Pneumatic Impact Tool Vibration Reduction via Hammer Exhaust
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Solution Overview
Problem
Conventional pneumatic hammers generate significant vibration due to the reciprocating movement of the hammer member, leading to user discomfort, and existing vibration reduction methods, such as gas-filled spaces or springs, are inefficient and costly.
Innovation Solution
A pneumatic impact tool design featuring an exhaust channel on the hammer member that communicates with the front chamber portion, allowing gas to be exhausted at the beginning of the returning process, thereby reducing the force pushing the hammer member back and minimizing vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If gas is used to push the hammer member to return, then the hammer member returns quickly, but vibration is generated due to high-speed impact
Solution Approach 1:
The exhaust channel is positioned to allow gas to be exhausted at the beginning of the returning process, before the hammer member completes its full return stroke. This preliminary exhaustion reduces the gas pressure pushing the hammer member during the critical phase when it approaches the rear end, thereby reducing the high-speed impact and generated vibration while still allowing the hammer member to return quickly initially
Solution Approach 2:
The patent changes the parameter of gas pressure during the return process by providing an exhaust channel that opens at a specific position. This causes the gas pressure to decrease progressively as the hammer member returns, transforming the constant high pressure into a decreasing pressure profile that reduces impact velocity and vibration at the end of the return stroke
2Object-generated harmful factors
If additional components such as springs or rubber chunks are added to cushion vibration, then vibration is reduced, but device complexity and cost increase
Solution Approach 1:
The invention extracts the vibration reduction function from separate additional components (springs, rubber chunks, gas-filled spaces) and integrates it directly into the existing hammer member structure through the exhaust channel. This eliminates the need for separate vibration cushioning components while achieving the same vibration reduction effect
Solution Approach 2:
The exhaust channel serves multiple functions: it controls gas pressure during the return process, reduces vibration, and is integrated into the hammer member structure. This multi-functional design eliminates the need for separate dedicated vibration cushioning components, simplifying the overall device structure
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 early exhaustion of gas during the returning process significantly reduces vibration, improving user comfort while maintaining the tool's output power by weakening the force pushing the hammer member back without affecting the hitting force.
Implementation Method 1
The hammer member is pushed by high pressure gas to move toward the tool member if high pressure gas is guided into the rear chamber portion through the second gas inlet
Implementation Method 2
Gas in the front chamber portion is exhausted through the exhaust channel and the at least one vent to lower a force pushing the hammer member when the exhaust channel communicates with the at least one vent
Data Source
AI summary
A pneumatic impact tool having a vibration reducing structure includes a handle with a bucket member and a directional control valve. A tube member including a cylindrical wall and a chamber is coupled with the bucket member. The chamber is divided into a front and a rear chamber portion by a hammer member. Gas may be guided into the front or the rear chamber portion by the directional control valve. A vent is disposed on the cylindrical wall. An exhaust channel which communicates with the front chamber portion and not communicates with the rear chamber portion is disposed on an outer peripheral surface of the hammer member. The hammer member is pushed to return if gas is guided into the front chamber portion. Gas in the front chamber portion is exhausted when the exhaust channel communicates with the vent.