W203 since 2000 of release
Repair and operation of the car
+ Mercedes-Benz cars of class C (W-203)
+ Operation manual
+ Routine maintenance
+ Cooling system and heating
+ Power supply system and release
+ Engine electric equipment
+ Manual transmission
- Automatic transmission
- The automated box of gear shifting 716.6
Elements of hydraulic management automated by the Sequentronic check point
Elements of electronic control and signals of the control unit automated by the Sequentronic check point
+ Automatic transmission 722.6
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
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The automated box of gear shifting 716.6
Elements of hydraulic management automated by the Sequentronic check pointHinged elements automated by the Sequentronic check point
Elements of a hydraulic actuator of management of coupling and switching automated by the Sequentronic check point
The hydraulic control unit automated by the check point (Sequentronic)
The hydraulic pump automated by the Sequentronic check point
Sequentronic coupling hydraulic actuator
Functioning of a hydraulic actuator of coupling
Principle of functioning of the hydraulic control unit
Supply of oil to electromagnetic valvesThe oil (Pentosin) forced by the hydraulic pump on the steel line moves in valvate assembly (2), is pumped over through an oil filter (2s) and via the control valve arrives to electromagnetic valves of coupling (Y90), switchings (Y92/1 and Y92/2) and braking (Y91)
Management of coupling
Activation of the electromagnetic valve of coupling (Y90) is carried out on command from the control unit of transmission (N15/6) and provides supply of oil on the pressure head line connected to the socket of the coupling drive, (2D) in executive knot.
Management of gear shifting
Depending on the current traffic conditions the control unit (N15/6) makes activation of the corresponding electromagnetic valve of switching (Y92/1 or Y92/2) of valvate assembly. The activated valve provides giving of hydraulic pressure in the switching cylinder influencing the central rod of switching and providing the choice of the required transfer by means of the corresponding connecting elements to transmissions.
Principle of functioning of the hydraulic pump
The electric motor (4) is activated at the command of the control unit (N15/6) and provides the drive of the gear pump connected to the coupling (4a).
Rotation of gear wheels provides absorption of working liquid (oil) via the inlet socket (4b), its compression and giving under pressure via the socket (4s).
The pump also provides pumping of oil in a receiver of system pressure.
Principle of functioning of a hydraulic actuator of coupling
The working piston (13g) under the pressure of hydraulic pressure is displaced forward in the coupling (13h). The persistent ring (13b) wrings out a disk spring and activates coupling.
Internal sealing is provided at the expense of a sealant (13f).
The protective cover (13d) provides protection of a moving surface of the release device of coupling against dirt hit. The preloading spring (13e) provides minimization of initial loading of the drive of the release bearing for the purpose of decrease in level of a noise background.
At the switched-off coupling
The control unit (N15/6) activates the electromagnetic valve (Y90) in valvate assembly (V) which provides giving of hydraulic pressure (r) in the release device(s). The working piston (A2) is displaced forward, towards a disk spring. The persistent ring nestles on a disk spring, providing its dehiscence.
At the included coupling
The valve (Y90) in valvate assembly (V) is not activated and the returnable spring holds it in basic situation. As a result the pressure chamber of I in the hydraulic release device(s) turns out unloaded what guarantees existence of communication with final port of the oil tank (0).