Torque Detection Device Magnetism Holder Foreign Matter Intrusion
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Solution Overview
Problem
Existing torque detection devices in electric power steering systems are prone to foreign matter intrusion, such as water, which can adhere to the magnetic sensor's integrated circuit, causing abnormalities.
Innovation Solution
A torque detection device design featuring a tubular magnetism collection unit with adjacent first and second magnetism collection holders that have substrate housing portions with concavo-convex shapes on their mating surfaces, forming a path for foreign matter intrusion that makes it difficult for water to enter the magnetism collection holder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the magnetism collection holder is assembled from separated holders, then the magnetic sensor can be disposed between them for torque detection, but the mating surface between holders allows foreign matter such as water to intrude and adhere to the IC of the magnetic sensor
Solution Approach 1:
The invention introduces a protrusion on one holder and a corresponding recess on the other holder at the mating surface. This adds a dimensional feature (protrusion-recess interface) to the otherwise flat mating surface, creating a physical barrier that prevents foreign matter from reaching the magnetic sensor IC while maintaining the assembled structure.
2Measurement precision
If the magnetic sensor is disposed between separated magnetism collection holders, then torque can be detected through magnetic flux, but the IC of the magnetic sensor is exposed to foreign matter intrusion through the mating surface
Solution Approach 1:
The protrusion and recess structures act as intermediary protective features between the external environment and the magnetic sensor IC. These features create a physical barrier that mediates the interaction between foreign matter and the sensitive IC, preventing direct contact while allowing the magnetic detection function to operate.
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 configuration effectively suppresses the intrusion of foreign matter like water into the magnetism collection holder, preventing it from reaching the magnetic sensor and causing abnormalities.
Implementation Method 1
a permanent magnet; a magnetic yoke which is disposed in a magnetic field formed by the permanent magnet
Implementation Method 2
a magnetism collection ring being attached to an inner peripheral surface of the magnetism collection holder to collect magnetic flux of the magnetic yoke
Data Source
AI summary
A torque detection device that further suppresses intrusion of foreign matter into a magnetism collection holder. A first magnetism collection holder has a first ring portion and a substrate housing portion. A second magnetism collection holder has a second ring portion and a substrate housing portion. A pair of flanges are provided on both side surfaces of the substrate housing portion. The substrate housing portion is provided with a partition wall to be fitted between the flanges. A substrate arrangement portion is provided with a partitioning portion and an extended portion. When the substrate housing portion and the substrate housing portion are stacked on each other, the extended portion is fitted with a recessed portion. The substrate arrangement portion is also provided with a partitioning portion. An extended portion to be fitted with the recessed portion is provided at the distal end of the partitioning portion.