Composite Golf Club Shaft Structure for Stability and Vibration Damping
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Solution Overview
Problem
Existing golf club shafts lack stability and consistency during a golf swing, affecting performance.
Innovation Solution
A golf club shaft design comprising a first tubular portion made of high-strength, malleable metal and a second tubular portion made of composite material with high stiffness-to-weight ratio, incorporating a spacer for smooth transition and sound/vibration dampening, and optionally reinforced with metal for enhanced stability and feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a golf club shaft is made from a single material, then manufacturing is simple, but stability and consistency during swing are insufficient
Solution Approach 1:
The golf club shaft is constructed as a composite structure with a first tubular portion made of metal and a second tubular portion made of composite material. This combination leverages the strength and malleability of metal along with the high stiffness-to-weight ratio of composite materials to achieve superior stability and consistency during the golf swing, directly resolving the technical contradiction between reliability and structural simplicity.
Solution Approach 2:
The shaft is divided into two distinct tubular portions with different materials and properties. The first tubular portion (metal) and second tubular portion (composite) are coupled together, allowing each segment to contribute its optimal characteristics to the overall shaft performance, thereby improving stability without requiring complete structural redesign.
2Reliability
If the shaft is made stiffer for better control, then consistency improves, but vibrations increase affecting feel
Solution Approach 1:
A spacer is introduced as an intermediary element between the first and second tubular portions. This spacer provides a smooth transition zone and acts as a vibration dampener, allowing the stiff composite portion to provide consistency while the spacer absorbs and reduces unwanted vibrations, thus resolving the contradiction between consistency and harmful vibrations.
Solution Approach 2:
The design accepts that stiffer materials generate vibrations but converts this harmful effect into a benefit by strategically placing the spacer to dampen these vibrations. The vibrations generated by the stiff composite section are transformed into controlled energy dissipation through the spacer, improving overall shaft performance and feel.
3Weight of moving object
If composite material is used for high stiffness-to-weight ratio, then weight is reduced, but transition between materials creates discontinuity
Solution Approach 1:
The spacer serves as a transition intermediary between the metal first tubular portion and the composite second tubular portion. It provides a smooth geometric and mechanical transition that eliminates discontinuities, ensuring stable stress distribution while maintaining the weight benefits of the composite material. This resolves the contradiction between weight reduction and compositional stability.
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 improved stability and consistency, enhancing the overall performance of the golf club shaft by increasing stiffness and reducing vibrations.
Implementation Method 1
incorporating a spacer for smooth transition and sound/vibration dampening
Data Source
AI summary
Examples of golf club shafts and methods to manufacture golf club shafts are generally described herein. In one example, a golf club shaft includes a first tubular portion coupled to a second tubular portion. The second tubular portion includes a plurality of materials and is defined by a first length having a first uniform outer diameter, a second length having a variable outer diameter, and a third length having a second uniform outer diameter different from the first uniform outer diameter. The second length is located between the first length and the third length. A total length of the second tubular portion is greater than a total length of the first tubular portion. Other examples and examples may be described and claimed.