Compound Bow Limb Preload Angle for Vibration Reduction
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Solution Overview
Problem
High-performance compound bows transfer substantial potential energy to arrows, resulting in harsh recoil and vibrations that interfere with the archer's concentration and accuracy, due to significant energy transfer during arrow acceleration.
Innovation Solution
The bow design significantly reduces limb tip movement by increasing the limb tip angle from unflexed to braced position to 65° or more and limiting the angular change from brace to full draw to 30% or less, providing a highly tensioned system with reduced vibration and 'kick' during shot release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high potential energy is stored in the limbs to deliver substantial energy to the arrow, then energy transfer efficiency is improved, but recoil and vibrations increase causing harsh discharge
Solution Approach 1:
The limbs are pre-loaded to a high degree at brace position, with the limb tip angle set to 65° or more from the unflexed position. This preliminary bending stores a significant portion of the potential energy before the shot, reducing the amount of energy that must be transferred during arrow acceleration, thereby minimizing recoil and vibrations while maintaining high energy transfer efficiency.
Solution Approach 2:
The invention changes the critical parameter of limb tip angle from the conventional less than 40° to 65° or more at brace position. This parameter change fundamentally alters the energy storage characteristics of the limbs, enabling high potential energy storage with reduced movement during discharge, thus resolving the contradiction between energy transfer and recoil reduction.
2Object-generated harmful factors
If the limbs are bent significantly to achieve high brace position flexure, then limb preload is increased reducing vibration and kick, but the structural design becomes more complex
Solution Approach 1:
The invention achieves vibration and kick reduction by changing the limb tip angle parameter to 65° or more at brace position, rather than through complex mechanical structures. This parameter-based solution simplifies the overall design while effectively minimizing harmful vibrations and recoil during discharge.
3Ease of operation
If the limb tip angle from unflexed to braced position is increased to 65° or more, then limb preload increases reducing mass component travel distance, but the manufacturing precision requirements increase
Solution Approach 1:
The invention specifies a limb tip angle of 65° or more at brace position, which significantly reduces the travel distance of mass-bearing components during the shot. While this increases manufacturing precision requirements, the benefit of reduced component travel and improved operational ease justifies the tighter tolerances, particularly in the critical limb tip angle measurement from the unflexed position.
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 configuration results in a calm dynamic response with less vibration and 'kick', maintaining high energy transfer efficiency while minimizing arrow disturbance, enhancing shooting accuracy and comfort.
Implementation Method 1
the limbs are bent significantly to achieve a braced condition of the bow. The result of this significant bending to the brace condition provides a highly tensioned system at brace to produce a very calm dynamic response upon shooting
Data Source
AI summary
A compound archery bow having a riser and first and second limbs secured to and extending from opposite ends of the riser, each limb having an axel to support a wheel or cam; the limbs have a limb tip angle measured from an unstrung or unflexed limb position to a flexed position at brace height of at least 65° and preferably 75° or more. The bow has an axel-to-axel distance percentage change from an unstrung or unflexed condition to a brace condition of at least 20%. The limbs exhibit a limb tip angle percentage change from brace height to full draw condition of 25% or less of the total limb tip change from unflexed to full draw while the limb tip measured from an unstrung condition to a flexed condition at full draw is at least 80° and preferably 100° or more.