Basic parameters
Deep groove ball bearings are the most widely used and common type of rolling bearings. They consist of an outer ring, an inner ring, steel balls, and cages.
These bearings are available in two configurations: single row and double row. The structure of deep groove ball bearings can also be divided into two types: sealed and open.
Open bearings lack a sealing structure, while sealed bearings come in two types: dustproof and oil-proof. The dustproof seal is made of stamped steel plate and serves to prevent dust from entering the bearing raceway. On the other hand, the oil-proof seal is a contact-type oil seal that effectively prevents grease from overflowing.
The code for single row deep groove ball bearings is 6, while the code for double row bearings is 4. This type of bearing is favored for its simple structure and ease of use.
Working principle
Deep groove ball bearings are primarily designed to handle radial loads, but they can also withstand a combination of radial and axial loads.
If the bearing is subjected to only radial loads, the contact angle is zero. However, if the deep groove ball bearing has a large radial clearance, it can function similarly to an angular contact bearing and support significant axial loads.
One of the key advantages of deep groove ball bearings is their low coefficient of friction and high speed limit.
Bearing characteristics
Deep groove ball bearings are the most widely used type of rolling bearings, known for their durability and low maintenance requirements. They are suitable for high speeds and can even handle very high speeds. These bearings have a simple structure, a low manufacturing cost, and are easy to produce with high precision.
The dimensional range and forms of deep groove ball bearings are diverse, making them ideal for use in precision instruments, low-noise motors, automobiles, motorcycles, and general machinery. They can mainly handle radial loads and can also withstand some axial load. The capacity to carry axial load increases when a larger radial clearance is chosen. The contact angle is zero when subjected to a pure radial force, but it is greater than zero when there is an axial force.
Stamped wave cages, solid cages, and nylon frames are commonly used in the manufacture of deep groove ball bearings. After being mounted on a shaft, the axial displacement of the shaft or casing can be restricted within the axial clearance of the bearing, allowing for axial positioning in both directions. This type of bearing also has a certain ability to self-align. Although it can still function normally when inclined 2-10 degrees with respect to the casing hole, this may have some impact on its lifespan.
The cages of deep groove ball bearings are typically made of steel-plated wave cages, while larger bearings are mostly constructed from metal body cages. These bearings are simple and easy to use, and are mainly used to withstand radial loads. However, when the radial clearance of the bearing is increased, it can handle combined radial and axial loads. In high-speed applications where thrust ball bearings are not suitable, deep groove ball bearings can also be used to handle pure axial loads.
Compared to other bearings of the same size, deep groove ball bearings have a low friction coefficient and a high limit speed. However, they are not suitable for heavy loads and are not resistant to impact.
Structural classification
Bearing construction
The deep groove ball bearing is favored for its simple structure and ease of high-precision manufacturing, making it highly suitable for mass production. This results in low manufacturing costs and widespread use.
In addition to its basic form, deep groove ball bearings come in a variety of variations to meet different needs.
Such as:
- Deep groove ball bearing with dust cover
- Deep groove ball bearing with rubber sealing ring
- Deep groove ball bearing with snap groove
- Deep groove ball bearing with large load capacity with ball gap
- Double row deep groove ball bearing
Bearing type
- Single row deep groove ball bearings
- Single row deep groove ball bearing with dust cover
- Single row deep groove ball bearing with dust cover and sealing ring
- Single row deep groove ball bearing with stop groove and stop ring on the outer ring
- Deep groove ball bearing with ball gap
- Double row deep groove ball bearings
According to size, deep groove ball bearings can be divided into the following categories:
(1) Miniature bearings – with a nominal outside diameter range of 26mm or less.
(2) Small bearings – with a nominal outer diameter range of 28mm to 55mm.
(3) Small to medium-sized bearings – with a nominal outer diameter range of 60mm to 115mm.
(4) Medium to large bearings – with a nominal outer diameter range of 120mm to 190mm.
(5) Large bearings – with a nominal outer diameter range of 200mm to 430mm.
(6) Extra large bearings – with a nominal outer diameter range of 440mm or greater.
Application
Deep groove ball bearings have a wide range of applications, including gearboxes, instrumentation, motors, household appliances, internal combustion engines, transportation vehicles, agricultural machinery, construction equipment, roller skates, and yo-yos.
