JP4138072B2 - Crawler and its cord winding method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a crawler comprising an endless elastic rubber belt or the like in which a reinforcing cord is embedded and used in a high-speed snow vehicle such as an RV vehicle or a construction vehicle.
[0002]
[Prior art]
In recent years, there are an increasing number of cases in which a normal driving wheel in a leisure RV vehicle is removed and an endless track driving device composed of a driving wheel and a plurality of wheels is attached and used as a snow vehicle or the like. A crawler made of an endless elastic rubber belt or the like is attached to such an endless track drive device. However, as the crawler is attached to an RV vehicle, it is urgently necessary to cope with an increase in traveling speed. . Further, not only ordinary snow vehicles, but also construction vehicles and the like that have come to be equipped with rubber crawlers that reduce noise, vibration, etc., are required to cope with higher speeds of crawlers.
In general, a crawler to be mounted on such an endless track drive device sandwiches a structure made of a belt-like rubber or the like with a reinforcing cord embedded between upper and lower molds (molds), and further places the upper and lower parts on an external heating plate. And vulcanize by sandwiching and heating by the internal heating plate, then superimpose the staggered both ends of the crawler, and vulcanize and join both ends by the upper and lower molds for end joining and the internal and external heating discs And endless crawler products.
[0003]
Alternatively, a relatively long crawler is vulcanized by a manufacturing method called feed vulcanization. The crawler structure consisting of a long belt-like rubber with embedded reinforcing cords is sandwiched between upper and lower molds of a relatively short predetermined length, and the upper and lower sides thereof are further sandwiched between an external heating plate and an internal heating plate. After heating, the part of the crawler of a predetermined length is vulcanized, and this is repeated in sequence to vulcanize the entire length of the crawler, and then the staggered ends of the crawler are superposed to create a top and bottom mold and internal and external heating plates. Both ends were vulcanized and joined to obtain an endless crawler product.
[0004]
In these vulcanized manufacturing methods, both ends of the belt-like crawler must be vulcanized, and it is impossible for the endless ring-shaped crawler to have all the uniform characteristics on the circumference. In addition, the connecting process between the end portions of the reinforcing cords that are embedded in parallel in the length direction is troublesome and there is a possibility that the continuity in the reinforcing strength may be cut off. Furthermore, it was impossible to embed a spiral reinforcing cord that enables uniform reinforcing strength on the circumference.
For this reason, the conventional vulcanization manufacturing method cannot cope with the high speed rotation of the crawler accompanying the increase in the speed of the vehicle.
[0005]
Therefore, the present applicant can solve the problems in the conventional molding and vulcanization methods as described above, and can provide a uniform strength characteristic on the circumference with a small number of steps, and can cope with high speed running. A seamless crawler molding method (see Japanese Patent Application Laid-Open No. 9-76369) that enables the embedding of a spiral reinforcing cord in a rubber crawler and the like, a crawler molding apparatus relating to the inner mold and release of the inner mold, and a molding method thereof (special feature) No. 9-355208 ( Japanese Patent Laid-Open No. 11-179731 ) has been proposed.
With these molding methods, the number of processes is small, and it is possible to embed spiral reinforcement cords and provide uniform strength characteristics on the circumference, which can handle high-speed running and uniform and reliable outer mold pressurization. A seamless crawler was provided.
The steel cord disclosed in Japanese Patent Application Laid-Open No. 8-57978 previously proposed by the applicant of the present application is also proposed as a uniform high function can be added by such a seamless crawler molding apparatus or vulcanization method. There is a way.
[0006]
A steel cord manufacturing method disclosed in Japanese Patent Application Laid-Open No. 8-57978 will be briefly described with reference to FIG. 7. A drum body in which a large number of driving rollers 13 and idle rollers 14 are connected to form a loop. The steel cord W0 from the steel cord supply machine 20 is supplied and wound in a spiral shape at a constant pitch under a constant tension.
The steel cord feeder 20 includes a reel 21 around which a steel cord W0 is wound, a tension device 22, and a traverser 23. The traverser 23 moves in parallel with respect to each of the rollers erected on the bases 11 and 12. It is configured to be possible. The tip of the steel cord W0 is fixed by an arbitrary gripping device (not shown), the bases 11 and 12 are rotated together, and the steel cord W0 is supplied from the traverser 23 to each roller. The steel cord W0 is wound around each roller with the movement of the traverser 23 and the groove interval (constant pitch) of the rubber roller 15.
Unsteered rubber sheets (treat rubber) 35 and 36 supplied from the treat rubber supplier 30 are attached to the front and back surfaces of the steel cord row W.
Reference numerals 31 and 32 denote pressure-bonding rollers for pressure-treating the treat rubbers 35 and 36 to the front and back of the steel cord row W.
The steel cord row W may be a rubberized cord covered with rubber G for each turn as shown in FIG. 7 (B), or the front and back sides of the full width steel cord row W as shown in FIG. 7 (C). It may be a rubberized cord coated with rubber G.
[0007]
[Problems to be solved by the invention]
The crawler in which the cord wound spirally by such a steel cord manufacturing method is configured as shown in FIG. 8, and there is no possibility of abnormal rigidity or steel cord cutting, and it is more uniform on the circumference. It was able to withstand high speed driving.
FIG. 8A shows a crawler in which a so-called Z-winding cord in which a cord 42 is spirally wound around the endless crawler 41, for example, from the lower left of the drawing to the right of the drawing only by right-hand winding. Is configured.
However, a predetermined winding tension T acts on both ends of the cord 42 wound in the Z-winding spiral shape as described above. For this reason, the entire crawler 41 is shifted by the force F in the width direction acting on both ends. As shown in FIG. 8B, a Z torsion moment may occur.
As a result, it has been considered that uneven wear occurs between the wheel 44 and the guide projection 43.
[0008]
Therefore, the present invention has an object of eliminating the biased internal stress due to winding of a crawler in which a spiral cord is embedded, which is compatible with the above proposed high-speed traveling and is homogeneous and seamless.
[0009]
[Means for Solving the Problems]
Therefore, in the present invention, in the crawler in which the cord wound in a spiral shape with a predetermined pitch and tension is embedded , the reinforcing cord is wound in an endless spiral shape and embedded in substantially the entire width in the crawler . The code layers having the attaching directions opposite to each other are arranged adjacent to each other in the width direction.
Further, the present invention is characterized in that the cord layers in which the winding directions are opposite to each other are arranged adjacent to each other with the center in the width direction of the crawler as a boundary.
The present invention also relates to a pair of crawler cord winding methods in which a cord is wound around a crawler in a spiral shape with a predetermined pitch and tension, and a pair of cords each having a leading end locked on both ends of a crawler molding drum. The traverser is moved in the axial direction of the drum toward the other side as the drum rotates in one direction, and the cords are interlaced and wound in a spiral shape with a predetermined pitch and tension. .
The present invention is keep the code wrapping method crawler embedded wound spirally code in the crawler at a predetermined pitch and tension, lock the beginning of the code on one end of the drum for crawler molding each code bets Rabasa is moved toward the other axial end of the drum when going wound spirally at a predetermined pitch and tension, and locked so the code conversion point on the drum circumference drums the intended rotated in reverse, characterized in to Rukoto the winding direction reversed, it is an means for these issues resolved.
[0010]
Embodiment
Embodiments of the present invention will be described below with reference to the drawings.
1A and 1B show a first embodiment of a crawler and a cord winding method according to the present invention. FIG. 1A is a cross-sectional view of the crawler, and FIG. 1B is a plan cross-sectional view including a cord portion. FIG. 1C is a front view showing the cord winding method.
The crawler 1 according to the present invention is characterized in that in a crawler in which a cord wound spirally at a predetermined pitch and tension is embedded, cord layers whose winding directions are opposite to each other are arranged adjacent to each other in the width direction. In the embodiment shown in FIG. 1A, the cord layers having the winding directions opposite to each other are arranged adjacent to each other with the center in the width direction of the crawler as a boundary.
More specifically, as shown in FIG. 1 (A), elastic rubber or the like in which guide protrusions 3 such as rolling wheels are provided at predetermined intervals on the inner peripheral surface, and a grounding lug 4 is provided in an appropriate pattern on the grounding surface. The reinforcing cord 2 is wound and embedded in an endless spiral shape over substantially the entire width direction inside the crawler 1, and the width of the crawler 1 is more clearly shown in FIG. The cord layers are arranged adjacent to each other with the winding directions being opposite to each other at the center of the direction.
In the illustrated example, a Z-winding cord layer 2Z having a Z winding is formed on the left side, and an S winding cord layer 2S having an S winding is formed on the right side.
[0011]
In the present invention, two or more traversers, each of which is locked with a crawler molding drum with the leading end of each cord, are moved in opposite directions to each other in the axial direction of the drum as the drum rotates in one direction. The cord is wound in a spiral shape with a predetermined pitch and tension. In the first embodiment, as shown in FIG. 1C, the embedded cord 2 is wound as follows.
A pair of traversers 6Z, 6S, which are engaged with the start ends 7Z, 7S of the respective cords 2Z0, 2S0 at both ends of the crawler molding drum 5, are centered in the axial direction of the drum 5 as the drum 5 rotates in one direction. Each cord 2Z0, 2S0 is spirally wound with a predetermined pitch and tension to obtain each cord layer 2Z, 2S.
Here, each cord layer 2Z, 2S may be a rubberized cord coated with rubber G for each turn as shown in FIGS. 7B and 7C, or rubber on the front and back of the full-width cord row. A rubberized cord coated with G may be used.
Further, the material constituting the cord is not limited to the steel cord, and a non-metallic cord such as a nylon cord or a Kevlar (registered trademark) cord may be employed.
[0012]
Since the cord is wound inside the crawler 1 by such a winding method, the cord layer 2Z wound in the Z-winding spiral shape and the cord wound in the S-winding spiral shape at the center in the width direction. The torsional moments generated due to the winding tension between the layers 2S cancel each other, the biased internal stress is eliminated, and the left and right unbalanced crawlers are obtained. There is no occurrence of uneven wear.
In this way, it is homogeneous and seamless, there is no risk of abnormal rigidity and steel cord cutting, and it is not only more homogeneous on the circumference but also suitable for high-speed running with no bias in internal stress A crawler with an embedded spiral cord is provided.
[0013]
FIG. 2 shows a second embodiment of the crawler and the cord winding method of the present invention, FIG. 2 (A) is a cross-sectional view of the crawler, FIG. 2 (B) is a plan cross-sectional view including a cord portion, FIG. 2C is a front view showing the cord winding method.
What is shown in the second embodiment is that of the first embodiment in that the cord layers having the winding directions opposite to each other are arranged adjacent to each other with the center in the width direction of the crawler as a boundary. However, in this embodiment, a pair of traversers 6S, 6Z in which the start ends 7S, 7Z of the respective cords 2S0, 2Z0 are locked at the center of the crawler molding drum 5 are connected to the drum 5 In accordance with the rotation in one direction, the cords 2S0 and 2Z0 are moved outwardly in the axial direction of the drum 5 as indicated by arrows, and the cords 2S0 and 2Z0 are wound spirally at a predetermined pitch and tension.
By configuring in this way, in the present embodiment, various effects similar to those of the first embodiment can be obtained, and in combination with the cord winding method of the first embodiment, for example, It becomes possible to start the winding of the cord of the second embodiment from the winding end position of each traverser moved for winding the cord of the first embodiment, greatly reducing the manufacturing process time. can do.
[0014]
FIG. 3 is a cross-sectional view showing a crawler according to a third embodiment of the present invention. In the present embodiment, a number of code layers 2Z and 2S whose winding directions are opposite to each other are adjacent to each other in the width direction. It is arranged and configured.
Accordingly, although not shown in the drawing, the cord winding method is configured so that two or more traversers in which the start ends of the respective cords are locked at a plurality of corresponding positions of the crawler molding drum are rotated in one direction of the drum. Accordingly, the cords are moved in opposite directions to each other in the axial direction of the drum, and each cord is wound in a spiral shape with a predetermined pitch and tension.
With this configuration, the torsional moments generated due to the winding tension between the respective cord layers 2Z and 2S cancel each other, and the biased internal stress is eliminated as a whole, and the left and right sides without twisting are eliminated. Thus, a balanced crawler is obtained, and uneven wear does not occur between the wheel and the guide projection.
[0015]
FIG. 4 is a cross-sectional view showing a fourth embodiment of the crawler of the present invention. In the present embodiment, for example, an S-winding code layer 2S is arranged at the center in the width direction of the crawler 1, A Z-winding cord layer 2Z whose winding direction is reversed on both sides is arranged adjacently.
Therefore, in the present embodiment, although the internal stress remains slightly, the Z winding torsional moment due to the Z winding cord layer 2Z on both sides is reduced by the cord layer 2S disposed between them, and the internal biased as a whole is reduced. The stress is reduced, and a relatively balanced crawler is obtained on the left and right with less torsion, and the possibility of uneven wear between the roller and the guide projection is reduced.
[0016]
FIG. 5 is a front and side view showing a fifth embodiment of a crawler cord winding method according to the present invention.
In the present embodiment, a pair of traversers 6Z, 6S having the ends 2Z0, 2S0 of the respective cords 2Z0, 2S0 locked at both ends of the crawler molding drum 5 are rotated in one direction of the drum 5. Then, the cords 2Z0 and 2S0 are moved in the axial direction of the drum 5 in the direction of the arrows as shown by arrows, and wound in a spiral shape with a predetermined pitch and tension.
With this configuration, the torsional moment generated due to the winding tension between the Z-winding cord and the S-winding cord cancels each other for each winding of the cord, and the biased internal stress as a whole is reduced. The crawler that is balanced and balanced between left and right without twisting is obtained.
[0017]
FIG. 6 is a front and side view showing a sixth embodiment of the crawler cord winding method of the present invention.
In this embodiment, the traverser 6 with the start end 7 of the cord 2 locked to one end of the crawler molding drum 5 is moved toward the other end in the axial direction of the drum 5 so that each cord has a predetermined pitch and When winding in a spiral shape by tension, the cord 2 is locked to the conversion point 8 on the circumference of the drum 5 to rotate the drum 5 in the reverse direction, and the winding direction is reversed.
In the illustrated example, in the B section from the beginning of winding to the center in the width direction, the drum 5 is rotated in the B direction to obtain the S winding cord 2S0, and an appropriate engagement is performed at the conversion point 8 on the middle drum circumference. After the cord 2 is locked to the stop portion, the drum 5 is rotated in the reverse A direction, and the remaining A section is wound with Z winding to obtain the Z winding cord 2Z0. With this configuration, only one traverser 6 for winding is required, and cord layers having different winding directions can be combined relatively freely only by setting an appropriate number of conversion points and controlling the rotation of the drum 5. Can be arranged.
[0018]
The embodiment of the present invention has been described in detail above. However, within the scope of the present invention, the material and type of the crawler and the shape including the grounding lug and the wheel guide lug, the drive wheel and the arrangement of the wheel, the crawler The drive type, cord material, twist type, rubberized form, structure such as pitch, winding tension, Z, S wound cord arrangement, drum type, traverser type, etc. can be employed as appropriate.
[0019]
【The invention's effect】
As described above in detail, according to the present invention, in the crawler in which the cord wound in a spiral shape with a predetermined pitch and tension is embedded , the reinforcing cord has an endless spiral over almost the entire width in the crawler. Since the cord layers wound and embedded in the shape and arranged in the width direction adjacent to each other are arranged adjacent to each other in the width direction, the Z-winding cord layer and the S-winding cord embedded in the crawler by being wound spirally The layers cause the torsional moments caused by the winding tension between them to cancel each other, eliminating the biased internal stress and obtaining a crawler that is balanced between left and right, so that the crawler is twisted. Thus, uneven wear does not occur between the wheel and the guide projection, and the life of the crawler itself is improved.
Therefore, if the crawler is integrally molded by the endless ring-shaped vulcanization mold previously proposed by the applicant of the present application and applied to a crawler that is homogeneous and seamless, and does not cause any abnormality in rigidity or cord cutting, There is provided a crawler embedded with an excellent spiral cord suitable for higher speed running, which is not only more homogeneous in material but also has no bias in internal stress.
[Brief description of the drawings]
FIG. 1 shows a first embodiment of a crawler and a cord winding method thereof according to the present invention, FIG. 1 (A) is a cross-sectional view of the crawler, FIG. 1 (B) is a cross-sectional plan view including a cord portion, FIG. 1C is a front view showing the cord winding method.
2A and 2B show a second embodiment of the crawler and the cord winding method of the present invention, FIG. 2A is a cross-sectional view of the crawler, FIG. 2B is a plan cross-sectional view including a cord portion, FIG. 2C is a front view showing the cord winding method.
FIG. 3 is a cross-sectional view illustrating a crawler according to a third embodiment of the present invention.
FIG. 4 is a cross-sectional view illustrating a crawler according to a fourth embodiment of the present invention.
FIG. 5 is a front view and a side view showing a fifth embodiment of a crawler cord winding method according to the present invention.
FIGS. 6A and 6B are a front view and a side view showing a sixth embodiment of a crawler cord winding method according to the invention. FIGS.
FIG. 7 is a side view of a crawler cord winding method, which is a prerequisite technology of the present case, and a cross-sectional view of an example of a code string.
FIG. 8 is an explanatory view of twisting of a crawler in which a spiral cord is embedded.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Crawler 2 Spiral cord 2S0 S winding cord 2S S winding cord layer 2Z0 Z winding cord 2Z Z winding cord layer 3 Guide protrusion 4 Ground lug 5 Drum 6 Traverser 6S S winding traverser 6Z Z winding traverser 7 Start end portion 7S S winding start end portion 7Z Z winding start 8 conversion point

Claims (4)

In a crawler in which a cord wound spirally at a predetermined pitch and tension is embedded , a reinforcing cord is wound and embedded in an endless spiral over almost the entire width in the crawler, and the winding directions are reversed. A crawler wherein the code layers are arranged adjacent to each other in the width direction.   The crawler according to claim 1, wherein the cord layers having the winding directions opposite to each other are arranged adjacent to each other with a center in the width direction of the crawler as a boundary. In a crawler cord winding method in which a cord is wound around and embedded in a crawler in a spiral shape with a predetermined pitch and tension, a pair of traversers, each of which is engaged with a crawler molding drum at both ends of the cord, A method of winding a crawler cord, wherein the cords are moved in the axial direction of the drum toward the other side in accordance with the rotation of the drum in such a manner that the cords are interlaced and wound in a spiral shape with a predetermined pitch and tension. The code crawler keep cord winding method crawler embedded wound spirally at a predetermined pitch and tension, de bets Rabasa which locks the starting end of the code to one end of the drum for crawler molding When moving the cord toward the other end in the axial direction of the ram and winding each cord in a spiral at a predetermined pitch and tension , the cord is locked at a conversion point on the drum circumference and the drum is rotated in the reverse direction. code winding method of the crawler, wherein to Rukoto the winding direction reversed.

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