Theoretical evaluation of efficiency of a spherical ball gear operating in the multiplier mode

The paper considers issues of creating multipliers for the medium power wind generators. It proposes a basic kinematic diagram of the multiplier mechanism based on the spherical ball gear. The satellite makes a spherical motion during the gear operation, and the intermediate rolling elements mounted on the satellite in two rows are moving along the drive shaft and the housing sleeve treads. The gear under study makes it possible to realize large values of the gear ratios and speed multiplication factors with small overall dimensions and weight, respectively. An algorithm was developed for theoretical determination of the gear average efficiency in the reducer and multiplier modes depending on its geometric parameters and friction coefficients. The paper studies influence of the multiplier coefficient transfer, difference in the number of balls in the satellite rows and friction coefficient on the efficiency. Computer simulation results of the gear operation were received in the NX system, which confirmed the obtained theoretical dependencies.