Pneumatic Tire Reinforcement Strips for Cornering Stiffness
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Solution Overview
Problem
Existing pneumatic vehicle tires face challenges in achieving good cornering stiffness while maintaining low weight and low rolling resistance.
Innovation Solution
The use of steel filaments in reinforcement strips with specific dimensions and angles, positioned within the tire's structure to enhance cornering stiffness, where the filaments are arranged at an angle of 30° to 40° relative to the circumferential direction, and have a width of 20% to 35% of the wider belt layer's width, contributing to improved compression resistance and reduced weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel filaments are used in reinforcing strips with specific dimensions and angles, then cornering stiffness is improved, but weight increases
Solution Approach 1:
The patent applies local quality by positioning reinforcing strips with steel filaments specifically in the lateral belt areas where cornering stiffness is needed, rather than uniformly across the entire tire. The steel filaments are arranged at specific angles (30°-40° to circumferential direction) and dimensions (0.2mm-0.5mm diameter) only in regions requiring enhanced lateral stability, thus improving cornering stiffness locally without adding unnecessary weight to the entire tire structure.
Solution Approach 2:
The patent utilizes parameter changes by optimizing the steel filament dimensions (diameter 0.2mm-0.5mm, length 20mm-50mm) and orientation angles (30°-40° to circumferential direction) to achieve the desired cornering stiffness. By carefully controlling these parameters, the patent achieves improved lateral stability while minimizing the amount of steel material required, thereby reducing overall weight increase.
2Reliability
If reinforcing strips with steel filaments are added to enhance cornering stiffness, then tire durability is improved, but rolling resistance increases
Solution Approach 1:
The reinforcing strips with steel filaments are positioned specifically in the lateral belt areas rather than across the entire tread width. This localized reinforcement provides the necessary durability improvement in regions subject to lateral stresses during cornering, while leaving the central tread area with lower rolling resistance characteristics intact, thus minimizing the overall increase in rolling resistance.
Solution Approach 2:
The patent applies partial action by using reinforcing strips that cover only a portion of the belt width (with strip width being 10%-40% of the wider belt layer width). This partial reinforcement provides sufficient durability improvement for lateral stability without excessively increasing rolling resistance across the entire tire contact patch.
3Strength
If reinforcing strips are made wider to improve cornering stiffness, then lateral stability is enhanced, but weight increases
Solution Approach 1:
The patent optimizes the width parameter of reinforcing strips, specifying that the strip width should be 10%-40% of the wider belt layer width. This parameter optimization achieves sufficient lateral stability improvement without excessive width that would cause unnecessary weight increase. The steel filament diameter is also optimized at 0.2mm-0.5mm to provide adequate strength with minimal weight.
Data Source
Figure 1~2
AI summary
Radial-type pneumatic vehicle tires comprising a carcass insert (4), two belt layers (2a, 2b) and a belt bandage (3), wherein a reinforcing strip (2c) is arranged radially within the radially inner belt layer (2a) in the lateral belt areas, which extends around the circumference of the tire in contact with the radially inner belt layer (2a) and the carcass insert (4), wherein each belt layer (2a, 2b) has reinforcing elements (2'a, 2'b) running parallel to each other, which extend at an angle (α) of 20° to 40° to the circumferential direction and wherein the reinforcing elements (2'a) in one belt layer (2a) cross the reinforcing elements (2'b) in the other belt layer (2b), and wherein the reinforcing strips (2c) have reinforcing elements (2'c) embedded in rubber material, running parallel to each other and at an angle (β) of 55° to 90° to the circumferential direction;The reinforcing strips (2c) have an axial width (b2) of 20% to 35% of the width (b1) of the wider belt layer (2a) and comprise steel filaments (2'c) as reinforcing elements with a diameter or thickness determined in the radial direction of 0.2 mm to 0.5 mm and a tensile strength of 3050 N/mm2 to 3650 N/mm2.