5.3.2.2 Viscous damper
A viscous damper (Figure 5-18) is a tuned torsional vibration damper. It consists of two main
parts:
•
The housing (002) is fully sealed and is attached to the crankshaft flange at the free end.
•
The inertia ring (004) is in the housing. The bearing (005) holds the inertia ring in the
housing.
Between the housing and the inertia ring there is a layer of silicone oil (006) of a specified
viscosity. If no torsional vibrations occur during engine operation, the housing and the inertia
ring turn with the same speed, as the silicone oil transfers the torque. If torsional vibrations
occur during engine operation, the housing and the inertia ring dynamically turn at different
speeds. This difference shears the silicone oil and thus decreases the vibration.
The damping work causes heat. This heat increases the temperature of the outer side of the
damper. The heat dissipates to the ambient air in the crankcase. If installed, system oil is
sprayed on the damper to dissipate more heat. The oil drains into the crankcase.
If the viscous damper gets too much dynamic torque and thus causes too much heat, the
viscosity of the silicone oil can change. Then the damping effect can change. Thus do regularly
a check of the viscosity of the silicone oil, refer to the Maintenance Manual.
Fig 5-18 Viscous damper (generic)
001
001002 002
003
003 004
004
005
006
Legend
001 Cover 004 Inertia ring
002 Housing 005 Bearing
003 Sealing 006 Silicone oil
X92DF
AA00-3130-00AAA-043A-A
Operation Manual Torsional vibration damper
Winterthur Gas & Diesel Ltd.
- 180 - Issue 002 2020-08
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