Pneumatic Tire Protective Belt Angular Configuration
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Solution Overview
Problem
Existing pneumatic tires for construction and industrial vehicles face challenges in maintaining durability and preventing belt edge separation, particularly between the belt layers and tread rubber, due to increased strain and heat buildup from complex fiber reinforced member configurations.
Innovation Solution
A pneumatic tire design featuring cross belts with inclined steel cords and a protective belt with a larger angle of inclination, where the maximum width protective belt is positioned to reduce shear strain and heat buildup, while maintaining adequate adhesion between rubber and steel cords, thereby enhancing belt-edge-separation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fiber reinforced members are provided at both ends of protective belts to reduce steel cord movement, then belt-edge-separation resistance is improved, but structure complexity increases and heat buildup causes reduced adhesion between rubber and steel cords
Solution Approach 1:
The patent removes the fiber reinforced members from the protective belt configuration entirely. Instead of adding wrapping members at both ends of protective belts, the invention uses only steel cord belts with optimized angles and arrangements, thereby eliminating the structural complexity and heat buildup issues while maintaining belt-edge-separation resistance through the angular configuration of the steel cords themselves
Solution Approach 2:
The patent changes the angular parameters of the steel cords in the protective belts. Specifically, it configures the steel cords at different angles (with the outer steel cord belt having a larger angle than the inner steel cord belt) to optimize the distribution of strains and reduce belt-edge separation without requiring additional fiber reinforced members
2Reliability
If fiber reinforced members are added to protective belts to improve belt-edge-separation resistance, then movement of steel cords is reduced, but heat buildup from multiple fiber reinforced members reduces adhesion between rubber and steel cords
Solution Approach 1:
The patent extracts and removes the fiber reinforced members from the protective belt assembly, eliminating the heat source problem entirely. The invention achieves belt-edge-separation resistance through the angular configuration of steel cords alone, without requiring the additional fiber reinforced members that generate heat and reduce adhesion
Solution Approach 2:
The patent converts the potential harm of heat buildup from fiber reinforced members into a benefit by completely eliminating those members. The design uses only steel cord belts with optimized angular arrangements, transforming the problem of heat-induced adhesion loss into a solution where steel cords maintain their adhesion and structural integrity without thermal degradation
Data Source
AI summary
A pneumatic tire includes cross belts and one or more protective belts provided in the tire radial direction. A width of a widest protective belt is greater than a width of any of the cross belts. In the tire profile, a maximum projection position of the widest protective belt is A, an end position of the widest protective belt is B, a position at which a straight line a passing through position A extending in the direction normal to a tread surface intersects with the tread surface is A′, and a position at which a straight line b passing through position B extending in the direction normal to the tread surface intersects with the tread surface is B′. An angle formed between a first straight line that links position A and position B and a second straight line that links position A′ and position B′ is from 0° to 15°.