Reagent Injection Device Valve Housing Assembly
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Solution Overview
Problem
Existing injection devices for internal combustion engines are not conveniently manufactured and are not optimized for administering reagents like urea to reduce exhaust emissions efficiently, as they often require complex assembly and are exposed to high temperatures, leading to potential reagent degradation and uneven spray patterns.
Innovation Solution
A compact injection device design featuring a sub-assembly with a valve housing and bias means, secured within a device housing via interference fits and potentially glue, allowing for easy assembly and adjustment, with insulating features to maintain reagent coolness and ensure uniform spray delivery through a valve mechanism with a stop member for controlled reagent release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex assembly structure is used to secure the valve housing within the device housing, then the reliability of reagent delivery is improved, but the ease of manufacture and assembly deteriorates
Solution Approach 1:
The valve housing is integrated directly with the device housing through an interference fit, eliminating the need for separate mounting brackets, screws, or clips. This merging of components achieves both reliable securing (through the robust interference fit) and ease of manufacture (through reduced part count and simplified assembly steps).
Solution Approach 2:
The interference fit acts as an intermediary mechanism between the valve housing and device housing, providing a secure connection without requiring additional fastening components. The interference fit design allows for reliable reagent delivery while maintaining manufacturing simplicity through a single-step press-fit assembly process.
2Reliability
If additional connection features (screw threads, collets) are added to hold the valve housing securely, then the reliability of the injection device is improved, but the device complexity increases
Solution Approach 1:
The securing function is merged into the basic interference fit between valve housing and device housing, eliminating the need for separate connection features like screw threads or collets. This reduces structural complexity while maintaining reliability through the inherent mechanical interlock of the interference fit design.
Solution Approach 2:
The patent extracts and removes unnecessary connection features (screw threads, collets, and other fastening elements) from the design, retaining only the essential interference fit. This extraction simplifies the overall structure while preserving the reliable securing function needed for injection device operation.
3Manufacturing precision
If the valve means is held securely with multiple connection points, then the spray uniformity is improved, but the ease of assembly deteriorates
Solution Approach 1:
The valve housing and device housing are merged through a single interference fit connection that provides both secure holding and proper alignment. This eliminates the need for multiple connection points while maintaining spray uniformity through the precise geometric relationship established by the interference fit design.
Solution Approach 2:
The interference fit creates an equipotential connection between the valve housing and device housing, ensuring uniform positioning and alignment without requiring multiple adjustment points. This single secure connection maintains spray uniformity while simplifying assembly to a single insertion and press-fit operation.
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 device facilitates efficient, uniform reagent delivery into the exhaust chamber, reducing emissions effectively while being easy to manufacture and assemble, with adjustable opening pressure and spray characteristics to suit varying engine conditions, and minimizing exposure to high temperatures to prevent reagent degradation.
Implementation Method 1
The valve housing is held securely within device housing bore by means of an interference fit
Implementation Method 2
bias means for applying a biasing force to the valve means which serves to urge the valve means against the valve seat
Implementation Method 3
the valve means may include a guide region which forms a clearance fit within the valve housing and serves to guide movement of the valve means
Data Source
AI summary
An injection device for administering a reagent into an exhaust chamber of an internal combustion engine, comprising a device inlet and a device outlet and a sub-assembly held securely within a device housing. The sub-assembly comprises (i) valve housing defining a valve seat, (ii) valve means movable outwardly from the valve housing, away from the valve seat, to permit the reagent to be delivered into the exhaust chamber through the device outlet, whereby a force is applied to the valve means due to reagent delivered to the device inlet which serves to urge the valve means away from the valve seat, and (iii) bias means for applying a biasing force to the valve means which serves to urge the valve means against the valve seat so as to prevent delivery of the reagent through the device outlet into the exhaust chamber. The device housing is a separate part from the valve housing and has a housing bore within which the valve housing is held securely so as to hold the sub-assembly securely within the device housing.