Multi-layer Golf Ball Core Gradient Design
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Solution Overview
Problem
There is a need in the golf ball industry for improved core and cover constructions that enhance resiliency and allow for higher initial ball speed and reduced initial ball spin when driving, resulting in longer overall distance.
Innovation Solution
A multi-piece golf ball design featuring a multi-layered solid core and cover, comprising an inner core layer made from thermoset rubber, an intermediate core layer from thermoplastic material, an outer core layer from highly neutralized polymer, and cover layers from thermoplastic compositions or polyurethane-based materials, optimized for specific hardness ranges and layer thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a multi-layered core construction is used, then resiliency and initial ball speed are improved, but device complexity increases
Solution Approach 1:
The core is divided into multiple layers with different materials and hardness values. The inner core layer has a first hardness value, the intermediate core layer has a second hardness value higher than the first, and the outer core layer has a third hardness value higher than the second, creating a gradient structure that optimizes both resiliency and complexity
Solution Approach 2:
Different polymer compositions are used in each core layer to achieve specific hardness values and performance characteristics. The intermediate layer uses a composition with higher hardness than the inner layer, and the outer layer uses an even harder composition, creating a composite structure that enhances initial ball speed
2Strength
If cover layer hardness is increased, then durability is improved, but resiliency deteriorates
Solution Approach 1:
Different hardness values are assigned to different layers of the cover. The inner cover layer has a first hardness value, the intermediate cover layer has a second hardness value higher than the first, and the outer cover layer has a third hardness value higher than the second. This gradient approach allows the inner layers to provide resiliency while outer layers provide durability
Solution Approach 2:
The hardness gradient is implemented across the thickness dimension of the cover layers. By varying hardness through the depth of each layer rather than using uniform hardness, the design achieves both durability at the surface and resiliency at the inner layers
3Speed
If initial ball spin is reduced, then distance is improved, but control deteriorates
Solution Approach 1:
The invention optimizes multiple parameters including the hardness values of each layer, the thickness ratios between layers, and the material compositions. By carefully adjusting these parameters, the ball achieves reduced spin for distance while maintaining sufficient control through the balanced gradient structure
Data Source
AI summary
Multi-piece golf balls having a multi-layered solid core and multi-layered cover are provided.