Fuel Injector Sleeve Thermal Isolation for Diesel Engine
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Solution Overview
Problem
Conventional electronic fuel injection type diesel engines face challenges in performing precise fuel injection control due to overheating of electronic components in the fuel injector main body portion, which is caused by the heat of the cylinder head.
Innovation Solution
The engine design incorporates a sleeve protruding from the insertion hole in the cylinder head, with a pressure receiving surface that allows the fuel injector to be pressed toward the vortex chamber, creating a gap that reduces heat transfer from the cylinder head to the fuel injector, and includes a washer to apply the pressing force, thereby keeping the electronic components cool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the fuel injector main body portion is disposed in the cylinder head, then the structure is compact, but the electronic components are overheated by heat of the cylinder head
Solution Approach 1:
The fuel injector is divided into two separate portions: the nozzle portion (7d) which remains in the cylinder head for compactness, and the main body portion (7c) containing electronic components which is disposed outside the cylinder head using a sleeve (10). This segmentation allows the hot zone (cylinder head) and temperature-sensitive zone (electronic components) to be spatially separated, resolving the contradiction between structural compactness and temperature control.
Solution Approach 2:
A sleeve (10) is introduced as an intermediary component that extends from the cylinder head to hold the main body portion of the fuel injector outside the hot zone. The sleeve acts as a mediator that maintains the functional connection between the injector nozzle in the cylinder head and the electronic components outside, while providing thermal isolation. This allows the electronic components to be cooled by ambient air or cooling systems without compromising the compact integration of the injection system.
2Ease of manufacture
If the fuel injector main body portion is disposed in the cylinder head, then installation is simple, but precise electronic fuel injection control cannot be performed
Solution Approach 1:
By segmenting the fuel injector into nozzle portion (7d) and main body portion (7c), the design maintains simple installation of the nozzle portion in the cylinder head while relocating the electronic components to a cooler environment. This segmentation enables precise electronic control to be achieved without compromising installation simplicity, as the sleeve (10) provides a straightforward mounting solution for the main body portion.
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
This configuration enables precise electronic fuel injection control by maintaining the electronic components at a lower temperature, preventing overheating and ensuring accurate fuel injection.
Implementation Method 1
the main body portion (7c) of the fuel injector (7) is moved away from the cylinder head (1) by the sleeve (10), and the electronic components in the main body portion (7c) of the fuel injector (7) are hardly overheated by the heat of the cylinder head (1)
Data Source
AI summary
Provided is an electronic fuel injection type diesel engine capable of performing precise electronic fuel injection control. A fuel injector includes a main body portion having a large diameter, a nozzle portion having a small diameter, and a pressing surface formed at a step portion between the main body portion and the nozzle portion, in which the nozzle portion of the fuel injector is inserted from an inside of a sleeve into an inside of an insertion hole, the fuel injector is pressed toward a vortex chamber by a pressing force, and the pressing force applied to the fuel injector is received by a pressure receiving surface of the sleeve from the pressing surface of the fuel injector via the washer.