JB/T 3370-1991 Rolling bearings Universal joints Dimensions and tolerances of cylindrical roller bearings without inner ring JB/T3370-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Rolling Bearings
Universal Joint Cylindrical Roller Bearings without Inner Rings
Dimensions and Tolerances
Subject Content and Scope of Application
JB 3370-91
Replaces JB337083
This standard specifies the dimensions and tolerances of cylindrical roller bearings without inner rings (hereinafter referred to as bearings) for cross-shaft universal couplings used in rolling machinery, lifting and transportation machinery and other heavy machinery. This standard applies to the manufacturing inspection of finished bearings by bearing manufacturers and the acceptance of finished bearings by users. 2 Reference standards
GB275 Fit of rolling bearings with shafts and housings GB 307.1
GB 307.3
GB1801bzxz.net
GB4199
GB6930
3 Symbols
Tolerances of rolling bearings
General technical requirements
Rolling bearings
Tolerances and fits Dimensions up to 500 mm Tolerances and fits of holes and shafts Definitions of rolling bearing tolerances
Glossary of rolling bearings
Type 604000
Approved by the Ministry of Machinery and Electronics Industry on June 25, 1991 604000 RS Model
1992-07-01 implementation
D: nominal outer diameter of bearing;
D,: outer diameter of outer ring flange;
Fw: overall inner diameter of roller;
C: nominal width of outer ring;
T: bearing width;
H: width from inner side of flange to bottom;
Ho: bearing bottom width;
M: thread diameter of oil filling hole;
: liner thickness.
4 bearing model representation method
JB 3370-91
The bearing model consists of two parts: numbers and letters. The letter part is the additional code when the bearing seal is rubber seal ring type. The number part represents the bearing structure, type, diameter series and inner diameter respectively. Example: 60
Additional code for rubber seal
Overall inner diameter code for roller
Diameter series code
Bearing type code
Bearing structural feature code
Note: The overall inner diameter code for roller is the integer closest to the quotient obtained by dividing the diameter of the inscribed circle of the rolling body by 5. 5 Overall dimensions
The overall dimensions of bearings with steel sleeve groove seals (604000 type) and rubber seal ring seals (604000RS type) shall be in accordance with the provisions of Table 1. Table 1
Bearing model
Type 604000
604906
604907
60490 8
604909
604910
601912
604914
604915
604916
604917
604920
604922
604925
604932
604938
604000
604906RS
60490 7RS
604908RS
604909RS
604910RS
604912RS
604914RS
604915RS
604916RS
604917RS
604920RS
604922RS
604925RS
604932RS
604938RS
604000|604000RS
Note: 1) The type of rubber seal can be determined by negotiation between the bearing manufacturer and the user. 45
M10×1
[M10x]
2) The "T" in the table is an approximate size, which needs to be finally determined when the bearing is designed. When the user selects it, he should contact the design department of the bearing manufacturer in advance. 430
6 Nylon pad
JB3370—91
The thickness of the nylon pad installed at the bottom of the bearing ring is 2~4mm, which is selected by the user when adjusting the axial clearance according to the installation size of the bearing and the length of the +-shaped shaft journal.
Tolerance value
7.1 The tolerance of the overall inner diameter of the roller shall comply with the provisions of Table 2. Table 2
Overall inner diameter of the roller
Upper deviation
Lower deviation
7.2 The outer diameter tolerance of the bearing shall comply with the provisions of Table 3. Nominal outer diameter
Upper deviation
Lower deviation
7.3 The width tolerance from the inner side of the flange to the bottom shall comply with the provisions of Table 4. Table 4
Upper deviation
Lower deviation
7.4 The tolerance zone at the cross shaft journal and the overall inner diameter of the roller shall comply with h5, and the tolerance zone at the housing hole and the outer diameter of the bearing shall comply with N6. The technical requirements for the +-shaped shaft journal and the housing and the bearing shall comply with the provisions of GB275. Additional remarks:
This standard was proposed by the National Technical Committee for Standardization of Rolling Bearings. This standard is under the jurisdiction of the Luoyang Bearing Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by Luoyang Bearing Factory. The drafter of this standard is Qu Yuyun.
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