durability of the tensile body is further increased. An improvement was desired.

  In order to improve the durability of the tensile body, for example, an improvement such as increasing the reinforcing layer can be considered. However, even if the reinforcing layer is enlarged, if a gap is generated in the reinforcing layer near the connection portion, it has not been possible to improve the damage of the tensile body from the gap. In addition, the increase in the size of the reinforcing layer has a problem that the bending rigidity when the elastic crawler is wound around the driving wheel or the idle wheel is increased, and as a result, the winding resistance is increased.

  The present invention has been devised in view of the above circumstances, and a main object thereof is to provide a rubber crawler in which the durability of a tensile body is improved while suppressing an increase in bending rigidity.

  The present invention is a rubber crawler, which is an endless belt-like crawler body made of rubber having a connecting portion in which ends in the circumferential direction of the crawler are vulcanized and connected to the crawler body in the circumferential direction of the crawler. A core material made of a material harder than the rubber, embedded in the crawler outer peripheral side of the crawler body, adjacent to the core material, and having a tensile strength to the crawler body A tensile body for applying, a reinforcing layer embedded adjacent to the tensile body and covering a substantially entire region of the tensile body in the crawler circumferential direction, and the connection portion of the crawler body The protective layer is embedded only in a part of the crawler circumferential direction and includes a protective layer for protecting the reinforcing layer.

  In the rubber crawler of the present invention, it is preferable that the reinforcing layer includes a cord layer in which a plurality of cords are arranged.

  In the rubber crawler of the present invention, the cord is preferably an organic fiber cord.

  In the rubber crawler according to the present invention, it is preferable that the cord is inclined at an angle of 35 to 55 ° with respect to the crawler circumferential direction.

  In the rubber crawler according to the present invention, it is desirable that the protective layer is disposed on the crawler outer peripheral side of the reinforcing layer.

  In the rubber crawler according to the present invention, the protective layer may be disposed on the inner peripheral side of the tensile body on the inner side of the crawler so as to surround the tensile body and the reinforcing layer, and on the outer side of the crawler of the reinforcing layer. It is desirable to include an arranged outer portion.

  In the rubber crawler of the present invention, it is preferable that the protective layer includes a protective cord layer in which organic fiber cords are arranged.

  In the rubber crawler of the present invention, it is preferable that the tensile body includes a metal cord layer in which a plurality of metal cords extending in the crawler circumferential direction are arranged in the crawler width direction.

  The rubber crawler according to the present invention preferably further includes a cover layer disposed so as to surround from the crawler inner peripheral side to the crawler outer peripheral side of the tensile body.

  In the rubber crawler according to the present invention, it is desirable that ends of the cover layer in the crawler width direction are abutted with each other.

  In the rubber crawler of the present invention, it is desirable that the ends of the cover layer in the crawler width direction are arranged with a gap therebetween.

  In the rubber crawler of the present invention, it is desirable that the reinforcing layer is disposed on the crawler outer peripheral side of the cover layer.

  The rubber crawler of the present invention is embedded in the crawler outer peripheral side adjacent to the core material with respect to the core material of the crawler body, and a tensile body for applying a tensile force to the crawler body, and the tensile body And a reinforcing layer for reinforcing a substantially entire region of the tensile body in the circumferential direction of the crawler. In such a rubber crawler, since the tensile body is protected by the reinforcing layer, even if the rubber of the crawler body is partially damaged, there is no possibility that the damage reaches the tensile body. For this reason, the tensile body can improve the durability.

  The rubber crawler of the present invention includes a protective layer that is embedded only in a part of the crawler circumferential direction including the connecting portion of the crawler body and protects the reinforcing layer. These rubber crawlers have a protective layer embedded in the connecting part of the crawler body, so there is no gap in the reinforcing layer due to the movement of the rubber in the connecting part during vulcanization, and the quality of the reinforcing layer is stabilized. Can be made. Further, since the reinforcing layer is embedded only in a part of the crawler circumferential direction, an increase in the bending rigidity of the rubber crawler can be suppressed. For this reason, the rubber crawler of this invention can improve the durability of a tensile body, suppressing the increase in the bending rigidity of a rubber crawler.

It is a perspective view which shows one Embodiment of the rubber crawler of this invention. It is sectional drawing of the AA line of the rubber crawler of FIG. It is sectional drawing of the BB line of the rubber crawler of FIG. It is sectional drawing of the rubber crawler of other embodiment. It is sectional drawing of the rubber crawler of other embodiment. It is sectional drawing of the rubber crawler of other embodiment.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing a rubber crawler 1 according to the present embodiment. As shown in FIG. 1, the rubber crawler 1 of this embodiment includes an endless belt-like crawler body 2 made of rubber, a core material 3 made of a material harder than rubber, and a crawler body 2 extending in the crawler circumferential direction. It is desirable to include a tensile body 4 for imparting a tensile strength F.

  In the present specification, the crawler circumferential direction is the rotational direction of the rubber crawler 1, and corresponds to the direction indicated by the symbol a in FIG. Further, the crawler width direction is an axial direction of drive wheels (not shown) when the rubber crawler 1 is mounted on the vehicle, and corresponds to a direction indicated by a symbol b in FIG. Furthermore, the crawler thickness direction is a direction orthogonal to the crawler circumferential direction a and the crawler width direction b, and corresponds to the direction indicated by reference sign c in FIG. In the crawler thickness direction c, the inner side of the endless belt-like rubber crawler 1 is a crawler inner peripheral side ci. The outer side of the endless belt-like rubber crawler 1 is a crawler outer peripheral side co.

  The crawler main body 2 of the present embodiment has a connection portion 2a in which ends in the crawler circumferential direction a are connected by vulcanization. The crawler body 2 has, for example, a substantially constant width in the crawler width direction b. Here, the crawler body 2 has an outer peripheral surface 2o on the crawler outer peripheral side co and an inner peripheral surface 2i on the crawler inner peripheral side ci. For example, a plurality of lugs 5 are formed on the outer peripheral surface 2 o of the crawler body 2.

  The core material 3 is preferably embedded in the crawler main body 2 with an interval in the crawler circumferential direction a. The core material 3 is made of a metal material such as steel or cast iron, for example. The core material 3 may be formed of a hard resin. Such a core material 3 can reinforce the crawler body 2 and maintain the shape of the crawler body 2.

  The tensile body 4 is preferably embedded in the crawler outer peripheral side co adjacent to the core material 3 rather than the core material 3 of the crawler body 2. The tensile body 4 includes, for example, a metal cord layer 6 extending in the crawler circumferential direction a. In the metal cord layer 6 of the present embodiment, a plurality of metal cords 6a extending in the crawler circumferential direction a are arranged in the crawler width direction b.

  The rubber crawler 1 of the present embodiment further includes a reinforcing layer 7 that is embedded adjacent to the tensile body 4 and covers the substantial entire region of the tensile body 4 in the crawler circumferential direction a. Here, the substantially whole area in the crawler circumferential direction a means 95% or more of the whole area in the crawler circumferential direction a.

  In such a rubber crawler 1, since the tensile body 4 is protected by the reinforcing layer 7, even if the rubber of the crawler body 2 is partially damaged, there is no possibility that the damage reaches the tensile body 4. . For this reason, the tensile body 4 can improve the durability.

  2 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line BB in FIG. As shown in FIGS. 2 and 3, the rubber crawler 1 is further embedded in only a part of the crawler circumferential direction a including the connecting portion 2 a of the crawler main body 2, and a protective layer for protecting the reinforcing layer 7. 8 is desirable. Here, a part in the crawler circumferential direction a means 10% or less of the entire area in the crawler circumferential direction a.

  In such a rubber crawler 1, since the protective layer 8 is embedded in the connecting portion 2a of the crawler body 2, there is no gap in the reinforcing layer 7 due to the movement of the rubber of the connecting portion 2a during vulcanization. The quality of the reinforcing layer 7 can be stabilized. Moreover, since the reinforcement layer 7 is embed | buried only in a part of crawler circumferential direction a, the increase in the bending rigidity of the rubber crawler 1 can be suppressed. For this reason, the rubber crawler 1 of this embodiment can improve the durability of the tensile body 4 while suppressing an increase in the bending rigidity of the rubber crawler 1.

  As a more preferable aspect, the rubber crawler 1 further includes a cover layer 9 in which the sheet-like cover 9a is disposed so as to surround from the crawler inner peripheral side ci to the crawler outer peripheral side co of the metal cord layer 6 of the tensile body 4. Yes. In such a rubber crawler 1, since the metal cord layer 6 is protected by the cover layer 9, even if the core material 3 and the tensile body 4 approach each other due to an excessive external force, the core material 3 and the metal cord layer 6. And the durability of the tensile body 4 can be further improved.

  As shown in FIG. 2, the cover layer 9 desirably has an end portion in the crawler width direction b. The end of the cover layer 9 of the present embodiment in the crawler width direction b is located on the crawler outer peripheral side co of the metal cord layer 6. Such a cover layer 9 covers between the core material 3 of the rubber crawler 1 and the metal cord layer 6 without a gap in the crawler width direction b, and the core material 3 and the metal cord layer 6 may be in direct contact with each other. Absent.

  The end portion of the cover layer 9 of the present embodiment in the crawler width direction b includes a first cover end 9b outside the crawler width direction b and a second cover end 9c inside the crawler width direction b. It is desirable that the end portions in the crawler width direction b of the cover layer 9 composed of the first cover end 9b and the second cover end 9c are arranged with a gap therebetween. Such a cover layer 9 does not cause an overlapping portion of the cover 9a in the crawler width direction b, and can improve the durability of the tensile body 4 while suppressing an increase in the bending rigidity of the rubber crawler 1. .

  As shown in FIG. 3, the cover layer 9 is preferably in the form of an end band having a third cover end 9d and a fourth cover end 9e in the crawler circumferential direction a. It is desirable that the third cover end 9d and the fourth cover end 9e are arranged with butting or a gap therebetween. Such a cover layer 9 does not cause an overlapping portion of the cover 9 a in the crawler circumferential direction a, and can improve the durability of the tensile body 4 while suppressing an increase in the bending rigidity of the rubber crawler 1.

  As shown in FIGS. 2 and 3, the metal cord layer 6 has, for example, an end portion in the crawler width direction b and has an endless belt shape in the crawler circumferential direction a. The metal cord 6a of the metal cord layer 6 is made of a metal such as steel, for example. The metal cord 6a of the present embodiment extends along the crawler circumferential direction a. Such a metal cord layer 6 can serve as a reference for the length when the rubber crawler 1 is wound around a drive wheel or idler wheel (not shown).

  The reinforcing layer 7 is preferably disposed on the crawler outer peripheral side co of the cover layer 9. The reinforcing layer 7 of the present embodiment includes at least one cord layer 10 in which a plurality of cords 10a are arranged in the crawler width direction b.

  The cord 10a of the cord layer 10 is, for example, an organic fiber cord that is harder than rubber. The cord 10a desirably extends in a direction inclined with respect to the crawler circumferential direction a. The cord 10a is preferably inclined at an angle of 35 to 55 ° with respect to the crawler circumferential direction a. Such a cord layer 10 has a small angle with respect to the crawler circumferential direction a of the cord 10a when the rubber crawler 1 is wound around a drive wheel or idler wheel (not shown). The increase can be suppressed.

  The cord layer 10 is preferably in the form of an end band having an end portion in the crawler width direction b and an end portion in the crawler circumferential direction a. The end of the cord layer 10 of the present embodiment in the crawler width direction b includes a first reinforcement end 10b outside the crawler width direction b and a second reinforcement end 10c inside the crawler width direction b.

  The first reinforcing end 10b and the second reinforcing end 10c are preferably located closer to the crawler inner peripheral side ci than the central portion of the cord layer 10 in the crawler width direction b. Since such a cord layer 10 can be disposed near the metal cord layer 6 while suppressing exposure from the crawler body 2, the tensile body 4 can be suppressed while suppressing an increase in bending rigidity of the rubber crawler 1. The durability of can be improved.

  The end of the cord layer 10 of the present embodiment in the crawler circumferential direction a includes a third reinforcing end 10d and a fourth reinforcing end 10e. It is desirable that the third reinforcing end 10d and the fourth reinforcing end 10e are arranged with butting or a gap therebetween. In such a cord layer 10, the overlapping portion of the cord layer 10 does not occur in the crawler circumferential direction a, and the durability of the tensile body 4 can be improved while suppressing an increase in the bending rigidity of the rubber crawler 1.

  The cord layer 10 of the present embodiment includes a first cord layer 10A adjacent to the tensile body 4 and a second cord layer 10B located on the crawler outer peripheral side co with respect to the first cord layer 10A. It is desirable that the cord 10a of the first cord layer 10A and the cord 10a of the second cord layer 10B are inclined in directions opposite to each other with respect to the crawler circumferential direction a. Such a cord layer 10 can efficiently protect the metal cord layer 6 and improve the durability of the tensile body 4.

  The third reinforcing end 10d of the first cord layer 10A and the third reinforcing end 10d of the second cord layer 10B are preferably arranged so as to be shifted in the crawler circumferential direction a. It is desirable that the fourth reinforcing end 10e of the first cord layer 10A and the fourth reinforcing end 10e of the second cord layer 10B be arranged so as to be shifted in the crawler circumferential direction a. Such a cord layer 10 is able to improve the durability of the tensile body 4 while the local change in rigidity is dispersed and the increase in the bending rigidity of the rubber crawler 1 is suppressed.

  In the present embodiment, the second code layer 10B is located closest to the crawler outer peripheral side co. The distance L1 from the center position of the metal cord layer 6 in the crawler thickness direction c to the second cord layer 10B is preferably the crawler thickness from the center position of the metal cord layer 6 to the outer peripheral surface 2o of the crawler body 2. It is 65% or less of the distance L2 in the direction c. If the distance L1 is larger than 65% of the distance L2, the stiffening reinforcing layer 7 is disposed on the crawler outer peripheral side co, so that the bending rigidity of the rubber crawler 1 may be increased.

  The protective layer 8 of this embodiment is disposed on the crawler outer peripheral side co of the reinforcing layer 7. The protective layer 8 includes, for example, a protective cord layer 11 in which organic fiber cords 11a are arranged. Such a protective layer 8 can reliably protect the reinforcing layer 7 from the movement of the rubber of the connecting portion 2a during vulcanization, so that no gap is generated in the reinforcing layer 7. For this reason, in the rubber crawler 1 of this embodiment, the reinforcing layer 7 can reliably protect the tensile body 4 and improve the durability of the tensile body 4.

  The protective cord layer 11 is preferably in the form of an end band having an end portion in the crawler width direction b and an end portion in the crawler circumferential direction a. The end of the protective cord layer 11 of the present embodiment in the crawler width direction b includes a first protective end 11b outside the crawler width direction b and a second protective end 11c inside the crawler width direction b. Further, the end portion of the protective cord layer 11 of the present embodiment in the crawler circumferential direction a includes a third protective end 11d and a fourth protective end 11e.

  The protective cord layer 11 is preferably substantially flat when the rubber crawler 1 is not wound around a drive wheel or idler wheel (not shown). In this case, the 1st protection end 11b, the 2nd protection end 11c, the 3rd protection end 11d, and the 4th protection end 11e are located on the same plane. Such a protective cord layer 11 can suppress the movement of the rubber of the connecting portion 2a during vulcanization, and can protect the reinforcing layer 7 more reliably.

  FIG. 4 is a cross-sectional view of a rubber crawler 21 according to another embodiment. The same reference numerals are given to the same elements as those in the above-described embodiment, and the description thereof is omitted. As shown in FIG. 4, the rubber crawler 21 of this embodiment includes a crawler body 2, a core material 3, a tensile body 4, a cover layer 9, and a reinforcing layer 7.

  The rubber crawler 21 of this embodiment is further embedded in only a part of the crawler circumferential direction a including the connecting portion 2a (shown in FIG. 1) of the crawler body 2, and a protective layer 22 for protecting the reinforcing layer 7. Is included.

  The protective layer 22 of this embodiment is disposed so as to surround the tensile body 4 and the reinforcing layer 7 from the crawler outer peripheral side co of the reinforcing layer 7 to the crawler inner peripheral side ci of the tensile body 4. The protective layer 22 includes, for example, a protective cord layer 23 in which organic fiber cords 23a are arranged. The protective cord layer 23 is preferably in the form of an end band having an end portion in the crawler width direction b and an end portion in the crawler circumferential direction a. The protective cord layer 23 of this embodiment includes an inner portion 23A disposed on the crawler inner peripheral side ci of the tensile body 4 and an outer portion 23B disposed on the crawler outer peripheral side co of the reinforcing layer 7.

  The end portion of the protective cord layer 23 of the present embodiment in the crawler width direction b includes a first protective end 23b outside the crawler width direction b and a second protective end 23c inside the crawler width direction b. The ends of the protective cord layer 23 formed of the first protective end 23b and the second protective end 23c in the crawler width direction b are preferably located on the inner side 23A and spaced apart from each other.

  Such a protective layer 22 can more reliably protect the reinforcing layer 7 from the movement of the rubber of the connecting portion 2a during vulcanization, so that no gap is generated in the reinforcing layer 7. For this reason, as for the rubber crawler 21 of this embodiment, the reinforcement layer 7 can protect the tension body 4 reliably, and can improve the durability of the tension body 4 more.

FIG. 5 is a cross-sectional view of a rubber crawler 31 according to still another embodiment. The same reference numerals are given to the same elements as those in the above-described embodiment, and the description thereof is omitted. As shown in FIG.
The rubber crawler 31 of this embodiment includes a crawler body 2, a core material 3, a tensile body 4, a reinforcing layer 7, and a protective layer 8.

  The rubber crawler 31 of this embodiment further includes a cover layer 32 in which a sheet-like cover 32 a is disposed so as to surround from the crawler inner peripheral side ci to the crawler outer peripheral side co of the metal cord layer 6 of the tensile body 4. .

  The cover layer 32 preferably has an end in the crawler width direction b. The end portion of the cover layer 32 of the present embodiment in the crawler width direction b includes a first cover end 32b outside the crawler width direction b and a second cover end 32c inside the crawler width direction b. The ends in the crawler width direction b of the cover layer 32 composed of the first cover end 32b and the second cover end 32c are preferably abutted with a slight gap therebetween.

  Such a cover layer 32 does not cause an overlapping portion of the cover 32a in the crawler width direction b, and can improve the durability of the tensile body 4 while suppressing an increase in the bending rigidity of the rubber crawler 31. . Moreover, since the cover layer 32 surrounds substantially the entire region of the crawler outer peripheral side co of the tensile body 4, the durability of the tensile body 4 is further improved in cooperation with the reinforcing layer 7.

  FIG. 6 is a cross-sectional view of a rubber crawler 41 of still another embodiment. The same reference numerals are given to the same elements as those in the above-described embodiment, and the description thereof is omitted. As shown in FIG. 6, the rubber crawler 41 of this embodiment includes a crawler body 2, a core material 3, a tensile body 4, a cover layer 32, and a reinforcing layer 7.

  The rubber crawler 41 of this embodiment is further embedded in only a part of the crawler circumferential direction a including the connecting portion 2a (shown in FIG. 1) of the crawler main body 2, and a protective layer 42 for protecting the reinforcing layer 7. Is included.

  The protective layer 42 of this embodiment is arranged so as to surround the tensile body 4 and the reinforcing layer 7 from the crawler outer peripheral side co of the reinforcing layer 7 to the crawler inner peripheral side ci of the tensile body 4. The protective layer 42 includes, for example, a first protective cord layer 43 in which organic fiber cords 43a are arranged outside the crawler width direction b, and a second protective cord layer 44 in which organic fiber cords 44a are arranged inside the crawler width direction b. Is included.

  The first protective cord layer 43 has, for example, an end-band shape having an end portion in the crawler width direction b and an end portion in the crawler circumferential direction a. The first protective cord layer 43 of this embodiment includes an inner portion 43A disposed on the crawler inner peripheral side ci of the tensile body 4 and an outer portion 43B disposed on the crawler outer peripheral side co of the reinforcing layer 7. Yes. The end portion of the first protective cord layer 43 in the crawler width direction b preferably includes a first inner protective end 43b located in the inner portion 43A and a first outer protective end 43c located in the outer portion 43B.

  The second protective cord layer 44 has, for example, an end band shape having an end portion in the crawler width direction b and an end portion in the crawler circumferential direction a. The second protective cord layer 44 of this embodiment includes an inner portion 44A disposed on the crawler inner peripheral side ci of the tensile body 4 and an outer portion 44B disposed on the crawler outer peripheral side co of the reinforcing layer 7. Yes. The end portion of the second protective cord layer 44 in the crawler width direction b preferably includes a second inner protective end 44b located in the inner portion 44A and a second outer protective end 44c located in the outer portion 44B.

  It is desirable that the first inner protective end 43b and the second inner protective end 44b are arranged with a gap on the crawler inner peripheral side ci of the tensile body 4. It is desirable that the first outer protective end 43c and the second outer protective end 44c are arranged with a gap on the crawler outer peripheral side co of the reinforcing layer 7.

  Such a protective layer 42 can suppress an increase in the bending rigidity of the rubber crawler 1 while reliably protecting the reinforcing layer 7 from the movement of the rubber of the connecting portion 2a during vulcanization. For this reason, the rubber crawler 41 of this embodiment can further improve the durability of the tensile body 4 while suppressing an increase in the bending rigidity of the rubber crawler 1.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to the above-mentioned embodiment, It can deform | transform and implement in a various aspect.

  A rubber crawler having the basic structure of FIG. 1 was prototyped based on the specifications in Table 1. These prototype rubber crawlers were mounted on a test vehicle and tested for durability and bending stiffness. The test method is as follows.

<Durability test>
A test vehicle mounted on the test crawler was run on a test course that reproduced a rough road including stones, and the time until the metal cord layer broke was measured. The breakage of the metal cord layer was confirmed by visual check every time the vehicle traveled a certain distance. A result is displayed by the index | exponent which sets the comparative example 1 to 100, and shows that it is excellent in durability, so that a numerical value is large.

<Bending stiffness test>
The bending rigidity when the test crawler was wrapped around the drive wheel of the test vehicle was evaluated by the sensuality of the operator as the ease of winding. The result indicates that there is no problem when the winding operation can be performed without any problem, and there is a problem when the winding operation is impossible or difficult.

  The test results are shown in Table 1.

  As a result of the test, it was confirmed that the rubber crawler of the example was superior in durability to the comparative example. Moreover, as for the rubber crawler of a comparative example and an Example, all could perform winding work without a problem, and it has confirmed that the increase in bending rigidity was suppressed also in the Example.

DESCRIPTION OF SYMBOLS 1 Rubber crawler 2 Crawler main body 2a Connection part 3 Core material 4 Tensile body 7 Reinforcement layer 8 Protective layer

Claims (12)

A rubber crawler,
An endless belt-like crawler body made of rubber having a connecting portion in which the ends in the crawler circumferential direction are vulcanized and connected,
A core material made of a material harder than the rubber embedded in the crawler body with a gap in the crawler circumferential direction, and
A tensile body embedded in the crawler outer peripheral side of the crawler main body, adjacent to the core material, and for applying a tensile force to the crawler main body;
A reinforcing layer embedded adjacent to the tensile body and covering substantially the entire region of the tensile body in the crawler circumferential direction;
Embedded in only a part of the crawler circumferential direction including the connection portion of the crawler body, and includes a protective layer for protecting the reinforcing layer.
Rubber crawler.   The rubber crawler according to claim 1, wherein the reinforcing layer includes a cord layer in which a plurality of cords are arranged.   The rubber crawler according to claim 2, wherein the cord is an organic fiber cord.   The rubber crawler according to claim 2 or 3, wherein the cord is inclined at an angle of 35 to 55 ° with respect to a crawler circumferential direction.   The rubber crawler according to any one of claims 1 to 4, wherein the protective layer is disposed on the crawler outer peripheral side of the reinforcing layer.   The protective layer includes an inner part disposed on the inner peripheral side of the crawler of the tensile body and an outer part disposed on the outer peripheral side of the crawler of the reinforcing layer so as to surround the tensile body and the reinforcing layer. The rubber crawler according to claim 1, comprising:   The rubber crawler according to any one of claims 1 to 6, wherein the protective layer includes a protective cord layer in which organic fiber cords are arranged.   The rubber crawler according to claim 1, wherein the tensile body includes a metal cord layer in which a plurality of metal cords extending in the crawler circumferential direction are arranged in the crawler width direction.   The rubber crawler according to any one of claims 1 to 8, further comprising a cover layer disposed so as to surround from the inner peripheral side of the tensile body to the outer peripheral side of the crawler.   The rubber crawler according to claim 9, wherein ends of the cover layer in the crawler width direction are abutted with each other.   The rubber crawler according to claim 9, wherein ends of the cover layer in the crawler width direction are arranged with a gap therebetween.   The rubber crawler according to claim 9, wherein the reinforcing layer is disposed on the crawler outer peripheral side of the cover layer.

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