Motor Vehicle Lock Dry Chamber Sealing
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Solution Overview
Problem
Motor vehicle locks face challenges in protecting electronic and electrical components, particularly printed circuit boards, from penetrating moisture due to exposure to environmental influences like dust, moisture, and extreme temperature fluctuations.
Innovation Solution
The solution involves arranging the printed circuit board in a dry chamber separated from the locking mechanism and sealing this chamber with a flexible plastic film. This plastic film equalizes pressure differences caused by temperature fluctuations, preventing moisture from entering the dry chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the printed circuit board is arranged in a dry chamber separated from the locking mechanism, then protection from moisture is improved, but device complexity increases
Solution Approach 1:
The lock is divided into a wet area containing the locking mechanism and a dry chamber containing the printed circuit board. This segmentation physically separates moisture-prone components from electronics, protecting the PCB from moisture while maintaining functional integration through controlled access points.
Solution Approach 2:
A flexible membrane seals the dry chamber, providing moisture protection while accommodating thermal expansion and contraction. The membrane allows pressure equalization between the dry chamber and external environment, preventing moisture ingress through pressure differentials caused by temperature fluctuations.
2Reliability
If the dry chamber is completely sealed, then moisture protection is improved, but pressure equalization is worsened
Solution Approach 1:
The flexible membrane serves as a selective barrier that blocks moisture while permitting pressure equalization. It allows the dry chamber to maintain positive pressure relative to the external environment, preventing moisture ingress through pressure differentials caused by temperature fluctuations.
Solution Approach 2:
The membrane acts as an intermediary element between the dry chamber and external environment. It mediates the conflict between sealing requirements and pressure equalization needs, allowing pressure exchange while blocking moisture transfer.
3Reliability
If adhesive film is used to seal the lock, then moisture protection is improved, but adaptability to temperature fluctuations is worsened
Solution Approach 1:
The flexible membrane provides both moisture protection and thermal adaptability. Its flexibility allows it to expand and contract with temperature changes, preventing stress concentration and sealing degradation while maintaining moisture barrier integrity across the operating temperature range of -40°C to +80°C.
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 use of a flexible plastic film to seal the dry chamber effectively protects electronic components from moisture and ensures consistent functionality across extreme temperature ranges, maintaining the integrity of the motor vehicle lock's electrical system.
Implementation Method 1
This plastic film equalizes pressure differences caused by temperature fluctuations, preventing moisture from entering the dry chamber
Data Source
AI summary
A lock for a motor vehicle, comprising a locking mechanism with a rotary catch and at least one locking pawl, wherein the rotary catch can be latched by means of the locking pawl in at least one latching position, a lock housing with at least one housing cover, a printed circuit board which is arranged in the interior of the lock housing, wherein the printed circuit board is arranged in a dry chamber which is separated at least from the locking mechanism, and wherein the dry chamber can be sealed by way of a plastics film.