Torsional Pendulum Vibration Compensation in Hand-Held Power Tools
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Solution Overview
Problem
Hand-held power tools, such as hammer drills, generate vibrations and torques that are troublesome for users due to the cyclic operation, despite the use of various damping systems, which do not effectively mitigate these forces.
Innovation Solution
The implementation of a torsional pendulum in hand-held power tools, which is excited by the generated torques and absorbs them with a time delay, providing a uniform load to the user and dissipating oscillating movements through dissipating elements, thereby reducing the application of torques and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If damping systems are used to dissipate vibrations, then vibration dissipation is improved, but vibrations are still applied to the user
Solution Approach 1:
A counterbalancing mass is introduced as an intermediary element between the vibration source and the user. This mass is positioned to create opposing inertial forces that cancel out the harmful vibrations, allowing the damping system to work more effectively while protecting the user from vibration exposure
Solution Approach 2:
A counterbalancing mass is positioned offset from the tool's axis of rotation to create centrifugal forces that oppose the vibrations generated during operation. This counterweight mechanism actively generates forces that neutralize the harmful vibrations before they reach the user, thereby reducing vibration exposure while maintaining tool functionality
2Object-affected harmful factors
If counterbalancing mass is added to reduce vibrations, then vibration reduction is improved, but device complexity increases
Solution Approach 1:
The counterbalancing mass is integrated into existing structural components of the power tool, such as the housing or handle, allowing it to serve both as a structural element and a vibration compensation mechanism. This multi-functional design reduces the need for separate vibration reduction components, thereby minimizing the increase in device complexity
Solution Approach 2:
The counterbalancing mass is combined with existing structural elements of the tool, merging the vibration compensation function with the tool's structural framework. This integration approach avoids adding separate, complex vibration reduction mechanisms while achieving effective vibration cancellation
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 torsional pendulum effectively absorbs and buffers the troublesome torques, reducing the amplitude of periodic torques and vibrations transmitted to the user, providing a more comfortable handling experience by distributing forces uniformly over time.
Implementation Method 1
the torsional pendulum is suspended for a rotational oscillation about the torsional axis
Implementation Method 2
dissipating elements, which are provided in the torsional pendulum, can damp its oscillating movement
Implementation Method 3
The torsional pendulum can be excited by the generated torque and absorb the excitation with a time delay
Data Source
AI summary
A hand-held power tool (1;101) includes a drive (6;110) located in the power tool housing (2;102) for driving a working tool (111), and a torsional pendulum (4; 120; 220; 320; 420; 520) at least partially mounted on the housing (2; 102) for compensating vibrations generated by the drive (6; 110).