Wide String Groove Cam for Archery Bow Noise Reduction
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Solution Overview
Problem
Existing archery bows with rotating members generate noise and vibrations that can alert prey during hunting, compromising the hunting experience.
Innovation Solution
The archery bow design incorporates a rotatable member with a string groove featuring a first depth portion and a second depth portion, where the second depth portion is wider and taller than the first, providing greater lateral clearance and noise reduction by containing the bowstring effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional string groove design is used in the rotatable member, then the structure is simple, but noise and vibrations are generated that can alert prey
Solution Approach 1:
The string groove is designed with varying depth along its path - a first depth portion and a second depth portion - creating different local geometries to optimize string containment at different locations. This local variation in groove depth reduces noise and vibrations while maintaining structural simplicity
Solution Approach 2:
The invention introduces a depth dimension variation to the string groove, transitioning from a uniform two-dimensional groove to a three-dimensional groove with varying depths. This dimensional change allows for better string containment and noise reduction without significantly increasing overall structural complexity
2Object-affected harmful factors
If the string groove has uniform depth, then the manufacturing is simple, but the bowstring is not contained effectively leading to noise
Solution Approach 1:
The string groove features a first depth portion and a second depth portion with different depths, creating local quality variations that improve string containment. The shallower first depth portion and deeper second depth portion work together to reduce noise while the geometry can be manufactured using standard machining processes
3Object-affected harmful factors
If the rotatable member uses a wider string groove, then noise is reduced through better containment, but the size of the rotatable member increases
Solution Approach 1:
Instead of uniformly increasing the groove width across the entire rotatable member, the invention uses localized depth variations in the string groove. This approach contains the bowstring effectively to reduce noise while minimizing the overall size increase of the rotatable member
Solution Approach 2:
The invention addresses noise reduction by utilizing the depth dimension of the groove rather than only increasing width. This allows for effective string containment and noise reduction while keeping the rotatable member compact
Data Source
AI summary
In some embodiments, an archery bow rotatable member comprises a body arranged to rotate about an axis and a string groove extending around a perimeter of the body. The string groove comprises a first depth portion and a second depth portion. The first depth portion comprises a valley and defines a first width. The second depth portion is oriented above the first depth portion. The second depth portion comprises opposed parallel sidewalls that define a second width greater than the first width.