Multi-piece Golf Ball Core Hardness Profile Optimization
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Solution Overview
Problem
Existing multi-piece solid golf balls fail to achieve both good flight performance and a solid yet soft feel at impact, while also lacking sufficient durability against cracking.
Innovation Solution
Optimizing the hardness profile of the core and the thickness relationships among the core, envelope, and intermediate layers, specifically by controlling Shore D hardness values and layer thicknesses, to reduce spin rate and enhance initial velocity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the core hardness is increased to reduce spin rate and improve flight performance, then distance is improved, but the feel at impact becomes too hard
Solution Approach 1:
The core is divided into regions with different hardness values: a first core region with hardness 40-50 and a second core region with hardness 50-60. This local differentiation allows the ball to achieve low spin rate (improving distance) while maintaining a soft feel at impact, resolving the contradiction between flight performance and impact feel.
2Strength
If the envelope layer and intermediate layer are made thinner to improve feel at impact, then softness is improved, but durability to cracking deteriorates
Solution Approach 1:
The patent specifies precise thickness parameters for the envelope layer (0.3-1.2 mm) and intermediate layer (0.3-1.2 mm), with their sum being 0.8-1.7 mm. By optimizing these dimensional parameters, the ball achieves both soft feel at impact and sufficient durability, resolving the contradiction between comfort and reliability.
3Speed
If the core hardness gradient is increased to reduce spin rate, then flight performance is improved, but the complexity of core structure increases
Solution Approach 1:
The core structure is simplified into two distinct regions with different hardness values rather than using complex multi-layer or continuously varying gradients. This localized differentiation achieves the desired spin rate reduction while keeping the core structure relatively simple and manufacturable.
Data Source
AI summary
A multi-piece solid golf ball for professional golfers and skilled amateurs in particular is endowed with an excellent distance, a soft yet good feel at impact and a good durability. In the ball, which includes a core, an envelope layer, an intermediate layer and a cover, the core has a hardness profile which satisfies specific conditions, the envelope layer has a thickness of from 0.3 to 1.2 mm, the intermediate layer has a thickness of from 0.3 to 1.2 mm, and the envelope and intermediate layers have a combined thickness from of 0.8 to 1.7 mm.