Curs-7

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  CALCULUL SI CONSTRUCTIA AUTOMOBILELOR -I- Curs 7  CUTII DE VITEZA CU VARIATIE CONTINUA (VARIATOARE DE TURATIE) Avantaje: -posibilitatea obtinerii variatiei continue a turatiei la arborele de iesire-apropierea curbai de tractiune reale de cea teoreticaDezavantaje:-constructie complicata-precizie ridicata de executie-contin elemente supuse la solicitari mari-pret ridicatClasificare:-mecanice (cu frictiune)-electrice-hidraulice (hidrostatice si hidrodinamice)  VARIATOARE DE TURATIE CU FRICTIUNE  = 0,2...0.3 uscat  = 0,04...0.05 cu ungereHRC = 60..64p adm = 800MPa Raportul real de transmitere difera de cel teoretic datorita alunecarilor  -randamentul transmisiei; M 1,2 -momentele pe arborele conducator si condus;  1,2 -vitezele unghiulare ale arborilor conducator si condus; k -coeficient de transformare; i -raport de tranmitere  VARIATOARE DE TURATIE CU FRICTIUNEvarianta constructiva 1,3 -roti toroidale; 2 -role de presiune; 5 -corpuri de apasare (bile)
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