Power Tool Torque Sensing Layout Isolated From Rotation Vibration
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Solution Overview
Problem
Existing power tools with torque sensors installed on the transmission mechanism face issues such as broken wires, contact failures, and reduced accuracy due to vibration and deformation of the transmission mechanism during operation.
Innovation Solution
The torque sensing arrangement involves disposing the torque post and torque sensor in the handle of the power tool housing, perpendicular to the power body, thereby avoiding rotation with the power device and minimizing the impact of vibrations on torque detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the torque sensor is installed on the transmission mechanism, then the torque detection function is achieved, but the sensor rotates with the power device causing broken wires and contact failures
Solution Approach 1:
The torque sensor is extracted from the rotating transmission mechanism and relocated to the stationary handle body. The torque post transmits torque information from the rotating power body to the stationary torque sensor, separating the sensing function from the rotating components to eliminate wire breaking and contact failures.
Solution Approach 2:
The torque post serves as an intermediary component that transmits torque information from the rotating power body to the stationary torque sensor. This mediator allows the sensor to remain stationary while still detecting torque from the rotating mechanism, solving the electrical connection reliability issue.
2Measurement precision
If the torque sensor is installed on the transmission mechanism, then the torque detection function is achieved, but the vibration and deformation of the transmission mechanism reduce measurement accuracy
Solution Approach 1:
The torque sensor is extracted from the vibrating transmission mechanism and placed in the stationary handle body, removing it from the harmful vibration and deformation environment. The torque post transmits the torque signal without being affected by these harmful factors.
Solution Approach 2:
The torque detection system is relocated from the horizontal transmission mechanism dimension to the vertical handle body dimension. The torque post is arranged perpendicular to the power body, placing the sensor in a different spatial dimension where vibration and deformation interference is minimized.
3Reliability
If the torque sensor rotates with the power device, then the torque can be detected, but broken wires and contact failures occur
Solution Approach 1:
The torque sensor is extracted from the rotating system and fixed in the stationary handle body. This extraction eliminates the rotation-induced wire breaking and contact failures, enabling long-term stable operation without electrical connection issues.
Solution Approach 2:
The torque post acts as a mediator that transfers torque information from the rotating power body to the stationary sensor, allowing the sensor to remain stationary during extended operation and avoiding the electrical connection problems that would occur with continuous rotation.
Data Source
AI summary
A power tool includes a housing (10), a power device (20), a bearing set (30), a torque post (40) and a torque sensor (50). The housing (10) includes a main body (11) and a handle (12) perpendicularly connected to one side of the main body (11). The power device (20) is disposed in the main body (11) and includes a power body (21) and a bushing (22) adapted to sheathe the power body (21). The bearing set (30) is arranged between the bushing (22) and the housing (10). The power body (21) may rotate relative to the housing (10). The torque post (40) is disposed in the handle (12) and abuts against the bushing (22). The torque post (40) is arranged perpendicularly to the power body (21). The torque sensor (50) is disposed on the torque post (40).