What are the types of bearing

Posted on Aug 13, 2020

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What are the types of bearing

A deep groove ball bearing is a type of roller bearing that uses balls to maintain separation between the moving parts of the bearing.

The task of a ball bearing is to reduce rotational friction and to transfer radial and axial loads. It achieves this by using at least two races to hold the balls and carry loads through the balls. Usually one of the races is fixed. The rotation of one of the bearing races also causes the balls to rotate. As the balls roll, they have a much lower coefficient of friction than if two flat surfaces rotate relative to each other.

1. BALL BEARINGS:

A deep groove ball bearing is a type of roller bearing that uses balls to maintain separation between the moving parts of the bearing.

The task of a ball bearing is to reduce rotational friction and to transfer radial and axial loads. It achieves this by using at least two races to hold the balls and carry loads through the balls. Usually one of the races is fixed. The rotation of one of the bearing races also causes the balls to rotate. As the balls roll, they have a much lower coefficient of friction than if two flat surfaces rotate relative to each other.

Ball bearings tend to have a lower load capacity due to their size than other types of rolling bearings due to the smaller contact area between the balls and raceways. However, they can tolerate some mismatch of inner and outer race.

Compared to other rolling bearings, a deep groove ball bearing is the cheapest, mainly due to the low cost of producing the balls used in the bearing. There are several common ball bearing designs, each with different compromises. They can be made of many different materials, including: stainless steel, chrome steel and ceramics. A hybrid ball bearing is a bearing with ceramic balls and metal rings.

:: Read more : Ball Bearing & Loading Capacity

 

• 1.1. Single row ball bearing:

a) general:

The Rigid Ball Row Bearing is a bearing with a very good price performance ratio; it is relatively universal.

b) Skills:

It has good ability to bear radial loads as well as axial loads in two directions. It shows a swivel and is available in an instrumented version that allows in particular to determine the rotational speed of the shaft.

c) Applications:

These types of bearings are used in all areas of mechanical engineering in general (flaps, jet engine bearings, helicopter gears, deck equipment ...). It is available with a segment that allows axial fixing without a retaining wall in the housing.

 

• 1.2. Double row ball bearing:

a) general:

These bearings require good alignment between the shaft and housing.

b) Skills:

This type of bearing allows high radial and axial loads in both directions.

Sometimes a preferential way is seen for filling incisions. This bearing can be mounted alone or together with another bearing (when alignment is required).

c) Applications

This type of bearing is used in pumps, reducers (wheel and screw), equipment ...

 

• 1.3. Double row self-aligning ball bearing:

a) general:

Self-aligning ball bearing has two rows of balls and a common concave spherical raceway in the outer ring. The bearing is consequently self-aligning and insensitive to angular misalignments of the shaft relative to the housing.

b) Aptitudes:

Self-aligning ball bearings with an extended inner ring are designed for less demanding applications where commercial grade shafts are used. The special hole tolerance enables easy assembly and disassembly.

c) Applications

It is particularly suitable for applications where significant shaft deflection or misalignment is to be expected.

In addition, a self-aligning ball bearing has the lowest friction of all rolling bearings, which allows cooler operation even at high speeds.

Self-aligning ball bearings with an elongated inner ring are axially seated on the shaft by a pin or a cheese head screw that fits into a slot on one side of the inner ring and also prevents the inner ring from rotating on the shaft.

When two self-aligning ball bearings with an extended inner ring are used to support a shaft, they must be positioned so that the inner ring slots face each other or are at the bearing outer positions.

If this is not the case, the shaft is axially located in one direction only.

 

• 1.4. Single and double row angular contact bearing:

a) general:

Angular contact ball bearings have raceways in the inner and outer rings that are offset from each other towards the bearing axis. This means that they are designed to accommodate combined loads, ie radial and axial loads acting simultaneously.

b) Skills:

The axial load capacity of angular contact ball bearings increases with increasing contact angle.

The contact angle is defined as the angle between the line joining the contact points of the ball to the raceways in the radial plane along which the load is transferred from one raceway to the other, and a line perpendicular to the bearing axis.

The contact angle ranges from 15 ° to 40 ° and is measured relative to a line running perpendicular to the bearing axis. Angular contact bearings are unidirectional thrust bearings that can withstand heavy thrust loads and moderate radial loads.

See below: Single angular contact bearing.

c) Applications:

Angular contact bearings can have many different types of seals or shields. Seals and covers provide protection against contamination and as a lubricant retainer.

Seals provide better protection and grease retention than covers, but have lower top speeds.

Ball Screw Support Bearings are specially designed for use in ball screw or lead screw applications.

Some bearings may also be flanged. Angular contact bearings can have different lubrication options.

See below: Double row angular contact bearing.

 

2. ROLLER BEARING:

Roller bearings are one of the most widely used industrial bearings. They are called rolling bearings because they are able to bear the load by placing round pieces between the two parts. As the two elements move, these circular elements roll, thus helping to carry the load.

Most roller bearings use cylinder whose length is slightly greater than its diameter. Roller bearings have higher radial load capacity compared to ball bearings but higher friction and a low axial capacity under axial loads.

 

• 2.1. Applications of roller bearings:

Roller bearings are used in rotary applications to replace sliding movement with low friction, rolling.

Automated roller bearing setting techniques offer many advantages like reduced setting time, assembly cost, and and reliable setting. To select the right roller bearing, one must determine the desired bearing life and a sufficient basic dynamic load rating to meet that life requirement.

Roller bearings are used in power generation, wind turbines, gear drives, rolling mills, machine tool spindles, gear reduction units etc.

Roller bearings are the earliest known type of rolling-element-bearing.

 

• 2.2. One row, two row cylindrical bearings:

a) General:

This type of bearing supports axial loads only in one direction. They are thus generally used in pairs, opposing each other. Their play must be regulated in order to obtain a good rigidity for the connection. They can also be installed side by side.

b) Aptitudes:

These bearings support loads combined with predominant axial component at high speeds. The standard bearings have a contact angle of approximately 40°, whereas the precision bearings have angles of 15° or 25°. The bearings installed by pairs have speed limits weaker than the simple bearing.

c) Uses:

These bearings are found in many aircrafts, bearings for jet engines, electric motors, alternators, brushes for machines, etc

:: Read more : The Functionality and Advancement of Bearing

 

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