Multi-piece Golf Ball Core Hardness Profile for Distance and Durability
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Solution Overview
Problem
Current multi-piece solid golf balls face challenges in achieving a balance between increased distance, soft feel at impact, and maintaining durability against cracking, with existing designs often compromising on one or more of these parameters.
Innovation Solution
A multi-piece solid golf ball design featuring a center core and envelope layer made of elastic materials, with specific radius and cross-sectional hardness conditions, and an intermediate layer composed of thermoplastic resin, optimized to satisfy conditions that enhance distance, feel, and durability, including a four-layer construction with a center core, envelope layer, intermediate layer, and cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the core hardness is increased to improve distance and reduce spin rate, then flight performance is improved, but the feel at impact becomes harder and durability to cracking decreases
Solution Approach 1:
The core is designed with non-uniform hardness distribution, where the center region has different hardness properties than the outer region. This allows the center to provide high rebound for distance while the outer region maintains flexibility for durability and soft feel, resolving the contradiction between speed and reliability.
Solution Approach 2:
The patent optimizes specific parameters including core radius (5≦r≦15mm) and cross-sectional hardness values at different radial positions. By precisely controlling hardness parameters H0 (center), Hr-2 (2mm inside surface), Hr-1 (1mm inside surface), and Hr (surface), the ball achieves both high initial velocity and resistance to cracking.
2Speed
If the core hardness is increased to reduce spin rate on full shots, then flight performance is improved, but the feel at impact becomes less soft
Solution Approach 1:
The core exhibits spatially varying hardness properties, with the center region optimized for rebound (affecting initial velocity) and the outer region optimized for impact feel. This local differentiation allows simultaneous achievement of high speed and soft feel that would be contradictory in a uniform core.
Solution Approach 2:
The core is constructed as a composite structure with different material properties in different regions. The combination of a harder center and softer outer region creates a composite core that delivers both high initial velocity and soft impact feel, resolving the contradiction between performance and comfort.
3Speed
If the intermediate layer is made harder to suppress excessive spin, then distance is improved, but the overall ball durability and feel deteriorate
Solution Approach 1:
The intermediate layer parameters are precisely optimized, including thickness (0.5≦t1≦2.0mm) and hardness (50≦H1≦70). This controlled parameter range allows the intermediate layer to suppress excessive spin for distance while maintaining overall ball durability and preventing cracking.
Solution Approach 2:
The intermediate layer uses composite materials combining thermoplastic resin (40-70 wt%) and rubber material (30-60 wt%). This composite composition provides the right balance of hardness for spin control and flexibility for durability, resolving the contradiction between distance and reliability.
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 excellent flight performance on full shots with a driver, provides a soft feel at impact, and prevents a decline in durability to cracking, ensuring a good balance of performance and longevity.
Implementation Method 1
having the center core and envelope layer each made of an elastic material
Data Source
AI summary
In a multi-piece solid golf ball having a core formed of a center core encased by an envelope layer, a cover having a plurality of dimples on its surface, and one or more intermediate layer disposed between the core and the cover, the center core and the envelope layer are each made of an elastic material, the radius r (mm) of the center core satisfies the condition 5≦r≦15, and the core has a cross-sectional hardness profile that satisfies specific conditions. This golf ball has an increased distance and a soft feel at impact, and also is able to prevent a decline in the durability to cracking.