Motorcycle Tire Carcass Reinforcement for Stability
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Solution Overview
Problem
Radial tires for motorbikes struggle to maintain stability both in straight-line high-speed conditions and on curved paths with high camber angles, as existing architectures either prioritize straight-line stability or cornering stability at the expense of the other.
Innovation Solution
A carcass reinforcement design for radial tires featuring a crown reinforcement with circumferential reinforcers angled at zero to 5 degrees and a carcass reinforcement with a turnup, where the reinforcers form angles of 55° to 70° at one end and 70° to 80° at the other, providing adjustable rigidity for high camber angles, combined with a crown portion and lateral portion with specific angular variations to enhance stability in both scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the bead wire has high torsional rigidity, then the tensile loadings are efficiently reacted by the bead wire, but the turnup contribution becomes secondary and requires shorter turnup length
Solution Approach 1:
The patent optimizes the turnup geometry parameters (length, angle, and radial extension) based on the bead wire's torsional rigidity characteristics. For high torsional rigidity bead wires, the turnup can be shorter with specific angular configurations, while maintaining efficient tensile loading reaction. This parameter optimization simplifies the turnup geometry without compromising force transmission efficiency.
Data Source
AI summary
A tire for a two-wheeled motorized vehicle includes a tread joined by two sidewalls to two beads, the tread having first and second elastomer compositions, crown reinforcement, radially inside tread having a crown layer having mutually parallel circumferential reinforcers forming an angle at most equal to 5° to the circumferential direction, a carcass reinforcement, radially inside crown reinforcement, having turnup. Carcass reinforcement includes mutually parallel reinforcers, and wrapped, in each bead, from the inside to the outside of the tire, about bead wire in order to form turnup having free end E2. Carcass reinforcement includes crown portion and lateral portion, crown portion extending axially between first and second ends E2, E′2, E2 and E′2 being symmetric to equatorial plane P of the tire, lateral portion extending symmetrically to equatorial plane P radially towards the inside, from radially outermost end E2 to fourth end E4 disposed at the bead wire.