Power Tool Gearbox Control for Smooth State Transitions
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Solution Overview
Problem
Existing power tools face challenges in switching between operating states without damaging components, particularly when changing gears or modes, as they often require significant operating forces and can lead to gearbox blockage or increased wear.
Innovation Solution
The power tool adjusts the output of the drive motor by activating an auxiliary device, reducing the load on gearbox components during state changes, allowing for smooth transitions between gears or modes without causing damage, and enabling automatic switching between operating modes using a common operating element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If gear shifting is performed during operation without reducing drive motor output, then gear changing can be achieved, but high operating forces cause component damage and gearbox blockage
Solution Approach 1:
The control unit reduces the output of the drive motor before gear shifting occurs. This preliminary reduction of motor output prevents excessive operating forces from damaging gearbox components during the gear shifting process, thereby resolving the contradiction between ease of operation and reliability.
2Productivity
If gear shifting is performed without reducing drive motor output, then gear changing is possible, but wear on gearbox components increases
Solution Approach 1:
The control unit temporarily reduces drive motor output before gear shifting to minimize wear on gearbox components. After the gear shift is complete, the motor output is restored to its previous level, allowing continuous operation while extending component service life through protective pre-action.
3Reliability
If drive motor output is reduced during gear shifting, then component damage is prevented, but operating time during transition increases
Solution Approach 1:
The control unit applies a partial reduction of drive motor output specifically during the gear shifting transition period, rather than a complete shutdown. This partial action provides sufficient protection to prevent component damage while minimizing the loss of operating time during the transition.
Data Source
AI summary
A power tool includes a drive motor and at least one auxiliary device, which is coupled to the drive motor, for activating at least two different operating states. The drive motor and the at least one auxiliary device are controllable using at least one operating device. The output of the drive motor is changed when the at least one auxiliary device is activated. As a result, the operating forces are reduced when switching between operating states, and the load on components is reduced.