Golf Club Head Mass Layout for Centered CG and Forgiveness
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Solution Overview
Problem
Existing golf club heads, particularly player irons and wedges, face challenges in aligning the center of gravity with the striking face while maintaining a traditional appearance and enhancing forgiveness on off-center hits, often compromising sweet spot location and backspin characteristics.
Innovation Solution
A golf club head design that incorporates a low-density ceramic insert within the hosel and heel portion, repositioning mass to move the center of gravity closer to the striking face, increasing moments of inertia (Iyy and Izz) without altering the traditional look, using a combination of materials with different densities and melting points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If perimeter weighting is added to increase moments of inertia for forgiveness, then off-center hit forgiveness is improved, but the traditional appearance is lost and sweet spot location deteriorates
Solution Approach 1:
The weight redistribution is achieved through discrete components: a heel portion weight and a hosel portion weight, rather than perimeter weighting. This segmentation allows selective placement of mass to achieve forgiveness without the visual characteristics of perimeter-weighted clubs.
Solution Approach 2:
Weight is concentrated in specific local regions (heel portion and hosel portion) rather than distributed around the perimeter. This local quality approach maintains the traditional blade appearance while providing forgiveness through strategic mass placement that increases moments of inertia.
2Measurement precision
If weight is moved to adjust center of gravity position, then shot accuracy is improved, but the traditional appearance and sweet spot location may be affected
Solution Approach 1:
Weight is concentrated in specific local regions (heel portion and hosel portion) rather than distributed around the perimeter. This local quality approach maintains the traditional blade appearance while providing forgiveness through strategic mass placement that increases moments of inertia.
3Power
If mass is redistributed to center the center of gravity, then energy transfer is improved, but manufacturing complexity increases
Solution Approach 1:
The weight redistribution is achieved through discrete components: a heel portion weight and a hosel portion weight, rather than perimeter weighting. This segmentation allows selective placement of mass to achieve forgiveness without the visual characteristics of perimeter-weighted clubs.
Solution Approach 2:
The club head incorporates weights made of different materials (e.g., tungsten, stainless steel) with varying densities to achieve precise mass distribution. This composite material approach allows fine-tuning of center of gravity position and moment of inertia while maintaining manufacturing feasibility.
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 effectively centers the center of gravity, enhances forgiveness, and maintains the traditional appearance by discreetly redistributing mass, improving shot accuracy and energy transfer while maintaining desirable spin characteristics.
Implementation Method 1
a low-density ceramic insert within the hosel and heel portion, repositioning mass to move the center of gravity closer to the striking face, using a combination of materials with different densities
Implementation Method 2
increasing moments of inertia (Iyy and Izz) without altering the traditional look
Data Source
AI summary
A golf club head includes a striking face having a face center and defining a face plane, a virtual vertical center plane perpendicular to the face plane and passing through the face center, a sole portion, a top portion, a heel portion, a toe portion, a hosel configured to receive a shaft, and a loft, L, no less than 39°. A center of gravity is spaced from the vertical center plane by a distance, D7. A moment of inertia, Iyy, is measured about an axis extending in a heel to toe direction, parallel with a ground plane, and passes through the center of gravity, such that Iyy/D7≥527.4 g·cm/°×L−23,580 g·cm.