ニュース

ボールベアリングの名称はどのように決まるのですか？

The nomenclature of a ボールベアリング usually follows certain rules and standards, which help identify the basic types, structures, dimensions, and special characteristics of bearings.

Today, the naming rules of bearings are described in detail. For people who are often in contact with machinery, we all know that the role of bearings is not to be underestimated. However, many people are still confused about the knowledge and utility of bearings.

In mechanical products, bearings belong to high-precision products, not only need mathematics, physics and many other disciplines of the theory of integrated support, and need materials science, heat treatment technology, precision machining and measurement technology, numerical control technology and effective numerical methods and powerful computer technology and many other disciplines to serve, so the bearing is a representative of the national scientific and technological strength of the product.
For frequent contact with machinery, we all know that the role of bearings is not to be underestimated. However, many people are still confused about the knowledge and function of bearings.
A complete bearing code is composed of the basic code, front code and rear code, and in accordance with the layout order: front code – basic code – rear code.

A before the code: is bearing in the structure shape, size, tolerance, technical requirements, such as changes in the distinction between the use of letters to indicate. Such as with L can be separated bearing can be separated ring; K said bearing rolling body and keep frame components and so on. The actual application of rolling bearing type is a lot of, the corresponding bearing code is also more complex;
B basic code: the basic code is used to indicate the inner diameter of the bearing, diameter series, width series and type, generally up to five digits, is the basis of the bearing code. Basic code has bearing type code, size series code and inner diameter code 3 parts: type code – size series code – inner diameter code (2 digits);

The basic code of the preparation rules:
1, bearing diameter with the basic code right from the first, H digits.
For commonly used inner diameter d = 20 ~ 480mm bearing diameter is generally a multiple of 5, the two figures indicate the size of the bearing inner diameter is 5 divided by the quotient, such as 04 that d = 20mm; 12 that d = 60mm and so on. For the inner diameter of 10mm, 12mm, 15mm and 17mm bearings, the inner diameter code for 00, 01, 02 and 03. For the inner diameter of less than 10mm and greater than 500mm bearings, the inner diameter of the method of expression of other provisions, can refer to GB/T272-93.
2, the diameter of the bearing series with the basic code right from the third digit.
For example, for centripetal bearings and centripetal thrust bearings, 0,1 means extra light series; 2 means light series; 3 means medium series; 4 means heavy series. The size comparison between each series is shown in the figure below. Thrust bearings, in addition to 1 for extra light series, the rest of the same as the centripetal bearings.
3, the width of the bearing series with the basic code right from the fourth digit.
When the width of the diameter series of comparison as 0 series, most of the bearings in the code may not mark the width of the series code O, but for spherical roller bearings and tapered roller bearings, the width of the series code 0 should be marked. And diameter series code and width series code collectively referred to as size series code.
4, bearing type code with basic code right from the fifth digit (for cylindrical roller bearings and needle roller bearings and other types of code for the letter)
Example: (1) general ボールベアリング basic code by type code + size series code + inner diameter code composition. Example: 62046-type code, 2-size series code, 04-inner diameter code (2) automobile air conditioning electromagnetic clutch bearing basic code by the inner diameter size code + type code + outer diameter size code + width size code composition Example: 35BD502035 -Inner diameter size code, BD-type code, 50-outer diameter size code, 20-width size code (3) Wheel hub bearing basic code from the type code + inner diameter size code + outer diameter size code + width size code. Example: DAC40740042DAC-type code, 40-inner diameter size code, 74-outer diameter size code, 42-width size code. (4) outer spherical bearing basic code by the type code + size series code + inner diameter code. Example: U205U-type code, 2-size series code, 05-inner diameter code.

C rear code: the rear code of the bearing is to use letters and numbers, etc. to indicate the structure of the bearing, tolerance and special requirements of the material, etc., is the parts of the bearing and the basic design of a different structure or other characteristics of the variant.
The preparation rule of rear code
a, after the code is placed on the right side of the basic code and with the basic code empty half a Chinese character distance (code symbols “-”, “/” except.). When changing the project more, with more groups of rear code, according to the order listed in Table 1 from left to right.
b, change the content for the 4 groups (including 4 groups), then in front of the other code with “P and the previous code separated; Example: 6205-2Z/P6608-2Z/P6
c, change the content for the fourth group after the two groups, in the former group and the latter group code in the digital or textual meaning of the meaning of the table may be confused, the two code between the empty half a Chinese character distance. Example: 6208/P63V1
The meaning of the latter code
1）、Sealing ring and dust cover
a, -RS bearings on one side with a skeleton rubber seal (contact) Example: 608-RS
b, -2RS bearings on both sides with a skeleton rubber seal (contact) Example: 608-2RS
c, -RZ bearing one side with skeleton rubber seal (non-contact) example: 608-RZ
d, -2RZ bearings on both sides with skeleton type rubber seal (non-contact) Example: 608-2RZ
e、-Z bearing with dust cover on one side Example: 608-Z
f, -ZZ bearings with dust cover on both sides of the example: 608-Z
g, -RSZ bearings with skeleton type rubber seals (contact) on one side, the other side with dust cover example: 608-RSZ
h, – RZZ bearings on one side with a skeleton type rubber seal (non-contact), the other side with dust cover example: 608-RZZ
(2) keep frame structure, material change code:
a, TN — engineering plastic molded keep frame
b, J — steel plate stamping cage
c、D—-Nitriding cage

(3) tolerance level code:
Bearing tolerance grade is divided into 2, 4, 5, 6, 6X and 0, a total of 6 levels, in order from the senior to the lower level, the code were /PZ, /P4, /PS, /P6, /P6X and /PO, tolerance grade, 6X level is only applicable to tapered roller bearings; 0 for the ordinary level, in the wheel bearings code is not marked.
a, / PO tolerance level in line with the standard provisions of the 0 level, omitted from the code does not indicate Example: 6203
b, / P6 tolerance level in line with the standard provisions of the 6 level example: 6203 / P6
c, / P5 tolerance level in line with the standard provisions of the 5-level example: 6203 / P5
(4) clearance code:
Commonly used bearing radial clearance series is divided into 1 group, 2 groups, 0 groups, 3 groups, 4 groups and 5 groups, a total of 6 groups, radial clearance in order from small to large. Group clearance is commonly used in the clearance group, in the bearing code is not marked out, the rest of the clearance group in the bearing code with / C, / CZ, / C3, / C4, / CS respectively.
a, C1 clearance in line with the standard provisions of the 1 group example; 608/C1
b, C2 clearance in line with the standard provisions of the 2 groups of examples: 608/C2
c, / CO gap in line with the standard provisions of the 0 group of examples; 608/C0
d, / C3 clearance in line with the standard provisions of the 3 groups of cases; 608/C3
e, / C4 clearance in line with the standard provisions of the 4 groups of cases; 608/C4
f, / C5 clearance in line with the standard provisions of the 5 groups of cases; 608 / C5