Fuel Vapor Canister Housing for Honeycomb Adsorbent Insertion
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Solution Overview
Problem
Existing canisters that use honeycomb adsorbents for fuel vapor management risk damaging the adsorbent during insertion due to contact with the housing opening, leading to breakage and improper fuel absorption and desorption.
Innovation Solution
A canister design featuring a tubular body with an inclined inner surface that suppresses adsorbent movement and contact with the opening, ensuring proper insertion and preventing breakage, along with a filter and outer shell for enhanced retention and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the adsorbent is inserted into the housing, then the canister can hold the adsorbent, but the adsorbent may come into contact with the opening end and be damaged
Solution Approach 1:
The inclined surface is formed in advance on the inner wall of the housing, creating a protective guide structure before the adsorbent insertion process begins. This preliminary structural preparation ensures that the adsorbent is guided smoothly during insertion without contacting the sharp opening end, thus preventing damage while maintaining ease of installation
Solution Approach 2:
The inclined surface acts as an intermediary element between the housing opening and the adsorbent. Instead of the adsorbent directly contacting the sharp opening end, the inclined surface serves as a transitional guide that gradually directs the adsorbent into the housing, reducing impact and preventing breakage
2Ease of operation
If the opening is made wider to facilitate insertion, then the adsorbent can be inserted easily, but the adsorbent may move excessively and contact the opening end
Solution Approach 1:
The inclined surface is applied locally at specific regions of the housing inner wall where the adsorbent makes contact during insertion. This localized modification provides guidance and protection exactly where needed, while maintaining the overall structural integrity and appropriate dimensions of the housing
Solution Approach 2:
The inclined surface creates an asymmetric geometry on the otherwise symmetric cylindrical housing. This asymmetric feature is strategically positioned to provide directional guidance to the adsorbent during insertion, preventing excessive movement and contact with the opening end while maintaining ease of insertion
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 design effectively prevents adsorbent breakage during insertion, ensures smooth fuel flow, and maintains the adsorbent in place, enhancing the canister's ability to absorb and desorb evaporative fuel efficiently.
Implementation Method 1
The canister adsorbs evaporative fuel to an adsorbent such as activated carbon
Implementation Method 2
desorbs the fuel from the adsorbent by sucked air, performs purging, and supplies the evaporative fuel to the engine
Data Source
AI summary
A canister that adsorbs and desorbs evaporative fuel generated in a fuel tank of a vehicle includes an adsorbent and a tubular body. A contact surface that is at least a partial area of an inner wall surface of the tubular body in a length direction of a central axis is brought into contact with a side surface of the inserted adsorbent to suppress movement of the adsorbent in a direction orthogonal to the central axis. The tubular body has an inclined surface in which the inner wall surface is inclined in a direction approaching the central axis of the tubular body in at least a partial area of an area from a starting point to the contact surface, the starting point being an opening end of an opening into which the adsorbent can be inserted.