Golf Club Head Adherend Joining Strength and Vibration Damping
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Solution Overview
Problem
Golf club heads face challenges with adherends coming off due to impact shock and require improved durability and vibration absorptivity, while maintaining design freedom and material selection, but existing solutions struggle with joining strength between multiple members.
Innovation Solution
A golf club head design featuring a cast resin adherend with a metal part and vibration absorber, where the cast resin has a formed surface and a thin-walled part with a thickness of 2.5 mm or less, and the vibration absorber is exposed, providing high joining strength and durability through a combination of materials and surface forming layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple members are combined to create an adherend with diverse functions and material options, then design freedom and material selection are improved, but joining strength between members deteriorates
Solution Approach 1:
The patent merges multiple members (metal part, vibration absorber, cast resin) into a single integrated adherend structure. The metal part and vibration absorber are positioned within the cast resin to form one unified component that is then bonded to the head body, eliminating the need for multiple separate bonding operations and ensuring consistent joining strength across all functional elements.
Solution Approach 2:
The adherend is constructed as a composite structure combining different materials: a metal part for structural integrity, a vibration absorber for shock mitigation, and cast resin for bonding and encapsulation. This composite approach allows each material to contribute its superior properties while forming a unified structure with consistent bonding characteristics.
2Weight of moving object
If the cast resin thickness is reduced to 2.5 mm or less, then weight is reduced and vibration absorption is improved, but structural strength deteriorates
Solution Approach 1:
The cast resin is strategically positioned only where needed - between the metal part/vibration absorber and the head body bonding surface. This localized placement eliminates unnecessary resin material while maintaining sufficient bonding strength at the critical interface, achieving weight reduction without compromising structural integrity.
Solution Approach 2:
The adherend structure segments the cast resin into a thin bonding layer rather than using a thick uniform layer. The metal part and vibration absorber provide the primary structural function, while the cast resin serves specifically as a bonding medium, allowing thickness optimization for weight reduction while maintaining bonding strength.
3Reliability
If a vibration absorber is added to the adherend, then vibration absorption capability is improved, but device complexity increases
Solution Approach 1:
The vibration absorber is merged with the metal part to form an integrated sub-assembly that is then positioned within the cast resin. This merging approach adds vibration absorption functionality while minimizing the increase in overall structural complexity by combining elements into unified components rather than adding separate discrete parts.
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 solution achieves high joining strength and excellent durability of the adherend, ensuring it remains attached to the head body even under impact, while allowing for effective vibration absorption and weight reduction.
Implementation Method 1
The adherend has a cast resin formed by casting, a metal part, and a vibration absorber. The cast resin has a formed surface formed by the metal part.
Implementation Method 2
a function such as impact absorptivity may be added to the adherend
Data Source
AI summary
A head 1 is provided with a head body h1 and an adherend s1. The adherend s1 has a cast resin 53 formed by casting, a metal part 51, and a vibration absorber 55. The cast resin 53 has a formed surface formed by the metal part 51. The cast resin 53 further may have a formed surface formed by the vibration absorber 55. A base material of the cast resin 53 is an epoxy resin, for example. The cast resin 53 may have a cutting surface PL1. The cutting surface PL1 may be a joint surface of the adherend to the head body h1. Preferably, a loss tangent tan δ of the vibration absorber 55 is 0.07 or greater and 0.25 or less.