Mini Rim Tire Structure for Higher EV Load Without Pressure Increase
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Solution Overview
Problem
Existing passenger vehicle tires are unable to carry the increased weight of electric vehicle batteries without compromising vehicle roominess, compactness, and comfort, as they either require larger sizes or higher inflation pressures, which lead to increased noise, energy dissipation, and temperature issues.
Innovation Solution
A tire design with a higher load index and a specific axial width to rim width ratio (T2/A ≤ 1.00) that maintains the same size as existing EXTRA LOAD tires, featuring a straighter sidewall and a single or dual carcass layer reinforcement to enhance radial stiffness and reduce energy dissipation and temperature rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the tire size is increased to carry heavier load, then the load-bearing capacity is improved, but the vehicle interior space is reduced and exterior bulk is enlarged
Solution Approach 1:
The patent changes the structural parameters of the tire by increasing the load index (from 94 to 100 or higher) while maintaining the same nominal size designation. This allows the tire to carry heavier loads (800 kg vs 670 kg) without changing the overall tire dimensions, thus preserving vehicle interior space and exterior bulk.
2Strength
If the tire size is increased to carry heavier load, then the load-bearing capacity is improved, but the rolling resistance increases
Solution Approach 1:
The patent achieves higher load capacity through parameter changes in tire construction (increased load index, modified reinforcement structure) rather than increasing tire size. This prevents the increase in rolling resistance that would normally accompany larger tires, thereby reducing energy loss and improving fuel efficiency.
3Strength
If the tire size is increased to carry heavier load, then the load-bearing capacity is improved, but the external noise increases
Solution Approach 1:
The patent increases load-bearing capacity through parameter changes in tire construction (higher load index, modified reinforcement) while maintaining the same nominal size. This prevents the increase in external noise that would result from larger tire dimensions, thus reducing noise pollution.
4Strength
If the inflation pressure is increased to carry heavier load, then the load-bearing capacity is improved, but the passenger comfort is reduced
Solution Approach 1:
The patent changes the structural parameters of the tire (increased load index, modified reinforcement structure) to achieve higher load capacity without increasing inflation pressure. This maintains the original pressure level (290 kPa), thereby preserving passenger comfort while carrying heavier loads.
5Strength
If the load index is increased to carry heavier load, then the load-bearing capacity is improved, but the energy dissipation and temperature rise increase
Solution Approach 1:
The patent increases the load index and modifies the reinforcement structure to achieve higher load capacity while controlling energy dissipation. The specific parameter optimization (axial width to rim width ratio) ensures that the tire structure efficiently handles the increased load without excessive energy loss or temperature rise in the bead and shoulder regions.
Data Source
AI summary
The tire (11) for a passenger vehicle comprises an axially narrowest working layer (26), the axially narrowest working layer (26) having an axial width T2 expressed in mm. The tire is adapted to be mounted (10) on a mounting support (100) comprising a rim (200) having a rim width A expressed in mm and a rim width code according to the ETRTO 2019 Standards Manual. The tire (11) has a load index L1 such that LI≥LI′+1, LI′ being the load index of an EXTRA LOAD tire of the same size according to the ETRTO 2019 Standards Manual. The ratio T2/A is such that T2/A≤1.00. The rim width code is equal to the measuring rim width code for the tire size minus 0.5.