1. Brief introduction

Deep groove ball bearing is the most common type of rolling bearing, and its inner and outer raceways are arc-shaped deep grooves.

Deep groove ball bearings are mainly used to bear radial loads and small axial loads. The friction coefficient of deep groove ball bearings is very small, and the limit speed is also high. Its sealed structure products do not need relubrication and maintenance.

The structure of the deep groove ball bearing is simple, and it is easy to achieve higher manufacturing precision compared with other types. It can be produced in large quantities, the manufacturing cost is also low, and it is extremely convenient to use.

In addition to the basic type, deep groove ball bearings also have various variant structures, such as (see the example on the right for details):

Deep groove ball bearing with dust cover; deep groove ball bearing with rubber sealing ring; deep groove ball bearing with stop groove; deep groove ball bearing with filling port; double row deep groove ball bearing.

Open base structure		The most commonly used basic structure is represented by the basic code, for example: 6204
Bearing structure with stop groove		Use "N" after the model, for example: 6204N
Bearing structure with snap ring		Use "NR" after the model, for example: 6208NR
With flanged bearing structure		Commonly used miniature bearings, add "F" before the code, for example: F683
Dust cover sealing structure		Use "Z" after the code to indicate "Z" on one side and "2Z" on both sides, for example: 6204-Z, 6204-2Z
Non-contact sealing structure		Use "RZ" after the code, "RZ" on one side and "2RZ" on both sides, for example: 6204-RZ, 6204-2RZ
Contact seal structure		Use "RS" after the code name, "RS" on one side and "2S" on both sides, for example: 6204-RS, 6204-2RS
High Load Deep Groove Ball Bearings		Non-standard products can increase the number of steel balls and improve the load capacity. Add "E" after the code, for example: 6210E
Double Row Deep Groove Ball Bearings		There are often two series of 42XX and 43XX, for example: 4205, 4305

 

1) Deep groove ball bearings with shields
The function of the dust cover is to prevent the leakage of grease and the intrusion of external foreign matter, and there are single-sided and double-sided dust-proof covers.
Bearings with dust covers are used in occasions where it is difficult to lubricate alone, it is inconvenient to arrange the lubricating oil circuit and check the lubrication situation, and low friction torque and high temperature are required. The bearings have been filled with a certain amount and brand of grease before leaving the factory. The amount of grease for each set of bearings is usually 1/4 to 1/3 of the effective space of the bearing cavity, and the amount of grease injection can also be increased or decreased according to user requirements. The injected lubricating grease can usually guarantee the operation of the bearing under the working condition of -40～+120℃. If the user has higher requirements for the bearing, other special performance grease can be filled according to the situation. Bearings with dust covers can work effectively for a long time after being greased, and there is no need to add grease during use.
Bearings with dust covers are mostly used at both ends of rotors of small and medium-sized generators and motors, automobiles, tractors, air conditioners, fans, etc., as well as occasions that have special requirements for noise and vibration of bearings.

2) Deep groove ball bearings with rubber seals
Deep groove ball bearings with sealing rings have contact and non-contact seals, and single-sided and double-sided seals. Contact seals can be designed and manufactured as light contact, medium contact, and heavy contact according to different parts of use. Mode.
The performance, grease filling and use of bearings with seal rings are basically the same as those of deep groove ball bearings with shields. The difference is that the bearing with dust cover has a large gap between the dust cover and the inner ring, while the gap between the seal ring and the inner ring of the non-contact sealed ball bearing is very small, and the sealing lip of the contact seal ring bearing There is no gap with the inner ring, and the sealing effect is good, but the friction has increased.
Where low noise is required, small-sized deep groove ball bearings of series 60 and 62 are often used. Regardless of open bearings or closed bearings (bearings with dust cover or seal ring), low noise and low vibration requirements can be put forward when ordering.

3) Deep groove ball bearings with snap grooves and snap rings
The structure of the outer ring with stop groove, stop ring and flange can realize axial positioning, which simplifies the installation structure of the housing.
Deep groove ball bearings with stop grooves and stop rings are mostly used in working parts such as automobiles and tractors.

4) Deep groove ball bearings with filling notches
The main dimensions of deep groove ball bearings with filling gaps are the same as the 62 or 63 series of deep groove ball bearings. Both the inner and outer rings have ball filling gaps, so the number of steel balls is more than that of ordinary deep groove ball bearings, and the rated dynamic load is 20-35% larger.
This type of bearing is not suitable for occasions with large axial loads because it has a ball filling gap. When used in combined loads dominated by radial loads, the condition of radial equivalent dynamic load Pᵣ<0.5C₀ᵣ should be met.

5) Double row deep groove ball bearings
If necessary, please contact the technical center of Renben Group.

 

2. Sealing

Performance Comparison of Sealed Deep Groove Ball Bearings

Features	With dust cover	With sealing ring
	Contactless	Contactless	Contact	light touch
	2Z	2RZ	2RS	2RS
Friction moment	small	small	big	smaller
High speed	better	OK	Restricted due to contact	better
Grease tightness	better	Better than ZZ type	When the speed is low, it is better than 2RZ	Very good
Dustproof	better	Better than ZZ type, it can also be used in the occasion of multi-powder	Better than ZZ type, it can also be used in the occasion of multi-powder	Very good
Waterproof	Not so good	Better than ZZ and worse than 2RS	Pretty good	OK
Using temperature range	-30～110℃		-30～110℃	-30～110℃

Note: This is the operating temperature range of standard bearings. Changing the type of grease and the material of the sealing ring can expand the operating range. Please contact the technical center of Renben Group.

 

3. Radial Equivalent Dynamic Load

Pᵣ=XFᵣ+YFₐ
The values of X and Y are determined by the ratio of the axial load Fₐ and the basic rated static load of the bearing. The X and Y coefficients are shown in the table below：

Relative axial load	Single row bearing				e
f₀Fₐ —— C₀ᵣ	Fₐ　 —≤e Fᵣ		Fₐ　 —＞e Fᵣ
	X	y	X	y
0.172 0.345 0.689 1.03 1.38 2.07 3.45 5.17 6.89	1	0	0.56	2.3 1.99 1.71 1.55 1.45 1.31 1.15 1.04 1	0.19 0.22 0.26 0.28 0.3 0.34 0.38 0.42 0.44

 

4. Radial equivalent static load

P₀ᵣ=0.6Fᵣ+0.5Fₐ
When P₀ᵣ<Fᵣ, take P₀ᵣ=Fᵣ

 

"SA" Series Automobile Alternator Bearings

Automobile alternators, long-term exposed to brush wear particles and external dust and muddy water, operate from low speed to high speed under high temperature and high load, and their working conditions are very harsh, so the requirements for their bearings are very high . These requirements are mainly: high reliability, high fatigue life, high sealing performance, and high temperature resistance.

C&U automotive alternator bearings are designed according to their actual working conditions, using special raw materials, heat treatment methods, sealing structures, lubrication schemes, etc., which perfectly meet the needs of working conditions. These products are distinguished by adding "SA" before the code .

 

"TM" series deep groove ball bearings for automotive gearboxes

Deep groove ball bearings for automobile gearboxes work in the oil mist environment formed by the lubricating oil in the gearbox, and metal impurities such as gear wear iron chips contained in the lubricating oil will enter the inside of the bearing, which will easily cause the outer starting point of the raceway to peel off At the same time, because the gearbox mainly transmits torque by helical gears, helical gears and other forms of gears, the bearings must be able to withstand large axial loads and impact loads. With the advancement of technology, people are concerned about reliability, vibration and noise put forward higher requirements.

C&U deep groove ball bearings for automotive gearboxes adopt the design method of ultimate load according to their actual working conditions, and at the same time use special raw materials, heat treatment methods, sealing structures, etc., which perfectly meet the needs of working conditions. This type of product is code-named Add "TM" before to distinguish.

 

Single Row Deep Groove Ball Bearings

 

"SA" Series Automobile Alternator Bearings

 

"TM" series deep groove ball bearings for automotive gearboxes

FAQ

What our customers said

Deep groove ball bearing is the most common type of rolling bearing, and its inner and outer raceways are arc-shaped deep grooves. Deep groove ball bearings are mainly used to bear radial loads and small axial loads. The friction coefficient of deep groove ball bearings is very small, and the limit speed is also high. Its sealed structure products do not need relubrication and maintenance.