JP2012144143A - Rubber crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber crawler in which the parts count is reduced and which is formed easily.SOLUTION: The rubber crawler 20 includes: an endless belt-like crawler body 21 formed with a rubber material; and a plurality of core bars 22 arranged in the crawler body 21 at intervals in the peripheral direction of the crawler. Each of the core bars 22 includes: a wing part 25 buried in the crawler body 21; and a projection part 26 projected from the wing part 25 toward the side of the inner peripheral surface 21a of the crawler body 21. A housing concave part 27 opened toward the side of the outer peripheral surface 21b of the crawler body 21 is formed in the wing part 25. An insertion hole 28, which is opened toward the side of the inner peripheral surface 21a of the crawler body 21 and into which the projection part 26 is inserted, is formed on the bottom surface 27b of the housing concave part 27. The projection part 26 is mounted on a housed part 29, which is housed to be arranged on the bottom surface 27b in the housing concave part 27, while being projected toward the side of the inner peripheral surface 21a of the crawler body 21.

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-shaped crawler body formed of a rubber material and the crawler body are disposed at intervals in the crawler circumferential direction. A configuration including a plurality of core bars is known. In this rubber crawler, the cored bar includes a wing portion embedded in the crawler body, and a pair of protrusions that protrude from the wing portion toward the inner peripheral surface side of the crawler body and are spaced apart in the crawler width direction. And a section. And the piece part by which a pair of projection part and the connection part which connects these projection parts are formed integrally is formed in another member different from a wing part, and these piece part and wing part Are connected to each other by a bolt and a knock pin to form a cored bar.

Japanese Utility Model Publication No. 5-65780

  However, since the conventional rubber crawler uses bolts and dowel pins to connect the one part and the wing part, the number of parts is large, and work such as cutting taps for bolts is necessary to assemble the cored bar. There is a problem that it takes time and effort.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a rubber crawler that can be easily formed while reducing the number of components.

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 protrusion protruding from the wing portion toward the inner peripheral surface of the crawler body, wherein the wing portion includes the crawler body A storage recess that opens toward the outer peripheral surface of the crawler body is formed on the bottom surface of the storage recess, and an insertion hole that opens toward the inner peripheral surface of the crawler body and through which the protrusion is inserted is formed. The projecting portion is characterized in that a projecting portion is provided to project toward the inner peripheral surface side of the crawler body in a housing portion that is disposed and housed on the bottom surface in the housing recess.

According to the present invention, since the protruding portion protrudes from the stored portion toward the inner peripheral surface side of the crawler main body, in the process of forming the rubber crawler, the connection between the protruding portion and the stored portion is performed. By inserting the body into the storage recess of the wing portion from the outer peripheral surface side of the crawler body, inserting the protrusion through the insertion recess and the insertion hole, and storing the storage portion in the storage recess, the coupling body and the wing The core can be formed by assembling the parts.
In this way, since the cored bar can be formed by allowing the coupling body to enter the housing recess of the wing part from the outer peripheral surface side of the crawler body, the wing part and the projecting part can be formed using, for example, a knock pin or a fastening member. Compared with the case where it connects, it can form easily while reducing the number of parts.

In addition, since the storage portion is stored in the storage recess and is sandwiched between the wing portion and the portion of the crawler body located on the outer peripheral surface side of the wing portion, the coupling body rattles the wing portion. Can be suppressed, the shape of the cored bar can be stabilized, and vibration can be reduced.
Further, since the cored bar is formed by assembling the coupling body and the wing part, for example, when this rubber crawler is regenerated, even if one of the projection part and the wing part is damaged, the other is re-introduced. Can be used.

  Further, the wing portion may be formed by forging, and the connection body between the projection and the storage portion may be formed by casting.

In this case, since the wing part is formed by forging, it becomes possible to reduce the weight of the wing part while ensuring the strength of the wing part, for example, compared to the case where the entire core metal is formed by casting, The weight of the entire rubber crawler can be reduced.
In addition, since the weight of the wings can be reduced in this way, it is possible to make the wings thinner and thicker the crawler body while suppressing the weight of the entire rubber crawler. The durability of this rubber crawler Can be improved.
Furthermore, as mentioned above, the strength of the wings can be secured, so that when the load is applied to the core from the inner peripheral surface side of the crawler body, this load can be reliably received by the wings. Thus, the durability of the rubber crawler can be further improved.

In addition, since the connecting body is formed by casting, even if the connecting body has a complicated shape, it can be easily formed with high accuracy, and the degree of freedom in designing the connecting body can be ensured. Can do.
In addition, since the connecting body is formed by casting in this way, even when the connecting body has a complicated shape, it is possible to reduce the material used compared to the case where it is formed by forging, for example. Thus, the cost can be reduced.
Furthermore, since the connection body is formed by casting as described above, residual stress is unlikely to occur in the connection portion of the protrusion portion with the receiving portion, and the durability of the protrusion portion can be improved.

  In addition, a rubber layer may be disposed between the storage portion and the bottom surface of the storage recess.

  In this case, since the rubber layer is disposed between the storage portion and the bottom surface of the storage recess, the connection body is further prevented from rattling against the wing portion, and the shape of the core bar is further stabilized. Further vibration reduction can be achieved.

  According to the rubber crawler according to the present invention, the number of parts can be reduced and the rubber crawler can be easily formed.

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 longitudinal cross-sectional view along the crawler width direction of the rubber crawler shown in FIG. It is a top 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 which concerns on the modification of one Embodiment of this invention. It is a top view of the metal core with which the rubber crawler shown in FIG. 4 is provided.

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), respectively. 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.

The rubber crawler 20 includes an endless belt-like crawler main body 21 formed of a rubber material, and a plurality of core bars 22 disposed on the crawler main body 21 at intervals in the crawler circumferential direction.
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.

  As shown in FIG. 2, the wing portion 25 is formed in a plate shape whose front and back surfaces extend in the crawler width direction H and the crawler circumferential direction, and as shown in FIG. The planar view shape of the wing portion 25 viewed from the inner peripheral surface 21a side is a rectangular shape that is long in the crawler width direction H.

  A storage recess 27 that opens toward the outer peripheral surface 21 b of the crawler main body 21 is formed at the center of the wing 25 in the crawler width direction H. The shape of the storage recess 27 in plan view is a rectangular shape that is long in the crawler width direction H. The storage recess 27 is closed from both sides in the crawler circumferential direction and from both sides in the crawler width direction H. 27a extends continuously over the entire circumference.

  As shown in FIG. 2, an insertion hole 28 that opens toward the inner peripheral surface 21 a side of the crawler main body 21 and through which the protrusion 26 is inserted is formed in the bottom surface 27 b of the storage recess 27. A pair of insertion holes 28 are arranged at intervals in the crawler width direction H, and as shown in FIG. 3, the pair of protrusions 26 inserted through these insertion holes 28 are positioned in the crawler circumferential direction. They are equivalent to each other.

  In the present embodiment, as shown in FIG. 2, the protruding portion 26 is placed on the inner peripheral surface 21 a side of the crawler main body 21 in the receiving portion 29 that is placed and stored on the bottom surface 27 b in the receiving recess 27. Projected toward.

  The storage portion 29 is formed in a plate shape whose front and back surfaces extend along both the crawler width direction H and the crawler circumferential direction, and the planar view shape of the storage portion 29 is long in the crawler width direction H. In addition, the storage recess 27 has a rectangular shape slightly smaller than the planar view shape. In this embodiment, the back surface facing the outer peripheral surface 21b side of the crawler main body 21 in the accommodated portion 29 is closer to the inner peripheral surface 21a side of the crawler main body 21 than the back surface facing the outer peripheral surface 21b side of the crawler main body 21 in the wing portion 25. The entire portion to be stored 29 is stored in the storage recess 27.

  In addition, the protruding portion 26 protrudes from a surface 29b facing the inner peripheral surface 21a of the crawler body 21 in the stored portion 29, and between the surface 29b and the bottom surface 27b of the storing recess 27, The rubber layer 30 is disposed without a gap. Further, the side surface 29 a of the storage portion 29 and the side surface 27 a of the storage recess 27 are slightly separated from each other, and the crawler body 21 is between the side surface 29 a of the storage portion 29 and the side surface 27 a of the storage recess 27. And the rubber layer 30 are disposed with no gap between them.

  The wing portion 25 configured as described above is formed by forging, and the coupling body 32 between the projection portion 26 and the accommodated portion 29 is formed by casting. The wing portion 25 is formed by die forging of, for example, mild steel, hard steel, alloy steel, and the hardness thereof is, for example, about HRC 20-60 in terms of Rockwell hardness. The coupling body 32 is formed of, for example, cast iron, cast steel, copper alloy, aluminum alloy, or the like, and the hardness thereof is, for example, about BB 250 to 500 in Brinell hardness.

  Here, as shown in FIG. 1, on the inner peripheral surface 21 a side of the crawler main body 21, there are a plurality of rolling wheels that are rotatably supported by the vehicle frame in a portion located between the driving wheel 11 and the driven wheel. 12 is arranged. Each roller 12 rolls on the roller passing surface S formed on the inner peripheral surface 21 a side of the crawler body 21 and extending over the entire circumference in the crawler circumferential direction as the rubber crawler 20 moves. In the present embodiment, the wheel passing surface S is continuous in the crawler circumferential direction on the inner circumferential surface 21a side of the crawler main body 21 at a portion located on the outer side in the crawler width direction H with respect to each protrusion 26 of the cored bar 22. Is formed.

  Among the plurality of wheels 12, a part of the inner peripheral surface 21a of the crawler main body 21 that is located on the lower side, which is the ground side, is supported from the upper side, and the rest is the inner peripheral surface 21a of the crawler main body 21. The upper part is supported from the lower side. The former roller 12 presses the lower portion of the outer peripheral surface 21b of the crawler body 21 against the ground, and the latter roller 12 supports the upper portion of the crawler body 21 so as not to loosen. .

  In the present embodiment, the steel cord layer 33 continuously extending in the crawler circumferential direction is provided at the central portion in the crawler width direction H on the outer peripheral portion 21c located on the outer peripheral surface 21b side of the wing 25 in the crawler body 21. A pair is embedded with a gap.

Next, an example of a manufacturing method of the rubber crawler 20 configured as described above will be described.
First, the core 32 is formed by assembling the connecting body 32 and the wing part 25.
At this time, in this embodiment, first, a through hole (not shown) through which the protrusion 26 is inserted is formed, and an unvulcanized rubber sheet (not shown) to be the rubber layer 30 is formed by vulcanization. And the protrusion part 26 of the connection body 32 is penetrated to the said through-hole of this rubber sheet, and the said rubber sheet is arrange | positioned on the surface 29b of the to-be-stored part 29 in the connection body 32.

  Thereafter, the connecting body 32 is caused to enter the storage recess 27 of the wing portion 25 from the outer peripheral surface 21b side of the crawler body 21 so that the projection 26 is inserted through the storage recess 27 into the insertion hole 28 and the storage portion 29 is stored. The metal core 22 is formed by being housed in the recess 27. Here, in the present embodiment, since the side surface 29a of the storage portion 29 and the side surface 27a of the storage recess 27 are slightly separated and there is play, the storage portion 29 can be stored smoothly in the storage recess 27. it can.

Thereafter, a laminated body (not shown) in which the core bar 22, the steel cord layer 33, and the unvulcanized rubber member (not shown) to be the crawler body 21 are stacked is placed in a mold (not shown) and heated. Vulcanize. At this time, for example, the laminated body is disposed in the mold with the core metal 22 reversed, and the rubber is inserted into the gap between the side surface 29 a of the storage portion 29 and the side surface 27 a of the storage recess 27. Filling rubber 31 is formed by allowing the member to enter.
Thus, the rubber crawler 20 is formed.

  As described above, according to the rubber crawler 20 according to the present embodiment, the cored bar 22 is formed by causing the coupling body 32 to enter the housing recess 27 of the wing portion 25 from the outer peripheral surface 21b side of the crawler main body 21. Therefore, compared with the case where the wing | blade part 25 and the projection part 26 are connected, for example using a knock pin, a fastening member, etc., while reducing a number of parts, it can form simply.

  In addition, since the receiving portion 29 is housed in the housing recess 27 and is sandwiched between the wing portion 25 and the outer peripheral side portion 21c of the crawler body 21, the coupling body 32 rattles against the wing portion 25. As a result, the shape of the cored bar 22 can be stabilized and vibration can be reduced.

In addition, since the rubber layer 30 is disposed between the surface 29b of the storage portion 29 and the bottom surface 27b of the storage recess 27, the connecting body 32 is further suppressed from rattling against the wing portion 25, and the core metal While making the shape of 22 more stable, it is possible to further reduce the vibration.
Furthermore, in this embodiment, since the filling rubber 31 is disposed between the side surface 29 a of the storage portion 29 and the side surface 27 a of the storage recess 27, the coupling body 32 is in the crawler width direction H and the wing portion 25. It is possible to effectively suppress rattling in the crawler circumferential direction, to further stabilize the shape of the cored bar 22, and to further reduce vibration.

Further, as described above, the accommodated portion 29 is sandwiched between the wing portion 25 and the outer peripheral side portion 21c of the crawler main body 21, so that when the crawler type traveling body 10 travels, the connecting portion is connected from the wing portion 25. 32 can be prevented from leaving.
That is, when the crawler type traveling body 10 is traveling, the rubber crawler 20 is fed and moved, so that the core bar 22 is in an upright position in which the protruding portion 26 protrudes upward from the wing portion 25 or in a downward direction. It changes to the reverse posture which protrudes toward. Here, since the accommodated portion 29 is sandwiched between the wing portion 25 and the outer peripheral portion 21c of the crawler main body 21, when the cored bar 22 is in the upright posture, the connecting body 32 is connected to the outer peripheral portion 21c. When the core bar 22 is in the inverted posture, the connecting body 32 can be supported from the lower side by the wing part 25, and the connecting body 32 can be prevented from being detached from the wing part 25. it can.

  Furthermore, since the cored bar 22 is formed by assembling the coupling body 32 and the wing part 25, for example, when the rubber crawler 20 is regenerated, one of the projection part 26 and the wing part 25 is temporarily damaged. However, the other can be reused.

Further, since the wing portion 25 is formed by forging, for example, it is possible to reduce the weight of the wing portion 25 while ensuring the strength of the wing portion 25 as compared with the case where the entire cored bar 22 is formed by casting. Thus, the overall weight of the rubber crawler 20 can be reduced.
Further, since the weight of the wing portion 25 can be reduced as described above, the wing portion 25 can be made thin and the crawler main body 21 can be made thick while suppressing the weight of the rubber crawler 20 as a whole. The durability of the crawler 20 can be improved.
Further, as described above, since the strength of the wing portion 25 can be ensured, when the load is applied to the core metal 22 from the inner peripheral surface 21a side of the crawler main body 21, this load is surely received by the wing portion 25. The durability of the rubber crawler 20 can be further improved.

Further, since the connecting body 32 is formed by casting, even if the connecting body 32 has a complicated shape, it can be formed with high precision and ease, and the degree of freedom in designing the connecting body 32 can be increased. Can be secured.
In addition, since the coupling body 32 is formed by casting as described above, even when the coupling body 32 has a complicated shape, the material used is reduced as compared with the case where the coupling body 32 is formed by forging, for example. Therefore, the cost can be reduced.
Furthermore, since the connecting body 32 is formed by casting as described above, it is difficult for residual stress to be generated in the connecting portion of the protruding portion 26 with the accommodated portion 29, and the durability of the protruding portion 26 can be improved. Thereby, it can suppress effectively that the projection part 26 bends with the said connection part as a base point, or a crack generate | occur | produces in the projection part 26 at the time of processes, such as heat processing.

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 formed on the inner peripheral surface 21 a side of the crawler main body 21 at a portion located on the outer side in the crawler width direction H with respect to the protrusions 26 of the cored bar 22. However, the present invention is not limited to this, and the wheel passing surface S may be configured by the top surface of the protrusion 26 as in the rubber crawler 40 shown in FIGS. 4 and 5.

Further, as shown in FIG. 5, the positions of the pair of protrusions 26 in the crawler circumferential direction may be shifted from each other, and the storage recess 27 and the insertion hole 28 may be opened in the crawler circumferential direction.
As shown in FIG. 5, when the protrusion 26 protrudes outward in the crawler circumferential direction from the wing 25, the storage recess 27 corresponds to the protrusion 26 a of the protrusion 26 in the crawler circumferential direction. When the protrusion 26 is inserted into the insertion hole 28 through the storage recess 27 by opening the insertion hole 28 in the crawler circumferential direction, the protrusion 26a of the protrusion 26 is inserted into the storage recess 27 and the insertion hole 28, respectively. It can be smoothly moved through the opening portions 27c and 28c opened in the crawler circumferential direction.

Further, the filling rubber 31, the rubber layer 30, and the steel cord layer 33 may be omitted.
Furthermore, in the said embodiment, while the wing | blade part 25 was formed by forging and the connection body 32 shall be formed by casting, it is not restricted to this.

  Further, the cored bar may be provided with a derailment prevention mechanism that regulates relative displacement between the cored bars adjacent to each other in the crawler circumferential direction in the crawler width direction. As an example of the derailment prevention mechanism, a first mechanism that protrudes from the core bar toward one side in the crawler circumferential direction and is located inside the crawler main body along the crawler width direction, and the other one in the crawler circumferential direction from the core bar And a second mechanism located on the outer side of the crawler body along the crawler width direction, and the first mechanism and the second mechanism between the core bars adjacent in the crawler circumferential direction are crawlers. The structure which opposes in the width direction etc. are mentioned.

  Moreover, in the said embodiment, although the metal core 22 was provided with a pair of projection part 26, it is not restricted to this, For example, one projection part is the center of the crawler width direction H in a wing | blade part. The structure with which a part is equipped may be sufficient. In this case, for example, instead of the meshing hole 24, a space between adjacent projections in the crawler circumferential direction may be a meshing recess for the drive wheel.

  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.

20, 40 Rubber crawler 21 Crawler body 21a Inner peripheral surface 21b Outer peripheral surface 22 Core metal 25 Wings 26 Projection 27 Storage recess 27b Bottom 28 Insertion hole 29 Stored part 30 Rubber layer 32 Linked body

Claims (3)

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,
The wing portion is formed with a storage recess that opens toward the outer peripheral surface side of the crawler body, and the bottom surface of the storage recess opens toward the inner peripheral surface side of the crawler main body and the protrusion portion. Insertion hole is formed,
The rubber crawler according to claim 1, wherein the protruding portion protrudes toward an inner peripheral surface side of the crawler main body in a receiving portion that is arranged and stored on the bottom surface in the storage recess. The rubber crawler according to claim 1,
The wing portion is formed by forging, and the coupling body between the protruding portion and the receiving portion is formed by casting. The rubber crawler according to claim 1 or 2,
A rubber crawler, wherein a rubber layer is disposed between the receiving portion and the bottom surface of the receiving recess.

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