picture Back-Structured Shaft Seals

Research Project: Back-Structured Shaft Seals (B3S)

Institute of Machine Components (IMA)

Development and optimization of novel sleeve seal with back side structuring
[Photo: Lothar Hörl]

The project involves the further development of a novel sealing mechanism for PTFE and elastomer sleeve shaft seal. By structuring a sleeve on the back (indirectly), the stiffness of the sleeve is influenced. As a result, when the sleeve is mounted on the shaft, very fine return structures form automatically in the otherwise smooth sealing gap. On the one hand, excellent sealing is achieved through the return effect and, on the other hand, in the case of elastomer sleeves, it is possible to build up a separating air cushion between the shaft and the sleeve. First prototypes lifted off the shaft from a circumferential speed >17 m/s and were successfully tested up to 75 m/s with almost no friction and therefore without thermal damage.

The aim is to develop an elastomer sleeve seal for various applications that is easy to manufacture, statically and dynamically tight and runs without friction.

detailed project description (.pdf)


  1. Dakov, Nino: Elastohydrodynamische Simulation von Wellendichtungen am Beispiel der PTFE-Manschettendichtung mit Rückförderstrukturen. Stuttgart, Institut für Maschinenelemente, Dissertation Nr. 193, 2020. — IMA-DT 671
  2. Stoll, Mario: Entwicklung und Funktionsanalyse rückenstrukturierter Manschettendichtringe aus PTFE-Compound. Stuttgart, Institut für Maschinenelemente, Dissertation Nr. 192, 2019
  3. Stoll, Mario ; Dakov, Nino ; Hörl, Lothar ; Bauer, Frank: Functional Behaviour of Different Back Structures for PTFE Shaft Seals. In: International Sealing Conference : Fachverband Fluidtechnik im VDMA e.V., 2018. — ISBN 978-3-8163-0727-3, S. 105–118 — IMA-DT 648 (peer-review)
  4. Hörl, Lothar ; Stoll, Mario ; Dakov, Nino ; Bauer, Frank: A new approach how to achieve back pumping on PTFE lip seals. In: 73th STLE Annual Meeting : STLE, 2018 — IMA-DT 641
  5. Stoll, Mario ; Dakov, Nino ; Hörl, Lothar ; Bauer, Frank: A New Innovative Design for Shaft Seals. In: Fluid Sealing 2018 : BHR Group, 2018. — ISBN 978-1-85598-1638, S. 119–131 — IMA-DT 636 (peer-review)
  6. Dakov, Nino ; Stoll, Mario ; Hörl, Lothar ; Feldmeth, Simon ; Bauer, Frank: Multiscale Simulation of a Novel Lip Seal Design. In: Fluid Sealing 2018 : BHR Group, 2018. — ISBN 978-1-85598-1638, S. 161–185 — IMA-DT 638 (peer-review)
  7. Hörl, Lothar ; Dakov, Nino ; Stoll, Mario ; Bauer, Frank: Vorrichtung zur Abdichtung eines Gegenstands - Offenlegungsschrift DE 10 2016 124 457 A1, veröffentlicht 21.06.2018. — IMA-DT 645


This image shows Lothar Hörl

Lothar Hörl


Vice Head of Sealing Technology

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