Rotating Working Tool Air Intake Layout for Motor Cooling
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Solution Overview
Problem
Handheld working tools like trimmers and cutting machines face issues with motor overheating due to inadequate cooling, particularly when the air intake hole is covered by the handle during rotation, and hot airflow mixing with cold airflow within the motor housing, reducing cooling efficiency.
Innovation Solution
The design includes strategically positioned air intake holes that remain accessible at any angular position, and a partition plate within the motor housing to ensure hot airflow is only discharged through the exhaust hole, preventing mixing with cold airflow, thus maintaining efficient cooling and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the air intake hole is positioned in the working component, then the working component can be rotated to increase working angle, but the air intake hole may be covered by the handle when rotated to certain angles, affecting motor cooling
Solution Approach 1:
The housing is divided into a handle portion and a working component portion, with the air intake hole positioned in the working component portion. This segmentation allows the air intake function to be separated from the rotating working component, ensuring continuous air supply regardless of rotation angle.
Solution Approach 2:
An air passage is introduced as an intermediary structure within the working component. The air intake hole communicates with the motor housing through this air passage, creating a dedicated airflow channel that remains functional even when the working component rotates relative to the handle.
2Device complexity
If the motor housing is an integral cavity, then the structure is simple, but hot airflow mixes with cold airflow or flows to the output end, reducing cooling efficiency
Solution Approach 1:
The motor housing is segmented into distinct functional zones: a motor housing cavity for the motor, an air passage for cool air flow, and a hot air discharge passage for hot air exit. This segmentation prevents mixing of hot and cold airflows while maintaining a relatively simple overall structure.
Solution Approach 2:
Different regions of the housing are given different functional qualities: the air intake hole and air passage are designed for cool air intake, the motor housing cavity accommodates the motor, and the hot air discharge passage is positioned to efficiently expel hot air. Each region is optimized for its specific function to maximize cooling efficiency.
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 arrangement ensures continuous airflow for cooling the motor, maintaining its efficiency and performance regardless of the working angle, and prevents hot airflow from interfering with the motor's output, enhancing overall cooling efficiency and device performance.
Implementation Method 1
a driving component provided with an air intake hole to allow air for cooling an electric motor to enter an interior of the driving component
Implementation Method 2
a partition plate is provided in an electric motor housing, ensuring that the hot airflow that has passed through the electric motor can only be discharged from an exhaust hole without entering other areas in the electric motor housing, in particular without mixing with a cold airflow that will flow to the electric motor
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
The present invention provides a working device (100), comprising a working portion (20) and a grip portion (30). The working portion (20) comprises a driving component (21) and a working component (22) driven by the driving component. The driving component (21) comprises an electric motor (216) and an electric motor housing. The electric motor housing comprises a housing body and a connecting portion (212) located on a rear side of the housing body. At least one air intake hole (212a,212b) is formed in the connecting portion (212), and is in communication with an inner cavity of the housing body. In the working device (100) of the present invention, the driving component (21) is provided with an air intake hole to allow air for cooling an electric motor (216) to enter the interior of the driving component (21). Further, the working portion (20) can be rotated with respect to the grip portion (30) so as to have an increased working angle, and it can also be ensured that at least one air intake hole (212a,212b) is always in communication with the outside when the working portion (20) is in any angular position, so that the use efficiency of the electric motor (216) can be ensured under any use condition.