Spark Plug Insulator Front End for Flame Jet Ignition
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Solution Overview
Problem
Existing spark plugs with auxiliary combustion chambers face inefficiencies due to thermal energy absorption by metal components, which hampers flame jet generation and ignitability.
Innovation Solution
A spark plug design featuring a central electrode, ground electrode, and insulator with a cylindrical shape, where the insulator's front end part covers the auxiliary combustion chamber from the outer radial side, reducing thermal energy absorption and enhancing ignitability by preventing flame leakage to metal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal members (plug cover and housing) form the auxiliary combustion chamber, then the structure provides mechanical support and containment, but the metal members absorb thermal energy of the flame, inhibiting flame jet generation
Solution Approach 1:
The patent introduces a heat insulating member as an intermediary substance between the flame and the metal plug cover/housing. This heat insulating member has low thermal conductivity, preventing thermal energy from being absorbed by the metal members while still allowing the auxiliary combustion chamber to be properly contained and supported. The heat insulating member mediates the thermal interaction, solving the contradiction between structural support and thermal energy absorption.
2Reliability
If the auxiliary combustion chamber is formed by metal members, then the chamber structure is strong and durable, but flame leakage to metal components occurs, reducing ignitability
Solution Approach 1:
The heat insulating member serves as a protective intermediary that prevents direct contact between the flame and the metal plug cover/housing. By placing this low thermal conductivity material between the flame and metal surfaces, the patent prevents flame leakage to metal components while maintaining the structural integrity and durability of the auxiliary combustion chamber formed by the metal members.
3Volume of stationary object
If thermal energy is absorbed by metal components, then the structure can contain the combustion, but the flame jet generation is inhibited, reducing ignitability
Solution Approach 1:
The heat insulating member acts as a thermal barrier intermediary that allows the auxiliary combustion chamber to maintain its containment volume while preventing harmful thermal energy absorption by the metal plug cover and housing. This enables the flame to develop properly and generate effective flame jets for igniting the main combustion chamber, thus improving ignitability efficiency without compromising chamber containment.
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
Improves ignitability by suppressing thermal energy absorption and promoting flame generation within the auxiliary combustion chamber, leading to more effective fuel mixture ignition in internal combustion engines.
Implementation Method 1
the insulator front end part covers the auxiliary combustion chamber from an outer radial side of the auxiliary combustion chamber... reducing thermal energy absorption
Data Source
AI summary
In a spark plug for an internal combustion engine, a discharge gap is formed between a central electrode and a ground electrode in an axial direction of the spark plug. An insulator of a cylindrical shape has an axial hole and an insulator front end part. The axial hole is formed in the insulator, into which the central electrode is arranged and supported. The insulator front end part projects further toward a front side of the insulator in the axial direction of the spark plug than a location of an opening part formed at a front end side of the axial hole. The discharge gasp is formed in an auxiliary combustion chamber. The outer peripheral side of the auxiliary combustion chamber is covered with the insulator front end part.