In the field of mechanical engineering, the design of the bearing seat is crucial, which is directly related to the stability and service life of the equipment. As two common bearing types, fixed pillow block bearings and floating sliding block bearings have significant differences in design purpose, performance characteristics and application scenarios.

Design purpose

The core of the design of fixed pillow block bearing is to provide accurate axial and radial positioning. This design ensures that the housing is tightly attached to the mechanical structure and is suitable for applications requiring high precision positioning. The fixed pillow block bearing ensures the stable connection between the bearing and the support structure through fasteners or interference fit, preventing displacement during operation, and is suitable for bearing heavy loads and maintaining the accurate operation of the machine.

Floating sliding block bearings are designed to accommodate the thermal expansion of the shaft or changes in length due to assembly errors. The floating design allows the bearing seat to have a certain range of movement in the axial direction, thereby compensating for the effect of thermal expansion and contraction and reducing internal stress. This design is particularly suitable for long-axis or multi-segment axis systems, where the thermal expansion of components can cause the distance between fixed points to change.

Application situation

fixed pillow block bearings are commonly found in:

- Precision machinery: such as CNC machine tools, precision instruments, need high precision positioning.

- Heavy duty equipment: such as large gearboxes, which require stable radial and axial support.

- High speed rotary applications: High speed motors and compressors require very low vibration and axial movement.

Floating slide bearings are suitable for:

- Long axis system: such as paper machine, large conveyor belt, long axis, obvious thermal expansion.

- Environments with large temperature changes: such as outdoor or high-temperature working machinery, need to compensate for the size change caused by temperature changes.