Golf Club Head Face Geometry for Off-Center Gear Effect
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Solution Overview
Problem
Golf clubs, particularly wood-type clubs, often perform poorly with off-center impacts due to gear effect, which causes spin-induced trajectory deviations, and existing designs fail to adequately address this issue for a wide range of golfer skill levels.
Innovation Solution
A golf club head with a striking face featuring varying bulge and roll radii across different regions, designed to minimize gear effect by optimizing loft and roll characteristics for off-center impacts, thereby improving distance and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the club face is designed with uniform bulge and roll to maximize ideal impact performance, then distance and accuracy at face center are optimized, but off-center impact performance deteriorates due to unmitigated gear effect
Solution Approach 1:
The club face is divided into multiple regions (heel region, toe region, center region) with different bulge and roll characteristics. The heel region has different curvature properties than the toe region, allowing each area to be optimized for its specific impact characteristics while working together to minimize gear effect across the entire face.
Solution Approach 2:
The striking face is segmented into distinct zones with varying geometric properties. By segmenting the face and assigning different bulge/roll characteristics to different segments, the design can address the specific needs of heel, center, and toe impact areas separately while achieving overall gear effect reduction.
2Adaptability or versatility
If the club face curvature is increased to reduce gear effect, then off-center impact accuracy improves, but the club face complexity and manufacturing difficulty increase
Solution Approach 1:
The design systematically varies geometric parameters (bulge radius, roll radius) across different regions of the club face. By changing these parameters in a controlled manner rather than using uniform or highly complex geometries, the design achieves gear effect reduction while maintaining manufacturability through standardized forming processes.
3Adaptability or versatility
If the loft is varied across the club face to compensate for off-center impacts, then shot dispersion is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
Different loft angles are assigned to different regions of the club face (heel, center, toe). This local variation in loft allows compensation for off-center impacts without requiring extreme precision throughout the entire face, as each region's loft is optimized for its specific impact characteristics.
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 golf club head reduces gear effect, resulting in improved shot dispersion and straighter shots for both high-toe and low-heel impacts, enhancing performance for a variety of golfer skill levels.
Implementation Method 1
When a golf ball is struck off-center, the clubface tends to impart spin on a golf ball in a direction opposite to the direction of the off-center impact on the clubface. Such an effect is commonly referred to as 'gear effect'. Gear effect occurs due to the curvature of the clubface and the resulting interaction between the clubface and the golf ball during impact.
Data Source
AI summary
A golf club head includes a volume greater than 400 cubic centimeters, a crown portion, a sole portion opposite the crown portion, a toe portion, a heel portion portion opposite the toe portion, and a striking face. The striking face includes a face center, a first point located laterally toe-ward from the face center by a first distance D1 between 25 mm and 35 mm, the first point associated with a first loft, a first bulge radius, and a first roll radius, and a second point located laterally heel-ward from the face center by the first distance D1, the second point associated with a second loft that is less than the first loft by at least 0.5 degrees, a second bulge radius that is within 0.2 in of the first bulge radius, and a second roll radius that is within 0.2 in of the first roll radius.