Cycloidal Transmission Torque Sensing to Reduce Measurement Error
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Solution Overview
Problem
Existing cycloidal transmissions face imprecision in torque measurement due to external influences and frictional effects, which affects the control of robot and machine tool movements, leading to potential wear or damage.
Innovation Solution
A cycloidal transmission with a torque detection means integrated between the bearings of the drive and output shaft, utilizing strain gauges and a measuring flange to measure torque precisely within the transmission, reducing external interference and frictional errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If torque is measured by force transducers or motor current, then torque detection is achieved, but measurement precision deteriorates due to external forces and frictional effects
Solution Approach 1:
The torque detection mechanism is extracted from the external measurement approach and integrated directly into the cycloidal transmission between the drive shaft and output shaft. This removes the measurement function from the external environment where it is subject to friction and external forces, placing it instead in the protected internal space of the transmission where torque can be measured directly at the source without interference.
2Measurement precision
If torque detection means is integrated within the transmission, then measurement precision improves, but device complexity increases
Solution Approach 1:
The torque detection mechanism is merged with the existing cycloidal transmission structure. The detection means is integrated between the drive shaft and output shaft, utilizing the existing mechanical components and spaces within the transmission. This combining approach allows torque measurement functionality to be added without creating a completely separate external measurement system, thereby improving precision while limiting the increase in overall device complexity.
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 solution enables accurate torque measurement and control, enhancing machine safety and reducing wear by decoupling unwanted forces and torques, while minimizing installation space and costs.
Implementation Method 1
utilizing strain gauges and a measuring flange to measure torque precisely within the transmission
Data Source
AI summary
A cycloidal transmission for a drive includes a housing, a drive shaft, an eccentric, a cam plate, a pin plate, an output shaft, and a torque detection mechanism. The housing includes a first bearing, a second bearing, and a rolling ring. The drive shaft is rotatably mounted in the first bearing. The eccentric is fixedly connected to the drive shaft. The cam plate is driven by the eccentric. The cam plate is configured to roll in the rolling ring. Pins of the pin plate are configured to engage holes of the cam plate, so that the pin plate is driven by the cam plate. The output shaft is fixedly connected to the pin plate. The output shaft is rotatably mounted in the second bearing. The torque detection mechanism is between the first bearing and the second bearing and configured to detect the torque of the output shaft.