Understanding Bearing Types

Which of the following bearing types must be continuously lubricated by pressure oil?

A. Hydrostatic bearings

B. Rolling-element bearings

C. Hydrodynamic bearings

D. Magnetic bearings

Final answer:

Hydrodynamic bearings must be continuously lubricated by pressure oil to reduce friction and wear.

Hydrodynamic bearings are a type of bearing that relies on a thin film of oil to separate the rotating shaft from the bearing surface. This oil film is essential for reducing friction and wear between the moving parts of the bearing. In order to maintain this oil film, hydrodynamic bearings require continuous lubrication with pressure oil.

Pressure oil is supplied to the bearing through a pump or lubrication system, ensuring that the oil film is maintained even under high rotational speeds. This continuous lubrication helps prevent metal-to-metal contact between the shaft and the bearing, which can lead to premature wear and failure of the bearing.

Hydrodynamic bearings are commonly used in high-speed applications such as turbines, engines, and other machinery where reducing friction and wear is critical for efficient operation. By understanding the importance of pressure oil lubrication in hydrodynamic bearings, engineers and maintenance professionals can ensure the reliability and longevity of these essential components.