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Rigidity reinforcement ring and tire vulcanizing method using same

A tire vulcanization and reinforcing ring technology, applied in tire parts, tires, applications, etc., can solve the problems of insufficient tire inner surface shape and dimensional accuracy, tire shape restrictions, difficult to remove tires, etc., and achieve low-cost and stable dimensional accuracy , Improve the design freedom, improve the effect of dimensional accuracy

Inactive Publication Date: 2017-03-08
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the vulcanization method using a rigid core has the following problems: it is difficult to cope with the thermal expansion of the tire during vulcanization, and the applicable tire shape is limited; it is difficult to remove the vulcanized tire from the inner mold, and the productivity is low; manufacturing cost high
[0005] However, in the bladderless vulcanization process, there are problems that the thicker area of ​​the green tire cannot be sufficiently pressed to the metal mold, so that the applicable tire shape is limited; and the inner surface shape and dimensional accuracy of the vulcanized tire are insufficient

Method used

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  • Rigidity reinforcement ring and tire vulcanizing method using same
  • Rigidity reinforcement ring and tire vulcanizing method using same
  • Rigidity reinforcement ring and tire vulcanizing method using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0114] When manufacturing a raw tire of the same specification (tire size 205 / 55R16), the rigid reinforcement ring was used for vulcanization molding in Examples 1 to 4, and the rigid reinforcement ring was not used in Comparative Example 1. In addition, as a rigid reinforcing ring, polyester fiber cords (total fineness 2200 dtex, cords with a twist structure of 46×46 (2 twisted)) wound spirally in the tire circumferential direction at 50 cords / 50mm were used. , and a vulcanized cylindrical ring (diameter 570 mm, thickness t=2.3 mm) was covered with butyl rubber. In addition, in Example 1, the rigid reinforcement ring which does not have a tapered part was used, and in Examples 2-4, the rigid reinforcement ring which has the tapered part of the dimension shown in Table 1 was used. The distance L from the outer end of the taper to the inner end and the thickness te of the outer end of the stiffening rings used in Examples 2, 3, and 4 were different as shown in Table 1. In addi...

Embodiment 5、6

[0124] When manufacturing pneumatic tires (tire size 205 / 55R16) of the same specification, in Comparative Examples 2 and 3, vulcanization molding was performed by airbag surface processing or using a rigid core, and in Examples 5 and 6, vulcanization molding was performed using a rigid reinforcing ring, Pneumatic tires of Examples 5 and 6 and Comparative Examples 2 and 3 were produced.

[0125] In addition, in the rigid reinforcing ring of embodiment 5, such as Figure 5 As shown, no inclined surfaces are provided at both ends of the rigid reinforcement ring. In the rigid reinforcing ring of embodiment 6, such as Figure 6 As shown, in the step difference between the thick wall part and the thin wall part whose thickness changes according to the depth of the concave part of the rigid reinforcement ring, an inclined surface is provided on the surface contacting the vulcanization bladder, and at the same time, the both ends of the rigid reinforcement ring In order to gradually...

Embodiment 7

[0136] When manufacturing the raw tire (tire size 205 / 55R16) of the same specification, in embodiment 7, use Figure 13 The stiffening rings shown were vulcanized without bladders, and no stiffening rings were used in Comparative Example 4. In addition, as the rigid reinforcing ring, a ring that is in contact with the entire inner surface corresponding to the region from the tread portion to the bead portion, that is, a polyester fiber cord (total fineness 2200 dtex, twisted structure: 46×46 (2 cords) is used. Twisted) cords) were spirally wound in the tire circumferential direction at 50 cords / 50 mm, and a cylindrical ring (diameter 570 mm, thickness 2.3 mm) was vulcanized by covering with natural rubber.

[0137] The inner surface shapes of the pneumatic tires obtained by vulcanization without bladders in Example 7 and Comparative Example 4 were visually observed. The tire inner surface shape of the pneumatic tire obtained in Example 7 was good, and the shape of the grooves...

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Abstract

Provided is a pneumatic tire vulcanizing method which allows increase of the dimensional accuracy for a pneumatic tire and, at the same time, prevents decrease of productivity and of the degree of freedom in designing. This tire vulcanizing method, in which a green tire T is set in a mold 1, a bladder 2 is inserted inside of the green tire T and is expanded to press the bladder 2 in the tire-radially outward direction, and vulcanization-molding is performed, is characterized in that the bladder 2 is expanded with a rigidity reinforcement ring 3 interposed between the inner circumferential face of the region corresponding to the tread portion of the green tire T and the outer circumferential face of the region corresponding to the tread portion of the bladder 2.

Description

technical field [0001] The present invention relates to an annular member used for vulcanization molding of a pneumatic tire and a tire vulcanization method using the annular member. Background technique [0002] As a method of vulcanizing and molding a pneumatic tire, after setting a green tire inside a metal mold, inserting a vulcanizing bladder inside the green tire, injecting or filling steam, etc. to expand it, pressurizing and heating the green tire are more common. many. However, in vulcanization molding using a vulcanization bladder, components of the pneumatic tire may flow and may not be arranged as designed. In this case, there is a problem that the expected tire performance cannot be exhibited. In addition, in order to manufacture high-performance pneumatic tires, it is necessary to further improve the arrangement accuracy of tire constituent members. [0003] In order to improve the dimensional accuracy of pneumatic tires and improve tire performance, a vulca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C33/02B29C35/02B29L30/00
CPCB29D30/0654B29D30/0662B29D2030/0659B60C5/08B60C99/00
Inventor 佐藤元山村健太
Owner THE YOKOHAMA RUBBER CO LTD
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