Multi-piece Golf Ball Hardness Gradient for Low Spin
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Solution Overview
Problem
Existing golf balls with multilayer structures often prioritize qualities like spin rate, feel, and durability over distance, particularly for amateur golfers with low head speed, resulting in inadequate spin rate-lowering effects on full shots.
Innovation Solution
A multi-piece solid golf ball design featuring a core made of elastomer with a multilayer structure of five or more layers, including an outer hard layer and softer envelope and intermediate layers, optimized for hardness and thickness relationships to achieve low spin rates and high rebound, enhancing distance and feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multilayer structure with softer envelope and intermediate layers is used to achieve a soft feel on impact, then the feel on impact is improved, but the spin rate on full shots increases and distance decreases
Solution Approach 1:
The golf ball is divided into multiple layers (core, envelope layer, intermediate layer, outer layer) with distinct hardness characteristics. The envelope and intermediate layers are softer than the outer layer, creating a gradient structure that independently optimizes feel and distance performance.
Solution Approach 2:
Different layers of the golf ball have different local hardness properties. The outer layer is harder to reduce spin and increase distance, while the envelope and intermediate layers are softer to provide a pleasant feel on impact, allowing each region to fulfill its specific function.
2Speed
If the outer layer is made harder to reduce spin rate and increase distance, then the distance on full shots is improved, but the overall ball hardness increases and may reduce feel
Solution Approach 1:
The golf ball is segmented into layers with different hardness characteristics, allowing the outer layer to be optimized for distance while inner layers are optimized for feel, resolving the contradiction between these two performance aspects.
Solution Approach 2:
The golf ball uses a composite multilayer structure where materials with different hardness properties are combined. The harder outer layer composite provides low spin and long distance, while the softer inner layer composites maintain a soft feel on impact.
Data Source
AI summary
A multi-piece solid golf ball has a core, an envelope layer encasing the core, an intermediate layer encasing the envelope layer, and an outer layer which encases the envelope layer and has formed on a surface thereof a plurality of dimples. The core is made of an elastomer. The envelope layer is formed of an inner envelope layer and an outer envelope layer, and the intermediate layer is formed of an inner intermediate layer and an outer intermediate layer. Letting the average hardness of the core be expressed by the following formula: average core hardness (Shore D)=[core surface hardness (Shore D)+core center hardness (Shore D)]/2, the outer layer has a hardness (Shore D) which is higher than the average core hardness and each of the envelope layers and the intermediate layers is softer than the outer layer.