Handheld Electric Tool Cooling and Control Mechanisms
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Solution Overview
Problem
Traditional handheld power tools face issues with heat dissipation, leading to malfunctions and damage, and have unsatisfactory speed control mechanisms and wobbly transmission shafts during assembly, along with difficulties in refueling due to loose tank covers.
Innovation Solution
The design includes a power housing with a fan for airflow to dissipate heat efficiently through the electric motor and circuit board, a symmetrical layout for improved cooling, a manipulating handle for ergonomic speed control, and a sleeve device for secure connection of shafts, along with a locking assembly to prevent the tank cover from detaching during refueling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional powering device arrangement is used, then device structure is simple, but heat generated by electric motor and circuit board cannot be dissipated in time leading to malfunction and damage
Solution Approach 1:
The power housing is divided into multiple air inlet ports and air outlet ports positioned at different locations. The airflow path is segmented to pass through circuit board, transmission mechanism, and electric motor sequentially, allowing targeted cooling of each component section
Solution Approach 2:
A fan is introduced as an intermediary device to actively generate and direct airflow through the power housing. The fan creates a controlled air current that serves as a heat transfer medium, carrying heat away from the electric motor, circuit board, and transmission mechanism
2Ease of operation
If manipulating member for speed control is disposed just above handle, then device structure is compact, but it becomes difficult for user to control speed while also controlling trigger
Solution Approach 1:
The speed control manipulating member is repositioned from a vertical arrangement (above the handle) to a lateral arrangement (at the side of the handle). This dimensional change in positioning allows the user's thumb to easily access the speed control while the index finger operates the trigger, eliminating operational interference
3Ease of operation
If two detachable long-rod structures are used, then transportation and storage are facilitated, but transmission shafts have large degree of freedom producing wobble making combination difficult
Solution Approach 1:
Positioning structures are pre-formed on the transmission shafts and connecting components before assembly. These pre-formed positioning features (such as alignment pins or keyed structures) guide the transmission shafts into correct relative positions during assembly, preventing wobble and ensuring accurate connection without requiring complex adjustment procedures
4Ease of operation
If tank cover is often disassembled for refueling, then refueling is enabled, but tank cover is easily lost
Solution Approach 1:
The tank cover is merged with the main body structure through an integrated design where the cover forms a unified structure with the fuel tank assembly. This integration reduces the likelihood of the cover being separated and lost during normal operation and refueling procedures
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 solution enhances cooling efficiency, improves speed control usability, reduces wobble during assembly, and secures the tank cover during refueling, resulting in a more reliable and user-friendly handheld electric tool.
Implementation Method 1
a fan driven by the electric motor, a power housing disposed with an air inlet for allowing an airflow to enter into the power housing during the fan rotating and an air outlet for allowing the airflow to be exhausted out of the power housing during the fan rotating
Data Source
AI summary
A handheld electric tool includes a working device for performing a function of the handheld electric tool, a powering device for provide a driving force to the working device, and a connecting device for connecting the working device and powering device. The powering device includes: an electric motor, a power housing having an air inlet and an air outlet, a transmission mechanism for transmitting power generated by the electric motor and a circuit board for controlling the electric motor, a fan can be driven by the electric motor to provide an airflow which flows from the air inlet to the air outlet. The circuit board, the transmission mechanism and the electric motor are disposed between the air inlet and the air outlet such that the airflow flows through the circuit board, the transmission mechanism and the electric motor successively. The handheld electric tool has excellent cooling effect.