Impact Tool Dust Fan Layout for Compact Motor Housing
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Solution Overview
Problem
Conventional impact tools with dust collection systems face compactness issues due to the placement of dust collection fans, which necessitate larger motor housings, compromising their downsizing potential.
Innovation Solution
The dust collection fan is positioned below the motor, allowing the motor housing to maintain its compact size without enlargement, even when a motor cooling fan is included, and the air inlet and exhaust outlets are strategically located on the lower surface to minimize dust entry and maximize airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dust collection fan is disposed on the upper portion of the motor shaft, then the dust collection function is achieved, but the motor housing becomes large in radial direction and compactability is impaired
Solution Approach 1:
The dust collection fan is repositioned from the radial direction (upper portion of motor shaft) to the axial direction (below the motor). This dimensional change in fan placement allows the motor housing to maintain its compact radial size while still accommodating the dust collection fan, thus resolving the contradiction between dust collection functionality and motor housing compactness
2Object-affected harmful factors
If the air inlet is disposed on the lower surface, then dust entry is reduced, but airflow area may be limited
Solution Approach 1:
The air inlet is positioned asymmetrically on the lower surface of the motor housing rather than on conventional sides. This asymmetric placement, combined with the dust collection fan's axial positioning below the motor, creates an optimized airflow path that minimizes dust entry while maintaining adequate airflow area through strategic geometric 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 enables the impact tool to remain compact while effectively collecting dust, ensuring a wide opening area for air flow and reducing the likelihood of dust entry, thus maintaining downsizing and improving the tool's appearance and performance.
Implementation Method 1
rotation of the dust collection fan by a drive of a motor causes air suctioned from a suction opening disposed at a tool end to pass through a dust box inside the dust collector
Implementation Method 2
The dust collection attachment generates a suctioning force to the suction opening by rotation of the dust collection fan
Data Source
AI summary
An impact tool includes a housing, an impact mechanism unit, a motor, and a dust collection fan. The housing is configured to mount a dust collection attachment. The impact mechanism unit is disposed inside the housing. The impact mechanism unit has a front end to which a tool bit is mounted and an impact element that reciprocates. The impact mechanism unit is configured to impact the tool bit by the impact element. The motor is disposed such that a rotation shaft of the motor intersects with an impact axis direction of the impact mechanism unit inside the housing. The dust collection fan is disposed on the rotation shaft. The dust collection fan is disposed below the motor.