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Method for making run-flat tire and assembly drum device for same

A runflat and manufacturing method technology, applied to the reinforcement layer of pneumatic tires, tire parts, transportation and packaging, etc., can solve the problems of carcass ply pasting position dislocation, uneven length, tire uniformity deterioration, etc. Achieve the effect of improving the paste accuracy, improving the uniformity, and improving the paste

Active Publication Date: 2010-03-03
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such winding is easy to dislocate the sticking position of the carcass cord 37
As a result, the length of the carcass cords extending in the region k between the bead cores 35, 35 (hereinafter sometimes simply referred to as "carcass cord path") becomes uneven, which deteriorates the uniformity of the tire. The problem

Method used

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  • Method for making run-flat tire and assembly drum device for same
  • Method for making run-flat tire and assembly drum device for same
  • Method for making run-flat tire and assembly drum device for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0077] With the method of the present invention ( Image 6 and Figure 7 process) and previous methods ( Figure 11 ) respectively trial-manufacture green tire substrates for run-flat tires, and then use the same process to finalize the green tires to shape various run-flat tires (size 265 / 50R20). In addition, for comparison, a molding method (comparative example) in which a pair of circumferential grooves were initially formed on the outer peripheral surface of the drum main body, and inner liner rubber, sidewall reinforcing rubber, and Carcass ply is used to form the method of green tire matrix. Also, they were tested for uniformity.

[0078] For uniformity, the radial force variation (RFV) and the lateral force variation (LFV) were measured for 30 run-flat tires using a uniformity testing machine, and the average value and standard deviation were obtained. Here, RFV and LFV are measured in accordance with JASO C607 (Test method for uniformity of automobile tires).

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Abstract

The invention can improve the homogeneity of a run-flat tire. A method for making the run-flat tire of which a tire side part is provided with a tire side reinforcing glue with the cross section approximately in the crescent shape is provided. The method includes: winding flaky inner lining glue on the external circumstance of a cylindrical drum main body; winding and sticking band-shaped tire side reinforcing glue in the region of the external circumstance of the cylindrical inner lining glue equivalent to a pair of tire sides to form a first cylindrical object; arranging a pair of circumferential channels on the external circumstance of the drum main body and the inner side of the tire side reinforcing glue, expanding the drum main body, thereby the portion of the first cylindrical object, reinforced with the tire side reinforcing glue goes down into the circumferential channels; and winding the flaky carcass cord fabric by means of the external circumstance of the sinking and flat first cylindrical object to form a basal body of the tire.

Description

technical field [0001] The present invention relates to a method of manufacturing a run flat tire capable of improving uniformity and a building drum device used in the method. Background technique [0002] A previously known Figure 10 A run flat tire 31 is shown. This runflat tire 31 is provided with a tread portion 32, a pair of sidewall portions 33 extending inwardly in the tire radial direction from both sides of the tread portion 32, and a bead core 35 provided at an inner end of each sidewall portion 33 and embedded therein. The bead portion 34. [0003] In addition, the run-flat tire 31 includes: a carcass 36 formed of at least one carcass ply extending annularly between bead cores 35; an inner liner 38 arranged inside the carcass 36; 36 and the inner liner 38 and disposed on each sidewall portion 33 is a sidewall reinforcing rubber 39 having a cross-section approximately crescent-shaped. [0004] This kind of run-flat tire 31 can increase the rigidity of each sid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D30/30B29D30/24B29D30/26B60C9/02
CPCB29D30/24B29D2030/201
Inventor 面川寿彦
Owner SUMITOMO RUBBER IND LTD
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