AGMA 13FTM17

Industrial gear units are widely used in power transmissionsystems. They are composed of shafts, gears, rolling elementsbearings and dynamic lip seals. The seals performance is criticalfor a proper functioning of the system. Water or contaminationingress into a mechanical system may lead to a premature failure.Leakage of oil may have the same effect and be harmful for theenvironment. Depending on the application, seals may need tooperate under various dynamic conditions, such as wide range ofrotational speed (RPM) and temperatures, shaft-to-bore-misalignment(STBM), shaft dynamic run-out (DRO) or global structuredeformations. The prediction of dynamic seal performance is acomplex task. The rotating lip seals are usually made inelastomeric materials which display a hyper-elastic andviscoelastic behavior. Combined with the dynamic operatingconditions, the simulation of the seal performance requires timedependent approaches which are very often time consuming.Innovative modeling methods need to be developed in order to beusable by the development engineering community. This paperpresents a novel approach to predict seal dynamic performance underdynamic conditions. A formulation of viscoelastic super-elements isdeveloped to predict the deformations of the seal lips. It iscombined with a contact solver to assess contact force and itsdistribution around the shaft and other lip contersurfaces (such asother radial or axial locations). In order to demonstratefunctionalities and advantages of the developed method, pleaseconsider an example of radial lip shaft seal. The problem addressesprediction of seal performance at cold temperature, largeshaft-to-bore misalignment and dynamic run-out conditions.Different material and spring options are assessed in order toimprove the performance. This unique modeling capability will allowselecting or developing the shaft seals which would meet and exceedmodern gearbox demanding application. It will also enable gearboxmanufacturers to bring to the market more performing and reliablegearboxes.

Edition:

13

Published:

09/01/2013

Number of Pages:

10

File Size:

1 file , 890 KB