Impact Tool Dust Fan Layout for Compact Motor Housing
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Solution Overview
Problem
Existing impact tools, such as hammer drills, face challenges in maintaining compactness when equipped with a dust collection fan, as the motor housing needs to be enlarged to accommodate the fan's outer diameter.
Innovation Solution
The impact tool is designed with the dust collection fan positioned below the motor, allowing the motor housing to remain compact without the need for enlargement, and includes a configuration where the dust collection fan is adjacent to a motor cooling fan on a shared rotation shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the dust collection fan is mounted on the motor shaft extending in the up-down direction, then the dust collection function is achieved, but the motor housing becomes large in the radial direction
Solution Approach 1:
The dust collection fan is repositioned from a radial mounting configuration to an axial mounting configuration below the motor. This dimensional change in the fan's placement allows the motor housing to maintain its compact radial dimensions while still accommodating the dust collection fan through the available axial space, thus resolving the contradiction between achieving dust collection functionality and maintaining compact motor housing size.
2Device complexity
If the dust collection fan is disposed on the rotation shaft, then the dust collection function is integrated with the motor, but the housing size increases
Solution Approach 1:
The dust collection fan is integrated with the motor by mounting it on the motor's rotation shaft, combining two functions (motor operation and dust collection) into a single unified structure. This merging allows the dust collection fan to be driven directly by the motor without requiring a separate drive mechanism, achieving functional integration while controlling overall size through efficient space utilization.
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 maintain downsizing even with the inclusion of a dust collection fan, while also ensuring effective airflow and preventing foreign matter from entering the air inlet and exhaust outlets.
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
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.