Common Rail Fuel Piping Integration in Engine Head
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing fuel piping arrangements in common rail type fuel supply systems for heavy vehicles are prone to inaccuracies and differences in branch pipe production, leading to internal tension, leakages, and pipe breakage due to their limited cross-section and configuration, which affects fuel pressure and precision in injection.
Innovation Solution
Eliminating branch pipes and directly connecting the common rail to the injectors, with the common rail positioned inside the engine head cover, reduces pressure drops and enhances fuel introduction by minimizing mechanical stress and pressure oscillations, using a single tubular joint with a seal to ensure a hermetic connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If branch pipes are used to connect injectors with the common rail, then the fuel supply system can be assembled with separate components, but internal tension and leakages occur due to production inaccuracies and limited cross-section
Solution Approach 1:
The common rail is integrated directly into the cylinder head cover, merging previously separate components (common rail, head cover, and branch pipes) into a single unified structure. This eliminates the branch pipes that caused leakage risks while maintaining the fuel supply function, directly resolving the contradiction between ease of manufacture and reliability.
2Stress or pressure
If branch pipes with limited cross-section are used, then high pressure fuel can be supplied, but pressure drops occur during injection events reducing fuel introduction
Solution Approach 1:
By integrating the common rail directly into the cylinder head cover and eliminating branch pipes, the fuel path from the common rail to injectors is significantly shortened. This reduces pressure drops during injection events while maintaining high rail pressure, thereby improving fuel introduction efficiency and resolving the contradiction between pressure maintenance and productivity.
3Device complexity
If branch pipes are used to connect injectors, then the common rail can be disposed outside the head cover, but internal tension and pipe breakage occur due to production differences
Solution Approach 1:
The common rail is merged with the cylinder head cover into a single integrated component, eliminating the need for separate branch pipes that were susceptible to internal tension and breakage. This integration removes the weak points in the system while maintaining the necessary fuel distribution function, resolving the contradiction between device complexity and strength.
4Ease of manufacture
If the common rail is disposed outside the head cover with branch pipes, then assembly is simplified, but leakage risks increase due to multiple connection points
Solution Approach 1:
By integrating the common rail into the cylinder head cover, the multiple connection points between the common rail and head cover (through branch pipes) are reduced to a single integrated structure. This eliminates the numerous potential leakage points while maintaining manufacturing feasibility, directly resolving the contradiction between assembly simplicity and leakage prevention.
Data Source
AI summary
The present invention provides for a fuel piping arrangement in common rail type fuel supply systems, the supply system comprising at least one common rail and at least one respective injector, wherein the common rail is connected with the at least one injector directly, by means of only one joint.