JB/T 8877—2001 This standard is a revision of JB/T 887—1999 "Technical conditions for rolling bearings and needle roller combination bearings". During the revision, the structure type of needle roller and full complement thrust ball combination bearing was added, and all locking ring structures were cancelled; the symbols and definitions were modified; the material, hardness requirements and residual magnetism detection methods were supplemented; and the commonly used radial clearance classification was specifically specified. This standard specifies the technical conditions of the following five types of needle roller combination bearings: needle roller and full complement thrust ball combination bearings; needle roller and thrust ball combination bearings; needle roller and thrust cylindrical roller combination bearings; needle roller and angular contact ball combination bearings; needle roller and three-point contact ball combination bearings. This standard applies to the production, inspection and user acceptance of needle roller combination bearings. This standard was first issued in 1987 as ZB J11 010—1987, and the standard number was adjusted to JB/T 8877—1999 in April 1999. This is the first revision. JB/T 8877-2001 Technical conditions for rolling bearings and needle roller bearings JB/T8877-2001 Standard download decompression password: www.bzxz.net

JCS 21.100.20
Machinery Industry Standard of the People's Republic of China
JB/T8877-2001
Rolling bearings
Needle roller bearings
Technical conditions
Rolling bearings-Combined meedle roller bearingsSpecifications2001-05-23Promulgated
China Machinery Industry Federation
2001-10-01Implementation
JB8877-2001
This standard is a revision of 1B8877-1999 "Rolling bearings-Needle roller bearings, Technical conditions 3". This standard is compared with J3/8877-1. The following changes have been made to the main transformer: 1. Supplement, NX, NX··2 type needle roller and full complement thrust ball combination draw bearing structure, eliminate all the locking cycles in the original standard:
Symbols and definitions have been changed:
Material and hardness requirements have been supplemented;
First, the common radial clearance identification group of combined bearings has been defined: F, the inspection method and table roughness, radial clearance, residual magnetism detection method have been supplemented:
Marking, rust and packaging requirements have been supplemented,
This standard replaces JB/8977-1999 from the date of implementation. This standard is proposed and managed by the National Rolling Bearing Standardization Technical Committee. The units of this standard are: Luoyang Bearing Research Institute, Zhenjiang Feiya Bearing Co., Ltd., and the main drafters of this standard are: Liu Feixue, Song Xiaozu. This standard was first issued in 1987 as ZBJ11010-1987, and was revised for the first time in April 1999 as JBJ8877-199.
China Machinery Industry Standard
Rolling Bearings
Needle Roller Combined Bearings
Technical Conditions www.bzxz.net
RollingbearinysCombined needlcrallcrbearings1 Scope
sperificatlons
18/T8877300
Generation JBT88771999
This standard specifies the technical conditions of five types of needle roller combination bearings (hereinafter referred to as combination bearings): 1. Needle roller and full complement thrust ball combination bearings: 2. Needle roller and thrust ball combination bearings: 3. Needle roller and angular contact ball combination bearings; 4. Needle roller and three-point contact ball combination bearings. This standard applies to the production, inspection and user acceptance of the following needle roller combination bearings. 7 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in the vehicle standard. When this standard is published, the versions shown are valid. All standard readers will subscribe to it. All parties using this standard should explore the possibility of using the latest version of the following standards. GB/307.2 — 1955 | | tt | | GB.T 307.31996 | | tt | tt||January/2122:1991
3123—1991
JE/T3573—1993
JB/T3574—1997
JB/T 6641—1993
JB/T 7051—1993
JB/T 892[—1999
“Principles and methods of measuring and inspecting rolling bearings General technical rules for rolling bearings
Radial play of rolling bearings
Symbols for rolling bearing numbers
Packaging of rolling bearings
Dimensions of combined bearings of needle rollers and thrust cylindrical pins; Technical conditions for heat treatment of flat parts of rolling bearings made of carbon steel; Dimensions of combined bearings of needle rollers and thrust balls; Dimensions of combined bearings of needle rollers and angular contact balls; Measurement and evaluation methods of radial play of rolling bearings; Product marking of rolling bearings
Residual magnetism of rolling bearings and its evaluation method
Method for measuring and evaluating the surface roughness of rolling bearing parts; Inspection rules for rolling bearings and their commodity parts China Machinery Industry Federation 2001-05-23 Approved 2001-10-01 Implementation
3 Symbols and definitions [See Figure 1-14]
JB.T77—2001
This standard adopts the following symbols and definitions: Other symbols in this standard are the same as those in B/116643, GB/T7811, JB/T3122 and JB/T3123.
3.2 Nominal inner diameter of the needle group, F: The diameter of the theoretical cylinder connected to all the needles. 3.3 Actual inner diameter of the needle group, F: The diameter of the cylinder connected to the needle group. It means that the inner diameter deviation of the needle group is the same as the inner diameter of the needle group when the radial direction is drawn. 3.3 The actual inner diameter deviation of the needle group, 2F: The integral of the actual inner diameter of the needle group and the nominal inner diameter. AF=FF
3.4 ​​The average inner diameter deviation of the auxiliary single plane, 4m3.5 The average outer diameter deviation of the seat single plane, 4m3.6 The total width deviation of the double half inner single of the ball combination bearing. Japanese figure roller and full-fill thrust ball combination bearing
(for pool lubrication)
NX 00 type
Figure 2 Needle roller and full complement thrust ball bearing combination
(for grease lubrication)
NX 00Z type
JB8877-2001
3 Needle roller and full complement thrust ball bearing combination with inner ring (for oil lubrication)
Figure 5 Roller and thrust ball bearing combination
NKX
Figure 4 Needle roller and full complement thrust ball bearing combination with inner ring (for grease lubrication)
NX 0oZ+IR Figure 6 Needle roller and thrust ball combination bearing with outer cover NKX00Z type
8877-001
Needle roller and thrust ball combination bearing with internal leakage NKX00+IR below the figure
Figure 9 Waste needle and thrust round hanging roller combination bearing NKXR type
Figure 8 Painted needle with inner partition and thrust ball with outer cover NKX 00Z+IR to
Figure 10 Needle roller and thrust roller with outer cover Red He Chi bearing: NKXR00Z type
188877—2001
Because of the inner roller and the force-catching roller combined auxiliary bearing NKXR00+1H type
Figure 13 Needle and angular contact bearing
NKIA0600 type
Method 2 Needle and thrust roller combination bearing with inner circle
NKXRZ+IR type
Circle 14 Needle and one-point contact bearing NKIB0000
4 Technical requirements
4.1 Materials and hardness
8 88772001
The bearing and rolling elements of the combined bearings shall be made of GCr15 bearing steel. The strength and heat treatment quality shall comply with the requirements of JB/T1255: 4.2 Tolerances
4.2.1 The tolerances of needle roller full-fill thrust ball combined bearings, needle roller and square ball combined bearings, and needle roller and thrust roller combined bearings shall be as specified in Table 4 of this specification.
Table internal diagram
Shanghai difference
E: Xie difference
Lower deviation
Lower situation difference
Small deviation
Table 2 Outer ring
T Front gasket
Table shaft ring
Upper adjustment difference
Upper deviation·lower compensation difference
Upper deviation
Lower Xie difference
Lower Xie difference
188877-200
Table 4 The tolerances of the nominal inner diameter of the needle roller assembly and the front and rear ball and three-point contact ball threaded bearings shall be in accordance with the provisions of Tables 5 and 6. Table: Inner circle
Lower contact difference
Lower dive difference
4.3 Surface roughness of the matching surface and end face
NK1AO (N type
[: Deviation
Qiu6 Outer ring
Lower deviation
NKIA SHU
Upper deviation: Lower deviation
and
lower deviation
NKIR000 type
lower deviation
lower difference
The relative tolerance between the mating surface and the surface of the combined bearing shall comply with the provisions of 0B/T307.3 for Class 0 tolerance bearings 4.4 The radial clearance of the needle rollers of the combined bearings shall comply with the provisions of Group 0 in GBT4604. 4.5 Residual magnetism The residual magnetism of combined bearings shall be in accordance with the provisions of JB/T6641. 4.6 Replacement The same as the bearings in the same drawing, the same as J8T88772001 4. 6.1 Roller and full-filled thrust ball, needle roller and thrust ball, needle and cylindrical roller combined bearings, their separable shaft rings, cage assemblies with a complete set of thrust balls (round hanging rollers), outer parts and inner rings shall be interchangeable. 4.6.2 The inner rings of needle and intermediate contact ball bearings and the outer rings with cages and a complete set of rolling elements shall be interchangeable. 4.7 Others 4. 1 The outer cover and shaft ring of needle roller and full-filled square ball, needle roller and thrust ball, needle and thrust cylindrical roller combined bearings shall be guaranteed to be free of rust.
4.7.2 If the user has special requirements for tolerances, travels, etc., they can negotiate with the manufacturer to determine. 5 Inspection method
5. 1 Tolerance measurement
5. 1. 1T, the back
Use a block gauge or a standard part for comparison measurement. Support the flange bottom surface of the outer component on three fixed fulcrums that are evenly distributed and at the same height. The indicator is directly above the fixed point on the shaft bottom surface. Measure the required distance between the shaft and the convex bottom surfaces of the outer component at several positions on the circumference (see 15)
&T-TT
5. 1. 2, the test product
Use a block gauge or a standard part for comparison measurement. The outer datum should be supported on two evenly distributed and equal-height fixed fulcrums. The indicator should be placed just above a fixed fulcrum on the bottom of the chain ring. Measure the width C between the bottom of the secondary shaft ring and the outer end face at two positions (see Figure 16). ACEC, C
Measurement of 5.1.3
JB/8877—3001
Note: The large and small sizes of Honglun bearings can be replaced by inspection parts precision. 5.1.3.2 Needle roller and angular contact spring bearing (see Figure 18): Install the bearing ring assembly and inner ring on a standard conical spindle, support the spindle between two precision points, place the indicator in the middle of the outer surface of the outer ring, keep the outer ring fixed, rotate the spindle for more than one circle, and the difference between the maximum and minimum values ​​is the inner ring radial runout K, Figure 18
5.1.3.2 Needle roller and angular contact spring bearing (see Figure 18): Install the bearing horizontally on a standard conical spindle, support the spindle between two precision points, place the indicator in the middle of the outer surface of the needle roller bearing part, keep the outer ring fixed, rotate the spindle for more than one circle, and the difference between the maximum and minimum values ​​is the inner ring radial runout K. Figure 8
.1.3. Ball bearing part of the combined shaft of needle roller and angular contact ball (see Figure 19: The bearing is horizontally installed on the standard taper mandrel, and a stable central axial measuring load is measured on the outer reference end face (the load value is in accordance with the provisions of GB/T307.2-1995 Appendix A for ball bearings). Then the mandrel is supported between the two precision parts, and the indicator is in the middle of the outer surface of the ball bearing part. Keep the outer part fixed. JB/8877-200
Rotate the mandrel for more than one circle. The difference between the maximum and minimum values ​​measured is the radial vibration of the inner part. 19
5. 1. 4 Measurement of K, Note: K of combined bearings may also be replaced by the reference part number. 5.1.4.1 Needle roller and full complement thrust ball, needle roller and thrust thrust, needle roller and thrust return cylindrical roller combination (see Figure 72): Install the outer ring assembly and inner ring of the bearing horizontally on a standard thrust taper mandrel, and place the center mark between two precision points. Place the indicator in the middle of the outer surface of the outer ring, keep the inner ring fixed, and rotate the outer ring for more than 1-2 weeks. The difference between the maximum and minimum values ​​measured is the outer radial runout. 5.1.4.2 Needle roller and angular contact ball combination bearing [see Figure 18]: Install the auxiliary bearing horizontally on a standard difficult mandrel, and place the mandrel support between two precision points. The indicator is placed on the middle of the outer surface of the needle roller bearing, keeping the inner resistance fixed, rotating the outer ring for more than one circle, and the maximum and minimum measured difference is the outer ring radial runout. 5.1.4.3 Ball bearing part of the needle roller and angular contact ball combination shaft (see Figure 19): Install the bearing horizontally on the standard taper mandrel!, and apply a stable axial load to the axial end face of the outer ring (the load value is in accordance with the provisions of GB/T307.2-1995 Appendix A for ball bearings, and then support the mandrel between the two tips, and the indicator is placed on the middle of the outer surface of the ball bearing part, keeping the inner resistance fixed, rotating the outer ring for more than one circle, and the maximum and minimum measured difference is the outer circle radial runout. 5.1. 5.1.6 Other tolerance items
The tolerance items are in accordance with the provisions of GD/T307.2. 5.2 Surface roughness measurement2 The needle drop part of the needle roller and angular contact ball combination bearing [see Figure 18: Install the auxiliary bearing horizontally on the standard tapered spindle, and support the spindle between the two precision items. The indicator is applied to the middle of the outer surface of the needle roller bearing part, keeping the internal resistance from rotating, and rotating the outer ring together. The measured maximum and minimum difference is the radial runout of the outer ring 5.1.4.3 The ball bearing part of the needle roller and angular contact ball combination bearing (see Figure 19): Install the bearing horizontally on the standard taper spindle! , and apply a stable axial running load on the end face of the outer ring (the load value is in accordance with the provisions of GB/T307.2-1995 Appendix A for ball bearings. After that, support the mandrel between the two precision tips, and place the indicator at the middle of the outer surface of the ball bearing part. Keep the inner ring fixed and rotate the outer ring for more than one circle. The difference between the maximum and minimum measured values ​​is the radial runout of the outer circle. 5.1. 5F inspection
F is inspected with a tapered mandrel calibrated with a "pass end" and "stop end". The nominal diameter of the "pass end" plug gauge is 2mm smaller than the inner diameter of the needle roller set. The true diameter of the "stop end" plug gauge is 2mm larger than the maximum inner diameter of the needle roller set. 5.1.6 Other tolerance items
The common tolerance items are in accordance with the provisions of GB/T307.2. 5.2 Measurement of surface roughness2 The needle drop part of the needle roller and angular contact ball combination bearing [see Figure 18: Install the auxiliary bearing horizontally on the standard tapered spindle, and support the spindle between the two precision items. The indicator is subjected to the middle of the outer surface of the needle roller bearing part, keeping the internal resistance from rotating, and rotating the outer ring together. The measured maximum and minimum difference is the radial runout of the outer ring 5.1.4.3 The ball bearing part of the needle roller and angular contact ball combination bearing (see Figure 19): Install the bearing horizontally on the standard taper spindle! , and apply a stable axial load to the end face of the outer ring (the load value is in accordance with the provisions of GB/T307.2-1995 Appendix A for ball bearings. After that, support the mandrel between the two tips, and place the indicator at the middle of the outer surface of the ball bearing. Keep the inner ring fixed and rotate the outer ring for more than one circle. The difference between the maximum and minimum measured values ​​is the radial runout of the outer circle. 5.1. 5F inspection
F is inspected with a tapered mandrel calibrated with a "pass end" and a "stop end". The nominal diameter of the "pass end" plug gauge is 2mm smaller than the inner diameter of the needle roller set. The true diameter of the "stop end" plug gauge is 2mm larger than the maximum inner diameter of the needle roller set. 5.1.6 Other tolerance items
The common tolerance items are in accordance with the provisions of GB/T307.2. 5.2 Measurement of surface roughness
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