Impact Rod Guide Geometry for Unloaded Hammer Energy Control
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Solution Overview
Problem
Existing electric tools suffer from ineffective hammering and energy loss due to the inclination of the impact rod, which leads to repeated impacts and reduced energy transfer efficiency when unloaded, and the gap between the impact rod and support part causes low energy transfer efficiency during forward impact.
Innovation Solution
The electric tool incorporates a guide device with a first and second guide part, where the impact rod has varying radial sizes for sections, allowing controlled inclination relative to the air cylinder axis, and includes a stop ring and slip ring to manage the impact rod's movement, preventing separation of the impact hammer from the locking part during unloading and reducing recoil force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gap is provided between the impact rod and support part to allow inclination, then the impact rod can be inclined to prevent ineffective hammering, but energy transfer efficiency decreases during forward impact
Solution Approach 1:
The impact rod is designed with different radial sizes at different sections. The second section has a larger radial size than the third section, creating a localized geometric feature that enables controlled inclination only in specific regions. This local variation allows the impact rod to tilt slightly during unloading to prevent ineffective hammering, while maintaining linear alignment during forward impact for optimal energy transfer.
Solution Approach 2:
The impact rod's inclination is made dynamic rather than fixed. Through the guide device with differently sized sections, the impact rod can dynamically adjust its orientation based on operational requirements - remaining linear during forward impact for efficiency, and tilting during unloading to prevent ineffective hammering. This dynamic adaptability resolves the contradiction between energy efficiency and reliability.
2Reliability
If the impact rod is made to incline during unloading, then repeated impacts on the impact hammer are prevented, but the impact rod requires a gap with support parts that reduces energy transfer efficiency
Solution Approach 1:
The impact rod incorporates localized geometric variations with different radial sizes at specific sections. This local quality differentiation enables the impact rod to achieve controlled inclination during unloading for reliability, without requiring a continuous gap throughout the entire rod structure that would compromise energy transfer efficiency during forward impact.
Solution Approach 2:
The impact rod is segmented into multiple sections with different radial dimensions (first section, second section, third section). This segmentation allows each section to serve different functions: the first section maintains linear alignment for energy transfer, while the second and third sections create the necessary inclination geometry for preventing ineffective hammering during unloading.
3Reliability
If the impact rod is inclined to consume energy during unloading, then the impact hammer is prevented from separating from the locking part, but the gap between impact rod and support part causes low energy transfer efficiency during forward impact
Solution Approach 1:
The impact rod features localized radial size variations that enable inclination only in specific sections (second and third sections) rather than throughout the entire rod. This local quality approach allows energy consumption during unloading for reliability while maintaining linear alignment in the first section for efficient energy transfer during forward impact.
Solution Approach 2:
The impact rod's geometric configuration enables dynamic behavior where the rod remains linear during forward impact for efficiency, and tilts during unloading to consume energy and prevent impact hammer separation. This dynamic adaptability through controlled geometry resolves the contradiction between energy efficiency and reliability.
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 solution prevents ineffective hammering and energy loss by ensuring the impact rod moves linearly during loading, while consuming energy during unloading to prevent impact hammer separation and reducing recoil force, thereby prolonging tool life and improving energy transfer efficiency.
Implementation Method 1
the piston compresses air and drives the impact hammer to impact the impact rod
Implementation Method 2
the impact rod has a first section sliding along the first guide part, and a second section and a third section which slide along the second guide part
Data Source
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AI summary
The present disclosure relates to an electric tool, including a housing, a motor accommodated in the housing, a transmission mechanism, and an impact mechanism, where the impact mechanism includes an air cylinder, and an impact rod, a guide device, an impact hammer, and a piston arranged in the air cylinder; and when the impact rod moves along a direction opposite to an output direction, a second guide part sequentially supports a third section and a second section greater than the third section in diameter. A gap between the second guide part and the third section is added, such that the impact rod is inclined relative to an axis of the air cylinder before moving; when the electric tool is unloaded, the inclination consumes energy of the impact rod moving in the opposite direction to prevent the impact rod from taking the impact hammer away from a locking part, thereby preventing impact when the impact hammer is unloaded from affecting the service life of the electric tool; before the impact rod is impacted, the second guide part supports the second section; and in this case, an axis of the impact rod coincides with the axis of the air cylinder, the impact hammer impacts the impact rod along a linear direction, and the impact rod outputs impact along the linear direction to improve the energy transfer efficiency.