Figure 17.2
Directives for generator end design (4V64F0003a)
17.2 Torque flange
In mecanical propulsion applications, a torque meter has to be installed in order to measure the absorbed
power. The torque flange has an installation length of 300 mm for all cylinder configurations and is installed
after the flexible coupling.
17.3 Clutch
In many installations the propeller shaft can be separated from the diesel engine using a clutch. The use
of multiple plate hydraulically actuated clutches built into the reduction gear is recommended.
A clutch is required when two or more engines are connected to the same driven machinery such as a re-
duction gear.
To permit maintenance of a stopped engine clutches must be installed in twin screw vessels which can
operate on one shaft line only.
17.4 Shaft locking device
To permit maintenance of a stopped engine clutches must be installed in twin screw vessels which can
operate on one shaft line only. A shaft locking device should also be fitted to be able to secure the propeller
shaft in position so that wind milling is avoided. This is necessary because even an open hydraulic clutch
can transmit some torque. Wind milling at a low propeller speed (<10 rpm) can due to poor lubrication
cause excessive wear of the bearings
The shaft locking device can be either a bracket and key or an easier to use brake disc with calipers. In
both cases a stiff and strong support to the ship’s construction must be provided.
Product Guide Wärtsilä 34DF - 3/2012
147
Product Guide
17. Power Transmission
