Prechamber Element Layout Beyond Assembly Channel Limits
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Solution Overview
Problem
Existing prechamber elements in igniting devices do not ensure sufficient ignition and combustion of fuel-air mixtures due to limited design freedom and positioning of transfer passages, constrained by the minimum cross section of the assembly channel.
Innovation Solution
The prechamber element is designed with outlet openings of transfer passages positioned at least partially outside the minimum cross section of the assembly channel, allowing for greater spacing and arrangement independent of the channel's dimensions, and can be installed from the side of the cylinder head facing the main combustion chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the prechamber element is designed with conventional transfer passage arrangement within the minimum cross section of the assembly channel, then the assembly channel dimensions are respected and the prechamber element can be installed, but the ignition and combustion efficiency are insufficient
Solution Approach 1:
The patent positions outlet openings of transfer passages at least partially outside the three-dimensional body described by the geometric extrusion of the minimum cross section of the assembly channel. This spatial repositioning in a different dimensional arrangement allows the outlet openings to achieve better flame propagation characteristics while still being installable through the constrained assembly channel, effectively resolving the contradiction between combustion efficiency and assembly constraints
Solution Approach 2:
The patent changes the spatial parameters of the outlet openings by positioning them outside the conventional boundaries defined by the assembly channel's minimum cross section extrusion. This parameter change enables improved ignition and combustion efficiency while maintaining compatibility with the assembly channel dimensions through the specific geometric arrangement
2Reliability
If the outlet openings of transfer passages are positioned outside the minimum cross section of the assembly channel, then the ignition and combustion efficiency improve, but the arrangement is constrained by the assembly channel geometry
Solution Approach 1:
By positioning outlet openings outside the extruded minimum cross section body, the patent utilizes spatial arrangement in another dimensional configuration that provides improved combustion efficiency while maintaining adaptability to the assembly channel geometry through careful positioning
3Ease of repair
If the prechamber element is installed from the side of the cylinder head facing away from the main combustion chamber, then the prechamber element can be replaced without disassembling the cylinder head, but the outlet opening arrangement is limited by the assembly channel minimum cross section
Solution Approach 1:
The patent maintains the ease of replacement by installing the prechamber element through the assembly channel from the side facing away from the main combustion chamber, while simultaneously achieving improved ignition and combustion efficiency by positioning outlet openings outside the conventional extruded boundaries, thus resolving the contradiction between maintainability and performance
Data Source
AI summary
A prechamber element for an igniting device has a main body and a prechamber cover. The main body and the prechamber cover form a prechamber. The main body has an opening for receiving a spark plug and has a fastening portion for arrangement in an assembly channel of a cylinder head or a cylinder head sleeve. At least one overflow passage is formed on the main body and/or on the prechamber cover. At least one outlet opening of the at least one overflow passage lies at least partially outside a volume body that is described by a geometric extrusion of a smallest cross section of the assembly channel along a longitudinal axis of the assembly channel. An igniting device has a prechamber element and a cylinder head sleeve and/or a cylinder head.