Power Tool Torque Sensor Mounting for Vibration Isolation
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Solution Overview
Problem
Existing torque sensors in power tools are prone to wire breakage and poor contact due to direct exposure to the rotating transmission mechanism, leading to inaccurate torque detection and potential damage.
Innovation Solution
The torque sensor is installed on an inner casing socket, avoiding direct contact with the power body and using a bearing set to transmit torque through a jacket and inner casing socket, ensuring accurate torque measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the torque sensor is installed directly on the transmission mechanism, then the torque detection is straightforward, but the sensor is exposed to vibration and rotation causing wire breakage and poor contact
Solution Approach 1:
The patent introduces an intermediary structure (the inner casing socket and bearing set) between the torque sensor and the transmission mechanism. The torque sensor is installed on the inner casing socket rather than directly on the rotating transmission mechanism. The bearing set acts as a mediator to transmit torque from the power body through the jacket to the inner casing socket, where the torque sensor detects the torque. This intermediary structure isolates the sensor from direct exposure to vibration and rotation while maintaining torque transmission capability.
2Measurement precision
If the torque sensor is installed on the rotating transmission mechanism, then torque detection is direct, but the sensor experiences continuous rotation causing wire breakage and poor contact
Solution Approach 1:
The bearing set serves as a mediator that transmits torque from the rotating power body to the stationary inner casing socket. The torque sensor is installed on the inner casing socket, which does not rotate with the transmission mechanism. This intermediary arrangement allows the sensor to detect torque accurately without being directly exposed to the harmful effects of continuous rotation and vibration.
Solution Approach 2:
The patent segments the torque transmission path into distinct components: the power body, the jacket, the inner casing socket, and the torque sensor. By separating the sensor from the rotating transmission mechanism and placing it on the stationary inner casing socket, the system maintains torque detection capability while eliminating the harmful effects of continuous rotation on the sensor.
3Reliability
If the torque sensor is installed on the inner casing socket, then the sensor is protected from vibration, but the structure becomes more complex with additional components
Solution Approach 1:
The inner casing socket serves multiple functions: it provides a stationary mounting base for the torque sensor, transmits torque from the power body through the bearing set, and structurally connects the jacket to the outer casing. The bearing set also serves dual purposes by supporting the rotating power body and transmitting torque to the inner casing socket. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in structural complexity while achieving sensor protection from vibration.
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 prevents sensor vibration, maintains accurate torque detection, and reduces the risk of damage, enhancing the tool's practicality and ease of assembly.
Implementation Method 1
The bearing set includes a front bearing and a rear bearing, and the front bearing is installed between the jacket and the inner casing socket, and the rear bearing is installed between the inner casing socket and the outer casing
Data Source
AI summary
A torque sensing device of a power tool (1) includes an outer casing (10), a power structure (20), a jacket (30), an inner casing socket (40), a bearing set (50) and a torque sensor (10). The power structure (20) is installed in the outer casing (10) and includes a power body (21) with a drive shaft (211). The jacket (30) sheathes the power body (21). The bearing set (50) includes a front bearing (51) installed between the jacket (30) and the inner casing socket (40), and a rear bearing (51) installed between the inner casing socket (40) and the outer casing (10). The torque sensor (10) is installed on the inner casing socket (40) to provide an accurate torque value.