Motor Vehicle Optical Unit Ventilation Duct Seal Integration
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Solution Overview
Problem
Existing vehicle light unit housings with ventilation channels are complex and cumbersome due to the need for additional components like baffles and protruding roofs to prevent water ingress, which complicates the design and increases size.
Innovation Solution
A ventilation channel is implemented using the seal around the indexing pins of the optical unit housing, with holes in the seal and housing allowing the channel to pass through, eliminating the need for a baffle and reducing complexity by utilizing the seal to create both sealing and ventilation functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a baffle and protruding roof are added to protect the ventilation channel from water, then water protection is improved, but device complexity and size increase
Solution Approach 1:
The seal is merged with the ventilation channel function by integrating an opening directly into the seal structure. This combines the sealing function and ventilation function into a single component, eliminating the need for separate baffles and protruding roofs that were required in prior art designs.
Solution Approach 2:
The seal is designed to perform multiple functions simultaneously: it seals the gap between the housing and vehicle wall, provides structural support, and creates the ventilation channel opening. This multi-functionality reduces the overall number of components needed in the housing assembly.
2Object-affected harmful factors
If a baffle and protruding roof are added to protect the ventilation channel from water, then water protection is improved, but the housing size increases
Solution Approach 1:
By merging the seal and ventilation channel into a single integrated structure, the housing volume is reduced. The seal itself forms the ventilation opening, eliminating the need for additional protective structures like protruding roofs that would increase the housing envelope size.
3Productivity
If an opening is created in the indexing pin to allow ventilation channel passage, then ventilation is improved, but manufacturing complexity increases
Solution Approach 1:
The ventilation channel opening is extracted from the indexing pin and relocated to the seal component. This allows the indexing pin to maintain its simple, solid structure optimized for mechanical function, while the seal incorporates the ventilation opening as a separate feature, simplifying the manufacturing process.
4Reliability
If a large seal is used to seal all openings on the rear face, then sealing performance is improved, but device complexity and cost increase
Solution Approach 1:
Instead of using a large seal that covers the entire rear face, the invention applies sealing locally only at the critical indexing pin location where gaps would otherwise exist. The ventilation opening is strategically positioned within this localized seal area, providing effective sealing where needed without the complexity of a comprehensive seal system.
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 solution simplifies the optical unit housing design, reduces size, and maintains high sealing performance while preventing water ingress and condensation on the outer glass, enhancing the optical unit's reliability and aesthetics.
Implementation Method 1
the pin d indexing is surrounded by a flange arranged so as to crush the seal against the wall of the vehicle against which the optical unit housing is intended to rest
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a housing for an optical unit of a motor vehicle, including a ventilation duct (4), between the inside (7) and outside (8) of the housing, and a seal (2) for sealing a pin (10) for indexing the housing on the vehicle. The ventilation duct (4) passes through an opening (20) that is created inside the seal (2).