Dust-Protected Hand-Held Power Tool Filter Design
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Solution Overview
Problem
Hand-held power tools, especially those used for metalworking, face the challenge of magnetizable dust penetrating through cooling air flows and adhering to permanent magnets, causing damage due to magnetic adhesion, which is difficult to remove.
Innovation Solution
A filter element, such as a paper filter, is positioned at the air inlet openings, retained by a filter retaining part that can be elastically deformed and snapped onto the housing base, ensuring dust, including magnetizable dust, is kept away from electromotive drive components while allowing for effective cooling and easy replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air inlet openings are provided for cooling the electromotive drive components, then cooling effectiveness is improved, but magnetizable dust penetrates into the interior and deposits on the permanent magnets
Solution Approach 1:
A filter element is introduced as an intermediary component between the air inlet openings and the electromotive drive components. The filter element captures magnetizable dust particles from the cooling air flow before they can reach and deposit on the permanent magnets, while still allowing adequate cooling air flow to pass through to the drive components.
Solution Approach 2:
The filter element is positioned specifically at the air inlet openings where dust enters the housing base. This localized filtration approach addresses the dust penetration problem at its source while maintaining cooling effectiveness throughout the interior of the power tool.
2Object-affected harmful factors
If a filter element is provided to retain dust, then dust protection is improved, but the device complexity increases
Solution Approach 1:
The filter element is implemented as a thin, flexible filter mat that can be easily inserted and removed from the filter retaining part. This simple, film-like structure provides effective dust filtration without adding significant complexity to the overall device design.
Solution Approach 2:
The dust protection function is segmented into a separate, removable filter element that can be independently maintained and replaced. The filter retaining part provides a dedicated housing for the filter element, allowing it to be serviced separately from the main power tool assembly.
3Ease of operation
If the filter element is positioned on the exterior of the housing base, then ease of cleaning and replacement is improved, but sealing toward the interior becomes more difficult
Solution Approach 1:
The filter retaining part acts as an intermediary structure that bridges the exterior and interior of the housing base. It provides a mounting interface on the exterior for easy filter element access while creating a sealed barrier that prevents dust-laden air from entering the interior without passing through the filter element.
4Ease of operation
If the filter retaining part is pivotably attached, then ease of operation is improved, but the device complexity increases
Solution Approach 1:
The filter retaining part is designed with pivotable attachment to the housing base, allowing it to swing between a closed position (when filtering) and an open position (for filter element replacement). This dynamic capability improves operability while maintaining a relatively simple structural design through the use of a basic pivot mechanism.
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 solution effectively prevents magnetizable dust from reaching the electromotive components, reducing damage and ensuring efficient cooling, with the filter being easy to clean and replace, thus enhancing the tool's operational reliability and longevity.
Implementation Method 1
a filter element is provided in the area of the air inlet openings by means of which dust, especially magnetizable dust, can be kept away from the electromotive drive components
Implementation Method 2
air inlet openings supplying the electromotive drive components with a cooling air flow
Implementation Method 3
the electromotive drive components comprise permanent magnets
Data Source
AI summary
A battery-operated hand-held power tool (2), especially an angle grinder, comprises a housing base (4) accommodating the electromotive drive components and air inlet openings (10) supplying the electromotive drive components with a cooling air flow. In order to protect the electromotive components from dirt, the hand-held power tool is designed in such a manner that a filter element (20) is provided in the area of the air inlet openings (10) and keeps dust, especially magnetizable dust, away from the electromotive drive components. The filter element (20) is retained by a filter retaining part (12, 30) which can be attached to the exterior of the housing base (4). The filter retaining part (14, 30) can be elastically deformed to such an extent that it is slightly deformed, especially expanded, when attached to the housing base, and engages behind or snaps into an element on the housing base.