Hand-Held Power Tool Housing Cover With Filtered Air Inlets
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Solution Overview
Problem
Existing hand-held power tools lack an effective cooling system, leading to reduced performance and efficiency due to inadequate air supply and dust penetration, which affects the carbon brushes and internal components.
Innovation Solution
A hand-held power tool design featuring a housing cover with air inlet openings and filter elements that prevent dust and material particles from entering, ensuring efficient cooling air supply to the electric motor, with a detachable filter system for maintenance and protection of internal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the housing cover is made detachable to allow access to carbon brushes and electronics, then ease of maintenance is improved, but protection of internal components from dust and debris deteriorates
Solution Approach 1:
The housing cover is divided into a main cover portion and a dust cap portion that can be separately removed. The dust cap can be taken off independently to access carbon brushes, while the main cover remains attached to maintain dust protection. This segmentation allows selective access to different components without compromising overall protection.
2Temperature
If air inlet openings are added to the housing cover for motor cooling, then cooling efficiency is improved, but dust penetration into the housing increases
Solution Approach 1:
Filter elements are introduced as intermediary components positioned between the air inlet openings and the housing interior. These filters allow cooling air to pass through to the motor while blocking dust and material particles from entering the housing. The filter acts as a mediator that permits beneficial airflow while preventing harmful contamination.
3Object-affected harmful factors
If filter elements are integrated into the housing cover, then dust protection is improved, but ease of filter maintenance deteriorates
Solution Approach 1:
The filter system is segmented into removable filter elements that can be independently accessed and replaced. The dust cap portion can be removed to provide access to the filter elements, allowing users to clean or replace filters without disassembling the entire housing cover. This segmentation maintains dust protection while enabling easy filter maintenance.
4Shape
If the housing cover closes flush with the housing, then aesthetic appearance and sealing are improved, but air inlet opening design becomes more complex
Solution Approach 1:
The air inlet openings are designed in the dust cap portion rather than the main housing cover. This allows the main cover to maintain a simple flush closure design, while the dust cap provides the necessary airflow paths in a separate, easily accessible location. The airflow function is moved to another dimension (the removable dust cap) to simplify the main cover design.
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 provides improved cooling efficiency and extended tool life by maintaining a clean air flow to the motor, reducing wear on carbon brushes and ensuring consistent performance.
Implementation Method 1
at least one filter element is arranged at the air inlet opening, which is designed to prevent material particles and dust from penetrating into the housing of the hand-held power tool
Implementation Method 2
The housing cover has at least one air inlet opening, which is designed to supply the electric motor with cooling air
Data Source
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AI summary
The invention relates to a hand-held power tool comprising an electric motor and a housing, the housing being provided with an opening located in the vicinity of the carbon brushes such that the carbon brushes can be removed through the opening in the housing. The opening in the housing is detachably closed by a housing cover that includes air inlets through which cooling air can flow into the interior of the housing.