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Apr . 24, 2024 10:03 Back to list

What is Bearing heavy duty spherical bearing


Introduction:

A bearing is a machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts.

The main purpose of a bearing is to provide free linear movement of the moving part or free rotation around a fixed axis or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts.

History:

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The invention of the rolling bearing, in the form of wooden rollers, supporting, or bearing, an object being moved is of great antiquity.

It may predate the invention of the wheel rotating on a plain bearing.

Leonardo da Vinci incorporated drawings of ball bearings in his design for a helicopter around the year 1500; this is the first recorded use of bearings in an aerospace design.

The first practical caged-roller bearing was invented in the mid-1740s by horologist John Harrison for his H3 marine timekeeper.

Why Bearings are so important?

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Functions of bearing:

1. Reduce friction and make the rotation more smooth

Friction is bound to occur between the rotating shaft and the part that supports the rotation. Bearings are used between these two components.

2. Protect the part that supports the rotation, and maintain the correct position for the rotating shaft

A large amount of force is needed between the rotating shaft and the part that supports the rotation. Bearings perform the function of preventing damage from being done by this force to the part that supports the rotation, and also of maintaining the correct position of the rotating shaft.

Types of Bearing:

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Types of Bearing:

1) Ball Bearings

-Deep-Groove Ball Bearings:

-Angular Contact Ball Bearings:

-Self-Aligning Ball Bearings:

-Thrust Ball Bearings

2) Roller Bearings

- Tapered Roller Bearings

- Spherical Roller Bearings

- Cylindrical Roller Bearings

- Needle Roller Bearings

3) Slewing Bearings

4) Pedestal/Pillow Block Bearing

- UCF

- UCP

- UCFA

6) Linear Bearings

7) Plain Bearings/Bush Bearing

8) Jewel Bearing

9) Fluid Bearing

10) Magnetic Bearing

11) Flexure Bearing

Nomenclature of bearing:

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Bearings usually consist of the following components:

-Two rings or discs with raceways

-Rolling elements in the form of rollers or balls

-A cage that keeps the rolling elements apart and guides them

The inner and outer rings are usually made from a special high-purity, chrome alloy steel. This material has the necessary hardness and purity – both important factors for a high load rating and a long service life.

The raceways are hardened, ground, and honed.

Rolling elements are either balls, rollers, cones, spheres, or needles. They are usually made from a special high-purity, chrome alloy steel.

The cage is responsible for keeping the rolling elements apart and guiding them. The materials used include steel, brass, and plastic.

Life of Bearing:

 

-In addition to natural wear and tear, bearings can fail (prematurely) due to other factors such as extreme temperatures, cracks, lack of lubrication, or damage to the

seals or cages. Bearing damage of this kind is often the result

of choosing the wrong bearings, inaccuracies in the design

of the surrounding components, incorrect installation or

insuffi cient maintenance.

-Basic fatigue life rating L10:

A bearing’s basic fatigue life rating is calculated using the

number of rotations which 90% of all bearings in a specific

group achieve or exceed a calculated time without failure

(probability of failure: 10%).

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