Impact Tool Cam Mechanism Shock Load Reduction
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Solution Overview
Problem
Impact tools experience durability deterioration due to shock loads applied during high-load screw tightening, which can lead to reduced tool performance and lifespan.
Innovation Solution
The impact tool design includes a motor, a carrier with a reduction assembly, a shaft that receives rotation from the carrier and is rotatable relative to it in an overloaded state, a hammer held by the shaft, and an anvil struck by the hammer. This configuration allows the carrier and shaft to rotate relative to each other, absorbing rotational energy and reducing shock load transmission to internal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the hammer retracts to the rearmost position during high load tightening, then the impact force is maximized for screw tightening, but the shock load transmitted to the spindle through the balls reaches internal components including planetary gears, reducing durability
Solution Approach 1:
The cam mechanism acts as an intermediary between the hammer and the spindle. When the hammer retracts to the rearmost position, the cam groove geometry prevents the balls from transmitting shock loads to the spindle, while still allowing the hammer to generate maximum impact force against the anvil for effective screw tightening
Solution Approach 2:
The cam groove design provides beforehand cushioning by creating a geometric constraint that prevents shock load transmission before it can reach the spindle. The groove shape is designed to absorb and redirect the hammer's retraction motion, cushioning the system against shock loads that would otherwise damage internal components
Data Source
AI summary
Durability deterioration caused by a shock load is effectively reduced. An impact driver includes a motor, a carrier including a reduction assembly and rotatable by the motor, a shaft that receives rotation of the carrier and is rotatable relative to the carrier in an overloaded state, a hammer held by the shaft, and an anvil that is struck by the hammer in a rotation direction.