Knowledge About Ball Bearing

Knowledge about BALL BEARING

Defination

Ball bearing is a kind of rolling bearing.

The ball is installed between the inner ring and the outer ring and can bear a large load.

Ball Bearings reduces the friction in the process of power transmission and improves the transmission efficiency of mechanical power.

It is the most widely used bearings type for high speed rotation.

Structure

Ball bearings are mainly composed of four basic elements:

  • Ball
  • Inner ring
  • Outer ring
  • Retainer, also called cage

The balls and rings of general industrial ball bearings are usually made of high chromium steel, with Rockwell C-scale hardness between 61-65.

The hardness of the retainer is lower than that of the ball and ring, and its materials are metal (such as: medium carbon steel, aluminum alloy) or non-metal (such as: Teflon, PTFE, polymer materials).

Ball bearings have lower rotational frictional resistance than journal bearings, so at the same speed, the temperature generated by friction will be lower.

Classification

Deep Groove Ball Bearing

Description

Deep groove ball bearings are the most widely used bearing type. It has low friction and are optimized for low noise and low vibration which enables high rotational speeds.

The raceway grooves on both the inner and outer rings of deep groove bearings have circular arcs of slightly larger radius than that of the balls.

It include shield bearings and sealed bearings with grease make it easier to use.

Also, snap rings are sometimes used on the periphery.

As to cages, pressed steel ones are the most common.

They accommodate radial and axial loads in both directions, are easy to mount, and require less maintenance than other bearing types.

Type

  • Single Row Deep Groove Ball Bearings
  • Stainless Steel Deep Groove Ball Bearings
  • Double Row Deep Groove Ball Bearings
  • INSOCOAT Bearings
  • Hybrid Bearings
  • High Temperature Bearings and Bearing Units
  • Sensor Bearing Units

Features

  • Low friction and running temperatures, low noise and vibration
  • High running speeds
  • High quality and performance capabilities for your application
  • Accommodate radial loads and axial loads in both directions
  • Available with a variety of greases for most conditions, including food quality grease, high temperature grease and Solid Oil
  • Increased reliability and provide long bearing and lubricant service life

Applications

The used of Deep groove ball bearings are very widespread.

Matching that versatility across many different applications, it is available in a wide range of designs, variants and sizes.

Deep groove ball bearings are highly suitable for applications where high speeds and low power loss are required, the details is as below.

Electric motors and generators

Agriculture

Material handling

Industrial transmissions

Food and beverage

Industrial pumps

Industrial fans

Two and three wheelers

Cars and light trucks

Insert Bearings

Description

Insert bearings are based on sealed deep groove ball bearings in the 62 and 63 series, but have a convex outer ring and in most cases an extended inner ring with a specific locking device, enabling quick and easy mounting onto the shaft.
It normally to be sold together with a pillow block housing, although it also can be consider an independent products.

Features and benefits

Quick and easy to mount: The different locking methods enable quick and easy mounting of insert bearings onto the shaft.

Accommodate initial misalignment: The spherically shaped outside surface enables initial misalignment by tilting in the housing.

Long service life: The different sealing solutions available provide a long service life for a wide variety of applications with high contamination levels.

Reduced noise and vibration levels: Where high requirements on noise and vibration levels are important, We can provide the appropriate shaft locking method.

Angular Contact Ball Bearings

Description

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 it is capable of taking radial loads and also axial loads in one direction. Four contact angles of 15, 25, 30 and 40 are available. 

The axial load carrying capacity of angular contact ball bearings increases as the contact angle increases. 

For high speed operation, however, the smaller contact angles are preferred.

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

Pressed steel cage are widely used, while for high precision bearings with contact angle less than 30, polyamide resin cages are often used.

Type

  • Single Row Angular Contact Ball Bearings
  • Double Row Angular Contact Ball Bearings
  • Four Point Contact Ball Bearings

Applications

Here are examples of applications in which angular contact ball bearings might be used:​

  • Industrial pumps
  • Industrial gearboxes
  • Renewable energy
  • Compressors
  • Industrial electric motors & generators
  • Trucks, trailers and buses
  • Metals

Self-aligning Ball Bearings

Description

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 axis of the inner rings, balls and cage can deflect to some extent around the bearing center. Consequently, minor angular misalignment of the shaft and housing caused by machining or mounting error is automatically corrected.

Self-aligning ball bearing often has a tapered bore for mounting using an adapter sleeve. 

Features

Accommodate static and dynamic misalignment: The bearings are self-aligning like spherical roller bearings or CARB bearings.

Excellent high-speed performance: Self-aligning ball bearings generate less friction than any other type of rolling bearing, which enables them to run cooler even at high speeds.

Minimum maintenance: Because of low heat generation, the bearing temperature is lower, leading to extended bearing life and maintenance intervals.

Low friction: Very loose conformity between balls and outer ring keeps friction and frictional heat at low levels.

Excellent light load performance: Self-aligning ball bearings have low minimum load requirements.

Low noise: Self-aligning ball bearings can reduce noise and vibration levels, for example, in fans.

Applications

Here are examples of applications in which self-aligning ball bearings might be used:​

  • Industrial fans
  • Agriculture
  • Material handling
  • Food and beverage
  • Pulp and paper

Thrust Ball Bearing

Description

Thrust ball bearings are supplied as single direction or double direction thrust ball bearings. Single direction thrust ball bearings is composed of washer-like bearing rings with raceway grooves. 

The ring attached to the shaft is called the shaft washer(or inner ring) while that attached to the housing is called the housing washer. 

For double direction thrust ball bearings, there are three rings with the middle one(center ring) been fixed to the shaft. 

They are designed to accommodate axial loads only and must not be subjected to any radial load.

Pressed steel cage are usually used in the smaller bearings and machine cages in the larger ones.

In addition to the bearings presented in this section, we supplies thrust ball bearings for special application requirements. This assortment includes bearings with Solid Oil and NoWear coated bearings.

Features and Benefits

Separable and interchangeable: The separable components of thrust ball bearings are interchangeable . This facilitates mounting and dismounting, and maintenance inspections.

Initial misalignment: Bearings with sphered housing washers can accommodate initial misalignment.

Interference fit: Shaft washers have a ground bore to enable an interference fit. The bore of the housing washer is turned and always larger than the shaft washer bore.

Applications

Below are examples of applications in which thrust ball bearings might be used:

  • Industrial fans
  • Industrial pumps
  • Metals
  • Industrial transmissions
  • Mining, mineral processing and cement

Angular Contact Thrust Ball Bearings

Description

Angular contact thrust ball bearings are separable, the washers and ball and cage assemblies can be mounted independently of each other. Although originally designed to support the rotary tables of drilling rigs, they are also suitable for other applications.

NSK angular contact thrust ball bearing (also known as Ball screw support bearing) are designed to provide increased motion control for grinding, milling and machining centers. ,machine tool driving mechanism.

Features and Benefits

  • Accommodate axial and radial loads
  • High load carrying capacity
  • High axial stiffness
  • Low friction
  • High-speed performance

Thin Section Bearings

Description

Thin section bearing solutions save weight, create space, reduce friction, increase design flexibility, and provide excellent running accuracy. 

Thin section bearings are available in a wide variety of materials, separator options, cross-sections, internal fit up choices, lubricants, corrosion resistance options and contact angles. With bore sizes from 3/4 inch to 40 inches (19 mm to 1 m).

SDVV BEARING GROUP LIMITED provides the largest range of thin section bearings. 

Applications

  • Aerospace and Defense
  • Commercial Aerospace 
  • Heavy Equipment 
  • Industrial Machinery 
  • Medical Systems 
  • Mining 
  • Oil and Gas 
  • Robotics
  • Semiconductor
  • Solar
  • Wind market

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