Impact Tool Hammer Inertia Ratio for Efficient Energy Transfer
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Solution Overview
Problem
Existing impact tools suffer from inefficiencies in energy transfer due to clearances and imbalances between the hammer and anvil, leading to significant energy loss without effectively tightening fastening members.
Innovation Solution
The impact tool design increases the moment of inertia of the hammer relative to the anvil by incorporating a skirt part or a combination of main and sub-hammers, ensuring the hammer's moment of inertia is 10 or more times that of the anvil, thereby optimizing energy transfer and reducing energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the hammer and anvil have comparable moments of inertia, then the device structure remains compact and simple, but energy transfer efficiency deteriorates due to clearances and imbalances
Solution Approach 1:
The patent applies parameter changes by modifying the moment of inertia of the hammer relative to the anvil. Specifically, the hammer is designed with a moment of inertia that is 10 or more times greater than that of the anvil, which fundamentally changes the dynamic characteristics of the impact mechanism. This parameter adjustment optimizes energy transfer efficiency by reducing the impact of clearances and imbalances during operation.
2Loss of energy
If the hammer's moment of inertia is increased significantly, then energy efficiency improves, but the tool size and weight increase
Solution Approach 1:
The patent applies local quality by concentrating mass distribution in specific regions of the hammer to achieve the required moment of inertia ratio. Instead of uniformly increasing the hammer's mass throughout, the design focuses mass strategically to optimize the moment of inertia while controlling overall weight and tool dimensions.
3Loss of energy
If the hammer's moment of inertia is increased significantly, then energy efficiency improves, but the tool size increases
Solution Approach 1:
The patent applies local quality by concentrating mass distribution in specific regions of the hammer to achieve the required moment of inertia ratio. Instead of uniformly increasing the hammer's mass throughout, the design focuses mass strategically to optimize the moment of inertia while controlling overall weight and tool dimensions.
4Force
If conventional hammer and anvil design is used, then device complexity remains low, but torque output and tightening effectiveness deteriorate
Solution Approach 1:
The patent applies parameter changes by modifying the moment of inertia of the hammer relative to the anvil. Specifically, the hammer is designed with a moment of inertia that is 10 or more times greater than that of the anvil, which fundamentally changes the dynamic characteristics of the impact mechanism. This parameter adjustment optimizes energy transfer efficiency by reducing the impact of clearances and imbalances during operation.
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
This design improves energy efficiency, allowing for more effective tightening of fastening members with increased torque and reduced noise and heat generation, while maintaining a compact tool size.
Implementation Method 1
moment of inertia of the hammer around the rotation axis is 10 or more times moment of inertia of the anvil around the rotation axis
Data Source
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AI summary
An object of the present disclosure is to improve energy efficiency. An impact tool (1) includes a motor (3), a hammer (42), and an anvil (45). The hammer (42) is configured to be rotated around a rotation axis (Axl) by motive power provided from the motor (3). The anvil (45) is configured to be rotated around the rotation axis (Axl) by receiving striking force from the hammer (42) in a circumferential direction of the rotation axis (Axl). In the impact tool (1), moment of inertia of the hammer (42) around the rotation axis (Axl) is 10 or more times moment of inertia of the anvil (45) around the rotation axis (Axl).