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how bearings work

by:QY Precision      2019-10-12
There are many types of bearings, each for different purposes.
These include ball bearings, roller bearings, ball thrust bearings, roller thrust bearings and cone roller thrust bearings.
Ball bearings may be the most common type of bearing as shown below.
From straight shoes to hard drives, they all have.
These bearings can handle both radial and thrust loads, which can usually be found in applications where the load is relatively small.
In a ball bearing, the load is passed from the outer ring to the ball and from the ball to the inner ring.
Since the ball is a sphere, it only touches the inner and outer races at a very small point, which helps it spin very smoothly.
But this also means that there are not many contact areas carrying this load, so if the bearing is overloaded, the ball will deform or squeeze and destroy the bearing.
The Rolling bearings shown in the following figure are used in applications such as conveyor rollers, and they must bear larger radial loads.
In these bearings, the roller is a cylinder, so the contact between the inner and outer rings is not a point, but a line.
This distributes the load in a larger area, enabling the bearing to handle loads much larger than the ball bearing.
However, this type of bearing is not designed to handle a large amount of thrust load.
A variant of this bearing, called a needle bearing, uses a cylinder with a very small diameter.
This enables the bearing to be installed in a tight place.
Thrust ball bearings as shown below are mainly used for low thrust bearings
Fast speed, can not withstand a large radial load.
Bar chair, lazy Susan turntable uses this type of bearing.
Rolling thrust bearings like shown below can support large thrust loads.
They often appear in the gear set, such as a car transmission between gears, between the housing and the axis of rotation.
Spiral gears used in most transmissions have angled teeth--
This results in a thrust load that must be supported by the bearing.
Cone roller bearings can withstand large radial and thrust loads.
Cone roller bearings are used in automotive hubs and they are usually installed in pairs and face in the opposite direction so that they can handle both-way thrust.
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