This standard is formulated for the first time. This standard specifies the structural type, overall dimensions, technical requirements, measurement methods, inspection rules and markings, rust prevention, packaging, etc. of flat ring type and bolt type double row full complement cylindrical roller bearings. This standard is applicable to the production inspection and user acceptance of finished roller bearings. JB/T 7754-1995 Rolling bearings Double row full complement cylindrical roller bearings JB/T7754-1995 standard download decompression password: www.bzxz.net

JB/T7754--1995
This standard is formulated for the first time. The flat-gear circular and bolt-type double-row full-complement cylindrical roller bearings specified in this standard do not have this structure in the current international standards. The bearing structures specified in the international standards ISO6278-1980 "Roller and Needle Bearings Dimensions" and IS(7063-1982 "Roller and Needle Bearing Tolerances" are similar to those specified in this standard, except that the dimensions and tolerances of roller and needle bearings with needle rollers as rolling elements are used. This standard refers to ISO7063 in the auxiliary bearing tolerance part. "Code Method" and JB/T2974-93 "Rolling Bearing Codes
The bearing codes in this standard are compiled according to GB/T272-93 "Supplementary Provisions for Rolling Bearing Methods", except that the post-codes of the structural changes are supplemented. This standard is proposed by the National Technical Committee for Rolling Bearing Standardization. This standard is under the jurisdiction of the Luoyang Bearing Research Institute of the Ministry of Machinery Industry. The main drafting units of this standard are: Mechanical Industry Bureau Yang Bearing Research Institute, Xiantao Bearing Factory. The seven drafters of this standard are: Xu Wenbao, Liu Jianzhi. 631
1 Scope
Mechanical Industry Standard of the People's Republic of China
Rolling Bearings
Double-row Full Complement Cylindrical Roller Bearings
JB/T 7754
This standard specifies the structural type, overall dimensions, technical requirements, measurement methods, inspection rules and markings, rust prevention, packaging, etc. of double-row full-complement cylindrical roller bearings (hereinafter referred to as roller bearings) with retaining rings and bolts. This standard is applicable to the production inspection and acceptance of finished roller bearings. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through their use in this standard. All versions are valid when this standard is published. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards: GB 197.-81
Ordinary threads
Tolerances and fits (diameter 1~~355mm)
GB/T 272...93
Rolling bearings
GB 307. .--84
CB 307. 3--84
GB 4199-84
Rolling bearings
Rolling bearings
Rolling bearings
GB/ 4604-
CB 6930 ---86
GB 859788
JR 1255... -91
Code method
Tolerance measurement method
-General technical requirements
Tolerance definition
Rolling bearings
Rolling bearings
Radial clearance
Rolling bearings
Technical conditions for heat treatment of rolling bearing parts of high carbon chromium bearing steel JB/T 2974-
JB/T 3573--93
JB/T 3574-- 92
JB/T 6641- 93
JB/T 7051
Z13 J11 020---89
Rolling bearings
Rolling bearings
Supplementary provisions for the code method
Methods for measuring and evaluating radial clearance
Rolling bearings
Product marking
Residual magnetism of rolling bearings and its evaluation method
Methods for measuring and evaluating the surface roughness of rolling bearing parts Inspection rules for rolling bearings and their commercial parts 2BJ36001-86 Quality standard for carburizing heat treatment of rolling bearing parts 3 Definitions
This standard adopts The definitions of terms and tolerances are specified in (GB6930 and (G134199). 4 Symbols
B: Nominal width of bearing including flat ring or bolt A: Single width deviation of bearing
BI: Bolt length of bolt type roller bearing
Approved by the Ministry of Machinery Industry on June 16, 1995
Implementation on July 1, 1996
Aal: Bolt length deviation
JB/T7754.-1995
: Distance between radial oil hole of bolt and flat =A: Single width deviation of outer ring
C1: Axial distance d of flat retaining ring protruding from outer ring end face; Inner ring nominal inner diameter
Admr: Single plane average inner diameter deviation
di: Bolt nominal diameter
』: Single bolt diameter deviation
Flavor: Flat retaining ring outer diameter
ID: Roller bearing nominal outer diameter
An: Single plane average outer diameter deviation
(: Bolt thread nominal diameter Diameter
: Length of bolt thread
W: Nominal chamfer of outer ring
ismt: Minimum one-way chamfer
: Nominal chamfer of inner diameter of flat retaining ring
rsnn: Minimum single chamfer of r
K: Radial runout of outer ring of complete roller shaft 5 Technical requirements
5.1 Structural type and supplementary code
5.1.1 The structural types of roller bearings specified in this standard are: NUFR+ type
NUTR+X Type
Flat-ring double-row full complement cylindrical roller bearing (see Figure 1); Flat-ring double-row full complement cylindrical roller bearing with a cylindrical outer ring surface (see Figure 1); Bolt-type double-row full complement cylindrical roller bearing (see Figure 2); NUKR... Type..
NUKR·X-bolt-type double-row full complement cylindrical roller bearing with a cylindrical outer ring surface (see Figure 2). NUTR·type
NUTR-.-X type
Flat-gear remote roller bearing
NUKR·type
JB/T7754-1995
Figure 2 Bolt-type roller bearing
NUKRX type
5.1.2 When the structure of the roller bearing is changed, in addition to adding the post-position code according to the provisions of GB/T272 and JB/T2974, the provisions of this standard shall apply under the following circumstances:
a) The roller ends are sealed with multiple F springs, and the post-position code \-2PS\ is added. For example: NUKR10-2PS, NUKR40-2PSXb) For bolt-type roller bearings, the end of the bolt shaft has an inner hole, and the lip position code "SK" is added, for example: NUKR4SKNEKR 40 SKX: For bolt-type roller bearings, both ends of the roller are sealed with multiple circlips, the end of the bolt shaft has a hexagonal hole, and the suffix code ~-2\S\, \SK\ is added. It is simplified to \-2PSK\, for example: NUKR40-2PSK. 5.1.3 Marking example
Rolling bearing NUTR2562JB/T7754-1995
Rolling bearing NUKR47XJB/T7754-1995 5.2 Appearance
5.2.1 The outer dimensions of retaining ring type roller bearings are listed in Table 1, Table 2, 5.2.2 The outer dimensions of bolt type roller bearings are listed in Table 3. Table 1 Flat ring type roller bearing (light series) Overall dimensions Small roller bearing code
NUTR type
NUTR 15
NUTR 1?
NUFIR 20
NUTR 25
NUTR 30
NUTR 35
NUFR A5
NUTR 50
NUTR.-X type
NUTR 15 X
NUTR 17 X
NUTR 20 X
NUTR 25 X
NUTR 30 X
NUTR 35 X
NUTR M0 X
NUTR 45X
NUTR50X
NUTR·Type
NUTR1542
NUTR 1747
NUTR 2052
NUIR 2562
NUITR 3072
NUTR 3580
NUTR 4090
Jun wheel bearing code
JB/T 7754--.1995
Table 2 Dimensions d of flat-ring type roller bearings (heavy series)
NUIR·X type
NUTR 1542 X
NUTR 1747 X
NUTR 2052 X
NUTR 2562 X
NUTR 3072 X
NUTR 3580 X
NUTR 4090 X
NUTR 45100
NUTR 50110
Roller bearing code
NUKR··type
NUKR35
NUKR10
NUKR47
NUKR52
NUKR 62
NUKR 72
NUKR 80
NUKR 90
5.3 Materials and hardness
NUTR 45100 X
NUTR 50110 X
3 Dimensions of bolt type roller bearings
NUKRX type
NUKR 35 X
NUKR 40 X
NUKR 47 X
NUKR52X
NUKR 62 X
NUKR 72 X
NUKR 80 X
NUKR 90 X
The roller bearing is made of GCr15 steel or G20CrMo and its carburized bearing steel. When GCr15 steel is used, the surface hardness of the inner and outer rings and retaining rings is 58~～62HRC. When G20CrMo and other carburized bearing steels are used, surface carburizing heat treatment is required, and the surface hardness is 58~62HRC, and the core hardness is 35~40HRC; the effective depth of the surface carburized layer is 1.3~1.9mm for the outer ring, and 1.0~1.6mm for the raceway surface and guide rib of the bolt.
5.4 Tolerance
5.4.1 Flat retaining ring type roller bearing
a) The outer ring tolerance shall be in accordance with the provisions of Table 4;
b) The inner ring tolerance shall be in accordance with the provisions of Table 5.
NUTR type
Upper deviation
Lower deviation
Outer ring tolerance
NUTR.X type
Upper deviation
Upper deviation
Lower deviation
5.4.2 Bolt type roller bearing
a) Outer ring tolerance shall be in accordance with the provisions of Table 4:
JB/T 7754
Table 5 Inner ring tolerance
Upper deviation
b) Bolt diameter and length tolerance shall be in accordance with the provisions of Table 6; c) Bolt thread tolerance shall be in accordance with the provisions of 6g grade tolerance in GB197: Lower deviation
Table 6 Bolt diameter and length tolerance
5.5 Surface roughness
Outer ring surface roughness shall be in accordance with the provisions of Table 7.
Upper deviation
Lower deviation
Surface roughness of outer ring
NUTR type
NUKR type
Surface roughness R of inner ring and retaining ring (non-guide surface) is 0.8um. ​​Surface roughness of bolts shall be in accordance with the provisions of Table 8.
5.6 Radial clearance
Surface roughness of bolts
NUTR-.X type
NUKR·X type
Surface at d diameter
Lower deviation
Lower deviationbzxz.net
Thread surface
Radial clearance of roller bearings shall be in accordance with the provisions of Table 4 of GB/T4604 for cylindrical roller bearings with cylindrical bores, in which d is used for bolt-type roller bearings, instead of the inner diameter d of the yoke bearing, and the table shall be selected.
5.7 Appearance
The appearance quality of roller bearings shall comply with the provisions of GB307.3. 5.8 Residual magnetism
The residual magnetism limit of roller bearings shall not exceed the provisions of JB/T6641. 5.9 Others
If the subscriber has special requirements, it can be determined through consultation with the manufacturer. 636
6 Measurement method
JB/T 7754
6.1 The measurement of roller bearing tolerance shall comply with the provisions of GB307.21995
6.2 The measurement of roller bearing surface roughness shall comply with the provisions of JB/T7051. 6.3 The measurement of roller bearing radial clearance shall comply with the provisions of JB/T3573. 6.4 The inspection of roller bearing parts hardness and heat treatment quality shall comply with the provisions of JB1255. The inspection of carburized layer depth and quality of carburized parts shall comply with the provisions of ZBJ36001.
6.5 The appearance inspection of roller bearings shall be in accordance with the provisions of GB307.3. 6.6 The determination of residual magnetic extreme value shall be in accordance with the provisions of JB/T6641. 7 Inspection rules
7.1 The finished roller bearings shall be inspected by the quality management department of the manufacturer, and a quality certificate shall be attached after passing the inspection. 7.2 Sampling and determination of bearing inspection shall be in accordance with the provisions of ZBJ11020 Class A rolling bearing finished products. 8 Marking, rust prevention and packaging
8.1 Labeling
In order to facilitate the identification of bearings, each set of bearings shall be marked with permanent marks such as bearing code and manufacturer code. The position, marking method and requirements of the marking shall be in accordance with the provisions of JB/T3574.
8.2 Rust prevention and packaging
The cleaning, rust prevention, inner packaging, outer packaging and packaging marking of finished roller bearings shall be in accordance with the provisions of (B8597.63373. 5.8 Residual magnetism
The residual magnetism limit of roller bearings shall not exceed the provisions of JB/T6641 5.9 Others
If the subscriber has special requirements, it can be determined through consultation with the manufacturer. 636
6 Measurement method
JB/T 7754
6.1 The measurement of roller bearing tolerance shall be in accordance with the provisions of GB307.2 1995
6.2 The measurement of roller bearing surface roughness shall be in accordance with the provisions of JB/T7051. 6.3 The measurement of roller bearing radial clearance shall be in accordance with the provisions of JB/T3573. 6.4 The inspection of roller bearing parts hardness and heat treatment quality shall be in accordance with the provisions of JB1255. The inspection of carburized layer depth and quality of carburized parts shall be in accordance with the provisions of ZBJ36001.
6.5 The appearance inspection of roller bearings shall be in accordance with the provisions of GB307.3. 6.6 The determination of residual magnetic extreme value shall be in accordance with the provisions of JB/T6641. 7 Inspection rules
7.1 The finished roller bearings shall be inspected by the quality management department of the manufacturer, and a quality certificate shall be attached after passing the inspection. 7.2 Sampling and determination of bearing inspection shall be in accordance with the provisions of ZBJ11020 Class A rolling bearing finished products. 8 Marking, rust prevention and packaging
8.1 Labeling
In order to facilitate the identification of bearings, each set of bearings shall be marked with permanent marks such as bearing code and manufacturer code. The position, marking method and requirements of the marking shall be in accordance with the provisions of JB/T3574.
8.2 Rust prevention and packaging
The cleaning, rust prevention, inner packaging, outer packaging and packaging marking of finished roller bearings shall be in accordance with the provisions of (B8597.63373. 5.8 Residual magnetism
The residual magnetism limit of roller bearings shall not exceed the provisions of JB/T6641 5.9 Others
If the subscriber has special requirements, it can be determined through consultation with the manufacturer. 636
6 Measurement method
JB/T 7754
6.1 The measurement of roller bearing tolerance shall be in accordance with the provisions of GB307.2 1995
6.2 The measurement of roller bearing surface roughness shall be in accordance with the provisions of JB/T7051. 6.3 The measurement of roller bearing radial clearance shall be in accordance with the provisions of JB/T3573. 6.4 The inspection of roller bearing parts hardness and heat treatment quality shall be in accordance with the provisions of JB1255. The inspection of carburized layer depth and quality of carburized parts shall be in accordance with the provisions of ZBJ36001.
6.5 The appearance inspection of roller bearings shall be in accordance with the provisions of GB307.3. 6.6 The determination of residual magnetic extreme value shall be in accordance with the provisions of JB/T6641. 7 Inspection rules
7.1 The finished roller bearings shall be inspected by the quality management department of the manufacturer, and a quality certificate shall be attached after passing the inspection. 7.2 Sampling and determination of bearing inspection shall be in accordance with the provisions of ZBJ11020 Class A rolling bearing finished products. 8 Marking, rust prevention and packaging
8.1 Labeling
In order to facilitate the identification of bearings, each set of bearings shall be marked with permanent marks such as bearing code and manufacturer code. The position, marking method and requirements of the marking shall be in accordance with the provisions of JB/T3574.
8.2 Rust prevention and packaging
The cleaning, rust prevention, inner packaging, outer packaging and packaging marking of finished roller bearings shall be in accordance with the provisions of (B8597.6337
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