Hydrodynamic bearings are mainly used in submersible pump devices and motor protectors. Hydrodynamic bearings are divided into hydrodynamic radial bearings and hydrodynamic thrust bearings. The bearings mainly bear axial loads and can also bear certain impact loads. The speed of the bearing varies with the current frequency.
Tilting-pad journal bearing
A tilting-pad journal bearing, one kind of hydrodynamic bearing/fluid bearing, is mainly under radial load and able to bear a certain impact load and unbalanced load. Generally, there are more than 3 pads on a tilting-pad journal bearing, which are evenly distributed on the base. Mostly, it is designed with odd number of pads. The load direction may be either vertical to the pad center or to the space between two pads. The position of the pad supporting point may be adjusted with load and direction of rotation. When the supporting point is at the pad center, the bearing may be bidirectionally rotated but the bearing capacity is lower than that of unidirectionally rotating bearing. If the pad width approaches the shaft diameter, the bearing is under the highest load.
Tilting-pad thrust bearing
A tilting-pad thrust bearing is mainly under an axial load but may be under a certain impact load. In general, a tilting-pad thrust bearing is designed with even number of pads, which are equally spaced on the base. The pad may be slightly swung about one supporting point. And, the inclination may be automatically adjusted with load and direction of rotation. It may be applicable to a wide range of speed, load and viscosity.
Fixed-pad thrust bearing
For fixed-pad thrust bearings, the pad is fixed onto the substrate. With micro deformation, oil wedge is formed to generate dynamic pressure. To consider the heat dissipation due to friction, a pair of complete friction faces is divided into several pads circumferentially. This structure of fixed pad is integrated with the substrate, made of ZYTCu-lO. Based on QSn1O-1, the ZYTCu-lO material may improve the PV value, resistance to bonding and wear, and bearing resistance.
The main alloy elements include Cu, Nu, Sn, Pb, Zn, P, etc. This material features good resistance to wear, long life of fatigue, good speed performance, not easy to be seized.
Tilting-pad thrust-journal bearing
A tilting-pad thrust-journal bearing may be under both radial load and axial load and able to axially and radially form a layer of stable hydrodynamic film of lubricating oil. It features comprehensive performance of a tilting-pad journal bearing and a tilting-pad thrust bearing. The material of pad is Babbitt aIoy, 3-layer composite material, etc.
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