Tire Curing Mold Vent Hole Diameter Differentiation
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Solution Overview
Problem
Conventional tire curing molds with vent holes in the side forming surface struggle to prevent air accumulation in recess portions, leading to rubber fractures and compromised tire appearance, especially when projection portions are designed for decoration or enhanced performance.
Innovation Solution
The tire curing mold features larger diameter vent holes within recess portions compared to the main side forming surface, promoting rubber flow and air dispersion, while maintaining adequate rubber thickness and preventing unnecessary rubber suction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a recess portion is provided on the side forming surface to accommodate projection portions on the tire, then the tire design property and decorative property are enhanced, but the rubber flow within the recess portion is lowered and air accumulation is generated causing rubber fracture
Solution Approach 1:
The patent applies local quality by providing vent holes with different diameters at different locations: larger diameter vent holes are provided within recess portions to promote rubber flow and discharge air, while smaller diameter vent holes are provided on the profile to prevent unnecessary rubber suction. This localized differentiation of vent hole characteristics resolves the contradiction between achieving good tire appearance with projection portions and preventing air accumulation causing rubber fracture.
2Reliability
If vent holes are provided in the side forming surface to discharge extra air, then air accumulation causing rubber fracture is prevented, but rubber flow is reduced and rubber thickness is compromised
Solution Approach 1:
The patent differentiates vent hole diameters based on location: larger diameter vent holes within recess portions effectively discharge air accumulation, while smaller diameter vent holes on the profile minimize rubber loss. This localized differentiation maintains rubber thickness while preventing air accumulation causing rubber fracture.
3Reliability
If larger diameter vent holes are provided within recess portions to promote rubber flow, then air accumulation is suppressed, but unnecessary rubber suction occurs compromising rubber thickness
Solution Approach 1:
The patent provides larger diameter vent holes specifically within recess portions where air accumulation is most problematic, while providing smaller diameter vent holes on the profile where rubber thickness must be maintained. This localized differentiation suppresses air accumulation in recess portions while preventing unnecessary rubber suction on the profile.
Solution Approach 2:
The patent segments the vent hole system into two distinct types based on location: larger diameter vent holes for recess portions and smaller diameter vent holes for the profile. This segmentation allows each type of vent hole to be optimized for its specific function, resolving the contradiction between air accumulation suppression and rubber thickness retention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively suppresses air accumulation, prevents rubber fractures, and ensures a good tire appearance by enhancing rubber flow within recess portions without compromising rubber thickness or requiring complex trimming.
Implementation Method 1
a diameter of a vent hole which is open within the recess portion is set to be larger than a diameter of a vent hole which is open on the profile of the side forming surface... the rubber at the curing time is aggressively brought in the recess portion. As a result, the air is spread as well as a rubber flow within the recess portion is promoted
Data Source
AI summary
A tire curing mold comprises a plurality of vent holes provided on a side forming surface coming into contact with a side wall portion of a tire. The side forming portion is provided with a recess portion which is recessed toward an outer side in a tire width direction from a profile of the side forming surface. A diameter of a vent hole which is open within the recess portion is set to be larger than a diameter of a vent hole which is open on the profile of the side forming surface.