OEM Custom Gear Internal, Annulusmagiya amkatiNdi zinthu zofunika kwambiri m'ma gearbox akuluakulu a mafakitale, zomwe zimapereka mphamvu yotumizira bwino komanso mapangidwe osungira malo. Ma gear awa, omwe ali ndi mano mkati mwake, amagwira ntchito bwino ndi ma gear a mapulaneti kuti agawire mphamvu ndikuchepetsa liwiro moyenera. Kapangidwe kake kolimba kamatsimikizira kulimba kwambiri, zomwe zimapangitsa kuti zikhale zoyenera kugwiritsidwa ntchito molimbika monga makina olemera, zida zamigodi, komanso kupanga magetsi. Kapangidwe kolondola ka ma gearbox amkati a annulus kumathandiza kuti ma gearbox a mafakitale akhale odalirika komanso ogwira ntchito bwino, kuthandizira magwiridwe antchito osalala ngakhale atakhala ndi katundu wolemera kwambiri. Kusinthasintha kwawo komanso kugwira ntchito bwino kwawo kumapangitsa kuti akhale ofunikira kwambiri m'mafakitale amakono.
Pali mizere itatu yopangira yokha yopangira magiya amkati, skiving.