Oil Resistant Electronic Device Jacket Design
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Solution Overview
Problem
Existing electronic devices, such as connectors and sensors, face issues with chemical solution penetration through the interface between the cable and jacket, leading to decreased insulation resistance and defective connections, especially in severe environments like industrial factories exposed to machine oils and cleaning fluids.
Innovation Solution
A polybutylene terephthalate resin composition containing a thermoplastic elastomer, with a content of 10 to 40 parts by weight per 100 parts of polybutylene terephthalate resin, is used to cover the cable, ensuring the jacket covers the entire cross-section and outer layer by 2.5 mm or more, enhancing coherence and preventing chemical solution ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polyester resin is used for the electronic device, then chemical resistance is improved, but impact strength deteriorates causing easy breakage
Solution Approach 1:
The invention uses a composite material consisting of polybutylene terephthalate resin mixed with a specific amount of thermoplastic elastomer (10-40 parts by weight per 100 parts of polybutylene terephthalate resin). This composite structure combines the chemical resistance of polyester resin with the flexibility and impact resistance of thermoplastic elastomer, resolving the contradiction between chemical resistance and impact strength.
2Reliability
If the jacket is made to cover the cable interface, then chemical solution penetration is prevented, but manufacturing complexity increases
Solution Approach 1:
The invention merges the jacket and cable into a unified structure where the jacket continuously covers the cable interface and extends onto the connector housing. This integration eliminates gaps at the interface, preventing chemical solution penetration while simplifying the overall structure and manufacturing process compared to separate components.
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(b)
Figure 3(a)~3(b)
AI summary
An oil resistant electronic device is provided for sufficiently preventing a chemical solution from penetrating not only through a surface of a material but also an interface between a cable and a jacket. Moreover, the oil resistant electronic device does not cause defective connection even when the oil resistant electronic device is used for a long time under severe environment such as frequently contacting with a machine oil, etc. The oil resistant electronic device of the present invention includes: a functioning section having a function of the electronic device; a cable via which an electric signal is transmitted to the functioning section; and a jacket which covers the cable. The jacket is made of a polybutylene terephthalate resin composition containing a thermoplastic elastomer by 10 to 40 parts by weight with respect to 100 parts by weight of a polybutylene terephthalate resin, and the jacket covers the cable so as to cover (i) an entire cross section of at least one end of the cable and (ii) an outer layer of the cable by 2.5 mm or more in a lengthwise direction from the at least one end.