Pneumatic Tire Wing Profile Radial Positioning
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Solution Overview
Problem
Conventional pneumatic vehicle tire designs suffer from material shifts during vulcanization due to wing profiles extending into sidewall areas, limiting sidewall thickness and increasing rolling resistance, weight, and tire noise.
Innovation Solution
The wing profiles are positioned radially outside the mold separation boundary between the segment ring and sidewall shells, allowing thinner sidewall profiles that reduce material exposure to loads and heat loss, and decouple the tire's head area from the bead area, thereby reducing rolling resistance and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If wing profiles extend into sidewall areas to provide structural support, then tire strength is improved, but material shifts occur during vulcanization and sidewall thickness cannot be reduced
Solution Approach 1:
The tire structure is segmented by positioning the wing profiles and sidewall profiles in distinct radial zones separated by the mold parting line. This segmentation prevents material interaction and shifting during vulcanization while maintaining structural integrity through properly positioned reinforcement elements.
Solution Approach 2:
The solution moves the wing profiles to a different radial dimension (radially outside the mold separation) rather than allowing them to overlap in the same space. This dimensional separation eliminates the material shift problem while preserving the structural support function.
2Manufacturing precision
If sidewall profiles are made thicker to prevent material shifts, then manufacturing precision is improved, but rolling resistance and weight increase
Solution Approach 1:
By segmenting the tire structure so that wing profiles and sidewall profiles occupy separate radial zones, the invention enables thin sidewall profiles without material shifting. This segmentation allows optimization of sidewall thickness for energy efficiency while maintaining manufacturing precision.
Solution Approach 2:
The invention changes the radial position parameter of the wing profiles relative to the mold parting line. This parameter change enables sidewall thickness to be reduced to optimal values for minimizing rolling resistance and weight, while preventing material shifts through proper zonal separation.
3Loss of energy
If sidewall profiles are made thinner to reduce rolling resistance, then energy loss is reduced, but material shifts occur during vulcanization
Solution Approach 1:
The tire structure is divided into distinct radial zones with wing profiles in one zone and sidewall profiles in another, separated by the mold parting line. This segmentation allows sidewall profiles to be made thin for energy efficiency without causing material shifts during vulcanization.
Solution Approach 2:
The mold parting line acts as an intermediary boundary that separates the wing profile region from the sidewall profile region. This intermediary structure prevents direct material interaction and shifting while allowing thin sidewall construction for reduced rolling resistance.
4Strength
If wing profiles are positioned inside the mold separation, then structural support is provided, but tire noise increases due to coupled head and bead areas
Solution Approach 1:
The tire is segmented into functionally independent zones by positioning wing profiles radially outside the mold separation. This segmentation mechanically decouples the head area from the bead areas, reducing noise transmission while maintaining structural support through properly positioned reinforcement elements.
Solution Approach 2:
The mold separation acts as a mechanical decoupling intermediary between the head and bead areas of the tire. By positioning wing profiles outside this separation, the structure allows independent movement of head and bead areas, reducing noise while maintaining overall structural integrity.
Data Source
Figure 1
AI summary
A vehicle pneumatic tire, which has been vulcanized in a vulcanization mold with a segmented ring and two sidewall shells, the mold boundaries of which leave visible boundary points at or in the shoulder areas, and which has a tread (1), sidewall profiles (6), a multi-layer belt bond (7), a radial carcass (8) which surrounds bead cores (3) in bead areas (2) from axially inside to axially outside, and furthermore has a horn profile (5) in each bead area (2) which is overlapped on the outside by a radially inner end section (6b) of the sidewall profile (6) tapering towards the bead core (3), wherein a wing profile (10) runs in each shoulder area, which overlaps a radially outer end section (6a) of the sidewall profile (6) tapering towards the tread (1) from the outside.The wing profiles (10) are located radially outside the boundary points (11) left by the form boundaries between the segment ring and the side wall shells.