Multi-piece Golf Ball Layer Hardness Design
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Solution Overview
Problem
Golf balls designed for high head-speed golfers fail to deliver sufficient deformation and performance for low head-speed golfers, resulting in poor distance and feel at impact.
Innovation Solution
A multi-piece solid golf ball with specific hardness relationships between its core, envelope layer, intermediate layer, and cover, optimized materials, and structural design to ensure excellent flight performance, feel, and durability across various head-speed ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a golf ball is designed with high hardness and specific deformation characteristics for high head-speed golfers, then excellent flight performance and spin properties are achieved at high speeds, but low head-speed golfers cannot impart sufficient deformation resulting in poor distance and feel at impact
Solution Approach 1:
The golf ball is divided into multiple layers (core, envelope layer, intermediate layer, and cover) with each layer having different hardness characteristics. The core has higher hardness while the envelope layer has lower hardness, allowing the ball to provide both excellent flight performance for high head-speed golfers and sufficient deformation for low head-speed golfers.
Solution Approach 2:
Different regions of the golf ball have different hardness properties. The core maintains high hardness for stability and flight performance, while the envelope layer has lower hardness to enable sufficient deformation upon impact. This local differentiation of properties allows the ball to satisfy conflicting requirements of high-speed and low-speed players.
2Ease of operation
If the envelope layer is made softer to improve deformation for low head-speed golfers, then better feel at impact is achieved, but durability to repeated impact deteriorates
Solution Approach 1:
The envelope layer is constructed from a composite material system consisting of an olefin-unsaturated carboxylic acid random copolymer and a non-ionomeric thermoplastic elastomer. This composite provides both the softness needed for good feel at impact and the durability required to withstand repeated impacts, resolving the contradiction between comfort and longevity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The golf ball achieves excellent flight performance and a good feel at impact for both mid and low head-speed golfers, with enhanced durability to repeated impacts.
Implementation Method 1
the core, envelope layer, intermediate layer and cover have respective surface hardnesses which satisfy the relationship: core surface hardness>envelope layer surface hardness A/B≦0.98
Implementation Method 2
by setting the deflection (mm) of the ball when compressed under a given load and the deflection (mm) of the intermediate layer-encased sphere when compressed under a given load
Implementation Method 3
a multi-piece solid golf ball endowed with both a good feel at impact and an excellent durability to repeated impact
Data Source
AI summary
In a multi-piece solid golf ball having a core, an envelope layer, an intermediate layer and a cover, the surface hardnesses of the respective layers are set so as to satisfy specific relationships. Also, the initial velocities measured for the core, for a sphere obtained by forming the envelope layer over the core (envelope layer-encased sphere), for a sphere obtained by forming the envelope layer and the intermediate layer over the core (intermediate layer-encased sphere) and for the ball are set so as to satisfy specific relationships. In addition, the deflection (mm) of the ball when compressed under a given load and the deflection (mm) of the intermediate layer-encased sphere when compressed under a given load are set so as satisfy a specific relationship.