JP2007331293A - Manufacturing method of pneumatic tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid the occurrence of a crack in the vicinity of the base part of a patch wall part 33 during the vulcanization of a green tire 1'. <P>SOLUTION: A patch bonding part 31 is pasted on the surface of the inner liner 19 in the green tire 1' to set an attaching rubber patch 29 to the inner liner 19, a spacer 39 is inserted in the gap between a pair of the patch wall parts 33 to be set to the attaching rubber patch 29, the green tire 1' is vulcanized while pressurizing the green tire 1' from the inside by a bladder 41 not only to mold the green tire 1' into a predetermined product shape but also to bond the patch bonding part 31 to the surface of the inner linear 19 by crosslinking reaction and the spacer 39 is detached from the attaching rubber patch 29. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a pneumatic tire for manufacturing a pneumatic tire in which a mounting rubber patch is mounted on a surface of an inner liner from a raw tire.

  In recent years, electronic devices such as transponders are often mounted on the inner liner side of pneumatic tires in order to measure the internal pressure of pneumatic tires. A rubber patch is used.

  And when attaching an attachment rubber patch firmly to the surface of an inner liner using the vulcanization process of a green tire, it carries out as follows.

  That is, the mounting rubber patch is attached to the surface of the inner liner of the green tire (unvulcanized tire before being completed as a pneumatic tire), and the mounting rubber patch is set on the inner liner of the green tire. Subsequently, the raw tire is vulcanized while being pressed from the inside by a bladder to form the raw tire into a predetermined product shape, and the mounting rubber patch is bonded to the inner liner by a crosslinking reaction.

  As described above, the attachment rubber patch can be firmly attached to the surface of the inner liner. In other words, a pneumatic tire including the attachment rubber patch can be manufactured from a raw tire.

In addition, there exist some which are shown to patent document 1 and patent document 2 as a prior art relevant to this invention.
JP 2000-168321 A JP 2000-168322 A

  By the way, in order to suppress the rattling of the electronic device with respect to the mounting rubber patch and stabilize the mounting state of the electronic device, there is a pair of patch wall portions that regulate the movement of the electronic device on the surface of the patch adhesive portion in the mounting rubber patch. Sometimes they are integrally formed facing each other. On the other hand, if a mounting rubber patch having a pair of patch wall portions is attached to the surface using the raw tire vulcanization process, the pair of patch wall portions will receive the force from the bladder in a concentrated manner and fall down. Deforms greatly. For this reason, the gap between the pair of patch walls becomes narrow, and an electronic device cannot be set between the pair of patch walls, or cracks occur due to stress concentration near the base of the patch wall during vulcanization of raw tires. There is a problem that it becomes easy to do.

  Therefore, in order to solve the above-described conventional problems, the present invention has a novel structure that can sufficiently suppress the pair of patch wall portions in the mounting rubber patch from being deformed so as to fall when the raw tire is vulcanized. It aims at providing the manufacturing method of a entering tire.

A first feature of the present invention (a feature of the invention described in claim 1) is an attachment in which a pair of patch wall portions for restricting movement of the electronic device are opposed to and integrally formed from the raw tire to the patch adhesive portion. A pneumatic tire manufacturing method for manufacturing a pneumatic tire in which a rubber patch is attached to a surface of an inner liner, the spacer being inserted between a pair of the patch wall portions and set on the mounting rubber patch After completion of the setting step, the patch setting step of attaching the patch adhesive portion to the surface of the inner liner in the green tire, and setting the mounting rubber patch on the inner liner, the spacer setting step and the patch setting step The raw tire is vulcanized while pressurizing the raw tire from the inside with a bladder. With molded to a constant product shape, and vulcanizing step of bonding by crosslinking the patch adhesive portion on the surface of the inner liner,
And a spacer removal step of removing the spacer from the mounting rubber patch after the vulcanization step is completed.

  Here, the patch setting process may be started after the spacer setting process is completed, or the spacer setting process may be started after the patch setting process is completed. In addition to the pair of patch wall portions, another pair of patch wall portions having wall surfaces orthogonal to the wall surfaces of the pair of patch wall portions are integrally opposed to the patch adhesive portion in the mounting rubber patch. It may be formed.

  In addition, the said raw tire means the unvulcanized tire before completing as the said pneumatic tire.

  According to the first feature, since the spacer is inserted between a pair of patch wall portions and set to the mounting rubber patch before the raw tire is pressurized from the inside by the bladder, the raw tire The force that the pair of patch wall portions received intensively from the bladder when vulcanizing can be shared and received by the spacer. Thereby, when the raw tire is vulcanized (during the vulcanization step), it is possible to sufficiently suppress the pair of patch wall portions from being deformed so as to fall down.

  According to a second feature of the present invention (a feature of the invention described in claim 2), in addition to the first feature, tapered surfaces are formed on both end sides in one direction of the spacer, and the spacer set is provided. In the step, the spacer is set on the mounting rubber patch such that the pair of tapered surfaces of the spacer intersect with the wall surface of the patch wall portion.

  According to the second feature, when the raw tire is vulcanized, the bladder is set so that the spacer is set on the mounting rubber patch so that the pair of tapered surfaces intersects the wall surface of the patch wall portion. Is elastically deformed along the tapered surface, and air hardly remains between the surface of the inner liner and the bladder in the green tire.

  According to a third feature of the present invention (a feature of the invention described in claim 3), in addition to the first feature or the second feature, in the patch setting step, the wall surfaces of the pair of patch wall portions are tire widths. The patch adhesion portion is attached to the surface of the inner liner of the green tire under a state of extending along the direction.

  According to the third feature, under the state where the wall surfaces of the pair of patch wall portions extend along the tire width direction, the patch adhesive portion is attached to the surface of the inner liner in the raw tire. While the pneumatic tire is running, it is possible to sufficiently prevent the electronic device from rattling due to input accompanying the expansion and contraction operation of the pneumatic tire in the tire circumferential direction, and the electronic device is more stably attached. .

  According to a fourth feature of the present invention (a feature of the invention described in claim 4), in addition to the third feature, in the spacer setting step, the mounting rubber patch is contracted in the tire circumferential direction to form a pair of the patch wall portions. Is attached to the surface of the inner liner of the green tire under a state in which is slightly approached.

  According to a fourth feature, the patch adhesive portion is affixed to the surface of the inner liner in the raw tire under a state in which the mounting rubber patch is contracted in the tire circumferential direction and the pair of patch wall portions are slightly approached. Therefore, even if the mounting rubber patch extends in the tire circumferential direction by vulcanization of the raw tire, the distance in the tire circumferential direction between the wall surfaces of the pair of patch wall portions is considerably larger than the width of the electronic device. Absent.

  According to a fifth feature of the present invention (a feature of the invention described in claim 5), in addition to any one of the first to fourth features, the spacer is made of a vulcanized rubber material. It is to become.

  A sixth feature of the present invention (a feature of the invention described in claim 6) is a rubber material in which the mounting rubber patch is vulcanized in addition to any one of the first to fifth features. It consists of

  According to a seventh feature of the present invention (a feature of the invention described in claim 7), in addition to any one of the first to sixth features, the height of the spacer is the patch wall portion. It is substantially the same as the height of the wall.

  According to the invention described in any one of claims 1 to 7, when the raw tire is vulcanized, it is possible to sufficiently suppress the pair of patch wall portions from being deformed so as to fall down. Therefore, the gap between the pair of patch wall portions can be maintained at an appropriate interval, and the electronic device can be reliably set between the pair of patch wall portions, and the patch during vulcanization of the raw tire The stress concentration in the vicinity of the base of the wall can be relaxed, and the occurrence of cracks in the vicinity of the base of the patch wall can be avoided.

  An embodiment of the present invention will be described with reference to FIGS.

  Here, FIG. 1A is a view showing a spacer setting step in the method for manufacturing a pneumatic tire according to the embodiment of the present invention, and FIG. 1B is a view of FIG. 2 (a) is a diagram showing a patch setting process in the method for manufacturing a pneumatic tire according to the embodiment of the present invention, FIG. 2 (b) is a diagram when FIG. 1 (a) is viewed from above, and FIG. The figure which shows the vulcanization | cure process in the manufacturing method of the pneumatic tire which concerns on embodiment of this invention, FIG. 4: the figure which shows the spacer removal process in the manufacturing method of the pneumatic tire which concerns on embodiment of this invention, Fig.5 (a) FIG. 5 is a view showing the mounting rubber patch according to the embodiment with the transponder attached, FIG. 5B is a view of FIG. 5A viewed from above, and FIG. 6 is a pneumatic tire according to the embodiment of the present invention. FIG.

  As shown in FIG. 6, the pneumatic tire 1 according to the embodiment includes a pair of annular bead portions 5 that can be filled with air as a working gas and can be fitted to the rim 3. Each bead portion 5 includes a bead core 7 and a bead filler 9 disposed outside the bead core 7 in the tire radial direction R. The bead core 7 and the bead filler 9 in one bead portion 5 are connected to one end of a toroidal carcass 11 as a skeleton member so as to be folded back from the inner side in the tire width direction W to the other bead. The other end portion of the carcass 11 is connected to the bead core 7 and the bead filler 9 in the portion 5 so as to be folded back from the inner side in the tire width direction W.

  A tread portion 13 is provided in the crown region of the outer peripheral surface of the carcass 11, and a so-called two-layer belt 15 that exhibits a so-called effect is provided between the carcass 11 and the tread portion 13. Further, sidewall portions 17 are provided between the tread portion 13 and the one bead portion 5 and between the tread portion 13 and the other bead portion 5 on the outer surface of the carcass 11. Further, an inner liner 19 is provided on the inner surface of the carcass 11 to prevent air leakage.

  As shown in FIGS. 5 (a) and 5 (b), a transponder 21 is attached to the front side of the inner liner 19, and this transponder 21 is one of electronic devices for measuring tire internal pressure and the like. It is used for. The transponder 21 includes a box-type transponder main body 23 as an electronic device main body. The transponder main body 23 is molded from a resin and incorporates various electronic components (not shown). Further, an engagement pin 25 is provided at the head of the transponder body 23, and a button 27 larger than the diameter of the engagement pin 25 is provided at the distal end side of the engagement pin 25.

  Next, the attachment rubber patch 29 for attaching the transponder 21 to the front side of the inner liner 19 will be described.

  As shown in FIGS. 5 (a) and 5 (b), a pair of patch adhesive portions 31 are provided in the back side region of the tread portion 13 on the surface of the inner liner 19, and the pair of patch adhesive portions 31 are arranged around the tire circumference. Separated in direction C. The pair of patch adhesion portions 31 may be a single patch adhesion portion without being separated.

  A pair of patch wall portions 33 projecting inward in the tire radial direction R are integrally formed on the surface of the pair of patch bonding portions 33 so as to be opposed to each other, and the pair of patch wall portions 33 regulate the movement of the transponder 21. To do. Further, the wall surface 33 f of each patch wall portion 33 extends substantially in parallel along the tire width direction W.

  Between the pair of patch wall portions 33, a patch connecting portion 35 capable of locking the head of the transponder body 23 is integrally formed. The patch connecting portion 35 includes an engaging pin 25 and an engaging pin 25. An engagement hole 37 that can be engaged is formed. Further, it is desirable that the one patch wall portion 33 through the patch connecting portion 35 to the other patch wall portion 33 is reinforced by a reinforcing fiber (not shown).

  Then, the manufacturing method of the pneumatic tire which concerns on embodiment of this invention is demonstrated.

  The pneumatic tire manufacturing method according to the embodiment of the present invention includes a pneumatic tire 1 in which an attachment rubber patch 29 is attached to the surface of the inner liner 19 from the raw tire 1 ′ (in other words, an air equipped with the attachment rubber patch 29. A manufacturing method for manufacturing a tire 1), which includes a spacer setting step, a patch setting step, a vulcanization step, and a spacer removal step as follows. The raw tire 1 ′ refers to an unvulcanized tire before being completed as the pneumatic tire 1.

Spacer setting step As shown in FIGS. 1A and 1B, a spacer 39 made of a vulcanized rubber material and a mounting rubber patch 29 made of a vulcanized rubber material are prepared. Here, taper surfaces 39 a are respectively formed at both ends of the spacer 39 in one direction, and the height of the spacer 39 is substantially the same as the height of the wall surface of the patch wall portion 33. Then, a spacer 39 is inserted between the pair of patch walls 33 from one tapered surface 39a, and the spacer 39 is temporarily fixed to the mounting rubber patch 29 with an adhesive. Accordingly, the spacer 39 can be set on the attachment rubber patch 29 so that the pair of tapered surfaces 39a intersect the wall surface 33f of the patch wall portion 33.

  Instead of using the spacer 39 made of a vulcanized rubber material, a spacer made of a resin material may be used.

Patch Setting Step After the spacer setting step is finished, as shown in FIGS. 2A and 2B, the wall surfaces 33f of the pair of patch wall portions 33 extend substantially in parallel along the tire width direction W, and the attachment rubber patch 29 The patch adhesive portion 31 is attached to the surface of the inner liner 19 of the raw tire 1 ′ in a state where the pair of patch wall portions 33 are slightly brought close to each other in the tire circumferential direction C. Thereby, the attachment rubber patch 29 can be set on the inner liner 19.

Vulcanization Step After the spacer setting step is completed, as shown in FIGS. 3A and 3B, the raw tire 1 ′ is pressurized from the inside by a bladder 41 and the raw tire 1 is placed in a vulcanization mold (not shown). 'Vulcanize. Thus, the raw tire 1 ′ can be molded into a predetermined product shape, and the pair of patch adhesion portions 31 can be adhered to the surface of the inner liner 19 by a crosslinking reaction.

Spacer Removal Step After the vulcanization step is completed, the spacer 39 is removed from the attachment rubber patch 29 as shown in FIG.

  As described above, the pneumatic tire 1 including the attachment rubber patch 29 can be manufactured from the raw tire 1 ′. Instead of starting the spacer setting process after the patch setting process is completed, the patch setting process may be started after the spacer setting process is completed.

  Note that the patch connecting portion 35 may be omitted from the attachment rubber patch 29 and the transponder body 23 may be bonded to the patch bonding portion 31 with an adhesive. Further, an electronic device other than the transponder 21 may be attached to the attachment rubber patch 29.

  Then, the effect | action and effect of embodiment of this invention are demonstrated.

  Since the spacer 39 is inserted between the pair of patch wall portions 33 and set to the mounting rubber patch 29 before the raw tire 1 ′ is pressurized from the inside by the bladder 41, the raw tire 1 ′ is vulcanized. In addition, the force that the pair of patch wall portions 33 received in a concentrated manner from the bladder 41 can be shared and received by the spacer 39. Thereby, when the raw tire 1 ′ is vulcanized (during the vulcanization process), it is possible to sufficiently suppress the pair of patch wall portions 33 from being deformed so as to fall down.

  Further, since the spacer 39 is set on the mounting rubber patch 29 so that the pair of tapered surfaces 39a intersect the wall surface 33f of the patch wall portion 33, when the raw tire 1 'is vulcanized, FIG. As shown in FIG. 3, the bladder 41 is elastically deformed along the tapered surface 39a, so that air hardly remains between the surface of the inner liner 19 and the bladder 41 in the raw tire 1 ′.

  Further, with the wall surfaces 33f of the pair of patch wall portions 33 extending substantially in parallel along the tire width direction W, the pair of patch adhesion portions 31 are attached to the surface of the inner liner 19 in the raw tire 1 ′. Therefore, when the pneumatic tire 1 is traveling, the transponder 21 is sufficiently prevented from rattling due to input accompanying the expansion and contraction operation of the pneumatic tire 1 in the tire circumferential direction C, and the transponder 21 is more attached. Stabilize.

  Further, the pair of patch adhesive portions 33 are attached to the surface of the inner liner 19 in the raw tire 1 ′ in a state where the mounting rubber patch 29 is contracted in the tire circumferential direction C and the pair of patch wall portions 33 are slightly approached. Therefore, even if the attachment rubber patch 29 extends in the tire circumferential direction C due to vulcanization of the raw tire 1, the distance in the tire circumferential direction C between the wall surfaces of the pair of patch wall portions 33 is considerably larger than the width of the transponder 21. There is nothing.

  As described above, according to the embodiment of the present invention, when the raw tire 1 ′ is vulcanized, the pair of patch wall portions 33 can be sufficiently prevented from being deformed so as to fall down. The transponder 21 can be reliably set between the pair of patch wall portions 33 while maintaining a proper distance, and stress concentration near the base of the patch wall portion 33 during vulcanization of the raw tire 1 'can be reduced. Thus, the occurrence of cracks near the base of the patch wall portion 33 can be avoided.

  Further, when the raw tire 1 'is vulcanized, the bladder 41 is elastically deformed along the taper surface 39a, and air hardly remains between the surface of the inner liner 19 and the bladder 41 in the raw tire 1'. Therefore, the raw tire 1 'is completely vulcanized, and bear defects can be suppressed.

  Further, during the running of the pneumatic tire 1, it is possible to sufficiently suppress the rattling of the transponder 21 due to the input accompanying the expansion and contraction operation of the pneumatic tire 1 in the tire circumferential direction, and the mounting state of the transponder 21 becomes more stable. Therefore, the durability of the transponder 21 itself can be improved.

(Modification)
A modification of the embodiment of the present invention will be briefly described with reference to FIGS.

  Here, FIG. 7 is a perspective view of a mounting rubber patch according to a modification of the embodiment of the present invention, FIG. 8A is a view taken along the line AA in FIG. 7, and FIG. 7 is a view taken along line BB in FIG.

  In the pneumatic tire manufacturing method according to the embodiment of the present invention, the mounting rubber patch 29 may be changed to the mounting rubber patch 43 as shown in FIG. It becomes as follows.

  That is, as shown in FIGS. 7 and 8A and 8B, the mounting rubber patch 43 is made of a vulcanized rubber material and includes a frame-shaped patch bonding portion 45. In addition, a pair of first patch wall portions 47 that regulate the movement of the transponder 21 in the tire circumferential direction C are integrally formed on the surface of the patch bonding portion 45 so as to face each other. A first patch claw portion 49 capable of locking the head of the transponder body 23 is integrally formed on the distal end side. Similarly, a pair of second patch wall portions 51 that regulate the movement of the tire width W of the transponder 21 are integrally formed between the pair of patch wall portions 47 on the surface of the patch adhesive portion 45 so as to face each other. A second patch claw portion 53 capable of locking the head of the transponder body 23 is integrally formed at the distal end side of each second patch wall portion 51. Here, the pair of first patch wall portions 47 and the pair of second patch wall portions 51 are configured in a frame shape so as to be connected to each other, and the pair of first patch claw portions 49 and the pair of second patches. The nail | claw part 53 is comprised by frame shape so that it may mutually connect.

  Further, when the mounting rubber patch 29 is changed to the mounting rubber patch 43, a square plate shape as shown in FIG. 7 is used in place of the spacer 39 in the implementation of the manufacturing method of the pneumatic tire according to the embodiment of the present invention. The spacer 55 is used.

  In addition, this invention is not restricted to description of the above-mentioned embodiment, It can implement in a various aspect as follows. Further, the scope of rights encompassed by the present invention is not limited to these embodiments.

Fig.1 (a) is a figure which shows the spacer setting process in the manufacturing method of the pneumatic tire which concerns on embodiment of this invention, FIG.1 (b) is the figure which looked at Fig.1 (a) from the top. Fig.2 (a) is a figure which shows the patch setting process in the manufacturing method of the pneumatic tire which concerns on embodiment of this invention, FIG.2 (b) is the figure which looked at Fig.1 (a) from the top. It is a figure which shows the vulcanization | cure process in the manufacturing method of the pneumatic tire which concerns on embodiment of this invention. It is a figure which shows the spacer removal process in the manufacturing method of the pneumatic tire which concerns on embodiment of this invention. Fig.5 (a) is a figure which shows the attachment rubber patch which concerns on embodiment of the state which attached the transponder, FIG.5 (b) is the figure which looked at Fig.5 (a) from the top. It is a fragmentary sectional view of the pneumatic tire concerning the embodiment of the present invention. It is a perspective view of an attachment rubber patch concerning a modification of an embodiment of the present invention. 8A is a view taken along the line AA in FIG. 7, and FIG. 8B is a view taken along the line BB in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pneumatic tire 1 'Raw tire 19 Inner liner 21 Transponder 23 Transponder main body 25 Engagement pin 29 Attachment rubber patch 31 Patch adhesion part 33 Split patch adhesion part 33 Patch wall part 33f Wall surface 39 Spacer 41 Bladder

Claims (7)

Pneumatic for manufacturing a pneumatic tire in which a mounting rubber patch is formed on a surface of the inner liner by integrally forming a pair of patch walls that regulate the movement of the electronic device from the raw tire to the patch bonding part. A tire manufacturing method comprising:
A spacer setting step of inserting a spacer between the pair of patch wall portions and setting the mounting rubber patch;
A patch setting step of attaching the patch adhesive part to the surface of the inner liner in the green tire and setting the mounting rubber patch on the inner liner;
After the spacer setting step and the patch setting step are finished, the raw tire is vulcanized while being pressurized from the inside by a bladder, thereby forming the raw tire into a predetermined product shape, and A vulcanization step of adhering the patch adhesion part to the surface of the inner liner by a crosslinking reaction;
After the vulcanization step is completed, a spacer removal step of removing the spacer from the mounting rubber patch,
A method for producing a pneumatic tire, comprising: Tapered surfaces are formed on both ends in one direction of the spacer,
2. The air according to claim 1, wherein in the spacer setting step, the spacer is set on the attachment rubber patch such that a pair of tapered surfaces of the spacer intersect a wall surface of the patch wall portion. A method for manufacturing a tire.   In the spacer setting step, the patch adhesive portion is attached to the surface of the inner liner in the raw tire under a state where the wall surfaces of the pair of patch wall portions extend in the tire width direction. The manufacturing method of the pneumatic tire of Claim 1 or Claim 2.   In the spacer setting step, the patch adhesive portion is affixed to the surface of the inner liner in the green tire under a state in which the mounting rubber patch is contracted in the tire circumferential direction and the pair of patch wall portions are slightly approached. The manufacturing method of the pneumatic tire of Claim 3 characterized by these.   The method for manufacturing a pneumatic tire according to any one of claims 1 to 4, wherein the spacer is made of a vulcanized rubber material.   The method for manufacturing a pneumatic tire according to any one of claims 1 to 5, wherein the mounting rubber patch is made of a vulcanized rubber material.   The method for manufacturing a pneumatic tire according to any one of claims 1 to 6, wherein a height of the spacer is substantially the same as a height of a wall surface of the patch wall portion. .

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