Hammer Drill Impact Mechanism Gas Space Optimization
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Solution Overview
Problem
Existing hammer drills face a trade-off between increasing impact frequency for improved efficiency and maintaining tool stability, as higher impact frequencies can lead to instability and impact dead points.
Innovation Solution
The hammer drill incorporates an impact mechanism with a gas space between the impact block and the impact power piece, where the minimum length of the gas space is optimized to be less than or equal to 13 mm, allowing for enhanced peak and average gas pressure, thus increasing impact energy and efficiency while minimizing the impact dead point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If impact frequency is increased to improve working efficiency, then productivity is improved, but tool stability deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the gas space length parameter to be within a specific range (5-15mm). This parameter optimization enables the impact mechanism to achieve high impact frequencies (4000-6000 BPM) while maintaining tool stability, resolving the contradiction between productivity and stability.
Solution Approach 2:
The patent utilizes pneumatic principles by introducing a gas space between the impact block and impact power piece. The gas pressure generated in this space provides controlled impact forces that enable high-frequency impacts without compromising tool stability, thus improving productivity while maintaining stability.
2Productivity
If impact frequency is increased to improve working efficiency, then productivity is improved, but impact dead points increase
Solution Approach 1:
The patent optimizes the gas space length parameter to prevent impact dead points. By controlling the gas space to be within 5-15mm, the impact mechanism maintains reliable operation at high frequencies (4000-6000 BPM) without experiencing dead points, thus improving productivity while ensuring reliability.
Solution Approach 2:
The gas space configuration creates a feedback mechanism where gas pressure dynamically adjusts based on impact conditions. This feedback control ensures continuous reliable operation at high impact frequencies by preventing dead points and maintaining consistent impact force.
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 configuration enables the hammer drill to achieve higher impact frequencies (e.g., ≥4500 BPM) without compromising stability, resulting in increased impact energy and efficiency, and preventing impact dead points.
Implementation Method 1
A gas space is provided between a rear end of the impact block and the impact power piece. A length of the gas space in a direction of the mounting direction is less than or equal to 13 mm when the impact block is at an impact position.
Data Source
AI summary
A power tool includes a motor, a drive mechanism, and an impact mechanism. The drive mechanism is capable of driving a tip functional element to rotate about an output axis. The impact mechanism is capable of abutting against the tip functional element and capable of driving the tip functional element. The impact mechanism includes an impact rod, an impact power piece, and an impact block. The impact rod abuts against the tip functional element. The impact power piece is used for generating impact power. The impact block is disposed between the impact rod and the impact power piece, capable of forming a gas space with the impact power piece, and capable of reciprocating when impacted by the impact power generated by the impact power piece. A minimum length of the gas space in a direction of the output axis is less than or equal to 13 mm.