VEHICLE GEARBOX Russian patent published in 1995 - IPC

FIELD: transport engineering. SUBSTANCE: gearbox has input shaft 1, output shaft 2, unadjustable hydraulic pump 3, at least two unadjustable hydraulic motors 4 and 5, and planetary mechanism with sun gears 6,9, carrier 7 and planet pinions 8. Input shaft 1 is coupled with carrier 7 through gears 10 and 11, and hydraulic pump 3 is coupled with sun gear 6 through gears 13 and 12; hydraulic motor 4 is coupled with sun gear 9 through overrunning clutch 21 and gears 22 and 23; hydraulic motor 5 is coupled with sun gear 9 through overrunning clutch 24 and gears 25 and 23; sun gear 9 is connected with output shaft 2 through countershaft 14 and mechanical reduction gear 15. Four-position four-line control valve unit 16 provides connection of delivery line of hydraulic pump 3 with hydraulic motors 4 and 5 in definite sequence, as a result summary volume of hydraulic motors is changed, and definite ratio is set. Hydraulic motors, when not to operate, are disconnected by means of overrunning clutches 21 and 24. EFFECT: enlarged operating capabilities. 2 cl, 2 dwg, 1 tbl