Motor Vehicle Lock Membrane for Pressure Compensation
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Solution Overview
Problem
Motor vehicle locks face challenges in protecting electronic components from moisture and temperature fluctuations, which can lead to condensation and malfunction, especially when exposed to varying environmental conditions.
Innovation Solution
Incorporating a membrane in the lock housing or cover that is moisture-impermeable but air-permeable to compensate for pressure differences and prevent condensation, ensuring the printed circuit board and electronic components remain in a dry region, isolated from direct moisture exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lock housing is sealed to protect electronic components from moisture, then moisture protection is improved, but pressure compensation deteriorates
Solution Approach 1:
A membrane is integrated into the housing cover to create a flexible, moisture-impermeable barrier that allows pressure equalization while preventing moisture ingress. The membrane acts as a selective barrier that responds to pressure differences by flexing, enabling air circulation for pressure compensation while maintaining moisture protection in the sealed housing.
Solution Approach 2:
The membrane serves as an intermediary element between the sealed housing interior and the external environment. It mediates the conflicting requirements by allowing pressure equalization (air permeability) while blocking moisture, thus resolving the contradiction between sealing and pressure compensation.
2Reliability
If the housing is completely sealed to protect electronics, then moisture protection is improved, but temperature-induced pressure fluctuations worsen
Solution Approach 1:
The membrane in the housing cover provides a flexible pathway for pressure equalization that responds to temperature-induced pressure changes. As temperature fluctuates, the membrane flexes to allow air flow that equalizes pressure, preventing stress buildup on the sealed housing and protected electronics.
3Stability of the object's composition
If air circulation is allowed for pressure compensation, then pressure stability is improved, but moisture ingress worsens
Solution Approach 1:
The membrane acts as a selective barrier that permits air molecules to pass through for pressure equalization while blocking larger moisture molecules. This enables continuous pressure compensation through air circulation while preventing moisture ingress that would occur with open ventilation.
Solution Approach 2:
The membrane functions as a porous or microporous material with pore sizes that allow gas molecules (air) to pass while blocking liquid water molecules. This selective permeability enables pressure compensation through air flow while preventing moisture ingress into the sealed housing.
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
This design effectively prevents condensation formation and ensures the longevity and functionality of electronic components by allowing pressure compensation and air circulation, while maintaining the lock's mechanical and electrical integrity across extreme temperature ranges.
Implementation Method 1
a membrane is located in the housing so that at least a pressure compensation through the membrane is possible
Implementation Method 2
a membrane is located in the housing so that at least a pressure compensation through the membrane is possible
Implementation Method 3
If, on the other hand, the air and the lock cool down, condensation of the humidity in the interior of the motor vehicle lock can be prevented by pressure compensation
Data Source
AI summary
A lock for a motor vehicle, comprising a locking mechanism with a rotary latch and at least one pawl, a lock housing with at least one housing cover, a printed circuit board located in an interior of the lock housing, and an electronic component located on the printed circuit board. A membrane is located in the housing so that at least a pressure compensation through the membrane is possible.