Golf Ball Core Compressive Deformation Ratio
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Solution Overview
Problem
Current golf balls do not adequately achieve large flight distances on shots with long irons and middle irons, and they lack optimal spin control for advanced players.
Innovation Solution
A golf ball design featuring a core with a center and envelope layer, a mid layer, and a cover, where the core has a specific compressive deformation ratio and hardness distribution, and the mid and cover layers are made from specific materials and have defined thicknesses and hardness values to suppress spin and enhance flight distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a core with outer-hard/inner-soft structure is used to achieve low spin rate and high launch angle, then flight distance is improved, but spin control on short iron shots deteriorates
Solution Approach 1:
The core is segmented into three distinct layers (inner core, intermediate layer, outer core) with progressively increasing hardness, allowing each layer to contribute differently to ball speed and spin control. The inner core provides softness for high launch angle, while the outer core provides hardness for low spin rate, and the intermediate layer balances both characteristics.
Solution Approach 2:
Different regions of the core have different hardness characteristics - the center is softest, the intermediate layer is medium, and the outer core is hardest. This local variation in material properties allows the core to simultaneously achieve low spin rate (from hard outer region) and high launch angle (from soft inner region), while providing balanced spin control across different shot types.
2Speed
If mid layer thickness is reduced to improve flight distance, then ball speed increases, but spin suppression deteriorates
Solution Approach 1:
The mid layer's thickness is precisely controlled within the range of 0.5-1.5mm, and its hardness is set within 70-95 durometer. By optimizing these parameters, the mid layer achieves the right balance between allowing sufficient deformation for high ball speed and providing enough structural integrity to suppress excessive spin on long iron and middle iron shots.
3Object-generated harmful factors
If cover hardness is increased to suppress spin, then spin rate decreases, but feel and controllability on short iron shots deteriorates
Solution Approach 1:
The cover hardness is precisely controlled within the range of 40-65 durometer. This parameter optimization allows the cover to provide sufficient spin suppression for long iron and middle iron shots while maintaining enough softness for good feel and controllability on short iron shots and wedges.
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 large flight distances and controlled spin, particularly on long iron and middle iron shots, while maintaining controllability and feel on short iron shots.
Implementation Method 1
A ratio (Do/De) of an amount of compressive deformation Do of the center when a load of 981 N is applied thereto, to an amount of compressive deformation De of the core when a load of 981 N is applied thereto
Implementation Method 2
A ratio (Do/De) of an amount of compressive deformation Do of the center when a load of 981 N is applied thereto, to an amount of compressive deformation De of the core when a load of 981 N is applied thereto
Implementation Method 3
A ratio (Do/Dc) of the amount of compressive deformation Do to an amount of compressive deformation Dc of the golf ball when a load of 981 N is applied thereto
Data Source
AI summary
A golf ball 2 includes a core 4, a mid layer 6, and a cover 8. The core 4 includes a center 10 and an envelope layer 12. The ratio (Do/De) of an amount of compressive deformation Do of the center 10 to an amount of compressive deformation De of the core 4 is equal to or greater than 1.5 but equal to or less than 2.5. The ratio (Do/Dc) of the amount of compressive deformation Do of the center 10 to an amount of compressive deformation Dc of the golf ball 2 is equal to or greater than 1.8. The diameter of the center 10 is equal to or less than 20 mm. The difference (He−Ho) between a surface hardness He of the core 4 and a central hardness Ho of the center 10 is equal to or less than 40.