Analysis of a cycloid speed reducer
TL;DR: In this article, a procedure to calculate the forces on various elements of the speed reducer as well as the theoretical efficiency is presented, and the effects of design parameters on forces and contact stresses are studied.
About: This article is published in Mechanism and Machine Theory.The article was published on 1983-01-01. It has received 88 citations till now. The article focuses on the topics: Reducer.
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25 Jun 2019
TL;DR: A comparative study of a cycloidal gearbox working with a different kind of bearings shows an increase in the efficiency for the needle bearings compared to sleeves and a very good correlation between calculated efficiency and the efficiency determined during the tests.
Abstract: A comparative study of a cycloidal gearbox working with a different kind of bearings is presented in the article. Two kinds of the bearings used in the cycloidal gearbox are taken into consideratio...
11 citations
TL;DR: In this paper, the kinematic model based on the vector loop approach is developed, and models for analyzing the kinetostatics and mechanical efficiency of roller drives considering friction are proposed.
10 citations
TL;DR: This review article summarizes the main test parameters, analyzes the characteristics of existing methods, and proposes requirements according to the aspects of the mechanical structure, metrology principles, and engineering applications.
10 citations
TL;DR: In this article, the effect of the number of output rollers on the stability and power loss of a cycloidal speed reducer was investigated and the results indicated that the effect was greater than that of the pitch radius of the rollers.
Abstract: The cycloidal speed reducer is used in industry universally. In order to know the influence of the design parameters on the reducer performance, this study proposes a prediction method which cannot only estimate the stability but also forecast the power loss to identify the performance differences of various designs. The design of reducers in this paper follows non-pin designs so that the transmission uses a cycloidal gear and a cycloid internal gear. Firstly, several design cases considering different number and pitch radii of output rollers are used to explain the prediction method and establish statistical math models in which the data is obtained from the reducer dynamic analysis. Then, the variation coefficient of kinematic and stress data is used to predict the stability (or vibrations risk) and efficiency (or power loss), respectively. The results indicate that the effect of the number of output rollers on the stability is greater than that of the pitch radius of the output rollers. Although increasing the number of output rollers may increase the risk of vibrations, the power loss of the speed reducer can be reduced. Besides, the proposed prediction method can also be applied to reducers with multi-cycloidal gears to investigate how non-pin designs affect their overall performance. The results confirm that the stability and efficiency is reduced significantly when the number of cycloidal gears is greater than two, and in such a case, the design of dual cycloidal gears is the best option.
10 citations
TL;DR: In this study, a TLBO algorithm was used for the optimization of a cycloidal speed reducer and the results provide a real picture of the contact in the presence of inevitable machining tolerances.
Abstract: The actual cycloidal speed reducer elements differ from their theoretical ideal due to existing tolerances; therefore, the cycloid disc behaves like a corrected one. This study is oriented towards determining contacts in corrected cycloid speed reducer profiles from the aspect of geometry. Based on this geometry, an objective function was developed for the optimization with some limitations. Heuristic optimization was used to determine the position of the cycloidal drive elements when a contact was established and, consequently, to determine clearances in other places. Some limitations were set so that the model could reflect a real contact. In this study, a TLBO algorithm was used for the optimization of a cycloidal speed reducer. Clearances were analysed for different correction values of the cycloid disc profile of an actual cycloidal drive and the optimization procedure was presented. The results provide a real picture of the contact in the presence of inevitable machining tolerances.
10 citations
Cites background from "Analysis of a cycloid speed reducer..."
...The most commonly used cycloidal speed reducer gear profile is an equidistant shortened epitrochoid [1,2,3], although profile modifications can sometimes be made in order to achieve better performance [4,5,6]....
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