Eccentric Motor Axis Balancing in Hand-Held Power Tool
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Solution Overview
Problem
Hand-held power tools, such as grinders, face challenges in balancing weight distribution and user comfort when simultaneously driving multiple tiltable grinding disks, leading to fatigue and reduced maneuverability during operations.
Innovation Solution
The design features a motor axis arranged eccentrically relative to the central wheel axis, acting as a counterweight to the handle and storage battery, with a handle housing that protrudes like a barrel handle, allowing for improved weight distribution and balanced operation, enabling smoother running and enhanced user-friendliness by reducing torque and improving visibility during use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the motor is arranged centrally aligned with the central wheel axis, then the structural symmetry is maintained, but the weight distribution becomes unbalanced causing tool vibration and user fatigue
Solution Approach 1:
The motor is positioned eccentrically relative to the central wheel axis, creating a counterbalancing effect that offsets the weight of the handle and storage battery. This eccentric arrangement acts as a counterweight mechanism, distributing the overall tool weight more evenly and reducing vibration during operation, thereby improving user comfort and reducing fatigue.
2Ease of operation
If the handle is positioned to provide ergonomic grip, then user comfort is improved, but the center of gravity shifts causing imbalance and reduced maneuverability
Solution Approach 1:
The eccentric motor arrangement creates a counterbalancing moment that offsets the handle's position and weight. This allows the handle to be positioned ergonomically for comfortable grip while the motor's offset position compensates for the resulting center of gravity shift, maintaining overall tool balance and maneuverability.
3Volume of moving object
If the motor and storage battery are positioned on the same side, then the compact configuration is achieved, but the weight distribution becomes uneven reducing tool balance
Solution Approach 1:
The motor is positioned on one side of the central wheel axis while the storage battery is located in the handle on the opposite side. This opposite arrangement creates a balancing effect where the motor and battery act as counterweights to each other, distributing weight evenly across the tool while maintaining a compact overall configuration.
Data Source
AI summary
A hand-held power tool, in particular a grinder, for simultaneously driving a plurality of grinding plates includes a main housing, which accommodates at least one motor for driving the grinding plates. A handle housing forms a handle and protrudes substantially perpendicularly to the main housing, and in particular the handle housing accommodates a storage battery. The hand-held power tool includes a motor having a drive shaft, which defines a motor axis, a central wheel, which is driven by the motor and defines a central wheel axis, and a plurality of, in particular three, output shafts, which are driven by the central wheel and define respective output shaft axes. Each output shaft is provided for driving one grinding plate or at least one grinding plate receptacle, and the motor axis is arranged eccentrically to the central wheel axis between a front output shaft axis and the central wheel axis.