What is the importance of the main bearing?

The main bearing is an important component of the steam turbine, and the main bearing is also called a radial bearing. Its function is to bear the full weight of the rotor and the centrifugal force due to the imbalance of the rotor mass, to determine the correct radial position of the rotor in the cylinder. Since each bearing has to bear a high load and the journal rotates at a high speed, the bearings of the steam turbine adopt the bearing pad type sliding bearing based on the theory of liquid friction. An oil film is formed between them, and liquid friction is established, so that the steam turbine can run safely and stably.

• How to choose main bearing?

• How to lubricate the main bearing?

• What is the importance of main bearing?

How to choose main bearing?

When selecting the main bearing, the type, combination and configuration of the bearing should be selected according to the requirements of the main shaft components in terms of rotational accuracy, stiffness, bearing capacity and rotational speed. At the same time, factors such as bearing supply and economy should also be considered. Spindle bearings can be divided into two categories: rolling bearings and sliding bearings.

In general, the main shaft should use rolling bearings as much as possible, especially the vertical main shaft, which can be lubricated with grease to avoid oil leakage. Sliding bearings are only used when the roughness of the machined surface is required to be small and the spindle is arranged horizontally. The vibration resistance of the main shaft component is mainly determined by the front bearing. Therefore, there are also sliding bearings for the front support of the main shaft, and rolling bearings for the rear support and thrust bearing.

How to lubricate the main bearing?

In terms of lubrication method, if the main bearing adopts pressure lubrication, almost all the main shafts rely on pressure lubrication. Due to the different working methods, the main bearing often adopts a combination of pressure and splash lubrication. The space between the cylinder wall and the piston on the car is almost entirely splash lubricated. Only in some large marine internal combustion engines with low speed, the pressure lubrication method with oil passages is used.

What is the importance of main bearing?

As a key part of the machine tool, the performance of the spindle will directly affect the parameters such as the rotation accuracy, speed, rigidity, temperature rise and noise of the machine tool, which in turn will affect the processing quality of the workpiece, such as the dimensional accuracy of the parts, surface roughness and other indicators. Therefore, in order to maintain excellent machine tool processing capability, high-performance bearings must be used. The bearing accuracy used on the machine tool spindle should be ISOP5 or above (P5 or P4 is the ISO accuracy grade, usually P0, P6, P5, P4, P2 from low to high), while for CNC machine tools, machining centers and other high-speed, For the spindle support of high-precision machine tools, the accuracy of ISOP4 or above should be selected; spindle bearings include angular contact ball bearings, tapered roller bearings, and cylindrical roller bearings.

LYXQL Slewing Bearing Co., Ltd. always focuses on customers’ needs and therefore it will provide the best main bearings for all customers from all over the world. If you want to know more, please connect them.