Pic. 3.42. Components of a hydromechanical gearbox.
1 - torque converter; 2 - damper; 3 - planetary gear of the torque converter; 4 - turbine shaft; 5 - shaft II gear; 6 - planetary gear box; 7 - freewheel; 8 - direct clutch; 9 - clutch II gear; 10 - reverse clutch; 11 - band brake; 12 - oil pump; 13 - output gear; 14 - intermediate gear; 15 - driven gear of the main gear; 16 - valve box; 17 - regulator.
From the output gear 13, the torque is transmitted to the driven gear of the final drive 15 through the intermediate gear 14. The torque converter 1 transmits the engine torque to the gearbox. Under certain conditions, it increases the transmitted torque due to the transformation ratio. In addition, in II and III gears, it redistributes the transmitted torque to the torque transmitted hydraulically and to the torque transmitted mechanically. Damper 2 dampens the vibrations transmitted from the engine to the gearbox when transmitting torque mechanically.
The planetary gear 3 of the torque converter is designed to redistribute the torque to the torque transmitted hydraulically and the torque transmitted mechanically depending on the speed of the vehicle.
The turbine shaft 4 transmits hydraulic torque from the torque converter.
Shaft 5 of the 2nd gear transmits torque through the 2nd gear clutch and the crown gear of the planetary gear. Planetary gear 6 provides forward movement in three gears and reverse movement depending on the position of the clutches and the band brake. The freewheel clutch 7 of the planetary gear transmits torque from the turbine shaft to the ring gear of the 1st gear and the reverse gear of the planetary gear (clockwise rotation) The direct clutch 8 blocks the turbine shaft with the sun gear of the 1st gear and reverse gear of the planetary gear. 2nd gear clutch 9 locks the 2nd gear shaft with planetary ring gear to 2nd and direct (III) transfers.
Reverse clutch 10 blocks the planetary ring gear in reverse.
Band brake 11 blocks the drum and front sun gear in I and II gears. The brake is actuated by the piston rod and the piston itself is controlled by oil pressure.
The oil pump 12 continuously supplies oil under pressure for the operation of the hydromechanical transmission, for its lubrication and cooling. The pump begins to work after starting the engine and is driven by a hexagonal shaft from the torque converter cover.
The output gear 13 transmits the torque received from the gearbox to the differential. The intermediate gear 14 and the driven gear 15 of the final drive drive the differential.
Valve box 16 supplies pressurized oil to the torque converter, band brake, servo, clutches, and shift control.
The controller 17 controls gear shifting depending on the vehicle speed. It is driven by a worm gear mounted on the differential.
Oil cooler. The oil is cooled in the space between the two radiator tubes of the engine cooling system.
Pic. 3.43. Details of the hydromechanical gearbox.
1 - selector; 2 - oil pump assembly; 3 - thrust washer No. 12; 4 - needle bearing No. 11; 5 - clutch II gear assembly; 6 - manhole cover of the valve box; 7 - reverse clutch assembly; 8 - band brake servo assembly; 9 - valve box; 10 - valve box cover; 11 - needle bearing No. 10; 12 - direct clutch; 13 - thrust washer No. 9; 14 - thrust washer No. 8; 15 - ring gear; 16 - needle bearing No. 7; 17 - band brake; 18 - needle bearing No. 6; 19 - output gear cover; 20 - needle bearing No. 3; 21 — output gear; 22 - needle bearing No. 2; 23 - needle bearing No. 1; 24 - carrier; 25 - thrust washer No. 5; 26 - front sun gear and drum; 27 - thrust washer No. 4; 28 - intermediate gear; 29 - freewheel planetary gear; 30 - sun gear of the 1st gear and reverse gear with a freewheel cage and a direct clutch hub; 31 — epiploons of shafts of drives of forward wheels; 32 - differential bearing cage; 33 - bearing race gasket: 34 - adjusting ring; 35 - differential assembly with driven gear and parking brake sector; 36 - oil filter with gasket; 37 - oil sump; 38 - centrifugal regulator cover with clamp and gasket; 39 - centrifugal regulator; 40 - speedometer drive gear with gasket.
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