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
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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 diameterbzxZ.net 』: 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 deviation 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 Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.