JP4348106B2 - Rubber crawler molding method and rubber crawler - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rubber track used in a traveling part of a vehicle, and particularly relates to an improvement of a protrusion protruding from an inner peripheral surface of the rubber track.
[0002]
[Prior art]
Generally, protrusions are continuously formed on the inner peripheral surface of the rubber crawler in the longitudinal direction, and these protrusions are used for transmission of driving force from the sprocket or function to prevent disengagement from the wheel. is doing. Especially for preventing slippage between the rollers, if the rubber crawler receives a lateral force and causes a relative displacement with the rollers, contact the rollers with the protrusions. The collision will be repeated and this deviation will be restored. For this reason, a frictional force is applied to the protrusions, causing a wheel to be removed from the wheel, and further causing wear and breakage. This is not only caused by the rolling wheels, but also applies to the driving wheels and the idle wheels.
[0003]
FIG. 1 has been proposed for this problem (Patent Document 1). In particular, since the left and right inclined surfaces 30a of the rubber protrusion 30 are worn, the left and right sides of the rubber protrusion 30 are dealt with. A low-abrasion plastic member 40 is embedded therethrough. The left and right ends 40a of the plastic member 40 are in contact with a wheel (hereinafter described with the wheel) to protect the protrusion.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-53171
However, the left and right inclined surfaces 30a of the rubber protrusions 30 and the left and right end surfaces of the low wear member 40 are preferably in the same plane, but in many cases, the low wear members 40 protrude from the left and right inclined surfaces 30a of the rubber protrusions 30. This is because the cost of the low-abrasion member 40 is reduced, the shape of the rubber protrusion (the left and right surfaces are slanted), and the rubber crawler molding mold (particularly the shape that generates the rubber protrusion). In general, the left and right tips 40a of the low-abrasion member 40 are not particularly cut obliquely, but are used as they are, and are set in grooves formed in a mold cavity for forming the rubber protrusions 30. There is a structure in which the left and right ends 40 a of the low wear member 40 protrude from the left and right inclined surfaces of the rubber protrusion 30 by the amount of the groove.
[0006]
Therefore, the contact with the wheel is mainly the protruding end 40a of the low wear member 40. For this reason, the wear of the side surface 30a of the rubber protrusion 30 is certainly reduced, but a different problem occurs. That is, since a large external force is applied to the low-abrasion member 40, the low-abrasion member 40 is lost, and the low-abrasion member 40 is moved in the rubber, and the adhesion at the interface with the rubber is peeled off. There is also a disadvantage that the rubber protrusion 30 is lost as a result of sand and pebbles entering here.
[0007]
Therefore, it is preferable that the left and right end surfaces 40a of the low wear member 40 be aligned with the left and right surfaces 30a of the rubber protrusions 30 as much as possible. However, it is inevitable that the low wear member 40 rotates due to the flow of rubber during molding. When the left and right surfaces 40a are cut at an angle, the low wear member 40 is not allowed to rotate and must be set at a very specific position, which complicates the manufacturing process and increases costs. Was inevitable.
[0008]
[Problems to be solved by the invention]
The present invention is intended to improve the drawbacks of the low wear member embedded in the conventional rubber protrusion as described above. Even when the left and right ends of the low wear member are cut obliquely, the predetermined position of the protrusion is determined. The technology to make it completely set.
[0009]
[Means for Solving the Problems]
The gist of the present invention is that a molding mold (A) having an inner peripheral surface of a rubber crawler and having a recess at the center for forming a rubber projection at a constant pitch, and a molding model for partitioning the outer peripheral surface of the rubber crawler. -Mold (B), forming a molding cavity, various materials constituting a rubber crawler, and a rubber crawler molding method in which these are embedded and filled with a rubber material and vulcanized, forming mode - field (a) and a lower die, it forms a protrusion on the right and left inclined surface of the recess, this so as to form the same inclined plane as the left and right inclined surfaces of the front Symbol recess to the left or right of the low wear member A rubber formed by forming a recess to be fitted with the protrusion on the inclined surface, fitting the recess of the low wear member into the protrusion on the inclined surface, and filling the molding cavity with an unvulcanized rubber material. This is a crawler forming method. Moreover, it is a rubber crawler shape | molded using the rubber crawler shaping | molding method of any one of Claims 1-3.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention employs the above-described configuration, particularly in a protrusion that is always engaged / contacted with the wheel, on the left and right side portions where contact / collision with the wheel and other members are repeated. The low wear member is exposed without protruding from the surface. Therefore, even when the deviation of the wheel is controlled, it is possible to obtain a rubber crawler that improves the wheel-removing property between the protrusion and the wheel, reduces wear of the protrusion, and has low running resistance. It has been decided that
[0011]
As the resin member constituting the low wear member used in the present invention, 6 nylon, 6, 6 nylon, polyurethane, polyacetal, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polycarbonate , Polystyrene, acrylonitrile butadiene styrene copolymer resin, polyvinyl chloride, polyvinyl acetate, polyethylene and the like, among which 6-nylon, 6, 6 nylon, polyurethane, polyacetal and polypropylene are preferably used. A resin reinforced with glass fiber is also applicable. Furthermore, as the shape of the resin member, a member having an arbitrary shape such as a rod-like body, a plate-like body, a tubular body, a disk-like body, or a dumbbell-like body can be used. Of course, the low-abrasion member is provided with an inclined surface that matches the left and right inclined surfaces of the rubber protrusion, and the inclined surface has a recess fitted to the protrusion provided in the mold recess forming the rubber protrusion. Thus, there is no movement such as rotation of the low wear member during molding, and the member at a predetermined position is buried.
[0012]
If it adds about the molding method of a rubber crawler, the steel cord as a tension reinforcement member will be arrange | positioned in a shaping | molding cavity, and another auxiliary canvas etc. will also be arrange | positioned as needed. The rubber material is vulcanized from the front, rear, left, and right, and a recess that forms a protrusion is formed in the mold that defines the inner peripheral side, and a lug is formed in the mold that defines the outer peripheral side. A depression is provided.
[0013]
【Example】
Hereinafter, the present invention will be described in more detail based on examples.
2 is a plan view of a low wear member (6, 6 nylon) 20 used in the rubber track of the present invention, FIG. 3 is a front view, FIG. 4 is a side view, and FIG. is there. In this example, the center 20a is slightly finer, the left and right bars 20b are thick, and the cross section is a round member. A reinforcing projection 20c is formed on the upper portion of the center 20a. The side surfaces of the left and right rod bodies 20b have substantially the same inclined surfaces 20d as the rubber protrusions. In this example, the central portion is a slightly bulging curved portion, and a dent 20e is formed in a key shape from the top. . The inclined surface 20d has a shape that matches the inclined surface of the rubber protrusion.
[0014]
FIG. 6 is a main cut view of molding molds (A) and (B) for molding a rubber crawler. The molding mold (A) defines the inner peripheral surface of the rubber crawler and is constant at the center. This is provided with a recess 10 that forms a rubber protrusion with a pitch, and this is usually a lower mold. On the other hand, the molding mold (B) defines the outer peripheral surface of the rubber crawler. A key-like protrusion 10b is formed on the left and right inclined surface 10a of the recess 10.
[0015]
Then, as shown in FIG. 7, the key-like protrusion 10b formed on the left and right inclined surface 10a of the recess 10 is fitted with the recess 20e of the low wear member 20, and the left and right inclined surface 10a of the recess 10 and the low wear member 20 are inserted. And the low wear member 20 is prevented from rotating.
[0016]
After maintaining this state, the molding cavity is filled with an unvulcanized rubber material, and then this is vulcanized and molded to complete a rubber crawler. FIG. 8 is a sectional view of the obtained rubber crawler. 1 is the rubber crawler obtained, 2 is a rubber protrusion, and 3 is a lug. A steel cord 4 is embedded in the longitudinal direction of the rubber crawler 1. Now, the low-wear member 20 is embedded in the rubber protrusion 2, and this low-wear member 20 is embedded in the rubber without rotating during molding, and the left and right inclined surfaces 2 a and 2 b of the rubber protrusion 2 and the low-wear member 20 are embedded. The left and right inclined surfaces 20d are the same surface. The inclined surface 20d is exposed with a recess 20e for fitting with the key-like protrusion 10b, but this is a configuration that has no problem in the performance of the rubber crawler.
[0017]
The low-abrasion member 20 is placed in the recess 10 and is obtained by filling the cavity with a rubber material constituting the base of the rubber tracker while maintaining this state. However, in some cases, the adhesive may be vulcanized and bonded using one or a combination of phenolic, epoxy and rubber adhesives.
[0018]
The left and right inclined surfaces 20d of the low wear member 20 are exposed without protruding on both side surfaces 2a, 2b of the rubber projection 2, and contact with these when contacting or colliding with a wheel, idler, sprocket or the like. Due to the characteristics of the low-abrasion member 20, the wheel slippage between them is reduced, the wear and breakage is reduced, the running resistance is remarkably reduced, and the generation of vibration and noise is also reduced. . Of course, the interface between the rubber and the rod is hardly peeled off, which greatly contributes to the improvement of the life of the rubber crawler.
[0019]
【The invention's effect】
The present invention employs the above-described configuration, and even when the left and right ends of the low wear member are cut obliquely, the low wear member can be completely set at a predetermined position of the protrusion. Further, the present invention is a rubber crawler formed in the above-described configuration, which is a rubber protrusion that repeatedly contacts and collides with a roller provided on the fuselage side of the rubber crawler, and has a special property. The wear member is exposed. For this reason, even if contact / collision due to misalignment with the rolling wheels occurs, wear and damage are extremely reduced, and running resistance is also reduced, and the life of the rubber crawler is remarkably improved. .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a rubber protrusion of a conventional rubber crawler.
FIG. 2 is a plan view of a low wear member used in the rubber track of the present invention.
FIG. 3 is a front view of FIG. 2;
4 is a side view of FIG. 2. FIG.
FIG. 5 is a cross-sectional view taken along line CC in FIG.
FIG. 6 is a main cutaway view of a molding mold for molding a rubber crawler.
FIG. 7 is a view showing a relationship between a molding mold (A) and a low wear member.
FIG. 8 is a cross-sectional view of the obtained rubber crawler.
[Explanation of symbols]
A, B Molds for molding rubber crawlers,
10 depressions that form rubber protrusions,
10a Left and right inclined surfaces of the depression,
10b Key-shaped protrusions formed on the inclined surface of the depression,
20 low wear parts,
20d Left and right inclined surfaces of the low wear member,
20e A recess formed in the left and right inclined surfaces of the low wear member.

Claims (4)

A molding mold (A) having a recess that forms an inner peripheral surface of the rubber crawler and forming rubber projections at a constant pitch at the center thereof, and a molding mold (B) that partitions the outer peripheral surface of the rubber crawler , And forming a molding cavity, various materials constituting a rubber crawler, and a rubber crawler molding method in which these are embedded and filled with a rubber material and vulcanized,
The molding mold (A) is a lower mold, and protrusions are formed on the left and right inclined surfaces of the depression,
Forming a recess for the projection and fitted to the inclined surface so as to form the same inclined plane as the left and right inclined surfaces of the front Symbol recess to the left or right of the low wear member,
A rubber crawler molding method, wherein a recess of the low-abrasion member is fitted into the protrusion on the inclined surface, and an unvulcanized rubber material is filled into the molding cavity, which is vulcanized.   The method for molding a rubber crawler according to claim 1, wherein the left and right inclined surfaces of the low wear member are aligned with the left and right inclined surfaces of the rubber protrusions. The rubber crawler molding method according to claim 1 or 2, wherein the low wear member is a resin member selected from 6 nylon, 6, 6 nylon, polyurethane, polyacetal, polypropylene, and polyethylene . A rubber crawler formed using the method for forming a rubber crawler according to any one of claims 1 to 3.

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