Hook-Like Fuel Rail Protection Device for Engine Impact
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Solution Overview
Problem
Existing fuel rail protection devices for internal combustion engines are bulky and ineffective in maintaining the fuel rail's position relative to the engine during impacts, particularly in engines with limited space, leading to potential detachment and high-pressure fuel leaks.
Innovation Solution
A shock protection device with a hook-like element that integrates with the fuel injection rail, ensuring permanent contact and preventing movement relative to the injectors, using a body mounted to the engine cylinder head with mounting tabs and a hook-like element that extends into the injection rail to maintain position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sheet metal or housing guards are mounted on the engine to protect the fuel rail, then the fuel rail is protected from impact, but the protection device becomes bulky and unsuitable for engines with limited space
Solution Approach 1:
The protection device is divided into separate functional elements: a body mounted to the engine and a hook-like element that engages with the fuel rail. This segmentation allows each component to be optimized independently, resulting in a compact overall structure that provides effective protection without occupying excessive space.
Solution Approach 2:
The hook-like element extends into the engagement space of the fuel rail in a direction orthogonal to the main body, utilizing three-dimensional space efficiently. This dimensional arrangement allows the protection device to be compact while maintaining effective engagement with the fuel rail.
2Reliability
If sheet metal or housing guards are mounted on the engine to protect the fuel rail, then the fuel rail is protected from impact, but the guards do not maintain the fuel rail's position relative to the engine in the event of a significant impact
Solution Approach 1:
The hook-like element is pre-configured to engage with the fuel rail in a manner that actively prevents displacement during impact. The complementary profile of the hook and fuel rail creates a mechanical interlock that counteracts impact forces and maintains position stability.
Solution Approach 2:
The hook-like element serves as an intermediary component between the protection device body and the fuel rail. It transfers and distributes impact forces while maintaining the fuel rail's position relative to the engine, effectively mediating between protective function and position stability.
3Volume of moving object
If a compact protection device is designed for engines with limited space, then the device size is reduced, but the effectiveness of impact protection is compromised
Solution Approach 1:
By segmenting the protection device into a body and a hook-like element, the design achieves compactness in the body while maintaining the effectiveness of the hook element in engaging with the fuel rail. This segmentation allows optimized space utilization without compromising protection effectiveness.
Solution Approach 2:
The body of the protection device can be constructed as a thin-walled structure that provides sufficient protective function while minimizing volume. The hook-like element compensates for the reduced bulk of the body, maintaining overall protection effectiveness in a compact configuration.
Data Source
Figure 1~2
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Figure 5~6
AI summary
The invention relates to an impact protection device (3) for an injection system (4) of an internal combustion engine (2), the protection device (3) having a body (5) and a coupling member (6), connected to the body (5), configured to extend in engagement with the injection rail (41) so as to ensure permanent contact with at least one flat surface of the injection rail (41) and to prevent the movement thereof relative to at least one injector of an engine (2).