Decoupled Synchronizing Pulley for Compound Archery Bow
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Solution Overview
Problem
Conventional compound archery bow pulley assemblies are constrained to move in unison, leading to inherent leaning moments and twisting forces, which can cause tilting and discomfort during shooting, and lack decoupling of synchronizing components from string and cable pulley components.
Innovation Solution
The pulley assembly features synchronizing components that are decoupled from the string and cable pulley components, with integral axles journal-mounted in bushing or bearing assemblies, allowing independent rotation of the synchronizing pulley elements, reducing tilting and twisting forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If synchronizing components are integral with string and cable pulley components, then the pulley assembly structure is simplified, but tilting and twisting forces increase causing discomfort
Solution Approach 1:
The pulley assembly is segmented into distinct components: string and cable pulleys remain integral with the axle, while the synchronizing pulley is decoupled and mounted independently on the limb. This segmentation allows the synchronizing pulley to rotate independently without being constrained by the motion of the string and cable pulleys, thereby eliminating tilting and twisting forces while maintaining structural simplicity.
2Stability of the object's composition
If pulley assemblies are constrained to move in unison, then synchronization is achieved, but leaning moments and twisting forces are generated
Solution Approach 1:
A separate synchronizing cable acts as an intermediary mechanism between the two pulley assemblies. This cable connects the synchronizing pulleys of opposite limbs and transmits rotational motion independently from the string and cable pulleys. The intermediary synchronizing cable enables synchronized movement of both limbs without requiring the pulley assemblies to move in unison through rigid constraints, thereby eliminating leaning moments and twisting forces.
3Object-affected harmful factors
If synchronizing components are decoupled from string and cable pulley components, then tilting and twisting forces are reduced, but the device complexity increases
Solution Approach 1:
The synchronizing pulley is merged with the limb structure through independent mounting, rather than being integrated with the moving pulley assembly. This merging approach allows the synchronizing component to function independently while simplifying the overall structure by eliminating the need for complex decoupling mechanisms. The synchronizing cable connects the two limbs, providing synchronization without adding significant complexity to individual pulley assemblies.
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 design significantly reduces the annoyance caused by tilting and enhances the stability of the pulley assembly by allowing independent angular displacement of synchronizing components, improving the shooting experience and reducing twisting moments.
Implementation Method 1
journal-mounted in bushing or bearing assemblies, allowing independent rotation of the synchronizing pulley elements, reducing tilting and twisting forces
Data Source
AI summary
A rigging structure for a compound archery bow includes first and second pulley assemblies, pivotally mounted on axles at tips of corresponding first and second limbs of a compound bow and interconnected by cables. Each pulley assembly includes a dynamic synchronizing component, decoupled from the string and cable pulley components of the assembly.