Tangira

Nko mu myaka ya 1830 nyuma gato yo kuvuka kwimodoka ya parike, abantu bamwe batekereje guha uruziga rwimodoka gushiraho ibiti na rubber "tracks", kugirango imodoka ziremereye zishobora kugenda kubutaka bworoshye, ariko imikorere yambere yo gukoresha no gukoresha ntabwo ari nziza, kugeza mu 1901 ubwo Lombard muri Reta zunzubumwe zamerika yatunganyaga imodoka ikurura amashyamba, gusa bahimbye inzira yambere ningaruka nziza zifatika. Nyuma yimyaka itatu, injeniyeri ya Californiya, Holt yakoresheje igihangano cya Lombard mugushushanya no kubaka traktor “77 ″.

Nibimashini yambere yakurikiranwe kwisi. Ku ya 24 Ugushyingo 1904, iyo romoruki yakorewe ibizamini bya mbere nyuma iza gushyirwa mu bikorwa byinshi. Mu 1906, uruganda rukora amamodoka ya Holt rwubatsemo lisansi ya mbere y’imbere y’umuriro wa moteri ikoreshwa na moteri ya crawler, yatangiye gukora cyane mu mwaka wakurikiyeho, niyo romoruki yatsindiye icyo gihe, maze iba prototype y’ikigega cya mbere ku isi cyakozwe n’abongereza nyuma yimyaka mike. Mu 1915, Abongereza bakoze ikigega cya “Little Wanderer” bakurikira inzira ya romoruki y'Abanyamerika “Brock”. Mu 1916, tanki yatejwe imbere n’Ubufaransa “Schnad” na “Saint-Chamonix” yakurikiranye inzira za za romoruki zo muri Amerika “Holt”. Abashoferi binjiye mu mateka ya tanki mu gihe cy'impeshyi n'itumba bigera kuri 90 kugeza ubu, kandi inzira z'uyu munsi, tutitaye ku miterere cyangwa ibikoresho byubatswe, gutunganya, n'ibindi, zihora zitungisha inzu y'ubutunzi bw'ikigega, kandi inzira zateye imbere mu bigega bishobora kwihanganira ikizamini cy'intambara.

Shiraho

Inzira ni urunigi rworoshye rutwarwa niziga rikora ruzengurutse ibiziga bikora, ibiziga biremereye, ibiziga byinjira hamwe na pulleys. Inzira zigizwe n'inkweto za track na pin. Amapine yinzira ahuza inzira kugirango akore umurongo. Impera zombi zinkweto zumuhanda zirazengurutswe, zifatanije nuruziga rukora, kandi hariho amenyo atera hagati, akoreshwa mu kugorora inzira no kubuza inzira kugwa mugihe ikigega cyahinduwe cyangwa kizunguruka, kandi hariho urubavu rukomeye rwo kurwanya kunyerera (rwitwa ishusho) kuruhande rwubutaka kugirango uhindure imbaraga zinkweto zumuhanda hamwe no gufatana kumurongo.