Pivoting Side Handle for Power Tool Vibration Damping
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Solution Overview
Problem
Hand-held power tools face a challenge in balancing the transmission of forces and reduction of vibrations, as stiff elements are required for force transmission but soft elements are needed for effective damping of low-frequency vibrations, while increasing mass for better damping also increases tool weight.
Innovation Solution
A side handle design featuring a pivoting gripping element with a rotational axis, a return element harmonized with vibration frequencies, and an additional mass to function as an active mass damper, dissipating vibration energy with a phase shift, thereby reducing vibrations effectively without significant weight increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If stiff elements are used in the side handle, then force transmission from user to tool is improved, but vibration damping capability deteriorates
Solution Approach 1:
The gripping element is designed to pivot dynamically around a rotational axis, transitioning from a static rigid structure to a dynamic system that can adapt its response based on input frequency. This dynamic behavior enables the element to transmit forces effectively while simultaneously damping vibrations through controlled oscillation and energy dissipation.
Solution Approach 2:
The system changes the physical state and behavior of the gripping element by introducing pivoting capability with specific rotational characteristics. By adjusting parameters such as pivot friction, moment of inertia, and rotational damping, the element can optimize its performance for both force transmission and vibration reduction across different operating conditions.
2Object-affected harmful factors
If soft elements are used in the side handle, then vibration damping capability is improved, but force transmission capability deteriorates
Solution Approach 1:
Rather than using permanently soft elements, the gripping element employs dynamic pivoting behavior that provides vibration-damping characteristics similar to soft elements while maintaining the structural integrity needed for force transmission. The pivot mechanism allows controlled yielding during vibration cycles while preserving stiffness for force application.
Solution Approach 2:
The side handle combines rigid materials for the gripping element and connecting components with the pivot mechanism that introduces controlled compliance. This composite approach integrates both stiff and compliant characteristics in a unified structure, achieving force transmission and vibration damping simultaneously.
3Object-affected harmful factors
If the mass of the side handle is increased to improve damping, then vibration damping capability is improved, but tool weight increases
Solution Approach 1:
The gripping element utilizes mechanical vibration and oscillation around the rotational axis to achieve vibration damping. By tuning the pivot characteristics and moment of inertia, the system creates controlled oscillatory motion that dissipates vibration energy through friction and damping forces, providing effective damping without requiring additional mass.
Solution Approach 2:
Instead of increasing mass, the system achieves vibration damping by changing the dynamic parameters of the gripping element, specifically the pivot friction coefficient, moment of inertia distribution, and rotational damping characteristics. These parameter adjustments enable effective vibration reduction while maintaining lightweight construction.
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 side handle effectively transmits user forces while reducing vibrations through active mass damping, achieving a better compromise between force transmission and vibration reduction with minimal weight increase.
Implementation Method 1
Vibrations introduced via the fastening means cause the gripping element to oscillate. The amplitude of the vibrations is converted into an oscillatory movement and its energy is dissipated and/or the amplitude is once again released with a phase shift relative to the vibrations.
Implementation Method 2
an end area of the gripping element facing the fastening means to have a return element to drive the gripping element back into a basic position relative to the fastening means
Implementation Method 3
an additional mass to be installed on an end area of the gripping element facing the fastening means. This additional mass increases the torque of the oscillating gripping element.
Data Source
AI summary
A side-handle for a hand-held power tool includes a gripping element and a fastener for fastening the side handle to the hand-held power tool. The gripping element and the fastening means can be pivoted with respect to each other around a rotational axis. This rotational axis runs perpendicular to a longitudinal axis of the gripping element and runs through an end area of the gripping element facing away from the fastener.