Koyo delivers mega bearing for tunnel excavating machine

A Roller Bearing is really an extraordinary piece of mechanical engineering. The smallest types have a diameter of no more than a few millimeters and are used in dentist drilling devices with maximum rotation speeds of more than 30.000 rpm, while the largest ones are used in tunnel drilling equipment and measure more than 7 meters in diameter, while rotating at no more than a few rpm's per day.

Linked is an article about one of Koyo's mega bearings for such an application.

http://www.bearing-news.com/delivers-77m-diameter-slewing-bearing-for-one-of-japans-largest-tunnel-excavation-shield-machines/

FAQ

Cos’è un cuscinetto assiale a sfere?

I cuscinetti assiali a sfere sono a singola o doppia direzione. Nel primo caso consentono di sopportare carichi in un’unica direzione, nel secondo in entrambe. In nessun caso sono adatti per carichi radiali o ad alta velocità. Sono tipicamente utilizzati nelle applicazioni automobilistiche, aeronautiche e marine.

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