Gas turbine bearings
are composed of three parts. One part supports the rotor, while the other supports the compressor. A stepped cylindrical casting surrounds the bearing housing and the auxiliary gearbox. The outer raceway of the bearing supports the turbine rotor while the inner raceway prevents relative axial movement. The bearing is secured within a concentric bushing 3 and a casing 4, which are nonrotatably attached to the gas turbine's housing. The other component of the bearing is a closed member 18, which serves as the backplate for the diffuser and compressor. Oil is supplied into the annular space through extension 8A of the bearing oil supply drilling.
The cavity 5 of a gas turbine bearing can help cool the bearing. It also serves as a damping device for the rotor. This allows the rotor to operate silently. In addition to cooling the bearing, the cavity also acts as a compression film damping device. This means that there is no need for additional auxiliary equipment for damping the bearing.
Another important component of a gas turbine is the lubrication system. These systems must be efficient and have an efficient lubricant oil system. Designing a lubrication system for gas turbines requires thermal-hydraulic analysis and the design of many heat exchangers.
The bearings that support the gas turbine shaft require lubrication to keep them working at optimum efficiency. Proper lubrication will minimize the friction in the gas turbine, making it more efficient.