Diesel Engine Fire Ring Thermal Management
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Solution Overview
Problem
Diesel combustion engines produce high amounts of particulates that lead to solid deposits, requiring frequent maintenance and affecting engine efficiency, which existing fire ring designs partially address but not effectively in terms of thermal management and engine efficiency.
Innovation Solution
The fire ring's outer surface is modified with protruding portions, such as annular ridges and a cutting edge, to reduce thermal exchange with the cylinder liner and cylinder head, while maintaining the inner surface unchanged to ensure effective sealing and reduced dead volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the fire ring has a large contact surface with the cylinder liner, then thermal management is improved, but thermal exchange between the fire ring and cylinder liner increases leading to more particulate deposition
Solution Approach 1:
The fire ring's outer surface is segmented into multiple protruding portions (ridges) that create discrete contact points with the cylinder liner, rather than a continuous contact surface. This segmentation reduces the total contact area while maintaining thermal management functionality through the remaining contact points.
Solution Approach 2:
The fire ring features localized protruding portions at specific locations on its outer surface, creating areas of concentrated contact (ridges) separated by non-contact regions. This local quality modification allows thermal exchange to occur at specific points while minimizing overall thermal exchange and particulate deposition.
2Reliability
If the fire ring protrudes more into the combustion chamber, then sealing efficiency is improved, but dead volume increases reducing engine efficiency
Solution Approach 1:
The fire ring's inner surface features a curved or rounded profile that optimizes the sealing action against the piston crown while minimizing the protrusion depth into the combustion chamber. The curved geometry allows effective sealing through increased contact pressure and area distribution, rather than relying on deep protrusion.
Solution Approach 2:
The invention modifies the geometric parameters of the fire ring, specifically the profile and curvature of the inner sealing surface, to achieve optimal sealing efficiency with minimal protrusion into the combustion chamber, thereby reducing dead volume while maintaining reliability.
3Ease of manufacture
If the fire ring has a standard cylindrical outer surface, then manufacturing is simplified, but thermal exchange with the cylinder liner is excessive
Solution Approach 1:
The outer surface is segmented into protruding portions that can be manufactured using standard machining operations such as knurling, rolling, or CNC machining. While the surface geometry is modified to reduce thermal exchange, the manufacturing process remains relatively simple and can be integrated into existing production workflows.
Solution Approach 2:
The protruding portions can be created through curved surface machining techniques that are well-established in the industry, allowing the complex geometry to be produced with standard equipment while minimizing thermal exchange between the fire ring and cylinder liner.
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 reduces thermal exchange and particulate deposition, enhances the fire ring's sealing efficiency, and improves engine performance by minimizing contact surface area and dead volume, thereby extending engine service life and reducing maintenance.
Implementation Method 1
reduce the thermal exchange between the fire ring and the cylinder liner by reducing the contact surface between the outer face of the fire ring
Data Source
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AI summary
A Diesel combustion engine includes at least one cylinder (C) with a respective piston (P) and a respective fire ring (FR) inserted in a stepped housing (FRH) defined in a cylinder liner (CL) so as to surround a respective combustion chamber (CC); an outer surface (OS) of the fire ring (FR), intended to contact the stepped housing (FRH), is shaped so as to include at least one protruding portion shaped as a tip or a ridge and to reduce a thermal exchange between the fire ring and the cylinder liner; an upper edge of the fire ring consists of a cutting edge, in contact with a cylinder head (H) and defining a sealing effect between the fire ring (FR) and the cylinder head (H).