Golf Ball Multi-Layer Design for Spin Control
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Solution Overview
Problem
Golf balls with flexible covers tend to generate excessive spin upon shots with middle irons, leading to insufficient flight distance due to excessive lift force.
Innovation Solution
A golf ball design featuring a core, a mid layer, and a cover with specific compressive deformation and hardness ratios, where the cover suppresses slip between the club face and ball, efficiently converting hitting force to kinetic energy while minimizing spin on middle iron shots, thereby enhancing flight distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flexible cover is used to improve controllability upon approach shots, then controllability is improved, but excessive spin occurs upon shots with middle iron leading to insufficient flight distance
Solution Approach 1:
The golf ball is divided into multiple functional layers: a core layer, a mantle layer with specific hardness (50-70 Shore D), and a cover layer with specific hardness (30-50 Shore D). Each layer is optimized for its specific function - the mantle layer controls spin generation while the cover layer provides grip and controllability, resolving the contradiction between controllability and flight distance
Solution Approach 2:
Different regions of the golf ball have different hardness properties tailored to their functions. The cover layer has lower hardness (30-50 Shore D) than the mantle layer (50-70 Shore D) to provide grip and spin control on approach shots, while the overall ball construction limits excessive spin on middle iron shots through the harder mantle layer's spin suppression
2Use of energy by moving object
If the cover suppresses slip between club face and ball to convert hitting force to kinetic energy efficiently, then energy conversion efficiency is improved, but spin suppression on middle iron shots becomes challenging
Solution Approach 1:
The patent specifies precise hardness parameter ranges for different layers: mantle layer hardness of 50-70 Shore D and cover layer hardness of 30-50 Shore D. These parameter specifications optimize the balance between energy transfer efficiency (requiring firm contact) and spin control (requiring appropriate friction), allowing the ball to efficiently convert hitting force to kinetic energy while suppressing excessive spin on middle iron shots
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 design achieves both excellent controllability on approach shots and improved flight performance on middle iron shots by controlling spin and lift force, resulting in increased flight distance.
Implementation Method 1
the cover suppresses occurrence of a slip between the face of a golf club and the golf ball
Data Source
AI summary
A golf ball includes a core, a mid layer, and a cover. A ratio R1 calculated by mathematical formula (1): R1=(Df1−Df2)/(Df2−Df3) is not less than 5.00. A ratio R2 calculated by mathematical formula (2): R2=(T2*H2)/H3 is not less than 2.00. A ratio R3 calculated by mathematical formula (3): R3=D1/T3 is not less than 50. In mathematical formulas (1) to (3), Df1 represents an amount of compressive deformation of the core, Df2 represents an amount of compressive deformation of a sphere including the core and the mid layer, Df3 represents an amount of compressive deformation of the golf ball, T2 represents a thickness of the mid layer, H2 represents a hardness of the mid layer, H3 represents a hardness of the cover, D1 represents a diameter of the core, and T3 represents a thickness of the cover.