Fuel Injection Nozzle Holding Device with Spring-Loaded Fixing Bushing
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Solution Overview
Problem
Existing fuel injection systems for internal combustion engines face challenges in securely holding the fuel injection nozzle in position and simplifying its installation, while minimizing the required effort and resources.
Innovation Solution
A fuel injection system that uses a cylindrical shell body inserted into a cylinder head bore, with a holding device featuring a spring system and a U-shaped fixing clip to securely fasten the nozzle, combined with a high-strength bearing bracket for axial and radial fixation, and a sealing mechanism to ensure proper alignment and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional holding device with multiple separate components is used to secure the fuel injection nozzle, then the nozzle is held securely in position, but the installation process becomes complex and time-consuming
Solution Approach 1:
The holding device merges multiple separate components (clamping element, positioning element, and locking mechanism) into a single integrated unit that can be installed as one piece. This integration maintains the secure holding function while significantly simplifying the installation process by eliminating the need to assemble multiple separate components during installation.
Solution Approach 2:
The holding device is designed with functionally segmented components where the clamping element, positioning element, and locking mechanism are integrated but independently functional. This allows the single integrated unit to perform multiple functions (clamping, positioning, and locking) simultaneously, resolving the contradiction between secure holding and simple installation.
2Reliability
If a conventional holding device with multiple separate components is used to secure the fuel injection nozzle, then the nozzle is held securely in position, but the installation time increases
Solution Approach 1:
The holding device is pre-assembled as an integrated unit before installation, with all components (clamping element, positioning element, locking mechanism) already in their correct positions and configurations. This preliminary assembly eliminates the time-consuming step-by-step assembly process during actual installation, while maintaining the secure holding function through the integrated design.
3Ease of operation
If a simple fastening mechanism is used to install the fuel injection nozzle, then installation is simplified, but the secure holding of the nozzle is compromised
Solution Approach 1:
The holding device incorporates a dynamic locking mechanism that transitions from an open state during installation to a locked state during operation. The spring element provides continuous dynamic clamping force, ensuring the nozzle remains securely held while allowing for easy installation when the locking mechanism is in the open state. This dynamic behavior resolves the contradiction between ease of installation and secure holding.
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 solution provides secure and easy installation of the fuel injection nozzle, enhancing the design strength and manufacturing efficiency by forming a prefabricated structural unit that includes the bearing bracket, spring systems, and insert elements, allowing for reliable operation and reduced installation complexity.
Implementation Method 1
A spring system acts between a first radial stop of the fuel injection nozzle and a second radial stop of the fixing bushing as viewed in the axial direction of the shell body of the fuel injection nozzle. The spring system seeks to move the fixing bushing, by way of a third radial stop, against a locking element system of the insert element
Data Source
AI summary
A fuel injection system designed for an internal combustion engine includes at least one fuel injection nozzle which, by way of a cylindrical shell body, is inserted at least in regions into a bore of a cylinder head and which, by way of a nozzle tip, feeds fuel to a combustion chamber between the cylinder head and a reciprocating piston. The fuel injection nozzle is held in position on a housing section of the internal combustion engine with the interposition of a holding device and, for example, a fastening bolt. The holding device braces a first end region of the fuel injection nozzle against a bore stop within the bore in the cylinder head. To optimize this fuel injection system, the holding device has, outside the bore, a fixing bushing to which the shell body is fixed axially and radially by way of a radial insert element. A spring system acts between a first radial stop of the fuel injection nozzle and a second radial stop of the fixing bushing as viewed in the axial direction of the shell body of the fuel injection nozzle. The spring system seeks to move the fixing bushing, by way of a third radial stop, against a locking element system of the insert element, which is supported on a fourth radial stop applied to the shell body.