JP6153845B2 - Tire molding drum sleeve, tire molding apparatus, and tire molding method - Google Patents

Description

  The present invention relates to a tire molding drum sleeve, a tire molding device, and a tire molding method.

  In the molding of a tire, a member around a bead such as a steel chafer is pasted on an inner liner on a tire molding drum, and a carcass ply is pasted thereon. Then, so-called stitching is performed in which the carcass ply is pressed from above with a roller. Stitching is performed for the purpose of bringing the attached members into close contact and removing air between the members. Thereafter, the bead is set above the members around the bead, and turn-up and shaping are performed to complete a so-called green case.

  In such molding, tire constituent members such as members around the beads are stacked in layers where the beads are set, so that air easily accumulates between these members. Furthermore, when a tire constituent member is laminated on a cylindrical tire molding drum, the place where the bead is set rises more than other places. Therefore, in stitching, the roller cannot press the carcass ply in accordance with the raised shape, and air bleeding becomes insufficient.

  In order to solve this problem, in the invention of Patent Document 1, the surface of the drum is formed by a large number of plates divided in the drum circumferential direction and the axial direction, and each plate can be displaced in the drum radial direction. The plate of the portion where the plurality of tire constituent members are stacked is displaced inward in the drum radial direction when stacked, thereby preventing the stacked body from rising to the outside of the drum.

  However, such a drum has a complicated structure and is not preferable from the viewpoints of equipment cost and maintenance. Moreover, since a level | step difference arises between plates, a level | step difference arises in the tire structural member affixed on this, and air tends to accumulate in the level | step-difference part.

Japanese Patent Laid-Open No. 2007-62083

  The problem to be solved by the embodiments of the present invention is to provide a tire molding drum sleeve, a tire molding apparatus, and a tire molding method in which air hardly remains between laminated tire constituent members.

The sleeve for a tire molding drum of the embodiment is a cylindrical tire molding drum sleeve that is covered with a tire molding drum and laminated with a tire constituent member on an outer diameter side thereof, and has an inner diameter that is constant in the axial direction. An outer diameter at both axial end portions is formed to be smaller than an outer diameter at the axial central portion, and a portion where the outer diameter changes between the axial end portions and the axial central portion in the sleeve axial direction is The member around the bead, which is a part of the tire constituent member, is a portion where it is laminated.

  According to the embodiments of the present invention, it is possible to provide a tire molding drum sleeve, a tire molding apparatus, and a tire molding method in which air hardly remains between laminated tire constituent members.

The side view of the tire molding device of an embodiment. The fragmentary sectional view of the sleeve for tire forming drums of an embodiment. Sectional drawing of the tire structural member laminated | stacked on the sleeve for tire shaping | molding drums of embodiment. Sectional drawing of the sleeve for tire molding drums of the example 1 of a change. Sectional drawing of the sleeve for tire molding drums of the example 2 of a change.

(1) Structure of tire molding device and tire molding drum sleeve 2 FIG. 1 shows a tire molding device according to an embodiment.

  The tire molding apparatus according to the embodiment includes a tire molding drum 1 and is provided with a known moving device for moving a predetermined route in a factory, other devices, and the like as necessary. .

  The tire molding drum 1 of the embodiment has a known structure, and a plurality of metal plates 10 are arranged in a circumferential shape and can advance and retreat in the radial direction. As necessary, the plate 10 advances and retreats in the radial direction, and the diameter of the tire molding drum 1 expands and contracts.

  A part of the plate 10 is formed with a groove 11 that opens on the outer surface of the drum and extends in the drum axial direction. The tire molding drum sleeve 2 described below is attached to the tire molding drum 1 using the groove 11.

  The tire molding drum sleeve 2 of the embodiment is shown in FIG.

  The tire molding drum sleeve 2 is a member that covers the tire molding drum 1 at the time of tire molding. At the time of tire molding, tire constituent members such as the inner liner 4, members around the beads, and the carcass ply 42 are laminated on the upper surface. Its shape is cylindrical. The material is not limited, but it is desirable that the material can be expanded and contracted with the expansion and contraction of the drum, particularly rubber.

  The inner diameter side of the tire molding drum sleeve 2 has a cylindrical shape with no change in the inner diameter in the axial direction. On the other hand, the outer diameter side of the tire molding drum sleeve 2 is formed such that the outer diameter at the axial end portion 20 of the sleeve is smaller than the outer diameter at the axial central portion 21. And between the axial direction edge part 20 with a small outer diameter, and the axial direction center part 21 with a large outer diameter, it becomes the taper-shaped taper part 22 from which an outer diameter changes linearly along a sleeve axial direction. Yes.

  The tapered portion 22 is a portion where members around the bead that are a part of the tire constituent member are stacked. The members around the bead are tire constituent members other than the inner liner 4 and the carcass ply 42, and are members positioned on the outer side, the inner side, and the inner diameter side of the bead 44 after the turn-up. When the steel chafer 41 is stacked as a member around the bead, it is desirable that the range of the taper portion 22 in the sleeve axial direction includes the position of the inner end of the steel chafer 41 in the sleeve axial direction. Further, the carcass ply 42 is laminated on the outer diameter side of the steel chafer 41, and the end portion of the taper portion 22 on the outer side in the sleeve axial direction substantially coincides with the end portion of the carcass ply 42 on the outer side in the sleeve axial direction. In addition, it is desirable that the end portion of the carcass ply 42 is located on the inner side in the sleeve axial direction than the end portion on the outer side in the sleeve axial direction.

  The tire molding drum sleeve 2 is different for each type of tire to be molded. Specific values such as the width of the axial end 20, the axial central portion 21, and the tapered portion 22, the outer diameter of the axial end portion 20 and the axial central portion 21, and the taper angle of the tapered portion 22 are tire molding. Different for each drum sleeve 2.

  However, the length of the taper portion 22 in the sleeve axial direction is preferably 50 to 170 mm, and the height in the sleeve radial direction is preferably 3.5 to 8.5 mm.

  A metal bar 3 extending in the axial direction of the sleeve and fitting into the groove 11 is attached to a portion corresponding to the groove 11 of the tire molding drum 1 on the inner diameter side of the tire molding drum sleeve 2. The metal bar 3 is made of metal. The bolt is passed through the hole formed in the tire molding drum sleeve 2 from the outside of the sleeve and is tightened into the female screw hole formed in the metal bar 3 inside the sleeve, whereby the metal bar 3 is attached to the tire molding drum sleeve 2. ing.

  The tire molding drum sleeve 2 is attached to the tire molding drum 1 by inserting the metal bar 3 of the tire molding drum sleeve 2 into the groove 11 of the tire molding drum 1 from the drum axial direction.

(2) Tire Molding Method A tire molding method according to the embodiment will be described based on FIG.

  First, preparations for attaching tire constituent members are made. Specifically, first, the plate 10 is retracted inward in the drum radial direction so that the diameter of the tire molding drum 1 is minimized. Next, the tire molding drum sleeve 2 is attached to the tire molding drum 1 as described above. Next, the plate 10 advances outward in the drum radial direction so that the diameter of the tire molding drum 1 becomes a diameter suitable for attaching the tire constituent member.

  Next, a tire constituent member is affixed to the outer diameter side of the tire molding drum sleeve 2.

  First, the inner liner 4 is affixed so as to cover the entire axial center portion 21 and a part of the tapered portion 22.

  Next, the side member 40 is pasted from the portion corresponding to the outer diameter side of the tapered portion 22 on the inner liner 4 to the sleeve axial direction end portion 20. The side member 40 is affixed at two places on both sides in the sleeve axial direction. The side member 40 is a member integrated in advance so that the sidewall 40a is on the outer side in the sleeve axial direction and the rubber chafer 40b is on the inner side in the sleeve axial direction.

  Next, a steel chafer 41 as a member around the bead is attached on a part of the inner liner 4 and a part of the side member 40. The inner end of the steel chafer 41 in the sleeve axial direction is on the inner liner 4 and within the range of the tapered portion 22 in the sleeve axial direction, more specifically, from the boundary between the axial central portion 21 and the tapered portion 22. Is slightly attached to the position on the taper portion 22 side. Further, the end portion on the inner side in the sleeve axial direction of the steel chafer 41 is located on the inner side in the sleeve axial direction with respect to the end portion on the inner side in the sleeve axial direction of the side member 40. The steel chafer 41 is affixed at two locations on both sides in the sleeve axial direction.

  Next, the carcass ply 42 is attached so as to cover the inner liner 4 and the steel chafer 41. The end portion of the carcass ply 42 in the sleeve axial direction outside is a position substantially coincident with the boundary between the tapered portion 22 and the axial end portion 20 of the tire molding drum sleeve 2 or a position closer to the axial end portion 20 side than the boundary. Is pasted.

  Thus, the pasting of the tire constituent member before the stitching is completed.

  In addition to the above-described tire constituent members, pads, tapes, and other tire constituent members are attached between the members as necessary. Such tire constituent members include members around the bead.

  Next, stitches are performed from above the laminated tire constituent members by a known stitcher having a roller.

  Next, a belt lower pad (not shown) is attached to the upper portion of the carcass ply 42 and in the vicinity of both end portions of the axial center portion 21, and stitching is further performed thereon.

  Thereafter, the bead 44 is set above the steel chafer 41, and turn-up and shaping are performed to complete the green case.

  The completed green case is sent to the next process, where belts and treads are pasted and vulcanized to complete the tire.

(3) Effect According to the above embodiment, it is difficult for air to accumulate between the laminated tire constituent members. More specifically, a member around the bead such as the steel chafer 41 is attached to the outer diameter side of the taper portion 22 and the axial end portion 20 of the tire molding drum sleeve 2 during tire molding. That is, more tire components are stacked on the tapered portion 22 and the axial end portion 20 than on the axial central portion 21. However, the outer diameter of the tapered portion 22 and the axial end portion 20 of the tire molding drum sleeve 2 is smaller than the outer diameter of the axial central portion 21. For this reason, the outer diameter side portion of the taper portion 22 and the axial end portion 20 of the carcass ply 42 affixed to the outermost diameter side does not rise larger than the axial center portion 21. Therefore, in stitching, the roller can press the carcass ply 42 along its surface. As a result, air bleeding is sufficiently performed, and air is prevented from remaining between the stacked tire constituent members.

  Here, as shown in FIG. 3, the laminated body of the tire constituent members is thicker on the outer side in the sleeve axial direction than the end portion on the inner side in the sleeve axial direction of the steel chafer 41. In the vicinity of the end portion of the carcass ply 42 in the sleeve axial direction, the thickness becomes the largest.

  In the above embodiment, the end portion on the inner side in the sleeve axial direction of the steel chafer 41 is attached at a position closer to the tapered portion 22 than the boundary between the axial central portion 21 and the tapered portion 22 of the tire molding drum sleeve 2. Attached. Therefore, the thick part of the laminated body of the tire constituent members on the outer side in the sleeve axial direction than the end on the inner side in the sleeve axial direction of the steel chafer 41 is attached to the tapered portion 22 and the axial end 20 having a small outer diameter. Will be attached. Therefore, the carcass ply 42 affixed to the outermost diameter side of the laminate of tire constituent members does not rise significantly on the outer diameter side.

  Further, in the above-described embodiment, the end portion of the carcass ply 42 in the sleeve axial direction outer side is at a position substantially coincident with the boundary between the taper portion 22 and the axial end portion 20 of the tire molding drum sleeve 2 or more than the boundary. Affixed at a position on the axial end 20 side. Therefore, the thickest part of the laminated body of tire constituent members is attached to the part having the smallest outer diameter of the tire molding drum sleeve 2 or the vicinity thereof. Therefore, the thickest part of the laminate of tire constituent members does not protrude radially outward. Therefore, when the laminated body of the tire constituent member is passed through the ring-shaped bead for the bead setting, a portion protruding radially outward of the laminated body of the tire constituent member does not hit the bead.

  Further, the tire molding drum sleeve 2 is cylindrical on the inner diameter side and has a characteristic shape on the outer diameter side, so the tire molding method described above can be carried out simply by attaching it to a conventional cylindrical drum. can do. Further, the shape of the outer diameter side of the tire molding drum sleeve 2 can be varied according to the type of tire to be molded. When changing the type of tire to be molded, the tire molding drum sleeve 2 can be easily replaced.

  Moreover, since the height in the sleeve radial direction of the taper portion 22 of the tire molding drum sleeve 2 is 3.5 to 8.5 mm, the tire can be molded without causing a problem. Specifically, when the height in the sleeve radial direction is lower than 3.5 mm, the laminated portion of the steel chafer 41 of the laminate of tire constituent members rises outward in the sleeve radial direction, and the stitches are insufficient. Cause. Also, if the height in the sleeve radial direction is higher than 8.5 mm, the outer diameter of the portion attached to the tapered portion 22 of the laminated body of the tire constituent members becomes small. There is a possibility that the beads arranged on the outer diameter side do not reach the laminated body, and the laminated body and the beads cannot be brought into contact with each other.

(4) Example (4-1) Example 1
In addition to the inner diameter side as well as the outer diameter side, the carcass ply 42 is laminated on the cylindrical sleeve (laminate 1) and the carcass ply 42 is laminated on the tire molding drum sleeve 2 of the above embodiment. (Stacked body 2) was prepared. Then, the stitcher was moved in the axial direction of the sleeve while being applied to the carcass ply 42, and the change in the contact pressure between the stitcher and the carcass ply 42 was measured.

  As a result of the measurement of the laminate 1, the difference between the maximum value and the minimum value of the contact pressure was 2.325 MPa. On the other hand, as a result of measurement of the laminate 2, the difference between the maximum value and the minimum value of the contact pressure was 2.267 MPa. Thus, it turned out that the value of the laminated body 2 is smaller than the result of the laminated body 1.

  From this, it was confirmed that the stitcher was able to press the carcass ply 42 with a uniform force when stitching to the laminate 2 rather than the laminate 1. Therefore, it is considered that the laminate 2 is less likely to leave air between the tire constituent members. Further, it was also confirmed that the carcass ply 42 was adhered to the laminated body 2 more flatly than the laminated body 1.

(4-2) Example 2
Using the following three tire molding apparatuses, a laminate of tire constituent members was manufactured, and the occurrence rates of defects due to air remaining between the tire constituent members were compared.

  The first tire molding apparatus (the tire molding apparatus of Comparative Example 1) includes a cylindrical drum. The drum of Comparative Example 1 is covered with a cylindrical sleeve having no change in outer diameter in the axial direction. The second tire molding apparatus (tire molding apparatus of Comparative Example 2) includes a drum whose outer peripheral surface is divided into a large number of plates in the drum circumferential direction and the axial direction, as in the drum of Patent Document 1. The drum of Comparative Example 2 is in a state in which the plate at the center in the drum axis direction protrudes more outward than the plates at both ends in the drum axis direction. The sleeve of Comparative Example 2 is not covered with a sleeve. The third tire molding apparatus is the tire molding apparatus according to the above embodiment.

  As a result, the failure occurrence rate when using the tire molding device of the above embodiment was half of the failure occurrence rate when using the tire molding device of Comparative Example 1. Further, when the tire molding apparatus of Comparative Example 2 was used, the defect occurrence rate was much higher than when the tire molding apparatus of Comparative Example 1 was used, and most of the laminates of tire constituent members were defective.

  Therefore, when a tire component is laminated on the tire molding drum sleeve 2 of the above embodiment, the tire configuration is formed on a cylindrical sleeve having no change in the outer diameter in the axial direction or on the drum of Patent Document 1. It was confirmed that air was less likely to remain between the tire constituent members than when the members were laminated.

(5) Modification example (5-1) Modification example 1
The tire molding drum sleeve 5 of the first modification is shown in FIG.

  Similar to the tire molding drum sleeve 2 described above, the tire molding drum sleeve 5 includes an axial center portion 51, a tapered portion 52, and both axial end portions 50. However, the taper portion 52 is different in that it includes a first taper portion 52a which is a tapered portion on the axial center portion 51 side and a second taper portion 52b which is a tapered portion on both axial end portions. . The difference between the first taper portion 52a and the second taper portion 52b is the difference in taper angle with respect to the inner diameter surface of the sleeve 5 for tire molding drum. The taper angle of the first taper portion 52a is the taper of the second taper portion 52b. Greater than angle.

  Here, as in the case of the tire molding drum sleeve 2 described above, the range of the taper portion 52 in the sleeve axial direction includes the position of the inner end portion of the steel chafer 41 in the sleeve axial direction. In particular, in the taper portion 52, it is desirable that the range of the first taper portion 52 a in the sleeve axial direction includes the position of the end portion of the steel chafer 41 in the sleeve axial direction. Further, the end portion of the second taper portion 52b on the outer side in the sleeve axial direction substantially coincides with the end portion on the outer side in the sleeve axial direction of the carcass ply 42, or the end portion of the carcass ply 42 in the sleeve axial direction. It is desirable to be inside.

  In the tire molding drum sleeve 5, since the taper angle of the first taper portion 52a is large, the outer diameter suddenly decreases from the end of the axial center portion 51 to the taper portion 52. Therefore, as compared with the tire molding drum sleeve 2 of the above-described embodiment, even if more tire constituent members are laminated on the outer diameter side of the tapered portion 52, they are stuck on the tapered portion of the laminated body of the tire constituent members. The part to be attached does not protrude outward in the radial direction of the sleeve.

  Moreover, when the taper angle of the whole taper part 52 is large, the outer diameter part of the taper part 52 in the end part direction on the outer side in the sleeve axial direction and the axially opposite end parts 50 continuous therefrom are very small. In that case, the outer diameter of the axial direction both ends of the laminated body of tire constituent members becomes very small. Then, in the case of bead setting, the problem that the part by the side of the outer diameter of the laminated body of a tire structural member does not contact | abut to a bead arises. However, in this modified example, since the taper angle of the second taper portion 52b is small and the outer diameters of the second taper portion 52b and the axial end portions 50 are not too small, such a problem does not occur.

(5-2) Modification 2
A tire molding drum sleeve 6 according to Modification 2 is shown in FIG.

  Similar to the tire molding drum sleeve 2 described above, the tire molding drum sleeve 6 includes an axial center portion 61, a tapered portion 62, and both axial end portions 60. However, the difference is that a concave portion 63 having an outer diameter smaller than that of the surrounding portion is formed between the tapered portion 62 and both axial end portions 60.

  Here, as in the case of the tire molding drum sleeve 2 described above, the range of the taper portion 62 in the sleeve axial direction includes the position of the inner end of the steel chafer 41 in the sleeve axial direction. The concave portion 63 is formed so that the end portion of the carcass ply 42 to be attached on the outer side in the sleeve axial direction is positioned within the range in the sleeve axial direction.

  When molding is performed using the tire molding drum sleeve 6, a portion of the laminated body of the tire constituent members having an end portion on the outer side in the sleeve axial direction of the carcass ply 42 where the thickness is maximum is outside the recess 63. Affixed to the diameter side. For this reason, the portion of the laminated body of the tire constituent members that has the end portion on the outer side in the sleeve axial direction of the carcass ply 42 does not protrude outward in the radial direction. Therefore, the stitch and bead setting are not hindered.

(5-3) Other Modifications Types of tire constituent members stacked on the tire molding drum sleeve, positional relationship between the tire constituent members, and the boundary between the axial center of the tire molding drum sleeve and the taper portion The positional relationship between the end of the tire constituent member and the positional relationship between the tapered portion of the tire molding drum sleeve and the boundary between the axial end portions and the end of the tire constituent member are not limited to those described above.

DESCRIPTION OF SYMBOLS 1 ... Tire molding drum, 10 ... Plate, 11 ... Groove, 2 ... Tire molding drum sleeve, 20 ... Axial end part, 21 ... Axial center part, 22 ... Tapered part, 3 ... Metal bar, 4 ... Inner liner, 40 ... Side member, 40a ... Side wall, 40b ... Rubber chafer, 41 ... Steel chafer, 42 ... Carcass ply, 44 ... Bead, 5 ... Modified tire molding drum sleeve, 50 ... Both axial ends, 51 ... Axial center part, 52 ... Taper part, 52a ... First taper part, 52b ... Second taper part, 6 ... Sleeve for drum of another example, 60 ... Axial end parts, 61 ... Axial center Part, 62 ... taper part, 63 ... concave part

Claims (15)

A cylindrical tire molding drum sleeve that is covered with a tire molding drum and in which tire components are laminated on the outer diameter side thereof,
The inner diameter is constant in the axial direction , and the outer diameter at both axial end portions is smaller than the outer diameter at the axial central portion,
The portion where the outer diameter changes along the sleeve axial direction between the axial end portions and the axial central portion is a portion where members around the bead that are a part of the tire constituent member are laminated. Sleeve for tire molding drum. As the tire constituent member, at least an inner liner, a side member disposed on the outer side in the sleeve axial direction from a part on both sides in the sleeve axial direction of the inner liner, and an outer diameter of at least a part of each of the inner liner and the side member A tire molding drum sleeve in which a steel chafer as a member around the bead arranged on the side, and at least the inner liner and a carcass ply arranged on the outer diameter side of the steel chafer are laminated,
2. The tire molding drum sleeve according to claim 1, wherein a range in the sleeve axial direction of a portion where the outer diameter changes along the sleeve axial direction includes a position of an end portion on the inner side in the sleeve axial direction of the steel chafer.   3. The tire according to claim 2, wherein an end portion on the outer side in the sleeve axial direction of a portion whose outer diameter changes along the sleeve axial direction is located on the inner side in the sleeve axial direction with respect to an outer end portion in the sleeve axial direction of the carcass ply. Sleeve for molding drum.   The tire molding drum according to any one of claims 1 to 3, wherein a portion between the axial end portions and the axial central portion where the outer diameter changes along the sleeve axial direction is tapered. sleeve.   A portion between the axial end portions and the axial central portion where the outer diameter changes along the sleeve axial direction is a first tapered portion that is a tapered portion on the axial central portion side, and the first And a taper angle of the first taper portion with respect to the inner diameter surface of the tire molding drum sleeve is the same taper angle of the second taper portion. The sleeve for a tire molding drum according to any one of claims 1 to 3, wherein the sleeve is larger. A recess between the both ends in the axial direction and the central portion in the axial direction at the outer side in the sleeve axial direction of the portion where the outer diameter changes along the sleeve axial direction has a smaller outer diameter than the surrounding portion. Formed,
3. The tire molding drum sleeve according to claim 2, wherein a range of the concave portion in the sleeve axial direction includes a position of an outer end portion of the carcass ply in the sleeve axial direction. A tire molding apparatus comprising: a cylindrical tire molding drum; and a cylindrical tire molding drum sleeve that is covered only on the tire molding drum and on which a tire constituent member is laminated.
The tire molding drum sleeve is formed such that the inner diameter is constant in the axial direction , and the outer diameter at both axial end portions is smaller than the outer diameter at the axial central portion,
The portion where the outer diameter changes along the sleeve axial direction between the axial end portions and the axial central portion is a portion where members around the bead that are a part of the tire constituent member are laminated. Tire molding device. On the outer diameter side of the tire molding drum sleeve, at least an inner liner, a side member disposed on the outer side in the sleeve axial direction from a part of both sides in the sleeve axial direction of the inner liner, the inner liner and the side member A tire molding device in which a steel chafer as a member around the bead disposed on at least a part of the outer diameter side and at least the inner liner and a carcass ply disposed on the outer diameter side of the steel chafer are laminated. Because
The range in the sleeve axial direction of the portion of the tire molding drum sleeve that is covered with the tire molding drum, the outer diameter of which changes along the sleeve axial direction, is the inner end in the sleeve axial direction of the steel chafer. The tire shaping | molding apparatus of Claim 7 containing the position of a part.   The end portion of the tire molding drum sleeve, which is covered with the tire molding drum, has a portion whose outer diameter changes along the sleeve axial direction. The tire molding device according to claim 8, which is located on the inner side in the sleeve axial direction from the end portion.   The tire molding device according to any one of claims 7 to 9, wherein a portion between the axial end portions and the axial central portion where the outer diameter changes along the sleeve axial direction is tapered.   A portion between the axial end portions and the axial central portion where the outer diameter changes along the sleeve axial direction is a first tapered portion that is a tapered portion on the axial central portion side, and the first And a taper angle of the first taper portion with respect to the inner diameter surface of the tire molding drum sleeve is the same taper angle of the second taper portion. The tire molding device according to any one of claims 7 to 9, wherein the tire molding device is larger. A recess between the both ends in the axial direction and the central portion in the axial direction at the outer side in the sleeve axial direction of the portion where the outer diameter changes along the sleeve axial direction has a smaller outer diameter than the surrounding portion. Formed,
The tire molding device according to claim 8, wherein a range of the concave portion in the sleeve axial direction includes a position of an end portion of the carcass ply on the outer side in the sleeve axial direction. Placed over only the tire building drum of cylindrical, inner diameter is constant in the axial direction, smaller than the outer diameter outer diameter in the axial center portion in the axial end portion, on the outer diameter side of the sleeve for a tire building drum, A tire molding method for laminating tire constituent members,
A tire molding method comprising laminating a member around a bead, which is a part of the tire constituent member, at a portion between the axial end portions and the axial central portion where the outer diameter changes along the sleeve axial direction. At least an inner liner is affixed to the outer diameter side of the tire molding drum sleeve, and a side member is affixed to the outer side in the sleeve axial direction from a portion of both sides of the inner liner in the sleeve axial direction, and the inner liner and the side member A tire molding method in which a steel chafer as a member around the bead is affixed to at least a part of each outer diameter of each of the tires, and a carcass ply is laminated at least on the outer diameter side of the inner liner and the steel chafer,
The inner end of the steel chafer in the axial direction of the sleeve is affixed to a portion in the sleeve axial direction where the outer diameter of the sleeve for the tire molding drum that covers the tire molding drum varies along the axial direction of the sleeve. The tire molding method according to claim 13 attached. The outer diameter of the sleeve for the tire molding drum covered on the tire molding drum is outside the sleeve axial direction at the outer end of the sleeve axial direction of the portion where the outer diameter of the sleeve changes along the axial direction of the sleeve. The tire molding method according to claim 14, wherein the ends of the tire are attached.

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