Title: Automatic hydromechanical transmissions of motor vehicles in the USSR

Authors: A.N. Narbut

Addresses: Professor of Automobile Engineering, Moscow Automobile and Road Construction Institute, USSR

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.

Keywords: vehicle design; automatic hydromechanical transmissions; buses; trucks; passenger cars; design features; layouts; control systems; gear ratios; planetary gear trains; nonplanetary gear trains; USSR.

DOI: 10.1504/IJVD.1981.061251

International Journal of Vehicle Design, 1981 Vol.2 No.4, pp.453 - 462

Published online: 25 May 2014 *

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