Two-Piece Golf Ball Core Frequency Optimization
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Solution Overview
Problem
Two-piece golf balls fail to provide a soft feel upon impact, particularly for beginners, leading to high mishit frequencies and loss of balls, making them unsuitable for cost-effective options.
Innovation Solution
A two-piece golf ball design with a core and cover, where the secondary natural frequency ratio is optimized to achieve a soft feel by using a rubber composition with specific crosslinking agents and a thermoplastic resin cover, ensuring a Shore C hardness difference and compressive deformation for improved resilience and feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a two-piece golf ball structure is used, then manufacturing cost is reduced and simplicity is improved, but feel at impact upon putting becomes hard
Solution Approach 1:
The patent applies parameter changes by optimizing the secondary natural frequency of the core (NF(2)1) and the golf ball (NF(2)2) to satisfy the formula V = NF(2)2 - NF(2)1 ≤ 1080 Hz. This frequency parameter adjustment allows the two-piece ball to achieve soft feel at impact upon putting while maintaining the simple and cost-effective two-piece structure.
Solution Approach 2:
The patent uses composite materials by combining a core made from rubber composition (containing polybutadiene, zinc oxide, zinc acrylate, and crosslinking agents) with a cover made from thermoplastic resin. This composite structure enables the ball to achieve both low manufacturing cost and soft feel at impact, resolving the contradiction between simplicity and performance.
2Strength
If core hardness is increased for resilience, then flight performance is improved, but feel at impact upon putting becomes harder
Solution Approach 1:
The patent applies parameter changes by controlling the Shore C hardness of the core within a specific range (50-70) and optimizing the frequency parameters (V ≤ 1080 Hz). This allows the core to provide sufficient resilience for good flight performance while maintaining soft feel at impact upon putting through the balanced hardness and frequency characteristics.
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 a soft feel upon impact while maintaining low manufacturing costs and excellent flight performance, suitable for both beginners and experienced players.
Implementation Method 1
a core and a cover which are positioned outside the core... feel at impact upon putting is soft
Implementation Method 2
rubber composition with specific crosslinking agents... improved resilience and feel
Implementation Method 3
rubber composition with specific crosslinking agents... improved resilience
Implementation Method 4
amount of compressive deformation... improved resilience and feel
Data Source
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AI summary
A golf ball (2) includes a core (4) and a cover (6). A value V calculated by the following mathematical formula is equal to or less than 1080 Hz. V = NF(2)2 - 2/3 *NF(2)1 In the mathematical formula, NF(2)1 represents a secondary natural frequency of the core (4), and NF(2)2 represents a secondary natural frequency of the golf ball (2). A difference (H1s-H1o) between a Shore C hardness (H1s) at a surface of the core (4) and a Shore C hardness (H1o) at a central point of the core (4) is equal to or greater than 10. An amount of compressive deformation (Df1) of the core (4) is equal to or greater than 4,1 mm.