Fuel Injector Spring Clip Axial Positioning
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Solution Overview
Problem
Existing fuel delivery assemblies for internal combustion engines face challenges in secure and efficient assembly, particularly in maintaining the axial position and hydraulic connection of fuel injectors with fuel rails, which can lead to displacement and inefficiencies in fuel delivery.
Innovation Solution
A fuel delivery assembly that includes a fuel injector and injector cup with a spring clip and clamp mechanism, where the spring clip is hydraulically and mechanically connected to the fuel rail, and the clamp secures the injector in place, preventing axial displacement and ensuring a stable assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional fuel injector assembly without additional securing mechanisms is used, then the device complexity is reduced, but the reliability of maintaining axial position and preventing displacement deteriorates
Solution Approach 1:
The spring clip utilizes a flexible thin-walled structure that can elastically deform during assembly and then maintains constant contact pressure on the fuel injector. This flexible structure provides reliable axial position stabilization through continuous mechanical pressure without requiring complex rigid securing mechanisms, thus resolving the contradiction between reliability and device complexity.
2Reliability
If a secure assembly mechanism with spring clip and clamp is implemented, then the reliability of preventing displacement is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The spring clip is pre-assembled onto the fuel rail before the fuel injector is installed. This preliminary action ensures that the securing mechanism is already in place and properly positioned, allowing the fuel injector to be simply snapped into position without requiring complex alignment or securing operations during the main assembly process, thus improving ease of manufacture while maintaining reliability.
3Manufacturing precision
If a clamp mechanism is added to secure the fuel injector, then the manufacturing precision of axial position is improved, but the device complexity increases
Solution Approach 1:
The spring clip acts as an intermediary element between the fuel rail and the fuel injector, providing a simple yet effective mechanism to maintain precise axial positioning. Instead of directly complicating the fuel injector or fuel rail structures, the spring clip mediates the connection, enabling manufacturing precision through a relatively simple added component that can be easily manufactured and installed.
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 secure, easy-to-assemble fuel delivery assembly that maintains the axial position of the fuel injector, ensuring efficient fuel delivery and reducing the risk of displacement, thereby enhancing the performance and reliability of the internal combustion engine.
Implementation Method 1
the spring clip may have an axially compliant portion bearing against the shoulder of the fuel injector. The axially compliant portion is elastically deformable—and in some embodiments is elastically deformed at least in the assembled state of the fuel delivery assembly—to bias the fuel injector in axial direction from the upper end towards the lower end
Implementation Method 2
The spring clip has a base portion with two radially compliant webs. In particular, the webs are flexible in radial direction so that they are elastically deformable for engaging and disengaging around the circumferential wall of the injector cup
Data Source
AI summary
A fuel delivery assembly for an internal combustion engine, including an injector cup, a fuel injector received therein, and a spring clip is disclosed. The injector cup has a circumferential wall with an external shoulder. The fuel injector has a shoulder which is axially spaced apart from the injector cup. The spring clip has a base portion with two radially compliant webs bearing against the shoulder of the circumferential wall and being in force-fit engagement with the circumferential wall. The spring clip has an axially compliant portion bearing against the shoulder of the fuel injector and being elastically deformable to bias the fuel injector in axial direction from the upper end towards the lower end.