Dual mass flywheel
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project report tiger
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08-02-2010, 11:24 AM


The dual mass flywheel, or DMF, eliminates excessive transmission gear rattle, reduces gear change/shift effort, and increases fuel economy. There are two basic types of Dual Mass Flywheels. The first is made up of a primary and secondary flywheel with a series of torsion springs and cushions. There is a friction ring located between the inner and outer flywheel that allows the inner and outer flywheel to slip. This feature is designed to alleviate any damage to the transmission when torque loads exceed the vehicle rating of the transmission. The friction ring is the weak spot in the system and can wear out if excessive engine torque loads are applied through it. The system also has a center support bearing that carries the load between the inner and outer flywheel, and is fitted with damper springs to absorb shocks. The second type of DMF incorporates planetary gearing. It is designed for engines with stronger vibrations in the lower RPM range. As well as greater driving and shifting comfort, the planetary DMF provides the benefit of lower fuel consumption because the idling RPM is lower. Dual mass flywheels are fitted to light-duty diesel trucks with standard manual transmissions and, and to higher performance luxury vehicles to dampen vibration in the drive train. This also allows vehicles to be operated for longer periods without long term damage. Transmissions in light-duty diesel powered trucks have a heightened sensitivity to fluctuating tensional inputs. This results in a strong tensional resonance or vibration that occurs during operation of the vehicle within normal driving ranges. The function of the dual mass flywheels is to isolate torsion crankshaft spikes created by diesel engines with high compression ratios. By eliminating the torsion spikes, the system eliminates any potential damage to the transmission gear teeth. If the dual mass flywheel was not used, the tensional frequencies could damage to the transmission. The dual mass flywheel construction relocates the damper from the driven disc to the engine flywheel. This repositioning dampens engine tensional vibrations more than is possible with standard clutch disc dampening technology. Dual mass flywheels are designed to provide maximum isolation of the frequency below the engine's operating RPM, usually between 200-400 RPM. They are also most effective during engine startup and shutdown. and a A dual mass flywheel for a vehicle includes a primary flywheel connected to a crankshaft of an engine; a damper housing integrally formed in a circumferential direction of the primary flywheel; a secondary flywheel connected to an input shaft of a transmission and rotatable mounted on a hub of the primary flywheel; driven fingers integrally formed on the second flywheel and inserted vertically into the damper housing to be forced by the damper springs. The damper springs comprises two spring sets symmetrically disposed within the damper housing, one end of each damper springs being driven by the stoppers which are integrally formed on the primary flywheel, while the other end of spring sets drives the driven fingers of the secondary flywheel. The primary and second flywheels are integrally provided with project and implimentationions for preventing the damper springs from being excessively compressed and damaged. The damper springs comprises a plurality of springs, each having different spring coefficients and the damper springs are supported by a plurality of sliding guides or blocks.


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21-07-2011, 09:32 AM


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Dual mass flywheels
In modern light-diesel technology we are seeing much greater horsepower and torque gains sometimes coupled to better fuel economy. Dual Mass Flywheels have been used in many light-duty diesel trucks since 1987 that are fitted with a standard manual transmissions . Along with their continued use in such applications, DMFs are now also being fitted to high performance vehicles such as BMW’s and other similar luxury vehicles their primary purpose being to provide a vibration dampening action in the drive train.
The benefits of Dual Mass Flywheels
• To eliminate excessive transmission gear rattle, making driving comfortable at any speed,
• reduce gear change/shift effort, and
• increase fuel economy.
Why is a Dual Mass Flywheel needed?
Transmissions in light duty trucks diesel powered vehicles have a by default a heightened sensitivity to fluctuating torsional inputs. This results in a strong torsional resonance or vibration that occurs during operation of the vehicle within normal driving ranges.
By providing a vibration dampening action that is superior to the normal dampening actions in a normal clutch arrangement the vehicle can be operated for longer periods without long term damage.
The dual mass flywheel construction relocates the damper from the driven disc to the engine flywheel. This repositioning dampens engine torsional vibrations more than is possible with standard clutch disc dampening technology.
Function and Operation
The function of the Dual Mass Flywheels or DMF is to isolate torsion crankshaft spikes created by diesel engines with high compression ratios. By eliminating the torsion spikes, the system eliminates any potential damage to the transmission gear teeth. If the DMF was not used the torsional frequencies could damage to the transmission.
DMFs are designed to provide maximum isolation of the frequency below the engine’s operating RPM, usually between 200-400 RPM. The time that the DMF works hardest is during engine startup and shutdown.
Construction
There are two basic types of DMF The first type of dual mass flywheel, or DMF as it is more commonly known, is made up of a primary and secondary flywheel with a series of torsion springs and cushions.
There is a friction ring located between the inner and outer flywheel that allows the inner and outer flywheel to slip.
This feature is designed to alleviate any damage to the transmission when torque loads exceed the vehicle rating of the transmission. The friction ring is the weak spot in the system and can wear out if excessive engine torque loads are applied through it.
The system also has a center support bearing that carries the load between the inner and outer flywheel.
The system is also fitted with damper springs to absorb shocks.
The second is designed with planetary gearing (planetary DMF) is designed especially for engines with stronger vibrations in the lower rpm range. Although these are primarily diesel engines, this type of DMF provides a smooth engine output comparable to that of gasoline engines.
This type provides in addition to greater driving and shifting comfort, benefits for drivers include lower fuel consumption because the idling rpm is lower.
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