Multi-rotation Angle Detection Device Orthogonal Gear Axes
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Solution Overview
Problem
Conventional multi-rotation angle detection devices for rotating bodies exceeding 360°, such as steering shafts, face challenges due to their enlarged external dimensions caused by the arrangement of gears in a single plane, which complicates design and increases size.
Innovation Solution
A multi-rotation angle detection device with a rotor having concentrically arranged first and second gears with different teeth, orthogonal driven gears, and magnetic detection elements, where the magnet mount surfaces are aligned in the same plane, allowing for a compact design and reduced plane size through the use of a housing with an L-like configuration, and employing a microprocessor for angle calculation based on signals from GMR sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two gears with different numbers of teeth are arranged in a single plane, then the angle detection function is achieved, but the external dimension of the device is enlarged
Solution Approach 1:
The patent transitions from a single-plane gear arrangement to a multi-dimensional configuration where the first and second gears are positioned at different radial distances from the rotation axis. This spatial redistribution allows the gears to operate in three-dimensional space rather than being constrained to a single plane, thereby reducing the device's external dimensions while maintaining angle detection functionality through the differential gear mechanism.
2Measurement precision
If gears are arranged in a single plane, then the detection function is achieved, but the device complexity increases
Solution Approach 1:
The patent divides the gear system into distinct functional segments: a first gear with a first number of teeth and a second gear with a second number of teeth, positioned at different radial locations. This segmentation allows each gear to independently engage with corresponding driven gears while maintaining a coordinated relationship through the rotation axis, simplifying the overall arrangement compared to a single-plane configuration where all gears would need to be precisely aligned in one plane.
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 effectively reduces the device's plane size, enhances manufacturing efficiency, and provides reliable angle detection with improved reliability and fail-safe properties by orthogonalizing the gear axes and aligning magnet mount surfaces, enabling precise angle calculation and detection across multiple rotations.
Implementation Method 1
a first magnetic detection element disposed at a position opposite the first magnet above the circuit substrate, a second magnetic detection element disposed at a position opposite the second magnet above the circuit substrate
Data Source
AI summary
A rotating axis of a first driven gear provided with a magnet and a rotating axis of a second driven gear provided with a magnet are orthogonalized with respect to a plane which includes a rotating axis of a rotor having a first gear and a second gear each with a different number of teeth concentrically provided for a flanged gear forming section.