Influence of Parameters of a Planetary Gear with Internal Meshing on Its Technical and Economic Indicators

Suntsov A.S., Vychuzhanina E.F., Perminova O.M.

Abstract


Designs of a gear planetary transmission containing an eccentric carrier, one or two satellites and a stationary central wheel with internal teeth, characterized by a roller design of the mechanism for removing movement from the satellites, have a high load capacity and high efficiency with a large gear ratio in one stage (designs are protected by patents for inventions). To optimize the parameters of these planetary mechanisms and improve their technical and economic indicators, a dependence was obtained that determines the ratio between the permissible loads in the meshing of wheels, corresponding to the contact and bending strength of teeth, on their number and gear ratio. It was found that at large gear ratios (more than 17) the load capacity of this type of gear is limited by the bending strength of the wheel teeth. This was used to determine the allowable torque on the output shaft of the transmission and its ratio to the volume of the stationary central wheel, which determines the mass and volume of the transmission as a whole. It is shown that the planetary gear with the difference in numbers of teeth of the satellite and the central gear equal to one has the greatest load capacity for a given gear ratio and volume of the stationary central wheel (and, consequently, the volume of the transmission as a whole). The efficiency of a planetary gear with a roller version of the mechanism for removing movement from the satellites was determined experimentally on a specially created installation containing an electromagnetic loading device and strain gauge torque sensors (with rational transmission parameters and its gear ratio not exceeding 60, the efficiency is 85...90 %). The efficiency of a similar transmission with a traditional pinion mechanism for removing movement from the satellites is about 5 % lower than the efficiency of a gear-roller transmission. With an increase in the gear ratio, the efficiency of the planetary gear decreases.

Keywords


planetary gear; load capacity; efficiency

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DOI: http://dx.doi.org/10.22213/2413-1172-2021-2-46-52

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