The following questions are more common. During engine combustion, the piston engine produces undesired crankshaft torsional vibrations that interfere with the operation of the entire powertrain. This is especially true for vehicles with diesel engines. This "harmful vibration" can even be quantified. The amplitude of the torsional vibration of the crankshaft is approximately 30%.
It is almost impossible to prevent this torsional vibration. And this vibration is inevitably transferred to the V-ribbed belt that drives the engine auxiliary device (such as the generator). As a result, the service life of the drive belt is shortened, and in the most extreme cases, the mileage of nearly 30,000 km is shortened.
Unacceptable noise, vibration and trouble can also occur. These problems do not only affect the driver's vehicle driving sense; they also bring costly warranty.
Another problem is that the torsional vibration of the crankshaft constantly accelerates or decelerates the belt drive and continuously accelerates or decelerates the connected auxiliary devices during operation. This can result in those auxiliary devices that are less sluggish, driven, such as generators, which consume a significant maximum load on the auxiliary drive. As a result, the belt is vibrated with a large noise and a large wear.
In this regard, a solution to this problem is to use the OAP that conducts motion only in a single direction of the belt, that is, the direction in which the shaft is driven. Through it, the generator can be quickly turned on in an instant when the engine is decelerating. Get out of the way.
“The application of the principle of overspeed is not new. Many people are familiar with the overspeed clutch on the rear wheel of the bicycle,†said Jorg Wagner, business unit manager at Schaeffler KG, a German automotive supplier.
To manufacture such parts, a higher level of precision is required. However, "for the successful production of our OAP product, the effective standardization design, and the higher level of reliability, are also important factors that cannot be ignored," Wagner said.
In Europe, about 80% of all diesel engine vehicles are equipped with OAP. Since Schaeffler began mass production of the product in 1995, the company has supplied the product to automakers, which has exceeded 500 in number. Ten thousand.
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