Annular Hammer Impact Wrench Clutch Alignment
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Solution Overview
Problem
Power driven tools with impact drives often suffer from premature wear and damage due to rapid hammer impacts on anvils, which can occur before alignment is complete, leading to unnecessary stress on components when frictional resistance exceeds the tool's preselected torque.
Innovation Solution
A power driven tool with an impact drive featuring an annular hammer that pivots between three positions – forward, reverse, and disengaged – to ensure proper alignment and impact, reducing unnecessary stress on components and preventing premature wear by only engaging the anvil when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a speed reducing mechanism is used to control impact rate, then component wear and damage is reduced, but device complexity increases
Solution Approach 1:
The hammer is designed to dynamically change its operational state based on real-time conditions. The hammer can be in a first state where it impacts the anvil at a first rate, or a second state where it impacts at a second rate, allowing the system to adapt to varying torque requirements without complex speed reduction mechanisms
Solution Approach 2:
The system changes the impact rate parameter dynamically by transitioning the hammer between different operational states. This allows control of the impact frequency to protect components while maintaining simplicity of the overall mechanism
2Force
If the cam ball repeatedly pushes the impact clutch and hammers axially forward at high speed, then the tool can overcome high frictional resistance, but component damage and wear increases
Solution Approach 1:
The impact drive operates through periodic cycles where the hammer alternates between impacting the anvil and being repositioned by the cam ball. This periodic action allows the system to build up necessary torque while providing rest periods that reduce cumulative wear on components
Solution Approach 2:
The hammer dynamically transitions between different operational states based on the torque requirements. When high torque is needed, the hammer impacts at a higher rate; when torque is sufficient, the impact rate reduces, preventing unnecessary wear
3Productivity
If the hammers impact the anvils before surfaces are fully aligned, then the tool can respond quickly to high frictional resistance, but manufacturing precision and component integrity deteriorates
Solution Approach 1:
The system performs preliminary alignment of the hammer impact surfaces with the anvil before the actual impact occurs. This preliminary positioning ensures that when the hammer does impact, the surfaces are properly aligned, preventing damage while maintaining quick response capability
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 effectively increases torque without using a speed reducing mechanism, maintaining component integrity by ensuring proper alignment and impact sequencing, thus extending the tool's lifespan and preventing unnecessary wear.
Implementation Method 1
The hammers simultaneously impact the anvils producing an increased torque in the output shaft
Implementation Method 2
when frictional resistance of the fastener exceeds a preselected torque output for the tool, the cam ball slides under the impact clutch finger
Data Source
AI summary
A power driven tool for rotating a mechanical element. The tool includes a housing and motor. The motor has an output shaft. The shaft rotates relative to the housing. The tool also includes an impact drive axially fixed within the housing. The impact drive includes a base and an anvil shaft having an anvil. The impact drive includes an annular hammer having opposite impact lands pivotally mounted on the base for movement between three positions, including a forward position in which the hammer is positioned so one impact land engages the anvil, a reverse position in which the hammer is positioned so another of the impact lands engages the anvil, and a disengaged position in which neither of the impact lands engages the anvil. Further, the tool includes a ratchet mechanism. The ratchet mechanism includes an output drive mounted for rotation relative to the housing for rotating a mechanical element.