What is a dynamic pressure sliding bearing?

Sliding bearings, bearings that work under sliding friction. It is characterized by stable, reliable and noise-free operation. In the following working conditions: 1 load weight 2 high precision 3 high speed 4 large size or special small 5 special structure (required bearing part) Sliding bearing is more advantageous than the rolling bearing. Therefore, sliding bearings are often used in steam turbines, centrifugal compressors, internal combustion engines, and large motors. In addition, low-speed and impacted machines (such as cement mixers, crushers, etc.) are also commonly used as plain bearings.

Sliding bearing structure

►Integral Radial Slide Bearing

Features: simple structure, low cost.

The gap between the journal and the bearing bore after wear cannot be adjusted; it can only be installed and disassembled in the axial direction

Applications: In machines with low speed, light load or intermittent operation.

► Split bearing

Features: easy to install the bearing, the gap can be adjusted, but the structure is complex.

Note: The angle between the vertical line and the radial force of part of the surface shall not be greater than 35°. Otherwise, the 45° inclined part is used.

► Thrust sliding bearing

Thrust sliding bearings consist of a bearing seat and a thrust journal. Commonly used journal structure:

Hollow type: The pressure distribution on the journal contact surface is even and the lubrication condition is better than the solid type.

Single ring type: The annular end surface of the journal is used as the thrust surface, which is simple in structure, easy to lubricate, can withstand dual-core, and widely used in low-speed and low-load applications.

Multi-ring type: The bearing capacity is large and it can withstand two-way axial load. However, the load distribution among the rings is not uniform.

Bearing structure

Bearings should have a certain strength and rigidity, to be fixed and reliable, good lubrication, heat dissipation, easy loading and unloading and adjustment. The bearing shell is fixed on the bearing seat. The surface of the bearing shell is often cast with a layer of anti-friction material to become the bearing lining. The thickness is from a few millimeters to six millimeters. In order to make the bearing lining secure, grooves can be made in the bearing bush.

►Forms and construction of bearings

Integral type: sleeve

Partial type:

1 thick-walled bearing: wall thickness/diameter>0.05

2 thin wall bearings: wall thickness / outside diameter

► Bearing positioning

The relative displacement of the bearing shell and the bearing housing is not allowed.

The fixed method can be used:

a. Both ends are flanged.

b. Set screws or pins.

c. Partially punch out the locating lip.

► Fitting of bearing shell and bearing seat