Exhaust System Fuel Injector Mounting Thermal Insulation
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Solution Overview
Problem
Exhaust system fuel injectors face overheating issues due to high temperatures in the exhaust line, which existing technologies fail to adequately address, risking damage and inefficiency.
Innovation Solution
The solution involves a flange mounted on the exhaust line via a thermal insulator and a constriction in cross section, combined with a ring-shaped cooling channel in the receiving body to reduce heat transfer to the fuel injector, and a tension sleeve for secure fixation and enhanced cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the fuel injector is mounted directly on the exhaust line, then the installation is simple and compact, but the fuel injector overheats due to high temperatures in the exhaust line
Solution Approach 1:
A receiving body is introduced as an intermediary component between the exhaust line and the fuel injector. This receiving body serves as a thermal barrier that isolates the fuel injector from the high-temperature exhaust line, allowing simple mounting while preventing direct thermal contact that would cause overheating.
2Temperature
If a thermal insulator is added between the exhaust line and flange, then heat transfer to the fuel injector is reduced, but the device complexity increases
Solution Approach 1:
A thermal insulator is introduced as an intermediary element between the exhaust line and the flange. This insulator specifically targets and reduces thermal transfer pathways, blocking heat from reaching the fuel injector mounting area while maintaining the structural integrity of the assembly.
Solution Approach 2:
The thermal insulator is strategically positioned at specific locations where heat transfer to the fuel injector would be most harmful. By applying insulation locally at critical thermal pathways rather than uniformly throughout the entire exhaust system, the solution effectively reduces heat transfer while minimizing added complexity.
3Temperature
If the flange is mounted on the exhaust line via a constriction in cross section, then heat transfer from the flange to the receiving body is inhibited, but the structural strength may be reduced
Solution Approach 1:
The flange mounting structure is segmented into distinct functional zones: a constriction region that inhibits heat transfer, and reinforced mounting regions that provide structural strength. This segmentation allows different parts of the flange to perform different functions - the constriction blocks thermal pathways while the reinforced areas maintain mechanical integrity for secure attachment.
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 design effectively reduces heat flow to the fuel injector, preventing overheating and ensuring efficient operation by combining thermal insulation, cross-sectional constriction, and active cooling, thereby enhancing the fuel injector's durability and performance.
Implementation Method 1
The thermal insulator prevents heat transfer from the hot exhaust line to the flange
Implementation Method 2
the constriction in cross section inhibits the transfer of heat from the flange to the receiving body
Implementation Method 3
a cooling channel that extends coaxially with a longitudinal axis of the fuel injector in a ring shape may be integrated into the receiving body
Data Source
AI summary
The present invention relates to an exhaust system for an internal combustion engine, in particular in a motor vehicle, having an exhaust line carrying exhaust gas away from the internal combustion engine and having a fuel injector for injecting fuel into the exhaust line. The fuel injector is mounted on the exhaust line via a mounting device. This mounting device has a receiving body into which the fuel injector is inserted and which is mounted on the exhaust line via a disk-shaped flange. To reduce the risk of overheating of the fuel injector, the flange is mounted on the receiving body via a constriction in cross section and/or on the exhaust line via a thermal insulator.