Combustion Chamber Ring Profile for Stable Spark Ignition

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Certain combustion powered fastener driving tools experience inconsistent or incomplete combustion due to turbulence in the combustion chamber directed toward the ignition tip of the spark plug, particularly in cold weather conditions.

Innovation Solution

A combustion chamber ring is designed with a downward sloping profile to redirect vaporized fuel away from the spark plug ignition tip, reducing turbulence and ensuring consistent combustion by configuring the chamber ring to minimize fuel velocity and turbulence.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional combustion chamber ring is used, then the tool structure is simple, but turbulence is directed toward the ignition tip causing inconsistent combustion

Engineering Contradiction:

Improvecombustion consistencyVSAvoidchamber ring structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The chamber ring incorporates a downward sloping profile specifically at the fuel injection zone to redirect turbulence away from the ignition tip. This localized geometric modification creates favorable flow conditions only where needed, improving combustion consistency without requiring complete redesign of the entire chamber ring structure.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The chamber ring uses a curved downward sloping profile instead of a straight or flat configuration. This curvature is optimized to guide the fuel-air mixture flow smoothly away from the ignition tip while maintaining turbulence in beneficial zones, resolving the contradiction between structural simplicity and combustion reliability.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Reliability

If the chamber ring redirects fuel away from the spark plug, then combustion consistency improves, but the chamber ring geometry becomes more complex

Engineering Contradiction:

Improvecombustion completenessVSAvoidchamber ring profile

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The downward sloping profile employs optimized curvature to achieve smooth flow redirection. The curved geometry naturally guides fuel away from the ignition tip while maintaining laminar flow characteristics, improving combustion completeness with a relatively simple continuous surface rather than complex multi-component geometry.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 chamber ring ensures consistent and complete combustion of fuel in various operating conditions, including cold weather, by directing vaporized fuel away from the spark plug, thereby enhancing the tool's operational reliability.

Implementation Method 1

certain known combustion chamber rings can cause the turbulence in the combustion chamber to be directed toward the ignition tip of the spark plug

Methodology Applied

Scientific EffectTurbulence: Turbulence

Implementation Method 2

the vaporized fuel dose in the combustion chamber at and around the injection tip

Methodology Applied

Scientific EffectVaporization: Evaporation

Data Source

PatentEP4436751B1Combustion chamber ring for fastener driving tool

Publication Date: 2025.12.31 ILLINOIS TOOL WORKS INC

Figure 1
Figure 2
Figure 3

AI summary

A combustion powered fastener driving tool including a combustion chamber ring configured to connect the combustion chamber to the cylinder head, the combustion chamber ring configured to reduce turbulence and velocity of vaporized fuel dispensed into the combustion chamber from the fuel cell.