A calculation method of transmission efficiency for RV reducer

Abstract

RV reducer is the core component of industrial robot. It is of great significance to raise the transmission efficiency of RV reducer for improving the transmission performance of industrial robot. RV reducer belongs to the 2K-V type planetary gear train and consists of an equal speed ratio mechanism. Therefore, according to the structural characteristics of RV reducer, the virtual power theory and split power theory are adopted, and a calculation method of transmission efficiency for RV reducer is proposed. Firstly, the structure of a common RV reducer is introduced. Related structural analysis, kinematic analysis, and loaded analysis are given. Secondly, RV reducer is represented by the method of graph theory. By the virtual power theory and split power theory, the power flow direction is determined, and the values of split powers are calculated. Finally, according to the graph representation for RV reducer and the calculation principle of meshing power loss of planetary gear, the power losses of meshing gear pairs are calculated, respectively. According to the input and output values described in graph representation of RV reducer, the formula of transmission efficiency for RV reducer is derived. The calculation of transmission efficiency for RV-40E reducer is considered as an example. The result is compared with previous work on the subject, and the relations between design parameters and transmission efficiency of RV reducer are discussed.

Fault Diagnosis for Reducers Based on a Digital Twin

“…Regarding Autoencoders, they also demand extensive unlabeled data for effective training [ 23 ]. Furthermore, the overfitting caused by noise or outliers in the training data might comprise the generalization capability of the model, leading to potential false alarms or missed detections [ 24 ].…”

Analysis and experimental study on vibration characteristics of the RV reducer

“…Scholars have done a lot of research on RV reducers, the most important research contents are as follows: the tooth profile modification optimization of the cycloidal gear of the reducer, 14–17 the finite element analysis of the dynamic performance, 18–20 and the development of the new type structural reducer. 21–23 Li et al 24 proposed a meshing contact analysis approach for RV cycloidal-pin gear transmission using the RV cycloidal-pin gear pair transmission as an example.…”

“…It is necessary to systematically study its transmission structure, vibration characteristics, and process optimization design, and carry out vibration tests, providing important guidance and practical value for engineering applications. [10][11][12][13] Scholars have done a lot of research on RV reducers, the most important research contents are as follows: the tooth profile modification optimization of the cycloidal gear of the reducer, [14][15][16][17] the finite element analysis of the dynamic performance, [18][19][20] and the development of the new type structural reducer. [21][22][23] Li et al 24 proposed a meshing contact analysis approach for RV cycloidal-pin gear transmission using the RV cycloidal-pin gear pair transmission as an example.…”

Digital twin‐assisted fault diagnosis system for robot joints with insufficient data

“…However, it is easily damaged under long‐term work and overload operation conditions. At present, there have been a multitude of scholars pouring attention into transmission efficiency (Wang, 2021), optimization of design (Yang et al, 2021) and error analysis of RV reducers (Li et al, 2018), but little into the fault diagnosis aspect. The existing fault diagnosis of RV reducers is mostly based on deep learning (Chen et al, 2021; Long et al, 2021; Peng & Wang, 2019).…”