Segmented Valve Connection for Common Rail Pressure Control
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Solution Overview
Problem
Existing apparatuses for pressure control in fuel feed systems of internal combustion engines with common rail injection face challenges in withstanding high pressures and require complex manufacturing processes, as well as being incompatible with synthetic fuels due to material reactions.
Innovation Solution
A high-pressure-resistant connection is achieved by subdividing the connection between the common rail housing and the electromagnetic high pressure valve into differently configured portions with varying mechanical and geometric properties, utilizing an interference fit and elastic deformation to ensure a reliable and pressure-tight seal, eliminating the need for conventional sealing rings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a press-fit connection is used to join the electromagnetic high pressure valve to the common rail housing, then the connection can be simple in structure, but shavings build up during assembly making the connection permeable to pressure and requiring additional sealing measures
Solution Approach 1:
The connection is divided into two distinct portions: a first portion with a press-fit connection for structural support, and a second portion with an interference fit for pressure-tight sealing. This segmentation allows each portion to optimize its function without compromising the other.
Solution Approach 2:
Different mechanical and geometric properties are applied to different portions of the connection. The first portion has properties optimized for mechanical strength and assembly, while the second portion has properties optimized for pressure sealing, eliminating the need for additional sealing measures.
2Device complexity
If a press-fit connection is used to join the electromagnetic high pressure valve to the common rail housing, then the connection structure can be simple, but the force required to join the two components is very high making manufacturing complex
Solution Approach 1:
The connection force requirement is segmented across two portions: the press-fit connection handles structural alignment, while the interference fit in the second portion completes the joining with reduced force requirements, making manufacturing more feasible.
Solution Approach 2:
The geometric parameters of the connection portions are optimized differently: the first portion has parameters for mechanical engagement, while the second portion has parameters optimized for interference fit with controlled expansion, reducing the overall assembly force required.
3Reliability
If conventional sealing rings are used in the connection, then pressure sealing can be achieved, but the materials react with synthetic fuels making them incompatible
Solution Approach 1:
The conventional sealing rings are completely removed from the connection design. Instead, the pressure-tight seal is achieved through the interference fit in the second portion, where the housing material itself provides the sealing function without requiring separate sealing components that would react with synthetic fuels.
Solution Approach 2:
The housing and valve body materials themselves provide the sealing function through their elastic deformation in the interference fit region, eliminating the need for separate sealing components and making the system compatible with synthetic fuels.
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 solution provides a reliable high-pressure-resistant connection that simplifies manufacturing, reduces the risk of shavings, and is compatible with synthetic fuels, ensuring efficient fuel pressure control across a wide pressure range.
Implementation Method 1
the first portion and the at least one second portion have different mechanical and/or geometric properties
Data Source
AI summary
The present invention relates to an apparatus (1) for pressure control in a fuel feed of an internal combustion engine with a common rail injection, comprising a housing (10) with an opening (15), and an electromagnetic high pressure valve (30), wherein the electromagnetic high pressure valve (30) is at least partially inserted into the opening (15) of the housing (10) at the end, wherein the electromagnetic high pressure valve (30) is connected in a pressure-tight manner in the opening (15) to the housing (10) by a connection (20) and the connection (20) has a first portion (21) and at least one second portion (22), and wherein the first portion (21) and the at least one second portion (22) have different mechanical and/or geometric properties.