Automatic hydromechanical transmissions of motor vehicles in the USSR Online publication date: Sun, 25-May-2014
by A.N. Narbut
International Journal of Vehicle Design (IJVD), Vol. 2, No. 4, 1981
Abstract: Current designs of Soviet hydromechanical transmissions (HMTs) for buses, trucks and passenger cars are briefly described. Not all the HMTs feature automatic gear changes, but every one of them incorporates a torque converter and uses friction elements and, in some cases, one-way clutches, to effect the gear changes. The HMTs of buses incorporate two-, or three-speed nonplanetary gear trains. Three- and five-speed nonplanetary gear trains are used in the HMTs of BelAZ quarry dump trucks and three- and four-speed planetary gear trains are used in the HMTs of heavy duty MAZ all-terrain wheeled tractors. The HMTs of the passenger cars ZIL and GAZ have three-speed planetary gear trains. Two HMTs with three-speed gear trains for passenger cars with engine displacements of 1.2-2.01 have been designed: a planetary type, made in cooperation with Czechoslovakia, and a nonplanetary type, made by the Izhevsk car plant. Both have been treated for significant increase in efficiency.
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