JB/T 8875—2001 JB/T 8875-2001 Technical conditions for seated outer spherical ball bearings JB/T8875-2001 Standard download decompression password: www.bzxz.net

1CS 21. 100. 20
Mechanical Industry Standard of the People's Republic of China
J13/T8875-2001
External Spherical Ball Bearings with HousingswwW.bzxz.Net
Technical Conditions
Insert bearingunits-Specifications2001-05-23 Issued
China Machinery Industry Federation
2001-10-01 Implementation
JB/8875-2001
This standard is a revision of JB/T8875-1999 Technical Specifications for Spherical Ball Bearings with Housings (originally numbered ZBJ11007-197).
Compared with JB/T8875-1999, the main changes in this standard are the expansion of the applicable range, the addition of Chapter 3 symbols: the requirements for the dimensional tolerances of the auxiliary bearings of the vertical housing with punching method have been added; the requirements for the magnetic and radioactivity of the housing bearings have been added. and measurement methods; added markings and other contents.
and this standard replaces JR8875-1999 from the date of implementation. This standard was proposed and drafted by the National Technical Committee for Standardization of Rolling Bearings. This standard was drafted by Luoyang Bearing Research Institute. The main authors of this standard are Ma Suo and Song Feizhang. This standard was first issued in 1987 as ZBJ1:0071987, and the standard number was adjusted to JB/T8875-1999 in April 1999. This is the second revision.
1 Scope
Machinery Industry Standard of the People's Republic of China
Technical Conditions for Spherical Ball Bearings with Housings
[ngertbearing unlts-Speclficatiops JB/TB87S—2001
Generation IB/T 75—1994
This standard specifies the technical requirements, measurement methods, inspection rules, packaging and marking of outer spherical ball bearings with seats (hereinafter referred to as seat bearings).
This standard is applicable to the production, inspection and user acceptance of seat bearings with dimensions in accordance with JB/TB0 and T33. 3 Reference standards
The provisions contained in the following standards constitute the provisions of this standard by being referenced in the standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and the parties using this standard should discuss the possibility of using the latest versions of the following standards. GB/T37.2—1995
G 7324--1994
GR/T7810—1905
GB/T 8597--1988
18/T 3574--1997
JB/T 5303—1991
JB/T6363—1992
JB/T 664!—1993
JB/T 8876—2000
JB/T 891y-1999
JB/T8921—1999
3 Special
Principles and methods of rolling bearing pairs and inspections Universal base grease
Rolling bearings pedestal external helical ball bearings dimensions Dynamic bearing packaging
Rolling bearings product logo
Pedestal external end bearings supplementary structure dimensions Technical conditions for stamping seats of external spherical ball bearings
Dynamic bearing foundation and its evaluation force method
Rolling bearings pedestal external spherical ball bearings repair seats Technical conditions for rolling bearings, ball bearings and eccentric sleeves, technical conditions for rolling bearings and their products, inspection and repair rules, and symbols quoted in standards, their definitions are specified in G8/T7810, JB/T5303, JB/T8876, JB/8919 and IB/T6363.
4 Technical requirements
4.1 The technical requirements for bearings and bearings for assembly with seats shall comply with the provisions of JB/T8919 and JB/TB76, respectively, and the bearing seat shall comply with the provisions of T6363.
4.1. The inner diameter difference of the seat shall comply with the provisions of B/T8919: 4.1.2 The limit deviation of the spherical center quotient of the seat bearing shall comply with the provisions of JBBB76 and JB T6363. 4.1.3 The limit deviation of the outer diameter D of the boss-shaped seat bearing shall comply with the provisions of Table 2 in 8876-2000. Approved by China Machinery Industry Federation on 26-05-23, implemented on 2001-10-01
JB8875-2001
4.1.4 The limit deviations of the outer diameter D1 and width 4 of bearings with annular seats shall comply with the provisions of Table 4 of JB/TBB76-2000: 4.1.5 The limit deviations of the bracket width 4 and the base distance H1 of bearings with regular block seats, the symmetry between the side faces and the symmetry of the two sides with respect to the axis, shall comply with the provisions of Table 3 modified 4.24 of B76-2004. 4.1. The tolerance of the hole position of the bearing with a stamped seat and the bearing with a mesh seat shall comply with the provisions of Table 2 of [R8876-2000.
4.1.7 The limit tolerance of the side length N of the hole of the bearing with a stamped seat and the measurement of the line position of the screw hole shall comply with the provisions of 4.2.2 and 4.2.3 of JR Ting 36.1-1992
4.1.B The relative bottom surface of the seat of various structural types of bearings with seats shall comply with the provisions of 4.2.6 in /T8876-2000. 4.2 The linear magnetic value of the bearing with a seat shall comply with the provisions of JBT6641. 4.3 The flexibility and sealing of the bearing with a seat shall comply with the provisions of the manufacturer. 4.4 The oil quality of cast bearing seats and the surface treatment quality of stamped bearings shall comply with the provisions of JB/TSS76 and AD/T6363 respectively.
4.5 The groove between the bearing seat and the shaft of the bearing seat shall be oil-free, and its location shall ensure that the lubrication path is unobstructed after the grease nozzle is installed. 4.6 The shaft seat and the shaft of the bearing seat shall be self-aligning, and the degree of self-alignment shall comply with the manufacturer's specifications. 4. The bearing seat is not filled with 2\ industrial lithium-based grease in accordance with the provisions of GB7324. When the user uses the 3D medium-sized grease, the 2T industrial lithium-based grease shall still be used.
4.8 The rated load and maximum speed of the bearing seat shall not be lower than the manufacturer's! 4.9 Appearance quality of seated bearings
4.9. The auxiliary bearings of seated bearings are allowed to have cracks and obvious scratches, scratches and other defects, and there shall be no visible rust and wear spots. 4.9.2 The appearance quality of the slag bearing seat of the seated auxiliary bearing shall comply with the provisions of JB/T8876. 4.9.3 The appearance quality of the bearing seat of the seated bearing shall comply with the provisions of JB/T6363. 5. Measurement method
5.1 The inspection method of the inner diameter of the seated bearing shall comply with the provisions of JB/T307.2. 5.2 The inspection method of the spherical center height H of the vertical seated bearing and the spherical center height A of the square, vine-shaped, must-hold, boss round housing bearings, and the symmetry of the two sides of the sliding seated bearing shall comply with the provisions of JB/T8876 and JB/T6363. 5.3 And the dimensional tolerance shall be checked with a device or a disc. 5.4 The measurement of the magnetic field of the bearing shaft shall be in accordance with the provisions of JBrT664T. 5. The appearance quality of the seat bearing shall be visually inspected.
61 The bearings and bearings for ton bearings shall be marked with the bearing or bearing seat model, manufacturer code (or trademark) respectively. The position and size of the mark shall comply with the provisions of the product drawing.
6.2 The marking method of the bearing and stamping bearing seat of the seat bearing shall be in accordance with the provisions of JB/T3574. The casting micro bearing seat shall directly cast the model, manufacturer code (or trademark).
6.3 The left seat bearing certificate and packaging container shall be marked with the complete code of the seat bearing, manufacturer name (or trademark) and year and month of production (or its code).
1 Inspection and testing
JRT75200
Subscribers can select the inspection and acceptance of finished products according to the inspection requirements specified in the table. The inspection shall be carried out according to the method specified in "JRT892". The acceptable quality level AQL of the main item is 4, and the AQL of the secondary item is 6.5. If the subscriber has other requirements, it shall be determined by negotiation between the subscriber and the manufacturer. Table 1 Inspection items for finished product polishing of bearings with seats
Main inspection items
Inner diameter deviation of bearings with seats
The spherical center height of the bearings with square, hanging, and mesh seats and the limit deviation of the spherical center height of the bearings with bosses and the outer diameter L1 of the bearings with ring seats and the limit deviation of the outer diameter of the bearings with sliding blocks and the outer width of the bearings with sliding blocks.The limit blue and position tolerance of square, round and boss bearings. The limit tolerance of the center of the spherical center of the bearing. The limit tolerance of the hole of the stamped bearing. The position tolerance of the stamped shape, three-dimensional shape and ring-shaped bearing. The shape and position tolerance of the surface of the bearing. Anti-rust and packaging. Inspection items. The contact activity, sealing and magnetic strength of the bearing. The appearance quality of the bearing. 1. The bearing and the bearing seat should be assembled into a bearing seat after anti-rust treatment in stages, and then wrapped according to the provisions of GD/T8597. If the subscriber has special requirements, the packaging method can be negotiated with the manufacturer. 82 Under normal storage and transportation conditions, the bearing seat should be guaranteed not to rust within one year. The anti-rust period is calculated from the date of leaving the factory.
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