Vehicle Housing Closure With Pressure Compensation Venting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle units with electrical components face challenges in maintaining liquid-tight seals due to temperature and pressure fluctuations, leading to potential water and dirt ingress, which complicates assembly and leak testing, and requires complex and costly pressure compensation elements.
Innovation Solution
A vehicle unit design with a housing opening that allows access to the connection area for tools and visual inspection, enabling the assembly of the housing shell structure before the closure body is attached, which includes a gas-permeable pressure compensation element that ensures liquid-tight sealing while allowing pressure equalization, simplifying the assembly and leak testing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure compensation element is attached directly to the housing cover, then pressure equalization is achieved, but the entire housing cover must be rejected as defective in case of incorrect assembly, increasing cost and complexity
Solution Approach 1:
The housing cover is divided into two separate parts: the main housing cover and a separate closure body. The pressure compensation element is attached only to the closure body, not the entire housing cover. This segmentation allows the closure body to be replaced independently if defective, while the main housing cover remains usable, thereby reducing waste and cost.
Solution Approach 2:
The closure body with the pressure compensation element is extracted as a separate, removable component from the housing cover. This allows the pressure compensation function to be isolated in a small, replaceable unit rather than being integrated into the large, complex housing cover structure.
2Reliability
If the pressure compensation element is attached to the housing cover, then pressure equalization is enabled, but leak testing becomes more difficult and test time increases
Solution Approach 1:
By segmenting the housing cover into a main body and a separate closure body with the pressure compensation element, the leak testing process can focus only on the closure body and its sealing interface with the housing opening, rather than testing the entire housing cover assembly. This significantly reduces test time.
Solution Approach 2:
The closure body with the pressure compensation element can be pre-tested for leaks before being attached to the housing cover. This preliminary testing of the smaller component is more efficient than testing the complete assembled housing cover, reducing overall test time.
3Reliability
If the electrical component is connected before assembling the housing cover, then electrical connection is achieved, but accessibility to the connection area is reduced
Solution Approach 1:
The housing cover is segmented into a main housing cover and a separate closure body. The closure body is designed to be removable, providing access to the connection area located within the housing opening. This allows electrical connections to be made or accessed after the main housing cover is assembled, improving accessibility while maintaining connection reliability.
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 facilitates a reliable and efficient electrical connection of components, reduces the complexity and cost of assembly, and shortens the leak testing time by allowing the housing to be partially assembled before closing with the closure body, ensuring a liquid-tight and gas-permeable seal.
Implementation Method 1
a gas-permeable pressure compensation element which, in the assembled state of the closure body, enables pressure equalization with the surroundings of the housing via the housing opening and the closure body
Implementation Method 2
A high level of tightness against liquid ingress is typically achieved by choosing a hydrophobic and/or oleophobic material as the filter or membrane material
Implementation Method 3
A high level of tightness against liquid ingress is typically achieved by choosing a hydrophobic and/or oleophobic material as the filter or membrane material
Data Source
Figure 1~3
Figure 4~6
Figure 7~10
AI summary
Vehicle assembly comprising: - a housing with a housing shell structure (5) having a housing opening (8), - an electrical component (16) housed in the housing (1), - an electrical connector (10) with an outer connector contact for electrical connection to an electrical system of a vehicle and an inner connector contact (14), - a component contact (9) electrically connected to the electrical component (16) and connected to the inner connector contact (14) in a connection area (A), - a closure body (20) for closing the housing opening (8) against liquid ingress, and - a gas-permeable pressure equalization element (15) that is part of the closure body (20) to allow pressure equalization with the environment of the housing via the closure body (20), - wherein the housing opening (8) allows access to the connection area (A) when not closed.