Engine flywheel

Description 1024B

1.9 JTD 8V

CONSTRUCTION FEATURES

In the twin mass DVA (twin damping flywheel) system, one is fixed to the crankshaft and one to the gearbox main shaft with a flexible damping system in between.

The resonance points which, in traditional systems (rigid flywheel and dampened disc) are at 800 and 2200 rpm, are shifted towards lower rotation speeds, outside the usage range, thus permitting greater attenuation of torsional vibrations and a reduction in noise.

The clutch engagement, positioned between the twin flywheel and the gearbox, is made up of a rigid disc (without springs) which, on account of reduced inertia, improves the manoeuvrability of the gearbox.

1 - Crankshaft

2 - Mass fixed to the crankshaft

3 - Mass fixed to the gearbox main shaft

4 - Flexible damping system

5 - Clutch plate

6 - Pressure plate spring

7 - Thrust bearing

8 - Gearbox main shaft

9 - Ring gear

1.9 JTD 16V

CONSTRUCTION FEATURES

Twin flywheel shock absorber (DVA) This flywheel consists of two masses, one of which is fixed to the crankshaft and the other to the gearbox main shaft through the clutch plate. There is a twin ramp flexible damping system between these two masses produced through two pairs of springs whose intervention is differentiated according to the torque transmitted.

The clutch engagement, positioned between the twin flywheel and the gearbox, is made up of a rigid disc (without springs) which, on account of reduced inertia, improves the manoeuvrability of the gearbox.

1 - Mass fixed to the crankshaft

2 - Mass fixed to the gearbox main shaft

3 - Flexible damping system

4 - Ring gear

Diagram showing operation of twin ramp flexible damping system