Torque Sensor Resin Housing Integration for Waterproofing
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Solution Overview
Problem
Conventional torque detecting devices require seal members and multiple fixing screws to ensure waterproof performance, leading to increased weight and cost due to the number of components.
Innovation Solution
A torque detecting device with a multi-polar permanent magnet and a magnetic yoke that rotates within a magnetic field, integrated with a case and external housing formed from resin material, eliminating the need for seal members and fixing screws by ensuring waterproof performance through close contact and reduced component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If seal members and fixing screws are used to ensure waterproof performance, then waterproof performance is improved, but weight and cost increase
Solution Approach 1:
The case and external housing are merged into a single integrated component formed by resin molding. This integration eliminates the need for separate seal members and fixing screws, achieving waterproof performance while reducing the number of parts, weight, and assembly complexity.
2Reliability
If seal members and fixing screws are used to ensure waterproof performance, then waterproof performance is improved, but cost increases
Solution Approach 1:
The case and external housing are merged into a single integrated component formed by resin molding. This integration eliminates the need for separate seal members and fixing screws, achieving waterproof performance while reducing the number of parts, weight, and assembly complexity.
3Device complexity
If the case and external housing are formed integrally, then the number of components is reduced, but water may intrude into the case
Solution Approach 1:
The external housing is formed as a resin shell that covers the outer side surface of the case. This resin shell structure provides waterproof protection while maintaining an integrated design, preventing water intrusion without requiring additional seal members.
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 ensures waterproof performance for the magnetic element while reducing weight and cost by eliminating the need for seal members and fixing screws, and prevents deformation during the molding process, maintaining the magnetic flux detection function.
Implementation Method 1
a permanent magnet that is a multi-polar magnet with a cylindrical shape in which magnetic poles are disposed in a circumferential direction; a magnetic yoke that is formed of a magnetic material and is disposed around the permanent magnet at a position in a magnetic field formed by the permanent magnet
Implementation Method 2
a magnetic element that is disposed around the magnetic yoke, and outputs a signal according to the magnetic field formed by the permanent magnet and magnetic flux of a magnetic circuit including the magnetic yoke
Data Source
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AI summary
A torque detecting device (40) includes a permanent magnet (51); a first magnetic yoke (61); a second magnetic yoke (62); two magnetic elements (73); a terminal (74); a case (102); and an external housing (110). The two magnetic elements (73) are electrically connected to the terminal (74). The case (102) accommodates the two magnetic elements (73) and the terminal (74). The external housing (110) accommodates the permanent magnet (51), the first magnetic yoke (61), and the second magnetic yoke (62), covers an outer side surface of the case (102), and is formed integrally with the case (102).