ABSTRACT
Different ways exist to denote various types of Planetary gear trains (PGT), but unfortunately, there is not a uniform and internationally accepted classification. PGTs are designed in a way that they possess at least one gear wheel, most often more than one, and these are called planets, mounted on the so-called carrier, which perform a double rotation—around their geometrical axis and together with the same axis around the main geometrical gear train axis. Unlike the non-PGTs, the PGTs, which are cylindrical, bevel, worm, and crossed-helical, encompass a comparatively extensive technical field. At PGTs, using one-rim planets, a line is placed above the corresponding indications, whereas the indication of the gear train with two-rim planets is without a line. Unlike the non-PGTs, the PGTs in general have considerably more capabilities and various applications. They are designed to perform summation or division of motion and change the direction of rotation, that is, reversing.
