Auto-Shift Power Tool Transmission for Variable Torque Loads
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Solution Overview
Problem
Existing power tools lack an efficient mechanism to automatically adjust between high-speed, low-torque and low-speed, high-torque operations, leading to user fatigue and reduced operational efficiency.
Innovation Solution
A power tool with an auto-shift mechanism that transitions between torque transmission paths based on torque levels, using a clutch system and gear sets to switch between high-speed, low-torque and low-speed, high-torque modes, and includes a torque transducer for real-time torque monitoring and display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a power tool operates in a single fixed gear mode, then the structure remains simple, but the tool cannot adapt to varying torque demands leading to user fatigue and reduced efficiency
Solution Approach 1:
The patent implements a dynamic gear shifting mechanism that automatically transitions between high-speed/low-torque and low-speed/high-torque gear sets based on real-time torque sensor feedback. This allows the power tool to adapt its transmission ratio dynamically, optimizing performance across varying operational conditions without requiring manual intervention from the user.
Solution Approach 2:
The auto-shift mechanism incorporates a torque sensor and control system that autonomously monitors torque output and automatically selects the appropriate gear set. This self-service capability eliminates the need for user judgment and manual gear changing, allowing the system to optimize its own performance based on actual workload conditions.
2Productivity
If manual gear shifting is required to optimize torque output, then torque control can be optimized, but user fatigue increases and operational efficiency decreases
Solution Approach 1:
The system employs an automatic gear shifting mechanism with torque sensing capability that eliminates the need for user intervention. The torque sensor continuously monitors the tool's output torque and automatically commands the appropriate gear set engagement, allowing the power tool to optimize its torque delivery without requiring the user to manually shift gears or judge workload conditions.
Solution Approach 2:
The patent incorporates a torque sensor that provides real-time feedback on the tool's torque output to the control system. This feedback loop enables the control system to automatically determine when to shift between gear sets, ensuring optimal torque delivery is maintained across varying operational conditions without user input.
3Adaptability or versatility
If the power tool uses a single transmission path, then the device complexity is reduced, but the tool cannot provide both high-speed and high-torque operations
Solution Approach 1:
The patent divides the transmission system into two distinct gear sets: a high-speed/low-torque gear set and a low-speed/high-torque gear set. Each gear set is optimized for specific operational requirements, allowing the power tool to deliver either high speed or high torque based on the application demands. The segmentation is managed through an automatic shifting mechanism that selects the appropriate gear set based on torque sensor feedback.
Solution Approach 2:
The dual gear set transmission system provides multi-functionality, enabling the power tool to perform both high-speed drilling/drivening operations and high-torque fastening operations. The automatic gear shifting mechanism ensures the appropriate gear set is engaged for each task type, making the single power tool capable of handling diverse applications that previously would have required separate specialized tools.
Data Source
AI summary
A power tool including a housing, a motor having an output shaft, a first gear set coupled to the output shaft, a second gear set, and an auto-shift mechanism. The motor is configured to drive rotation of the output shaft to generate torque. The auto-shift mechanism is positioned between the first gear stage and the second gear stage and provides at least a first torque transmission path and a second torque transmission path between the first gear set and the second gear set. The auto-shift mechanism is configured to transmit torque between the first gear set and the second gear set along the first path when torque generated by the motor is less than a critical torque and is configured to transmit torque between the first gear set and the second gear set when torque generated by the motor is greater than the critical torque.