Deep groove ball bearings are the most common type of rolling bearings and are also the most widely used type of rolling bearings. They have low frictional resistance and high rotational speed, and can be widely used in motors, automobiles, and other general machinery and tools due to their ability to simultaneously withstand radial and axial loads in two directions.
Basic Composition and Classification of Deep Groove Ball Bearings
Deep groove ball bearings mainly consist of an inner ring, a set of steel balls, and a set of cages. As the most widely used bearing, it is inevitable to face various harsh operating environments. Therefore, deep groove ball bearings have also developed into two types: open type and closed type.
（1）Classification by Whether Closed
To cope with different scenarios, the closed deep groove ball bearings are further subdivided into different sealing forms, including dust cover type, non-contact seal type, and contact seal type bearings.
The dust cover (model suffix is Z) is mainly used in the working condition where the inner ring rotates. The dust cover is installed on the outer ring and forms a narrow gap with the inner ring. There is no friction loss during use, and it is made of stamped steel to maintain grease and prevent the invasion of dust and debris.
The non-contact seal (model suffix is RZ), the sealing cover is fixed on the outer ring of the bearing and forms an extremely narrow gap with the inner ring shoulder, which does not affect the operating speed of the bearing and has a better sealing effect than the dust cover. It is generally made of nitrile rubber reinforced with a steel skeleton.
The contact seal (model suffix is RS) is designed to be in close contact with the inner ring shoulder or the groove on the side of the inner ring. It is generally made of nitrile rubber or fluororubber. Due to the contact seal, the frictional torque is larger than that of the stamped dust cover or non-contact seal, and the high-speed performance of the bearing will also be affected by this structure. However, it has better dust and waterproof properties than ZZ and RZ.
（2）Classification by Arrangement Form
Generally divided into single-row deep groove ball bearings, full-ball deep groove ball bearings, and double-row deep groove ball bearings.
Single-row deep groove ball bearings: The structure is the most common and widely used. The internal steel balls are distributed along a single row, which can meet the radial and axial load-bearing requirements in most conventional working conditions. It has the advantages of simple structure, low cost, and easy installation. It can be seen in the rotating parts of various ordinary mechanical equipment.
Full-ball deep groove ball bearings: Compared with single-row deep groove ball bearings, it has more internal steel balls, almost filling the space between the inner and outer rings. This significantly improves its load-bearing capacity and is especially suitable for occasions with high radial load requirements. However, due to the increase in the number of steel balls, its rotational speed may be limited. It is often used in some heavy-duty but relatively low-speed equipment, such as small transmission parts in some mining machinery.
Double-row deep groove ball bearings: It has two rows of steel balls and can simultaneously withstand larger radial loads and bidirectional axial loads. The structure is relatively complex, but it is widely used in some precision equipment that requires high precision, high load-bearing capacity, and high balance requirements for axial and radial loads, such as the spindle support parts of some high-precision machine tools.
（3）Classification Based on Material Differences
It can be further divided into stainless steel deep groove ball bearings, all-ceramic deep groove ball bearings, and plastic deep groove ball bearings.
Stainless steel deep groove ball bearings: They have good corrosion resistance and can maintain stable performance in humid and corrosive media environments. They are often used in equipment in food processing, chemical, marine engineering, and other fields. For example, in food processing equipment that often comes into contact with various acid and alkali seasonings, moisture, and ship machinery and equipment in the marine environment, stainless steel deep groove ball bearings can effectively resist corrosion and extend the service life of the equipment.
All-ceramic deep groove ball bearings: Made of ceramic materials, they have many advantages such as high hardness, high temperature resistance, good self-lubricating properties, and low density. In some special equipment in high-temperature environments, such as certain auxiliary transmission parts of aerospace engines and transmission devices of high-temperature kilns, all-ceramic deep groove ball bearings can withstand extremely high temperatures. And due to their self-lubricating characteristics, they can operate stably even under limited lubrication conditions. At the same time, their lighter mass is helpful for reducing the moment of inertia and improving the dynamic performance of some high-speed rotating equipment with strict weight requirements.
Plastic deep groove ball bearings: Usually made of high-performance engineering plastics, they have good self-lubricating properties, corrosion resistance, and insulation properties, and are lightweight and low-cost. They are widely used in equipment with low load requirements, insulation requirements, and lightweight needs, such as heat dissipation fans in electronic equipment and rotating parts in small toys. They not only meet the basic operating requirements of the equipment but also show advantages in cost and specific performance.
Code Rules of Deep Groove Ball Bearings
The conventional code rules of deep groove ball bearings are as follows:
6 2 04 ZZ C3
6: Single-row deep groove ball bearing
2: Size series code
04: Inner diameter code
For less than or equal to 03, the bearing inner diameter is 00 10mm, 01 12mm, 02 15mm, 03 17mm. For greater than 03, the bearing inner diameter d = inner diameter code × 5mm
ZZ: Code for sealing ring and dust cover: ZZ for dust cover, RZ for non-contact seal, RS for contact seal
C3: Clearance code
Sealing Form Guide of Deep Groove Ball Bearings:
|
Structure |
Dust Cover (Z Type) |
Non-contact Seal (RZ Type) |
Contact Seal (RS Type) |
|
Frictional Torque |
Small |
Small |
Larger than ZZ and RZ types |
|
High-speed Performance |
Good |
Good |
Limited |
|
Grease Sealing |
Good |
Better than Z type |
Better than RZ type |
|
Dust Resistance |
Good |
Better than ZZ (usable |
Very good (suitable |
|
Waterproofness |
Not applicable |
Not applicable |
Good |
Selection Factors of Deep Groove Ball Bearings
In the selection of deep groove ball bearings, we can consider the following factors:
① Size and Nature of the Load
Deep groove ball bearings are mainly suitable for light and medium load working conditions, and their ability to withstand heavy and impact loads is limited. Therefore, when selecting deep groove ball bearings, it is necessary to focus on the actual load size and load distribution, and select according to the rated dynamic and static loads of the bearings. For example, in the gearbox of a car, deep groove ball bearings are used to support the gear bearings. Since the load and vibration are small and the bearing is in the gearbox with a good operating environment, we can consider selecting ordinary deep groove ball bearings to meet the usage requirements.
Recommendation for Selection by Yiheda:
② Rotational Speed
Deep groove ball bearings are suitable for high-speed rotation occasions, but the speed limit is relatively large. For example, different sealing covers, different lubrication methods, and different bearing clearances will all limit the ultimate speed of the bearing. It is necessary to select a matching deep groove ball bearing according to the actual speed requirements. For example, in the support of the motor rotor, deep groove ball bearings are used to support the rotor shaft. The operating speed is high, and there is a certain dust-proof requirement. We select a special motor clearance + double-sided dust cover type of deep groove ball bearing.
Recommendation for Selection by Yiheda:
③ Operating Environment
Deep groove ball bearings are suitable for a wide range of temperature and humidity environments. For relatively special high-temperature and corrosive environments, stainless steel bearings or high-temperature-resistant bearings can also be selected. However, it is necessary to maintain a clean and dust-proof environment. When selecting deep groove ball bearings, comprehensive consideration should be given to the actual operating environment. For example, in a cement plant, for the support bearings of the conveyor belt rollers, due to the relatively harsh operating environment, a deep groove ball bearing with a contact seal is selected to avoid the impact of dust on the operation of the bearing.
Recommendation for Selection by Yiheda:
④ Cost
The cost of deep groove ball bearings is relatively low and is suitable for many low-cost occasions. When selecting deep groove ball bearings, combined with specific scenarios, our company's economic bearings can be selected. For example, in the recently popular fingertip gyroscope, deep groove ball bearings are used for the main support shaft. Selecting our company's economic deep groove ball bearings can meet the low-cost requirements while ensuring quality.
Recommendation for Selection by Yiheda:
The above are the product characteristics and relatively common application examples of deep groove ball bearings. When selecting deep groove ball bearings, comprehensive consideration and analysis should be carried out according to the actual application scenarios to select the most suitable specifications to ensure the performance and overall service life of mechanical equipment. Of course, deep groove ball bearings have more application products and design variations. For more product requirements, please communicate with our engineers for design and selection.
