Golf Ball Core and Dimple Design for Iron Shot Controllability
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Solution Overview
Problem
Existing golf balls struggle with controlling the flight distance on iron shots due to high backspin rates, which lead to increased maximum flying heights and susceptibility to wind, making it difficult for average golfers to control the ball.
Innovation Solution
A golf ball design featuring a spherical core made from a rubber composition containing polybutadiene rubber and butyl rubber, an intermediate layer with a higher slab hardness than the outermost cover, and a plurality of dimples with a total lower volume of 365 mm3 or more and an occupation ratio of 75% or more on the outermost cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the backspin rate is increased to improve spin performance and controllability, then the spin rate is improved, but the maximum flying height increases and the ball becomes more susceptible to wind
Solution Approach 1:
The patent changes the material composition parameters of the core, specifically using a butyl rubber content of 10-60 mass% in the base rubber and controlling the hardness of the intermediate layer to be greater than the cover. These parameter changes optimize the spin rate while controlling the maximum flying height to reduce wind susceptibility.
Solution Approach 2:
The patent employs composite materials in the core construction, combining polybutadiene rubber and butyl rubber in specific proportions. This composite material approach allows simultaneous optimization of spin performance and flight characteristics, achieving high spin rates while controlling maximum flying height to minimize wind impact.
2Reliability
If the backspin rate is increased to improve controllability, then the spin performance is improved, but the rolling distance decreases
Solution Approach 1:
The patent adjusts the material parameters including butyl rubber content (10-60 mass%) and intermediate layer hardness to optimize the balance between spin performance and rolling distance. These parameter changes enable improved controllability while managing the rolling distance outcome.
3Object-affected harmful factors
If the maximum flying height is decreased to reduce wind susceptibility, then the wind impact is reduced, but the spin rate may be affected
Solution Approach 1:
The patent carefully controls the material parameters, particularly the butyl rubber content (10-60 mass%) and the hardness relationship between intermediate layer and cover, to achieve a balance where maximum flying height is controlled to reduce wind impact while maintaining adequate spin rate for controllability.
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 increased spin rates and decreased maximum flying heights on iron shots, resulting in improved controllability and a shorter rolling distance, making it easier for golfers to manage the ball effectively.
Implementation Method 1
an amount of the butyl rubber ranges from 10 mass % to 60 mass % in 100 mass % of the base rubber, a slab hardness of an intermediate layer composition forming the intermediate layer is greater than a slab hardness of a cover composition forming the outermost cover
Implementation Method 2
a total lower volume of the plurality of dimples is 365 mm3 or more, and an occupation ratio of a total area of the plurality of dimples in a surface area of a virtual sphere that is assumed to have no dimples on the outermost cover is 75% or more
Data Source
AI summary
An object of the present disclosure is to provide a golf ball having improved controllability on iron shots. The present disclosure provides a golf ball 2 comprising a spherical core 4, an intermediate layer 6 and an outermost cover 8 having a plurality of dimples 10 formed thereon, wherein the spherical core 4 is formed from a rubber composition containing a polybutadiene rubber and a butyl rubber in a predetermined amount, a slab hardness of an intermediate layer composition forming the intermediate layer 6 is greater than a slab hardness of a cover composition forming the outermost cover 8, a total lower volume of the plurality of dimples 10 is 365 mm3 or more, and an occupation ratio of a total area of the plurality of dimples 10 in a surface area of a virtual sphere that is assumed to have no dimples on the outermost cover 8 is 75% or more.