JP5879076B2 - Rubber crawler manufacturing method and rubber crawler - Google Patents

Description

  The present invention relates to a rubber crawler manufacturing method and a rubber crawler.

2. Description of the Related Art Conventionally, as a rubber crawler, an endless belt-shaped crawler body formed of a rubber material and a plurality of core bars arranged at intervals in the crawler circumferential direction on the crawler body, the core bar is a crawler body. The structure provided with the wing | blade part embed | buried under and the protrusion part which protrudes toward the inner peripheral surface side of a crawler main body from this wing | blade part is known.
In this type of rubber crawler, there are a type in which the wing and the projection are integrally formed by casting, and a type in which the wing and the projection are formed by separate members.

  In the case where the wing and the protrusion are integrally formed by casting, it is necessary to make the mold relatively large for forming the protrusion, and a relatively large amount of metal material is used.

  On the other hand, as a method of manufacturing a rubber crawler in which the wing portion and the projection portion of the core metal are formed by separate members, for example, a method as shown in Patent Document 1 below is known. In this method, a pair of protrusions are provided on the rubber crawler, and these protrusions are connected to each other by a connecting part. Then, a cored bar is formed by connecting a piece formed by integrally forming the protrusion and the connecting part and the wing part with a bolt and a knock pin.

  In this method, the rubber crawler can be easily manufactured by dividing the cored bar as compared with the case where the wing portion and the protruding portion are integrally cast. In addition, the weight of the material used can be reduced.

Japanese Utility Model Publication No. 5-65780

However, in the method of manufacturing a rubber crawler as described in Patent Document 1, the number of parts is increased because bolts and knock pins are used to connect the one part and the wing part, and further, work such as cutting taps for bolts is required. Since it is necessary, there is a problem that it takes time to manufacture.
Further, since it is necessary to cut the tap on the core bar side, the dimension is limited, and the design freedom of the core bar is limited.

  The present invention has been made in view of such circumstances, and provides a rubber crawler manufacturing method and a rubber crawler that can easily form a rubber crawler without being restricted by dimensions.

As a means for solving the above problems, the present invention comprises an endless belt-like crawler body formed of a rubber material, and a plurality of core bars disposed on the crawler body at intervals in the crawler circumferential direction, A method of manufacturing a rubber crawler in which a metal core forms a rubber crawler including 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. In addition, a convex portion is provided on one of the wing portion and the protruding portion, and a protruding portion that protrudes in a direction orthogonal to the axial direction of the convex portion is provided on the convex portion, and the wing portion and the protrusion A forming step of providing a concave portion for allowing the convex portion to enter the other of the portions, an entering step for causing the convex portion to enter the concave portion, and compressing and deforming the other in a direction in which the protruding portion projects. By reducing the diameter of the recess partly, The projecting portion is engaged with the inner wall surface of the recess, have a, a connecting step of connecting the said wings wherein the projections, during the approach step, the protruding portion, the protruding portion into the recess Of the rubber crawler , wherein the protruding portion is brought into contact with an inner wall surface facing the crawler circumferential direction of the inner wall surface of the concave portion during the connecting step. Provide a method.

In this rubber crawler manufacturing method, a convex portion is provided on one of the wing portion and the protruding portion, and a protruding portion is provided on the convex portion so as to project in a direction perpendicular to the axial direction of the convex portion. The wing part and the projection are provided by providing a concave part for allowing the convex part to enter the other of the part and the projecting part, causing the convex part to enter the concave part, and compressing and deforming the other part provided with the concave part in the direction in which the projecting part projects. Since the parts are connected to each other, work such as cutting taps and fastening bolts is reduced and the number of parts is reduced as compared with the case where the wing part and the protruding part are connected using, for example, a knock pin or a fastening member. Thus, the rubber crawler can be easily formed.
Further, since the projecting portion is provided on the projecting portion and the projecting portion is locked to the recessed portion, the projecting portion is prevented from coming off from the recessed portion, and the wing portion and the projecting portion can be reliably connected.
Moreover, since it is not necessary to cut the tap, the design freedom of the core bar can be improved.

Further , during the connecting step, the projecting portion is brought into contact with the inner wall surface of the concave portion, so that rattling between the wing portion and the projecting portion is suppressed, and the impact force applied to the convex portion is suppressed, It is possible to prevent the core metal from being shortened.

Further, during the previous SL enters step, the convex portions, is advanced so that the protruding portion in the recess projects into the crawler circumferential direction, at the connecting step, the protruding portion, of the inner wall surface of said recess since the contact with the inner wall surface facing the crawler circumferential direction, backlash of the crawler circumferential direction between the projections wings suppressed et al is, the impact force applied to the protrusion can be effectively suppressed during traveling, It is possible to reliably prevent the shortening of the mandrel.
The rubber crawler manufacturing method preferably includes a heat treatment step of heat-treating the connection body of the wing portion and the protrusion after the connection step.

In the rubber crawler manufacturing method, in the forming step, the protrusion is formed by casting, the wing is formed by forging, the protrusion is formed on the protrusion, and the recess is formed on the wing. It is preferable to provide it.
In this case, since the wing portion is formed by forging, the strength and wear resistance of the wing portion can be improved as compared with the case where the wing portion is formed by casting, for example. And even if a wing | blade part is made thin, the fall of the intensity | strength of a wing | blade part can be suppressed, a wing | blade part can be reduced in weight, and weight reduction of the whole rubber crawler can be achieved.
In addition, as described above, even if the wing part is thin, a decrease in the strength of the wing part can be suppressed, so that the thickness of the entire rubber crawler is maintained and the wing part is made thin while the crawler body Can be made thicker and the durability of the rubber crawler can be improved.
In addition, since the protrusion is formed by casting, it can be formed with high precision even when the protrusion has a complicated shape, and the degree of freedom in designing the protrusion can be ensured.
Moreover, although a metal with a small specific gravity is usually used for casting, the weight of the metal core can be reduced by using such a metal.
Further, the present invention comprises an endless belt-like crawler body formed of a rubber material, and a plurality of core bars arranged at intervals in the crawler circumferential direction on the crawler body, A rubber crawler comprising: a wing portion embedded in a crawler body; and a projection portion protruding from the wing portion toward the inner peripheral surface side of the crawler body, wherein one of the wing portion and the projection portion And a protruding portion protruding in the crawler circumferential direction is provided, and the protruding portion enters the other of the wing portion and the protruding portion. A first inner wall surface that is provided with a recess and faces the crawler circumferential direction among the inner wall surfaces of the recess is positioned on an outer portion that contacts the projecting portion, and on an inner peripheral surface side of the crawler body from the outer portion. An inner portion, wherein the inner portion is front By projecting to the inside of the concave portion from the outer portion, the step between the inner portion and the outer portion is engaged with the projecting portion from the inner peripheral surface side of the crawler main body. A rubber crawler characterized in that an overhanging portion is locked to the first inner wall surface.

  According to the present invention, a rubber crawler can be easily formed without being restricted by dimensions.

It is a longitudinal cross-sectional view of the rubber crawler which concerns on embodiment of this invention. It is a principal part enlarged view of FIG. It is a longitudinal cross-sectional view which follows the AA line of FIG. It is a figure explaining the process of the manufacturing method which concerns on this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 to 3 show a rubber crawler 20 manufactured by the manufacturing method according to the present invention. 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 L (see FIG. 3). ing. A plurality of lugs 23 project from the outer peripheral surface 21 b of the crawler body 21.

  The cored bar 22 protrudes from the base of the wing part 25 embedded in the crawler body 21 toward the inner peripheral surface 21a side of the crawler body 21 and is spaced from each other in the crawler width direction H. And a pair of projecting portions 26 arranged to be open.

  The wing portion 25 extends along the crawler width direction H, and the pair of protrusions 26 are disposed at the root of the wing portion 25, that is, on the inner side (center side) of the wing portion 25 in the crawler width direction H. ing. In the crawler body 21, a pair of steel cord layers 27 extending in the crawler circumferential direction L are embedded on the outer peripheral surface 21 b side of the crawler body 21 with respect to the wing portion 25.

  The protrusions 26 are covered with a rubber film 32 formed integrally with the crawler body 21, and the top surfaces 26 a of the plurality of protrusions 26 extend along both the crawler width direction H and the crawler circumferential direction L. These top surfaces 26a constitute a pair of left and right wheel passing surfaces extending continuously over the entire circumference in the crawler circumferential direction L. On the wheel passing surface, a roller (not shown) is rolled along with the feed movement along the crawler circumferential direction L of the rubber crawler 20.

  The wing part 25 and the projection part 26 are constituted by separate members, and the cored bar 22 is constituted by connecting the wing part 25 and the projection part 26. The protrusion 26 is integrally provided with a convex portion 35 that protrudes toward the outer peripheral surface 21 b of the crawler main body 21, and the wing portion 25 has a concave portion 33 that opens toward the inner peripheral surface 21 a of the crawler main body 21. Is provided.

  As shown in FIG. 3, the protruding portion 35 is formed with an overhanging portion 40 that protrudes in a direction perpendicular to the axial direction of the protruding portion 35 on the distal end side located on the outer peripheral surface 21 b side of the crawler body 21. . On the other hand, as shown in FIG. 1, a pair of the recessed portions 33 is disposed at a portion corresponding to the protruding portion 26 in the central portion of the wing portion 25 in the crawler width direction H. Further, the concave portion 33 penetrates the wing portion 25 in the thickness direction T of the crawler main body 21.

  As shown in FIG. 3, the first inner wall surface 41 (see FIG. 3) that faces the overhanging portion 40 of the inner wall surface 33 a of the recess 33 has an outer portion 41 a that contacts the overhanging portion 40 of the protrusion 35. Have. On the other hand, as shown in FIG. 2, the second inner wall surface 42 other than the first inner wall surface 41 of the inner wall surface 33 a of the recess 33 is in contact with or close to the convex portion 35. Note that a slight gap is formed between the convex portion 35 and the inner portion 41b located on the inner peripheral surface 21a side of the crawler main body 21 with respect to the outer portion 41a contacting the overhanging portion 40 in the first inner wall surface 41. Is provided. Here, in this embodiment, the overhang | projection part 40 is each protrudingly provided in both directions of the crawler circumferential direction L from the convex part 35, and the 1st inner wall surface 41 faces the crawler circumferential direction L, and 2nd inside The wall surface 42 faces the crawler width direction H.

  In the projection 26, the inner portion 41b of the first inner wall surface 41 of the recess 33 projects beyond the outer portion 41a to the inside of the recess 33, and the step between the inner portion 41b and the outer portion 41a is projected. By engaging with the portion 40 from the inner peripheral surface 21 a side of the crawler main body 21, it is locked so as not to come off to the inner peripheral surface 21 a side of the crawler main body 21. Thereby, the protrusion 26 is connected to the wing 25.

Next, a method for manufacturing the rubber crawler 20 configured as described above will be described.
First, a member forming step is performed in which the wing portion 25 is formed by forging and the protruding portion 26 is formed by casting. At this time, the protruding portion 40 is formed on the convex portion 35 of the projection portion 26.
At this time, the wing portion 25 is formed by die forging of, for example, mild steel, hard steel, or alloy steel, and the protrusion 26 is formed of, for example, cast iron, cast steel, copper alloy, or the like.
Thereby, the wing | blade part 25 in which the recessed part 33 was provided, and the projection part 26 in which the convex part 35 was integrally provided with the same material are formed. The wings 25 and the projections 26 are so-called raw materials that are not heat-treated, and the hardness of the projections 26 and the projections 35 as the raw materials can be, for example, about HB 130 to 250 in Brinell hardness. It is.

  In the wing portion 25 and the projection portion 26 formed as described above, in this example, the portions other than the overhang portion 40 of the convex portion 35 are formed in a columnar shape, and the overhang portion 40 is formed in a rectangular shape in cross section. And formed so as to project in the crawler circumferential direction L. Moreover, the recessed part 33 is formed in the rectangle which can fit the overhang | projection part 40 by cross-sectional view.

  Next, an entering step is performed, and referring to FIG. 4, the protruding portion 35 provided in the protruding portion 26 is protruded into the recessed portion 33 provided in the wing portion 25, and the protruding portion 40 protrudes in the crawler circumferential direction L. To enter.

Next, a connecting step for connecting the wing portion 25 and the protruding portion 26 is performed. Here, as shown by an arrow α in FIG. 4, the wing part 25 provided with the concave part 33 is moved inward along the direction in which the protruding part 40 projects in a state where the convex part 35 enters the concave part 33. 3, the first inner wall surface 41 of the recess 33 is partially reduced in diameter so that the overhanging portion 40 is made to have an inner portion 41b and an outer portion 41a on the first inner wall surface 41 as shown in FIG. Lock to the step between.
In the compression deformation at this time, the wing part 25 is partially compressed and deformed so that the inner part 41b protrudes to the inner side of the recess 33 than the outer part 41a. Moreover, in this connection process, the overhang | projection part 40 is hold | maintained in the state contact | abutted to the outer side part 41a of the 1st inner wall surfaces 41. FIG.
The connection process is thus completed.

  And the heat treatment process which heat-processes the coupling body of the wing | blade part 25 and the projection part 26 is performed, and the mechanical property of the metal core 22 is adjusted, such as improving each hardness and each intensity | strength of the wing | blade part 25 and the projection part 26, for example. . By this heat treatment, the hardness of the wing portion 25 is preferably about HRC 20 to 55 in terms of Rockwell hardness, and the hardness of the protrusion 26 is preferably about HB 250 to 500 in terms of Brinell hardness, for example.

  After forming the cored bar 22 in this manner, the cored bar 22, the steel cord layer 27, and a plurality of rubber layers (not shown) to be the crawler body 21 are laminated together to form a rubber crawler molded body (not shown). After that, the rubber crawler 20 is formed by vulcanizing the formed body.

In the manufacturing method as described above, the projecting portion 26 is provided with the projecting portion 35, the projecting portion 35 is provided with the overhanging portion 40 projecting in a direction perpendicular to the axial direction of the projecting portion 35, and the wing portion 25 is provided. By providing the concave portion 33 for allowing the convex portion 35 to enter, causing the convex portion 35 to enter the concave portion 33, and compressing and deforming the wing portion 25 provided with the concave portion 33 in the direction in which the protruding portion 40 protrudes, Since the projections 26 are connected, for example, parts such as cutting taps and fastening bolts are reduced as compared with the case where the wings 25 and the projections 26 are connected using a knock pin, a fastening member, or the like. The number of points can be reduced, and a rubber crawler can be easily formed.
Further, since the protruding portion 40 is provided on the convex portion 35 and the protruding portion 40 is locked to the concave portion 33, the convex portion 35 is prevented from coming off from the concave portion 33, and the wing portion 25 and the protruding portion 26 are securely connected. Can be linked to.
Moreover, since it is not necessary to cut the tap, the design freedom of the core bar can be improved.

Further, in the above manufacturing method, the protruding portion 35 is caused to enter the recessed portion 33 so that the protruding portion 40 protrudes in the crawler circumferential direction L, and the protruding portion 40 is inserted into the crawler circumferential direction L of the inner wall surface 33 a of the recessed portion 33. It is set as the state contact | abutted to the 1st inner wall surface 41 (outer part 41a) which faces. In this case, rattling in the crawler circumferential direction L between the wing portion 25 and the projection portion 26 can be suppressed, so that the impact force applied to the projection portion 26 during traveling can be effectively suppressed, and the core metal can be shortened. A rubber crawler that can be surely prevented can be provided.
In this embodiment, the outer portion 41a of the first inner wall surface 41 is brought into contact with the overhanging portion 40. However, even when the second inner wall surface 42 is brought into contact with each other, the wing portion 25 and the projection portion 26 are brought into contact with each other. Since the rattling can be suppressed, the impact on the convex portion 35 is reduced.

Moreover, in the said manufacturing method, since the wing | blade part 25 is formed by forge, the intensity | strength and abrasion resistance of the wing | blade part 25 can be improved compared with the case where the wing | blade part 25 is formed by casting, for example. And even if the wing part 25 is made thin, it is possible to suppress a decrease in the strength of the wing part 25, to reduce the weight of the wing part 25, and to reduce the weight of the entire rubber crawler.
Further, as described above, even if the wing portion 25 is thin, a decrease in strength of the wing portion 25 can be suppressed, so that the thickness of the wing portion 25 is reduced while maintaining the same thickness of the entire rubber crawler. Thus, the crawler body 21 can be made thicker, and the durability of the rubber crawler can be improved.
In addition, since the protrusion 26 is formed by casting, it can be formed with high precision even when the protrusion 26 has a complicated shape, and the degree of freedom in designing the protrusion 26 can be ensured. . Moreover, although a metal with a small specific gravity is usually used for casting, the weight of the metal core can be reduced by using such a metal.

  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 concave portion 33 is provided in the wing portion 25 and the convex portion 35 is provided in the projection portion 26. However, the concave portion 33 may be provided in the projection portion 26 and the convex portion 35 may be provided in the wing portion 25.
In addition, the protruding portion 40 may be formed at an arbitrary position on the convex portion 35. However, in order to prevent the wing portion 25 from coming off, the overhanging portion 40 is axially disposed with respect to the inner circumferential surface 21a side end portion of the crawler body 21 of the concave portion 33 in a state where the convex portion 35 enters the concave portion 33. Need to be separated in the direction.
Moreover, in the said embodiment, although the cross-sectional shape of parts other than the overhang | projection part 40 of the convex part 35 is an example circular, it is not limited to this shape, For example, a rectangle etc. may be sufficient. Further, the cross-sectional shape of the overhanging portion 40 may be circular or elliptical.

Further, there is no need for a heat treatment step.
Furthermore, in the said embodiment, in the member formation process, while the wing | blade part 25 was formed by forge and the projection part 26 was formed by casting, it is not restricted to this.
Furthermore, it is possible to reduce the weight of the cored bar 22 by forming the protruding portion 26 with a light weight metal having a specific gravity higher than that of the material forming the wing portion 25. Examples of the light weight metal include aluminum and aluminum alloys. In addition, the hardness of aluminum is about Hv30-130 in Vickers hardness, for example.

Further, the steel cord layer 27 and the rubber film 32 may be omitted.
Furthermore, in the said embodiment, although the wheel passing surface shall be comprised by the top surface 26a of the projection part 26, it is not restricted to this. For example, the wheel passing surface may be formed on the inner peripheral surface side of the crawler main body at a portion located on the outer side in the crawler width direction than each protrusion of the cored bar.

  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 shall be provided with a pair of projection part 26, it is not restricted to this, For example, one projection part is a center part of the crawler width direction in a wing | blade part. The structure provided for may be sufficient.

  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 Rubber Crawler 21 Crawler Main Body 22 Core Bar 25 Wings 26 Protrusions 33 Concavities 35 Convex Parts 40 Overhangs

Claims (4)

An endless belt-like crawler body formed of a rubber material, and a plurality of core bars arranged at intervals in the crawler circumferential direction on the crawler body, the core bars being embedded in the crawler body A rubber crawler manufacturing method for forming a rubber crawler comprising: a wing portion; and a protrusion protruding from the wing portion toward the inner peripheral surface side of the crawler body,
A convex portion is provided on one of the wing portion and the protruding portion, and a protruding portion is provided on the convex portion so as to project in a direction perpendicular to the axial direction of the convex portion. A forming step of providing a concave portion for allowing the convex portion to enter the other,
An approach step of causing the convex portion to enter the concave portion;
The other portion is compressed and deformed in a direction in which the overhanging portion projects to partially reduce the diameter of the concave portion, so that the overhanging portion is locked to the inner wall surface of the concave portion, and the wing portion and the protruding portion And a connecting step for connecting
At the time of the entry step, the convex portion is caused to enter the concave portion so that the protruding portion protrudes in the crawler circumferential direction,
The method of manufacturing a rubber crawler, wherein, in the connecting step, the protruding portion is brought into contact with an inner wall surface facing a crawler circumferential direction of the inner wall surface of the recess. It is a manufacturing method of the rubber crawler according to claim 1,
A method of manufacturing a rubber crawler, comprising a heat treatment step of heat-treating a connection body of the wing portion and the protrusion after the connection step. A method for producing a rubber crawler according to claim 1 or 2,
A rubber crawler characterized in that, during the forming step, the protrusion is formed by casting, the wing is formed by forging, the protrusion is provided on the protrusion, and the recess is provided on the wing. Method. An endless belt-like crawler body formed of a rubber material, and a plurality of core bars arranged at intervals in the crawler circumferential direction on the crawler body, the core bars being embedded in the crawler body A rubber crawler comprising: a wing portion; and a protrusion protruding from the wing portion toward the inner peripheral surface of the crawler body,
One of the wing part and the projection part is provided with a convex part projecting toward the other, and the projecting part is provided with an overhang part projecting in the crawler circumferential direction, and the wing part and the projection part A concave portion into which the convex portion has entered is provided on the other side,
Of the inner wall surface of the recess, the first inner wall surface facing the crawler circumferential direction is an outer portion that contacts the overhanging portion, and an inner portion that is located closer to the inner circumferential surface side of the crawler body than the outer portion, Have
The inner portion projects to the inside of the recess from the outer portion, and a step between the inner portion and the outer portion is engaged with the projecting portion from the inner peripheral surface side of the crawler body. The rubber crawler characterized in that the overhanging portion is locked to the first inner wall surface by joining .

Images