Multi-layer Golf Ball Core Hardness Gradient
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Solution Overview
Problem
Current golf ball technologies lack a very high positive gradient core with a very soft, low compression inner core layer formed from an unfoamed composition, which is necessary for both durability and spin reduction.
Innovation Solution
A golf ball design featuring a core with an inner core layer made from an unfoamed composition, having a diameter of 1.10 inches or less and a center Shore C hardness of 40 or less, and an outer core layer with a thickness of 0.200 inches or greater and an outer surface Shore C hardness at least 40 points greater than the inner core layer, creating a high positive hardness gradient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a soft inner core layer is used to reduce compression and improve feel, then spin reduction is achieved, but durability deteriorates
Solution Approach 1:
The core is divided into multiple layers with distinct hardness characteristics. The inner core layer has lower hardness (Shore C 30-50) for spin reduction, while the outer core layer has higher hardness (Shore C 70-90) for durability. This segmentation allows each layer to perform its specific function without compromise.
Solution Approach 2:
Different regions of the core have different hardness properties tailored to their specific functions. The inner region is softer to reduce spin on short shots, while the outer region is harder to provide durability and distance on full swings. This local differentiation of properties resolves the contradiction between spin reduction and durability.
2Reliability
If a high positive hardness gradient core is implemented to improve durability and reduce spin, then overall performance is enhanced, but manufacturing complexity increases
Solution Approach 1:
The core is segmented into discrete layers that can be manufactured separately and then assembled. This segmentation simplifies the manufacturing process compared to creating a continuous gradient, while still achieving the desired hardness progression from inner to outer layers.
Solution Approach 2:
The core uses composite construction with different rubber compositions in each layer. The inner layer uses a softer rubber compound while the outer layer uses a harder compound, creating a composite structure that achieves the high positive hardness gradient needed for durability and spin control.
Data Source
AI summary
Golf balls having a very high positive gradient multilayer core are provided. The multilayer core includes an outer core layer and a very soft, low compression inner core layer. The inner core layer is formed from an unfoamed composition and has a center hardness that is at least 40 Shore C points less than the outer surface hardness of the outer core layer.