Freudenberg supplies 10m diameter primary seals

ERJ staff report (DS)

Weinheim, Germany -- Freudenberg Dichtungs- und Schwingungstechnik GmbH & Co. KG (FDS) has supplied large diameter seals to protect the bearings on tunnel boring machines used in China.

Shield excavation tunnel boring machines are used in complex tunnel projects around the world. The main bearing is the heart of these massive machines. These multiple-row roller bearings, which measure up to 6 m in diameter and weigh up to 20 t, hold the rotating cutter and support it against the enormous advance forces and massive torque that are typical of such applications.

The main bearing is protected against the penetration of excavated material, stone, sand, and water by special shaft seals. At the same time, these seals prevent transmission oil leakage. These large seals, which were developed by Merkel Freudenberg, are manufactured as endless moulded rings without joints, can measure up to 10 m in diameter, and are produced within the narrowest of tolerances.

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Press release from Freudenberg