Handle-Mounted Power Tool Motor Relocation for Ergonomic Cooling
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Solution Overview
Problem
Conventional hand-held power tools, such as grinding and polishing machines, suffer from ergonomic issues due to the heat generated by the drive motor located in the handle, leading to discomfort during operation.
Innovation Solution
The motor axis and drive axis are positioned from top to bottom within the machine housing, with the drive motor separated from the handle, allowing for effective cooling and improved ergonomics through a transmission belt system and a design that balances weight between the motor and gear components, enabling efficient pressure application on the tool and optimal cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the drive motor is located in the handle, then the tool is compact and easy to hold, but the handle heats up causing ergonomic discomfort
Solution Approach 1:
The drive motor is extracted from the handle and relocated to a separate motor housing positioned away from the user's hand. This separation removes the heat source from the handle area, preventing thermal discomfort while maintaining operational control through the transmission belt system.
Solution Approach 2:
The tool is segmented into distinct functional zones: the handle for user control, the motor housing for power generation, and the tool holder for tool mounting. This spatial segmentation allows each component to be optimized independently, with the handle remaining cool to the touch while the motor operates in a separate thermal zone.
2Ease of operation
If the drive motor is positioned away from the handle, then heat-related discomfort is reduced, but the device complexity increases due to transmission components
Solution Approach 1:
A transmission belt acts as an intermediary mechanism connecting the drive motor to the tool holder. This flexible power transmission element allows the motor to be positioned remotely while maintaining a simple and reliable connection, avoiding the need for complex rigid linkages or multiple intermediate components.
3Force
If the motor axis and drive axis run from top to bottom, then pressure application on the tool is improved, but the weight distribution must be carefully balanced
Solution Approach 1:
The motor axis and drive axis are oriented vertically from top to bottom, perpendicular to the workpiece surface, rather than horizontally. This dimensional reorientation allows the user to apply downward pressure through the handle more effectively, utilizing gravity and hand strength to press the tool against the workpiece for optimal grinding or polishing contact.
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 enhances ergonomics, reduces heat-related discomfort, and maintains a balanced weight distribution, ensuring efficient operation and improved user experience by keeping the motor away from the handle and allowing for effective cooling of all components.
Implementation Method 1
a transmission element, in particular in the form of a drive belt, is described
Implementation Method 2
a fan wheel, driven by the drive motor, is positioned between an outlet opening for air flowing out of the machine housing and the connecting section or handle
Data Source
Figure 1~2
Figure 3~7b
Figure 8~10b
AI summary
The power tool (10) has a drive motor (17) for driving a tool retainer that retains tools (24) e.g. grinding disk and polishing disk, where the tool retainer and a drive part (33) are arranged in a tool area (12) of a power tool housing (11). The drive motor is arranged in a motor area (13) of the housing. The tool area and the motor area are arranged at opposite end areas of a handle (14) at a distance to each other with respect to a longitudinal axis (28) of the housing. A motor axis (40) and/or a drive axis (36) run from an upper side (22) to a lower side (21) of the housing.