Hand-Held Cutting Tool Cooling Layout for Battery Heat and Vibration
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Solution Overview
Problem
Hand-held electric tools used for cutting concrete and stone face issues with heat generation, vibration, and exposure to harsh environments, leading to operator discomfort and potential tool failure due to dust and slurry accumulation.
Innovation Solution
The design incorporates a vibrationally isolated dual-part structure, where the first part houses the cutting tool and electric motor with a fan for cooling, and the second part contains the battery compartment, using a single fan to efficiently cool both components and prevent dust accumulation through a bellows or flexible conduit, while a battery lock mechanism ensures easy and secure battery insertion and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single fan is used to cool both the electric motor and the battery, then device complexity is reduced, but cooling efficiency for each component may be compromised
Solution Approach 1:
The single fan is segmented into two functional zones: an axial fan portion for cooling the electric motor and a radial fan portion for directing cooling air to the battery compartment. This segmentation allows one fan to perform two cooling functions effectively
Solution Approach 2:
The fan assembly is designed as a multi-functional component where the axial and radial fan portions work together to cool both the motor and battery, making a single fan unit serve multiple thermal management purposes
2Object-affected harmful factors
If the first part and second part are vibrationally isolated from each other, then operator comfort is improved, but structural complexity increases
Solution Approach 1:
The tool is divided into two vibrationally isolated parts: the first part containing the motor and cutting tool, and the second part containing the battery and handle. This segmentation isolates vibration sources from the operator's hand
Solution Approach 2:
A flexible air conduit acts as an intermediary element connecting the two vibrationally isolated parts, allowing air flow passage while maintaining vibration isolation and accommodating relative movements between parts
3Ease of operation
If the battery compartment is exposed to the same environment as the cutting zone, then ease of operation is maintained, but dust and slurry accumulation increases
Solution Approach 1:
The battery compartment is segmented as a separate sealed unit isolated from the cutting zone environment, protecting it from dust and slurry while maintaining easy accessibility for battery changes
Solution Approach 2:
A flexible air conduit with bellows structure provides a sealed yet flexible connection between the cutting zone and battery compartment, preventing dust ingress while accommodating vibrations and movements
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 solution reduces operator discomfort by minimizing vibration, enhances cooling efficiency, and prevents dust and slurry entry, thereby extending tool lifespan and improving operational safety and convenience.
Implementation Method 1
The electric motor is arranged to drive a fan configured to generate a flow of cooling air for cooling the electric motor
Implementation Method 2
A cooling air conduit is arranged to guide a portion of the flow of cooling air from the first part and into the second part for cooling the electrical storage device
Implementation Method 3
a first part and a second part arranged vibrationally isolated from each other
Data Source
AI summary
A hand-held work tool (100) comprising a first part (110) and a second part (120) arranged vibrationally isolated from each other, the first part (110) comprising an interface for holding a circular cutting tool (130) and an electric motor (140) arranged to drive the circular cutting tool, wherein the electric motor (140) is arranged to drive a fan (145) configured to generate a flow of cooling air for cooling the electric motor (140), the second part (120) comprising a battery compartment (150) for holding an electrical storage device arranged to power the electric motor (140), wherein a cooling air conduit is arranged to guide a portion of the flow of cooling air (160) from the first part (110) and into the second part (120) for cooling the electrical storage device.