Angular Spark Plug Gasket Design for Combustion Engine Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional spark plug gaskets suffer from reduced airtightness due to indentation on the rear end surface, leading to gaps between the spark plug and engine, which compromises the sealing effectiveness.
Innovation Solution
An angular gasket design featuring a first section with intermittent concave portions and convex projections, and a second section that is thinner than the thickest part but thicker than the first section, is used to maintain airtightness by minimizing surface unevenness and preventing slipping, with the second section being formed closer to a flat surface to reduce gaps when in contact with the spark plug.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If groove portions are formed intermittently along the circumferential direction of the inner circumferential side of the front end surface, then dislodgment from the male thread portion is prevented, but indentation occurs on the rear end surface causing gaps and reduced airtightness
Solution Approach 1:
The gasket is divided into multiple sections along the radial direction: a first section at the inner circumferential edge with concave portions for anti-dislodgment, and a second section extending radially outward with larger thickness to provide a flat rear end surface for sealing. This segmentation allows each section to fulfill its specific function without compromising the other.
Solution Approach 2:
Different sections of the gasket are given different thicknesses to optimize local functions. The first section has smaller thickness for flexibility and anti-dislodgment, while the second section has larger thickness to maintain flatness and ensure airtightness at the rear end surface contacting the spark plug base surface.
2Ease of manufacture
If the gasket is made thinner to reduce material load, then manufacturing becomes easier, but airtightness cannot be maintained due to increased deformation and gaps
Solution Approach 1:
The gasket employs non-uniform thickness distribution where the second section has larger thickness than the first section. This local quality variation ensures that the sealing-critical rear end surface maintains sufficient thickness to prevent deformation and gaps, while the overall gasket remains relatively thin to reduce material load and ease manufacturing.
Data Source
AI summary
An angular gasket for a spark plug used for mounting a spark plug to a wall of a combustion engine. The gasket provided with a first section with predetermined thickness, having a plurality of concave portions provided as grooves intermittently disposed along a circumferential direction on a first surface being a wall section of the gasket, at an inner circumferential edge thereof. The gasket further provided with convex portions on a section of the inner radial side, with respect to the concave portions projecting toward the inner radial side thereof, at the inner circumferential edge, and a second section being thinner than the a thickest part of the gasket, and greater in thickness than the first section, disposed between the plurality of concave portions of the inner circumferential edge surface.