Deflector Assembly for Variable Ratio Transmission
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Solution Overview
Problem
Existing variable ratio transmissions (VRTs) face inefficiencies, complexity, limited torque, and restricted range of ratios, making them unsuitable for applications requiring high torque at low speeds and free movement, such as robotics and active orthotics.
Innovation Solution
A technique involving the variable deflection of actuator belts to achieve a load-dependent or control-system-adjusted deflection distance, allowing for the construction of actuators and transmissions that can supply high torque at low speeds and smaller forces at higher speeds, using mechanisms like cam followers and externally controllable mechanisms to set the ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional CVTs are used to achieve variable ratio transmission, then the ability to deliver high torque at low speed is improved, but the complexity of the device increases and efficiency decreases
Solution Approach 1:
The transmission system is divided into discrete gear positions (first gear position, second gear position, etc.) rather than continuous variation. The deflector moves between specific positions to engage different gear ratios, simplifying the mechanism compared to continuous CVTs while still providing variable torque multiplication.
Solution Approach 2:
The deflector is made movable between different positions to dynamically change the gear ratio. The deflector can shift between first and second positions to engage different gear sets, allowing the transmission ratio to vary based on operational requirements while maintaining mechanical simplicity.
2Adaptability or versatility
If conventional CVTs are used to achieve variable ratio transmission, then the range of possible ratios is improved, but the efficiency of the system worsens
Solution Approach 1:
The continuous ratio range is segmented into discrete gear positions. Instead of allowing continuous belt movement on conical pulleys, the system provides specific gear ratios at defined positions, reducing energy loss from continuous friction while maintaining adaptability across multiple transmission ratios.
Solution Approach 2:
The patent replaces the friction-based continuous variable transmission mechanism with a mechanical engagement system using gear sets and a movable deflector. This substitution eliminates the sliding friction losses inherent in conventional CVTs while providing multiple discrete ratio options.
3Adaptability or versatility
If conventional CVTs are used to achieve variable ratio transmission, then the ability to adjust transmission ratio is improved, but the maximum torque capability worsens
Solution Approach 1:
The patent combines multiple gear sets with different ratio characteristics into a single transmission system. The first gear set provides one ratio range while the second gear set provides another, and the movable deflector allows seamless transition between them, achieving both wide ratio adjustment and high torque capability by merging multiple mechanical advantage paths.
Data Source
AI summary
A technique for deflecting an actuator belt includes applying a variable deflection force to the actuator belt. The technique may be used to construct actuators for active orthotics, robotics or other applications. Versions with passive clutches may also be used to construct variable-ratio motor gearheads, or may be scaled up to build continuously variable transmissions for automobiles, bicycles, or other vehicles.