Torque Sensor Mounting on Inner Casing Socket
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power tool torque sensors are prone to wire breakage and poor contact due to their rotating state, leading to inaccurate torque detection and potential damage, especially when installed on transmission mechanisms that experience vibration or deformation.
Innovation Solution
A torque sensing device is installed on an inner casing socket, isolated from direct power body vibration, with the torque sensor mounted on the inner casing socket and transmitting force through a jacket and inner casing socket, avoiding direct fixation on power-transmitting components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the torque sensor is installed on the transmission mechanism that rotates with the power body, then the torque sensor can detect the torque value, but the wire may breakage and contact may become poor due to continuous rotation and vibration
Solution Approach 1:
The patent introduces an inner casing socket as an intermediary component between the power body and the torque sensor. The torque sensor is installed on the inner casing socket rather than directly on the rotating transmission mechanism. The inner casing socket transmits torque from the power body to the torque sensor through bearing sets, allowing the sensor to detect torque without being directly attached to rotating parts, thus preventing wire breakage and contact issues.
2Ease of manufacture
If the torque sensor is directly fixed onto the power body, then the installation is simple, but the torque sensor is affected by vibration and cannot provide accurate torque values
Solution Approach 1:
The inner casing socket serves as a mediator that isolates the torque sensor from direct vibration of the power body. The bearing sets between the jacket and inner casing socket, and between the inner casing socket and outer casing, provide a stable mounting platform that reduces vibration transmission while maintaining torque transmission capability.
3Measurement precision
If the torque sensor is installed on the inner casing socket isolated from power body vibration, then accurate torque detection is achieved, but the device structure becomes more complex
Solution Approach 1:
The inner casing socket performs multiple functions: it serves as a mounting platform for the torque sensor, transmits torque from the power body through bearing sets, and isolates the sensor from vibration. The bearing sets also serve dual purposes of supporting the inner casing socket and transmitting rotational motion. This multi-functionality reduces the need for additional separate components.
Data Source
Figure 1
Figure 2
Figure 3
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.