VN 4.003: 1. Coaxial clutch release mechanism with release pad position sensor; 2. Wiring harness for the gearbox control system; 3. Position sensor of the central gear shift rod; 4. Oil tank ventilation; 5, Hydraulic cylinder; 6. Clutch speed sensor; 7. Pressure sensor in the hydraulic system; 8. Vehicle speed sensor; 9. Pressure accumulator; 10. Oil reservoir; 11. Valve block; 12. Control valves for hydraulic cylinders; 13, clutch control valve; 14. Hydraulic pump; 15. Clutch control tube; 16. Central shift rod
Such gearboxes are called Sprintshift transmission. These gearboxes replaced the previously produced automatic transmission type W4A02S.
It should be noted that automated checkpoints are not compatible with some systems such as «start-stop».
The use of a hydraulic drive allows the gearbox to be used both in fully automatic mode, when the driver does not take part in the gear shifting process, and in semi-automatic mode, when the gear selection is set by the driver using the gear selector. At the same time, the process of disengaging the clutch and actually shifting gears also occur without the participation of the driver.
VN 4.004: 1. Valve block; 2. Nut for fastening the pressure oil supply line; 3. Branch pipe of the drain line; 4, oil filter in the pressure channel; 5. Clutch control channel output; 6. An actuator that turns the main shaft of the gear shift mechanism; 7. Solenoid valve (Y90), which controls the supply of pressure to the clutch control mechanism; 8. Solenoid valve (Y91) pressure relief in the hydraulic drive of the gearbox control (upon reaching the end position of each of the hydraulic actuators); 9. Solenoid valve (Y92/1) inclusion of 1st, 3rd, 5th gears; 10. Solenoid valve (Y92/2) engaging 2nd, 4th, 6th gears and reverse gear