Compact CVT with Variable Cam for Torque Adaptation
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Solution Overview
Problem
Conventional continuously variable transmission systems are not compact enough to automatically adjust torque in response to varying loads on the output shaft, leading to potential damage to motors or engines and inefficient power transfer.
Innovation Solution
A compact continuously variable transmission apparatus featuring an input shaft, driven gears with phase differences, a variable cam with adjustable rotation radius, a one-direction clutch, cam shafts, and output links with a reaction apparatus to manage torque based on load changes, allowing for bidirectional rotational force transfer and efficient speed adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional non-stage transmission using a lever crank mechanism is used, then the driving force transfer system can be simplified, but the system produces more vibrations and noises
Solution Approach 1:
The patent employs asymmetric arrangement of driven gears around the input shaft with specific phase differences, and asymmetric positioning of cam shafts and output links. This asymmetric configuration balances the vibrational forces and reduces noise while maintaining simplified driving force transfer, directly resolving the contradiction between system simplicity and vibration/noise reduction.
2Reliability
If the load applied to the output shaft exceeds the output torque, then the motor or engine life span decreases due to reverse load application, but increasing the torque capacity increases the device size
Solution Approach 1:
The variable cam mechanism provides automatic feedback-based torque adjustment. As the load on the output shaft increases, the variable cam automatically adjusts the transmission ratio to increase output torque, and vice versa. This eliminates the need for oversized components to handle peak loads, maintaining reliability while keeping the device compact.
Solution Approach 2:
The patent uses a variable transmission ratio mechanism with cam shafts and output links that dynamically adjust the torque output based on load conditions. This dynamic adaptation allows the system to handle varying loads efficiently without requiring excessive torque capacity in all conditions, thus reducing device size while protecting the motor or engine.
3Volume of moving object
If a compact design is implemented, then the device size is reduced, but the ability to automatically adjust torque in response to load changes is compromised
Solution Approach 1:
The patent nests multiple functional components within a compact structure. The cam shafts, output links, and variable cam are arranged in a nested configuration around the central input shaft, with driven gears positioned at different radial levels. This nesting allows complex torque adjustment mechanisms to fit within a small volume, achieving both compactness and adaptability.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement of components, positioning driven gears, cam shafts, and output links in different radial and axial dimensions around the input shaft. This dimensional optimization allows the torque adjustment mechanism to operate effectively within a compact footprint, maintaining adaptability while reducing overall device size.
Data Source
AI summary
The present invention relates to a continuously variable transmission apparatus, which is characterized by comprising: an input shaft transferred with torque inputted from the outside; a plurality of driven gears which are arranged around the circumference of the input shaft as a certain phase difference and transferred with the power from the input shaft; a variable cam of which the turning radius can be varied by an external load; a variable input link which is coupled to and transferred with the torque of the input haft and allows the rotation thereof; a one-way clutch which is transferred undirectionally with the bidirectional torque to be transferred to the driven gears, respectively, and rotates the driven gears in one direction; a plurality of cam shafts which contact the one-way direction clutch internally or externally; and a plurality of output links, each of which one end revolves together with the variable cam around the center of rotation of the variable input link and the other ends of which are coupled to the cam shafts respectively and allow swiveling thereof.