Online PDF Scania OC16 Industrial engine PDF Installation Manual
The type of engine suspension that is appropriate varies for different engine installations. In general, the following applies:
-The engine suspension should be designed for the forces it is exposed to, both continuously and momentarily during operation. Such forces are reaction forces from the transmitted torque and in some cases longitudinal acceleration, retardation and reaction forces in the engine.
-Both the engine suspension and the engine bed should be designed so that there are no resonant oscillations within the engine speed range. They should also be designed so that annoying vibrations from the engine are not transmitted to the surroundings.
-The engine bed location and the engine suspension must be designed so that the permissible angles of inclination for the engine are not exceeded. See the table in the Permissible installation and operating angles section.
- The engine suspension and engine bed should be designed in a way which allows access for maintenance and repairs.
There are two standard engine suspension designs:
- flexible engine suspension
- rigid engine suspension.
Table Of Contents
Engine suspension. .....3
Design requirements. .... 3
Flexible engine suspension. ....... 4
Rigid engine suspension. .. 5
Permissible installation and operating angles . ....... 6
Flywheel housings. 7
Generator set dynamics . ... 8
Lifting the engine . . 8
Accessibility for maintenance and repairs . ......9
Installation requirements. . 9
Clearances . . 11
Engine alignment. ....12
Flexible coupling. 12
Aligning engine and shafts. ..... 13
Power transmission . 18
Flexible coupling. 18
Friction clutch . .... 18
Transmission types. .20
Mechanical transmissions . ...... 20
Belt transmissions . ..... 20
Power take-offs . .......22
Front-mounted power take-offs. ...... 22
Side-mounted power take-offs . 25
Air compressor . .......31
Torsional oscillations. .....32
Data for torsional oscillation calculation . .... 33
Torsional oscillation calculations from Scania. .... 34
General tightening torques for screw joints . . 35
Specification of normal tightening torques. .. 35
Tightening torques. ..... 36
Sticker “Powered by Scania”. .... 39
Rigid engine suspension
A rigid engine suspension can absorb greater forces in all directions than flexible engine suspension. It requires highly accurate alignment of the engine in relation to the driven unit. On the other hand, it requires no special flexibility in the hoses, pipes and controls connected to the engine.
A rigid engine suspension can be used in engine installations where vibration causes no significant problems and where other characteristics make it desirable.
Even with a rigid engine suspension, the transmission of vibration to the engine bed can be kept low if the masses of the engine bed and connected parts are large in relation to the mass of the engine.
It is also possible to construct flexible engine suspension between the frame and the engine bed to reduce the transmission of vibration to the engine bed.
Permissible installation and operating angles
Maximum installation angle means maximum permissible installation angle for an engine relative to the horizontal plane. The angle indicates the limit for engine inclination during continuous operation.
Maximum operating angle means maximum permissible angle of inclination for an engine in operation and with minimum oil level. The angle may only be used for short periods. The given maximum forward or rearward operating angles are not applicable to their full extent if the engine is inclined laterally at the same time.
Silumin housings are supplied as standard on all industrial engines. The maximum permissible bending torque for a silumin housing is 10,000 Nm. This presumes that there are no axial loads from, for example, the propeller shaft, abnormal G forces or vibration.
For certain engine types, it is also possible to select a nodular iron flywheel housing. Nodular iron housings can dampen vibrations at certain engine speeds but increase vibrations at other engine speeds. Nodular iron is stronger than silumin and can therefore tolerate greater bending and torsional forces.
The stronger nodular iron housings are recommended in installations where transport causes serious stress on the flywheel housing, such as in dumper type trucks and generator sets with high outputs.
If it is difficult to determine the size and nature of the load, contact your nearest Sca-nia distributor.