Spark Plug Injection Hole Orientation Control
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Solution Overview
Problem
Existing spark plugs for internal combustion engines do not consider the orientation of the injection hole in the plug circumferential direction, leading to heat loss and suboptimal combustion efficiency.
Innovation Solution
A spark plug design that includes a positioning portion in the housing and plug cover to determine the orientation of the injection hole relative to the main combustion chamber, allowing for controlled flame injection and improved fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the injection hole orientation is not controlled in the plug circumferential direction, then the device structure is simpler, but heat loss increases and combustion efficiency deteriorates
Solution Approach 1:
The positioning portion is designed to pre-establish the correct orientation of the injection hole relative to the main combustion chamber before the spark plug is installed. This preliminary positioning ensures that the flame jet is directed toward the optimal region in the main combustion chamber, preventing heat loss and improving combustion efficiency without requiring complex active control mechanisms during operation.
Solution Approach 2:
The positioning portion acts as an intermediary element between the plug cover and the housing. It includes a positioning protrusion that fits into a positioning recess, serving as a mechanical mediator to transmit and fix the orientation relationship. This intermediary structure enables precise orientation control while maintaining relative structural simplicity.
2Productivity
If the injection hole orientation is not controlled, then manufacturing is easier, but combustion efficiency is suboptimal
Solution Approach 1:
The correct orientation of the injection hole is predetermined and fixed during the manufacturing process through the positioning portion design. The positioning protrusion and recess are formed with specific geometries that automatically establish the optimal orientation when assembled, eliminating the need for complex post-manufacturing adjustments or sophisticated assembly procedures.
Solution Approach 2:
The positioning portion employs asymmetric geometry where the positioning protrusion on the plug cover fits into a corresponding positioning recess on the housing. This asymmetric design ensures that only one specific orientation is possible during assembly, automatically achieving the optimal flame jet direction without requiring complex manufacturing processes or multiple components.
3Productivity
If a positioning portion is added to control injection hole orientation, then combustion efficiency improves, but device complexity increases
Solution Approach 1:
The positioning portion is merged with the existing plug cover and housing structures. The positioning protrusion is integrated into the plug cover, and the positioning recess is formed on the housing, combining the positioning function with the structural components rather than adding separate dedicated positioning mechanisms. This reduces overall device complexity while achieving the desired combustion efficiency improvement.
Solution Approach 2:
The positioning portion serves multiple functions: it provides mechanical support, ensures correct orientation, and maintains the sealing relationship between the plug cover and housing. By making the positioning structure multi-functional, the patent avoids adding dedicated components solely for positioning, thereby limiting the increase in device complexity while still improving combustion efficiency.
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 controlled orientation of the flame jet results in enhanced combustion speed and fuel efficiency by optimizing the injection direction relative to the main combustion chamber.
Implementation Method 1
a positioning portion that performs positioning of the housing and the plug cover in a plug circumferential direction is provided in the housing and the plug cover
Implementation Method 2
A flame that is ignited in the pre-combustion chamber is injected from the injection hole into a main combustion chamber, and combustion thereby spreads through the main combustion chamber
Data Source
AI summary
A spark plug includes: a cylindrical insulator; a center electrode that is held on an inner circumferential side of the insulator and includes a tip-end protruding portion that protrudes from the insulator toward a tip end side; a cylindrical housing that holds the insulator on an inner circumferential side; and a plug cover that is provided in a tip end portion of the housing so as to cover a pre-combustion chamber in which the tip-end protruding portion is arranged. The plug cover is provided with an injection hole that communicates the pre-combustion chamber to the outside. A positioning portion that performs positioning of the housing and the plug cover in a plug circumferential direction is provided in the housing and the plug cover.