Golf Ball Core Hardness Profile for Spin and Impact Durability
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Solution Overview
Problem
Existing golf balls for professionals and advanced players fail to simultaneously achieve optimal flight performance, controllability in the short game, and durability on repeated impact.
Innovation Solution
A golf ball design with a single-layer core featuring a specific hardness profile, defined by Shore C hardness values at various radii from the core center, ensuring conditions such as (H62.5-H50) ≤ (H100-H87.5) < (H87.5-H75) < (H75-H62.5) ≤ 7 and (H87.5-H50)/(H50-H12.5) ≥ 3.0, enhancing distance on full shots and durability while maintaining spin controllability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the core occupies most of the volume of the golf ball to influence physical properties like rebound and durability, then the core has a large influence on rebound and durability, but it becomes difficult to simultaneously optimize flight performance and durability on repeated impact
Solution Approach 1:
The patent applies local quality by creating a core with non-uniform hardness distribution. The core hardness is designed to vary radially from the center to the surface, with specific hardness values at different radial positions (H0, H12.5, H25, H37.5, H50, H62.5, H75, H87.5, H100). This allows different regions of the core to provide different functions: the softer inner region for energy storage and rebound, and the harder outer region for durability and crack resistance, thereby resolving the contradiction between durability and flight performance.
2Reliability
If the cross-sectional hardness of the core is adjusted by changing rubber composition and vulcanization parameters, then the core hardness can be modified, but existing adjustments fail to simultaneously achieve optimal flight performance and durability
Solution Approach 1:
The patent applies parameter changes by systematically varying the hardness parameters of the core at different radial positions. Instead of using a uniform hardness value, the invention specifies multiple hardness parameters (H0, H12.5, H25, H37.5, H50, H62.5, H75, H87.5, H100) that change with radial position. This multi-parameter approach allows precise control over both durability (through harder outer regions) and flight performance (through softer inner regions), resolving the contradiction between durability and manufacturing precision of spin characteristics.
3Reliability
If a polyurethane cover is used as the outermost layer to improve durability, then durability is improved, but the ball still lacks optimal performance in flight and short game controllability
Solution Approach 1:
The patent applies composite materials by combining a polyurethane cover with a core that has a specific hardness profile. The cover provides durability and crack resistance, while the core's radially varying hardness structure contributes to optimal spin characteristics and flight performance. This composite structure allows the ball to simultaneously achieve durability from the cover and controlled performance from the core, resolving the contradiction between durability and short game controllability.
Data Source
AI summary
Provided is a golf ball including a single-layer core and a cover, wherein the core has a hardness profile in which, letting a Shore C hardness of a core surface be H100, Shore C hardnesses of an 87.5% outer position, a 75% outer position, a 62.5% outer position, a 50% outer position, a 37.5% outer position, a 25% outer position, and a 12.5% outer position of a core radius from a core center be H87.5, H75, H62.5, H50, H37.5, H25, and H12.5, respectively, and a Shore C hardness of the core center be H0, the following two conditions are satisfied:0≤(H 62.5-H50)<(H100-H 87.5)<(H 87.5-H75)< (H75-H 62.5)≤7. ,and(H 87.5-H50)/(H50-H 12.5)≥3.0.