Fuel Injector Assembly Side Entry Installation
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Solution Overview
Problem
Conventional fuel injectors with side entry connections face installation challenges due to minimum bend radius limitations and risk of damaging engine top cover seals during installation, which increases installation complexity and reduces the height reduction benefit.
Innovation Solution
A fuel injector assembly with a backleak chamber and O-ring seal between the injector body's trailing end and cap, allowing for separate installation of the injector body and cap, and an inlet connector that aligns and secures to prevent misalignment and seal damage, while maintaining the height reduction benefits of side entry designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a side entry connection is used to reduce height, then the height of the assembly is reduced, but the engine top cover aperture seal may be damaged during installation
Solution Approach 1:
The fuel injector assembly is divided into separate components: the injector body and the cap with side entry connection. This allows the injector body to be installed first through the engine top cover aperture, followed by attachment of the cap assembly, thereby protecting the aperture seal from damage while maintaining the height reduction benefits of side entry design
Solution Approach 2:
The injector body is installed into the engine cylinder head through the aperture seal before the cap assembly is attached. This preliminary installation sequence ensures the aperture seal is not exposed to potential damage from the side entry connection installation process
2Ease of operation
If the side inlet angle is made steeper to ease engine cover installation, then the ease of operation is improved, but the height reduction benefit is reduced
Solution Approach 1:
By separating the injector body from the cap assembly with side entry, the connection angle can be optimized for compactness without compromising installation ease, as the cap can be attached after the injector body is securely in place
3Device complexity
If a conventional axial threaded connection is used, then the structural simplicity is maintained, but the height of the assembly increases and installation flexibility is limited
Solution Approach 1:
The connection geometry transitions from axial (conventional threaded connection along the injector axis) to lateral (side entry connection perpendicular to the axis). This dimensional change enables compact installation angles and reduced overall height while preserving structural simplicity through straightforward cap attachment
Data Source
AI summary
A fuel injector assembly comprising an injector body having a leading end, a fuel inlet passage, a backleak passage and a trailing end that terminates in an end surface; a cap that fits over the trailing end of the injector body to define therebetween a chamber for receiving fuel from said backleak passage; and a seal for sealing said chamber to prevent the flow of fuel therefrom, wherein said seal is disposed between said end surface of the trailing end and an inlet end of said fuel inlet passage.