Fuel Injection Nozzle Soft Contact Part Misalignment
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Solution Overview
Problem
The existing methods for connecting a fuel injection nozzle to a fuel rail in internal combustion engines face challenges such as noise propagation due to similar moduli of elasticity between metal components, misalignment-induced deformation, and the difficulty of manufacturing an accurately aligned fuel rail, which affects the nozzle's performance and structural integrity under high fuel pressure.
Innovation Solution
A fuel injection nozzle design featuring a soft contact part that undergoes plastic deformation when a bending moment is applied, allowing for rigid fastening to a fuel rail without compromising the nozzle's injection characteristics, using a fastening member with higher strength and a sealing part to prevent fuel leakage, and incorporating a protrusion or U-shaped deformable member to absorb misalignment-induced forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuel injection nozzle is rigidly fastened to the fuel rail using high-strength fastening members, then the structural integrity and sealing performance are improved, but misalignment-induced bending moments cause deformation of the nozzle and affect injection characteristics
Solution Approach 1:
The contact part's material hardness is reduced so that it is softer than the fastening member, allowing it to undergo plastic deformation under bending moments caused by misalignment, thereby protecting the nozzle body from deformation while maintaining reliable fastening
Solution Approach 2:
The contact part is separated from the main nozzle body as a distinct component with different material properties, enabling it to absorb misalignment stresses independently without affecting the injection characteristics of the nozzle
2Strength
If the fuel injection nozzle is made of metal with similar modulus of elasticity to the cylinder head, then the structural strength is improved, but noise generated by the nozzle propagates easily to the cylinder head
Solution Approach 1:
The contact part acts as an intermediary between the fastening member and the nozzle body, providing both mechanical support and acoustic isolation through its softer material that dampens vibration and noise transmission
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 design effectively reduces noise propagation and maintains the nozzle's performance by allowing plastic deformation of the contact part, absorbing misalignment-induced bending moments, and ensuring structural integrity under high fuel pressure without requiring a highly accurate fuel rail, thus reducing manufacturing costs.
Implementation Method 1
the contact part is softer than the fastening member, and the contact part undergoes plastic deformation when a bending moment that bends the axis of the fuel injection nozzle acts on the fuel injection nozzle
Data Source
AI summary
A fuel injection nozzle for directly injecting fuel into a cylinder of an internal combustion engine is inserted in a connecting pipe extending from a fuel rail and is fixed to the connecting pipe by fastening member. The fuel injection nozzle has a sealing part for sealing a fuel passage to prevent fuel leakage, and a contact part in contact with the fastening member. The contact part is softer than the fastening member, and the contact part undergoes plastic deformation when a bending moment that bends the axis of the fuel injection nozzle acts on the fuel injection nozzle.