Battery Tray Air Guide With Accessible Filter for Motor Cooling
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Solution Overview
Problem
Existing hand-guided, battery-operated working apparatuses face challenges in effectively cooling both the battery pack and drive motor, with limitations in air guidance and filter accessibility, leading to potential damage from external influences and inefficiencies in cooling air distribution.
Innovation Solution
The apparatus incorporates a filter element accessible via the battery tray, allowing for easy cleaning and protection, with a cooling air guide design that directs air around the battery pack, ensuring efficient cooling without passing air through it, and a sealed housing to prevent extraneous air entry, along with a fan positioned downstream of the drive motor for enhanced air flow management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling air is directed through the battery pack for cooling, then battery pack cooling is improved, but the battery pack becomes exposed to extraneous air and potential damage
Solution Approach 1:
A filter element is introduced as an intermediary component in the cooling air path. The filter element is arranged in the cooling air guide between the housing inlet and the battery pack, allowing cooling air to pass through while filtering out extraneous particles and contaminants, thus protecting the battery pack while maintaining cooling effectiveness
Solution Approach 2:
The harmful aspect (extraneous air and contaminants) is extracted from the cooling air stream by using a filter element. The filter separates the useful cooling function from the harmful contamination, allowing clean filtered air to cool the battery pack while blocking harmful particles
2Object-affected harmful factors
If the filter element is placed in the cooling air guide, then air filtration is improved, but the filter element becomes inaccessible for maintenance
Solution Approach 1:
The battery pack serves as a dynamic element that, when removed, automatically provides access to the filter element. The system transitions from a closed state (battery pack installed, filter hidden) to an open state (battery pack removed, filter accessible), enabling easy maintenance without requiring separate access mechanisms
Solution Approach 2:
The battery pack removal operation serves dual purposes: it both provides access for filter maintenance and allows battery replacement. This multi-functional approach means that a single user action (removing the battery pack) accomplishes both tasks, improving ease of operation without adding complexity
3Temperature
If cooling air is guided through the drive motor, then motor cooling is improved, but the cooling air path becomes complex
Solution Approach 1:
The cooling air paths for the battery pack and drive motor are merged into a single integrated cooling air guide structure. A single housing inlet supplies cooling air that branches to serve both components, and a single housing outlet collects exhaust from both. This unified approach simplifies the overall structure while maintaining effective cooling of both the battery pack and drive motor
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 ensures effective cooling of both the battery pack and drive motor, maintains filter element accessibility for maintenance, and prevents re-circulation of heated air, enhancing operational efficiency and durability while maintaining a clean air intake.
Implementation Method 1
a cooling air guide (5) in the apparatus housing (1), which has an inlet-side air guide portion (6), extending from a housing inlet (7) into the battery tray (3) as far as an air outlet (19) from the battery tray, and an outlet-side air guide portion (9), leading from the air outlet (19) of the battery tray to the drive motor (2) and, from there, onwards to a housing outlet (8)
Implementation Method 2
a filter element (10), which is arranged in the cooling air guide (5) in such a way as to be accessible via the battery tray (3)
Data Source
AI summary
A hand-guided, battery-operated working apparatus has an apparatus housing in which is arranged an electric drive motor, a battery tray to accommodate a removable battery pack, and a cooling air guide. The cooling air guide includes an inlet-side air guide portion, which extends from a housing inlet into the battery tray as far as an air outlet from the battery tray, and an outlet-side air guide portion, which leads from the air outlet of the battery tray to the drive motor and, from there, onwards to a housing outlet. The working apparatus has a filter element, which is arranged in the cooling air guide so as to be accessible via the battery tray.