Ventilation Member With Projection Passage For Vehicle Lamp
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Solution Overview
Problem
The existing ventilation members for apparatuses like vehicle lamps and electronic control units face issues with buckling and liquid accumulation due to rib formations and surface tension, which impair ventilation, dust-proofness, water-proofness, and oil-repellency.
Innovation Solution
A ventilation member design featuring a cylindrical shape with an outer projection and an inner projection that form a ventilation passage, preventing the ventilation body from being sandwiched and allowing gas flow while preventing liquid and solid entry, and using a cover member with a press-fitted interference to secure the ventilation passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rib is formed on the cover member to secure the ventilation passage, then the ventilation passage is stabilized, but the ventilation body may buckle due to contact with the rib
Solution Approach 1:
The cover member is divided into a main body and a separate securing portion (rib), while the ventilation body is divided into a filter portion and a supporting portion. The securing portion is positioned to secure the ventilation passage without contacting the ventilation body, thus stabilizing the passage while preventing buckling of the ventilation body.
Solution Approach 2:
The supporting portion of the ventilation body acts as an intermediary element between the ventilation passage and the cover member. It provides support to the ventilation passage while preventing direct contact between the cover member's securing portion and the ventilation body, thereby avoiding buckling.
2Stability of the object's composition
If a rib is located in the vicinity of the ventilation body to secure the ventilation passage, then the ventilation passage is stabilized, but liquid may accumulate on the ventilation body due to surface tension
Solution Approach 1:
The securing function is extracted from the region near the ventilation body and relocated to a separate securing portion on the cover member. This portion secures the ventilation passage by contacting the supporting portion of the ventilation body at a distance, eliminating the rib's proximity to the ventilation body and preventing liquid accumulation through surface tension.
Solution Approach 2:
The securing portion is positioned in a different spatial dimension relative to the ventilation body, contacting it through the supporting portion rather than directly adjacent to it. This dimensional separation prevents liquid from adhering to the ventilation body via surface tension while still providing structural stability.
3Stability of the object's composition
If the ventilation body is securely mounted to prevent movement, then positioning stability is improved, but buckling may occur due to contact pressure
Solution Approach 1:
The ventilation body is designed with a supporting portion that has different structural properties from the main ventilation passage. This supporting portion is locally reinforced to bear the contact pressure from the cover member's securing portion, preventing buckling of the entire ventilation body while maintaining positioning stability.
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 prevents buckling and liquid accumulation on the ventilation body, maintaining the functions of ventilation, dust-proofness, water-proofness, and oil-repellency.
Implementation Method 1
a ventilation body (10) mounted so as to cover one end of the cylindrical member (20) in a centerline direction, the ventilation body (10) preventing a liquid and a solid from entering an inside of the cylindrical member (20) from an outside of the cylindrical member (20), the ventilation body (10) permitting a flow of gas between the inside and the outside
Implementation Method 2
the inner projection portion (32) projecting inward from an inner circumferential surface of the cylindrical portion (31) and contacting the outer projection portion (22) of the cylindrical member (20) so as to form a ventilation passage (R) between the ventilation body (10) and the lid portion (33), the ventilation passage (R) allowing gas to flow therethrough
Data Source
AI summary
A ventilation member includes: a cylindrical holding member including an outer projection portion; a ventilation film mounted to cover one end of the holding member in a centerline direction, the ventilation film preventing a liquid and solid from entering the holding member, the ventilation film permitting a flow of gas between the inside and the outside; and a cover member provided around the holding member, the cover member including a side wall portion, a top portion, and an inner projection portion, the top portion closing one end of the side wall portion in the centerline direction, the inner projection portion projecting inward from an inner circumferential surface of the side wall portion and contacting the outer projection portion of the holding member so as to form a ventilation passage between the ventilation film and the top portion, the ventilation passage allowing gas to flow therethrough.