HYDROMECHANICAL GEAR BOX Russian patent published in 2007 - IPC F16H3/66 F16H3/78 B60K17/10 

FIELD: motor transport engineering, in particular, step-by-step planet gear boxes for vehicles.

SUBSTANCE: hydromechanical gear box enabling six forward drives and one backward drive has carter 1, hydraulic transformer 2, input link 3, output link 4 and planetary reduction gear comprising two friction clutches and three friction brakes. Planetary reduction gear consists of three planetary gear sets. First planetary gear set comprises central gear 5, planet carriers 6, and crown gear 7. Second planetary gear set comprises center gear 8, planet carriers 9, and crown gear 10. Third planetary gear set comprises center gear 11, planet carriers 12, and crown gear 13. Input link 3 is connected through friction clutch 14 to interconnected carrier 6 and carrier 9 and through friction clutch 15 to center gear 5. Center gear 8 is connected to input link 3. Center gear 5 is connected to carter 1 of gear box through friction brake 16. Friction brake 17 joins interconnected carrier 6 and carrier 9 to carter 1 of gear box. Friction brake 18 joins center gear 11 to carter 1 of gear box. There are support 19 and booster 25 within gear box carter. Piston 24 is positioned within booster 25 for compressing disks of friction brake 17. Friction disks of friction brake 18 are compressed by means of piston 20. Piston 21 positioned within support is designed for compressing friction disks of friction brake 16. Friction disks of controlled friction clutch 14 are compressed by means of piston 22. Friction disks of controlled friction clutch 15 are compressed by means of piston 23.

EFFECT: improved dynamic characteristics of vehicle and reduced dimensions of gear box.

4 cl, 3 dwg