Belt-Drive CVT Tone Wheel Layout for Sensor Flexibility
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Solution Overview
Problem
The existing belt-drive CVT systems have limited layout flexibility due to the fixed installation position of rotation sensors, which restricts the arrangement of detection devices and affects the accuracy and efficiency of rotation speed detection.
Innovation Solution
A belt-drive CVT system with a tone wheel that extends along the moving direction of the movable pulley, featuring detection portions at regular intervals around its circumference, allowing the sensor to be positioned closer to the movable pulley, thereby increasing layout flexibility and detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detection teeth are formed on the stationary pulley, then rotation state detection is enabled, but the installation position of the rotation sensor is limited, reducing layout flexibility
Solution Approach 1:
Instead of forming detection teeth on the stationary pulley as in conventional designs, this invention forms the detection teeth on the tone wheel that rotates with the movable pulley. This inversion allows the sensor to be installed on the stationary pulley side, enabling flexible layout arrangements while maintaining accurate rotation state detection capability
Solution Approach 2:
The tone wheel serves as an intermediary element that carries the detection teeth. By placing the detection features on the rotating tone wheel rather than directly on the stationary pulley, the system enables the sensor to be positioned on the stationary side, thus achieving both detection functionality and layout flexibility
2Measurement precision
If the sensor is positioned closer to the movable pulley, then detection accuracy improves, but installation space requirements increase
Solution Approach 1:
The tone wheel extends in the axial direction (third dimension) rather than only radially. This dimensional extension allows the detection portions to be positioned axially close to the movable pulley while keeping the sensor installation area compact in the radial direction, thus achieving high detection accuracy without significantly increasing overall installation space
Data Source
AI summary
A belt-drive CVT includes a pair of pulleys, each of which has a stationary pulley and a movable pulley that moves toward or away from the stationary pulley in an axial direction of the pulley, a belt that is wound around the pair of pulleys and a rotation state detecting device for detecting rotation of the pulley. The rotation state detecting device has a tone wheel that rotates integrally with the pulley and a sensor that faces the tone wheel. The tone wheel has a cylinder portion that extends along a moving direction of the movable pulley. The cylinder portion is provided with a plurality of detection portions which are arranged at regular intervals in a circumferential direction throughout an entire circumference of the cylinder portion and which extend along the moving direction of the movable pulley.