Rotation Detecting Unit Thermosetting Resin Integration
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Solution Overview
Problem
Conventional rotation detecting units face challenges in reducing size due to lack of adhesive strength between thermoplastic resin and core wires, and the inclusion of holders in magnetism quantity variation sensors limits the overall size of these units.
Innovation Solution
A rotation detecting unit is designed with a main body part integrally formed from thermosetting resin, including a joined part of the rotation detecting part and signal transmission member, which allows for adhesive joining and sealing without a holder, using recesses to secure the rotation detecting part and reduce the overall size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thermoplastic resin is used for the main body, then molding is easier and cost is reduced, but adhesive strength with respect to core wire is lost requiring additional wire forming
Solution Approach 1:
The patent changes the material parameter from thermoplastic resin to thermosetting resin. This parameter change provides both adhesive strength to core wires and electrical insulation properties, eliminating the need for additional wire forming while maintaining molding feasibility
Solution Approach 2:
The main body is formed as a composite structure integrating thermosetting resin with core wires and IC through molding. This composite approach achieves both adhesive bonding and electrical insulation within a single molded component
2Manufacturing precision
If a holder is included for IC positioning and sealing, then positioning accuracy is improved, but the overall size of the rotation detecting unit increases
Solution Approach 1:
The patent merges the holder function with the main body structure. The main body itself provides IC positioning through molded features and sealing, eliminating the need for a separate holder component and reducing overall unit size
Solution Approach 2:
The main body is designed to perform multiple functions simultaneously: structural support, IC positioning, electrical insulation, and sealing. This multi-functionality eliminates the need for separate specialized components
3Strength
If wire forming is added to secure wire fixing force and absorb displacement, then wire fixing strength is improved, but the size of the rotation detecting unit cannot be reduced
Solution Approach 1:
Changing from thermoplastic to thermosetting resin provides inherent adhesive strength that eliminates the need for wire forming. The material parameter change directly addresses wire fixing requirements without additional structural additions
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 a smaller size for the rotation detecting unit with improved sealing and fixing force, ensuring accurate positioning and physical rigidity, while allowing for easy attachment to an external device.
Implementation Method 1
The main body part is integrally molded from thermosetting resin including a joined part obtained as a result of joining together a terminal of the rotation detecting part and the signal transmission member
Data Source
AI summary
A rotation detecting unit is adapted for a rotatable body. The rotation detecting unit includes a rotation detecting part, a signal transmission member, and a main body part. The rotation detecting part detects a rotational state of the rotatable body and outputs a rotation detection signal. The signal transmission member is electrically connected to the rotation detecting part to transmit the rotation detection signal to an external device. The main body part holds at least a part of the signal transmission member and the rotation detecting part. The main body part is integrally molded from thermosetting resin including a joined part obtained as a result of joining together a terminal of the rotation detecting part and the signal transmission member, the part of the signal transmission member, and the rotation detecting part. The main body part includes a recess at a region corresponding to the rotation detecting part.