Rotation Angle Sensor Eliminating Play With Spring Thrust
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Solution Overview
Problem
Conventional rotation angle detectors for steering wheels face challenges in achieving high accuracy due to eccentric rotation of the rotary body caused by gaps between the cylindrical portion and the opening, leading to inaccuracies in detecting the rotation angle.
Innovation Solution
A rotation angle detector design that incorporates a thrusting device with protrusions on the inner wall of the case to ensure the rotary body remains in pressed contact, eliminating play and eccentricity, allowing for precise rotation and accurate angle detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a gap is provided between the cylindrical portion and the opening for easy assembly, then assembly ease is improved, but rotation accuracy deteriorates due to eccentricity and play
Solution Approach 1:
A thrusting device is introduced as an intermediary component between the rotary body and the case. This thrusting device applies constant thrust to press the rotary body against the inner wall of the opening, eliminating play and eccentricity while allowing the gap to remain for easy assembly. The thrusting device mediates between the conflicting requirements of assembly ease and rotation accuracy.
2Ease of manufacture
If the rotary body is loosely fitted in the opening for easy installation, then installation ease is improved, but detection reliability deteriorates due to play and eccentric rotation
Solution Approach 1:
The thrusting device provides dynamic adjustment by applying constant thrust to maintain optimal contact between the rotary body and the opening. This dynamic pressing force ensures that the rotary body rotates without play or eccentricity during operation, while still allowing for easy installation. The system transitions from a static loose fit to a dynamically controlled tight contact during rotation.
3Device complexity
If no thrusting device is used to simplify the structure, then device complexity is reduced, but rotation stability deteriorates due to eccentricity
Solution Approach 1:
The thrusting device is designed to automatically maintain constant contact with the rotary body through its own elastic deformation or mechanical spring action. The device self-regulates the pressing force to eliminate eccentricity and ensure stable rotation without requiring external control mechanisms. The thrusting device serves itself to maintain the optimal contact state.
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
The solution enables the detector to accurately calculate and detect rotation angles with reduced errors, ensuring reliable operation by maintaining the rotary body in a balanced and non-eccentric state during steering shaft rotation.
Implementation Method 1
a thrusting device for providing thrust on one of the rotary body and the detector body in a direction of the other
Implementation Method 2
utilizing a spring or high-friction materials for stable linked motion with the steering shaft
Implementation Method 3
utilizing a spring or high-friction materials for stable linked motion with the steering shaft
Data Source
AI summary
A rotation angle detector is provided with a spring to thrust a rotary body against protrusions formed on an inner wall of an opening via a detector body in a manner to keep the rotary body rotatable without any play in a linked motion with a steering shaft. As a result, the detector can detect rotation angles of the steering shaft with high accuracy.