Combustion Chamber Volume Adjustment in Fastener Driving Tools
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Solution Overview
Problem
Existing fastener driving tools lack efficiency and energy management, leading to increased load and reduced service life, especially when driving fasteners at minimum energy levels.
Innovation Solution
A portable combustion-operated fastener driving tool with an adjustable combustion chamber volume and metering valve system, controlled by a motor and electronic control device, allowing for optimal energy adjustment and efficient energy use by combining adjustable combustion chamber volume with precise fuel gas metering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the combustion chamber volume is fixed and fuel gas is supplied without precise metering, then the device structure is simple, but the energy efficiency is poor and load is high
Solution Approach 1:
The combustion chamber volume is made dynamically adjustable through a motor-driven adjusting device that can change the chamber volume according to different operating conditions. This allows the system to optimize combustion efficiency for different fastener types and substrate materials, directly improving energy utilization while managing device complexity through automated control
Solution Approach 2:
The system changes key parameters including combustion chamber volume and fuel gas metering rate based on detected fastener and substrate characteristics. The control device adjusts these parameters in real-time to optimize combustion efficiency and reduce unnecessary energy consumption, thereby improving energy efficiency without proportionally increasing device complexity
2Reliability
If the combustion chamber volume is adjustable with motor control, then the energy range is wide and service life is extended, but the device complexity increases
Solution Approach 1:
The control device receives feedback about the fastener type and substrate material, then automatically adjusts the combustion chamber volume and fuel metering accordingly. This closed-loop control extends service life by preventing overload conditions and optimizing combustion efficiency, while the automated feedback mechanism manages the complexity of the additional adjusting components
Solution Approach 2:
The system performs self-adjustment of combustion chamber volume and fuel metering based on detected conditions, reducing the need for manual intervention and operator judgment. The motor-driven adjusting device and control system work together to automatically optimize performance, extending service life through consistent optimal operation while containing complexity through automation
3Productivity
If precise metering of fuel gas and adjustment of combustion chamber volume are implemented, then energy waste is minimized and productivity increases, but the device complexity and manufacturing cost increase
Solution Approach 1:
The system replaces manual operation and mechanical adjustment with automated electronic control. The control device electronically manages the motor-driven volume adjustment and fuel gas metering, substituting complex mechanical linkages with electronic sensors and actuators. This improves productivity through faster, more precise adjustments while managing overall system complexity through electronic control architecture
Solution Approach 2:
The control device serves multiple functions: detecting fastener and substrate characteristics, adjusting combustion chamber volume, controlling fuel gas metering, and optimizing combustion parameters. This multi-functionality improves productivity across different application scenarios while consolidating control logic to manage the complexity of the additional capabilities
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 tool operates efficiently over a wide energy range, reducing load and extending service life by allowing precise energy adjustment for various fasteners and substrates, minimizing energy waste and enhancing user experience through energy indication and adjustment features.
Implementation Method 1
igniting an ignitable mixture in a combustion chamber so as to drive a fastener
Implementation Method 2
When the ignitable mixture is ignited, it then abruptly expands so as to drive the working piston
Implementation Method 3
The gear mechanism is preferably designed such that a self-locking mechanism causes the same to stay in the current position thereof when under load from the combustion chamber pressure
Implementation Method 4
a metering valve device for metering fuel gas
Implementation Method 5
The motor is mounted in the fastener driving tool preferably with the aid of dampening elements
Data Source
AI summary
A fastener driving tool and method for driving fasteners into a substrate is disclosed. The tool includes a working piston that is capable of being moved abruptly translationally by igniting an ignitable mixture in a combustion chamber so as to drive a fastener, such as a stud or a nail. The volume of the combustion chamber is adjustable. In order to further improve the operation and/or energy efficiency of the fastener driving tool, the fastener driving tool also includes a control device which is connected in a control relationship to an adjusting device for adjusting the combustion chamber volume and to a metering valve device for metering fuel gas.