CHANGING PRODUCTION ACCURACY OF CYCLOIDAL WHEELS AT PRESERVATION OF TRANSMISSION KINEMATIC PARAMETERS

The PURPOSE of this paper is search for the opportunity to decrease the production accuracy of wheel profile surfaces when the accuracy of transmission with intermediate rolling bodies and a free bracket remains the same to reduce the production cost of critical parts. METHODS. The production accuracy analysis is carried out using the analytical methods of complete and incomplete interchangeability taking into account the features of transmission linkage with intermediate rolling bodies and a free bracket. RESULTS AND THEIR DISCUSSION. When part accuracy decreases without any change in fit combinations the manufacturing clearance in the transmission linkage with intermediate rolling bodies and a free bracket increases as an arithmetic progression (when the accuracy decreases by one accuracy grade the clearance increases at 20µm minimum). It can have a negative effect on transmission operation. At the same time the change in fit combination and decrease in part accuracy results in the reduced manufacturing clearances in the transmission linkage with intermediate rolling bodies and a free bracket. The origination of a limit manufacturing clearance is the most probable under production of parts by upper or lower tolerance deviations of size. When changing fit combinations of mate parts from H7-h6-h7 to H8-h8-k7 it is possible to reduce the maximum manufacturing clearance by 12 µm and limit clearances up to 8 µm. CONCLUSIONS. It is found that it is possible to select the combinations of mate part fits in the transmission with intermediate rolling bodies and a free bracket to reduce their production accuracy on one side and preserve the transmission accuracy not lower than the start production level on the other. The selection of optimal fit combination and accuracies will allow to reduce the production cost of vital parts of transmission with intermediate rolling bodies and a free bracket as well as to increase the competitiveness of these transmissions on the market.

production accuracy, cycloidal transmission, kinematic parameters, tolerances, size deviations, manufacturing clearance

1. Lustenkov M.E. Strength calculations for cylindrical transmissions with compound intermediate rolling elements // Int. J. of Mechanisms and Robotic Systems. 2015. Vol. 2. No. 2. P. 111-121.

2. Yunhong Meng, Changlin Wu, Liping Ling Mathematical modeling of the transmission performance of 2K-H pin cycloid planetary mechanism // Mechanism and Machine Theory. 2007. Vol. 42. P. 776-490.

3. Bingkui Chen, Hui Zhong, Jingya Liu, Chaoyang Li, Tingting Fang Generation and investigation of a new cycloid drive with double contact // Mechanism and Machine Theory. 2012. Vol. 49. P. 270-283.

4. Junhua Bao, Weidong He Parametric Design and Efficiency Analysis of the Output-PinWheel Cycloid Transmission // International Journal of Control and Automation. 2015. Vol. 8. No. 8. P. 349-362.

5. Панкратов Э.Н. Проектирование механических систем автоматизированных комплексов для механообрабатывающего производства: практикум лидера-проектировщика. Томск: Изд-во Томского университета, 1998. 296 с.

6. Компания «SIMACO» [Электронный ресурс]: URL: http://www. http://smc.tomsk.ru/ (15.01.2015).

7. Lustenkov M.E. Strength calculations for cylindrical transmissions with compound intermediate rolling elements // Int. J. of Mechanisms and Robotic Systems. 2015. Vol. 2. No. 2. P. 111-121.

8. Лустенков М.Е., Сазонов И.С. Оценка ресурса и нагрузочной способности передач с составными промежуточными элементами // Актуальные вопросы машиноведения: сб. науч. тр. 2014. Вып. 3. С. 189-191.

9. Лустенков М.Е. Критерии прочности механических передач с составными промежуточными элементами качения // Вестник Белорусско-Российского университета. 2015. Т. 49. № 4. С. 33-41.

10. CHEN Bing Kui, FANG TingTing, LI ChaoYang, WANG ShuYan Gear geometry of cycloid drives // Sci China Ser E-Tech Sci. 2008. Vol. 51. No. 5. P. 598-610.

11. Mihailidis A., Athanasopoulos E., Agouridas K. EHL film thickness and load dependent power loss of cycloid reducers // Mechanical Engineering Science. 2016. Vol. 230. Issue 7-8. P. 1303-1317. DOI: 10.1177/0954406215612815

12. Покатилов Д.А., Ефременков Е.А. Анализ технологического процесса изготовления циклоидального профиля деталей передачи с промежуточными телами качения // Известия Самарского научного центра РАН. 2015. Т. 17. № 2 (4). С. 868-873.

13. Efremenkov E.A., An I-Kan Euler-Savari Determination of Radii of Curvature of Cycloid Profiles // Russian Engineering Research. 2010. Vol. 30. No. 10. P. 1001-1004.

14. An I-Kan, Il'in A.S., Lazurkevich A.V. Aspects of geometric calculation of the planetary gear train with intermediate rollers. Part 1 // IOP Conf. Series: Materials Science and Engineering. 2016. Vol. 124. 012003, 5 p. DOI:10.1088/1757-899X/124/1/012003

15. An I-Kan, Il'in A.S., Lazurkevich A.V. Load analysis of the planetary gear train with intermediate rollers. Part 2 // IOP Conf. Series: Materials Science and Engineering. 2016. Vol. 124, 012004, 6 p. DOI: 10.1088/1757-899X/124/1/012004.

16. Efremenkov E.A., Kobza E.Е., Efremenkova S.K. Force Analysis of Double Pitch Point Cycloid Drive with Intermediate Rolling Elements and Free Retainer // Applied Mechanics and Materials: Scientific Journal. 2015. Vol. 756. P. 29-34.

17. Ефременков Е.А. Разработка и проектирование передач с промежуточными телами качения нового вида // Известия ТПУ 2005. Т. 308. № 1. С. 131-135.

18. Допуски и посадки: Справочник / В.Д. Мягков. В 2-х ч. 6-е изд., перераб. и доп. Л.: Машиностроение. 1982. Ч. 1. 543 с.