JP5348965B2 - Rubber crawler manufacturing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a high tension cord from a corrugation generated during vulcanization of rubber for a joint, in a rubber crawler formed by connecting both ends of a long belt-like rubber body having the ends in which the high tension cord is embedded so that an end side of the high tension cord is extended from both ends in a longitudinal direction, by the rubber for the joint within a molding mold for the joint. <P>SOLUTION: A back clearance 18 of 0.5-2 mm is formed, in a portion for housing both end portions 6b in a longitudinal direction of a long belt-like rubber body 6 in a cavity 8C of the molding mold 8 for the joint, by pressure F of the rubber during vulcanizing a rubber 7 for the joint, so as to move both end portions 6b in the longitudinal direction of the long belt-like rubber body 6 to a direction X of a crawler circumference to be separated from a portion for vulcanizing rubber 7 for the joint. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a rubber crawler manufacturing apparatus employed in a crawler type traveling device used as a traveling unit of a construction / civil engineering work machine or an agricultural work machine.

In general, a crawler type traveling device hits a rubber crawler formed in an endless belt shape over a sprocket, an idler, and a plurality of wheels to drive the sprocket to rotate and transmit a driving force from the sprocket to the rubber crawler 1. By doing so, the rubber crawler is configured to run while circulating in the circumferential direction (longitudinal direction).
As shown in FIG. 5, as the rubber crawler 1, lugs 3 are provided at a constant pitch P in the crawler circumferential direction X on the outer peripheral side of the crawler main body 2 formed in an endless belt shape by rubber, and on the inner peripheral side of the crawler main body 2. An engaging portion 4 having a function of receiving a driving force from the sprocket and a function of preventing the rubber crawler 1 from being removed is provided at a constant pitch P (crawler pitch) in the crawler circumferential direction X, and transmitted to the engaging portion 4. There is a structure in which a tensile body 5 having a function of transmitting the driving force over the entire circumference of the crawler body 2 and a function of withstanding the tension in the circumferential direction X applied to the rubber crawler 1 is embedded in the crawler body 2.

The illustrated example illustrates a rubber crawler 1 of a coreless type, and the lugs 3 and the engaging portions 4 are arranged at the same pitch P and are at the same position in the crawler circumferential direction X. Is provided as an example.
As the tensile body 5, there is one in which end-end tensile cords 5 a embedded in the crawler body direction 2 along the crawler circumferential direction X are arranged in parallel in the crawler width direction as embedded in the crawler circumferential direction X. In this type of tensile body 5, each tensile cord 5a is formed longer than the entire length in the circumferential direction X of the crawler body 2, and one end side b and the other end side of the end tensile cord 5a. The tensile strength cord 5a is joined in an endless manner by overlapping (overlapping) c with the crawler thickness direction Y.

The following method is known as a method of manufacturing the rubber crawler 1 having the tensile body 5 joined endlessly by overlapping the end portions b and c of the end tensile strength cord 5a. Yes.
First, as shown in FIG. 6 (a), the tensile cord 5a is embedded along the longitudinal direction so that it is end-banded and the end portions b and c of the tensile cord 5a extend from both longitudinal ends thereof. A long band-like rubber body 6 having lugs and engaging portions is formed on the crawler main body portion 6a by a molding die (that is, most of the rubber crawler 1 is first formed into an end-band shape).

Note that both ends in the longitudinal direction of the crawler main body portion 6a of the long belt-like rubber body 6 are left in an unvulcanized or semi-vulcanized state in order to connect them by vulcanization.
Next, the long band-like rubber body 6 is bent into a loop shape, and as shown in FIG. 6B, both ends in the longitudinal direction of the crawler main body portion 6a of the long band-like rubber body 6 face each other with a gap therebetween. The end side b, c of the tensile cord 5a is overlapped between both ends of the long band-shaped rubber body 6 and bonded together, and further, between the longitudinal ends of the crawler main body portion 6a of the long band-shaped rubber body 6. An unvulcanized or semi-cured rubber 7 for the joint is arranged, and the rubber 7 for the joint is vulcanized in the molding die 8 for the joint. As a result, the endless belt-like rubber crawler 1 shown in FIG. 5 is formed.

The joint rubber body 9 includes a lug 3 and an engaging portion 4 in a short crawler main body portion 9a in which the overlapping portion 10 of the tensile strength cord 5a is embedded.
As shown in FIGS. 6B and 7, the joint mold 8 is composed of an upper mold 8A and a lower mold 8B, and the cavity 8C is an end portion side portion 6b ( A long vulcanized portion 11 for accommodating (inserting) the end side portion of the crawler main body portion 6a and the lug 3 and the engaging portion 4) provided on the end side portion, and the joint rubber body 9 are added. And a joint vulcanizing section 12 for performing vulcanization molding.

Further, in FIG. 7, the cavity 8 </ b> C of the joint mold 8 is a portion 13 (crawler body forming portion) that forms the crawler body 2 at the center in the vertical direction, and the lug 3 is formed above the crawler body forming portion 13. The lower portion 14 is a portion 15 (engagement portion forming portion) that forms the engaging portion 4.
Further, the lug forming portions 14 of the cavities 8C of the joint mold 8 are all formed in the same shape, and the engaging portion forming portions 15 are also formed in the same shape, and the lug forming portion 14 and the engaging portion forming portion 15 are formed. The pitch A (crawler pitch) is the same.
JP 2005-280337 A

In the manufacturing method of the rubber crawler 1 described above, when the ends of the long belt-like rubber body 6 are joined, the work of bonding the end portions b and c of the tensile cord 5a so as to overlap each other is performed by a human hand. However, if the bonding operation is performed manually, the bonding portion (overlapping portion 10) between the end portions b and c of the tensile strength cord 5a is inevitably loosened.
When this looseness occurs, when the joint rubber 7 is vulcanized in the joint mold 8, as shown in FIG. 8, a wave 16 is generated in the vicinity of the overlapping portion of the tensile strength cords.

When undulation occurs in the tensile cord 5a, when the rubber crawler 1 is driven by being sprinkled on a sprocket, idler, or wheel, stress concentrates on the undulation 16 portion, and the portion breaks earlier than other portions. However, there is a problem that the durability of the rubber crawler 1 is lowered.
Further, when the rubber crawler 1 is sprinkled over the sprocket, idler, and wheel and tension is applied to the rubber crawler 1, the engaging portion 4 to which the driving force is transmitted from the sprocket is generated at the portion where the wave 16 is generated. When the pitch P is extended and the pitch P of the engaging portion 4 is extended, the engagement between the engaging portion 4 of the rubber crawler 1 and the engaging portion of the sprocket that engages with the engaging portion 4 becomes worse, and tooth skipping occurs. It is a cause to generate.

  Further, when the joint rubber 7 is vulcanized by the joint molding die 8, when the joint rubber 7 is filled into the joint vulcanized portion 12 of the cavity 8C of the joint molding die 8, as shown in FIG. The rubber (the lugs 3 and the engaging portions 4) in the long vulcanized portion 11 of the cavity 8C of the joint mold 8 is moved in the longitudinal direction outward side (in the crawler circumferential direction X of the joint mold 8) by the pressure F of the rubber. The rubber 3 and 4 are deformed by being pressed in the direction from the center to the end.

Most of the deformed rubbers 3 and 4 are restored to their original state after vulcanization, but in particular, the rubber crawler 1 having a long vulcanization time or the rubber crawler 1 having a thin rubber thickness cannot be restored. There is also.
As described above, when the rubbers 3 and 4 in the long vulcanized portion 11 are deformed when the joint rubber 7 is vulcanized by the joint vulcanized portion 12, the joint between the long belt-like rubber body 6 and the joint rubber body 9 is deformed. When the pitch P of the engaging portion 4 in the portion 17 is extended and the deformed rubbers 3 and 4 are not restored, the pitch P of the engaging portion 4 in the joint portion 17 between the long belt-like rubber body 6 and the joint rubber body 9 is As the pitch P increases, the engagement between the engaging portion 4 of the rubber crawler 1 and the engaging portion of the sprocket that engages with the engaging portion 4 is deteriorated, and tooth skipping occurs. Cause.

  An object of this invention is to provide the manufacturing apparatus of the rubber crawler 1 which can eliminate the said problem.

Technical measure taken by the present invention to solve the above technical problem, the engaging portion engaged with sprockets in the crawler circumferential direction A manufacturing apparatus of an endless belt-shaped rubber crawler having a predetermined pitch, Yes accommodated so as to face at a interval in the longitudinal direction end side portion of the closer end of the end strip of the long strip rubber member, and wherein the buried tensile cord to the elongated strip rubber member longitudinal end portion has a cavity capable of receiving and superimposing end side to each other extending from the portion, the portion for accommodating the in the cavity longitudinal end side portion (6b), superposed said end portions the pressure of the rubber during vulcanizing the joint rubber for connecting side each other, the longitudinal end from the portion to vulcanize the rubber the joint away the crawler circumferential direction Wherein the relief margin of 0.5~2mm such side portions is movable is provided.

  Another technical means is an apparatus for manufacturing a rubber crawler having an endless belt-like shape and engaging portions that engage with the sprocket at a predetermined pitch in the crawler circumferential direction. A long band-shaped rubber body in which the tensile cord is embedded is formed so that the end side of the cord extends, and both ends of the long band-shaped rubber body in the longitudinal direction are connected to both ends of the long band-shaped rubber body. For joints that are accommodated in a joint mold so as to face each other at an interval, and end portions of the tensile cords are overlapped with each other in the joint mold, and are arranged between both longitudinal ends of the long belt-like rubber body. In a rubber crawler manufacturing apparatus formed by vulcanizing rubber in a joint mold to connect both ends of a long rubber band with a joint rubber body, In the part that accommodates the both ends in the longitudinal direction of the long band-shaped rubber body of the tee, the both ends in the longitudinal direction of the long band-shaped rubber body are subjected to the joint rubber by the pressure of rubber when vulcanizing the joint rubber. Is provided with a clearance of 0.5 to 2 mm so as to move in a direction away from the crawler circumferential direction from the vulcanizing portion, and the pitch of the portion forming the engagement portion of the cavity of the joint molding die is changed to a long band-like rubber. The pitch at the joint portion between the body and the joint rubber body is shorter than the pitch of the other portions by the clearance allowance.

  Another technical means is an apparatus for manufacturing a rubber crawler having an endless belt-like engagement portion that engages with a sprocket at a predetermined pitch in the circumferential direction of the crawler, and forms an end-band-like long belt-like rubber body. Then, the both ends of the long band-shaped rubber body in the longitudinal direction are accommodated in a joint mold so that both ends of the long band-shaped rubber body face each other with a space therebetween, and the longitudinal direction of the long band-shaped rubber body In a rubber crawler manufacturing apparatus in which both ends of a long band-shaped rubber body are connected by a joint rubber body by vulcanizing the joint rubber disposed between both ends in the joint mold, The pitch of the portion that forms the engagement portion of the cavity is set so that the pitch at the joint portion between the long belt-like rubber body and the joint rubber body is 0.5 to 2 mm shorter than the pitch of the other portions. It is characterized in.

  According to the present invention, the long band-shaped rubber body is formed by the pressure of rubber when vulcanizing the joint rubber in the portion that accommodates both ends in the longitudinal direction of the long band-shaped rubber body of the cavity of the joint mold. By providing a clearance of 0.5 to 2 mm in order to move the both ends in the longitudinal direction from the portion vulcanizing the joint rubber in the direction away from the crawler circumferential direction, the end side portion of the long rubber band body Due to the movement of the joint rubber in the direction away from the crawler circumferential direction from the portion where the rubber for the joint is vulcanized, the looseness generated at the end of the tensile cord is bonded together, and the undulation of the tensile cord is generated. As a result, the concentration of stress that has conventionally been applied to the wavy portion is eliminated, and the durability of the rubber crawler can be improved.

  Further, in addition to the above configuration, the pitch of the portion forming the engagement portion of the cavity of the joint mold is set so that the pitch at the joint portion between the long belt-like rubber body and the joint rubber body is larger than the pitch of the other portions. When the end side portion of the long band-shaped rubber body is moved away from the portion for vulcanizing the joint rubber in the direction away from the crawler circumferential direction, the long band-shaped rubber body And the joint rubber body have substantially the same pitch as the pitch of the other parts, and the engagement between the engaging part of the rubber crawler and the engaging part of the sprocket engaged with the engaging part is poor. Thus, it is possible to prevent tooth skipping.

  In addition, the pitch of the part forming the engagement portion of the cavity of the joint mold is 0.5 to 2 mm shorter than the pitch of the other part at the joint between the long belt-like rubber body and the joint rubber body. As a result, when the joint rubber is vulcanized in the joint vulcanized portion, if the pitch of the engaging portion at the joint portion between the long rubber band and the joint rubber body increases, the long rubber band And the joint rubber body, the pitch of the engaging portion is substantially the same as the pitch of the other engaging portions, and the engaging portion of the rubber crawler and the engaging portion of the sprocket that engages with the engaging portion, It is possible to prevent tooth meshing from occurring and tooth skipping.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
1 and 2, reference numeral 8 denotes a joint molding die for jointing both ends of the long belt-like rubber body 6 shown in FIG.
In the present embodiment, the manufacturing apparatus of the rubber crawler 1 of a type that is a core crawlerless rubber crawler and in which the engaging portion 4 receives a driving force from the sprocket is illustrated, but the present invention is not limited thereto. Rather, the present invention is a cored type in which a cored bar is embedded at a predetermined pitch in the crawler circumferential direction X in the crawler body 2 and an engagement hole for inserting a sprocket engaging tooth is formed between the cored bars. You may employ | adopt in manufacturing the rubber crawler 1 of this. In this core crawler type rubber crawler 1, the portion where the engagement teeth of the sprocket engage is the engagement portion that receives the driving force from the sprocket.

1 and 2, the joint mold 8 is composed of an upper mold 8A and a lower mold 8B.
The cavity 8C of the joint mold 8 includes an end portion side portion 6b of the long belt-like rubber body 6 (the end portion side portion of the crawler main body portion 6a and the lug 3 and the engaging portion provided on the end portion side portion). 4) and a joint vulcanization part 12 for vulcanizing and molding a joint rubber body 9 for connecting the ends of the long belt-like rubber body 6 to each other.

The cavity 8C of the joint mold 8 is a portion 13 (crawler body forming portion) that forms the crawler body 2 at the center in the vertical direction, and a portion 14 that forms the lug 3 above the crawler body forming portion 13 ( The lower part of the crawler body forming part 13 is a part 15 (engaging part forming part) forming the engaging part 4.
The pitch A of the lug forming portion 14 and the engaging portion forming portion 14 of the cavity 8C of the joint mold 8 is the same size.

  Further, the shape of the lug forming portion 14 of the joint vulcanized portion 12 of the cavity 8C of the joint mold 8 is the same as the outer shape of the lug 3 of the long belt-like rubber body 6, and the cavity of the joint mold 8 The shape of the engaging portion forming portion 15 of the 8C joint vulcanized portion 12 is the same as the outer shape of the engaging portion 4 of the long belt-like rubber body 6, but the long length of the cavity 8C of the joint mold 8 is long. The lug forming portion 14 and the engaging portion forming portion 15 of the vulcanized portion 11 are formed slightly larger in the crawler circumferential direction X than the lug forming portion 14 and the engaging portion forming portion 15 of the joint vulcanized portion 12.

  That is, the lug forming portion 14 and the engaging portion forming portion 15 of the long vulcanized portion 11 of the joint mold 8 shown in FIGS. 1 and 2 include the long vulcanized portion of the joint mold 8 shown in FIG. 11 of the lug forming portion 14 and the engaging portion forming portion 15 on the outer side in the crawler circumferential direction X (the direction from the central portion to the end of the crawler circumferential direction X of the joint molding die 8) is cut. Thus, the long vulcanized portion 11 has the lug forming portion 14 and the engaging portion forming portion 15 on the outer side in the crawler circumferential direction X by the rubber pressure F when the joint rubber 7 is vulcanized. A clearance allowance 18 is provided for moving the longitudinal end portion 6b of the belt-like rubber body 6 away from the portion for vulcanizing the joint rubber 7 in the crawler circumferential direction X.

  This clearance allowance 18 is generated in the overlapping portion 10 of the tensile cord so that the corrugation 16 does not occur in the vicinity of the overlapping portion 10 (bonding portion) of the tensile cord 5 when the joint rubber 7 is vulcanized. The size of the rubber crawler 1 without a cored bar is about 1 to 2 mm, and the size of the rubber crawler 1 with a cored bar is about 0.5 to 1 mm. .

  In the joint molding die 8 shown in FIG. 1, when the ends of the long belt-like rubber body 6 are joined together, the end-side portion 6 a of the long belt-like rubber body 6 is joined to the long vulcanization of the joint molding die 8. The crawler main body portion of the long band-shaped rubber body 6 is accommodated in the portion 11 so that both ends in the longitudinal direction face each other with a space therebetween, and the end portions b and c of the tensile cord 5 in the joint vulcanizing portion 12 And put them together.

When the end portions b and c of the tensile cord 5 are overlapped with each other, the end portions b and c of the tensile cord 5 are tensioned so that the end of the long belt-like rubber body 6 is pulled toward the other. Let
Then, between the engaging part 4 of the long belt-like rubber body 6 and the engaging part forming part 15 of the joint molding die 8, and the lug formation of the lug 3 of the long belt-like rubber body 6 and the joint molding die 8. A gap corresponding to the clearance allowance 18 is formed between the portion 14 and the portion 14.

The bonding operation of the tensile cord 5 is performed manually, and loosening is inevitably generated in the bonded portion 10 of the tensile cord 5.
Next, the joint rubber 7 is put into the joint vulcanized portion 12 of the joint mold 8 (see FIG. 6B), the upper mold 8A and the lower mold 8B are closed, and the joint mold 8 is heated. Then, the joint rubber 7 is vulcanized.

  At this time, the lug 3 and the engaging portion 4 in the long vulcanized portion 11 are directed outward in the crawler circumferential direction X by the pressure F of the rubber when the joint rubber 7 is filled in the joint vulcanized portion 12. 9 (see FIG. 9). At this time, the clearance is long by the clearance 18 (the gap between the lug 3 of the long belt-like rubber body 6 and the lug forming portion 14 of the joint mold 8). The end side portion 6b of the rubber band 6 moves in the direction away from the portion vulcanizing the joint rubber 7 in the crawler circumferential direction X.

The end side portions 6b of the long belt-like rubber body 6 are attached to the end portions b and c of the tensile cord 5 by a force that moves in a direction away from the portion vulcanizing the joint rubber 7 in the crawler circumferential direction X. The looseness generated in the bonded portion 10 of the tensile strength cord 5 at the time of bonding is absorbed, and the occurrence of undulations 16 of the tensile strength cord 5 is prevented.
Further, by preventing the wavy 16 phenomenon, the stress concentration that has conventionally been applied to the wavy 16 portion is eliminated, and the durability of the rubber crawler 1 can be improved.

  Further, by providing the clearance allowance 18, conventionally, the lug 3 and the engaging portion in the long vulcanized portion 11 are caused by the pressure F of rubber when the joint vulcanized portion 12 is filled with the joint rubber 7. In the rubber crawler 1 having a long vulcanization time or a rubber crawler 1 having a small rubber thickness, etc., it is possible to prevent the lug 3 and the engaging portion 4 from being deformed by being pressed outward in the longitudinal direction. The problem that the deformed lug 3 and the engaging portion 4 cannot be restored can be solved.

Further, in the joint molding die 8 shown in FIG. 1, the end side portion 6 b of the long belt-like rubber body 6 moves in a direction away from the portion vulcanizing the joint rubber 7 in the crawler circumferential direction X. In addition, the pitch P of the engaging portion 4 at the joint portion 17 between the long belt-like rubber body 6 and the joint rubber body 9 is increased by the amount of movement.
This pitch elongation can be eliminated by the joint mold 8 in the form shown in FIG.

  In the joint mold 8 shown in FIG. 3, the pitches A and B of the engagement portion forming portions 15 of the cavity 8C of the joint mold 8 are set to the seams between the long belt-like rubber body 6 and the joint rubber body 9. The pitch B in the portion 17 is made shorter than the pitch A in the other portion by the clearance allowance of 18 minutes, and the crawler pitch P in the joint portion 17 becomes longer. The portion corresponding to the joint portion 17 is shortened to cope with it.

The other configuration is the same as that of the joint mold 8 shown in FIG.
In the joint mold 8 shown in FIG. 3, the pitch B of the engaging portion forming portion 15 in the joint portion 17 between the long belt-like rubber body 6 and the joint rubber body 9 is related to the other portions. Since the clearance portion 18 is shorter than the pitch A of the joining portion forming portion 15, when the ends of the long band-shaped rubber body 6 are joined together, the end-side portion 6 b of the long band-shaped rubber body 6 is a joint. When the rubber 7 is moved in a direction away from the crawler circumferential direction X from the portion where the rubber 7 is vulcanized, the pitch P of the engaging portion 4 at the joint portion 17 between the long belt-like rubber body 6 and the joint rubber body 9 is different from that of the other portions. The dimensions are substantially the same as the pitch P of the engaging portions 4.

As a result, it is possible to prevent the engagement between the engaging portion 4 of the rubber crawler 1 and the engaging portion of the sprocket that engages with the engaging portion 4 from being deteriorated and causing tooth skipping.
FIG. 4 shows a joint mold 8 according to another embodiment. In this joint mold 8, the lug forming portion 14 and the engaging portion forming portion 15 include the long vulcanized portion 11 and the vulcanized portion 11. Both the joint vulcanized portions 12 are formed in the same shape as the lugs 3 and the engaging portions 4 of the long belt-like rubber body 6, and the pitch A of the engaging portion forming portions 15 of the cavities 8C of the joint mold 8 is set. , B are formed such that the pitch B at the joint portion 17 between the long belt-like rubber body 6 and the joint rubber body 9 is shorter than the pitch A of the other portions.

The other configuration is the same as that of the joint molding die 8 shown in FIG.
In the joint mold 8 shown in FIG. 4, the dimension of the pitch B of the engaging portion forming portion 15 in the joint portion 17 between the long belt-like rubber body 6 and the joint rubber body 9 is determined by joint vulcanization. When the joint rubber 7 is vulcanized by the portion 12, the lug 3 in the long vulcanized portion 11 and the engagement are caused by the rubber pressure F when the joint rubber 7 is filled in the joint vulcanized portion 12. When the portion 4 is pressed, the lug 3 and the engaging portion 4 are deformed, and the pitch P of the engaging portion 4 at the joint portion 17 between the long belt-like rubber body 6 and the joint rubber body 9 is extended, and the deformed rubber is It is a dimension corresponding to the elongation when not restored, and is about 1 to 2 mm for the core crawlerless rubber crawler 1 and about 0.5 to 1 mm for the core crawler type rubber crawler 1. It is.

  In the joint mold 8 of this form, when the joint rubber 7 is vulcanized, the pitch P of the engaging portion 4 at the joint portion 17 between the long belt-like rubber body 6 and the joint rubber body 9 is extended. Since the pitch B of the engaging portion forming portion 15 in the joint portion 17 between the long belt-like rubber body 6 and the joint rubber body 9 of the joint molding die 8 is shortened in advance, the joint vulcanizing portion 12 is used for the joint. During the vulcanization of the rubber 7, when the pitch P of the engaging portion 4 in the joint portion 17 between the long belt-like rubber body 6 and the joint rubber body 9 is extended, the joint between the long belt-like rubber body 6 and the joint rubber body 9 is obtained. The engaging portion 4 of the sprocket that engages with the engaging portion 4 of the rubber crawler 1 and the engaging portion 4 has a pitch P of the engaging portion 4 in the portion 17 that is substantially the same as the pitch P of the other engaging portions 4. And bite It is possible to solve the problem that Align is to become to generate a tooth jumping bad.

It is sectional drawing of the shaping | molding die for joints. FIG. 2 is an enlarged cross-sectional view of a part of the joint mold shown in FIG. 1. It is sectional drawing of the shaping | molding die for other joints. It is sectional drawing of another shaping | molding die for joints. It is a side schematic structure figure of a rubber crawler. It is explanatory drawing for demonstrating the manufacturing process of a rubber crawler. It is side surface sectional drawing of the conventional shaping | molding die for joints. It is a figure of the rubber crawler which shows the conventional problem. It is sectional drawing at the time of rubber crawler manufacture which shows the conventional problem.

4 Engagement Section 5 Tensile Cord 6 Long Strip Rubber Body 6a End Side Part of Long Strip Rubber Body 7 Joint Rubber 8 Joint Mold (Rubber Crawler Manufacturing Equipment)
8C Cavity 9 Joint rubber body 17 Joint portion 18 Escape allowance b End side of the tensile cord c End side of the tensile cord A Long band-shaped rubber in the pitch of the portion forming the engagement portion of the cavity for the joint mold Pitch at the joint portion between the body and the joint rubber body B Of the pitch of the portion that forms the engagement portion of the cavity of the joint mold, other portions than the joint portion between the long belt-like rubber body and the joint rubber body Pitch F Rubber pressure when vulcanizing joint rubber P Pitch of rubber crawler engagement part X Crawler circumferential direction

Claims (3)

Engaging portion engaged with sprockets (4) in the crawler circumferential direction (X) A manufacturing apparatus of an endless belt-shaped rubber crawler having a predetermined pitch (P),
Longitudinal end side portion of the closer end of the closed end strip long strip rubber member (6) (6b) spaced intervals were housed so as to face and is embedded in the elongated strip rubber member (6) A cavity (8C) capable of accommodating the ends (b, c) extending from the longitudinal ends (6b) of the tensile cord (5) in an overlapping manner ;
The portion for accommodating the said longitudinal end side portion of the cavity (8C) (6b),
Superimposed said end side (b, c) by the pressure of the rubber during vulcanizing the rubber joint (7) for connecting to each other (F), the portion to vulcanize the rubber (7) for the joint from the crawler circumferential direction the longitudinal end side portion in a direction away (X) (6b) escapes margin of 0.5~2mm so as to be movable (18) of the rubber crawler, wherein a provided manufacturing device. A rubber crawler manufacturing apparatus having an endless belt-like engagement portion (4) that engages with a sprocket at a predetermined pitch (P) in the crawler circumferential direction (X),
A long belt-like rubber body (6) in which the tensile cord (5) is embedded is formed so that the end side (b, c) of the tensile cord (5) extends from both ends in the longitudinal direction. Then, both end portions (6b) in the longitudinal direction of the long band-shaped rubber body (6) are placed in the joint mold (8) so that both ends of the long band-shaped rubber body (6) face each other with a space therebetween. And the end portions (b, c) of the tensile cord (5) are overlapped with each other in the joint mold (8) and disposed between both ends in the longitudinal direction of the long rubber band (6). A rubber crawler manufacturing apparatus formed by vulcanizing a joint rubber (7) in a joint mold (8) to connect both ends of a long rubber band (6) with a joint rubber body (9). In
Rubber for vulcanizing the joint rubber (7) in the portion (6b) in the longitudinal direction of the long band-like rubber body (6) of the cavity (8C) of the joint mold (8) With the pressure (F), the both ends (6b) in the longitudinal direction of the long rubber band (6) are moved away from the portion for vulcanizing the joint rubber (7) in the crawler circumferential direction (X). As much as possible to provide a clearance of 0.5-2mm (18),
The pitch (A, B) of the portion that forms the engagement portion (4) of the cavity (8C) of the joint mold (8) is set to the seam between the elongated rubber body (6) and the joint rubber body (9). The rubber crawler manufacturing apparatus, wherein the pitch (B) in the portion (17) is shorter than the pitch (A) of the other portion by the clearance (18). A rubber crawler manufacturing apparatus having an endless belt-like engagement portion (4) that engages with a sprocket at a predetermined pitch in the crawler circumferential direction (X),
A long band-shaped rubber body (6) having a closed band shape is formed, and both end portions (6b) in the longitudinal direction of the long band-shaped rubber body (6) are spaced from both ends of the long band-shaped rubber body (6). The joint rubber (7), which is accommodated in the joint mold (8) so as to face each other and disposed between both ends in the longitudinal direction of the long belt-like rubber body (6), is placed in the joint mold (8). In the rubber crawler manufacturing apparatus formed by vulcanizing and connecting both ends of the long rubber band (6) with the joint rubber body (9),
The pitch (A, B) of the portion (15) forming the engaging portion (4) of the cavity (8C) of the joint mold (8) is changed to the long rubber band (6) and the joint rubber body (9). The pitch (B) in the joint part (17) with the other part is 0.5 to 2 mm shorter than the pitch (A) of the other part.

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