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ZYS Tilting bearing
Feb 11, 2018

ZYS Tilting bearing is a kind of hydrodynamic bearing in sliding bearing, consisting of a number of independent tiles capable of swinging around the support. According to the bearing direction, it can be divided into tilting pad radial bearing and tilting pad thrust bearing.
Working principle

When the bearing is working, the bearing oil wedge is formed between the bearing surface and the journal surface with the help of the hydrodynamic pressure of the lubricating oil film, which makes the two surfaces completely separate from contact.

The ratio of oil film thickness 1 and 2 at the inlet and outlet of the wedge is called the clearance ratio, which is the main parameter affecting the bearing capacity of the tile.

The clearance ratio corresponding to the maximum bearing capacity is called the optimal clearance ratio, and its value varies with tile width B(axial dimensions of tiles) and tile length L, which varies from 2 to 3. The position of the tile support should be deviated to the outlet of the oil wedge, and its value is determined by the clearance ratio. When the clearance ratio is 2.2, the oil inlet edge from the support to the tile is about 0.58L.

With the change of bearing working condition, both the bearing surface inclination and the oil film thickness will change, but the clearance ratio will not change. This is where the tilting pad bearing is superior to other forming surface multi-oil wedge bearings.

Bearing capacity

The bearing capacity of tilting pad radial bearing is the vector sum of the bearing capacity of each tile block. Therefore, its bearing capacity is lower than single oil wedge liquid hydrodynamic radial bearing, but it has high rotary precision and good stability, so it is widely used in machinery with high speed and light load, such as steam turbines and grinders. The number of tiles is generally 3-6.