07 Fakultät Konstruktions-, Produktions- und Fahrzeugtechnik
Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/8
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Item Open Access Influence of protection lips on the frictional torque of rotary shaft seals(2024) Olbrich, Christoph; Feldmeth, Simon; Bauer, FrankRotary shaft seals are used to seal rotating machine parts. In most cases one single sealing lip (main lip) contacts the shaft and separates the fluid on one side from the environment on the other side. To prevent the entry of other fluids and or particles, seals with additional protection lips are used (two lips), especially in heavily contaminated environments. When the protection lip contacts the shaft, a vacuum can form between the main lip and the protection lip, leading to increased contact pressure and friction. The increased frictional torque generates more heat and leads to overheating in the contact area between the lip and the shaft. Test runs conducted on a friction torque test bench with various seal configurations confirm that the two lips influence each other. Higher frictional torques and contact temperatures occur, when the volume between the lips isn't vented. This shows the importance of venting.Item Open Access Abschätzverfahren für die Kontakttemperatur bei Radial-Wellendichtungen(2016) Feldmeth, Simon; Bauer, Frank; Haas, WernerItem Open Access Computational fluid dynamics of the lubricant flow in the sealing gap of rotary shaft seals(2022) Grün, Jeremias; Feldmeth, Simon; Bauer, FrankThe lubricant flow in the sealing gap significantly affects the sealing behavior of rotary shaft seals. Computational fluid dynamics (CFD) are applied here to analyze these fluid flows. A decisive input parameter is the sealing gap height respectively the lubricant film thickness. The film thickness is estimated on the basis of several analytical elastohydrodynamic lubrication (EHL) equations. The results for sealing characteristics such as the pumping rate and the friction torque derived from the numerical analyses are compared and discussed with the results obtained from test rig studies. This allows the validity of the applied methods to be verified.Item Open Access Simulation of the fluid flow in the sealing gap of radial lip seals(2014) Feldmeth, Simon; Bauer, Frank; Haas, WernerItem Open Access Using multiphase conjugate heat transfer analyses to predict the contact temperature of rotary shaft seals(2024) Hannss, Jacqueline; Grün, Jeremias; Olbrich, Christoph; Feldmeth, Simon; Bauer, FrankRotary shaft seals are used to seal shaft passages and prevent the exchange of fluids. The performance and service life of rotary shaft seals is strongly dependent on the temperature in the contact area between the sealing edge and the rotating shaft. Multiphase conjugate heat-transfer analyses covering different assembly scenarios, for example additional bearings or different shaft geometries, were performed in the software Ansys CFX 2021 R2. A model for predicting the maximum temperature in the sealing contact and for determining the heat dissipation from the sealing contact to the surrounding geometry was developed. This model provides the ability to predict the influence of the design of the surrounding sealing system on the contact temperature. Thus, the surrounding geometry of rotary shaft seals can be optimally designed to reduce the contact temperature between the sealing ring and the shaft as much as possible in order to achieve a longer service life.