Spark Plug Auxiliary Combustion Space Through Hole Geometry
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Solution Overview
Problem
Conventional spark plugs experience excessive pressure loss and heat loss in the auxiliary combustion space, leading to insufficient ignition performance due to inadequate design.
Innovation Solution
A spark plug design featuring a center electrode, insulating member, metal shell, ground electrode, and cap with strategically positioned through holes that define an auxiliary combustion space, where the geometry of the through holes minimizes flame interruption by the ground electrode, reducing heat and pressure loss, and enhancing ignition performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the auxiliary combustion space is designed with conventional through hole positioning, then the structure is simple, but the flame is excessively interrupted by the ground electrode causing high pressure loss and heat loss
Solution Approach 1:
The patent applies local quality by positioning through holes at specific locations on the cap where the flame front naturally directs, rather than uniformly distributing them. The through holes are strategically placed in regions where the flame expands preferentially, allowing selective optimization of flame discharge paths while maintaining simple overall structure.
Solution Approach 2:
The patent employs asymmetry in the through hole positioning by placing holes at specific angular positions relative to the ground electrode rather than in a symmetric pattern. This asymmetric arrangement exploits the asymmetric flame expansion pattern to minimize ground electrode interruption while maintaining structural simplicity.
2Reliability
If the auxiliary combustion space uses simple through hole configuration, then the manufacturing is easy, but the ignition performance is insufficient due to excessive flame interruption
Solution Approach 1:
The patent applies parameter changes by optimizing the angular position and radial location of through holes on the cap. Specific parameters such as the angle relative to the ground electrode and the distance from the center are adjusted to achieve optimal flame discharge while maintaining manufacturability through standard drilling operations.
3Loss of energy
If the flame is discharged through conventional through hole positions, then the structure remains simple, but the heat loss and pressure loss are excessively increased
Solution Approach 1:
The patent positions through holes at specific local regions on the cap where flame discharge is most efficient. Rather than using a uniform or symmetric pattern, the through holes are placed in locations that match the local flame expansion characteristics, minimizing energy loss while keeping the overall cap structure simple.
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
The design improves ignition performance by effectively discharging the flame from the auxiliary combustion space, reducing heat and pressure loss, and ensuring efficient combustion in larger combustion chamber volumes.
Implementation Method 1
Spark generated in a gap between the center electrode and the ground electrode ignites the fuel gas introduced into the auxiliary combustion space
Implementation Method 2
the flame is discharged through the hole of the cap to the outside, that is, to the combustion chamber of the internal combustion engine
Data Source
AI summary
A spark plug includes: a center electrode; an insulating member; a metal shell; a ground electrode; and a cap covers an opening of the metal shell on the front end side to define an auxiliary combustion space in which the gap is disposed, a first angle being formed by a second line and a first tangent line, a second angle being formed by the second line and a second tangent line, the second angle being greater than the first angle, and at least a portion of the opening of the specific through hole on the auxiliary combustion space side being positioned on a range of the second angle.