Description
Types of Bearings
Ball Bearings
Ball Bearings are probably one of the most common types of bearings that are useful for different purposes. These types of bearings are found in applications where there is less load hence this type of bearing can handle radial and thrust load having the wide range of operating speeds. Ball bearings are pretty much versatile in nature. The sub types also covered under ball bearing like Deep Groove Ball Bearing, Radial Contact Ball bearing, Angular contact Ball Bearing, Single Row and Double row ball bearing.
Deep Groove Ball Bearing :
Deep groove ball bearings are the most widely used bearing type and are particularly versatile. They have low friction and are optimized for low noise and low vibration which enables high rotational speeds
- Plain Ball Bearing – Although the name itself sounds quite vague, these are smooth, solid surfaces that move across each other.
- Single Z Ball Bearing – Bearings are shield by Steel / Metal seal only one side.
- ZZ Ball Bearing – Bearings are shield by Steel / Metal seal both the sides.
- RS Ball bearing – Bearings are shield by rubber seal on only side.
- 2RS Ball Bearing – Bearings are shield by rubber seal on both the sides.
- Double Row Angular Ball Bearing – Double row angular contact ball bearings corresponds to two single row angular contact ball bearings arranged back-to-back.
- Self-aligning ball bearings – Self-aligning ball bearings have two rows of balls, a common sphered raceway in the outer ring and two deep uninterrupted raceway grooves in the inner ring. They are available open or sealed. The bearings are insensitive to angular misalignment of the shaft relative to the housing.
- J Cage Bearing – Bearing having a steel, sheet, strip or wire form, centered by rolling elements.
- M Cage Bearing – Bearing having a bronze or brass, not in sheet, strip or wire form, centered by rolling elements.
Angular Contact Ball Bearing
Angular contact ball bearings have inner and outer ring raceways that are displaced relative to each other in the direction of the bearing axis. This means that these bearings are designed to accommodate combined loads, i.e. simultaneously acting radial and axial loads.
Linear Motion Bearing
A linear-motion bearing or linear slide is a bearing designed to provide free motion in one direction.
Cylindrical Roller Bearings
Cylindrical Roller Bearings are made to hold heavy radial loads, they are usually used in applications like conveyor belt rollers, etc. In this case, the bearing has a roller that is cylinder hence the point of contact is a line. This helps to spread the load over the larger area that allows the bearing to handle greater loads in comparison to a ball bearing. Cylindrical bearings are made with the single row, two rows or multi-rows of rolling elements that help to meet an application’s radial load requirement.
- Single Row Cylindrical Roller Bearing : Single row cylindrical roller bearing, which has rollers with cage that are guided on one of the bearing rings.
- Double Row Cylindrical Roller Bearing : Double row cylindrical bearings are designed for additional strength in carrying radial loads.
Tapered Roller Bearings
Tapered Roller Bearings are common in industrial applications, the tapered rollers in the bearings allow it to accommodate heavy radial, axial and combination loads. The bearing configuration and its flexible loading capability are designed from single cups, double cups, and cones. Hence, they are used in almost every industry use.
The standard tapered roller bearings have a “pin-type” design that makes it versatile to be used in the variety of applications. It is most commonly used in applications having very high loads and high speeds.
- Single Row Tapered Roller Bearing : Single row tapered roller bearings have one row of rollers which sit between a tapered inner and outer raceway.
- Double / two row tapered roller bearing : These bearings can accommodate heavy radial loads, axial loads in both directions and have a high degree of stiffness.
- Four-row bearing tapered roller bearing : Four-row tapered roller bearings can accommodate combined (radial and axial) loads at low to moderate speeds. They are used almost exclusively in work roll applications such as rolling mills.
Spherical Roller Bearings
Spherical Roller Bearings are rolling element bearings that helps rotation with low friction and it also allows angular misalignment too. The misalignment is permitted due to the spherical internal shape of the outer ring and spherical rollers. Spherical roller bearings support rotating shaft into the bore of an inner ring that could be misaligned as compared to the outer ring.
As their name represents, they are NOT truly spherical in shape, the rolling elements in roller bearings are more cylindrical in shape, slightly over-inflated. Spherical roller bearings are used in varieties of industrial applications that have heavy loads and moderate speeds. Most common applications are wind turbines, gearboxes, pumps, mechanical fans, construction equipment, marine propulsions, off-roading vehicles, etc.
- Single row Spherical Roller bearing : Single Row Spherical Roller Bearings that are suitable to reduce friction of a rotating surface.
- Double row Spherical Roller bearing : Double-row spherical roller bearings are suitable for large radial loads. They can also take some axial loads in either direction.
Thrust Bearings
Thrust bearings are a type of rotary bearings, they allow rotation between the parts and are so designed to support high axial load while being parallel to the shaft. Different thrust bearings are used for supporting different amounts of axial loads.
The ball thrust series can relatively handle lighter loads while the Angular contact series can handle the load from both radial and thrust loads in both directions. There are several designs and configurations available in thrust bearings depending on the industry type and applications for they are used.
Types of Thrust Bearings are: Ball Thrust bearings, Ball Angular contact, Double Acting Angular Contact, Cylindrical Roller, Crane Hook Cylindrical Roller, Light Duty Double Acting Cylindrical, and Center Plate Double Acting Cylindrical, Spool type Double Acting Cylindrical, Tapered Roller, V-Flat Tapered Roller, Double Acting V-Flat Tapered Roller, and Screwdown Thrust Tapered Roller.
Niddle Roller Bearing
A needle roller bearing is a special type of roller bearing which uses long, thin cylindrical rollers resembling needles. Ordinary roller bearings’ rollers are only slightly longer than their diameter, but needle bearings typically have rollers that are at least four times longer than their diameter.
Needle bearings are heavily used in automobile components such as rocker arm pivots, pumps, compressors, and transmissions. The driveshaft of a rear-wheel drive vehicle typically has at least eight needle bearings (four in each U joint) and often more if it is particularly long, or operates on steep slopes.
Bearing Unit
A pillow block bearing (or plummer block) is a pedestal used to provide support for a rotating shaft with the help of compatible bearings & various accessories. The assembly consists of a mounting block which houses a bearing. The block is mounted to a foundation and a shaft is inserted allowing the inner part of the bearing / shaft to rotate.
