Multi-piece Golf Ball Layering for Spin and Feel
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Solution Overview
Problem
Existing multi-piece solid golf balls fail to simultaneously achieve a low spin rate on full shots, a soft feel at impact, and good durability to repeated impact, particularly for mid-level amateur golfers with mid-range head speeds.
Innovation Solution
A multi-piece solid golf ball design featuring a core, intermediate layer, and cover with specific material properties and dimensions, including a core diameter of at least 38.0 mm, intermediate layer thickness between 0.025 and 0.043 times the core diameter, and cover thickness between 0.014 and 0.027 times the core diameter, using a resin material for the intermediate layer and urethane resin for the cover, optimized to reduce spin rate and enhance durability and feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the golf ball uses a hard cover and thick intermediate layer to reduce spin rate on full shots, then flight performance improves, but the feel at impact becomes hard and durability to repeated impact decreases
Solution Approach 1:
The golf ball is divided into multiple layers with distinct functions: a soft urethane cover for feel and durability, an intermediate layer for spin control, and a core for distance. This segmentation allows each layer to be optimized independently, resolving the contradiction between hard cover benefits and soft feel requirements
Solution Approach 2:
The golf ball uses composite materials with different properties in each layer: urethane resin for the cover providing softness and durability, and other resin materials for intermediate layers providing spin control. This composite structure enables simultaneous achievement of soft feel and low spin rate
2Reliability
If the golf ball uses a soft cover and thin intermediate layer to achieve soft feel at impact, then feel improves, but spin rate on full shots increases and flight performance deteriorates
Solution Approach 1:
The golf ball is divided into multiple layers with distinct functions: a soft urethane cover for feel and durability, an intermediate layer for spin control, and a core for distance. This segmentation allows each layer to be optimized independently, resolving the contradiction between soft feel and low spin rate
Solution Approach 2:
The golf ball uses composite materials with different properties in each layer: urethane resin for the cover providing softness and durability, and other resin materials for intermediate layers providing spin control. This composite structure enables simultaneous achievement of soft feel and low spin rate
3Reliability
If the golf ball uses thick cover and intermediate layer to improve durability to repeated impact, then durability improves, but spin rate on full shots increases and flight performance deteriorates
Solution Approach 1:
The golf ball is divided into multiple layers with distinct functions: a soft urethane cover for feel and durability, an intermediate layer for spin control, and a core for distance. This segmentation allows each layer to be optimized independently, resolving the contradiction between durability and spin rate control
Solution Approach 2:
The golf ball uses composite materials with different properties in each layer: urethane resin for the cover providing softness and durability, and other resin materials for intermediate layers providing spin control. This composite structure enables simultaneous achievement of durability and low spin rate
Data Source
AI summary
In a multi-piece solid golf ball having a core, an intermediate layer encasing the core and a cover which encases the intermediate layer and has numerous dimples on an outside surface thereof, the intermediate layer is formed of a resin material, the cover is formed of a urethane resin material, the core has a diameter of at least 38.0 mm, the sphere obtained by encasing the core with the intermediate layer has a surface hardness on the Shore D hardness scale of at least 69, the cover has a material hardness on the Shore D hardness scale of 55 or less, the (intermediate layer thickness)/(core diameter) value is from 0.025 to 0.043, the (cover thickness)/(core diameter) value is from 0.014 to 0.027, and the sphere obtained by encasing the core with the intermediate layer has an initial velocity A and the core has an initial velocity B which together satisfy the condition A−B≥0 m/s.