This standard specifies the technical requirements, test methods, inspection rules, etc. for roller and sprocket bearings for forklift masts. JB/T 7360-1994 Rolling bearings Technical requirements for roller and sprocket bearings for forklift masts JB/T7360-1994 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Rolling Bearings
Technical Conditions for Roller and Sprocket Bearings for Forklift Masts Subject Content and Scope of Application
JB/T 7360--94
This standard specifies the technical requirements, test methods, inspection rules, etc. for roller and sprocket bearings for forklift masts. This standard applies to roller and sprocket bearings for 0.5-10t forklift masts. It is used for production, inspection by manufacturers and acceptance by users. Reference standards
GB274 Rolling bearing assembly chamfer limit
GB307.1 Rolling bearing tolerance
Method for measuring rolling bearing tolerance
--General technical requirements
Rolling bearing
GB 309
G13203
Rolling bearing steel ball
Rolling bearing needle
Technical conditions for carburized bearing steel
GB 4199
GB 4661
Definition of rolling bearing tolerances
Rolling bearing cylindrical roller
GB/T4662Rated static load of rolling bearings
GB6391
GB7324
JB1255
Calculation method of rated dynamic load and rated life of rolling bearingsUniversal lithium-based grease
Technical conditions for heat treatment of rolling bearing parts made of high carbon chromium bearing steelJB/T3573
JB/T6641
ZBJ11 020
Method for measuring radial clearance of rolling bearings
Residual magnetism of rolling bearings and its evaluation method
Inspection rules for rolling bearings and their commodity parts Technical conditions for YB9 chromium bearing steel
3 Terms and symbols
3.1 Terms
The tolerance definitions quoted in this standard comply with the provisions of GB4199. 3.2 Symbols (see schematic diagrams 1 to 6)
d: nominal inner diameter
D: nominal outer diameter
LD): nominal diameter of sprocket bearing groove
Dh: diameter of tapered roller bearing at the distance from the large end holeB: nominal width of inner ring
: offset of inner ring relative to outer ring
C: nominal width of outer ring
Approved by the Ministry of Machinery Industry on July 26, 1994
Implementation on July 1, 1995: (: Nominal width of sprocket bearing groove: R: Nominal arc radius of arc surface roller bearing: Nominal semi-cone angle of tapered roller bearing: Nominal arc radius of outer cabinet large chamfer: Nominal arc radius of outer chamfer: Nominal chamfer dimension of inner ring: Figure 1: Circular arc surface roller bearing: 3: Tapered roller bearing: IB/T 7360: Cylindrical roller bearing: Figure 4: Sprocket ball bearing: Figure 5: Sprocket roller bearing: 4: Technical requirements for roller and sprocket bearings: 4.1 Tolerance: JB/T 7360
Figure 6 Side roller bearing
4-1.1 The inner tolerance of roller and sprocket bearings shall comply with the provisions of GB307.1 Newton 0 tolerance. 4.1.2 The outer ring tolerances of roller and sprocket bearings are shown in Table 1 and Table 2. 4.1.3 The chamfer of the inner ring of roller and sprocket bearings shall comply with the provisions of GB274. The radius r of the arc of the large chamfer of the outer ring of roller bearings is shown in Table 3. Table 1
The outer ring tolerances of roller and sprocket bearings
Upper deviation
-1-200
—250
Lower deviation
---200
Upper deviation
-+-250
Lower deviation
Arc semicircular Diameter rt
Upper deviation
JB/T7360----94
Continued Table 1
Lower deviation
Tolerance of outer ring of tapered roller bearing
Working deviation
Lower deviation
Table 3 Tolerance limit deviation of arc radius r1 of large chamfer of outer ring of roller bearing
4.1.4 Semi-cone angle and tolerance of outer surface of tapered roller bearing The nominal semi-cone angle is 2°51°44.5\ (taper 1:10). Tolerance is ±18\4.2Material
Arc radius r
Upper deviation
Upper deviation
Lower deviation
Lower deviation
-- 150
Limit Deviation
When roller and sprocket bearings are made of GCr15 and GCr15SiMn, the steel material shall comply with the provisions of YB9. For special requirements, the outer ring can be made of carburized bearing steel G20CrMo, and the steel material shall comply with the provisions of GB3203. 4.3 Heat Treatment Hardness
4.3.1 The hardness of the inner ring and rolling element of roller and sprocket bearings shall comply with the provisions of GB307.3. 4.3.2 The hardness of the outer ring is HRC55~60. For the double hardness type, the outer ring outer diameter surface hardness is HRC30~42, the raceway hardness is HRC58~62, and the raceway hardening layer of the GCr15 steel outer ring is about 3mm. 4.4 Surface Roughness of the Matching Surface
The surface roughness of the inner ring inner hole surface and the end face of the roller and sprocket bearings shall comply with the specifications of the 0-grade tolerance bearing in GB307.3. The surface roughness of the outer ring is Ra1.6μm, and the end face is Ra3.2μm. 4.5 Rolling elements
4.5.1 The tolerance grade of the steel ball shall not be lower than the G28 grade specified in GB308. 606
JB/T 7360-94
4.5.2 The tolerance grade of the cylindrical roller shall not be lower than the grade II specified in GB4661. 4.5.3 The tolerance grade of the needle roller shall not be lower than the G3 grade specified in GB309. 4.6 Clearance
4.6.1 The radial clearance of roller and sprocket bearings is shown in Tables 4 and 5. Table 4 Radial clearance of ball bearings
Nominal inner diameter
Nominal inner diameter
Table 5 Radial clearance of roller and needle roller bearings Clearance
If the user has special requirements for axial clearance, please refer to the provisions of Table A1 in Appendix A. 4.6.2
4.7 The grease for roller and sprocket bearings shall comply with the provisions of GB7324. The amount of grease injected shall be more than 70% of the effective space inside, and the grease must be injected into the raceway.
4.8 Other requirements
4.8.1 The surface of roller and sprocket bearing parts shall not have cracks, sharp angles, burrs and obvious bumps. 4.8.2 Both ends of the bearing must be sealed and dustproof with sealing rings or dust covers. The sealing ring or dust cover shall not extend beyond the end face of the inner ring, and shall not be loose or fall off. The dust cover shall not be in contact with the retainer and inner ring at any position. 4.8.3 The roller and sprocket bearings shall rotate flexibly without blocking. 4.8.4 The residual magnetism of roller and sprocket bearings shall comply with the provisions of JB/T6641. 4.8.5 The roller and sprocket bearings shall comply with this technical condition. If the user has special requirements, they shall be stated in the drawings. 5 Reliability and load requirements of roller and sprocket bearings 5.1 The calculation of the basic rated static load and basic rated dynamic load of roller and sprocket bearings shall be in accordance with the provisions of GB/T4662 and GB6391. 5.2 The crushing load of roller bearings shall not be less than 5 times the basic rated static load. 5.3 The reliability assessment of roller and sprocket bearings shall be determined by negotiation between the supply and demand parties. 607
6 Measurement methods and inspection rules
JB/T 7360 --- 94
6.1 The measurement of dimensional tolerance and rotation accuracy shall be carried out in accordance with the provisions of GB307.2. 6.2 The measurement of the flat cone angle α, dimensional deviation △Dhm and V1m value of the can roller bearing. 6.2.1 The measurement of the cone half angle α shall be measured with a square angle ruler. 6.2.2 Determination of AhVD value
Select the measuring fulcrum, whose coordinates must be greater than the maximum chamfer coordinates (as shown in Figure 7), lower the measured piece to the instrument frame!, rotate and fix, and send the maximum and minimum values ​​on the instrument at the fulcrum. Thus, the difference between the maximum and minimum values ​​of △1)m+ is VD Figure 7
6.3 The inspection method of metallographic structure and hardness value shall comply with the provisions of JB1255. 6.4 The surface roughness shall be measured by comparison block or measuring instrument. 6.5 The measurement method of roller radial clearance shall be in accordance with the provisions of JB/T3573. When the outer ring is a conical surface, a conical external sign shall be used for measurement. 6.6 The roller bearing crushing test method shall be in accordance with the provisions of the competent department of the manufacturer. 6.7 The inspection rules shall be in accordance with the provisions of ZBJ11020. The AQI. value of the main inspection items is 1.5. The AQI. value of the secondary inspection items is 4. The inspection items are shown in Table 6.
Main inspection items
Inner diameter size (AdupVpVamp)
Outer diameter size (me, VpVpmpArhmp.Vi) Radial clearance ()bzxZ.net
Rotation accuracy (Kin, Krn)
Nominal arc radius of large chamfer (r)
Inspection item circumference
Secondary inspection item
Width (Am, Vw.cV)
Surface roughness
Standard and weak rust packaging
Inspection of hardness
JB/T 7360-94
The number of hardness sampling sets is less than 5 sets, and the number of qualified judgments is 0. Marking, rust prevention and packaging
The marking content and method, rust prevention and inner and outer packaging of roller and sprocket bearings shall comply with the provisions of (B307.3 6039
JB/T7360--94
Appendix A
Axial clearance of roller and sprocket bearings
(reference)
A1 The axial clearance of roller and sprocket bearings is shown in Table A1. Table Al
Axial clearance of roller and sprocket bearings
Nominal inner diameter d, mm
Additional notes:
Deep groove ball bearings
This standard is proposed by the National Technical Committee for Standardization of Rolling Bearings. This standard is under the jurisdiction of Luoyang Bearing Research Institute of the Ministry of Machinery Industry. Roller and needle roller bearings
This standard was jointly drafted by Beijing Hoisting Machinery Research Institute of the Ministry of Machinery Industry, Luoyang Bearing Research Institute, Beijing People's Bearing) and Rugao Bearing Factory.
The main drafters of this standard are Li Feimei, Sun Weihong, Cui Zhihui and Zhang Xike.
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