Multi-piece Golf Ball Hardness Profile for Distance and Spin
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Solution Overview
Problem
Multi-piece solid golf balls struggle to achieve both excellent distance performance and spin performance on approach shots, particularly for professional golfers and skilled amateurs, due to inadequate spin rate control and trajectory maintenance during high head-speed shots.
Innovation Solution
A golf ball design with a core, envelope layer, and cover structure featuring specific hardness profiles and thickness relationships, where the cover is hard on the inside and soft on the outside, and the intermediate layer is harder than the cover, with a core hardness profile that reduces spin rate, ensuring a three-layer cover structure with a rubber composition and thermoplastic resin materials for enhanced resilience and scuff resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the core hardness profile is made uniform throughout, then the ball achieves good distance performance on driver shots, but the spin rate on approach shots becomes insufficient
Solution Approach 1:
The core is designed with non-uniform hardness distribution, featuring a softer center region and harder outer region. This local differentiation allows the center to deform and generate spin on approach shots, while the outer region maintains structural integrity for distance performance on driver shots.
2Ease of operation
If the cover is made uniformly hard, then the ball achieves good spin performance on approach shots, but the trajectory becomes unstable on full shots with driver
Solution Approach 1:
The cover is designed with non-uniform hardness, featuring a harder inner region adjacent to the intermediate layer and a softer outer region at the surface. This gradient structure provides stability for trajectory control on full shots while enabling sufficient spin on approach shots through the softer outer surface.
3Ease of operation
If the intermediate layer is made softer to improve feel on approach shots, then the ball achieves good spin performance, but the distance performance on driver shots decreases
Solution Approach 1:
The intermediate layer is designed with non-uniform hardness, featuring a softer inner region adjacent to the core and a harder outer region adjacent to the cover. This gradient allows the inner soft region to enhance feel and spin on approach shots, while the outer hard region maintains structural support for distance performance on driver shots.
4Speed
If the envelope layer is made thinner to reduce weight, then the ball achieves better initial velocity on driver shots, but the scuff resistance and durability decrease
Solution Approach 1:
The envelope layer is designed with non-uniform thickness, featuring a thinner region at the equator and thicker regions at the poles. This differential thickness reduces overall weight and maintains initial velocity while the thicker polar regions provide enhanced scuff resistance and durability where impact forces are concentrated.
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 superior flight and control performances, maintaining a straight trajectory and high spin performance on approach shots, while ensuring excellent distance and scuff resistance, even under harsh conditions.
Implementation Method 1
a core made of a rubber composition with a hardness profile that further reduces the spin rate on full shots
Implementation Method 2
giving a ball structure having four layers
Data Source
AI summary
Multi-piece solid golf ball having a core, an envelope layer encasing the core, an intermediate layer encasing the envelope layer, and an outermost layer encasing the intermediate layer, the envelope layer-encased sphere, the intermediate layer-encased sphere and the ball have surface hardnesses which satisfy a specific relationship, the intermediate layer and the cover have thicknesses which satisfy a specific relationship, and the core has a hardness profile in which the hardnesses at the core surface, core center, a position 5 mm from the core center, and a position midway between the core surface and center satisfy specific relationships.