JP6076585B2 - Rubber crawler, rubber crawler assembly, and rubber crawler manufacturing method - Google Patents

Description

  The present invention relates to a rubber crawler, a rubber crawler assembly, and a rubber crawler manufacturing method including a metal core having a pair of protrusions protruding toward the inner peripheral surface of a rubber crawler.

From the viewpoints of road surface protection, noise suppression, and environmental protection, rubber crawlers have recently been used in the running parts of vehicles such as construction machinery and agricultural machinery, and the driving force is transmitted to the rubber crawlers by sprockets. It has become.
As such a rubber crawler, one in which drive protrusions (hereinafter referred to as crawler protrusions) are formed on a rubber crawler inner peripheral surface at a constant pitch is widely known (see, for example, Patent Document 1). This crawler protrusion is a protrusion-like object that is raised in a mountain shape on the inner peripheral surface of the rubber crawler, and the crawler protrusion is driven by a toothed portion of a sprocket attached to the drive shaft. Transmit power.

JP 2009-78796 A

As this crawler projection, a projection is formed on a metal core embedded in the rubber crawler, and a rubber layer is formed on the surface of the projection in many cases. A rubber crawler is manufactured by placing the cored bar in a vulcanizing mold and vulcanizing and molding raw rubber by pressing or the like.
By the way, when arrange | positioning a metal core to the metal mold | die for vulcanization | cure, the protrusion part of a metal core is arrange | positioned facing down. For example, in Patent Document 1, one side of the metal core in the short direction of the core metal is supported at two places and the other side at two places, for a total of four places, and is supported in the vulcanizing mold. Here, it is more preferable that the core metal can be held more stably in the vulcanization mold.
In the present invention, in consideration of the above fact, when the rubber is bonded to the core metal while vulcanizing, the movement of the core metal in the longitudinal direction and the short direction of the core metal is regulated to improve the position accuracy of the core metal. It is an object to provide a rubber crawler, a rubber crawler assembly, and a rubber crawler manufacturing method.

The invention according to claim 1 is provided with a plurality of core bars provided at a predetermined interval in the circumferential direction of the rubber crawler and having a longitudinal direction along the rubber crawler width direction, and the core bar protrudes toward the inner peripheral surface side of the rubber crawler. A pair of protrusions that engage with the sprocket, and the protrusions are formed downward, and the cored bar is disposed at a predetermined position of a rubber crawler vulcanization mold with the protrusions downward. The movement in the short direction of the cored bar is controlled by contacting the mold, and the part that is in contact with the mold is exposed at the regulated part that is exposed without being covered with rubber, and the tip part of the protruding part, In a state where the cored bar is disposed at a predetermined position of the rubber crawler vulcanization mold with the protruding part downward, the cored bar is supported by contacting the mold and moved in the longitudinal direction of the cored bar. A supported portion to be regulated, and the supported portion is exposed without being covered with rubber. It said tip except for the supported portion so that is covered with rubber.
In the first aspect of the present invention, the metal bar in which the restriction portion is formed between the protrusions and the supported portion is formed at the tip of the protrusion is used.
Then, when the rubber crawler is vulcanized, the cored bar is directed downward, the mold is closed, and the cored bar is placed at a predetermined position of the mold, that is, a set position during vulcanization molding.
After closing the mold, the rubber crawler is manufactured by vulcanization molding at a predetermined temperature for a predetermined time.
As described above, in the invention described in claim 1, since the rubber crawler is vulcanized and molded by restricting the movement in both the longitudinal direction of the core metal and the short direction of the core metal, the position accuracy of the core metal is improved. A rubber crawler is realized.
The restricting portion may be controlled by point contact or surface contact with the side wall of the cored bar portion between the protruding portions, or a recess into which the regulating portion enters is formed in the cored bar portion between the protruding portions. It may be.

The invention according to claim 2 includes the rubber crawler according to claim 1 and a sprocket that engages with an engaging portion formed on an inner peripheral side of the rubber crawler.
Thereby, it can be set as the rubber crawler assembly which has the rubber crawler which made the position accuracy of a metal core favorable.

The invention according to claim 3 uses the core metal according to claim 1, restricts the movement in the short direction of the core metal at the restricted portion, and supports the supported portion in the longitudinal direction of the core metal. The rubber crawler according to claim 1 is manufactured by regulating the movement and performing vulcanization molding with the mold.
In the third aspect of the present invention, a cored bar is used in which the restricting part is formed on the cored bar part between the projecting parts and the supported part is formed on the tip part of the projected part.
Then, when the rubber crawler is vulcanized, the core metal protrusion is directed downward, the metal mold is closed, and the metal core is placed at a predetermined position of the metal mold. At that time, the raw rubber portion forming the rubber on the inner peripheral side of the rubber crawler is placed in the mold, and the core metal with the protruding portion facing downward is placed on the raw rubber portion, and further, the outer peripheral side of the crawler is formed. By placing the raw rubber part and closing the mold, the cored bar is pressed through the raw rubber part on the outer periphery side of the crawler of the cored bar, the regulated part is regulated by the regulating part, and the supported part is the core of the mold. The configuration may be such that the gold support portion is in contact with the gold support portion and disposed at this set position.
After closing the mold, the rubber crawler is manufactured by vulcanization molding at a predetermined temperature for a predetermined time.

  Therefore, it is possible to manufacture a rubber crawler with good position accuracy of the core bar by restricting movement in both the longitudinal direction of the core bar and the short direction of the core bar.

  ADVANTAGE OF THE INVENTION According to this invention, when making rubber | gum adhere to a metal core, the rubber crawler which controlled the movement to a metal core longitudinal direction and a metal core short direction, and made the position accuracy of a metal core favorable, and a rubber crawler It can be set as an assembly and a rubber crawler manufacturing method.

It is a fragmentary perspective view of the rubber crawler assembly concerning one embodiment of the present invention. It is the rubber crawler concerning one embodiment of the present invention, and is a fragmentary sectional view of the rubber crawler circumference direction seen from between a pair of projection parts. It is sectional drawing of arrow 3-3 of FIG. It is a rubber crawler concerning one embodiment of the present invention, and is a partial perspective view of a rubber crawler which shows a regulated part of a core metal. It is a perspective view of the metal core which comprises the rubber crawler which concerns on one Embodiment of this invention. FIG. 6 is a cross-sectional view taken along arrow 6-6 in FIG. 1. It is a perspective view of the control part of the mold for vulcanization | cure used by one Embodiment of this invention. It is a perspective view which shows mounting a metal core on the raw rubber mounted in the metal mold | die for vulcanization | cure in one Embodiment of this invention. FIG. 5 is a perspective view for explaining vulcanization molding by supporting a cored bar from below with a vulcanization mold in an embodiment of the present invention. FIG. 6 is a perspective view for explaining that vulcanization molding is performed by supporting a cored bar from below with a vulcanization mold in a modification of one embodiment of the present invention. FIG. 6 is a perspective view for explaining that vulcanization molding is performed by supporting a cored bar from below with a vulcanization mold in a modification of one embodiment of the present invention.

Hereinafter, embodiments will be described and embodiments of the present invention will be described.
(overall structure)
As shown in FIG. 1, a rubber crawler assembly 200 according to an embodiment of the present invention is provided with a sprocket 100 and a rubber crawler 10 to which a rotational driving force is transmitted by the sprocket 100. For convenience of explanation, the rotation direction of the rubber crawler 10 is referred to as the circumferential direction CD of the rubber crawler 10, and the direction perpendicular thereto is referred to as the width direction RD of the rubber crawler 10.

  This rubber crawler 10 is a so-called inner peripheral drive type rubber crawler, and has a lug 12 acting on the road surface on the outer peripheral surface side. As shown in FIGS. 1 to 3, an engagement portion 17 is formed on the inner peripheral surface side of the crawler to transmit a driving force to the rubber crawler itself when the sprocket 100 is rotated forward or reverse. The engaging portions 17 are arranged between the pair of protrusions 16 formed on the plurality of metal cores 15 embedded in the circumferential direction CD of the rubber crawler 10 with a predetermined pitch, and between the cores 15. It is comprised including the dent part 13.

A plurality of core bars 15 are embedded at predetermined intervals in the circumferential direction CD so that the longitudinal direction of the core bars 15 is along the width direction RD of the rubber crawler 10. Detailed structure of the metal core 15 will be described later in detail, but the inner peripheral surface of the central portion as shown, said pair of projections to the core metal longitudinal Direction same position (rubber crawler width direction same position) 16 is formed. A fist-like corner 18 is formed on the protrusion 16 as the tip of the protrusion 16.
As described above, the pair of protrusions 16 formed in a bifurcated shape protrude from the inner peripheral surface of the rubber crawler 10 toward the inner side (rubber crawler inner peripheral side), and this is covered with a rubber material in the same manner as the rubber crawler 10. Thus, a pair of crawler protrusions 19 is formed.

And the layer arrange | positioned on the outer side of the metal core 15 is a reinforcement layer extended in the endless direction (endless belt shape) to the circumferential direction CD so that each metal core 15 may be included including the steel cord (not shown). is there.
The steel cord is a tensile member embedded in the rubber crawler 10 so that the rubber crawler 10 rotates smoothly based on the driving force received from the sprocket 100 while restricting the expansion of the rubber crawler 10 in the circumferential direction CD. Assist.

  The sprocket 100 includes a circular base portion 102 having a circular outer periphery, and a plurality of tooth portions 101 disposed on the peripheral edge portion of the circular base portion 102. The plurality of tooth portions 101 protrude to both sides in the thickness direction of the circular base portion 102, and come into contact with the side wall 17 </ b> S on the crawler circumferential direction CD side of the crawler protrusion portion 19 as the circular base portion 102 rotates. It has become.

  In this way, in the rubber crawler 10, as shown in FIG. 2, the cored bar 15 is arranged at an equal pitch in the circumferential direction CD, and the recess 13 receives the tooth portion 101 of the sprocket 100 between each of them. Thus, these are also arranged at equal pitches in the circumferential direction CD. The dent 13 is formed so that a standard crawler inner peripheral surface of the rubber crawler 10 is recessed.

  In this structure, the driving force transmitted from the sprocket 100 to the rubber crawler 10 is transmitted when the tooth portion 101 of the sprocket 100 enters the recess 13 and engages (contacts) the wall surface of the recess 13. . That is, by repeating the operation in which the tooth portions 101 of the rotating sprocket 100 sequentially enter the respective recessed portions 13 arranged at a constant pitch on the inner peripheral surface of the rubber crawler 10, the wall surfaces of the recessed portions 13 are sequentially pressed. The rubber crawler 10 is rotated.

  When the dent 13 is a through-hole, a structure with improved discharge of mud, gravel and the like can be obtained. Moreover, the contact area with the tooth part 101 can be appropriately adjusted by changing the wall surface shape of the recessed part 13. If the wall surface of the recessed portion 13 is designed so as to increase the contact area, the surface pressure with the tooth portion 101 can be reduced.

  In the structure of FIG. 2 described here, the recessed portions 13 are disposed between the cored bars 15 embedded at a constant pitch as described above. In other words, in this structure, since the cored bar 15 is positioned before and after the recessed portion 13 in the circumferential direction CD, the recessed portion 13 is positioned before and after. And it becomes a strong structure in which the back part of the dent part 13 is supported by the hard metal core 15. Therefore, the tooth portion 101 of the sprocket 100 can be indirectly engaged with the cored bar 15 under the deformation of the recessed portion 13 to reliably transmit the driving force.

  In addition, when the concave portion 13 that is recessed from the standard inner surface of the crawler to the outer peripheral surface is provided as described above, the engagement position (drive transmission point) with which the tooth portion 101 of the sprocket 100 is engaged is lowered, and the steel is lowered. Since the distance from the cord (not shown) to the engagement position is shortened, a rubber crawler with good driving force transmission efficiency can be obtained.

  A wheel (not shown) is a load support wheel that is provided to guide and stably drive the rubber crawler 10 while supporting a load, and a sprocket 100 serving as a drive wheel and an idler serving as a driven wheel (see FIG. (Not shown) as needed.

  Further, in the rubber crawler assembly 200 including the rubber crawler 10 and the sprocket 100 that engages with the engaging portion 17 formed on the inner peripheral side of the rubber crawler 10, the teeth 101 of the sprocket 100 are formed on the circular base 102. It protrudes on both sides in the thickness direction, and this tooth portion 101 engages with the recessed portion of the rubber crawler 10. Accordingly, the contact area between the tooth portion 101 and the wall surface of the recess portion 13 can be increased, so that the surface pressure at the time of contact can be reduced, and the rubber of the rubber crawler 10 is hardly damaged. Moreover, since the thickness of the circular base 102 can be reduced, the weight of the sprocket 100 can be reduced.

The rubber crawler 10 of the above-described embodiment is formed to include other structures that are preferably provided in addition to the above-described configuration. Hereinafter, this point will be described.
Referring to FIGS. 2 to 6 again, a raised surface 20 formed by raising a rubber material is formed on the front and back of the cored bar 15 in the circumferential direction CD. When the inner peripheral surface between the left and right crawler protrusions 19 is lowered, the contact area with the sprocket 100 is reduced and the surface pressure is increased. Therefore, a raised surface 20 may be provided on the front and back of the central portion of the cored bar 15 so that the rubber is raised and raised from the other inner peripheral surface of the standard crawler.

  By providing the raised surface 20 between the pair of left and right corner portions 18 in this way, the contact area between the recessed portion between the tooth portions 101 of the sprocket 100 and the inner peripheral surface of the rubber crawler 10 can be increased. it can. Thereby, the surface pressure acted on by the tooth part 101 can be reduced. In addition, you may make it the structure which does not contact the recessed part between tooth | gear parts 101 and the internal peripheral surface of the rubber crawler 10. FIG.

  By providing the raised surfaces 20 before and after the core bar 15 in this way, contact between the central portion of the core bar 15 and an idler (not shown) can be reliably prevented. If the rubber film at the center of the core 15 becomes thin due to the use of a rubber crawler for a long time, noise may occur due to unintended contact with the idler. By forming the raised surface 20 which is the surface of the raised part with a thick rubber thickness before and after the cored bar 15, noise generation can also be prevented.

(Core metal)
FIG. 4 is a perspective view showing the regulated portion formed on the cored bar. FIG. 5 is a perspective view of the cored bar 15. 6 is a cross-sectional view taken along the line 6-6 in FIG. FIG. 7 is a perspective view showing a restricting portion formed in the mold. FIG. 8 is a perspective view showing that the core metal 15 is placed on the raw rubber placed on the vulcanizing mold. FIG. 9 is a perspective view for explaining that the protruding portion 16 of the metal core 15 is supported from below. The structure of the cored bar 15 will be described in more detail with reference to these drawings.

The base portion of the core metal 15 is generally rectangular in plan view, and is embedded in the rubber crawler 10 with its longitudinal direction extending in the width direction RD (see FIG. 1). The pair of protrusions 16 described above are formed in a central portion of the core metal 15 in a state of being separated from each other.
The corner portion 18 of the projection 16 has a shape that is longer in the circumferential direction, with a dimension in the circumferential direction CD (core metal short direction) larger than a dimension in the width direction RD (core metal longitudinal direction). The sprocket 100 and the above-described rolling wheel can be smoothly guided between the pair of corner portions 18.

  The interval between the pair of corner portions 18 is set so as to ensure an interval at which the sprocket 100 can smoothly rotate. However, since the metal core 15 is covered with the same rubber material as that of the rubber crawler except for a concave portion 22 which will be described later, the protrusion 16 is a rubber-like crawler protrusion 19 in appearance. Therefore, the sprocket 100 rotates while being guided between the two crawler protrusions 19. Accordingly, the distance between the pair of corner portions 18 is set to be large in consideration of the thickness of the rubber to be coated.

(Regulated part)
The rubber crawler vulcanization molding die 30 is formed with a restricting portion 34 (see FIG. 7 for both), and as shown in FIG. A regulated portion 26 is formed in which the movement of the gold itself in the short direction of the core (that is, the circumferential direction CD of the rubber crawler 10) is regulated by the regulating portion 34. In the present embodiment, the regulated portion 26 is formed by a part of the side wall 26P and a part of the side wall 26Q of the cored bar central portion 15M constituting the pair of protrusions 16.

  As shown in FIG. 7, the restricting portion 34 formed on the mold 30 includes a one-side restricting portion 34 </ b> A that restricts the movement in the short direction of the cored bar 15 at a position near the one projecting portion 16, and the other projecting portion. And the other side restricting portion 34 </ b> B that restricts the movement of the core bar 15 in the short direction at a position close to 16.

  The one-side restricting portion 34A has a first pin 36P that abuts on one side wall 26P of the core metal central portion 15M during vulcanization molding, and a first pin 36P that abuts on the other side wall 26Q of the core metal central portion 15M during vulcanization molding. 2 pins 36Q and the bases of the first pin 36P and the second pin 36Q are continuous to the projecting portion extending side surface 15S (see FIGS. 4 and 5) of the cored bar central portion 15M during vulcanization molding. And a base 38. The other side restricting portion 34B has the same configuration. Note that the base portion 38 is not necessarily in contact with the surface 15S, and may be non-contact.

  In the present embodiment, when the core metal central portion 15M is inserted between the first pin 36P and the second pin 36Q, the first pin 36P contacts the side wall 26P and the second pin 36Q contacts the side wall 26Q. In contact therewith, movement of the core 15 in the short direction (that is, the circumferential direction CD of the rubber crawler 10) is restricted from both sides. Accordingly, the interval between the side walls 26P and 26Q is set in accordance with the interval between the first pin 36P and the second pin 36Q.

(Corner recess)
As shown in FIGS. 5 and 6, the inner side 18 </ b> G in the core metal longitudinal direction of the pair of corner portions 18 is a smooth surface. Here, the smooth surface means not only a flat surface but also a curved surface having no unevenness, and is a surface on which no step is formed.
On the outer side 18 </ b> E of the pair of corners 18 in the longitudinal direction of the cored bar, a recessed part 22 with which a cored bar support part 32 (see FIG. 9) of a rubber crawler vulcanization mold abuts from below is used as a supported part. It is formed (see FIGS. 5, 6, and 9).

  The concave portion 22 has the highest height in the short metal core direction center portion 22C, and the bottom surface 22B of the concave portion 22 extends from the short metal core direction central portion 22C to both sides of the short metal core direction toward the proximal end side of the protrusion. Inclined towards. That is, the concave portion 22 has a shape in which the both side portions 18S in the short side direction of the core bar 18E of the corner portion 18 in the longitudinal direction of the core bar are recessed. Therefore, as shown in FIG. 9, in order to perform vulcanization molding, the core 18 is placed at a predetermined position of the rubber crawler vulcanization mold 30, that is, at the time of vulcanization molding, with the corner portion 18 of the projection 16 facing downward. The bottom surface 22B of the recess 22 is the bottom (deepest) at the central portion 22C in the short metal core direction, and the bottom surface 22B extends from the central metal core short direction 22C to both sides in the short metal core direction. It is inclined to rise gradually.

(Manufacturing method of rubber crawler)
In the present embodiment, when the core metal 15 is manufactured by casting or the like, the above-described restricted portions (side walls 26P, 26Q) and the concave portion 22 are formed in advance in the core metal central portion 15M.
In order to vulcanize and form the rubber crawler 10, a die 30 having the above-described restricting portion 34 that comes into contact with the restricted portion 26 and a core metal support portion 32 that contacts the concave portion 22 and supports the core metal 15 (see FIG. 7, see FIG.

  Specifically, as shown in FIG. 7, the restricting portion 34 includes the above-described base portion 38 that extends upward from the lower die 31 that constitutes the die 30, and the upper portion from both ends of the base portion 38 in the core metal short direction. The first pin 36P and the second pin 36Q extend to the left. Of the base portion 38, the upper surface portion 38S between the first pin 36P and the second pin 36Q is in contact (non-contact) with the surface 15S on the projecting portion extension side of the core metal central portion 15M by substantially surface contact. (It is possible).

  As shown in FIG. 9, the core metal support portion 32 protrudes in a Y-shape so as to protrude from the inner wall of the mold so that the concave portion 22 of the held core metal 15 can be supported from below. Then, when the core 15 is placed (set) on the mold 30 with the projection 16 facing downward, the core support 15 is brought into contact with the recess 22 from below, and the core 15 is supported. Inevitably, positioning of the core 15 in the vertical direction and positioning of the corner 18 in the short direction of the core are performed. Further, since the displacement of the cored bar 15 in the longitudinal direction of the cored bar is also restrained by the inner wall of the mold over which the cored bar support 32 projects, positioning in the longitudinal direction of the cored bar is also performed.

In the present embodiment, as shown in FIG. 8, the raw rubber portion N that forms the inner peripheral side of the rubber crawler is placed in the lower mold constituting the mold 30, and the protrusion 16 is formed on the raw rubber portion. The wing portion 15Y of the cored bar 15 is placed with the facing downward. And the raw rubber part which forms a rubber crawler outer peripheral side is mounted on it, and the metal mold | die 30 is closed. As a result, the cored bar 15 is pressed through the raw rubber portion that forms the outer peripheral side of the rubber crawler, and the side wall 26P has two first pins 36P (the first pins of the one side regulating portion 34A and the other side regulating portion 34B). 36P) and the side wall 26Q is in contact with the two second pins 36Q (the second pins 36Q of the one-side restricting portion 34A and the other-side restricting portion 34B) to move the core 15 in the short direction of the core. In addition, the upper surface portion 38S of the restricting portion 34 abuts on the surface 15S of the core metal central portion 15M and the recess 22 abuts on the core metal support portion 32.
After closing the mold, the rubber crawler 10 is manufactured by vulcanization molding at a predetermined temperature for a predetermined time.

When manufactured in this manner, the metal core 15 is restricted from moving in the short metal direction by the restricting portion 34, and is also restricted from moving in the long metal core direction by the recess 22. Accordingly, it is possible to manufacture the rubber crawler 10 in which the position accuracy of the core bar 15 is improved.
Further, the rubber is not covered by the restricting portion 34 is a portion where a total of four pins of the two first pins 36P and the two second pins 36Q are in contact with each other. Therefore, even if the restriction portion 34 restricts the movement in the longitudinal direction of the core metal, the amount of rubber adhering to the core metal central portion 15M is hardly reduced.

  Moreover, the recessed part 22 which the metal core support part 32 contact | abutted is exposed. And this recessed part 22 is formed in the core metal longitudinal direction outer side 18E, and is not formed in the core metal longitudinal direction inner side 18G.

  Further, at the time of vulcanization molding, the cored bar central portion 15M is supported by being in contact with the surface 38S on the protruding portion extension side of the base portion 38. Accordingly, since the supporting force applied to the core metal support part 32 is significantly lower than the case where the core metal 15 is supported only by the core metal support part 32 in which the concave part 22 is formed, the size of the concave part 22 can be reduced. . As a result, the amount of rubber formed on the surface of the corner 18 can be greatly increased, and the area of the cored bar exposed at the corner 18 can be greatly reduced.

  Moreover, the recessed part 22 is made into the shape where the core metal transversal direction both-sides part 18S of the core metal longitudinal direction outer side 18E of the corner | angular part 18 was dented. Thereby, the core metal support portion 32 is brought into contact with the concave portion 22 from the lower side to support the core metal 15, whereby the position of the corner portion 18 in the short direction of the core metal is easily positioned.

  In the present embodiment, as shown in FIG. 9, in the concave portion 22 formed in the corner portion 18 of the projection portion 16, when the corner portion 18 of the projection portion 16 is directed downward, the central portion in the core metal short direction. Although 22C demonstrated in the shape used as the bottom, this invention is not restricted to this, What is necessary is just the shape which can support the metal core 15 from the downward side by the corner | angular part 18 at the time of vulcanization molding.

  For example, instead of the recess 22, a recess 42 as shown in FIG. 10 may be formed on the outer side in the core metal longitudinal direction. The concave portion 42 becomes a concave portion 42P having the highest height position in the central portion in the short direction of the core metal when the corner portion 48 of the protrusion 46 of the core metal 45 is directed downward. The bottom surface of the recess 42 is inclined toward the tip end side of the protrusion 46 toward both sides of the metal core in the short direction. Accordingly, the concave portion 42 has an upwardly convex triangular shape as viewed from the outside in the longitudinal direction of the cored bar. In this case, the cored bar support part 52 that contacts the bottom surface of the concave part 42 and supports the protrusion 46 is formed in a mold for rubber crawler vulcanization molding instead of the cored bar support part 32 (see FIG. 9). . The upper end portion of the core metal support portion 52 has a triangular shape that is convex upward when viewed from the outside in the longitudinal direction of the core metal.

  Further, in place of the concave portion 22, as shown in FIG. 11, even if the concave portion 72 is formed on the inner side in the core metal longitudinal direction of the corner portion 68 of the projection portion 66, the core metal 65 of the core metal 65 is short when vulcanized. Since the movement in the hand direction and the movement in the longitudinal direction of the metal core are restricted, a rubber crawler with high positional accuracy of the metal core 65 can be manufactured.

  The embodiments of the present invention have been described with reference to the embodiments. However, the above embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. Needless to say, the scope of rights of the present invention is not limited to the above embodiment.

DESCRIPTION OF SYMBOLS 10 Rubber crawler 13 Recessed part 15 Core metal 16 Protrusion part 17 Engagement part 18 Corner | angular part (tip part)
18G Core metal longitudinal direction inner side 18E Core metal longitudinal direction outer side 22 Recessed part (supported part)
26 Restricted portion 30 Mold 34A, B Restricted portion 42 Recessed portion (supported portion)
45 Core 46 Projection 48 Corner (tip)
65 Core Bar 66 Protrusion 68 Corner 72 Concave 100 Sprocket 101 Teeth 102 Circular Base 200 Rubber Crawler Assembly

Claims (3)

A plurality of core bars provided at predetermined intervals in the circumferential direction of the rubber crawler and having a longitudinal direction along the width direction of the rubber crawler,
The cored bar protrudes toward the inner peripheral surface of the rubber crawler and engages with a sprocket; and
Formed between the projections, the said projections and downward core metal in a state arranged at a predetermined position of a mold for a rubber crawler vulcanizing metal core widthwise direction in contact with the mold The portion of the mold that is in contact with the mold is exposed without being covered with rubber ;
The cored bar is formed at the tip of the protruding part, and is in contact with the mold in a state where the cored bar is disposed at a predetermined position of the mold for rubber crawler vulcanization molding with the protruding part downward. Is supported and the movement of the metal core in the longitudinal direction is restricted,
Have
A rubber crawler in which the tip portion excluding the supported portion is covered with rubber so that the supported portion is exposed without being covered with rubber. A rubber crawler according to claim 1;
A sprocket that engages with an engaging portion formed on the inner peripheral side of the rubber crawler;
A rubber crawler assembly comprising: Using the metal core according to claim 1,
By restricting the movement in the short direction of the cored bar by the regulated part and regulating the movement in the longitudinal direction of the cored bar while supporting the supported part, vulcanization molding is performed by the mold. The rubber crawler manufacturing method which manufactures the rubber crawler of description.

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