For those who are often in contact with machinery, they all know that the role of bearings cannot be underestimated. However, many people are still confused about the relevant knowledge and functions of bearings. Today I will give you a brief introduction.

1. Bearing definition

Compared with large machinery, the bearing is a small component, but it plays a pivotal role.

And it is mainly a component that fixes and reduces the friction coefficient of the load in the process of mechanical transmission. When other parts move relative to each other on the shaft, the bearing can be used to reduce the friction coefficient during the power transmission process and maintain the fixed position of the shaft center. According to the different friction properties of moving elements, bearings can be divided into rolling bearings and sliding bearings.

2. Bearing type

According to the function, design and function of the bearing, there are many types of bearings, generally including: needle roller bearings, self-aligning Ball bearings, deep groove ball bearings, spherical roller bearings, thrust bearings, housed bearings, spherical plain bearings, combined bearings, rolling mill bearings, etc. Different bearings have different functions and play an important role in different mechanical equipment.

3. Bearing code

A complete bearing code is composed of basic code, pre-code and post-code, and in the order of arrangement: : Front code base code post code.

A. The prefix code is used to distinguish the bearing when the structural shape, size, tolerance, technical requirements, etc. are changed, and it is marked with letters;

B. The basic code is used To indicate the basic type, structure and size of the bearing, which is the basis of the bearing code. Electric vehicles use deep groove ball bearings. The basic code consists of three parts: bearing type code, size series code and inner diameter code: type code size series code inner diameter code

①Type code, use numbers or letters Marking

0

Double row angular contact ball bearing

6

Deep groove ball bearing

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Self-aligning ball bearings

7

Angular contact ball bearings

2

Spherical roller bearings and Thrust Spherical Roller Bearings

8

Thrust Cylindrical Roller Bearings

3

Tapered Roller Bearings

N

cylindrical roller bearings

4

double row deep groove ball bearings

U

Outer spherical ball bearing

5

Thrust ball bearing

QJ

Four-point contact ball bearing

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②Dimension series code (only deep groove ball bearings are listed, see the picture below)

Deep groove ball bearing diagram

Type code

Dimension series code

Bearing code

6

17

61700

6

37

73700

6

18

61800

6

19

61900

16

(0)0

16000

6

(1) 0

6000

6

(0)2

6200

6

(0)3

6300

6

(0)4

6400

③Inner diameter code

Nominal inner diameter of bearing/㎜

Inner diameter code

Example

0.6～10(non-integer)

It is directly marked with the nominal inner diameter in millimeters, and /

Deep groove ball bearings with an inner diameter of 2.5 are added between the size series codes, code 618/2.5

1～9 (integer )

It is directly marked with the nominal inner diameter in mm, and /

Deep groove ball bearing with inner diameter 5 is added between the dimension series codes, code 618/5

10～17

10

00

Deep groove ball bearing with inner diameter 10, code 6200

12

01

15

02

17

03

20～480 (except 22, 28, 32)

The quotient of dividing the nominal inner diameter by 5, the quotient is the single digit, which needs to be preceded by 0

The aligning of the inner diameter of 40 Roller bearings, code 23208

≥500, 22, 28, 32

marked directly with the nominal inner diameter in millimeters, and added between the dimension series codes

Deep groove ball bearings with an inner diameter of 22, code 6222

C. The supplementary code refers to the components of the bearing that have different structures or other characteristics of the basic design.

4. Common specifications

Deep groove ball bearings are often used in electric vehicle motors and front wheels, and the size code is (0) 2 series , the common ones are (6000, 6001, 6002, 6003) and (6200, 6201, 6202, 6203). For example: 6203, 6 means 'deep groove ball bearing

Just remember the last number: 00 inner diameter is 10mm, 01 inner diameter is 12mm, 02 inner diameter is 15mm, 03 inner diameter is 17mm.