Impact Tool Housing Materials for Strength Without Added Weight
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Solution Overview
Problem
High-strength materials used in impact tools increase weight, leading to reduced workability due to their high specific gravity.
Innovation Solution
The motor case and gear case of the impact tool are made of a magnesium alloy, providing high strength and light weight, while the hammer case is made of aluminum to withstand impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-strength material is used to withstand impact, then strength is improved, but weight increases due to high specific gravity
Solution Approach 1:
Different parts of the tool are made from different materials optimized for their specific functions: the hammer case and anvil use high-strength steel for impact resistance, while the motor case and gear case use magnesium alloy for light weight, and the handle uses fiber-reinforced resin for durability and comfort. This local differentiation resolves the contradiction by applying strength only where impact resistance is needed.
Solution Approach 2:
The tool employs composite construction combining multiple materials: steel components (hammer, anvil) provide impact strength, magnesium alloy (motor case, gear case) provides lightweight structure, and fiber-reinforced resin (handle) provides durability. This composite approach allows the tool to achieve both high strength for impact withness and reduced overall weight.
2Reliability
If high-strength material is used for motor case and gear case, then durability is improved, but workability deteriorates due to increased weight
Solution Approach 1:
The motor case and gear case are specifically designated as regions where weight reduction is prioritized over maximum strength, as these components do not directly承受 impact forces. Using magnesium alloy in these specific locations maintains durability while significantly reducing overall tool weight, thereby preserving workability.
Solution Approach 2:
The combination of magnesium alloy in non-impact components (motor case, gear case) with steel in impact components (hammer, anvil) creates a composite structure that achieves adequate durability through material distribution rather than uniform high-strength material usage, thus maintaining ease of operation.
Data Source
AI summary
An impact tool includes: a motor; a speed reduction mechanism rotated by the motor; a hammer rotated by rotation of the motor transmitted via the speed reduction mechanism; an anvil to be impacted in a rotation direction by the hammer; a motor case accommodating the motor; and a gear case accommodating the speed reduction mechanism. One or both of the motor case and the gear case are made of a magnesium alloy.