MUHARRIKI VANKEL, muharriki darunsuzi rotoriyu porsheniro guyand, ki konstruksiyaashro soli 1957 injener F. Vankel (F. Wankel, RFG) ikhtiro kardaast. Dar Muharriki Vankel rotori (porsheni) charkhzananda istifoda meshavad, ki sathi on shakli epitrokhoidaro (nig. Trokhoida) do rad. Rotori ba navard nasbshuda ba charkhi dandonador, charkh boshad dar navbati khud ba shesternai sokin mustahkam payvast meboshad. Rotor yakjoya bo charkhi dandonador guyo dar girdi shesterne megelad. Ruyahoi rotor az rui sathi epitrokhoidalii silindr lagjida dar kamerai silindr hajmoi tagyiryobandaro judo mekunand (nigared rasm, a). Chunin konstruksiya imkoniyat medihad, ki sikli 4-takta be yorii mekhaniami taqsimoti gaz ba amal barovarda shavad. Plastinaoi radiali va padhluie, ki bo tasiri quvvai markazgurez, fishori gaz va prujinaho ba devorhoi silindr jafs meshavand, kamerahoro havonoguzar mekunand. Tayer shudani suzishvori, afruzish, ravganmoli, khunukshavi, korandozii Muharriki Vankel misli muharriki darunsuzi porshenii muqarrari ast.
Muharrikhoi rotorii seruya mamul gashtaand, ki dar onho nisbati radiusi shesterna va charkhi dandonador chunin ast: g : R = 2 ; 3 (rasmi b), chunin muharrikhoro asosan dar avtomobilho, zavraqho va gayra meshinonand. Massa va andozahoi Muharriki Vankel nisbat ba muharrikhoi darunsuzi mu-qarrarii iqtidorashon yakkhela 2—3 marotiba khurd meboshad. Istehsoli sanoatii Muharriki Vankel dar Respublikai Federativii Germaniya, Yaponiya va Shtathoi Muttahidai Amerika ba roh monda shudaast.