Golf Club Head Mass Distribution for Forgiveness and Squaring
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Solution Overview
Problem
Conventional golf club heads with high moments of inertia (Izz) for increased forgiveness tend to be bulky, making it difficult for golfers to square the club face, thereby reducing the effectiveness of the high forgiveness.
Innovation Solution
A golf club head design with a cooperative combination of moments of inertia about respective axes, featuring a body with a forward portion and a rearward portion, and strategically positioned localized mass elements to enhance the moment of inertia about the x-axis (Ixx) while maintaining a high moment of inertia about the z-axis (Izz), thus achieving improved forgiveness without increasing bulkiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the moment of inertia about the z-axis (Izz) is increased to improve forgiveness on off-center impacts, then the golf club head becomes bulkier, making it more difficult for golfers to square the club face
Solution Approach 1:
The patent applies local quality by strategically positioning discrete mass elements at specific locations within the club head body rather than uniformly distributing mass throughout. This allows the moment of inertia about the z-axis (Izz) to be increased at specific critical areas while maintaining a streamlined overall club head shape that does not impede the golfer's ability to square the club face. The mass elements are placed to maximize their contribution to Izz while minimizing their impact on the club head's rotational characteristics about the shaft axis.
2Reliability
If the moment of inertia about the z-axis (Izz) is increased to reduce ball speed-loss on off-center shots, then the club head geometry becomes more constrained by USGA regulations
Solution Approach 1:
The patent segments the club head mass distribution by incorporating discrete, localized mass elements within the club head body rather than relying on a monolithic club head geometry. This segmentation allows the design to achieve high Izz values while maintaining compliance with USGA regulations on club head size and shape. The mass elements can be independently positioned and sized to optimize ball speed consistency on off-center shots without violating regulatory constraints on overall club head dimensions.
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 achieves increased forgiveness on high, low, heel, and toe off-center impacts without negatively impacting the golfer's ability to square the club head, thereby maintaining the benefits of high Izz while improving playability.
Implementation Method 1
A moment of inertia is the measure of a club head's resistance to twisting upon impact with a golf ball. Generally, the higher the moments of inertia of a golf club head, the less the golf club head twists at impact with a golf ball, particularly during 'off-center' impacts with a golf ball.
Implementation Method 2
The moment of inertia about a golf club head center of gravity x-axis generally parallel to the origin x-axis is between about 280 kg·mm2 and about 400 kg·mm2. The moment of inertia about a golf club head center of gravity y-axis generally parallel to the origin y-axis is between about 280 kg·mm2 and about 400 kg·mm2.
Data Source
AI summary
Disclosed herein are various embodiments of a golf club head having improved mass distribution characteristics. The golf club head includes a body and a face positioned at a forward portion of the body. The golf club head also includes one or more mass elements positioned at predetermined locations about the head. The mass elements assist in achieving a desired relationship between the moment of inertia about a center of gravity x-axis and the moment of inertia about a center of gravity z-axis.