Pulley Sensor Layout for Axial Detection Without Interference
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Solution Overview
Problem
Existing sensor arrangements in belt continuously variable transmissions face restrictions in placement due to interference with movable pulleys, limiting the degree of freedom in sensor installation.
Innovation Solution
A sensor arrangement structure where the sensor is positioned on a support portion that rotates with the fixed pulley along the axis, and detection target portions are provided on a plunger that can be visually recognized from the axis direction, allowing the sensor to detect rotation speed without interfering with the movable pulley's displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sensor is provided in a direction perpendicular to the rotation axis of the pulley, then the sensor can detect rotation speed, but the sensor placement is restricted due to interference with movable pulley components
Solution Approach 1:
The invention changes the sensor placement from a perpendicular direction to an axial direction (along the rotation axis). The detection target portion is provided on the plunger in a region visible from the axial direction, and the sensor is positioned on the support portion facing this region from the axial direction, thereby resolving the interference issue with movable pulley components.
2Adaptability or versatility
If additional sensing components are added to increase sensor placement flexibility, then the degree of freedom in sensor provision is improved, but production costs increase and tolerance accumulation issues arise
Solution Approach 1:
The support portion that rotatably supports the fixed pulley is given a dual function: it not only supports the fixed pulley but also serves as a mounting location for the sensor. This eliminates the need for separate sensing components and reduces the overall part count, thereby lowering production costs and minimizing tolerance accumulation.
Data Source
AI summary
The sensor arrangement structure includes a pulley that rotates about a rotation axis; and a sensor that detects rotation of the pulley. The pulley includes a fixed pulley, a movable pulley that can be displaced relative to the fixed pulley in a direction of the rotation axis, and a plunger defining an oil chamber on a back of the movable pulley. The plunger is provided with a detection target portion in a region that can be visually recognized from the direction of the rotation axis, and the sensor is provided on a support portion that rotatably supports the fixed pulley in a direction along the rotation axis and faces the region in which the detection target portion is provided.