Tire molds and tires

The tire mold design with circumferential and radial grooves and bypasses ensures continuous air flow, addressing air pocket formation by sprues, enhancing tire surface quality and reducing waste.

JP7880750B2Active Publication Date: 2026-06-26TOYO TIRE CORP
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Patent Information

Application Number
JP2022099333
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-06-21
Publication Date
2026-06-26
Estimated Expiration
2042-06-21

AI Technical Summary

Technical Problem

The formation of air pockets and depressions (bears) on tire surfaces during vulcanization molding due to air accumulation caused by sprues blocking air flow paths in the tire mold, leading to incomplete air discharge.

Method used

Incorporation of circumferential and radial grooves with vent holes in the tire mold, along with bypass grooves to ensure continuous air flow even when sprues remain in the vent holes, preventing air accumulation.

Benefits of technology

Effectively suppresses the occurrence of bears on tire surfaces by maintaining efficient air discharge, even when sprues break off and remain in the vent holes, without increasing the number of grooves or vent holes, thus improving tire appearance and reducing rubber waste.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

To provide a tire mold and a tire capable of suppressing an occurrence of bareness even when spew remains in a vent hole.SOLUTION: In a tire mold that has a side mold part that molds a sidewall of a tire, the side mold part includes: a circumferential groove extending in a circumferential direction of the tire; a radial groove that extends in a radial direction of the tire and intersects with the circumferential groove; a vent hole provided at an intersection of the circumferential groove and the radial groove; and a bypass of at least one of a grooved first bypass connected to a first part of the circumferential groove located on a first side of the tire circumferential direction across the vent hole and to the radial groove, a grooved second bypass connected to a second part of the circumferential groove located on a second side of the tire circumferential direction across the vent hole and to the radial groove, and a grooved third bypass extending without intersecting the radial groove and connected to the first part and the second part.SELECTED DRAWING: Figure 6
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Citation Information

Patent Citations

  • Bladder for vulcanizing tire, method for vulcanization molding tire, and pneumatic tire

    JP2009269235A

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    JP2010274740A

  • Tire and tire molding mold

    JP2021028213A

  • Tire vulcanization molding mold

    JP2021094700A