Golf Club Shaft Rigidity Profile for Stable High-Speed Swings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The performance of golf club shafts can vary significantly due to variations in flexural and torsional rigidity along the shaft, affecting swing stability and hitting results, particularly for golfers with high head speeds.
Innovation Solution
A golf club shaft design with specific ratios of flexural rigidity (E10/E1) and torsional rigidity (G1) at defined points along the shaft, utilizing fiber reinforced resin layers with controlled fiber orientation angles and layer configurations to enhance stability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the flexural rigidity is increased throughout the shaft to improve swing stability, then swing stability improves, but the shaft becomes difficult to swing and head speed decreases
Solution Approach 1:
The shaft applies different flexural rigidity characteristics to different sections: the tip portion (0-400mm from tip) has lower flexural rigidity (EI≤2.5) to maintain flexibility and head speed, while the butt portion (600-1000mm from tip) has higher flexural rigidity (EI≥6.0) to provide swing stability. This local differentiation resolves the contradiction by allowing each section to optimize for its specific function.
Solution Approach 2:
The shaft design creates a dynamic flexural rigidity distribution where the ratio E10/E1 is controlled between 2.4-8.0, allowing the shaft to exhibit different stiffness characteristics during different phases of the swing. The lower rigidity at the tip allows for dynamic bending and energy storage, while the higher rigidity at the butt provides stability during the swing transition.
2Stability of the object's composition
If the torsional rigidity is increased to reduce shaft twisting on impact, then shaft twisting is reduced, but the shaft feels less responsive and swing feel deteriorates
Solution Approach 1:
The shaft applies different torsional rigidity characteristics to different sections: the tip portion has lower torsional rigidity (G1≥0.5 with E1/G1≤4.0) to maintain responsiveness and swing feel, while providing sufficient torsional control to prevent excessive twisting on impact. The butt portion has higher torsional rigidity to stabilize the shaft during the swing.
3Stability of the object's composition
If the flexural rigidity ratio E10/E1 is increased to improve swing stability, then swing stability improves, but the shaft becomes too stiff and responsiveness decreases
Solution Approach 1:
The patent precisely controls the flexural rigidity ratio parameter E10/E1 within the range of 2.4-8.0, along with absolute values (E1≤2.5, E10≥6.0). This parameter optimization ensures the shaft achieves sufficient swing stability while maintaining responsiveness. The upper limit of 8.0 prevents the shaft from becoming too stiff, preserving the feedback and feel golfers need.
Data Source
AI summary
A shaft includes a tip end and a butt end. In the shaft, a flexural rigidity at a point located 130 mm apart from the tip end is denoted by E1, a flexural rigidity at a point located 1030 mm apart from the tip end is denoted by E10, and a torsional rigidity at the point located 130 mm apart from the tip end is denoted by G1. A ratio (E10/E1) is greater than or equal to 2.4 and less than or equal to 8. The flexural rigidity E1 is less than or equal to 2.5 (kgf·m2). The flexural rigidity E10 is greater than or equal to 6.0 (kgf·m2). The torsional rigidity G1 is greater than or equal to 0.5 (kgf·m2). A ratio (E1/G1) is greater than or equal to 1.0 and less than or equal to 4.0.