Compound Bow Cam Module Draw Length Adjustment
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Solution Overview
Problem
Conventional compound bows face challenges in maintaining stability and arrow accuracy due to the need for adjusting the draw length of the bowstring at the let-off state, which can lead to distortion of the bow limbs and inconsistent power delivery.
Innovation Solution
The design incorporates upper and lower pulley assemblies with cam modules that allow for adjustable draw length by winding cam cables around cams, using a fixing unit to secure the cam module at a desired position, and a compensating projection to maintain constant tension and reduce limb twisting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the draw length of the bowstring is adjusted by conventional means, then the draw length can be changed for different users, but the bow limbs become distorted and the power delivery becomes inconsistent
Solution Approach 1:
The cam assembly is divided into a stationary cam portion and a movable cam portion that can be independently adjusted. The movable cam portion includes a cam module that can be positioned at different locations on the cam cable, allowing draw length adjustment without affecting the overall structural integrity of the bow limbs.
Solution Approach 2:
The cam module is designed to be movable along the cam cable and can be fixed at different positions. This dynamic adjustment mechanism allows the draw length to be changed while maintaining proper alignment and tension distribution, preventing bow limb distortion.
2Power
If the draw length is increased for skilled users, then the shooting power is improved, but the bow structure becomes less stable
Solution Approach 1:
The movable cam module acts as an intermediary between the bowstring and the cam cables. By adjusting the position of this intermediate component, the draw length can be extended for increased power while the cam module maintains proper tension distribution, preserving structural stability.
3Reliability
If a fixed cam structure is used, then the bow maintains consistent power delivery, but the draw length cannot be adjusted for different users or skill levels
Solution Approach 1:
The cam module is designed with movable and fixed characteristics - it can be positioned at different locations to adjust draw length, and once positioned, it maintains a fixed relationship with the cam cable to ensure consistent power delivery. This combines adaptability with reliability.
4Length of moving object
If the cam module is moved to adjust draw length, then the draw length changes, but the cam cable tension becomes inconsistent
Solution Approach 1:
The cam module design inherently provides feedback mechanisms through its geometric relationship with the cam cable. As the cam module moves to different positions, the cam profile geometry automatically adjusts the cable tension to maintain consistency across different draw lengths.
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
This solution enables easy adjustment of the draw length while maintaining consistent power and minimizing bow limb twisting, thereby improving stability and accuracy of the arrow shot.
Implementation Method 1
the respective cams each comprise a cam cable support portion on which to support the cam cable; a cam module which rotates around a pivot point at a position spaced apart from the rotating shaft of the pulley to which the cams are coupled
Implementation Method 2
the cam cable is supported on the cam cable support portion and then is wound on the outer circumferential surface of the cam module
Data Source
AI summary
Provided is a compound bow comprising: a bow main body; upper and lower pulley assemblies; a bowstring; and first and second cam cables, wherein at least one of the first and second cam cables is coupled to the fixing projection that moves along as a cam module moves, is wound on a cam cable winding portion via a compensation projection, and then extends toward the other side pulley assembly, and a front portion of the cam module is in contact with the one cam cable and thus the one cam cable is bent when the cam module is moved, to thus release the one cam cable from the cam cable winding portion via the compensating projection from the fixing projection that the one cam cable is coupled, to thereby maintain constant tension of the cam cable and keep the power of the bow.