Engine flywheel

Description 1024B

1.2 16v, 1.4 16v

In cast iron, with a press-fitted steel ring gear.

The flywheel is bolted by a flange to the crankshaft.

1.8 16v

In cast iron, with a press-fitted steel ring gear.

The flywheel is bolted by a flange to the crankshaft.

2.4 20v

Type

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, are located at 800 and 2200 rpm, have been moved towards lower rotation speeds, outside of the usage range.

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 8v

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, are located at 800 and 2200 rpm, have been moved towards lower rotation speeds, outside of the usage range.

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

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

1.2 16v, 1.4 16v

This makes the engine turn smoothly. It accumulates energy during active stages (expansions) and returns it during passive stages.

The flywheel is designed to allow the engine to idle without stalling and overcome the friction developed by the engine during no-load operation.

1.8 16v

OPERATION

This makes the engine turn smoothly. It accumulates energy during active stages (expansions) and returns it during passive stages.

The flywheel is designed to allow the engine to idle without stalling and overcome the friction developed by the engine during no-load operation.

1.9 JTD 16v

Diagram showing operation of twin ramp flexible damping system