Golf Ball Core Hardness Gradient for Driver Distance and Iron Spin
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Solution Overview
Problem
Existing golf balls struggle to achieve a balance between high flight distance on driver shots and good spin rate on middle iron shots, as reducing the hardness difference between the surface and center of the spherical core to lower spin rate on driver shots also lowers the spin rate on middle iron shots.
Innovation Solution
A golf ball design with a specific hardness distribution in the spherical core, where the hardness at various points along the radius satisfies certain formulae to maintain resilience and control spin rates, including 0<(C1−C0)≤6.0, 0<(C2−C1)≤6.0, 0<(C3−C2)≤6.0, 0<(C4−C3)≤6.0, 5≤(C5−C4), 0<(C6−C5)≤3.5, 0<(C7−C6)≤3.5, and 0<(C8−C7)≤3.5, ensuring an outer-hard and inner-soft structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the hardness difference between the surface hardness and the center hardness of the spherical core is controlled to lower the spin rate on driver shots, then the flight distance on driver shots is improved, but the spin rate on middle iron shots is lowered
Solution Approach 1:
The patent applies local quality by creating different hardness zones within the spherical core. The core is designed with a softer inner region (lower hardness) and a harder outer region (higher hardness), so that different portions of the core serve different functions: the soft inner region maintains spin rate on middle iron shots while the hard outer region reduces spin rate on driver shots and improves flight distance
2Length of moving object
If the hardness difference between the surface hardness and the center hardness of the spherical core is increased to lower the spin rate on driver shots, then the flight distance on driver shots is improved, but the spin rate on middle iron shots is lowered
Solution Approach 1:
The patent implements local quality by establishing specific hardness relationships between different regions of the spherical core. The inner region is designed with lower hardness while the outer region has higher hardness, creating a controlled hardness gradient that simultaneously achieves low spin rate on driver shots and good spin rate on middle iron shots
Data Source
AI summary
An object of the present disclosure is to provide a golf ball having excellent flight distance on driver shots and good spin rate on middle iron shots. The present disclosure provides a golf ball comprising a spherical core and a cover, wherein a hardness difference (C1−C0), a hardness difference (C2−C1), a hardness difference (C3−C2) and a hardness difference (C4−C3) are more than 0 and 6.0 or less, a hardness difference (C5−C4) is 5.0 or more, and a hardness difference (C6−C5), a hardness difference (C7−C6) and a hardness difference (C8−C7) are more than 0 and 3.5 or less where C0 (center), C1, C2, C3, C4, C5, C6, C7 and C8 (surface) are a Shore C hardness at each point from the center obtained by dividing a radius of the spherical core into equal eight parts.