Toroidal CVT Speed Control via Screw Rod and Friction Ball Tilting
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Solution Overview
Problem
Current ball toroidal continuously variable transmissions (CVTs) face challenges in implementing automatic electric speed control, limiting their practical application, especially with the advancement of artificial intelligence requiring sophisticated motor control for optimal output.
Innovation Solution
A speed adjusting mechanism for roller traction toroidal CVT, featuring an input and output disk, a rotation shaft, a screw rod, and friction balls with arc-shaped screw gears, allowing synchronized tilting of friction ball spindles to adjust rotation speeds, enabling precise control through a motor-driven screw rod and angular position sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If ball toroidal CVT is used with simplified structure, then fewer parts and less resistance are achieved, but automatic electric speed control cannot be implemented
Solution Approach 1:
An electric motor is introduced as an intermediary component to drive the friction ball carrier, enabling automatic electric speed control. The motor converts electrical signals to mechanical motion, tilting the friction balls to adjust speed ratios without manual intervention, thus resolving the contradiction between simplified structure and automation capability.
Solution Approach 2:
The manual mechanical adjustment system is replaced with an electric motor-driven system. The motor provides precise electronic control of the friction ball carrier position, substituting complex mechanical linkages with an electromechanical system that achieves automation while maintaining relatively simple structure.
2Device complexity
If friction balls are tilted to change speed ratio, then power transmission is simplified, but precise control capability is insufficient for AI applications
Solution Approach 1:
Speed sensors are integrated to detect the actual rotation speeds of input and output shafts, providing feedback signals to the control system. This closed-loop feedback enables precise control by continuously monitoring and adjusting the friction ball tilt angle based on actual performance, meeting AI application requirements while maintaining simple friction-based power transmission.
Solution Approach 2:
The system transitions from static friction ball positioning to dynamic adjustment capability. The electric motor enables real-time tilting of friction balls during operation, allowing continuous variation of speed ratios with high precision control, thereby enhancing adaptability for AI-driven applications without complicating the fundamental power transmission mechanism.
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 mechanism enables precise and efficient control of rotation speed ratios between input and output shafts, enhancing the CVT's ability to adapt to AI-driven motor control, improving power transmission efficiency and reducing mechanical resistance.
Implementation Method 1
a screw rod, coaxially connected to the rotation shaft so as to be brought to rotate therewith; and a plurality of friction balls, each respectively being enabled to contact with the input disk and output disk... the screw rod is engaged to screw gears for enabling the rotation of the screw rod to bring the screw gears to rotate correspondingly and thus causing the spindles of the plural friction balls to tilt
Implementation Method 2
the rollers are disposed for allowing the same to move along the axis of the near-conical parts, changing angle as needed to maintain contact so as to transfer power from the input disc to the output disc by the friction of the contact
Data Source
AI summary
A speed adjusting mechanism for roller traction toroidal continuously variable transmission is disclosed, which comprises an input disk; an output disk coaxially and symmetrically positioned relative to the input disk; a rotation shaft thought the axis of input disk and output disk; a screw rod coaxially connected to the rotation shaft and being rotated accordingly; and a plurality of friction balls respectively contact with the input disk and output disk and rotate same; each friction ball respectively revolved on its own center axis and each center axis respectively connected to a supporting bracket and each supporting bracket respectively connected to an arc-shaped screw gear; wherein the screw rod is engaged to the screw gears so that they will rotate correspondingly to let each center axis tilt to the same extent so that the input disk and out disk will have different rotation rate.