- 1 - engine
- 2 - clutch
- 3-speed gearbox
- 4 — gearbox drive shaft
- 5 — driven shaft of the gearbox
- 6 — differential
- 7 - angular transmission
- 8 - cardan shaft
- 9 - viscous coupling
- 10 — rear drive axle
- 11 - freewheel mechanism
- 12 — differential
- W1 - Front angular gear
- W2 - rear angular gear
- T - tachometer drive
- A - main gear
PASSAT vehicles with a synchronizing device are equipped with all-wheel drive. A distinctive feature is the presence of a viscous coupling between the front and rear axles.
The information is available on the website (www.vwmanual.ru)
The viscous coupling consists of a housing filled with silicone oil, in which there are closely spaced disks, between which there is no mechanical connection. Some disks (every other) connected to the coupling body (and thus with the cardan shaft), and others - with the rear axle drive shaft. The power engagement occurs due to the viscosity of the silicone oil, which reacts to the difference in the rotation speed of the plates. The greater the difference in rotation speed between the front and rear axles, the greater the torque transmitted from the front axle to the rear. The rear wheel drive is smooth and without jolts, the driver barely notices it.
On dry roads and normal driving, when all wheels rotate at approximately the same speed, almost all torque is transmitted to the front wheels. However, if, under strong acceleration or on a bad road, the front wheels tend to slip, i.e. they begin to rotate faster than the rear wheels, the viscous coupling immediately transmits more force to the rear axle. If the front wheels slip, then almost all torque is transmitted to the rear wheels.
When braking, the freewheel mechanism in the rear axle differential is automatically activated and breaks the power flow to the rear axle. Due to this, the correct distribution of braking forces is not disturbed and the vehicle's movement remains stable.
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