Electronic Control Housing Sealing for Salt Damage Resistance
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Solution Overview
Problem
Existing electronic control devices in vehicles face challenges in maintaining an airtight structure under stricter salt damage requirements, as conventional sealants relying on hydrogen bonds with metal surfaces are unstable, leading to potential leakage defects.
Innovation Solution
Incorporating a sealant with OH and CH3 groups, and a surface treatment film with OH and CH3 groups on the chassis surfaces, enhancing adhesion through hydrogen, covalent, and intermolecular forces to maintain an airtight structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sealant relying on hydrogen bonds with metal surfaces is used, then the sealing structure is simple, but the adhesion is unstable under salt damage conditions leading to leakage defects
Solution Approach 1:
The patent applies composite materials by combining organic sealant with an inorganic surface treatment film containing silane groups on the metal chassis surface. This composite structure provides both the simplicity of conventional sealants and enhanced adhesion stability through multiple bonding mechanisms (hydrogen bonds, covalent bonds, and intermolecular forces), resolving the contradiction between simplicity and reliability under salt damage conditions.
Solution Approach 2:
The patent changes the chemical parameters of the sealing interface by introducing a surface treatment film with specific functional groups (silane groups). This parameter change transforms the bonding mechanism from simple hydrogen bonding to a combination of hydrogen bonding, covalent bonding, and intermolecular forces, thereby improving adhesion stability without significantly complicating the overall sealing structure.
2Weight of stationary object
If the chassis is made thinner and lighter to improve fuel efficiency, then weight and height are reduced, but heat dissipation properties deteriorate
Solution Approach 1:
The patent applies local quality by providing heat dissipation fins or protrusions at specific locations on the chassis where heat generation occurs. This allows the chassis to remain thin and lightweight overall while having localized heat dissipation structures that improve thermal management without adding significant weight or height.
3Weight of stationary object
If aluminum die-casting is used for the chassis to reduce weight, then weight is reduced, but corrosion resistance deteriorates compared to hot-dip galvanized steel
Solution Approach 1:
The patent applies composite materials by combining aluminum die-cast chassis with a surface treatment film containing silane groups. This composite structure provides both the weight reduction benefits of aluminum and improved corrosion resistance through the protective surface film, resolving the contradiction between weight reduction and corrosion resistance.
Solution Approach 2:
The surface treatment film acts as an intermediary layer between the aluminum chassis and the environment. This intermediary provides corrosion protection to the aluminum chassis, allowing the lightweight aluminum material to be used without sacrificing corrosion resistance.
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 enhanced adhesion maintains an airtight structure even under stringent salt damage conditions, providing high reliability and robustness against corrosion.
Implementation Method 1
an airtight structure depending only on a sealant applied to a metal surface as in PTL 1 relies only on adhesion established by a hydrogen bond or a covalent bond between an OH group on the metal surface and an OH group of the sealant
Implementation Method 2
an airtight structure depending only on a sealant applied to a metal surface as in PTL 1 relies only on adhesion established by a hydrogen bond or a covalent bond between an OH group on the metal surface and an OH group of the sealant
Implementation Method 3
the sealant includes an OH group and a CH3 group, and a surface treatment film including the OH group and the CH3 group is formed on at least a part of a surface region
Data Source
AI summary
An electronic control device includes a first chassis 20, a second chassis 30 fixed to face the first chassis 20, and a sealant 40 that seals an internal space formed by the first chassis 20 and the second chassis 30, in which the sealant 40 includes an OH group and a CH3 group, and a surface treatment film 31a including the OH group and the CH3 group is formed on at least a part of a surface region of at least one of the first chassis 20 and the second chassis 30, the surface region coming into contact with the sealant. This provides an electronic control device that can maintain an airtight structure without largely changing a structure of a sealant filled in a gap between a case and a cover even under a requirement against salt damage that is becoming stricter.