Multi-Piece Golf Club Head With High-Durability Adhesive Joints
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Solution Overview
Problem
Conventional multi-piece golf club heads face challenges in maintaining strong and durable bonds between pieces, leading to degradation and reduced performance due to high impact forces during ball strikes, while welding limits discretionary mass distribution.
Innovation Solution
A golf club head constructed with multiple pieces adhesively bonded together, featuring a hollow interior cavity defined by multiple pieces with optimized bond areas and materials, including non-metallic and metallic components, and laser-ablated faying surfaces for enhanced adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding is used to bond pieces of multi-piece golf club heads, then bond strength and durability are improved, but discretionary mass distribution is limited due to higher mass of metallic materials
Solution Approach 1:
The patent changes the bonding method from welding to adhesive bonding, which allows the use of non-metallic materials with lower density. This parameter change in the bonding process enables reduced mass while maintaining bond strength, thereby increasing discretionary mass for performance optimization.
Solution Approach 2:
The patent employs composite materials including non-metallic materials (such as carbon fiber reinforced polymers) combined with metallic materials. This composite approach allows achieving required strength and stiffness with lower mass, enabling better discretionary mass distribution throughout the club head.
2Weight of moving object
If adhesive bonding is used to construct multi-piece golf club heads, then discretionary mass distribution is improved, but bond durability under high impact forces deteriorates
Solution Approach 1:
The patent increases the bond area between pieces by utilizing multi-dimensional bonding surfaces. By expanding the bonding interface across multiple surfaces and orientations, the adhesive bond can withstand high impact forces better, compensating for the generally lower strength of adhesive bonding compared to welding.
Solution Approach 2:
The patent optimizes adhesive bonding parameters including bond area, adhesive material properties, and bonding surface preparation. By changing these parameters, particularly increasing bond area and selecting appropriate adhesive formulations, the durability of adhesive bonds under high impact conditions is significantly improved.
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 provides a durable and strong bond between pieces, maintaining performance over time and allowing for discretionary mass distribution, thus enhancing the club's durability and performance.
Implementation Method 1
a second piece, adhesively bonded to the first piece along a first bonded joint
Implementation Method 2
laser-ablated faying surfaces for enhanced adhesive strength
Data Source
AI summary
A golf club head that comprises a hollow interior cavity, a first piece, a second piece, adhesively bonded to the first piece along a first bonded joint, a third piece, adhesively bonded to the first piece along a second bonded joint, and a fourth piece, adhesively bonded to the first piece along a third bonded joint. A volume of the golf club head is at least 120 cubic centimeters (cc) and at most 600 cc. The first bonded joint has a first-joint bond area. The second bonded joint has a second-joint bond area. The third bonded joint has a third-joint bond area. A summation of the first-joint bond area, the second-joint bond area, and the third-joint bond area is at least 1,950 mm2 and at most 3,400 mm2.