Power Tool Motor Cooling with Segmented Air Passages
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power tools with elongate tool bits face inefficiencies in cooling motors and other components, leading to increased temperatures and potential damage.
Innovation Solution
The design incorporates independent cooling air passages and fans for the motor and striking parts, allowing for optimized cooling specifications and preventing dust entry, with options for single or dual fans to efficiently cool components while minimizing cost and dust interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single cooling fan is used for both motor and striking part, then device complexity is reduced, but cooling efficiency deteriorates due to inability to optimize for each component
Solution Approach 1:
The cooling system is segmented into two independent cooling fans: a motor cooling fan dedicated to cooling the motor through a motor cooling air passage, and a striking part cooling fan dedicated to cooling the striking part through a striking part cooling air passage. This segmentation allows each fan to be optimized for its specific component, improving overall cooling efficiency while maintaining manageable system complexity.
2Device complexity
If cooling air passages are not separated, then device complexity is reduced, but temperature control deteriorates due to mixed cooling airflow
Solution Approach 1:
The cooling air passages are segmented into separate channels: a motor cooling air passage that delivers cooling air exclusively to the motor, and a striking part cooling air passage that delivers cooling air exclusively to the striking part. This separation ensures that each component receives dedicated cooling airflow, enabling precise temperature control for each component independently.
3Ease of manufacture
If cooling fan is positioned without dust prevention, then ease of manufacture is improved, but reliability deteriorates due to dust entry causing carbon lock
Solution Approach 1:
The cooling fan is positioned and configured to prevent dust from entering the motor interior before dust can cause harmful effects. The motor cooling fan is disposed below the motor and the motor cooling air passage is configured to draw cooling air from below, creating a cooling airflow pattern that prevents dust-laden air from entering the motor through the cooling system, thereby preventing carbon lock and other dust-related failures.
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 configuration effectively prevents temperature increases in critical areas, enhances cooling efficiency, and reduces the risk of dust-related issues like carbon lock, while maintaining cost-effectiveness.
Implementation Method 1
The motor cooling fan is disposed below the motor and activated to supply cooling air to the first cooling air passage when the motor is driven
Implementation Method 2
The striking part cooling fan is disposed between the motor and the motion converting part and activated to supply cooling air to the second cooling air passage when the motor is driven
Data Source
AI summary
A working tool in which a tip tool with a longitudinal shaft is linearly moved, wherein a motor and other tool constituting members are effectively cooled. In order to cool the inside of a motor-driven hammer comprising a main body, a motor, and a motion converter, the hammer is provided with a first cooling air passage through which a cooling air is supplied to the motor, and a second cooling air passage through which a cooling air is supplied to a hammer portion. To generate a cooling air to be supplied to the first and second cooling air passages, a cooling fan is provided at a lower portion of an output shaft of the motor and a hammer portion cooling fan is provided between the output shaft of the motor and the motion converter.