Pneumatic Tire Bead Reinforcement Angle for Cornering Rigidity
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Solution Overview
Problem
Existing pneumatic vehicle tires face challenges in achieving improved cornering rigidity and reduced run-in length without compromising rolling resistance.
Innovation Solution
The bead reinforcement is strategically arranged between the carcass and the carcass turn-up, forming a double coupling with an angle of 30° to 70°, which enhances the stiffness of the bead area and sidewall, reducing shear deformations and improving torsional rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the bead reinforcement is arranged axially outside the carcass turn-up to stiffen the bead area, then cornering rigidity is improved, but the run-in length increases and handling is degraded
Solution Approach 1:
The bead reinforcement is positioned in the radial dimension between the carcass and carcass turn-up, rather than axially outside the turn-up. This radial placement creates a double coupling effect that stiffens the bead area while maintaining proper handling characteristics through optimized geometric arrangement
Solution Approach 2:
The bead reinforcement acts as an intermediary element between the carcass and carcass turn-up, coupling them together radially. This intermediate positioning allows the reinforcement to transfer forces effectively between these two structural components, achieving both cornering rigidity and handling performance
2Strength
If the reinforcement angle is reduced to 10°-30° to reduce shear deformations, then cornering rigidity is improved, but the coupling effect with carcass and carcass turn-up is insufficient
Solution Approach 1:
The reinforcement angle is optimized to 30°-70° relative to the circumferential direction, representing a parameter change from conventional smaller angles. This angular optimization, combined with the radial positioning between carcass and turn-up, creates effective double coupling while controlling shear deformations through the specific angle range
3Strength
If additional bead reinforcement layers are added to increase stiffness, then cornering rigidity is improved, but rolling resistance increases and material costs rise
Solution Approach 1:
Instead of adding more reinforcement layers, the solution segments the reinforcement function by positioning a single bead reinforcement layer radially between the carcass and carcass turn-up. This segmentation allows the same reinforcement to couple with both structures simultaneously, achieving enhanced cornering rigidity without additional material or increased rolling resistance
Data Source
Figure 1
AI summary
The invention relates to a vehicle pneumatic tire with a radial carcass (2) and two bead areas (1), wherein each bead area has a bead core (3) and a bead core rider (4) seated on the bead core (3), wherein the carcass (2) is guided from axially inside to axially outside around the bead cores (3) and the bead core riders (4) and is guided back onto the carcass as a carcass rise (2a) and wherein a bead reinforcement (6) reinforced with reinforcing elements is arranged in each bead area. The bead reinforcement (6) is arranged between the carcass (2) and the carcass high-profile edge (2a) that is traced back to the carcass (2), such that the bead reinforcement (6) is directly adjacent to both the carcass (2) and the carcass high-profile edge (2a) and that the reinforcing elements of the bead reinforcement (6) form an angle α with the circumferential direction, which lies in a range of 30° to 70°.