Pre-chamber Spark Plug Oriented Opening Orientation
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Solution Overview
Problem
Existing prechamber spark plugs in internal combustion engines have randomly oriented openings, leading to unpredictable ignition torch orientations in the combustion chamber, which affects the efficiency of lean-burn operations and reliable ignition, especially under high exhaust recirculation rates.
Innovation Solution
A prechamber spark plug design with a prechamber-forming cap that has openings oriented at a predefined angle relative to the thread start, ensuring consistent ignition torch directionality and improved gas exchange, achieved through a method of adjusting the thread profile using an optical measuring system to secure the cap in a precise position during production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the prechamber-forming cap is placed with randomly oriented openings, then the manufacturing process is simple, but the ignition torch orientation in the combustion chamber becomes unpredictable
Solution Approach 1:
The patent applies preliminary action by establishing a reference system on the body (external thread with defined center line and thread start) before placing the cap. This reference system is prepared in advance to guide the precise positioning of the cap openings, ensuring they have the required predefined orientation relative to the thread start before the actual assembly occurs.
Solution Approach 2:
The patent uses an intermediary reference system consisting of the external thread, its center line, and thread start as a mediator between the body and the cap. This intermediary structure provides a common reference framework that enables precise alignment and orientation of the cap openings relative to the body, transforming the positioning task into a measurable geometric relationship.
2Productivity
If the opening orientation is randomly distributed, then the production process is faster, but the ignition efficiency in lean-burn operations deteriorates
Solution Approach 1:
The patent applies parameter changes by transforming the orientation parameter of the cap openings from a random distribution to a specifically defined orientation relative to the thread start. This change in the orientation parameter ensures that ignition torches are directed optimally into the combustion chamber, improving ignition reliability and lean-burn operation without fundamentally changing the production process flow.
3Device complexity
If the cap is positioned without a predefined reference system, then the assembly process is simpler, but the orientation of ignition torches relative to the combustion chamber becomes inconsistent
Solution Approach 1:
The patent applies segmentation by dividing the reference system into distinct, manageable components: the external thread structure, the center line definition, the thread start reference point, and the opening orientation requirement. This segmentation allows each element to be independently established and measured, making the overall positioning system less complex and more implementable while ensuring consistent ignition torch orientation.
Data Source
AI summary
A prechamber spark plug for an internal combustion engine with the following features: a body with an external thread at its front end for screwing the spark plug into the engine; the external thread has a center line and begins with a thread start at the front end; the body has a passage in which an insulator is fastened and a center electrode protrudes from the front end of this insulator; at the front end of the body, a prechamber-forming cap is provided, which delimits a prechamber and shields the center electrode from a combustion chamber of the engine after the spark plug has been installed in the engine; the cap has at least one opening, which has a predefined orientation in relation to the thread start and is oriented obliquely to the center line of the external thread so as to permit a gas exchange between the prechamber and the space outside the prechamber.