Driving Tool Seal Lubrication via Spring Guide Reservoirs
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Solution Overview
Problem
Existing driving tools face challenges in maintaining sufficient lubrication of seal members between the head valve and housing/cylinder, leading to reduced wear resistance and durability due to grease depletion during high-speed reciprocation, especially in narrow and dead-end structural configurations.
Innovation Solution
Incorporating a spring guide with integrated grease reservoirs on both outer and inner circumferences, along with a scraping mechanism to replenish grease to seal members, ensuring continuous lubrication and preventing air leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grease is applied to seal members for lubrication, then sliding ability and air-tightness are improved, but grease gradually decreases during high-speed reciprocation causing wearing resistance to reduce
Solution Approach 1:
Grease reservoirs are pre-filled with grease and positioned to contact the head valve at specific locations. The grease is prepared in advance and automatically supplied to seal members during head valve reciprocation, eliminating the need for external grease application and ensuring continuous lubrication throughout the tool's operational life.
2Reliability
If the variable pressure chamber and exhaust chamber are separated by seal members, then air-tightness is improved, but the narrow dead-end structure makes grease application difficult
Solution Approach 1:
The head valve itself serves as the grease distribution mechanism. Grease reservoirs are attached to the head valve, allowing it to automatically supply grease to its own seal members during reciprocation. This self-service approach eliminates the need for external grease application equipment and makes the narrow dead-end structure accessible for lubrication.
3Reliability
If mist-like lubricant is contained in compressed air for maintenance, then lubrication is provided, but sufficient lubricant cannot reach the seal member in narrow spaces
Solution Approach 1:
The grease supply system is extracted from the compressed air maintenance method and integrated directly onto the head valve structure. Grease reservoirs are physically attached to the head valve at locations that directly contact the seal members, extracting the lubrication function from the air delivery system and placing it where it is most effective for reaching difficult-to-access seal areas.
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 effectively maintains the lubrication of seal members, enhancing wear resistance and durability by providing a consistent grease supply to critical areas, thereby preventing air leakage and extending the tool's operational life.
Implementation Method 1
a compression spring that is disposed between the head valve and the spring guide so as to bias the head valve in a closing direction in which the head valve closes the communication between the piston upper chamber and the accumulator
Implementation Method 2
Grease (lubricant) is applied to the seal member in order to provide air-tightness as well as sliding ability
Data Source
AI summary
A driving tool is provided with first and second grease reservoirs for supplying grease to seal rings present on the outer and inner peripheral circumferences of a head valve in contact with a spring guide. Because of this configuration, wearing off of resistance of the seal rings due to gradual loss of grease can be improved and air leakage therefrom can also be prevented, which can improve durability of the driving tool.