Experimental study of gaps in the planetary gear engagements

The paper considers a problem of load distribution between the planetary gear satellites. Relevance of the problem under study lies in increasing the gear service life by a more uniform distribution of the input torque to all the satellites. The paper analyzes samples of the three-satellite planetary gears (gearboxes manufactured by the domestic (Uralreduktor) and foreign (Caterpillar and Komatsu) companies. It confirms experimentally the absence of simultaneous contact between all the gear wheels. This indicates that the gearbox performance is ensured by the gaps introduced at the assembly stage. Jamming is prevented due to partial absence of contacts between the wheel’s teeth. The obtained experimental results correspond to the data of the mobility analysis, and confirm presence of the redundant connections in the plane motion. Based on results of the conducted study, a new three-satellite planetary gearbox with the compound carrier is developed, providing a possibility of a variable distance between certain satellites, which contributes to a more uniform distribution of the input torque.
EDN: HZZTQV, https://elibrary/hzztqv

References

[1] Jelaska D.T. Gears and gear drives. Wiley, 2012. 464 p.

[2] Vullo V. Gears. Vol. 1. Geometric and kinematic design. Springer, 2020. 844 p., https://doi.org/10.1007/978-3-030-36502-8

[3] Glazunov V.A., Albagachiev A.Y., Erofeev M.N. et al. Development and investigation of a parallel-structure mechanism with toothed gears taking into account friction. J. Mach. Manuf. Reliab., 2022, vol. 51, no. 2, pp. 143–152, doi: https://doi.org/10.3103/S1052618822020042

[4] Laryushkin P., Antonov A., Fomin A. et al. Novel reconfigurable spherical parallel mechanisms with a circular rail. Robotics, 2022, vol. 11, no. 2, art. 30, doi: https://doi.org/10.3390/robotics11020030

[5] [Fomin A., Antonov A., Glazunov V. Forward kinematic analysis of a rotary hexapod. In: ROMANSY 23 — Robot design, dynamics and control. Springer, 2021, pp. 486–494, doi: https://doi.org/10.1007/978-3-030-58380-4_58

[6] Rudenko N.F. Planetarnye peredachi. Teoriya, raschet, primenenie i proektirovanie [Planetary gears. Theory, calculation, application and design]. Moscow, Leningrad, Mashgiz Publ., 1947. 756 p. (In Russ.).

[7] Chen Z., Shao Y. Dynamic features of planetary gear train with tooth errors. Proc. Inst. Mech. Eng. C J. Mech. Eng. Sci., 2015, vol. 229, no. 10, pp. 1769–1781, https://doi.org/10.1177/0954406214549503

[8] Li M., Xie L., Ding L. Load sharing analysis and reliability prediction for planetary gear train of helicopter. Mech. Mach. Theory, 2017, vol. 115, pp. 97–113, https://doi.org/10.1016/j.mechmachtheory.2017.05.001

[9] Jiang F., Ding K., He G. et al. Vibration fault features of planetary gear train with cracks under time-varying flexible transfer functions. Mech. Mach. Theory, 2021, vol. 158, art. 104237, doi: https://doi.org/10.1016/j.mechmachtheory.2020.104237

[10] Han H., Ma H., Tian H. et al. Sideband analysis of cracked planetary gear train considering output shaft radial assembly error. Mech. Syst. Signal Process., 2023, vol. 200, art. 110618, doi: https://doi.org/10.1016/j.ymssp.2023.110618

[11] Pan A.-X., Yang Z.-G. Cause analysis and countermeasure on premature failure of a driven gear for the high-speed train. Eng. Fail Anal., 2022, vol. 139, art. 106487, doi: https://doi.org/10.1016/j.engfailanal.2022.106487

[12] Liu X. Vibration modelling and fault evolution symptom analysis of a planetary gear train for sun gear wear status assessment. Mech. Syst. Signal Process., 2022, vol. 166, art. 108403, doi: https://doi.org/10.1016/j.ymssp.2021.108403

[13] Kudryavtsev V.N. Planetarnye peredachi [Planetary gears]. Moscow, Mashinostroenie Publ., 1966. 307 p. (In Russ.).

[14] Dvornikov L.T., Gerasimov S.P. The fundamental problem megasatellite planetary gear sets and possible ways of their permission. Fundamentalnye issledovaniya [Fundamental Research], 2017, no. 12–1, pp. 44–51. (in Russ.).

[15] Gerasimov S.P., Dvornikov L.T. Samoustanavlivayushchiysya trekhsatellitnyy planetarnyy reduktor [Self-alignment three-satellite planetary gearbox]. Patent RU 2541049. Appl. 06.12.2013, publ. 10.02.2015.