RV Reducer Fatigue Testing Device with Simultaneous Torque and Bending Load
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Solution Overview
Problem
Current fatigue life testing devices for RV reducers in industrial robots cannot simultaneously apply loaded torque and bending moment, limiting the ability to study the precision retaining ability and fatigue life under real operating conditions.
Innovation Solution
A testing device that includes a workbench, mounting bracket, servo motor, counterweight blocks, displacement sensors, and a simulated swing arm to apply both loaded torque and bending moment simultaneously, allowing for real-time measurement of positioning accuracy, bending stiffness, and wear analysis of RV reducers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing loading method is used, then simple testing is possible, but cannot simultaneously provide loaded torque and loaded bending moment
Solution Approach 1:
The loading system is divided into two independent parts: a torque loading mechanism and a bending moment loading mechanism. The torque is applied through the input shaft while the bending moment is applied through the output shaft, allowing both loads to be applied simultaneously without interfering with each other. This segmentation enables comprehensive fatigue life testing under real operating conditions.
Solution Approach 2:
A specialized mounting bracket and support structure serve as intermediaries to transmit and apply the bending moment load to the RV reducer output shaft. The mounting bracket base and upper pressure plate create a mechanical linkage that converts actuator motion into bending moment application, enabling simultaneous torque and bending moment loading.
2Reliability
If normal working conditions are used for testing, then realistic data is obtained, but test time is excessively long (6000 hours)
Solution Approach 1:
The testing device enables accelerated life testing by changing the operating parameters - specifically increasing the speed and loaded conditions beyond normal working conditions. The simultaneous application of torque and bending moment, along with increased rotational speed, accelerates wear and fatigue mechanisms while maintaining representative failure modes, thus obtaining reliable data in compressed timeframes.
Solution Approach 2:
The testing system applies periodic cyclic loading through the servo actuators, creating repeated stress cycles that simulate real operating conditions. The periodic rotation and loading cycles accelerate fatigue accumulation, allowing fatigue life assessment in reduced test durations while preserving the fundamental failure mechanisms.
3Measurement precision
If positioning accuracy measurement is added, then precision retaining ability is evaluated, but measurement system complexity increases
Solution Approach 1:
The positioning accuracy measurement system replaces complex mechanical measurement mechanisms with optical or electromagnetic sensors. Displacement sensors and encoders measure the rotational position and positioning accuracy of the output shaft without requiring mechanical contact or complex mechanical linkages, thus achieving precise measurement while minimizing added system complexity.
Data Source
AI summary
The invention relates to a device for testing the precision retaining ability and fatigue life of RV reducer. The device includes a workbench, a mounting bracket base, a upper pressure plate for the mounting bracket, a servo motor, a mounting fixed sleeve, a tested RV reducer, a temperature sensor, an extension arm, a simulated swing arm, two counterweight blocks named the first and second counterweight block, the first displacement sensor, a sensor holder, a sensor protector, a detection rod, and the second displacement sensor. The device is equipped with two counterweight blocks at the end of the simulated swing arm to simultaneously provide variable loaded torque and loaded bending moment to the RV reducer. The first displacement sensor is placed under the counterweight block to measure the positioning accuracy and repeat positioning accuracy of RV reducer. The second displacement sensor is placed under the detection rod to measure the bending stiffness of RV reducer. After running for a specified time, the precision retaining ability, fatigue life and wear rule of RV reducer are tested. The invention provides an experimental basis for theoretical research on the wear rule and accelerated life of RV reducer.