Fuel Piping Connecting Head Reinforcement for High-Pressure Sealing
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Solution Overview
Problem
In fuel piping for direct injection internal combustion engines, excessive tightening torque can deform the connecting head, making it difficult to achieve a predetermined axial force for sealing internal pressure, especially in high-pressure applications.
Innovation Solution
Incorporating an inner pipe within the outer pipe, connected to both end portions of the connecting head in an axial direction, which helps prevent deformation and ensures a consistent axial force for sealing, using methods like crimping or brazing for secure connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tightening torque is increased to improve sealing, then sealing performance is improved, but the connecting head deforms
Solution Approach 1:
The fuel piping is divided into outer pipe and inner pipe segments. The inner pipe is inserted into the connecting head and extends beyond both ends, creating separate functional zones that distribute the mechanical loads and prevent concentrated deformation at the connecting head.
Solution Approach 2:
The fuel piping uses a composite structure with outer pipe and inner pipe made of different materials or configurations. This composite design allows the inner pipe to provide additional structural support to the connecting head while the outer pipe handles the primary fluid transport function.
2Force
If tightening torque is increased to ensure sealing, then sealing force is improved, but the connecting head is crushed
Solution Approach 1:
The inner pipe is pre-installed into the connecting head before the final assembly and tightening process. This preliminary action provides pre-support to the connecting head structure, so when tightening torque is applied, the inner pipe already in place prevents crushing and distributes the compressive forces.
Solution Approach 2:
The inner pipe acts as an intermediary structural element between the connecting head and the external environment. It mediates the mechanical stresses by providing internal support, allowing the connecting head to withstand higher tightening forces without deformation or crushing.
Data Source
AI summary
A fuel piping includes an outer pipe that has a connecting head extending outward in a radial direction in at least one end portion thereof and an inner pipe that is built in a part of the outer pipe and is connected to both end portions of the connecting head in an axial direction.