JP4878939B2 - Pneumatic tire manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a pneumatic tire for manufacturing a pneumatic tire having a rubber patch attached to the surface of an inner liner from a raw tire.

  In recent years, in order to measure the internal pressure or the like of a pneumatic tire, an electronic device such as a transponder is often attached to the inner liner side of the pneumatic tire, and the electronic device can be attached to the surface of the inner liner. A rubber patch is used.

  And when attaching a rubber patch to the surface of an inner liner firmly using the vulcanization process of a raw tire, it carries out as follows. That is, the 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 set on the inner liner of the green tire. Subsequently, the raw tire is vulcanized while being pressurized from the inside of the raw tire by a bladder, thereby forming the raw tire into a predetermined product shape and adhering the rubber patch to the surface of the inner liner by a crosslinking reaction. Thereby, the rubber patch can be firmly attached to the surface of the inner liner, in other words, a pneumatic tire provided with the rubber patch can be manufactured from the 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, the rubber patch protrudes with respect to the surface of the inner liner, and when the raw tire is vulcanized, the rubber patch receives the force from the bladder intensively. Therefore, a large pressure is locally applied around the rubber patch in the inner liner, and the rubber patch may sink into the surface of the inner liner. On the other hand, when the raw tire is vulcanized, if the rubber patch digs into the surface of the inner liner, after manufacturing the pneumatic tire, local deformation remains in the cord of the belt that is a constituent member of the pneumatic tire, There is a problem that the original tire performance of a pneumatic tire, in particular, uneven wear resistance performance cannot be fully exhibited.

  Therefore, in order to solve the above-mentioned problem, the present invention relaxes the pressure acting locally on the periphery of the rubber patch in the inner liner when vulcanizing the raw tire, and suppresses the rubber patch from sinking into the surface of the inner liner. An object of the present invention is to provide a method for manufacturing a pneumatic tire having a novel configuration that can be performed.

  A first means of the present invention (characteristic of the invention described in claim 1) is a method of manufacturing a pneumatic tire for manufacturing a pneumatic tire having a rubber patch attached to the surface of an inner liner from a raw tire. The rubber patch is affixed to the surface of the inner liner of the raw tire and set on the inner liner of the raw tire, and the housing recess formed in the spacer after the patch setting step is completed. After the spacer setting step is completed, the spacer is set on the inner liner of the green tire by attaching the spacer to the surface of the inner liner of the green tire so that the rubber patch is accommodated in The raw tire is pressurized from the inside of the raw tire by a bladder. By vulcanizing the ear, the raw tire is molded into a predetermined product shape, and the rubber patch is bonded to the surface of the inner liner by a crosslinking reaction, and after the vulcanization step is completed, A spacer removing step of removing the spacer from the inner liner.

  Here, the storage recess includes a storage hole, a storage groove, and the like.

  According to the first feature, before the raw tire is vulcanized, the spacer is set on the inner liner of the raw tire under a state where the rubber patch is received in the receiving recess of the spacer. Therefore, the force that the rubber patch intensively receives from the bladder when the raw tire is vulcanized can also be shared and received by the spacer. Thereby, when the green tire is vulcanized, the pressure acting locally around the rubber patch in the inner liner can be relieved, and the rubber patch can be prevented from sinking into the surface of the inner liner.

  The second means of the present invention (characteristic of the invention described in claim 2) is a method of manufacturing a pneumatic tire for manufacturing a pneumatic tire having a rubber patch attached to the surface of an inner liner from a raw tire. A spacer setting step of attaching a spacer to the surface of the inner liner of the green tire and setting the spacer on the inner liner of the green tire, and so that the rubber patch is received in a receiving recess formed in the spacer. The rubber patch is attached to the surface of the inner liner of the raw tire and set on the inner liner of the raw tire, and after the patch setting step is finished, the bladder is used to insert the rubber patch from the inside of the raw tire. By vulcanizing the raw tire while applying pressure, A vulcanization step in which the rubber patch is bonded to the surface of the inner liner by a crosslinking reaction, and a spacer removal step in which the spacer is removed from the inner liner after the vulcanization step is completed. , Is provided.

  According to the second feature, before the raw tire is vulcanized, the spacer is set on the inner liner of the raw tire under a state where the rubber patch is received in the receiving recess of the spacer. Therefore, the force that the rubber patch intensively receives from the bladder when the raw tire is vulcanized can also be shared and received by the spacer. Thereby, when the green tire is vulcanized, the pressure acting locally around the rubber patch in the inner liner can be relieved, and the rubber patch can be prevented from sinking into the surface of the inner liner.

  According to a third feature (feature of the invention described in claim 3) of the present invention, in addition to the first feature or the second feature, the spacer is in a sheet form, and in the spacer setting step, the sheet form is formed. Is affixed to the surface of the inner liner of the green tire and set on the inner liner of the green tire.

  The fourth feature of the present invention (the feature of the invention described in claim 4) is that, in addition to the first feature or the second feature, the spacer is strip-shaped, and in the spacer setting step, the strip-shaped A spacer is stuck on the ring of the surface of the inner liner in the green tire and is set on the inner liner in the green tire.

  According to a fifth feature (feature of the invention described in claim 5) of the present invention, in addition to any one of the first to fourth features, in the spacer setting step, the front side of the spacer The spacer is affixed to the surface of the inner liner of the raw tire so that the spacer overlaps from one edge to the other edge of the belt of the green tire when viewed from the side. Setting on the inner liner of the tire.

  According to a sixth feature of the present invention (a feature of the invention described in claim 6), in addition to any one of the first feature to the fifth feature, the receiving recess of the spacer is the electronic device. The shape is similar to that of the electronic device main body.

  According to a seventh feature (feature of the invention described in claim 7) of the present invention, in addition to any one of the first feature to the sixth feature, the depth of the accommodating recess is the electronic device. It is substantially the same as the thickness of the electronic device main body.

  The eighth feature of the present invention (the feature of the invention described in claim 8) is that in addition to any one of the first feature to the seventh feature, the front surface and the back surface on the peripheral side of the spacer, Is an angle of 10 degrees or less.

  According to a ninth feature of the present invention (a feature of the invention described in claim 9), in addition to any one of the first to eighth features, the rubber material is made of the same material as the bladder. It is to become.

  Here, the same material as the bladder is specifically butyl rubber or chloroprene rubber.

In addition to any one of the first to ninth features, the tenth feature of the present invention (the feature of the invention according to claim 10) is characterized in that after the spacer removing step is completed, And an electronic device attaching step for attaching the electronic device to the surface of the rubber patch.

  According to the invention of any one of claims 1 to 10, when the raw tire is vulcanized, the pressure acting locally around the rubber patch in the inner liner is relieved, Since the rubber patch can be prevented from sinking into the surface of the inner liner, no local deformation remains in the cord of the belt, which is a constituent member of the pneumatic tire, after the pneumatic tire is manufactured. The original tire performance of the pneumatic tire can be sufficiently exhibited.

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

  Here, FIG. 1A is a diagram for explaining a patch setting process in the method for manufacturing a pneumatic tire according to the embodiment of the present invention, and FIG. 1B is a top view of FIG. 1A. FIG. 2A is a view for explaining a spacer setting step in the method for manufacturing a pneumatic tire according to the embodiment of the present invention, and FIG. 2B is a view of FIG. 2A as viewed from above. FIG. 3 is an enlarged view of the spacer according to the embodiment of the present invention, FIG. 4A is a side view of the raw tire in a state where a sheet-like spacer is attached to the surface of the inner liner, and FIG. FIG. 5 is a side view of a raw tire in a state where a belt-like spacer is attached to the annular shape of the surface of the inner liner. FIG. 6 is a manufacture of a pneumatic tire according to an embodiment of the present invention. FIG. 7 is a view for explaining a spacer removing step in the method, FIG. 7 is a view for explaining an electronic device attaching step in the method for manufacturing a pneumatic tire according to the embodiment of the present invention, and FIG. 8 is an air according to the embodiment of the present invention. It is a fragmentary sectional view of an entering tire.

  As shown in FIG. 8, the pneumatic tire 1 according to the embodiment of the present invention includes a pair of bead portions 5 that can be fitted to the rim 3. Each bead portion 5 includes a bead core 7 and the bead core 7. And a bead wheeler 9 disposed on the outer side in the tire radial direction R. Further, one end portion of the toroidal carcass 11 is connected to the bead core 7 in one bead portion 5 so as to be folded back from the inner side to the outer side in the tire width direction W, and the bead core 7 in the other bead portion 5 is The other end of the carcass 11 is connected so as to be folded back from the inside in the tire width direction W. Here, the carcass 11 has a plurality of steel cords (not shown) extending in the radial direction.

  In the crown region of the carcass 11, for example, a two-layer belt 13 is provided. The belt 13 exhibits a so-called effect, and a number of steels extending in a direction inclined in the tire circumferential direction C. The cord 15 is covered with rubber. A tread portion 17 is provided on the outer peripheral surface of the belt 13, and a plurality of circumferential main grooves 19 extending in the tire circumferential direction C are formed in the tread portion 17. Further, sidewall portions 21 are provided between the tread portion 17 on one side surface of the carcass 11 and the one bead portion 5 and between the tread portion 17 and the other bead portion 5 on the other side surface of the carcass 11, respectively. Yes. Furthermore, an inner liner 23 is provided on the inner surface of the carcass 11 to prevent air leakage.

  A rectangular rubber patch 25 is attached to the surface of the inner liner 23, and this rubber patch 25 is used for attaching the transponder 27. Here, the transponder 27 is an electronic device that measures tire internal pressure and the like, and includes a transponder main body 29 as an electronic device main body molded from resin, and a plurality of electronic components (not shown) built in the transponder main body 29. It has.

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

  A manufacturing method of a pneumatic tire according to an embodiment of the present invention is a manufacturing method for manufacturing a pneumatic tire 1 in which a rubber patch 25 is attached to a surface of an inner liner 23 from a raw tire 1 ′. Thus, it includes a patch setting process, a spacer setting process, a vulcanization process, a spacer removal process, and an electronic device mounting process (transponder mounting process). The raw tire 1 ′ refers to an unvulcanized tire before being completed as the pneumatic tire 1.

Patch Setting Step As shown in FIGS. 1A and 1B, a rubber patch 25 made of a vulcanized rubber material is prepared, and the rubber patch 25 is attached to the surface of the inner liner 23 in the raw tire 1 ′. Thereby, the rubber patch 25 can be set to the inner liner 23 in the raw tire 1 ′.

Spacer setting process After the patch setting process is completed, as shown in FIGS. 2A, 2B and 4A, a circular sheet-like spacer 31 made of a vulcanized rubber material is prepared. The rubber patch is accommodated in the accommodating recess 33 formed in 31 and the spacer 31 overlaps from one edge of the tire 13 in the tire width direction W of the belt 13 to the other edge when viewed from the front side of the spacer 31. Thus, the spacer 31 is affixed on the surface of the inner liner 23 in the raw tire 1 ′. Thereby, the circular sheet-like spacer 31 can be set on the inner liner 23 in the raw tire 1 ′.

  Here, the rubber material composing the spacer 31 is the same material as the bladder described later (specifically, butyl rubber or chloroprene rubber). The accommodation recess 33 of the spacer 31 has a shape similar to the transponder body 29, and the depth of the accommodation recess 33 of the spacer 31 is substantially the same as the thickness of the transponder body 29. Furthermore, as shown in FIG. 3, the angle formed between the front surface and the back surface on the peripheral side of the spacer 31 (in other words, the angle formed between the front surface on the peripheral side of the spacer 31 and the surface of the inner liner 23 in the raw tire 1 ′). θ is 10 degrees or less.

  As shown in FIG. 4A, instead of attaching a circular sheet-like spacer 31 to the surface of the inner liner 23 in the raw tire 1 ′, a belt-like spacer 31 is annularly attached to the surface of the inner liner 23 in the raw tire 1 ′. You may make it stick to.

Vulcanization Step After the spacer setting step is completed, the raw tire 1 ′ is set in the vulcanization die 35 using the vulcanization die 35. Then, as shown in FIG. 5, the raw tire 1 ′ is vulcanized in the vulcanization mold 35 while being pressurized from the inside of the raw tire 1 ′ by the bladder 37. Thus, the green tire 1 ′ can be molded into a predetermined product shape, and the rubber patch 25 can be bonded to the surface of the inner liner 23 by a crosslinking reaction.

  Here, since the rubber material which comprises the spacer 31 is the same material of the bladder 37, the spacer 31 tends to follow a deformation | transformation of the raw tire 1, and the spacer 31 may peel from the surface of the inner liner 23 in raw green 1 '. Absent.

  The vulcanization mold 35 includes an annular lower mold 39 provided on a fixed frame (not shown) in the vulcanizer and capable of mainly molding one sidewall portion 21 and one bead portion 5; The upper mold 41 is provided on an elevating frame (not shown) capable of raising and lowering, and can mainly mold the other sidewall portion 21 and the other bead portion 5, and the lower mold 39 and mainly the tread portion 17 can be molded. And an annular sector mold 43.

Spacer Removal Process After the vulcanization process is completed, the pneumatic tire 1 is removed from the vulcanization mold 35 and the spacer 31 is removed from the inner liner 23 as shown in FIG.

Electronic device mounting process (transponder mounting process)
After the spacer removal step is completed, as shown in FIG. 7, the transponder 27 is attached to the surface of the rubber patch 25 by bonding with an adhesive such as cyanoacrylate.

  Thus, the production of the pneumatic tire 1 provided with the rubber patch 25 is completed.

  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. In this case, in the patch setting step, the rubber patch 25 is attached to the surface of the inner liner 23 of the raw tire 1 ′ so that the rubber patch 25 is accommodated in the accommodating recess 33 of the spacer 31.

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

  Before the raw tire 1 ′ is vulcanized, the spacer 31 is set on the inner liner 23 of the raw tire 1 ′ under the condition that the rubber patch 25 is received in the receiving recess 33 of the spacer 31. The force that the rubber patch 25 receives intensively from the bladder 37 when vulcanizing 1 ′ can be shared and received by the spacer 31. Thereby, when the raw tire 1 ′ is vulcanized, the pressure acting locally around the rubber patch 25 in the inner liner 23 can be relieved, and the rubber patch 25 can be prevented from sinking into the surface of the inner liner 23. In particular, since the angle θ between the front surface and the back surface on the peripheral side of the spacer 31 is 10 degrees or less, the pressure acting locally around the rubber patch 25 in the inner liner 23 can be further relaxed.

  Therefore, according to the embodiment of the present invention, after the pneumatic tire 1 is manufactured, the steel cord 15 of the belt 13 that is a constituent member of the pneumatic tire 1 does not remain locally deformed, and the pneumatic tire 1 The original tire performance can be fully exhibited.

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

  Pneumatic tire 1 as an inventive product is manufactured by the manufacturing method of a pneumatic tire according to an embodiment of the present invention, and the pneumatic tire as a comparative product is manufactured by the manufacturing method of a pneumatic tire according to a comparative example in which the spacer setting step is omitted. 1 is manufactured. And when RRO (radial run-out) was investigated about the invention product and the comparison product, it was confirmed that the RRO of the invention product was lower than the RRO of the comparison product.

Fig.1 (a) is a figure explaining the patch 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 explaining the spacer 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.2 (a) from the top. . It is an enlarged view of the spacer which concerns on embodiment of this invention. Fig. 4 (a) is a side view of a green tire with a sheet-like spacer pasted on the inner liner surface, and Fig. 4 (b) is a raw tire with a strip-like spacer pasted on the inner liner surface in an annular shape. It is a side view of a tire. It is a figure explaining the vulcanization process in the manufacturing method of the pneumatic tire concerning the embodiment of the present invention. It is a figure explaining the spacer removal process in the manufacturing method of the pneumatic tire concerning the embodiment of the present invention. It is a figure explaining the electronic device attachment process in the manufacturing method of the pneumatic tire concerning the embodiment of the present invention. 1 is a partial cross-sectional view of a pneumatic tire according to an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pneumatic tire 1 'Raw tire 13 Belt 15 Steel cord 23 Inner liner 25 Rubber patch 27 Transponder 29 Transponder main body 31 Spacer 33 Accommodating recess 35 Vulcanization mold 37 Bladder

Claims (5)

A pneumatic tire manufacturing method for manufacturing a pneumatic tire having a rubber patch attached to a surface of an inner liner from a raw tire,
A patch setting step of attaching the rubber patch to the surface of the inner liner in the raw tire and setting the inner patch in the raw tire;
After the patch setting step is completed, the spacer is attached to the surface of the inner liner in the raw tire so that the rubber patch is accommodated in an accommodation recess formed in the spacer, and the inner liner in the raw tire is A spacer setting step for setting to
After the spacer setting step is completed, the raw tire is vulcanized while being pressurized from the inside of the raw tire by a bladder, thereby forming the raw tire into a predetermined product shape, and the rubber patch is attached to the inner liner. A vulcanization process to adhere to the surface of the resin by a crosslinking reaction;
After the vulcanization step is completed, a spacer removal step of removing the spacer from the inner liner,
A pneumatic tire manufacturing method comprising: an electronic device attaching step of attaching an electronic device to a surface of the rubber patch after the spacer removing step is completed . The spacer is in the form of a sheet,
2. The pneumatic tire according to claim 1, wherein in the spacer setting step, the sheet-like spacer is attached to a surface of the inner liner in the green tire and is set on the inner liner in the green tire. Production method. The belt is provided in the crown region of the carcass in the raw tire, and is formed by coating a number of steel cords extending in a direction inclined in the tire circumferential direction with rubber.
In the spacer setting step, the as the spacer when viewed from the front side of the spacer to overlap toward the other edge from one edge of the tire width direction of the belt in the raw tire, wherein the spacer in the raw tire adhering to the surface of the innerliner, the manufacturing method of the pneumatic tire according to claim 1 or 2, characterized in that set on the inner liner in the raw tire. The method for producing a pneumatic tire according to claim 3 , wherein an angle formed between the front surface and the back surface on the peripheral side of the spacer is 10 degrees or less. The method for manufacturing a pneumatic tire according to claim 3 , wherein the rubber material is made of the same material as the bladder.

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