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This standard is modified to adopt ISO1224:1984 (E) "Rolling Bearings, Instrument Precision Bearings" (English version). This standard replaces GB/T5800--1986 "Rolling Bearings, Instrument Precision Bearings". GB/T5800--2003
This standard is redrafted according to ISO1224:1984. When adopting international standards, this standard has modified the writing format in accordance with GB/T1.1-2000, and modified some symbols and terms in accordance with international and national standards. These differences are marked with a vertical single line in the margins of the clauses to which they refer.
For ease of use, this standard has also made the following editorial changes: a) The term "this international standard" is changed to "this standard"; b) The decimal point "," is used instead of the comma "," as a decimal point; c) The foreword of the international standard is deleted.
Compared with GB/T5800-1984, this standard has the following major changes: - The writing format of the standard has been modified according to the provisions of GB/T1.1-2000; the definitions of some words have been deleted, and a symbol table has been added (Chapters 3 and 4 of the 1986 edition, Chapter 3 and Table 1 of this standard); "bearing type", "bearing dimensions", "tolerances", "characteristics", "radial clearance" and "grouping of inner and outer diameters" are listed as a separate chapter (Chapters 5 and 6 of the 1986 edition, Chapters 4, 5, 6, 7.8, 9 of this standard); the outer dimensions of bearings in size series 37, 28, and 29 have been deleted (Table 1 of the 1986 edition, Table 2 of this standard); - Move the contents of Appendix A and Appendix B to the main text, and add the outer dimensions and chamfer dimensions of the hour series bearings in inches (Appendix A and Appendix B of the 1986 edition, Tables 3, 4, 9 and 10 of this standard); - Modify the tolerance grade code and tolerance value (6.1.1 and 6.1.2, Tables 2 to 5 of the 1986 edition, 7.1 and 7.2, Tables 5 to 8 of this standard);
- Modify the radial clearance value (Table 6 of the 1986 edition, Table 11 of this standard); Delete Appendix C (Appendix C of the 1986 edition). This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Rolling Bearings (CSBTS/TC98). Drafting unit of this standard: Luoyang Bearing Research Institute. Main drafter of this standard: Song Yucong.
The previous versions of the standards replaced by this standard are:—GB/T 5800—1986.
1 Scope
Rolling bearings Precision bearings for instruments
GB/T 5800-—2003
This standard specifies the characteristics, types, dimensions, tolerances and clearances, size groups, torque definitions and test conditions, and bearing yield rate limits of precision bearings for instruments with tolerance grades of 5A and 4A (hereinafter referred to as bearings). 2 Normative references
The clauses in the following documents become clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. GB/T273.3-1999 Rolling bearings Radial bearings Overall dimensions (eqvISO15:1998) GB/T274-2000 Maximum chamfer dimensions of rolling bearings (idtISO582:1995) GB/T6930-2002 Vocabulary of rolling bearings (ISO5593:1997, IDT) 3 Definitions and symbols (see Figure 1)
The definitions established in GB/T6930-2002 and the following definitions apply to this standard. See Table 1 for symbols. 3.1
Variation of bore generatrix inclination with face (inner ring, reference face)
On the tangential plane parallel to the inner ring reference end face, the total variation of the relative position of two points on the same element line of the inner hole at the maximum axial chamfer dimensions from the two end faces of the ring.
Axial runout of outer ring flange back face of assembled bearing (groove ball bearing) Seal
The difference between the maximum and minimum axial distances between the outer ring reference end face at different angular positions of the outer ring relative to a fixed point on the inner ring at a radial distance from the outer ring axis equal to half the outer ring raceway contact diameter. 3.3
Torque property torquequalify
Refers to the average torque and maximum torque of the bearing. In low-speed (near zero) or arc-limited operation, the maximum torque is often used to express it. When it is at a certain speed, the average torque can be used for judgment. 3.4
Maximum torquemaximumtorque
The maximum torque recorded in any test cycle. 3.5
Average torqueaverage torque
The arithmetic mean of the torque readings obtained during the test cycle. 3.6
Test loadtest load
GB/T 5800—2003
Axial load specified, which should coincide with the axis of rotation of the bearing. Table 1 Symbols
ACi,
rismin
ris max
Nominal inner diameter
Single inner diameter deviation
Terminology (according to the provisions of GB/T6930-2002)Single radial plane inner diameter variation
Average inner diameter variation
Nominal outer diameter
Single outer diameter deviation
Single radial plane outer diameter variation
Average outer diameter variation
Outer ring flange nominal outer diameter
Outer ring flange single outer diameter deviation
Inner ring nominal width
Inner ring single width deviation
Inner ring width variation
Outer ring nominal width
Outer ring single width deviation
Outer ring width variation
Outer ring flange nominal width
Outer ring flange single width deviation
Outer ring flange width variation
Single chamfer size (except where indicated by ri) Minimum single chamfer size (r)
Maximum single chamfer size (r)
Chamfer size of the front end faces of the inner and outer rings of angular contact ball bearings Minimum single chamfer size (r)
Maximum single chamfer size (n)
Radial runout of the inner ring of a complete bearing set
Radial runout of the outer ring of a complete bearing set
Perpendicularity of the inner ring end face to the inner hole
Variation of the inclination of the inner hole surface element line to the inner ring reference end face b Perpendicularity of the outer ring surface face to the end face"
Axial runout of the inner ring of a complete bearing set
Axial runout of the outer ring of a complete bearing set.
Axial runout of the back side of the outer ring flange of a complete bearing set. a For angular contact ball bearings, the back side of the ring is the base thrust surface. b See 3.1.
c See 3.2.
4 Characteristics
The bearings shall be manufactured according to the special tolerances specified in Chapter 7 to ensure their good performance. In addition, the bearings shall meet one or more of the following specific requirements:
a) Low or uniform torque or both during starting or rotation (this requirement does not apply to bearings with seals). b) Smooth rotation or limited vibration.
c) Bearing service rate limit.
GB/T 5800—2003
Since there are many specific requirements in the use of instruments, these specific requirements can only be determined after full consultation between the manufacturer and the user.
5 Bearing type
De-sharpening
Single row deep groove ball bearings can meet the requirements of most instruments. Such bearings can be with or without flanges, open or closed. However, in special cases, angular contact ball bearings with inseparable or separable inner rings can be selected. 6 Overall dimensions
The overall dimensions of the bearings are shown in Tables 2 to 4.
Table 2 Metric series bearings
rs min
ris min
Flange bearings
Applicable bearing types
Unit: mm
Dimension series.
GB/T 5800—2003
Table 2 (continued)
Tis min
Flange bearing
Applicable bearing types
Open type, closed type
Open type, closed type
Open type, closed type
Open type, closed type
Open type, closed type
Open type, closed type
Open type, closed type
Open type, closed type
Open type, closed type
Open type, closed type
Open type, closed type
Open type, closed type
Open type, closed type
Open type, closed type
Open type, closed type
Open type, closed type
Open type, closed type
Open type, closed type
Open type, closed type
Open type, closed type
Unit is mmWww.bzxZ.net
Dimension series "
rs min
Table 2 (continued)
Tia min
Flange bearings
aThe dimension series for flangeless bearings is specified in GB/T273.3-1999. Table 3
rs min
Time series bearings
ris min
GB/T5800-2003
Unit: millimeter
Applicable bearing types
Open type, closed type
Open type, closed type
Open type, closed type
Open type, closed type
Open type, closed type
Flange bearings
Dimension series"
Unit: millimeter
Applicable bearing types
Open type, closed type
Open type, closed type
GB/T5800—2003
aApplicable only to open bearings with flange
T's min
Table 3 (continued)
Ts mia
Time series bearings
Tia min
Flanged bearing
Flanged bearing
Unit: millimeters
Applicable bearing types
Open type", closed type
Open type, closed type
Open type, closed type
Open type", closed type
Unit: inches
Applicable bearing types
Open type, closed type
Open type, closed type
aApplicable only to open bearings with flange.
7 Tolerances
7.15 Grade A tolerances
rs min
Table 4 (continued)
ria min
Flanged bearings
5The inner ring tolerance values of grade A tolerance bearings are specified in Table 5, and the outer ring tolerance values are specified in Table 6. Table 5 Inner ring
a includes this dimension.
Upper deviation
Lower deviation
Upper deviation
Lower deviation
Upper deviation
Lower deviation
GB/T5800—2003
Unit is inch
Applicable bearing type
Open type", closed type
Open type, closed type
Open type, closed type
Open type., closed type
b The total width tolerance of the inner ring of the matched or assembled bearing is 0~200 μm (-0.007 9 in) multiplied by the number of bearings installed. C The maximum allowable value (Sa nax) of the inner ring reference end face to the inner hole runout is: d:
Sa mex =Sal max 2(B-2rs max)Sal max See Table 5, d: inner ring groove diameter. max
GB/T5800—-2003
Upper deviation
Upper deviation
Includes this dimension.
Upper deviation
-2.4+0. 4
Table 6 Outer ring
V, and Vpmp
Open type Closed type
Upper deviation
max|maxjmax maxmax
b The total width tolerance of the outer ring of the bearing to be matched or assembled is 0～—200 μm (—0.0079in) multiplied by the number of bearings installed 7.24A-grade tolerance
4The inner ring tolerance values of A-grade tolerance bearings are specified in Table 7, and the outer ring tolerance values are specified in Table 8. Table 7
Includes this dimension,
Upper deviation
Lower deviation"Upper deviation
Lower deviation
bThe total width tolerance of the inner ring of the matched or assembled bearing is 0~Inner ring
Lower deviation
Upper deviation
-200 μm (0.0079in) multiplied by the number of bearings installed. The maximum allowable value (Sanax) of the inner ring reference end face to the inner hole runout is: Sd mex =Sal mx2(B-2rs max)
Sal max See Table 7, d: inner ring raceway diameter. Table 8
0.079*0.709
0. 7091.181
Upper deviation
Includes this dimension,
Lower deviation
Upper deviation
Lower deviation
Upper deviation
Lower deviation
V and Vop
Open type Closed type
b The total width tolerance of the outer ring of the matched or assembled bearing is 08
Lower deviation
max|max maxmaxmax
-200!m (0.0079in) multiplied by the number of installed bearings. Deviation
7.3 Chamfer size limit
The minimum single chamfer size (rsmin and r1smin) is shown in Table 2, Table 3 and Table 4. The maximum single chamfer dimensions (rsmax and r1smax) of metric series bearings are specified in GB/T274-2000. The maximum single chamfer dimensions (rsmax and rismax) of metric series bearings are shown in Tables 9 and 10. 9 Metric series bearings
rs max
GB/T5800—2003
Unit: mm
ris max
GB/T 5800—2003
Metric series bearings
rs nax
Unit: inch
ris max
8 Radial clearance
The radial clearance of single-row deep groove ball bearings is shown in Table 11. Table 11
Radial clearance of single-row deep groove ball bearings
a includes this dimension.
Grouping of inner and outer diameters
When the shaft and housing require matching, the bearings can be divided into specific size groups according to the following provisions: Method of determining size
1) Outer diameter: the maximum diameter actually measured.
2) Inner diameter: the minimum diameter actually measured.
Unless otherwise agreed, each basic size is divided into two groups of the same range. b)
GB/T 5800—2003
In view of the difficulty in determining the measurement relationship between the manufacturer and the user, the grouping is only used as a reference for matching and should not be used as an absolute division of size in marginal cases.
Unless there is a special agreement with the manufacturer, the manufacturer will provide random and undetermined size groups. 10 Torque test conditions
10.1 Overview
Ball bearing torque can be defined as "rotational torque" and "starting torque", the definitions of which are given in 06.01. The standard unit of torque is micro Newton meter (uN·m), other units may also be used. Unless otherwise specified, the axis of the bearing is in a plumb position. 10.2 Test conditions
10.2.1 Environmental conditions
The test shall be carried out in a controlled clean environment and on a vibration-free base, with the temperature maintained at 20℃~25℃ and the relative humidity maintained below 55%.
10.2.2 Bearing test preparatory conditions
Before the test, the bearing shall be demagnetized and thoroughly cleaned in a properly filtered clean mineral solvent. The bearing shall be lubricated with a specified amount and quality of lubricant and rotated slowly to distribute the lubricant evenly. 10.2.3 Test load
The axial test load (see 3.6) is specified as follows: a) Bearing outer diameter ≤8 mm (0.3125 in): 0.75N. b) Bearing outer diameter >8mm (0.3125 in): 1.5N or 4N as agreed. 10.2.4 Test scope
The test method shall ensure that the non-filled groove ball bearings are within the specified torque limits in both positive and negative rotation directions and in both loading directions; for angular contact ball bearings and other bearings that only bear unidirectional axial loads, the torque requirements are specified only in the direction of load.
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