Ngwana-ezo aka gia na rim nke na-aga n'ihu meshing nnyefe nke ije na ike nke n'ibu components, site gia nha nha, nha nha uzo, ọgwụgwụ ihu, nkịtị ihu, eze n'elu okirikiri, eze mgbọrọgwụ okirikiri, isi okirikiri, nkerisi okirikiri na ndị ọzọ. akụkụ, ọ na-ọtụtụ ebe na-eji n'ibu nnyefe na dum n'ibu ubi.
The ọrụ nke gia bụ tumadi na-ebunye ike, ọ nwere ike nyefee adiana nke a aro ọzọ aro, dị iche iche gia Nchikota nwere ike ịrụ a dị iche iche ọrụ, nwere ike na-aghọta n'ibu deceleration, ibu, mgbanwe direction na reversing edinam, ihu ọma n'ibu ngwaọrụ bụ. enweghị ikewapụ na gia.
Enwere ọtụtụ ụdị gia.Dị ka nkewa nke gia aro, ọ nwere ike kewaa ụzọ atọ: yiri aro gia, intersecting shaft gia na staggered aro gia.N'etiti ha, parallel shaft gia na-agụnye spur gia, helical gia, esịtidem gia, ogbe na helical ogbe, etc.Intersecting shaft gia nwere ogologo bevel gia, arc bevel gia, efu bevel gia, etc.The staggered shaft gia nwere staggered shaft helical. ngwa, ikpuru gia, hypoid gia na na.