Bow Cable With Segmented Elasticity To Reduce Slippage
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Solution Overview
Problem
In traditional bows where cables are elastically deformed to shoot arrows, slippage between the cables and cable cams leads to friction loss and reduced arrow distance, as the cables are often deformed at the wound portions, causing energy loss.
Innovation Solution
The use of a cable configuration featuring a combination of high-elasticity and low-elasticity raw threads, where the low-elasticity thread connects high-elasticity threads wound around cable cams, allowing for efficient elastic deformation and reducing slippage, with connection pins to manage thread tension and prevent winding around cams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the cable is wound around the cable cam and elastically deformed at the wound portion, then the cable can be pulled and rotated, but slippage occurs between the cable and cable cam causing friction loss and energy loss
Solution Approach 1:
The cable is segmented into multiple strands (first cable strand, second cable strand, third cable strand) with different elasticities. The low-elasticity third cable strand is positioned away from the cable cam to prevent slippage, while the high-elasticity first and second cable strands are wound around the cable cam to enable rotation. This segmentation resolves the contradiction by separating the functions of preventing slippage and enabling elastic deformation.
Solution Approach 2:
Different portions of the cable have different elastic properties. The third cable strand has low elasticity and is positioned at specific locations (away from the cable cam) to prevent slippage, while the first and second cable strands have high elasticity and are wound around the cable cam to enable rotation. This local differentiation of material properties resolves the contradiction between preventing slippage and enabling elastic deformation.
2Force
If the cable is elastically deformed at the portion wound around the cable cam, then the cable can generate elastic force, but the cable slips on the cable cam reducing arrow distance
Solution Approach 1:
The cable is divided into multiple strands with different functions. The high-elasticity first and second cable strands provide the elastic force needed for arrow propulsion when wound around the cable cam, while the low-elasticity third cable strand prevents slippage by being positioned away from the cam. This segmentation ensures both force generation and operational effectiveness.
Solution Approach 2:
The low-elasticity third cable strand acts as an intermediary element that prevents direct slippage between the high-elasticity strands and the cable cam. It maintains the positional relationship between the cable and cam while allowing the high-elasticity strands to deform and generate force, thus mediating between force generation and slippage prevention.
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 minimizes slippage and friction, enhancing the conversion of string drawing motion into arrow propulsion, allowing the arrow to fly further by efficiently transferring rotational energy into elastic deformation.
Implementation Method 1
the low-elasticity raw thread being elastically deformed more easily than the first high-elasticity raw thread and the second high-elasticity raw thread
Implementation Method 2
the first high-elasticity raw thread wound around one of the pair of cable cams; a second high-elasticity raw thread wound around the other of the pair of cable cams
Data Source
AI summary
A cable tensed between a pair of large and small diameter cams of a bow and elastically deformed to generate an elastic force for rotating the pair of large and small diameter cams and a pair of string cams rotated integrally with the pair of large and small diameter cams in a reverse direction when the string is drawn to rotate the pair of large and small diameter cams are rotated. The cable has: a first high-elasticity raw thread wound around one of the pair of large and small diameter cams; a second high-elasticity raw thread wound around the other of the pair of large and small diameter cams; and a low-elasticity raw thread which connects the first high-elasticity raw thread with the second high-elasticity raw thread, the low-elasticity raw thread being elastically deformed more easily than the first high-elasticity raw thread and the second high-elasticity raw thread.