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
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- TOYO TIRE CORP
- Filing Date
- 2022-06-21
- Publication Date
- 2026-06-26
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.
Smart Images
Figure 0007880750000001 
Figure 0007880750000002 
Figure 0007880750000003
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
Need to check novelty before this filing date? Find Prior Art