Spark Plug Movable Separation Wall for Lean Burn Combustion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In lean burn engines, the pre-combustion chamber faces challenges with insufficient inflow of mixture gas and inadequate scavenging of residual gas due to pressure equilibrium between the main combustion chamber and the pre-combustion chamber, leading to incomplete combustion and reduced ignition efficiency.
Innovation Solution
A spark plug design featuring a main body with a center electrode, a moving chamber, a cap portion with a pre-combustion chamber, a ground electrode, communication holes, a separation wall, and an elastic member, allowing the separation wall to move and vary the volume of the pre-combustion chamber, enhancing gas flow and scavenging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pre-combustion chamber is used in a lean burn engine, then combustion efficiency is improved, but the inflow of mixture gas is limited due to pressure equilibrium
Solution Approach 1:
The patent employs a movable separation wall that can dynamically change the volume of the pre-combustion chamber. During the intake stroke, the separation wall moves to increase the pre-combustion chamber volume, creating a pressure difference that facilitates greater mixture gas inflow. This dynamic volume adjustment resolves the contradiction by enabling both efficient combustion and sufficient gas supply.
Solution Approach 2:
The invention changes the volume parameter of the pre-combustion chamber using an elastic member that responds to pressure changes. The elastic member allows the separation wall to move, thereby changing the chamber volume in response to intake stroke conditions, which increases mixture gas inflow while maintaining combustion efficiency.
2Device complexity
If pressure equilibrium is maintained between main combustion chamber and pre-combustion chamber, then structural simplicity is preserved, but residual gas scavenging is insufficient
Solution Approach 1:
The movable separation wall with elastic member creates a dynamic system that responds to pressure changes during the engine cycle. This dynamic mechanism enables effective residual gas scavenging during the intake stroke while maintaining structural simplicity through the use of a single elastic member rather than complex valve mechanisms.
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 increases the inflow of mixture gas into the pre-combustion chamber, minimizes residual gas, and improves ignition force and combustion efficiency by optimizing gas flow and flame propagation, while reducing knocking and advancing ignition timing.
Implementation Method 1
an elastic member providing an elastic force to the separation wall
Implementation Method 2
as the separation wall moves in a vertical direction by the internal pressure of the pre-combustion chamber
Implementation Method 3
the mixture gas is ignited and then flame thereof is spread to the combustion chamber
Data Source
AI summary
A spark plug is disclosed. A spark plug according to an exemplary embodiment of the present disclosure may include a main body including an electrode body formed with a center electrode and a moving chamber formed, wherein the moving chamber formed between the center electrode and the main body, a cap portion fixedly installed in the main body, formed with a pre-combustion chamber fluidly communicated with the moving chamber, formed with a ground electrode that is disposed to be spaced apart from the center electrode by a predetermined distance, and formed with a plurality of communication hole; a separation wall movably provided along the electrode body, and an elastic member providing an elastic force to the separation wall.