AXIAL SEALS
2Pages

Axial Seals AXIAL SEALS In combination with radial shaft seal rings, VRM axial seals of the product brand Dichtomatik are an outstanding sealing system for diverse applications in powertrain technologies and machine-building. Axial seals, which are upstream elements, protect housing interiors from dirt, dust and splash water. Each axial seal consists of a coated metal ring and an elastomer sealing element. If desired, the metal ring is also available in stainless steel. Depending on the requirements a standard version (VRM 01) and a special variation with an extended metal ring (VRM 02) can be offered. The seal is spread onto the metal ring but is not firmly bound to it. An axial rim collar helps to hold the ring in place. Thanks to its centrifugal effect, the metal ring supports the sealing function and protects the elastomer sealing element from external mechanical effects. As the circumferential speed increases, the elastomer sealing element, animated by the centrifugal force, tends to move outward, reducing the contact pressure. If circumferential speed exceeds a limit, the sealing lip detaches from the metallic undersurface. The axial seal then merely functions as a gap seal and a thrower ring. In addition to the standard version VRM 01, the VRM 02 offers an additional labyrinth effect. To ensure that the extended metal ring moves in the groove, a circumferential groove is provided. The resulting labyrinth in the housing groove works as a shield, protecting against impurities. For this reason, the VRM 02 is used in demanding applications with increased contamination from the exterior. DIMENSIONS The currently available dimensions can be found on our website dichtomatik.fst.com or on our online ordering platform EASY. APPLICATIONS Axial seals are primarily used in powertrain technologies and machine-building. Typical areas of application: • Electric motors • Gearboxes • Pumps • Power saws • Cardan shafts • Wheel hubs and axles • Agricultural machinery • Construction machinery • Machine tools • Roller bearing housings • Washing machines CHARACTERISTICS Sealing materials and media resistance Axial seals made of NBR (acrylonitrile butadiene rubber) and FKM (fluoro rubber) exhibit good chemical resistance to petroleum oils and greases. FKM is also highly resistant to synthetic oils and greases. Requirements for the counter-surface The VRM axial seal runs against a counter-surface arranged at a right angle to the shaft. For example, it can be the flange cover or the end wall of a bearing housing. The metallic bottom of a radial shaft seal ring is often used as a counter-surface as well. The requirements for the counter-surface are less stringent than those for radial shaft seal rings. They should have a finely processed surface, with a maximum Ra of 2 pm. FREUDENBERC INNOVATING TOGETHER

Axial Seals Components made with injection-molded or cast light metal alloys as well as formed steel sheet metal can function as counter-surfaces without additional processing. But the material must not have surface deformations or flaws, such as sharp edges, burrs, shrinkage cavities, undulations, bumps or other imperfections. Requirements for the shaft To guarantee the required press-fit and a secure seat on the shaft, the shaft must be produced with a tolerance of ISO H9. An additional axial fixation is not required. In the event of roller bearings, the current ISO G6 or N6 tolerance can...