%0 Conference Paper %1 Frenzel.1994 %A Frenzel, Ulrich K. %A Müller, Heinz Konrad %B Proceedings of the 14th International Conference on Fluid Sealing %C London %D 1994 %E Halligan, B. %I Mechanical Engineering Publications %K from:thomasherzig dichtungstechnik H_Müller U_Frenzel from:brunomueller from:samuelschwamm ima %P 493–503 %T Hydraulic Rod Seals with laser-structured Back-Surface %X Optimum rod seals of hydraulic cylinders require effective wiping on the outstroke and, ideally, a complete inward pumping of the adhering film on the instroke. This is achieved by an asymmetric profile which creates a high maximum contact pressure gradient at the sealing edge on the fluid side and a corresponding low gradient near the outside end of the contact. In practice, however, by rising the fluid pressure inward-pumping diminishes which is due to a continuing increase of the maximum pressure gradient at the outside end of the seal contact. Based on the experience that a second circumferentially closed edge does not prevent the increase of leakage, the authors pursued the idea to support the back-surface with a large number of small asperities forming small interconnected gaps which boost inward pumping and reduce friction. Experimental results on the sealing capacity and friction of various back-surface structures are presented, and the design characteristics ofoptimum rod seals are discussed. %@ 0852989202

@inproceedings{Frenzel.1994, abstract = {Optimum rod seals of hydraulic cylinders require effective wiping on the outstroke and, ideally, a complete inward pumping of the adhering film on the instroke. This is achieved by an asymmetric profile which creates a high maximum contact pressure gradient at the sealing edge on the fluid side and a corresponding low gradient near the outside end of the contact. In practice, however, by rising the fluid pressure inward-pumping diminishes which is due to a continuing increase of the maximum pressure gradient at the outside end of the seal contact. Based on the experience that a second circumferentially closed edge does not prevent the increase of leakage, the authors pursued the idea to support the back-surface with a large number of small asperities forming small interconnected gaps which boost inward pumping and reduce friction. Experimental results on the sealing capacity and friction of various back-surface structures are presented, and the design characteristics ofoptimum rod seals are discussed.}, added-at = {2021-03-25T17:56:49.000+0100}, address = {London}, author = {Frenzel, Ulrich K. and Müller, Heinz Konrad}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/275e79085865d1627e67ed32805c58993/ima-publ}, booktitle = {Proceedings of the 14th International Conference on Fluid Sealing}, editor = {Halligan, B.}, eventdate = {6. - 8. April 1994}, eventtitle = {14th Int. Conference on Fluid Sealing}, interhash = {36340b53d493f067280fc67cc50e1a2d}, intrahash = {75e79085865d1627e67ed32805c58993}, isbn = {0852989202}, keywords = {from:thomasherzig dichtungstechnik H_Müller U_Frenzel from:brunomueller from:samuelschwamm ima}, note = 113, pages = {493–503}, publisher = {Mechanical Engineering Publications}, series = {BHR Group conference series}, timestamp = {2021-03-25T16:56:49.000+0100}, title = {Hydraulic Rod Seals with laser-structured Back-Surface}, venue = {Firenze, Italy}, year = 1994 }