Spark Plug Sealing Ring Geometry for Cylinder Head Gas Leakage
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Solution Overview
Problem
Existing spark plugs struggle to provide an effective seal between the spark plug and the cylinder head, allowing combustion gases to escape through the gap, necessitating additional components like washers that complicate installation.
Innovation Solution
A spark plug design featuring a metal sealing ring with two distinct regions, one perpendicular and one angled relative to the central axis, integrated into a recessed housing, enhancing sealing by increasing the contact surface area and simplifying installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a washer-like sealing ring is used to seal between the spark plug and cylinder head, then sealing is provided, but the installation becomes more complex and the sealing reliability is insufficient due to gas leakage through gaps
Solution Approach 1:
The sealing ring is integrated directly into the spark plug housing structure, merging the sealing function with the housing component. This eliminates the need for separate washer components and simplifies installation while improving sealing reliability through the unified structure that prevents gas leakage paths.
Solution Approach 2:
The sealing ring transitions from a traditional two-dimensional washer shape to a three-dimensional structure with vertical and inclined surfaces. This dimensional change creates multiple sealing contact points with the cylinder head, significantly improving sealing reliability by blocking gas leakage paths from multiple angles.
2Reliability
If a traditional washer sealing ring is used, then the structure is simple, but the sealing surface area is insufficient leading to gas leakage
Solution Approach 1:
The sealing ring incorporates vertical and inclined surfaces that extend in the axial direction, transforming a two-dimensional sealing contact into a three-dimensional sealing zone. This increases the effective sealing surface area significantly, preventing gas leakage that occurs with traditional flat washers.
Solution Approach 2:
Different surfaces of the sealing ring (vertical surface, inclined surface, bottom surface) are designed with specific geometries optimized for different sealing functions. The vertical surface provides primary sealing contact, while the inclined surface creates a secondary sealing zone, and the bottom surface ensures complete sealing, collectively increasing the total sealing surface area and effectiveness.
Data Source
AI summary
A spark plug. The spark plug includes a central electrode and a ground electrode, an insulator, a metal housing, and a metal sealing ring arranged on an outer side of the housing and configured to seal off at a cylinder head. The sealing ring has a first ring region oriented perpendicularly to a central axis of the spark plug and a second ring region oriented at an acute angle to the central axis of the spark plug. The first ring region is parallel to a shoulder on the housing and the second ring region is arranged on the inner circumference of the first ring region.