Motorized Tool Coupling for Vibration and Guidance Trade-off
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Solution Overview
Problem
Motorized working tools, such as abrasive cutting-off devices and sawing devices, face challenges in precise guidance due to excessive vibration dampening, which compromises the ability to accurately place tools on workpieces, especially when dealing with hard materials like steel or granite, as the flexible mechanical coupling between the motor unit and frame unit leads to instability during initial engagement and shallow cuts.
Innovation Solution
Incorporating an abutting element that allows for precise guidance of the motor unit by the frame unit when the tool is not engaged with the workpiece, deactivating the spring dampening system for direct connection, and reverting to vibration dampening when the tool engages, ensuring optimal vibration absorption and tool stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If dampening elements are provided between the motor unit and frame unit, then vibration transmission to the operator is reduced, but the motor unit cannot be readily guided precisely over the frame unit
Solution Approach 1:
The mechanical coupling between motor unit and frame unit is made dynamically adjustable through the abutting element mechanism. When the tool is not engaged with the workpiece, the abutting element provides direct rigid connection for precise guidance. When engaged, the abutting element releases and the dampening elements become active to reduce vibration transmission, allowing the coupling to adapt its characteristics based on operational state.
Solution Approach 2:
The abutting element is positioned specifically to provide rigid guidance only in the regions and conditions where precision positioning is needed (during approach and initial engagement). The dampening elements are configured to become effective specifically when the tool engages with the workpiece and vibrations are generated, creating localized functional zones with different mechanical properties.
2Object-affected harmful factors
If the mechanical coupling between frame unit and motor unit is made very flexible, then vibration dampening is improved, but the ability to sufficiently correct lateral movements during hand guidance is lost
Solution Approach 1:
The system transitions from a rigid coupling (when abutting element is engaged) to a flexible damped coupling (when abutting element releases). This dynamic transition allows the mechanical properties to match the operational requirements: rigidity for guidance stability during approach, flexibility for vibration isolation during cutting.
Solution Approach 2:
The abutting element acts as an intermediary mechanism that mediates between the rigid guidance requirement and the flexible dampening requirement. It selectively engages or disengages based on operational state, controlling whether the dampening elements are active or inactive, thus mediating the mechanical coupling characteristics.
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
Enables precise guidance and accurate placement of tools on workpieces without compromising vibration dampening, preventing lateral breakouts during initial cuts and maintaining effective vibration absorption when engaged, thus improving operational stability and accuracy.
Implementation Method 1
a mechanical coupling is provided between the motor unit and frame unit, which encompasses at least one dampening element
Implementation Method 2
the dampening elements in the mechanical coupling to the frame unit enable acceleration values in the frame unit of below 5 m/s2
Data Source
AI summary
A motor unit has a tool for engaging a work piece with a frame unit, which has a gripping element for the handheld operation of the device, wherein a mechanical coupling is provided between the motor unit and frame unit, which encompasses at least one dampening element, in such a way that makes it possible to precisely guide the tool while improving the dampening of vibrations between the motor unit and frame unit. The frame unit has at least one abutting element, against which the motor unit abuts when a working force exerted by the work piece on the tool has a value below a minimum value.