Hinged elements of an automated checkpoint «Sequentronic»
1 - ventilation cover; 2 - Ventilation valve; 3 - Battery; 4 - Clutch release lever; 5 - Sealing plug; 6 - Front gearbox housing; 7 - Gear recognition switch; 8 - Speed sensor; 9 - Holder for gear recognition sensor; 10 - Gearbox housing; 11 - Pump; 12 - Reservoir; 13 - Hydraulic block
Elements of a hydraulic drive for controlling the clutch and shifting of an automated gearbox «Sequentronic»
Hydraulic control unit for automatic transmission (Sequentronic)
2 - Valve assembly; 2a - Pressure line connector; 2b - Return line connector; 2c - Oil filter; 2d - Clutch pressure line connector; 3 - Executive cylinder; Y90 - Solenoid valve for automatic transmission clutch; Y91 - Automated gearbox braking solenoid valve with built-in pressure reducing valve; Y92/1 - Solenoid valve switching 1, 3, 5; Y92/2 - Switching solenoid valve R, 2, 4, 6
Sequentronic automatic transmission hydraulic pump
4 - Electric motor; 4a - Gear pump; 4b - Oil intake connector; 4c - Pressure line connector; M46 - Sequentronic Hydraulic Pump [ASG]
Sequentronic Clutch Hydraulic
13a - Casing; 13b - Thrust ring; 13c - Balls; 13d - Protective cover; 13e - Preload spring; 13f - Seal; 13g - Working piston; 13h - Coupling; A - Clutch disengaged position; B - Basic position. Clutch engaged; B53 - Clutch stroke sensor
The functioning of the hydraulic clutch
0 - Liquid return channel; A - Central hydraulic clutch release; A1 - Spring; A2 - Working piston; B - Valve assembly; I - Pressure chamber I; p - hydraulic pressure; Y90 - Clutch solenoid valve
The principle of operation of the hydraulic control unit
Oil supply to solenoid valves
Oil pumped by hydraulic pump (Pentosin) is fed through a steel line to the valve assembly (2), pumped through the oil filter (2s) and through the control valve goes to the clutch solenoid valves (Y90), switching (Y92/1 and Y92/2) and braking (Y91)
Clutch control
Clutch solenoid activation (Y90) carried out on command from the transmission control unit (N15/6) and provides oil supply through the pressure line connected to the connector (2d) to the clutch actuator.
Shift control
Depending on the current driving conditions, the control unit (N15/6) activates the corresponding switching solenoid valve (Y92/1 or Y92/2) valve assembly. The activated valve provides hydraulic pressure to the shift cylinder, which acts on the central shift rod and selects the desired gear through the appropriate connectors in the transmission.
The principle of operation of the hydraulic pump
electric motor (4) activated at the command of the control unit (N15/6) and provides a drive for a gear pump connected to the coupling (4a).
The rotation of the gears ensures the suction of the working fluid (oils) through the inlet (4b), its compression and supply under pressure through the connector (4s).
The pump also supplies oil to the system pressure reservoir.
The principle of operation of the hydraulic clutch
Working piston (13g) under the pressure of hydraulic pressure is shifted forward in the clutch (13h). thrust ring (13b) depresses the disc spring and activates the clutch.
Internal sealing is provided by a seal (13f).
Protective case (13d) protects the moving surface of the clutch release device from dirt. Preload spring (13th) minimizes the initial load of the release bearing drive in order to reduce background noise.
With the clutch disengaged
Control block (N15/6) activates the solenoid valve (Y90) in valve assembly (IN), which provides hydraulic pressure (R) into the squeeze device (A). Working piston (A2) moves forward towards the disc spring. The thrust ring is pressed against the disc spring, ensuring its opening.
With the clutch engaged
Valve (Y90) in valve assembly (IN) is not activated and a return spring holds it in its base position. As a result, the pressure chamber I in the hydraulic squeeze device (A) is unloaded, which guarantees communication with the outlet port of the oil reservoir (0).