Toothed CVT Diameter Compensation for Smooth Belt Re-Engagement
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Solution Overview
Problem
Existing CVTs face challenges with smooth tooth re-engagement due to significant Transmission Belt Teeth Compression and stretching, especially under heavy load conditions, leading to misalignment and variation in tension, which affects the transmission efficiency.
Innovation Solution
The CVT employs a Transmission Diameter Compensating Mechanism to increase the diameter of the Driving Cone when torque increases, and a slack-side Tensioning Pulley to maintain constant tension, along with a slack-side Constrainer to manage slack, minimizing angle changes and reducing variations in belt tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the CVT uses a traditional tensioning system without diameter compensation, then the structure is simpler, but the teeth re-engagement becomes rough due to belt compression and stretching under heavy load
Solution Approach 1:
The patent changes the transmission diameter parameter dynamically through the Transmission Diameter Compensating Mechanism. When heavy load causes belt compression and stretching, the mechanism increases the transmission diameter of the driving cone to compensate, maintaining proper tooth alignment and engagement conditions despite the varying belt tension and compression states.
Solution Approach 2:
The Tensioning Pulley acts as an intermediary element between the driving and driven cones. It provides controlled belt tension and slack management, mediating the force transmission while allowing the diameter compensating mechanism to adjust the driving cone's transmission diameter independently, thereby ensuring smooth teeth re-engagement without direct rigid coupling.
2Manufacturing precision
If the Transmission Diameter is kept constant, then the mechanism is simpler, but the teeth misalignment increases under varying torque conditions
Solution Approach 1:
The patent transitions from a static transmission diameter to a dynamic one that automatically adjusts with load conditions. The Transmission Diameter Compensating Mechanism enables the driving cone's transmission diameter to vary dynamically in response to torque changes, belt compression, and stretching, thereby maintaining precise tooth alignment across different operating conditions without requiring complex active control systems.
Solution Approach 2:
The diameter compensating mechanism is designed to self-adjust based on the physical state of the transmission belt and the torque being transmitted. As the belt compresses and stretches under varying loads, the mechanism automatically modifies the transmission diameter to compensate, eliminating the need for external sensors or active control systems to maintain tooth alignment precision.
3Reliability
If the slack side tension varies significantly, then the tensioning pulley design is simpler, but the teeth re-engagement of the driven cone becomes rough
Solution Approach 1:
The Tensioning Pulley serves as an intermediary that decouples the tension variations on the slack side from the driven cone's engagement conditions. By positioning and designing the tensioning pulley to manage belt slack independently, it mediates the tension forces, ensuring that the driven cone experiences consistent engagement conditions despite variations in slack side tension caused by changing transmission ratios and load conditions.
Data Source
AI summary
A toothed CVT using a Cone with One Torque Transmitting Member that is coupled by a Transmission Belt to another Cone with One Torque Transmitting Member for which teeth re-engagement between the Torque Transmitting Members and their Transmission Belt is improved. Said CVT uses a slack-side Tensioning Pulley in order to maintain the tension in the slack-side of the Transmission Belt almost constant so as to ensure smooth re-engagement of the Driven Cone; and a Transmission Diameter Compensating Mechanism, which increases the Transmission Diameter of the Driving Cone when the torque being pulled by the Driving Cone is increased, in order to compensate for an increase in “Transmission Belt Teeth Compression” and an increase in “stretching of the tense-side of the Transmission Belt”, due to an increase in tension in the tense-side of the Transmission Belt when an increased torque is transmitted; to ensure smooth re-engagement of the Driving Cone.