What is bearing and seals?

The correct bearing and seal selection is crucial for every operation that calls for a system with moving or rotating parts.

Bearings are important because they reduce friction and distribute the force of axial and rotary loads, preventing a systemic collapse in different mechanical and non-mechanical applications that rely on rotation and linear motion. On the other hand, seals ensure that the lubricant stays where it belongs in the bearing and keeps contaminants out.

Ball bearing around the axis of an electrical motor – illustrative image. Credit: PIRO4D via Pixabay, free license

123bearing.com has been the go-to for all bearings and seals for several years. More details on the operation and function of various bearing and seal types are provided below.

Various Anti-Friction Bearing Designs

Ball bearings and roller bearings are the two most common kinds of low-friction bearings. A roller bearing consists of two rings, each with a pair of sliders that glide down a track between the rings. Ball bearings, which are solid spheres capable of rapid rotation, are reserved for processes demanding moderate to high loads, such as those found in pumps and compressors of all sizes. Shaft size can be anything from 2mm and 150mm.

Despite having the same sizes as ball bearings, roller bearings are more resistant to radial loads because of the increased contact area between the rolling parts. Here are the various types of roller bearings:

Symmetrical and Asymmetrical Barrel Rollers

Barrel rollers may be symmetrical, meaning they have the same form on both sides, or asymmetrical, meaning they are not identical in shape.

Cylindrical Rollers

The load is spread more evenly over a larger area with cylindrical rollers because of the big contact area between the rollers and the outer rings.

Tapered Rollers

Rollers with a taper are thinner at their tips yet have a unique profile generally.

Needle Rollers

Needle rollers are much like their cylindrical counterparts but are more extended and broader.

Different Types of Seals

Seals are required to preserve and allow for the operation of your selected bearings. There are many possible sealing designs, and choosing the right one is crucial. Finding the proper bearing seal requires careful analysis of many parameters, the most important of which is the bearing type.

Gaps Seals

The controlled gap seal is utilised to seal the space between the moving and stationary parts of the centrifugal pump. The size and form of the opening are selected to restrict the volume of material that can go through it.

Rubbing Seals

The efficiency of a rubbing seal is mainly dependent on the material’s elastic properties pressing against the sealing surface and keeping that stress constant. The outer speed determines the kind of seal to use and the minimum condition of the sealing surface.

Non-rubbing Seals

The key to performing non-rubbing seals is the minimal gaps, either positioned axially, radially or a combination of these. Low friction and wear make this seal durable; therefore, it is best for extreme speeds and temperatures.

Labyrinth seals

Labyrinth seals are designed to minimise contamination entry by generating regions of turbulent flow that push out particles that can pass through the seal’s narrow openings. Standard lip seals, which touch the shaft and rub the surface during operation, are replaced by these systems due to their perfect particle restriction and reduced lubricant leaks. 

Choosing the Best Bearings and Seals

Depending on their specific design, certain bearings can only be utilised in particular applications. Popular types, like roller bearings, ball bearings, and tapered thrust bearings, will have specialised seals. Similarly, the choice will be influenced by the lubricant you want to use. While some seals function well in oil, others do better in grease.

In Summary

When you are looking for bearings or seals, there are many options. However, you should always consult your reliable local provider for help and direction if you are in the market for bearing seals but are confused about which kind to choose.