VARIABLE GEAR RATIO TRANSMISSION Russian patent published in 2012 - IPC F16H47/04 F03D11/02 

FIELD: transport.

SUBSTANCE: transmission comprises main differential gear 120 with invariable gear ratio adjusted by reactive torque provided by rpm control gear 150 inside man gearbox. Note here that it comprises also extra differential gear 220 in rotary engagement to input 50 via first flow 115 and with rotary engagement with gear 150 controlling rpm via second flow 125. Note here that extra differential gear comprises two parallel power flows P' and P". First flow comprises hydraulic bypass line with two hydraulic devices 180, 500 making hydraulic circuit. Transferred power and direction of it transfer in circuit P' with bypass line vary in operation are selectively varied in operation to vary speed in path P'', thus, varying power in second part and reactive torque of rpm control gear, thus, adjusting gear ratio. Transmission exploits first and second paths for entire range of input rpm.

EFFECT: simplified design, decreased dimensions, weight and costs.

11 cl, 8 dwg