Hand-Held Power Tool Battery Counterweight Vibration Reduction
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Solution Overview
Problem
Hand-held power tools with vibration drives often experience vibrations that impair handling and long-term operation.
Innovation Solution
The battery unit is positioned with its center of gravity on the side of the longitudinal axis opposite the tool holding fixture, acting as a counter-weight to balance the workspindle and reduce vibrations, while maintaining ergonomic design and flexibility through adjustable angles and exchangeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the battery unit is positioned to balance the workspindle as a counter-weight, then vibrations are reduced and handling is improved, but the device complexity increases due to specific positioning requirements
Solution Approach 1:
The battery unit is positioned with its center of gravity on the side of the longitudinal axis opposite the tool holding fixture, acting as a counter-weight to balance the workspindle. This counterbalancing arrangement reduces vibrations by offsetting the centrifugal forces generated during oscillation, directly addressing the harmful vibrations without requiring additional vibration damping components.
Solution Approach 2:
The battery unit serves dual functions: providing electrical energy to the drive motor and acting as a counter-weight for vibration reduction. By positioning the battery unit's center of gravity strategically, the same component performs both power supply and vibration balancing, avoiding the need for separate counter-weight elements and thus not increasing device complexity.
2Ease of operation
If the battery unit is positioned with center of gravity on the opposite side of the longitudinal axis, then handling safety is enhanced, but the weight distribution becomes more complex
Solution Approach 1:
The battery unit's center of gravity is positioned on the side of the longitudinal axis opposite the tool holding fixture, creating a counterbalancing effect that reduces vibrations and improves handling safety. This counter-weight arrangement compensates for the uneven weight distribution caused by the tool holding fixture, resulting in more balanced handling characteristics.
3Productivity
If the workspindle oscillates at high frequency with large amplitude, then cutting performance is improved, but vibrations increase and impair handling
Solution Approach 1:
The battery unit positioned as a counter-weight directly opposes the centrifugal forces generated by the oscillating workspindle. By placing the battery unit's center of gravity on the opposite side of the longitudinal axis, the system creates a balancing moment that reduces vibrations even when the workspindle operates at high frequency and amplitude, thereby maintaining cutting performance while improving handling.
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 significantly reduces user-perceived vibrations and noise, enhancing handling safety and flexibility by allowing the tool to be used in various gripping positions and orientations.
Implementation Method 1
The battery unit has a center of gravity which is located on a side of the longitudinal axis opposite the tool holding fixture... the workspindle, which can be driven to oscillate, and the tool that is located on the drive spindle outside the housing, are balanced by a counter-weight provided on the side of the longitudinal axis opposite the tool
Data Source
AI summary
A power-driven hand-held tool is disclosed. It comprises a housing, a drive motor arranged in the housing and having a motor shaft that defines a longitudinal axis, a workspindle comprising a tool holding fixture arranged outside the housing for holding a tool, wherein the workspindle defines a spindle axis arranged at an angle relative to the longitudinal axis, wherein at least one battery unit is provided for supplying the drive motor with energy, wherein the drive motor is coupled to the workspindle for driving same oscillatingly about the spindle axis, wherein a center of gravity of the battery unit is located on a side of the longitudinal axis opposite the tool holding fixture.