Volvo Engine Support, Flywheel Housing, Mounts
by Starlight Generator dieselgeneratortechEngine support
Volvo engines are designed for two flywheel housing supports and two front engine mounts. (TAD1650VE has three-point mounting)
• The rear mounts must absorb almost all the front and rear forces created when connecting a trailer, or exposed to shocks from loading docks. Practically no front or rear shock forces are absorbed by the front mount. The front mount must therefore be designed such that it is relatively free from shear in all horizontal directions, but stiff vertically.
• Concerning mounting system resonance, its natural frequency is the frequency at which the engine vibrates when it is struck by an external force. It is important to separate the natural frequency for front and rear axle installations compared to the engine.
• When selecting vibration insulation it should be understood that satisfactory insulation from existing resonance vibrations is not achieved until the natural resonance frequency is exceeded by > 1.41. In order to achieve good comfort at idle (frequencies from combustion, shaft forces) these forces should also be above this resonance frequency. Special consideration must also be given to resonance frequencies from forces that are transferred via the suspension system such as roll, pitch and yaw forces.
Front support
It is important to protect the engine from torsional forces emanating from the frame.
The following applies to systems with two front engine mounts:
• The centerline of the insulator must be located as close to the cylinder block as possible to minimize bending stress.
Rear support
The selection of the rear support
is crucial in that it must support the larger part of engine weight and absorb
most of the inertial load in all axes. Torque absorption, the absorption of
imbalances and angular forces in the drive train must in the first instance be
through the rear mounts. In the longitudinal axis a location immediately
outside the flywheel housing is recommended. If the engine mounts are supplied
by the customer, the distance between the center of the attachment to the SAE
housing may not exceed the distance for the equivalent engine mounts from Volvo
Penta accessories; refer to the illustration A. Where this is not possible in
individual cases, contact Volvo Penta, Sales Engineering Industrial.
End support
In combination with four engine
mounting points On certain large or heavy transmissions, end support is
installed on the transmission. The end support does not need to be stiff or
limit movement when it is exposed to frame bending. Support strength must be
changed for very low suspension speeds. Vertical and transverse stiffness of
approximately 15 % of the rear engine mounts is recommended.
Engine Mounting and Engine Room Layout
Engine Mountings
Correct mountings and couplings
to the load are essential for good results in all engine installations. The
type of mount depends on the type of installation the engine is to be used for
and the final transmission device. It is therefore important to note that when
the engine is installed to the driven unit/equipment the dynamic behavior will
be the sum of the entire installation's components. It is important to ensure
that critical engine rpm (the range within which the chosen engine has its
intended operations) for all installations are within limits.
Volvo Penta industrial engines
are installed in three fundamental application categories:
Mobile installations
Installations in this category move while they are in use. Examples of such installations are terrain-going trucks, heavy construction equipment and many specialist machines. The installed engine usually drives the machine as well as its auxiliary functions electrically, mechanically or hydraulically. In this category it is extremely important that alignment is maintained and that mobility rules are followed.
Stationary installations
Where fixed installations can be used they have several advantages. Some examples of this type of installation are stand-by power systems, ventilation fans and pumps etc. Fixed installations are advantageous thanks to the fact that they entail fewer mounting and structural problems than other categories. Conditions may however require noise and vibration insulation, which make engine mounting more complicated.
Semi-mobile installations
In these installations the
machine is moved occasionally, but the engine is not usually used as a source
of motive power for the machine, and nor is the engine usually run when the
machine is being moved. Examples of semi-mobile installations are stone
crushers, cement mixers, mobile air compressors and mobile irrigation devices
etc. There are several examples of machines within this category that move
while the engine is running, but only at low speed, such as certain cranes,
concrete layers or surface laying machines etc. Despite this category being
similar to fixed installations, a semi-mobile installation requires
consideration to be taken to other factors concerning power transfer. Mounting
is a deciding factor in minimizing machinery stress and the preservation of
correct alignment.
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Created on Jul 30th 2018 04:11. Viewed 233 times.