Impact Tool Cover Cooling Through Vibration-Driven Airflow
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Solution Overview
Problem
Existing cooling methods for working devices, such as impact devices, are insufficient in cooling the metal case and electronic components due to reduced airflow when the metal case and fan separate, leading to excessive temperature rise.
Innovation Solution
A working device with a cover that allows airflow passage between the enclosure and the cover, utilizing the device's vibration to adjust airflow volume, and incorporating vents and gaps for air intake and exhaust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling air is used to cool the motor and metal case, then the motor and metal case are cooled, but the cooling effect becomes insufficient when the metal case and fan separate from each other
Solution Approach 1:
The patent divides the cooling function into two separate cooling paths: one for the motor (through the fan) and another for the metal case (through the airflow passage between cover and enclosure). This segmentation allows each component to be cooled independently, ensuring the metal case receives sufficient cooling air even when separated from the fan.
Solution Approach 2:
The patent introduces an airflow passage with vents and gaps as an intermediary mechanism between the outside air and the metal case. This passage ensures that cooling air can reach the metal case surface effectively, maintaining reliable cooling performance regardless of the distance between the fan and metal case.
2Temperature
If a cover is added outside the enclosure portion for cooling, then the enclosure portion can be cooled, but the structure becomes more complex
Solution Approach 1:
The cover serves multiple functions: it protects the enclosure portion and simultaneously acts as a cooling component by forming an airflow passage with the enclosure. The gaps between the cover and enclosure serve both as structural spacing elements and as air intake/exhaust paths, reducing the need for additional dedicated cooling structures.
Solution Approach 2:
The patent utilizes the gap space between the cover and enclosure as a flexible airflow channel. This thin film-like air passage allows cooling air to flow along the outer surface of the enclosure without requiring rigid, complex cooling ducts or channels.
3Temperature
If the cover is made movable to adjust airflow volume through vibration, then the cooling efficiency is improved, but the device becomes less stable
Solution Approach 1:
The patent makes the cover movable relative to the enclosure, allowing the airflow passage area to dynamically adjust during device operation. The cover can shift position to increase or decrease gap size, thereby controlling airflow volume and cooling intensity based on operational conditions while maintaining overall structural stability.
Solution Approach 2:
The patent utilizes vibration during device operation to create periodic changes in the gap between the cover and enclosure. This periodic movement enhances airflow through the gaps, improving cooling efficiency by creating pulsating air flow that increases heat dissipation from the enclosure surface.
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 airflow passage effectively cools the enclosure by adjusting airflow volume through vibration, preventing excessive temperature rise and avoiding grease leakage.
Implementation Method 1
cooling air, which is sucked into a main body by a fan for cooling a motor, flows between a case and a cover, thereby cooling the case
Implementation Method 2
a cover added outside the enclosure portion is used and the enclosure portion is cooled by utilizing vibration of the working device during an operation
Data Source
AI summary
In a working device, a cover added outside an enclosure portion is used to utilize vibration of the working device during an operation thereof to cool the enclosure portion. The working device has: a motor; a speed reduction mechanism for decelerating rotation of the motor; a striking mechanism; an enclosure portion (main body housing, hammer case 5) accommodating them; and a cover covering at least a portion of an outer surface of the enclosure portion. An airflow passage is formed between an outer surface of the hammer case and the cover and is configured so as to allow inflow and outflow of outside air. The cover is held so as to be slightly movable by sandwiching an elastic member in an axial line direction and, by the cover being moving forward and backward during its operation, air goes into or comes out of the airflow passage to cool the hammer case.