wall gear group the mechanism body 10 has a structure similar preferably to a rectangular prism on the mechanism body 10 there is a main planet gear slot 11 in semi circular form where the half of the main planet gear 20 is placed with reference to fig2 and 3 said planet carrier 30 comprises a wide part 121 with a hollow cylindrical structure so as to define a cross section similar to a t shape and a narrow part 32 extending at the continuation of said wide part 121 accordingly also the mechanism body 10 has a planet carrier slot 12 with a structure so as to be compliant with the form of the bearing and with a size where half of the planet carrier 30 can be placed at the continuation of said planet carrier slot 12 a ring gear slot 13 with a semi circle form where half of the ring gear 40 is placed is formed the connection aperture 22 of the main planet gear 20 is placed into the narrow part 32 of the planet carrier 30 during assembly the wedge slots 21 321 formed on the external circumference of the inner part of the connection aperture 22 are corresponded to each other and by means of the wedges not illustrated in the figure placed into these slots 21 321 a rigid connection between the main planet gear 20 and the planet carrier 30 is obtained thus the planet carrier 30 rotates together with the main planet gear 20 said gears positioned so as to form a similar structure with the planet gear group comprise a main planet gear.