Driving Tool Sub-Motor Cooling Fan Segmentation
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Solution Overview
Problem
Existing driving tools for driving members into a workpiece face challenges in efficiently cooling electrical components, particularly due to the short operation time of the main motor, which limits the duration of cooling air flow.
Innovation Solution
The driving tool incorporates a sub-motor that operates independently from the main motor, allowing it to drive longer and extend the time for cooling air to circulate and cool the electrical components, including the main motor, sub-motor, and other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the main motor is used as the sole driving source, then the device complexity is reduced, but the cooling duration is insufficient because the main motor operates only during brief driving cycles
Solution Approach 1:
The motor system is segmented into two independent motors: the main motor for driving the driver during operation, and the auxiliary motor dedicated solely to driving the fan for cooling. This segmentation allows each motor to be optimized for its specific function and enables the cooling function to operate independently from the driving cycles, thereby extending the cooling duration without significantly increasing overall system complexity.
Solution Approach 2:
The auxiliary motor serves the universal function of driving the fan to provide cooling for all electrical components including both the main motor and auxiliary motor themselves. This multi-functional approach allows a single auxiliary motor to handle the cooling needs of the entire electrical system, achieving extended cooling duration while maintaining reasonable device complexity.
2Reliability
If the fan is mounted on the main motor output shaft, then the device complexity is minimized, but the cooling effectiveness is insufficient due to the short operating time
Solution Approach 1:
The fan is segregated from the main motor output shaft and instead mounted on the auxiliary motor output shaft. This segmentation ensures that the fan's rotation and cooling air generation are controlled by the auxiliary motor independently, allowing the fan to operate for extended periods regardless of the main motor's brief driving cycles, thereby significantly improving cooling effectiveness.
Solution Approach 2:
The auxiliary motor acts as an intermediary between the power source and the fan, mediating the driving force specifically for cooling purposes. This intermediary arrangement allows the fan to be driven by a dedicated motor that can operate independently from the main driving cycles, ensuring reliable and extended cooling effectiveness while maintaining a manageable motor configuration.
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 enhances the cooling efficiency of the electrical components by ensuring a longer duration of cooling air flow, effectively addressing the insufficient cooling issue in existing tools.
Implementation Method 1
A fan is mountable on an output shaft of the sub-motor... the fan rotates integrally with the output shaft of the sub-motor to generate cooling air
Data Source
AI summary
A driving tool has a main motor, a sub-motor, and a fan. The main motor serves as a driving source to generate electric power to move a driver and is accommodated in a main body housing. The sub-motor is driven independently from the main motor and accommodated in the main body housing. The fan is mounted on an output shaft of a sub-motor.