Hand-Held Power Tool Cooling Layout for Battery and Vibration Isolation
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Solution Overview
Problem
Hand-held work tools for cutting and/or abrading hard materials like concrete and stone face challenges with heat generation, vibration, exposure to harsh environments, and inefficient cooling and battery replacement, which affect performance and operator comfort.
Innovation Solution
A hand-held work tool design with vibrationally isolated first and second parts, using a single fan to cool both the electric motor and battery, and a flexible air conduit to minimize vibration and dust ingress, combined with a secure battery lock mechanism for easy and snug 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 battery, then device complexity is reduced, but cooling efficiency for both components must be maintained
Solution Approach 1:
The single fan unit is designed to perform multiple cooling functions simultaneously - cooling both the electric motor and the battery through a shared airflow path. The fan draws ambient air through an intake and directs it through channels that cool both components before exhausting the air, allowing one fan to replace what would traditionally require two separate fan units.
Solution Approach 2:
The cooling system merges the previously separate cooling paths for the motor and battery into a single integrated airflow system. The fan housing includes integrated channels that combine the cooling streams, and the exhaust outlet is positioned to release air after it has passed through both cooling zones, effectively combining two cooling functions into one unified system.
2Ease of operation
If the first part is vibrationally isolated from the second part, then operator comfort is improved, but structural complexity increases
Solution Approach 1:
A vibration isolation element is introduced as an intermediary component between the first part (containing the motor and cutting interface) and the second part (containing the battery and control electronics). This element acts as a mechanical mediator that allows the two parts to remain structurally connected while preventing vibration transmission, thus protecting sensitive components and improving operator comfort without requiring complete structural separation.
3Reliability
If the tool is protected from water and dust, then reliability is improved, but ease of operation may be affected
Solution Approach 1:
The tool employs sealed housings and protective membranes that form flexible barriers against water and dust ingress. These protective elements are integrated into the tool's exterior surfaces and openings, allowing the tool to maintain environmental protection while preserving necessary operational access points for the cutting interface and control elements.
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 design reduces vibration and heat-related issues, enhances cooling efficiency, protects the tool from environmental debris, and facilitates easy battery changes, improving operator comfort and tool longevity.
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
The first part and the second part are arranged vibrationally isolated from each other. by a vibration isolation arrangement, the amount of vibration propagating to the second part is significantly reduced
Data Source
AI summary
A hand-held work tool comprising a first part and a second part arranged vibrationally isolated from each other, the first part comprising an interface for holding a circular cutting tool and an electric motor arranged to drive the circular cutting tool, wherein the electric motor is arranged to drive a fan configured to generate a flow of cooling air for cooling the electric motor, the second part comprising a battery compartment for holding an electrical storage device arranged to power the electric motor, wherein 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.