Isethi yegiya leplanethi ingasetshenziswa esikebheni sikaseyili ukuze kuhlinzekwe izilinganiso zamagiya ahlukahlukene, okuvumela ukudluliswa kwamandla okusebenzayo kanye nokulawulwa kwesistimu yokuqhuba isikebhe.
I-Sun Gear: Igiya lelanga lixhunywe kusithwali, esibamba amagiya eplanethi.
I-Planet Gears: Amagiya amaningi eplanethi ahlanganiswe negiya lelanga kanye negiya lendandatho yangaphakathi.Lawa magiya eplanethi angakwazi ukuzungeza ngokuzimela kuyilapho ezungeza igiya lelanga.
Igiya Leringi: Igiya leringi langaphakathi ligxiliswe ku-propeller shaft yesikebhe noma kusistimu yokudlulisa yesikebhe.Ihlinzeka ngokujikeleza kwe-shaft okukhiphayo.