Golf Club Shaft Bias Layer Elastic Modulus Design
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Solution Overview
Problem
Conventional golf club shafts with high torsional rigidity at the tip end struggle to absorb shock during impact, leading to undesirable hit feelings and poor durability due to high tensile elastic modulus bias fibers, which also compromise directional stability.
Innovation Solution
A golf club shaft design featuring a tip-side bias layer with a lower tensile elastic modulus than the butt-side bias layer, where the bias layers overlap, allowing for controlled torsional rigidity and strength distribution to enhance both hit ball feeling and directional stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If bias fibers with larger tensile elastic modulus are used to increase torsional rigidity at the tip end, then directional stability of the hit ball is improved, but shock absorption capability deteriorates and hit feeling becomes undesirable
Solution Approach 1:
The patent applies local quality by differentiating the tensile elastic modulus of bias fibers between the tip-side bias layer and butt-side bias layer. The tip-side bias layer uses fibers with a first tensile elastic modulus optimized for directional stability, while the butt-side bias layer uses fibers with a second tensile elastic modulus optimized for shock absorption. This local differentiation allows each section to perform its specific function optimally without compromising the other.
2Stability of the object's composition
If bias fibers with larger tensile elastic modulus are used to increase torsional rigidity, then trajectory stability during swing is improved, but torsional strength decreases leading to poor durability
Solution Approach 1:
The patent implements local quality by assigning different tensile elastic modulus characteristics to bias fibers in different sections of the shaft. The tip-side bias layer employs fibers with a first tensile elastic modulus that provides adequate torsional rigidity for trajectory stability, while the butt-side bias layer employs fibers with a second tensile elastic modulus that ensures high torsional strength for durability. This localized material property differentiation resolves the contradiction between trajectory stability and durability.
3Stability of the object's composition
If large torsional rigidity is concentrated at the tip end to stabilize head trajectory, then directional stability is improved, but shock absorption at impact deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the bias layer into two distinct sections: a tip-side bias layer and a butt-side bias layer. Each section is independently optimized with different fiber materials having different tensile elastic moduli. The tip-side bias layer is optimized for trajectory stability while the butt-side bias layer is optimized for shock absorption, allowing the shaft to handle both functions effectively.
Solution Approach 2:
The patent implements local quality by creating spatial variation in the material properties of the bias layers. The tip-side region has specific tensile elastic modulus characteristics for trajectory control, while the butt-side region has different characteristics for shock absorption. This local differentiation of material properties enables the shaft to simultaneously achieve trajectory stability and impact shock absorption.
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 improves shock absorption and durability while maintaining directional stability by optimizing the torsional rigidity and strength distribution along the shaft, providing a well-balanced hit ball experience.
Implementation Method 1
bias fibers of the tip-side bias layer has a tensile elastic modulus smaller than that of bias fibers of the butt-side bias layer
Data Source
AI summary
A golf club shaft has a tip end to which a golf club head is attached and a butt end to which a grip is attached, wherein the shaft is composed of a fiber reinforced resin having a fiber layer, the fiber layer contains a bias layer having bias fibers oriented at an angle with respect to an axial direction of the shaft, the bias layer includes a tip-side bias layer extending from the tip end toward the butt end and having a butt-side end terminating without reaching the butt end and a butt-side bias layer extending from the butt end toward the tip end and having a tip-side end terminating without reaching the tip end, and bias fibers in the tip-side bias layer has a tensile elastic modulus smaller than that of bias fibers of the butt-side bias layer.