SsangYong Actyon Sports II. Manual - part 17

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Oil pan sassembly

8. OIL PAN

The oil pan in D20DTR engine improves the NVH. Especially, the oil draining is much easier than before.

Components

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9. DUAL MASS FLYWHEEL (DMF) & DRIVE PLATE

1) Overview

Flywheel is installed on crankshaft. When 

starting the engine, this functions as follows:

Reducing the irregular speed of crankshaft 

due to unbalanced combustion -> Improving 

the power train NVH, Improving the driving 

performance

Reducing the clutch noise by using ball 

bearing

Improving the durability of DMF by using 

strong arch spring

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2) Layout

Spring guide

Drive plate

Primary cover

Primary flywheel

Internal/external ring

Secondary flywheel

Ring gear

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Torque change curve of engine and drive shaft

Compression stroke

Combustion stroke

Small changes from engine (k):
Damper increases the torque changes to clutch

Large changes from engine (j):
Damper decreases the torque changes to 
transaxle by absorbing the impact

3) Operation

Compensating the irregular operation of engine: The secondary flywheel operates almost evenly so 

does not cause gear noises

The mass of the primary flywheel is less than conventional flywheel so the engine irregularity 

increases more (less pulsation absorbing effect).

Transaxle protection function: Reduces the torsional vibration to powertrain (transaxle) by reducing 

the irregularity of engine.

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4) Features

Reduced vibration noise from the powertrain by blocking the torsional vibrations

Enhanced vehicle silence and riding comforts: reduced engine torque fluctuation

Reduced shifting shocks

Smooth acceleration and deceleration

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5) Advantages

Improved torque response by using 3-stage type spring: Strengthens the torque response in all 

ranges (low, medium, and high speed) by applying respective spring constant at each range.

Stable revolution of the primary and secondary wheel by using planetary gear: Works as auxiliary 

damper against spring changes

Less heat generation due to no direct friction against spring surface: Plastic material is covered on 

the spring outer surface

Increased durability by using plastic bushing (extends the lifetime of grease)

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6) Drive Plate

Drive plate receives the power from the start motor when starting the engine. With this, the drive plate 

initially drives the power train system. And, it is connected to the torque converter to transfer the engine 

torque to the power train system.

Trigger ring

Drive plate

Components

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