VEHICLE GEARBOX Russian patent published in 1994 - IPC

FIELD: transport engineering. SUBSTANCE: additional hydraulic machine 8 in gearbox has additional three-position control valve unit 16 to place its main lines 20 and 21 in direct communication with hydraulic tank 15 and main line 22 of main hydraulic machine 7, for return communication of additional hydraulic machine with above-indicated members or for connection with hydraulic tank 15 at disconnection from main line 22 of main hydraulic machine 7. Control over additional control valve unit 16 is provided by two hydraulic cylinders 23 and 24 with spring-loaded pistons. Control lines 25 and 26 of hydraulic cylinders 23 and 24 are connected with additional lines of main five-position control valve unit 13 for selective connection with working fluid source 14 and hydraulic tank 15. EFFECT: enhanced operation reliability. 2 cl, 2 dwg