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Method for manufacturing pneumatic tire

A technology for pneumatic tires and tires, applied in tire parts, tire treads/tread patterns, tires, etc., can solve problems such as deterioration, time-consuming, large steps, etc., to prevent deterioration, prevent molding defects, reduce effect of steps

Active Publication Date: 2008-11-19
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to improve the production efficiency of such rubber parts, it is preferable to use relatively thick rubber tapes, because if the rubber tapes are very thin, the tape needs to be wound many times, which is very time-consuming
[0004] However, if the rubber band is thicker, the step formed at the end of the rubber band will be larger accordingly
Therefore, tire uniformity (for example, RFV (Radial Force Fluctuation), RRO (Radial Runout)) is liable to deteriorate

Method used

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  • Method for manufacturing pneumatic tire
  • Method for manufacturing pneumatic tire
  • Method for manufacturing pneumatic tire

Examples

Experimental program
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Embodiment Construction

[0018] In the drawings, a pneumatic tire 1 according to the present invention includes: a tread portion 2; a pair of axially spaced bead portions 4 each having a bead core 5 therein; a pair of sidewall portions 3, which extends between the tread edge and the bead portion 4; the toroidal carcass 6, which extends between the bead portions 4 through the tread portion 2 and the sidewall portion 3; the belt layer 7, which sets In the tread portion 2, radially outside the carcass 6; and as figure 1 A number of different rubber parts G shown in.

[0019] The carcass 6 is composed of at least one ply 6A having cords arranged in a radial form at an angle ranging from 70 to 90 degrees with respect to the equator C of the tire, the carcass 6 passing between the bead portions 4 through the tread portions 2 and The sidewall portion 3 extends and turns up around the bead core 5 in each bead portion 4 from the axially inner side to the axially outer side of the tire, thereby forming a pair ...

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Abstract

A method for manufacturing a pneumatic tire with tread grooves comprises: building a green tire, and vulcanizing the green tire in a mold, wherein the building of the green tire includes making a tread rubber by overlap-winding a raw rubber tape, and the mold is provided with protrusions for molding the tread grooves on the tread rubber. During vulcanizing the green tire in the mold, one of the protrusions is positioned radially outside an end of the raw rubber tape so that the end is relatively pressed radially inwards of the tire by the protrusion.

Description

technical field [0001] The present invention relates to a method for manufacturing pneumatic tires, and more particularly, to a method for manufacturing tread rubber consisting of a plurality of turns of a raw rubber belt, which is capable of preventing molding defects and improving tire uniformity. Background technique [0002] More recently, proposals have been made to manufacture various rubber components such as tread rubber, sidewall rubber, etc. of pneumatic tires by winding narrow strips of unvulcanized rubber in an overlapping manner, such as disclosed in US Pat. No. 7,093,629. [0003] In order to increase the production efficiency of such rubber parts, it is preferable to use relatively thick rubber tapes, because if the rubber tapes are very thin, the tape needs to be wound many times, which is very time-consuming. [0004] However, if the rubber strip is thicker, the steps formed at the ends of the rubber strip will be correspondingly larger. Therefore, tire un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D30/08B29C35/02B60C11/03
CPCB29D30/60B60C11/00
Inventor 真船敏行坂本雅之
Owner SUMITOMO RUBBER IND LTD
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