Golf Club Shaft Bias Prepreg Rigidity Control
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Solution Overview
Problem
Conventional golf club shafts with prepregs of different fiber directions cause variations in rigidity at layer interfaces, leading to inconsistencies in ball impact parameters such as club head speed, ball speed, launch angle, backspin, maximum height, and carry.
Innovation Solution
Using only pairs of bias prepregs with fiber directions inclined between 22 and 28 degrees as full-length layers, reducing the difference in rigidity between layers and optimizing bending, crushing, and torsional rigidity, with optional partial 0-degree prepregs and weighting cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If full-length 0-degree, 90-degree and 45-degree layers are combined to achieve desired rigidity properties, then bending rigidity, crushing rigidity and torsional rigidity can be optimized, but rigidity difference at layer boundaries causes variations in ball impact parameters
Solution Approach 1:
The patent changes the fiber angle parameter from conventional 0-degree, 90-degree, and 45-degree combinations to specifically 22-28 degree bias layers. This parameter change reduces the rigidity difference at layer boundaries while maintaining balanced bending, crushing, and torsional rigidity, thereby eliminating variations in ball impact parameters.
Solution Approach 2:
The patent applies different fiber orientation angles (22-28 degrees) specifically at the bias layer positions where rigidity transitions occur. By localizing this specific angle configuration at the interfaces between layers, the patent reduces rigidity discontinuities without compromising the overall structural performance.
2Strength
If multiple types of prepregs with different fiber directions are used to achieve comprehensive rigidity, then structural performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent makes the bias prepreg layers (22-28 degrees) universal by using the same layer type throughout the entire shaft length. These bias layers simultaneously provide bending, crushing, and torsional rigidity, eliminating the need for multiple specialized layer types and simplifying the manufacturing process.
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
This configuration suppresses variations in ball impact parameters by ensuring a well-balanced rigidity distribution, resulting in more consistent performance across different impacts.
Implementation Method 1
a shaft body formed by thermally curing a plurality of prepregs made of reinforced fibers impregnated with a thermosetting resin
Data Source
AI summary
A golf club shaft and a golf club using such a golf club shaft are achieved, wherein the golf club shaft is capable of suppressing variations of various parameters at impact by reducing the difference in rigidity between the layers of the shaft body. The golf club shaft includes full-length bias prepregs provided only as a plurality of pairs thereof and as full-length layers that extend over an entire length of the shaft body, wherein fiber directions of each pair of the full-length bias prepregs are inclined at an angle within a range of 22 degrees through 28 degrees relative to a longitudinal direction of the shaft body, respectively.