Mounted Bearings: A Complete Guide to Structure, Selection, and Application
1. What is a Bearing Unit with Housing?
A bearing unit with housing is an integrated bearing unit that combines a rolling bearing and a bearing housing. It consists of a bearing seat with a base, containing a bearing installed in a housing. The housing is fixed onto the base, and then the shaft is inserted, allowing the internal parts to rotate.
The core value is that they are fully independent, pre-lubricated units that can be installed on equipment at any time, greatly simplifying the assembly process of mechanical equipment.
2. Structural Features of Bearing Units with Housing
Bearing units with housing use an integrated design of the bearing and the housing. The self-aligning models are fixed with a retaining ring and have automatic self-aligning capability, allowing them to accommodate shaft misalignment of up to 3 degrees.
Main components:
| Bearing Core | Usually an outer spherical ball bearing, with the outer race being processed into a spherical structure. |
|---|---|
| Bearing Seat | A support seat with a spherical inner hole, usually made from cast iron or cast steel, with some types also being stamped. |
| Sealing Device | A double-structure sealing device that effectively prevents dust and contaminants from entering and retains lubricating oil to enhance performance. |
| Fastening System | The bearing is fixed to the shaft through a set screw, eccentric sleeve, or tapered hole. |
3. Main Types of Bearing Units with Housing
3.1. Classification by Bearing Core Structure
| UC Type with Set Screw Outer Spherical Bearing | The bearing is fastened to the shaft with a set screw. |
|---|---|
| UK Type with Tapered Hole Outer Spherical Bearing | The bearing is fixed to the shaft using a tapered hole and a set sleeve. |
| UEL Type with Eccentric Sleeve Outer Spherical Bearing | The bearing is fixed to the shaft using an eccentric sleeve. |
3.2. Classification by Bearing Seat Shape
| Vertical Seat (P) | A common vertical mounting seat type. |
|---|---|
| Square Seat (F) | A square base that provides stable support. |
| Rhombic Seat (FL) | A rhombic design suitable for special installation spaces. |
| Circular Seat (FC) | A circular base structure. |
| Slide Block Seat (T) | Suitable for installation scenarios requiring sliding. |
4. Significant Advantages of Bearing Units with Housing
| Automatic Self-Aligning Feature | The outer ring of the bearing unit with housing adopts a spherical design and fits with a bearing seat that has a spherical inner hole, providing automatic self-aligning functionality to compensate for concentricity errors caused by processing errors or shaft deflection. |
|---|---|
| Easy Installation | The bearing unit can be mounted directly to the mechanical device’s body using a few bolts, significantly reducing installation time and skill requirements. |
| Excellent Sealing Performance | The double-structure sealing device works effectively in harsh environments, preventing contaminants from entering and retaining lubricants. |
| Strong Interchangeability | Bearing units with housing come in various structural forms and are highly interchangeable. The bearing core can be freely assembled into different shaped bearing seats of the same specification. |
| Convenient Maintenance | The bearing can be lubricated via grease through the lubrication nipple on the bearing seat, extending the bearing's service life. |
5. Applications of Bearing Units with Housing
Packaging Equipment: Provides precise shaft support and rotational accuracy; Conveying Systems: Bear the rotating load of conveyor shafts; Agricultural Equipment: Withstands harsh working environments, dust and contamination resistant; Construction Plants: Endure heavy loads and ensure stable equipment operation; Heat Treatment Equipment: Maintains stable performance under high-temperature conditions; New Energy Production Lines: For transmission mechanisms like cell peeling machines.
Bearing units with housing, as an integrated unit that combines rolling bearings with bearing seats, have become indispensable basic components in modern industrial equipment. These units are designed to securely install the bearing, allowing the outer ring to remain fixed while the inner ring rotates, and are fastened using bolts through holes in the base.
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