JB/T 7918-1997 This standard adopts the international standard ISO 3030:1996 "Rolling Bearing Radial Needle Roller and Cage Assemblies - Dimensions and Tolerances" in a non-equivalent manner. It is a revision of JB/T 7918-95. This standard specifies the dimensions, tolerances, functional inspection, inspection rules, rust prevention and packaging of radial needle roller and cage assemblies (hereinafter referred to as assemblies). This standard applies to the manufacture, inspection and acceptance of assemblies. JB/T 7918-1997 Rolling Bearing Radial Needle Roller and Cage Assemblies JB/T7918-1997 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7918—1997
neqIso3030:1996
Rolling bearings
Radial needle roller and cage assemblies
Published on October 5, 1997
Ministry of Machinery Industry of the People's Republic of China
Implementation on January 1, 1998
JB/T7918—1997
This standard adopts the international standard ISO3030:1996 "Rolling bearings radial needle roller and cage assemblies - Dimensions and tolerances" and is a revision of JB/T7918-95 Needle roller bearings radial needle roller and cage assemblies. The main differences between this revision and the previous version are as follows: a) According to the relevant provisions of GB/T272-93 and JB/T2974-93, the code of the radial needle roller and cage assembly has been modified.
b) The dimensions specified in Table 1 and Table 2 of this standard are completely consistent with ISO3030:1996, and the dimensions that do not belong to the ISO standard in the original Table 1 and Table 2 have been cancelled.
From the date of entry into force, this standard will replace JB/T7918-95. Appendix A of this standard is the appendix of the standard.
This standard is proposed and managed by the National Technical Committee for Standardization of Rolling Bearings. The drafting unit of this standard: Suzhou Bearing Factory. The main drafter of this standard: Gu Chaoyang.
Mechanical Industry Standard of the People's Republic of China
Rolling Bearings
Radial Needle Roller and Cage Assemblies
JB/T7918-1997
neqISO30301996
JB/T7918-95
This standard specifies the dimensions, tolerances, functional inspection, inspection rules, rust prevention and packaging of radial needle roller and cage assemblies (hereinafter referred to as assemblies).
This standard applies to the manufacture, inspection and acceptance of assemblies. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB309~84
GB1801—79
GB859788
ZB J11 02089
Symbols and abbreviations
Hydraulic bearings needle rollers
Tolerances and fits to 500mm holes, shaft tolerances and fits Rolling bearing packaging
Inspection rules for rolling bearings and their commodity parts Symbols and abbreviations are shown in Figures 1 to 4.
Unless otherwise specified, the symbols shown in the figures and the values ​​shown in the tables represent nominal dimensions. E: Needle roller set outer diameter
F.: Needle roller set inner diameter
B.: Cage width
Figure 1K type
Approved by the Ministry of Machinery Industry on October 5, 1997
Figure 2K-ZW type
Implemented on January 1, 1998
4 Overall dimensions
Figure 3K.D type
The overall overall dimensions are in accordance with the provisions of Table 1 and Table 2. JB/T 79181997
Figure 4K.ZWD type
Table 1 Diameter series 1C and 2C
Diameter series 1C
Diameter series 2C
Note: The sizes with subscripts in the table are preferred, diameter series 3C
Dimension series
13C23C33C43C53C63C
JB/T7918—1997
Table 1 (end)
Diameter series 3C, 4C and 5C
Diameter series 4C
Dimension series
Diameter series 5C
Dimension series
Diameter series 3C
Dimension series
13c23c|33c|43c53c63c
Note: The subscripts in the table are the preferred sizes, 5
Marking examples:
Example 1: Rolling bearing
Example 2: Rolling bearing
JB/T 7918-1997
Table 2 (end)
Diameter series 4C
Dimension series
JB/T7918-1997
K12X15X10
K60X66X352WD
JB/T7918-1997
The diameter and gauge value of the needle roller shall comply with the provisions of GB309. 6.1
The deviation of the cage width B. is 2&.mm. 6.2
Functional test
Diameter series 5C
Dimension series
Place the component between the outer raceway ring gauge and the inner raceway plug gauge, and it should rotate flexibly, smoothly, and without blocking. The nominal diameter of the outer raceway ring gauge hole is equal to E. The sum of the lower deviations from G6 in GB1801: The nominal diameter of the inner raceway plug gauge is equal to F, and the dimensions of the functional inspection gauge are shown in Table 3. Table 3
Dimensions of functional inspection gauges
Dimensions of inner raceway plug gauges
Equal to F
Dimensions of outer raceway ring gauges
E.+0. 005
5.+0. 006
8 Inspection rules
JB/T7918-1997
Table 3 (end)
Dimensions of inspection gauges
Dimensions of inner liquid channel plug gauges
Equal to F,
Dimensions of outer raceway ring gauges
E.+0. 010
8.1 The finished components shall be inspected by the quality inspection department of the manufacturer, and a quality certificate shall be attached after passing the inspection. 8.2 Inspection rules shall be in accordance with the provisions of Class C rolling bearing products in ZBJ11020. 9 Rust prevention and packaging
Cleaning of components Rust prevention and internal and external packaging shall be in accordance with the provisions of GB8597. On the packaging of the components, the upper and lower deviations of the average diameter of the needle roller grouping in the components shall be indicated.
Technical requirements for the fit between the shaft and the outer hole and the components 10
Technical requirements for the fit between the shaft and the housing hole and the components are shown in Appendix A (Appendix to the standard). A1 Dimensional tolerances
JB7T 7918--1997
Appendix A
(Appendix to the standard)
Technical requirements for the fit between the shaft and the housing hole and the components When the dimensional tolerance of the housing hole is G6, the dimensional tolerance of the shaft is recommended in Table A1. Table A1 Shaft Dimension Tolerancewww.bzxz.net
Shaft Nominal Size
Track Surface Hardness and Hardened Layer Depth
Track Surface Hardness 58~64HRC
Track Surface Hardness Depth
Track Surface Roughness
Track Surface Roughness R. Maximum value is 0.20μm. Track Surface Shape Tolerance
Track Surface Shape Tolerance See Table A2.
Less than 0 Group
Table A2 Track Surface Shape Tolerance
Nominal Size
Radial Clearance
Diagram
Greater than 0 Group
Housing Hole
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