JB/T 6643-1993 Rolling bearing four-point contact ball bearing axial clearance

JB/T 6643-1993 Axial clearance of rolling bearings four-point contact ball bearings JB/T6643-1993 Standard download and decompression password: www.bzxz.net

J11 | | tt | | JB | -05-07 Released
Axial Clearance
Implemented on 1994-01-01
Ministry of Machinery Industry of the People's Republic of China
Released
People's Republic of China Machinery industry standards
Rolling bearings
Four-point contact ball bearings
Axial clearance
1 Subject content and scope of application
JB/T 664393|| tt||This standard specifies the axial clearance value of general-purpose four-point contact ball bearings (d≤300mm) with a contact angle of 35. This standard is applicable to the inspection of finished bearings by bearing manufacturers and the acceptance of finished bearings by subscribers. . 2 Reference standards
GB272 rolling bearing code method
GB6930 rolling bearing vocabulary
3 definitions
The definition of axial clearance specified in this standard is in accordance with Article 05.08.03 of GB6930 Provisions. Axial clearance value
The axial clearance value of four-point contact ball bearings is as specified in the table below. μm
nominal inner diameter d
super effective
60||tt| |80
300|| tt||5 Marking of axial clearance
5.1 Marking method
46|| tt||56
2 groups
max||tt ||55
116| |tt||136
0 group
106|| tt||126
275||tt| |min
176| |tt||196
105||tt ||136
4 sister
When four-point contact ball bearings are manufactured according to Group 0 axial free inserts, they are not marked in the bearing code. Tour group code. When other groups of axial travel are used, it shall be expressed according to the provisions of GB272.
5.2 Logo Example
Approved by the Ministry of Machinery Industry on 1993-05-07
Implemented on 1994-01-01
JB/T6643-93
QJ214: Indicates the 0-level tolerance QJ214 bearing with axial free embedment in group 0. QJ214/P52 represents P5 level tolerance QJ214 bearings with 2 sets of axial clearance. JB/T6643—93
Appendix A
Measurement method of axial clearancewww.bzxz.net
(Supplement)
A1 four-point contact ball bearing axial clearance Axial travel inspection instrument measurement. The actual measured clearance value of A2 under the measurement load should be deducted from the axial clearance increase in Table A1 to obtain the axial clearance of the bearing. Table A1
nominal inner diameter
exceeds
measurement load
Note: The values ??in the table do not include the accuracy error of the instrument used. 2 groups
travel
increase
amount
0 group
3 groups
4 groups
4 || tt | For double-rate inner rings or double-half outer rings, the two half-rings should be clamped in the axial direction during measurement to achieve a state where they can be regarded as a set of figures. A3 should be used to measure the clearance using a measurement method different from that specified in this standard. When there is any dispute over the value, the instrument measurement value specified in this standard shall prevail. Additional notes:
This standard is proposed by the National Rolling Bearing Standardization Technical Committee. This standard is under the jurisdiction of Luoyang Bearing Research Institute of the Ministry of Machinery Industry, and Wafangdian Bearing Factory is responsible for drafting this standard. The main drafter of this standard is Lin Xiuqing,
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