Freudenberg-NOK Merkel has developed its new Merkel Radiamatic R 55 radial shaft sealing ring for rotary shafts that drive wind systems. The R 55 has been designed with an integrated deflector lip that protects wind turbine systems against harsh environment elements and eliminates the need to use a second seal – a common practice in existing wind systems.
The new seal reduces installation space and eliminates the expense associated with a second seal. At the same time, the seal does not require functional compromises. The Merkel Radiamatic R 55 can offset radial play or shaft eccentricity without neglecting its sealing and deflecting functions. This was both the crucial point of this new development and, simultaneously, its challenge.
In comparison tests, the Merkel Radiamatic R 55 demonstrates exemplary behaviour in shaft contact and prevention of leakage and wear. The deflecting and sealing lips always stay in contact with the shaft and provide protection. In addition, the sealing lip maintains linear contact in the event of positive shaft deflection, thus contributing to a long service life. Freudenberg-NOK engineers were also able to effectively counter the risk of increased wear due to vacuum formation between the sealing and the deflecting lips through the lip texture.