Double-Sided Chain Layout for Higher Torque at Constant Speed
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Solution Overview
Problem
Existing mechanical systems with chain transmissions fail to achieve higher torque on the driven wheel while maintaining the same rotational speed of the driven and driving wheels.
Innovation Solution
A mechanical system with a double-sided chain, comprising a driving wheel, a tensioner wheel, and a driven wheel, where the wheel centers are not collinear, and the tensioner wheel's position determines the optimal angle between the force vector and the chain's operation line, with specific geometrical relationships and link designs to enhance torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional chain transmission with collinear wheel centers is used, then the structure is simple and easy to manufacture, but the torque on the driven wheel cannot be increased while maintaining the same rotational speed
Solution Approach 1:
The patent applies asymmetry by positioning the wheel centers in a non-collinear arrangement, specifically with the driven wheel center offset from the line connecting the driving and tensioner wheel centers. This asymmetric geometry creates a mechanical advantage that increases torque transmission to the driven wheel while maintaining the same rotational speed, directly resolving the contradiction between increased force and acceptable device complexity.
Solution Approach 2:
The invention transitions from a one-dimensional collinear arrangement of wheel centers to a two-dimensional non-collinear configuration. By introducing spatial offset in the perpendicular dimension, the system achieves enhanced torque transmission through optimized force vector alignment without significantly increasing overall structural complexity.
2Force
If the wheel centers are positioned non-collinearly with specific angle optimization, then the torque transmission is enhanced, but the manufacturing and alignment precision requirements increase
Solution Approach 1:
The patent optimizes specific geometric parameters including the angle alpha (15 degrees) between the force vector and the line perpendicular to the straight line joining the tensioner and driven wheel centers, and the angle beta (105 degrees) of the chain wrap around the driven wheel. These precisely defined parameter values maximize force transmission efficiency while providing clear manufacturing specifications that balance precision requirements with manufacturability.
3Productivity
If the chain links are shaped with specific geometrical relationships and double-sided teeth, then the torque transmission is optimized, but the manufacturing complexity of the chain increases
Solution Approach 1:
The chain is segmented into distinct functional components: driving links with teeth for engaging the driving wheel, leading links with smooth surfaces for the tensioner wheel, and coupling elements. Each segment is designed with specific geometrical characteristics optimized for its function, allowing standardized manufacturing processes for each component type while achieving overall system optimization for power transmission.
Solution Approach 2:
Different portions of the chain links exhibit different geometric qualities tailored to their specific functions. The driving links feature teeth with specific profiles for optimal engagement with the driving wheel, while leading links have smooth surfaces for the tensioner wheel. This local differentiation of quality maximizes power transmission efficiency while enabling specialized manufacturing techniques for each link type.
Data Source
AI summary
A mechanical system with a double-sided chain, composed of a driving wheel (S1), a tensioner wheel (S2) for the chain (1), a driven wheel (S3) and a chain (1), which winds around the wheels (S1) and (S2), and engages the wheel (S3) on its outer side, characterized in that the wheel centres (S1), (S2) and (S3) are not collinear, whereas the position of wheel axis (S2) in relation to wheel axis (S1) and (S3) determines the line of operation of chain (1) and determines the optimal angle alpha between the direction of the force vector F and the perpendicular to the straight line joining the centres of tensioner wheel (S2) and driven wheel (S3), and passing through point (B) where force F1 is applied. while the value of the angle alpha is equal 15 degrees.