Valve Seal Positioning for Driving Tool Durability
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Solution Overview
Problem
Existing driving tools using compressed air as a power source face durability issues with seal materials due to exposure to high-temperature and high-pressure combustion gases, and suffer from increased body size due to the need for larger springs to manage these pressures.
Innovation Solution
A driving tool design featuring a valve member with a seal part on its outer peripheral surface and an urging member aligned with the axis of the striking mechanism, minimizing exposure to combustion gases and allowing for a smaller spring size, thus improving seal durability and reducing overall device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the seal material is provided on the end face of the valve in the moving direction, then the valve can be结构简单, but the seal material is exposed to high temperature and high pressure combustion gases, deteriorating durability
Solution Approach 1:
The seal part is repositioned from the end face (one-dimensional exposure) to the outer peripheral surface (circumferential positioning), changing the spatial dimension of seal placement. This dimensional change allows the seal to be protected from direct combustion gas exposure while maintaining valve functionality.
Solution Approach 2:
The valve support member acts as an intermediary structure that holds the seal part on the outer peripheral surface, creating a protective barrier between the combustion gases and the seal material. This intermediary positioning allows the seal to remain functional without direct exposure to harmful thermal and pressure conditions.
2Force
If the spring diameter is increased to manage high temperature and high pressure combusted gas, then the valve can be properly urged, but the size of the main body increases
Solution Approach 1:
The spring is repositioned from a radial arrangement (increasing diameter) to an axial arrangement (aligned with striking mechanism axis). This dimensional change allows the spring to generate sufficient urging force without increasing the radial diameter, thereby maintaining a compact main body size while providing proper valve control.
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 solution enhances seal durability and prevents size increases in the driving tool, enabling efficient operation with improved performance and reduced structural dimensions.
Implementation Method 1
a combustion chamber in which a mixed gas of compressed air and fuel is to be combusted
Data Source
AI summary
A driving tool includes a striking mechanism configured to be actuated by a combustion pressure of a mixed gas of compressed air and fuel, a combustion chamber in which the mixed gas of compressed air and fuel is to be combusted, a valve member configured to open and close communication between the striking mechanism and the combustion chamber, and a valve support member configured to support the valve member. The valve member has a seal part provided on an outer peripheral surface along a moving direction of the valve member.