Vibracoustic GmbH: Overrunning damper isolator pulley reduces consumption and emissions by up to one percent

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DGAP-Media / 2017-10-26 / 15:51 
 
*Overrunning damper isolator pulley reduces consumption and emissions by up to 
one percent* 
 
Darmstadt, October 25, 2017. The efficient integration of auxiliaries in the 
belt drive is just as important as internal engine measures for the reduction 
of CO2 and consumption levels. Low belt tension can lead to significant 
improvements in efficiency here. However, this also involves the risk of belt 
sagging, which needs to be prevented at all cost. Vibracoustic has now 
developed a solution for this: the overrunning damper isolator pulley prevents 
sagging and flapping of the belt and thus ensures consistent belt tension in 
every driving situation. 
 
*Intelligent force management* 
Low capacity, often just three cylinders, very high peak pressures, and 
start-stop systems are typical features of modern downsizing engines. While 
the performance of these units has now reached a high level, maximum 
harmonization of the ensuing forces and vibrations on start-up of the engine 
presents a constructional challenge. During the very first second of engine 
start-up, huge forces need to be controlled at near-idle speeds. In addition 
to impacting on comfort, these disharmonies also cause high stress on the 
auxiliaries in the belt drive. 
 
*Low consumption, lower wear* 
Many manufacturers focus on reducing belt tension, as the reduced friction 
losses across all speed ranges can result in consumption and CO2 reductions of 
up to one percent. Vibracoustic initially designed an isolator pulley with an 
additional one-way clutch function for the three-cylinder engine of a large 
German automotive manufacturer, a solution which would later also be used for 
four-cylinder engines. This is generally suitable for all gasoline and diesel 
engines. 
 
*Optimal tension in every load state* 
The one-way clutch is closed during regular driving operation. However, in the 
case of any delay in the rotation of the crankshaft, the one-way clutch opens, 
enables motion, and prevents "re-turning" of the auxiliaries. The V-ribbed 
belt consequently remains adequately tensioned in each load state, even in the 
case of low pretension. The one-way clutch function enables the forces 
impacting on the belt on start-up of the engine to be significantly reduced. 
 
*Patented combination* 
The core components of the design include a metallic hub which is connected to 
the front of the crankshaft and accepts the flux of force. An elastomer spring 
enables the isolation function. A metallic outer ring is enclosed around this 
clutch, serving as the inner running surface of the one-way clutch. Two cage 
structures in which the clamping elements are connected ensure the secure 
positioning of the one-way clutch. The outer ring of the one-way clutch then 
represents the connection to the pulley, through which the V-ribbed belt for 
the auxiliary drive runs. There is no metallic connection between the one-way 
clutch and the crankshaft with this design. This patented combination from 
Vibracoustic offers considerable acoustic benefits for the entire system. 
 
*Potential for further applications* 
 
Variants of the system can be used for gasoline and diesel engines, while 
application in hybrid drive systems in various different vehicles classes is 
also possible. The overrunning damper isolator pulley can thus further improve 
the efficiency of hybrid vehicles. 
 
_Vibracoustic is the leading supplier of vibration technology solutions for 
the global automotive and commercial vehicle industries. The company which was 
created from the joint venture TrelleborgVibracoustic recorded a turnover of 
approximately 2 billion euros in 2016. With around 10,000 employees in 43 
locations across 19 countries, Vibracoustic develops and produces drive and 
chassis components which reduce vibration and noise. For more information, 
visit _www.vibracoustic.com [1] 
 
For further information, a high res image as well as a short animation of the 
operating principle please visit our media portal at 
https://www.vibracoustic.com/media/press-releases/2017/overrunning-damper-isol 
ator-pulley-reduces-consumption-and-emissions-one [2] 
 
*Press contact:* 
David Plaettner 
Senior Manager Corporate Communications 
Phone: [phone] 
Mobile: [phone] 
E-mail: *[e-mail]* 
 
End of Media Release 
 
Issuer: Vibracoustic GmbH 
Key word(s): Automobile 
 
2017-10-26 Dissemination of a Press Release, transmitted by DGAP - a service 
of EQS Group AG. 
The issuer is solely responsible for the content of this announcement. 
 
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623071 2017-10-26 
 
 
1: http://public-cockpit.eqs.com/cgi-bin/fncls.ssp?fn=redirect&url=eebeb45545403f84bcb5285e0aecc491&application_id=623071&site_id=vwd&application_name=news 
2: http://public-cockpit.eqs.com/cgi-bin/fncls.ssp?fn=redirect&url=0077caea2cdb209e317842847f0ddb70&application_id=623071&site_id=vwd&application_name=news 
 

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October 26, 2017 09:51 ET (13:51 GMT)