Rotatable Motor Housing Venting for Handheld Tool Cooling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing handheld working devices, such as 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 in the connecting portion of the electric motor housing that remain in communication with the outside at any angular position, ensuring continuous airflow for cooling, and a partition plate within the housing to prevent hot airflow from mixing with cold airflow, enhancing cooling efficiency and maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the air intake hole is positioned in the working component, then the cooling function is provided, but the air intake hole may be covered by the handle when the working component is rotated, affecting cooling effect
Solution Approach 1:
The air intake function is segmented from the working component and relocated to the connecting portion, which remains stationary relative to the handle. This allows the working component to rotate freely while the air intake hole maintains its position, resolving the conflict between cooling effectiveness and working angle range.
Solution Approach 2:
The connecting portion acts as an intermediary structure between the handle and the working component. By positioning the air intake hole in this intermediate section, the patent ensures that the cooling pathway remains independent of the working component's rotation, allowing both full rotational range and effective cooling.
2Ease of manufacture
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 effect
Solution Approach 1:
The motor housing is segmented into distinct functional zones using a partition plate that divides the integral cavity into a cooling air passage and an exhaust passage. This segmentation prevents hot and cold airflow mixing while maintaining the overall simplicity of the integrated housing structure.
Solution Approach 2:
The hot airflow path is extracted and separated from the cold airflow path within the housing. The partition plate removes the harmful mixing of airflows by creating dedicated channels, ensuring that exhaust air does not re-enter the cooling pathway or affect the motor output end.
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 effective cooling of the electric motor at any working angle, preventing overheating and maintaining the performance of the motor and connected working components, thereby improving the overall efficiency and reliability of the device.
Implementation Method 1
an air intake hole and an exhaust hole that are in communication with the outside may be formed in a motor housing
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
Data Source
AI summary
The present invention provides a working device, comprising a working portion and a grip portion. The working portion comprises a driving component and a working component driven by the driving component. The driving component comprises an electric motor and an electric motor housing. The electric motor housing comprises a housing body and a connecting portion located on a rear side of the housing body. At least one air intake hole is formed in the connecting portion, and is in communication with an inner cavity of the housing body. In the working device of the present invention, the driving component is provided with an air intake hole to allow air for cooling an electric motor to enter the interior of the driving component. Further, the working portion can be rotated with respect to the grip portion so as to have an increased working angle, and it can also be ensured that at least one air intake hole is always in communication with the outside when the working portion is in any angular position, so that the use efficiency of the electric motor can be ensured under any use condition.