JP5520576B2 - Rubber crawler - Google Patents

Description

  The present invention relates to a rubber crawler mounted on a construction machine such as a hydraulic excavator, an agricultural machine, or other crawler type vehicles.

Conventionally, as this type of rubber crawler, for example, as shown in Patent Document 1 below, an endless belt-like crawler body formed of a rubber material and wound between a driving wheel and a driven wheel, and the crawler There is known a configuration including a plurality of metal cores disposed on a main body at intervals in a crawler circumferential direction. In this rubber crawler, a pair of protrusions are disposed on the inner peripheral surface side of the crawler body with a gap in the crawler width direction, and a driving wheel and a driven wheel pass between them. The embedded wing portion and one protrusion portion of the pair of protrusion portions are integrally formed.
Since such a metal core has a complicated shape in which the wing part and the protrusion part are integrally formed, the metal core is highly accurate by forging which can reduce the weight while ensuring its strength. It is difficult to form integrally.
Therefore, in general, such a metal core is formed by casting which can easily form a complicated shape with high accuracy. However, in this case, in order to secure the strength of the cored bar, it is difficult to reduce the weight of the cored bar, and improvement is required in terms of weight reduction.

JP-A-5-683

  In recent years, it has been desired to reduce the weight of the rubber crawler by reducing the weight of the core while securing the strength of the core.

  This invention is made | formed in view of the situation mentioned above, The objective is to provide the rubber crawler which can achieve weight reduction.

In order to solve the above problems, the present invention proposes the following means.
A rubber crawler according to the present invention includes an endless belt-like crawler main body formed of a rubber material, and a plurality of core bars arranged at intervals in the crawler circumferential direction on the crawler main body. A rubber crawler comprising: a wing portion embedded in the crawler body; and a projection protruding from the wing portion toward the inner peripheral surface of the crawler body, wherein the wing portion and the projection portion The wing portion is formed by forging, and the projection is limited and formed by casting.

According to this invention, since the wing portion is formed by forging, it is possible to reduce the weight of the wing portion while ensuring the strength of the wing portion, for example, compared to the case where the entire core metal is formed by casting. Thus, the weight of the entire rubber crawler can be reduced.
In addition, since the wing portion can be reduced in weight as described above, the thickness of the wing portion can be reduced to increase the thickness of the crawler body, and the durability of the rubber crawler can be improved. it can.
In addition, since the protrusion is formed by casting, even if the protrusion has a complicated shape, it can be easily formed with high accuracy, and the degree of freedom in designing the protrusion can be ensured. be able to.
In addition, in this way, even if the protrusion has a complicated shape, it can be formed with high accuracy, and therefore, in the protrusion, a portion that is necessary for manufacturing is reduced when it is not necessary. As a result, the weight of the protrusion can be reduced.

  Also, either one of the wing portion and the projection portion protrudes toward the other and is inserted into an insertion hole formed in the other, and a bonding rubber disposed in the insertion hole An insertion protrusion that is joined to the inner peripheral surface of the insertion hole may be provided.

In this case, since the insertion protrusion is joined to the inner peripheral surface of the insertion hole via the joining rubber, the number of parts is larger than that in the case where the wing part and the projection part are connected using, for example, a knock pin or a fastening member. Can be suppressed.
In addition, since the insertion protrusion is bonded to the inner peripheral surface of the insertion hole via the bonding rubber in this way, the unvulcanized bonding rubber can be vulcanized with the insertion protrusion inserted into the insertion hole. Thus, it is possible to join the wing portion and the projecting portion. For example, as compared with a case where both are connected using a knock pin, a fastening member, or the like, the assembling work of the core bar can be simplified.
The joining rubber may be a part of the rubber material forming the crawler body, and the insertion protrusion may be joined to the inner peripheral surface of the insertion hole at the same time as the crawler body is vulcanized.

  Further, the insertion hole may be formed in the wing portion and penetrate the wing portion in the thickness direction of the crawler body.

  In this case, since the insertion hole is formed in the wing portion and penetrates the wing portion in the thickness direction, the insertion projection is inserted into the insertion hole, and the wing portion and the projection portion are combined and inserted. This unvulcanized joint is obtained by pressing the unvulcanized joint rubber against the wing part side and vulcanizing it with the unvulcanized joint rubber disposed on the opening on the outer peripheral surface side of the crawler body in the hole. It is possible to vulcanize the rubber while entering the insertion hole to join the insertion protrusion to the inner peripheral surface of the insertion hole, and to further simplify the assembling work of the cored bar.

  In addition, a gap between the outer peripheral surface of the insertion protrusion and the inner peripheral surface of the insertion hole may gradually increase from the inner peripheral surface side to the outer peripheral surface side of the crawler body.

In this case, since the gap between the outer peripheral surface of the insertion protrusion and the inner peripheral surface of the insertion hole increases from the inner peripheral surface side of the crawler main body toward the outer peripheral surface side, the outer peripheral surface of the crawler main body in the insertion hole The insertion protrusion is made easy by allowing unvulcanized bonding rubber to enter the insertion hole from the opening on the side, and supporting the end portion of the insertion protrusion on the inner peripheral surface side of the crawler body on the inner peripheral surface of the insertion hole. Can be controlled in the insertion hole. Therefore, the unvulcanized bonding rubber can surely enter the insertion hole, and the relative movement of the wing portion and the projection portion in the crawler circumferential direction and the crawler width direction can be restricted. The protrusion can be firmly bonded.
If the maximum width of the cross-section of the insertion protrusion gradually decreases from the inner peripheral surface side to the outer peripheral surface side of the crawler body, the insertion protrusion can be easily inserted into the insertion hole. It is possible to further simplify the assembling work of the cored bar. Here, the maximum cross-sectional width of the insertion protrusion refers to the largest of the sizes in the direction orthogonal to the axis of the insertion protrusion.

  Further, the insertion hole has a rectangular shape in a plan view as viewed from the outer peripheral surface side of the crawler body, and the insertion protrusion is formed in a quadrangular prism shape, and the crawler is formed in at least one of the corners. A notch that opens toward the outer peripheral surface of the main body may be formed.

In this case, since at least one of the corners of the insertion protrusion is formed with a notch that opens toward the outer peripheral surface of the crawler body, the insertion hole has an opening on the outer peripheral surface side of the crawler main body. The unvulcanized bonding rubber can be easily made to enter the insertion hole. On the other hand, the portion where the notch is not formed in the insertion protrusion is supported by the inner peripheral surface of the insertion hole, whereby the insertion protrusion can be reliably prevented from rattling in the insertion hole.
Therefore, the unvulcanized bonding rubber can surely enter the insertion hole, and the relative movement of the wing portion and the projection portion in the crawler circumferential direction and the crawler width direction can be restricted. The protrusion can be firmly bonded.
The notch is formed in at least one of the two corners located on the insertion protrusion in the insertion protrusion, and is formed in the other two corners different from these two corners. If not, the other two corners are supported on the inner peripheral surface of the insertion hole, so that the insertion protrusion can be reliably restricted from rotating around the axis and rattling in the insertion hole. .

  In addition, a pair of the protrusions are disposed on the wing part at intervals in the crawler width direction, and each of the pair of protrusions protrudes toward one side in the crawler circumferential direction and extends along the crawler width direction. A first derailment prevention mechanism located on the inner side of the crawler body, and a second derailment prevention mechanism located on the outer side of the crawler body along the crawler width direction while projecting toward the other side in the crawler circumferential direction. The first wheel removal preventing mechanism and the second wheel removal preventing mechanism that are formed and adjacent to each other in the crawler circumferential direction may face each other in the crawler width direction.

In this case, since the first wheel removal preventing mechanism and the second wheel removing preventing mechanism of the protrusions adjacent in the crawler circumferential direction are opposed in the crawler width direction, the core bars adjacent in the crawler circumferential direction are When a position is relatively displaced in the crawler width direction, the first wheel-release preventing mechanism and the second one of the two protrusions adjacent to each other in the crawler circumferential direction among the pair of protrusions included in the cored bar. Since the portions facing each other in the derailment prevention mechanism come into contact with each other, the relative positional deviation between the core bars can be regulated.
In addition, since the first wheel removal prevention mechanism and the second wheel removal prevention mechanism are formed on the protrusion formed by casting, these wheel removal prevention mechanisms can be formed easily and with high accuracy.
Further, as described above, since the first and second anti-developing mechanisms are formed on the protrusions, when these anti-derailing mechanisms are formed on the wings and embedded in the crawler body. In comparison, it is possible to suppress the distortion that occurs on the outer peripheral surface side of the crawler body that is bent on the driving wheel or the driven wheel, and the durability of the rubber crawler can be further improved. it can.

  The rubber crawler according to the present invention can reduce the weight.

It is a perspective view containing the partial cross section of the rubber crawler which concerns on one Embodiment of this invention. It is a perspective view of the metal core with which the rubber crawler shown in FIG. 1 is provided. It is sectional drawing along the crawler width direction of the rubber crawler shown in FIG. It is a bottom view of the metal core with which the rubber crawler shown in FIG. 1 is provided. It is the schematic for demonstrating the manufacturing method of the rubber crawler shown in FIG.

Hereinafter, a rubber crawler according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, for example, a pair of left and right crawler type traveling bodies 10 disposed under a construction machine such as a hydraulic excavator, an agricultural machine, and other crawler type vehicles have a driving wheel 11 and a driven wheel (not shown). A rubber crawler 20 wound in an endless belt shape is provided.

The drive wheel 11 is a sprocket and is rotatably supported by drive means such as a hydraulic motor provided on a vehicle frame (not shown).
The driven wheel is rotatably supported by the vehicle frame.
In addition, a plurality of roller wheels 12 rotatably supported by the vehicle frame are disposed in a portion located between the driving wheel 11 and the driven wheel on the inner peripheral surface 21a side of the crawler body 21 described later. Yes. In the illustrated example, the wheel 12 is supported so as to be rotatable about a rotation axis extending in the crawler width direction H, and the outer peripheral surface of the center of the wheel 12 in the crawler width direction H has an annular inner side extending over the entire circumference. The guide convex part 12a is protrudingly provided.

The rubber crawler 20 is made of a rubber material, and is provided with an endless belt-like crawler body 21 that is wound between the driving wheel 11 and the driven wheel, and is disposed on the crawler body 21 with an interval in the crawler circumferential direction. A plurality of cored bars 22.
A plurality of lugs 23 project from the outer peripheral surface 21 b of the crawler body 21, and meshing holes 24 for the drive wheels 11 are opened between the core bars 22 adjacent to each other in the crawler circumferential direction in the crawler body 21. ing.

  The cored bar 22 is disposed in the crawler width direction H with a wing portion 25 embedded in the crawler body 21, projecting from the wing portion 25 toward the inner peripheral surface 21 a side of the crawler body 21, and And a pair of protrusions 26 through which the driving wheel 11 and the driven wheel pass.

  The wing portion 25 extends along the crawler width direction H, and the pair of protrusions 26 are disposed at the center of the wing portion 25 in the crawler width direction H. In the crawler main body 21, the crawler peripheral portion 21 b is closer to the outer peripheral surface 21 b of the crawler main body 21 than the wing portion 25, and is located on the outer side of the crawler main body 21 along the crawler width direction H from the protrusion 26. A pair of steel cord layers 27 extending in the direction are embedded.

  As shown in FIG. 2, each of the pair of protrusions 26 protrudes toward one side in the crawler circumferential direction and is located on the inner side of the crawler main body 21 along the crawler width direction H. And a second derailment prevention mechanism 29 that protrudes toward the other side in the crawler circumferential direction and is located outside the crawler main body 21 along the crawler width direction H. In the present embodiment, the protruding amounts of the first and second anti-rolling mechanisms 28 and 29 are equal to each other.

  In the example shown in the drawing, the protrusion 26, the first wheel removal preventing mechanism 28, and the second wheel removing preventing mechanism 29 are formed with a lightening portion 31. The lightening portions 31 are crawlers along the crawler width direction H at both side surfaces facing the crawler width direction H at the central portion in the crawler circumferential direction of the protrusion portion 26 and at the central portion in the crawler circumferential direction of the first derailment prevention mechanism 28. A side surface facing the inner side of the main body 21 and a side surface facing the outer side of the crawler main body 21 along the crawler width direction H at the central portion in the crawler circumferential direction of the second derailment prevention mechanism 29 are formed.

  As shown in FIG. 1, the first wheel removal preventing mechanism 28 and the second wheel removal preventing mechanism 29 between the protrusions 26 adjacent in the crawler circumferential direction face each other in the crawler width direction H. In the example shown in the drawing, the tip portion of the first anti-roll-off mechanism 28 of the projection 26 located on the other side in the crawler circumferential direction is located on one side in the crawler circumferential direction between the projections 26 adjacent in the crawler circumferential direction. The protruding portion 26 is close to the tip end portion of the second derailment prevention mechanism 29 from the inside of the crawler main body 21 along the crawler width direction H.

  As shown in FIG. 2, the top surfaces 26a of the protrusions 26 are smoothly connected to the top surfaces 28a and 29a of the first and second anti-rolling mechanisms 28 and 29 without any step. . As shown in FIG. 1, the crawler circumferential direction is formed by the top surfaces 26 a of the projections 26 adjacent to each other in the crawler circumferential direction and the top surfaces 28 a and 29 a of the anti-derailing mechanisms 28 and 29 connected to the projections 26. A pair of left and right wheel passing surfaces S extending continuously over the entire circumference is formed.

  On these wheel passing surfaces S, the wheel 12 is rolled along with the feed movement of the rubber crawler 20 along the crawler circumferential direction. In the present embodiment, the inner guide protrusion 12 a is disposed between the pair of protrusions 26, faces both protrusions 26 from the inside of the crawler main body 21 along the crawler width direction H, and the inside of the crawler main body 21. The wheel 12 rolls on the pair of wheel passing surfaces S while being separated from the peripheral surface 21a.

  Of the plurality of rollers 12, a part of the inner peripheral surface 21a of the crawler main body 21 is disposed so as to support the lower part of the crawler main body 21 from the upper side, and the rest of the rollers 12 are provided inside the crawler main body 21. It arrange | positions so that the part located in the upper side in the surrounding surface 21a may be supported from the lower side. The former roller 12 allows the lower part of the outer peripheral surface 21b of the crawler body 21 to be pressed against the ground, and the latter roller 12 supports the upper part of the crawler body 21 so as not to loosen. It is supposed to let you.

Here, in the present embodiment, the surface formed by connecting the top surfaces 26a, 28a, 29a of the protrusion 26, the first wheel removal preventing mechanism 28 and the second wheel removing preventing mechanism 29 extends along the crawler circumferential direction. A concave curved surface that gradually extends toward the outer peripheral surface 21b of the crawler body 21 as it goes from the outside of the protrusion 26 toward the center. The radius of curvature of the concave curved surface is greater than or equal to the outer diameter of the wheel 12.
Further, in the illustrated example, the protrusion 26 is covered with a rubber film 32 formed integrally with the crawler main body 21.

  As shown in FIG. 3, the wing portion 25 and the projection portion 26 are formed of different members, and the projection portion 26 protrudes toward the wing portion 25 and is formed in the wing portion 25. An insertion projection 35 is provided which is inserted into the insertion hole 33 and bonded to the inner peripheral surface 33 a of the insertion hole 33 via a bonding rubber 34 provided in the insertion hole 33. Further, the gap between the outer peripheral surface 35a of the insertion protrusion 35 and the inner peripheral surface 33a of the insertion hole 33 is gradually increased from the inner peripheral surface 21a side of the crawler body 21 toward the outer peripheral surface 21b side.

A pair of insertion holes 33 are formed at the center in the crawler width direction H of the wing portion 25 at intervals in the crawler width direction H, and penetrate the wing portion 25 in the thickness direction T of the crawler body 21. The width is the same over the entire length in the thickness direction T. Further, the bottom surface 26b of the protrusion 26 is in contact with the opening peripheral edge of the insertion hole 33 in the portion of the wing 25 that faces the inner peripheral surface 21a of the crawler body 21. In addition, it is preferable that the insertion hole 33 is closed from the inner peripheral surface 21 a side by the protrusion 26 by the bottom surface 26 b of the protrusion 26 abutting the entire periphery of the opening peripheral edge of the insertion hole 33.
As shown in FIG. 4, the insertion hole 33 has a rectangular shape (rectangular shape) that is long in the circumferential direction of the crawler when viewed from the outer peripheral surface 21 b side of the crawler body 21.

As shown in FIG. 3, the insertion protrusion 35 protrudes coaxially with the insertion hole 33 toward the outer peripheral surface 21 b side of the crawler body 21 on the bottom surface 26 b of the protrusion portion 26, and the maximum cross-sectional width of the insertion protrusion 35 is The crawler body 21 gradually becomes smaller from the inner peripheral surface 21a side toward the outer peripheral surface 21b side. Note that the maximum cross-sectional width of the insertion protrusion 35 is the largest of the sizes of the insertion protrusion 35 in the direction perpendicular to the axis.
Further, the protruding amount of the insertion protrusion 35 is equal to or less than the size of the insertion hole 33 along the thickness direction T. In the illustrated example, the end surface of the insertion protrusion 35 on the outer peripheral surface 21b side of the crawler body 21 is The insertion hole 33 is located on the opening surface on the outer peripheral surface 21 b side of the crawler body 21.

  As shown in FIG. 4, the insertion protrusion 35 is formed in a quadrangular prism shape, and a notch that opens toward the outer peripheral surface 21 b of the crawler main body 21 at two corners 35 b that are located across the axis. 36 is formed. In the illustrated example, the cutout portion 36 is formed by cutting out the entire corner portion 35 b and is formed over the entire length of the insertion protrusion 35 along the thickness direction T. Further, the other two corner portions 35c different from these two corner portions 35b are not formed with the notches 36.

  And in this embodiment, while the wing | blade part 25 is formed by forge, the projection part 26 is formed by casting. The wing part 25 is formed by die forging of, for example, mild steel, hard steel, alloy steel, and the hardness thereof is, for example, Rockwell hardness of HRC 25-50. Moreover, the protrusion part 26 is formed, for example with cast iron, cast steel, a copper alloy, an aluminum alloy, etc., and the hardness is HB300-500 by Brinell hardness, for example.

  As shown in FIG. 3, the bonding rubber 34 is filled without a gap between the outer peripheral surface 35 a of the insertion protrusion 35 and the inner peripheral surface 33 a of the insertion hole 33, and a part of the rubber material that forms the crawler body 21. It is said that. Of the gap between the outer peripheral surface 35a of the insertion protrusion 35 and the inner peripheral surface 33a of the insertion hole 33, the size at the end on the outer peripheral surface 21b side of the crawler body 21 is, for example, 0.5 mm or more, preferably It is 1.0 mm or more and less than ½ of the maximum width of the insertion hole 33.

Next, an example of a method for manufacturing the rubber crawler 20 configured as described above will be described with reference to FIG.
First, a cap rubber 41 that forms the outer peripheral surface 21 b side of the crawler body 21, an inner rubber 42 that forms the inner peripheral surface 21 a side of the crawler main body 21, and between the steel cord layer 27 and the cored bar 22 in the crawler main body 21. Are formed by a scouring step and a rolling step, respectively, and a steel cord 27a constituting the steel cord layer 27, a wing portion 25 of the cored bar 22, and a protruding portion 26 are formed respectively. The cap rubber 41, the inner rubber 42, and the rubber sheet 43 are all in an unvulcanized state.

  Next, the insertion protrusion 35 is inserted into the insertion hole 33 and the wing part 25 and the protrusion part 26 are combined to form the cored bar 22, and the outer surface of the cored bar 22 is subjected to a ground treatment. Thereafter, the inner rubber 42, the core metal 22, the rubber sheet 43, the steel cord layer 27, and the cap rubber 41 are laminated in this order to form a molded body of the rubber crawler 20, and in a mold (not shown). The molded body is placed and heated under pressure in the direction of lamination, and vulcanized.

Here, in this embodiment, since the insertion hole 33 penetrates the wing portion 25 in the thickness direction T, the crawler body 21 in the insertion hole 33 in at least the rubber sheet 43 of the rubber sheet 43 and the cap rubber 41. The portion located on the opening on the outer peripheral surface 21 b side of the pierced article enters the insertion hole 33 and is vulcanized in a state where it is filled between the outer peripheral surface 35 a of the insertion protrusion 35 and the inner peripheral surface 33 a of the insertion hole 33. As a result, a bonding rubber 34 is formed, and the insertion protrusion 35 and the inner peripheral surface 33 a of the insertion hole 33 are bonded.
By the above, each member which comprises the molded object of the rubber crawler 20 is united, and the rubber crawler 20 is formed.

As described above, according to the rubber crawler 20 according to the present embodiment, since the wing portion 25 is formed by forging, for example, compared to a case where the entire core metal 22 is formed by casting, the wing portion 25. It is possible to reduce the weight of the wing portion 25 while ensuring the strength of the rubber crawler 20 and to reduce the weight of the entire rubber crawler 20.
In addition, since the wing portion 25 can be reduced in weight as described above, it is possible to reduce the thickness of the wing portion 25 and increase the thickness of the crawler body 21, and to improve the durability of the rubber crawler 20. Can be improved. For example, by increasing the thickness of the portion of the crawler main body 21 located on the inner peripheral surface 21a side, the durability of this portion can be improved.

In addition, since the protruding portion 26 is formed by casting, it can be easily formed with high accuracy even when the protruding portion 26 has a complicated shape, and the degree of freedom in designing the protruding portion 26. Can be secured. For example, even in the case where the first wheel removal preventing mechanism 28 and the second wheel removal preventing mechanism 29 are formed on the protrusion 26 as in the present embodiment, these wheel removal preventing mechanisms 28, 29 can be easily and It can be formed with high accuracy.
In addition, as described above, even when the protrusion 26 has a complicated shape, it can be formed with high accuracy, and therefore, the protrusion 26 is reduced in unnecessary parts when it is necessary for manufacturing. As a result, the weight of the protrusion 26 can be reduced.

Moreover, since the insertion protrusion 35 is joined to the inner peripheral surface 33a of the insertion hole 33 via the joining rubber 34, the wing part 25 and the projection part 26 are connected using, for example, a knock pin, a fastening member, or the like. In comparison, the increase in the number of parts can be suppressed.
Since the insertion protrusion 35 is joined to the inner peripheral surface 33a of the insertion hole 33 via the joining rubber 34 in this way, the rubber sheet 43 (unadded) is inserted in the insertion hole 33. By vulcanizing the vulcanized bonding rubber), the wing portion 25 and the projection portion 26 can be bonded. For example, compared to a case where both are connected using a knock pin, a fastening member, or the like, the core metal 22 Assembling work can be simplified.
The joining rubber 34 is a part of the rubber material forming the crawler body 21, and the insertion protrusion 35 is joined to the inner peripheral surface 33 a of the insertion hole 33 at the same time as the crawler body 21 is vulcanized. Therefore, there is no need to newly provide another member for forming the bonding rubber 34, and further increase in the number of components and further simplification of the assembly work can be achieved.

  In addition, since the insertion hole 33 is formed in the wing portion 25 and penetrates the wing portion 25 in the thickness direction T, the insertion protrusion 35 is inserted into the insertion hole 33 and the wing portion 25 and the protrusion portion are inserted. 26, and in a state where the rubber sheet 43 is disposed on the opening on the outer peripheral surface 21b side of the crawler main body 21 in the insertion hole 33, the rubber sheet 43 is pressed against the wing portion 25 side and vulcanized. A part of the rubber sheet 43 is vulcanized while entering the insertion hole 33, and the insertion protrusion 35 can be joined to the inner peripheral surface 33a of the insertion hole 33. This further simplifies the assembly work of the cored bar 22. Can be achieved.

Moreover, since the clearance gap between the outer peripheral surface 35a of the insertion protrusion 35 and the inner peripheral surface 33a of the insertion hole 33 becomes large as it goes to the outer peripheral surface 21b side from the inner peripheral surface 21a side of the crawler main body 21, the insertion hole 33, it is easy to allow a part of the rubber sheet 43 to enter the insertion hole 33 from the opening on the outer peripheral surface 21b side of the crawler main body 21 and insert the end portion on the inner peripheral surface 21a side of the crawler main body 21 in the insertion protrusion 35. Supporting the inner circumferential surface 33 a of the hole 33 can restrict the insertion protrusion 35 from rattling in the insertion hole 33.
Therefore, a part of the rubber sheet 43 can surely enter the insertion hole 33 and the relative movement of the wing portion 25 and the projection portion 26 in the crawler circumferential direction and the crawler width direction H can be restricted. The wing part 25 and the protrusion part 26 can be firmly joined.

Furthermore, since a notch 36 is formed at the corner 35b of the insertion protrusion 35 so as to open toward the outer peripheral surface 21b of the crawler main body 21, the opening on the outer peripheral surface 21b side of the crawler main body 21 in the insertion hole 33 is formed. Therefore, a part of the rubber sheet 43 can be made to enter the insertion hole 33 more easily. On the other hand, the portion of the insertion protrusion 35 where the notch 36 is not formed is supported by the inner peripheral surface 33 a of the insertion hole 33, thereby reliably restricting the insertion protrusion 35 from rattling in the insertion hole 33. Can do.
Therefore, a part of the rubber sheet 43 can be more reliably entered into the insertion hole 33 and the relative movement of the wing portion 25 and the projection portion 26 in the crawler circumferential direction and the crawler width direction H can be reliably regulated. It becomes possible, and the wing | blade part 25 and the projection part 26 can be joined still more firmly.

  Further, as in the present embodiment, the notch portion 36 is formed in the insertion protrusion 35 at two corner portions 35b that are located across the axis thereof, and the other two corners different from these two corner portions 35b. If not formed in the portion 35c, the other two corner portions 35c are supported by the inner peripheral surface 33a of the insertion hole 33, so that the insertion protrusion 35 rotates around the axis and moves into the insertion hole 33. It is possible to reliably regulate the shakiness.

  Further, since the maximum cross-sectional width of the insertion protrusion 35 gradually decreases from the inner peripheral surface 21 a side to the outer peripheral surface 21 b side of the crawler body 21, the insertion protrusion 35 can be easily inserted into the insertion hole 33. As a result, the assembly work of the cored bar 22 can be further simplified.

In the present embodiment, the size of the end portion on the outer peripheral surface 21b side of the crawler main body 21 in the gap between the outer peripheral surface 35a of the insertion protrusion 35 and the inner peripheral surface 33a of the insertion hole 33 is 0.5 mm or more. Therefore, the insertion protrusion 35 can be surely and easily inserted. That is, when the size is smaller than 0.5 mm, the insertion protrusion 35 may not be easily inserted.
Furthermore, in the present embodiment, since the size is 1.0 mm or more and less than ½ of the maximum width of the insertion hole 33, the insertion protrusion 35 and the insertion hole 33 by the bonding rubber 34 are further separated. It is possible to join firmly and securely. That is, when the size is smaller than 1.0 mm, it may be difficult to allow a part of the rubber sheet 43 to enter the gap. On the other hand, when the size is ½ or more of the maximum width of the insertion hole 33, a large amount of bonding rubber 34 is disposed in the insertion hole 33, and the insertion protrusion 35 is inserted into the insertion hole 33. There is a risk that rattling is likely to occur within 33.

  In addition, since the first wheel removal preventing mechanism 28 and the second wheel removal preventing mechanism 29 between the protrusions 26 adjacent in the crawler circumferential direction face each other in the crawler width direction H, the core bars adjacent in the crawler circumferential direction are adjacent to each other. Among the pair of protrusions 26 provided in the core metal 22 when the 22s are about to be displaced relative to each other in the crawler width direction H, the first of the protrusions 26 adjacent to each other in the crawler circumferential direction. The portions of the first wheel removal preventing mechanism 28 and the second wheel removing preventing mechanism 29 that are opposed to each other come into contact with each other, so that the relative displacement between the core bars 22 can be regulated.

  In addition, since the first derailment prevention mechanism 28 and the second derailment prevention mechanism 29 are formed on the protrusion 26, these derailment prevention mechanisms 28 and 29 are formed on the wing portion 25 and embedded in the crawler body 21. Compared with the case where the crawler body 21 is made, it is possible to suppress distortion generated on the outer peripheral surface 21b side of the crawler body 21 on the driving wheel 11 or the driven wheel and bent on the driven wheel 11, and this rubber crawler. The durability of 20 can be further improved.

  In this embodiment, the radius of curvature of the concave curved surface formed by connecting the top surfaces 26a, 28a, 29a of the protrusion 26, the first wheel removal preventing mechanism 28, and the second wheel removing preventing mechanism 29 is the rolling wheel 12. Therefore, when the roller 12 is rolled on the roller passing surface S as the rubber crawler 20 moves along the circumferential direction of the crawler, the roller crawler 20 protrudes from the protrusion 26 of the roller 12. The amount of sagging can be reduced, and the ride comfort can be improved by suppressing the occurrence of vibration.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the wheel passing surface S is continuously extended over the entire circumference in the crawler circumferential direction, but is not limited thereto, and may not extend continuously. In addition, although the first and second anti-rolling mechanisms 28 and 29 are formed on the pair of protrusions 26, they may be omitted. Furthermore, although the protrusion 26, the first wheel removal prevention mechanism 28, and the second wheel removal prevention mechanism 29 are formed with the lightening portion 31, the lightening portion 31 may not be provided.
Further, the steel cord layer 27 may not be provided.

  Moreover, in the said embodiment, the surface comprised by each top surface 26a, 28a, 29a of the projection part 26, the 1st wheel removal prevention mechanism 28, and the 2nd wheel removal prevention mechanism 29 becomes a concave curved surface. However, the present invention is not limited to this. For example, it may be a flat surface. Further, when the protrusion 26 is not formed with the anti-derailing mechanism 28, 29, the top surface 26a of the protrusion 26 is independent, and gradually crawlers from the outer side of the protrusion 26 along the crawler circumferential direction toward the center portion. It may be a concave curved surface extending toward the outer peripheral surface 21 b side of the main body 21.

  In the above-described embodiment, the insertion protrusion 35 has the notch 36 formed in the two corners 35b positioned with the axis therebetween, but at least one of the corners 35b and 35c. It suffices if it is formed. For example, the notch 36 may be formed in at least one of the two corners 35b, or may be formed in three or more corners 35b and 35c. Further, the cutout portion 36 is formed by cutting out the entire corner portion 35b. However, the cutout portion 36 is not limited to this, and is formed by cutting out a part of the corner portion 35b. Also good. Furthermore, the notch 36 may not be provided.

Moreover, in the said embodiment, although the insertion protrusion 35 shall be formed in square pillar shape, it is not restricted to this.
Furthermore, in the said embodiment, although the cross-sectional maximum width of the insertion protrusion 35 was gradually reduced as it went to the outer peripheral surface 21b side from the inner peripheral surface 21a side of the crawler main body 21, it is not restricted to this. Absent.

Moreover, in the said embodiment, although the width | variety of the insertion hole 33 shall be equal over the full length of the said thickness direction T, it is not restricted to this. For example, the maximum width of the insertion hole 33 may gradually increase from the inner peripheral surface 21a side of the crawler body 21 toward the outer peripheral surface 21b side.
Furthermore, in the above-described embodiment, the insertion hole 33 has a rectangular shape that is long in the crawler circumferential direction when viewed from the outer peripheral surface 21b side of the crawler body 21. It may also be other shapes different from the rectangular shape.

Moreover, in the said embodiment, the magnitude | size in the edge part by the side of the outer peripheral surface 21b of the crawler main body 21 among the clearance gaps between the outer peripheral surface 35a of the insertion protrusion 35 and the inner peripheral surface 33a of the insertion hole 33 is 0. Although it is 5 mm or more, preferably 1.0 mm or more and less than ½ of the maximum width of the insertion hole 33, it is not limited to this.
Furthermore, in the above-described embodiment, the gap between the outer peripheral surface 35a of the insertion protrusion 35 and the inner peripheral surface 33a of the insertion hole 33 is gradually increased from the inner peripheral surface 21a side of the crawler body 21 toward the outer peripheral surface 21b side. However, the present invention is not limited to this. For example, the gap may be the same regardless of the position in the thickness direction T.
Furthermore, in the said embodiment, although the insertion hole 33 penetrated the wing | blade part 25 in the said thickness direction T, it is not restricted to this, It does not need to penetrate.

  In the embodiment, the insertion hole 33 is formed in the wing portion 25 and the insertion projection 35 is formed in the projection portion 26. However, the present invention is not limited to this, and the insertion projection is formed in the wing portion 25. The insertion hole may be formed in the protrusion 26. That is, it is only necessary that either one of the wing portion 25 and the projection portion 26 be provided with an insertion projection that protrudes toward the other and is inserted into an insertion hole formed in the other.

In the above embodiment, the bonding rubber 34 is filled without a gap between the outer peripheral surface 35a of the insertion protrusion 35 and the inner peripheral surface 33a of the insertion hole 33. However, the present invention is not limited to this. Alternatively, it may be disposed in a part of the insertion hole 33.
Furthermore, the manufacturing method of the rubber crawler 20 is not limited to the one shown in the embodiment. For example, the molded body of the rubber crawler 20 may be formed after adopting a configuration in which the steel cord layer 27 is embedded in the rubber sheet 43, the cap rubber 41, another rubber member, or the like. Further, the rubber sheet 43 may not be provided. In this case, for example, the bonding rubber 34 may be formed by allowing the cap rubber 41 to enter the insertion hole 33 and vulcanize.
Furthermore, the bonding rubber 34 is a part of the rubber material that forms the crawler body 21, but is not limited thereto, and is formed by a member different from the crawler body 21, for example. Also good.

  Further, instead of the insertion hole 33 and the insertion protrusion 35, the wing part 25 and the protrusion part 26 may be coupled using a fastening member or the like.

In the embodiment, the inner guide protrusion 12 a is disposed between the pair of protrusions 26, faces both protrusions 26 from the inside of the crawler main body 21 along the crawler width direction H, and the crawler main body 21. Although the wheel 12 rolls on the pair of wheel passing surfaces S in a state of being separated from the inner peripheral surface 21a, the present invention is not limited to this.
For example, both end portions of the roller wheel 12 in the crawler width direction H are positioned outside the crawler main body 21 along the crawler width direction H rather than each of the pair of protrusions 26, and are respectively formed on the outer peripheral surfaces at these both end portions. Alternatively, a configuration may be adopted in which an annular outer guide convex portion that extends over the entire circumference and faces the outside of the crawler main body 21 along the crawler width direction H is provided to protrude from each projection portion 26. In this case, the roller guide 12 does not need to be provided with the inner guide protrusion 12a.

In the above embodiment, the cored bar 22 includes the pair of protrusions 26. However, the present invention is not limited to this. For example, one protrusion 26 is connected to the wing portion 25 in the crawler width direction H. The structure provided in the center part of the may be sufficient. In this case, for example, instead of the meshing hole 24, a meshing recess for the drive wheel 11 may be formed between the protrusions 26 adjacent in the crawler circumferential direction. In this case, the inner guide convex portion 12a is not projected on the outer peripheral surface of the center portion of the roller wheel 12 in the crawler width direction H, but the center portion of the roller wheel 12 in the crawler width direction H is disposed on the protrusion portion 26. Then, a pair of annular outer guide protrusions that sandwich the protrusions 26 may be provided on the outer peripheral surfaces of both end portions in the crawler width direction H of the roller 12.

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

Next, a verification test was conducted on the above-described effects in the case where the wing portion was formed by forging and the projection portion was formed by casting.
As a conventional example, a cored bar in which a wing part and a pair of protrusions are integrally formed by casting is adopted, and as a practical example, a cored bar included in the rubber crawler shown in FIG. 1 is adopted. Both cores are formed so that the strength of the wings of the cores of each of the conventional examples and the examples is equal, and the weight of each cored bar is positioned in the vicinity of the protrusions in the wings of each cored bar. The thickness of the root portion was measured. The root portion is a portion where the largest distortion occurs when a force is applied from the inner peripheral surface side of the crawler body to a portion located between the pair of protrusions in the wing portion.
Then, using the conventional example as the evaluation standard (100), the weight and the wall thickness of the cored bar of the example were evaluated by an index. The weight and the thickness index indicate that the smaller the numerical value, the better.
As a result, in the example, the weight was 86 and the wall thickness was 67. Thereby, in the core metal of the Example, it was confirmed that the core metal can be reduced in weight while ensuring the strength of the wing section and the thickness of the wing section can be reduced.

H Crawler width direction T Thickness direction 11 Driving wheel 12 Rolling wheel 20 Rubber crawler 21 Crawler main body 21a Crawler main body inner peripheral surface 21b Crawler main body outer peripheral surface 22 Core metal 25 Wing 26 Protrusion 28 First derailment prevention mechanism 29 Second derailment prevention mechanism 33 Insertion hole 33a Insertion hole inner peripheral surface 34 Bonding rubber 35 Insertion protrusion 35a Insertion protrusion outer peripheral surface 35b, 35c Corner 36 Notch

Claims (6)

An endless belt-shaped crawler body made of rubber material;
A plurality of metal cores disposed at intervals in the crawler circumferential direction on the crawler body,
The metal core is a rubber crawler including a wing portion embedded in the crawler main body, and a protrusion protruding from the wing portion toward the inner peripheral surface of the crawler main body,
Of the wing portion and the projection portion, the wing portion is formed by forging, and the projection portion is limited and formed by casting. The rubber crawler according to claim 1,
Either one of the wing part and the projection part is inserted into an insertion hole formed on the other side protruding from the other side, and via a bonding rubber disposed in the insertion hole. And a rubber crawler characterized in that an insertion projection is disposed on the inner peripheral surface of the insertion hole. The rubber crawler according to claim 2,
The insertion hole is formed in the wing portion and penetrates the wing portion in the thickness direction of the crawler body. The rubber crawler according to claim 3,
The rubber crawler characterized in that a gap between the outer peripheral surface of the insertion protrusion and the inner peripheral surface of the insertion hole gradually increases from the inner peripheral surface side to the outer peripheral surface side of the crawler body. The rubber crawler according to claim 3 or 4,
The insertion hole has a rectangular shape in a plan view seen from the outer peripheral surface side of the crawler body,
The insertion protrusion is formed in a quadrangular prism shape, and at least one of the corners is formed with a notch that opens toward the outer peripheral surface of the crawler body. . A rubber crawler according to any one of claims 1 to 5,
A pair of the projecting portions are arranged on the wing portion with an interval in the crawler width direction,
Each of the pair of protrusions protrudes toward one side in the crawler circumferential direction and is located on the inner side of the crawler main body along the crawler width direction, and on the other side in the crawler circumferential direction. And a second anti-derailing mechanism located outside the crawler body along the crawler width direction and protruding toward the
A rubber crawler characterized in that a first wheel removal prevention mechanism and a second wheel removal prevention mechanism between protrusions adjacent in the crawler circumferential direction face each other in the crawler width direction.

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