Golf Ball Core Hardness Distribution for Spin and Durability
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Solution Overview
Problem
Golf balls with reduced resilience to limit flight distance compromise durability, and existing solutions fail to achieve both high spin rates and durability for restricted flight distances.
Innovation Solution
A golf ball comprising a spherical constituent member formed from a rubber composition containing natural rubber, a co-crosslinking agent, a crosslinking initiator, and an organic sulfur compound, with specific hardness distributions to achieve high spin rates and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the resilience of the golf ball is lowered to restrict the flight distance, then the flight distance is reduced, but the durability is lowered
Solution Approach 1:
The patent applies local quality by creating distinct hardness zones within the spherical constituent member. The center hardness (Ho) is set at 65 or more Shore C, while the surface hardness (Hs) is controlled to create a hardness difference (Hs-Ho) of less than 16 Shore C. This localized hardness distribution allows the core to provide durability while the surface controls spin and flight distance, resolving the contradiction between durability and flight restriction.
Solution Approach 2:
The patent uses parameter changes by precisely controlling the hardness values at different locations within the golf ball. By setting the center hardness Ho≥65 Shore C and controlling the hardness difference (Hs-Ho)<16 Shore C, the patent modifies the physical parameters of the rubber composition to achieve both high durability (through high center hardness) and restricted flight distance (through controlled surface hardness and spin rate).
2Length of moving object
If the spin rate is increased to travel a restricted flight distance, then the flight distance is reduced, but the durability is compromised
Solution Approach 1:
The patent creates different functional zones with specific hardness characteristics. The center region with Ho≥65 Shore C provides the structural integrity and durability, while the surface region with controlled hardness difference provides the high spin rate necessary for restricted flight distance. This local differentiation allows simultaneous achievement of durability and flight restriction.
3Reliability
If natural rubber is used to improve sustainability, then environmental friendliness is improved, but achieving both durability and high spin rate becomes difficult
Solution Approach 1:
The patent uses composite materials by combining natural rubber with specific additives including a co-crosslinking agent, crosslinking initiator, and organic sulfur compound. This composite approach allows the natural rubber base to provide sustainability and durability (through high center hardness), while the composite formulation enables precise control of hardness distribution to achieve high spin rates and restricted flight distance simultaneously.
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 high spin rate on driver shots while maintaining excellent durability, suitable for restricted flight distances, enhancing performance in both durability and flight characteristics.
Implementation Method 1
the spherical constituent member is formed from a rubber composition containing (a) a rubber component containing a natural rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, and (d) an organic sulfur compound
Data Source
AI summary
An object of the present disclosure is to provide a golf ball having excellent durability and an increased spin rate on driver shots to travel a suppressed flight distance. The present disclosure provides a golf ball comprising a spherical constituent member, wherein the spherical constituent member is formed from a rubber composition containing (a) a rubber component containing a natural rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, and (d) an organic sulfur compound, a center hardness (Ho) of the spherical constituent member is 65 or more in Shore C hardness, a hardness difference (Hs−Ho) between a surface hardness (Hs) and the center hardness (Ho) of the spherical constituent member is less than 16 in Shore C hardness, and an absolute value of a hardness difference (Hs−H50) between the surface hardness (Hs) of the spherical constituent member and a hardness (H50) at a 50% point of a radius of the spherical constituent member from a center of the spherical constituent member is 10 or less in Shore C hardness.