Spark Plug Through-Hole for Electrode Gap Adjustment
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Solution Overview
Problem
Existing spark plugs face challenges in accessing and adjusting the distance between the center electrode and the ground electrode due to high temperatures and the need for electrical discharge machining, which complicates maintenance and can lead to asymmetric ignition with multiple ground electrodes.
Innovation Solution
The spark gap is made accessible along the longitudinal axis of the spark plug by creating a recess or opening in the wall surrounding the electrodes, allowing for the insertion of a spacer gauge to adjust the electrode distance, with the opening being covered by the combustion chamber housing for minimal weakening of the wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the wall surrounding the electrodes is made thick to protect from high temperatures, then heat protection is improved, but access to the spark gap becomes difficult
Solution Approach 1:
The wall is segmented by creating a through-opening that divides it into sections, allowing access to the spark gap while maintaining the overall structural integrity and heat protection of the thick wall design
Solution Approach 2:
A spacer gauge is introduced as an intermediary tool through the opening to adjust the electrode distance, enabling precise adjustment without requiring direct manual manipulation of the electrodes themselves
2Use of energy by moving object
If the electrodes are brought closer to the insulator body to ensure faster heat flow, then heat dissipation is improved, but access to the electrodes becomes more difficult
Solution Approach 1:
The wall is divided by the through-opening to provide access pathways to the electrodes that are positioned close to the insulator body for optimal heat dissipation
Solution Approach 2:
Access to the electrodes is achieved by creating an opening in the radial direction of the wall, allowing adjustment from the side rather than requiring access from the end face, thus maintaining the parallel arrangement of the spark gap
3Manufacturing precision
If electrical discharge machining is used to adjust electrode distance, then adjustment precision is improved, but device complexity increases
Solution Approach 1:
A spacer gauge serves as a simple mechanical intermediary tool that provides precise adjustment of electrode distance through mechanical means, eliminating the need for complex electrical discharge machining equipment and procedures
Solution Approach 2:
The adjustment mechanism allows the spark plug to be serviced using simple, self-contained tools (spacer gauge and pressing mechanism) that do not require external specialized equipment or complex procedures
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 easier access and adjustment of the spark gap, maintaining efficient ignition while minimizing the need for increased ignition voltage and reducing the risk of asymmetric spark discharge, allowing for seamless integration with prechamber ignition systems without engine conversion.
Implementation Method 1
a wall can be provided that conducts heat well
Implementation Method 2
the increasing distance between the center electrode and the ground electrode due to electrical discharge machining
Data Source
Figure 1a
Figure 1b~1d
Figure 2a
AI summary
The invention relates to a spark plug (1), comprising a center electrode (2) and a ground electrode (4), wherein the center electrode (2) is arranged relative to the ground electrode (4) in such a way that the spark gap (s) extends between the ground electrode (4) and the center electrode (2), wherein the spark gap (s) is surrounded by a wall (16), wherein the wall (16) has a recess (22) or opening (20), which is designed in such a way that a feeler gauge (32) can be inserted between the center electrode (2) and the ground electrode (4).