Two-Piece Golf Ball Core Cover Deformation Balance
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Solution Overview
Problem
Two-piece golf balls with high core deformation for soft feel at impact suffer from poor durability due to the inability of the cover to follow core deformation, leading to breakage, especially in low-temperature conditions and mishits.
Innovation Solution
A two-piece golf ball design featuring a core with compressive deformation of 4.1 mm or greater and a thin cover with nominal thickness of 1.70 mm or less, along with a specific dimple pattern and Shore C hardness distribution, to achieve both soft feel and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a core with large compressive deformation is used to achieve soft feel at impact, then the feel at impact is improved, but the cover cannot follow the deformation and breaks, reducing durability
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compressive deformation of the core (Df ≥ 4.1 mm) and the thickness of the cover (T ≤ 1.70 mm) to achieve an optimal balance. By adjusting these parameters, the core can deform sufficiently to provide soft feel while the cover maintains enough structural integrity to prevent breakage, resolving the contradiction between feel and durability.
Solution Approach 2:
The patent uses composite materials by combining a core made from specific rubber compositions (including polybutadiene and other base rubbers with controlled hardness and deformation characteristics) with a cover made from different materials having appropriate thickness and strength properties. This composite structure allows the core to provide deformation for soft feel while the cover provides the necessary durability.
2Reliability
If the cover thickness is reduced to improve feel at impact, then the softness is improved, but the cover becomes more prone to breakage
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compressive deformation of the core (Df ≥ 4.1 mm) and the thickness of the cover (T ≤ 1.70 mm) to achieve an optimal balance. By adjusting these parameters, the core can deform sufficiently to provide soft feel while the cover maintains enough structural integrity to prevent breakage, resolving the contradiction between feel and durability.
3Ease of operation
If the core deformation is increased to provide soft feel, then the comfort on mishit is improved, but the cover breaks due to inability to follow deformation
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compressive deformation of the core (Df ≥ 4.1 mm) and the thickness of the cover (T ≤ 1.70 mm) to achieve an optimal balance. By adjusting these parameters, the core can deform sufficiently to provide soft feel while the cover maintains enough structural integrity to prevent breakage, resolving the contradiction between feel and durability.
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 provides a golf ball with excellent feel at impact and improved durability, reducing the likelihood of breakage and maintaining performance across various temperatures and hit conditions.
Implementation Method 1
An amount of compressive deformation Df of the core is equal to or greater than 4.1 mm
Implementation Method 2
The shock generated by this shot is small. Upon a mishit, a golf ball is hit at a portion of a clubface other than the sweet spot. The shock upon the mishit is large.
Implementation Method 3
A nominal thickness T of the cover is equal to or less than 1.70 mm. The golf ball has both excellent feel at impact and excellent durability.
Implementation Method 4
a Shore C hardness H of the cover meet the following mathematical formulas (1), (2), and (3)
Data Source
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AI summary
A golf ball 2 includes a core 4 and a cover 6. An amount of compressive deformation Df of the core 4 is equal to or greater than 4.1 mm. A nominal thickness T of the cover 6 is equal to or less than 1.70 mm. The golf ball 2 has a plurality of dimples 8 on a surface thereof. A value V calculated by the following mathematical formula is equal to or less than 290. V=N*So/Bb In the mathematical formula, N represents a total number of the dimples 8, So represents a ratio of a total area of all the dimples 8 relative to a surface area of a phantom sphere of the golf ball 2, and Bb represents an average (mm) of thicknesses B of the cover 6 immediately below deepest points of the dimples 8.