JB/T 8878—2001 This standard adopts ISO 3245:1997 "Rolling bearings - Needle roller bearings without inner rings and pressed outer rings - Dimensions and tolerances" in a non-equivalent manner. This standard is a revision of JB/T 8878—1999 "Technical conditions for rolling bearings with pressed outer ring needle rollers". Some symbols, definitions, hardness requirements, outer ring tolerances, etc. have been changed during the revision. This standard specifies the technical conditions for general-purpose needle roller bearings without inner rings and pressed outer rings manufactured in accordance with GB/T 290—1998 "Rolling bearings with pressed outer ring needle rollers with dimensions". This standard applies to the production, inspection and user acceptance of pressed outer ring needle roller bearings. This standard was first issued in 1989 as ZB J11 019—1989, and the standard number was adjusted to JB/T 8878—1999 in April. This is the first revision. JB/T 8878-2001 Technical conditions for drawn cup needle roller bearings for rolling bearings JB/T8878-2001 Standard download decompression password: www.bzxz.net

ICS 21. 100. 20
Mechanical Industry Standard of the People's Republic of China
JB/T8878—2001
neq ISO 3245: 1997
Rolling bearings
Drawn up needle roller bearings
Technical conditions
Rolllng bearings--Drawn up needle roller bearings Specifications2001-05-23 Issued
China Machinery Industry Federation
2001-10-01 Implementation
JB/T8878-2001
This standard adopts TS03245:1997 "Motor bearings without inner space, stamped outer ring close-fitting needle bearings-outer dimensions and tolerances standard" and the tolerances specified in TS03245 are consistent with TS03245, and other technical conditions not specified in the ISO standard are supplemented. This standard is a revision of /T8878--1999 (Technical conditions for rotary bearings with stamped outer rings). Compared with the old 8878-1999, this standard mainly makes the following adjustments: Change the symbols F and F to F and A and specify their definitions Change the variable 664I1V0.1 to 664IIVT: Change the outer width tolerance to product, :
Cold cross end tolerance The outer diameter function "needle roller set minimum inner diameter" is changed to "needle roller set minimum inner diameter -2 m: a common forbidden band is added to the shaft and bearing seat hole size tolerances. This standard replaces Appendix A of JB 8878-1999 from the date of implementation. Appendix B of the standard is the appendix of the standard. This standard is produced and compiled by the National Technical Committee for Standardization of Bearings. The drafting unit of this standard is Geyang Bearing Research Institute. The main person in charge of this standard is Li Feixue. This standard was first issued in 1989 as 11019.--1989, and the standard number was adjusted to B Hall 78-1999 in April 1999. This is the first European replacement. Machinery Industry Standard of the People's Republic of China Rolling Bearings Drawn Outer Ring Needle Roller Bearings Technical Conditions Roulng BearlngsDriwn up ueedleroller bearingsSpecificntions1Scope
JB/T 8878-Z001
neq1SO3245:1997
Generation J8878-1994
This standard specifies the technical conditions for general-purpose needle roller bearings without inner ring and drawn outer ring manufactured in accordance with GBT290. This standard applies to the production, inspection and user acceptance of drawn outer ring needle roller bearings. 2 Reference standards
The provisions contained in the following standards shall constitute or be the provisions of this standard through their use in this standard. When this standard is published, the versions shown are valid. All standards will be revised mechanically, and the parties using this standard should explore the possibility of using the latest version of the underlined standardsGB/T 290..-1998
GB/T 19571981
GB/T 4340.11999
GD/T 8597—1988
GB/T13237—1991
JB/T3574—1997
JB/I8921-1999
3 Symbols and definitions
Dry rolling bearings Drawn outer ring Needle roller bearings Dimensions Smoothness Limits Plasticity
Gold and white Vickers hardness test Part 1: Test methods Rolling bearing packaging
High-quality carbon slurry structural steel cold-rolled thin steel plate and steel strip Rolling bearing product marking
Inspection rules for floating bearings and their commodity parts This standard uses the following symbols and definitions. Other symbols in this standard are based on GB/T290. 3.! Roller group nominal internal weight, F: The diameter of the theoretical cylinder inscribed with all needle rollers. 3.2 Actual inner diameter of needle roller set, F: The diameter of the circular body inscribed with the needle roller set. : The actual inner diameter of the needle roller set refers to the diameter of the body when a sample is inserted into the inner hole of the needle roller set, at least in the radial direction of the bearing L.
3.3 Actual inner deviation of the needle roller set, 4F: The difference between the actual inner diameter of the needle roller set and the nominal inner diameter, AF..-F.-F
A Technical requirements
4.1 Materials and hardness
Stamping outer kitchen can be made of 10 or 08 high-quality cold-rolled steel plates (strips) with a surface quality not less than II and a drawing grade not less than P as specified in GA/T13237. After heat treatment, the hardness of its commercial surface shall not be less than 664HV1. Approved by China Machinery Industry Federation on May 23, 2001, implemented on October 1, 2001
4.2 Tolerances
4.2.1 The tolerance table for the nominal inner diameter F of the needle roller set is as follows.1
4.2.2 The tolerance of the punched outer tear width C is mm.4.3 Others
4.3.1 The outer ring of the bearing should not have any scratches or marks. Upper front
Lower front
4.3.2 For punched outer ring needle roller bearings with seals, the material, structural shape and dimensional tolerance of the seal ring should comply with the provisions of the product sample.4.3.3 The bearing should be activated after being pressed into the ring gauge.4.3.4 The requirements for the drawing of the shaft and the outer hole that match the cat bearing are shown in Appendix A (Standard Appendix)4.3.5 The recommended installation method for the use of the cat bearing is shown in Appendix B (Indicative Appendix)5 Inspection Method 5,】F-, the inspection is to put the bearing into a hardened copper ring gauge with a specific inner diameter, and then use a gauge with "over-end" and "stop-end" to test: The size and tolerance of the ring gauge are in accordance with the provisions of Table 2, and the size and tolerance of the plug gauge are in accordance with the provisions of Table 3. Table 2: The nominal inner diameter of the ring gauge is calculated as follows: The maximum allowable inner diameter of the ring gauge is P minus the upper value of N6. Ring tolerances are in accordance with GB/T1957 TT8 tolerances. Ring gauge thickness 5. 2 The tolerance of the bearing width is measured with a vernier caliper, JB/T BBT#—2001
Base nominal outer diameter
Production_ +0.014
5.3 Hardness test method meets the requirements of GB/T4340.1. 6 Marking
The marking of the stamped outer circumference needle bearing shall comply with the provisions of 3574. Inspection and purchase
The inspection and purchase of bearings shall comply with the provisions of JA/T892T. 8 Packaging
The packaging of bearings shall comply with the provisions of GB/T8597. Stop
F, +0.030
F+0036
E, +0.043
F, +0.052
F, +0.062
Race tolerance
This GT17bzxz.net
publicly recommended
AIShafts that match bearings
JB/T8878-2001
Attached A
(Standard record]
Technical requirements for shafts and housing holes that match bearingsAt1The shaft must be matched with a surface hardness of not less than 5SHRCA1.2The shaft must match the surface roughness R of the surface to be 0.2m.A13The dimensional tolerance of the shaft collar is h5 (h6)
A1.4The shaft The tolerances of the mating surfaces shall not exceed 50% of the dimensional tolerance of the shaft. A2 The surface roughness of the outer shell hole mating with the bearing A1 The surface roughness of the mating surface of the outer shell hole is mAZ.2 The dimensional tolerance of the outer shell is based on the material of the seat selected according to Table A1. Table AI The material of the outer shell is steel or light alloy with a thickness of less than 6 lhm. The dimensional tolerance of the outer shell is AZ.3 The roughness and roundness of the mating surface of the outer shell hole shall not exceed 59% of the dimensional tolerance of the shell, 3E/T $78—2001
Appendix B
(Reminder)
Recommended safety method
To avoid deformation and cracking of the parts caused by stamping and to prevent the positive sliding of the needle from being damaged, do not use manual labor when installing the bearing. The outer surface of the needle bearing should be pressed with a pressure gauge and special installation tools for installation (see Figure B1). When installing, the marking of the needle bearing should face upward. Special assembly tool
0-D-(0.2-03) m
~F_-0.025mm
It should be determined by the installation position.
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