JB/T 8919-1999 JB/T 8919-1999 Technical conditions for rolling bearings, spherical ball bearings and eccentric sleeves JB/T8919-1999 Standard download decompression password: www.bzxz.net

ICS21.100.20
Machinery Industry Standard of the People's Republic of China
JBT 8919—1999
Rolling bearings
Insert bearings and eccentric sleeves
Technical conditions
-Insert bearings and eccentrie locking collars-Specifications1999-06-28Promulgated
National Machinery Industry Bureau
2000-01-01Implementation
JB/T8919-1999wwW.bzxz.Net
This standard defines the requirements of ZBJ1I008—B Technical requirements of insert bearings and eccentric sleeves. This standard mainly modifies the dimensional tolerance, running accuracy, and diameter and runout values ​​of external spherical ball bearings and eccentric sleeves according to IS 9628-1992 Rolling bearings, external spherical ball bearings and eccentric sleeves, and JIS B1558-1995 Rolling bearings, external spherical ball bearings. At the same time, the material and bonding treatment of bearings and eccentric sleeves, and the eccentric disc test method are added. This standard replaces ZBJ11008-B7 from the month of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Rolling Bearings. The drafting unit of this standard is Luoyang Bearing Research Institute. The main drafter of this standard is Ma Suqing.
This standard was first issued in 1975 as 1B1650. It was revised for the first time in 1987. This is the second revision. The Mechanical Industry Standard of the People's Republic of China
Rolling Bearings
Technical Conditions for Outer Spherical Ball Bearings and Eccentric SleevesRollingbearinga
-lnscrd heartmgsand ercentrke locking collarsSpecificailons"Scope
JB/T8919-1999
Generation ZHJG8-8T
This standard defines the technical requirements, test methods, inspection rules, packaging, and other requirements for outer spherical ball bearings (hereinafter referred to as bearings) and eccentric sleeves. It is applicable to the outer dimensions of the bearings and eccentric sleeves that do not conform to the standard (hereinafter referred to as 3882) for manufacturing, production, inspection and acceptance. 2 Referenced Standards
The texts contained in the following standards have become the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid and all standards will be in force. All parties using this standard should explore the possibility of using the following newer versions. GD/T 307.2-1995
CE/T699-1988
GD/T 36821995
GB.T 4199—1984
GB:T 6930—1986
GB:T:7324—1987
GH78597—1984|| tt | 9-1968
3 Definition
Principles and methods of rolling bearing measurement and inspection, high-quality carbon structural steel, technical conditions
Rolling bearings, spherical ball bearings and eccentric sleeves, dimensions and tolerances of rolling bearings
Rolling standard
Universal lithium-based grease
Thin rolling bearing packaging
High magnetic chromium bearing steel, rolling bearing parts, heat treatment technology, rolling bearing product marking
Spherical bearing diameter and displacement
Rolling limit and its evaluation method
Rolling Hardness test method for moving shaft parts
Inspection rules for moving bearings and their commodity parts Chromium-assisted bearing steel technical parts
This standard uses the definitions of concave in GB/T6930 and GBT4199. 4 Symbols and abbreviations
Symbols and abbreviations are shown in Figures 1 to 4.
Except for the following symbols, the definitions of the symbols quoted in this standard are specified in GB/T882. H: Eccentric surface of the inner or eccentric sleeve, single size, eccentricity, Guodong Machinery Industry Fan Approved on June 2, 1999, and implemented on January 1, 2000| |tt||4m: Single: average inner diameter deviation in the surface
4: Eccentric width single inner diameter deviation
JBT8919—1999
2d: Eccentric sleeve eccentric surface single inner diameter deviation 2: Rail bearing average external light deviation (outer spherical surface average diameter deviation) A: Internal single width deviation
B: Eccentric sleeve single width deviation
2AI: Eccentric sleeve eccentric surface single width deviation: Deviation of inner circumference or eccentric sleeve single eccentric disk%: Inner single light plane inner diameter variation of bearing: Complete bearing inside Precision radial runout
K.: The radial runout of the outer periphery of the bearing is expressed as the difference between the actual average diameters of the two required return holes. The chain tolerance uC type
Figure 1 Bearing with thread auxiliary
Figure 4 Bearing with top thread
LEL type
Figure 2 Bearing with center sleeve
Figure 3 Bearing with axial hole
5 Eccentric bearing
S Technical requirements
JB/T8919-1999
Figure 6 Inner eccentric part of eccentric sleeve bearing 5.! Materials and heat treatment
5.1.1 Bearing rings and balls are made of Cr15 and Cr15SiMn bearing steel. The material should comply with the requirements of YB9. The hardness of raceway and steel ball is 59-65HRC and 62~66HRC respectively. The heat treatment should comply with the requirements of JB/T1255: 5.1.1 Eccentric sleeve is made of high-quality magnetic structural steel in accordance with the requirements of GD/T699. S.1 Tolerance
5.2.1 The size tolerance and rotation tolerance of the bearing also comply with the requirements of Table 1, Table 2 and Table 3. Table 1 Inner ink
>[0~18
>[B-30
>30-50
>80--120
120~180
Upper offset pad
3 offset pad
Lower deviation
Note: When required by the user, the inner hole surface can be keyed, and the tolerances listed in the table are also applicable to the inner hole surface after keying. Table 2 Inner ring taper hole
>10-18
>18-30
>50-80
Upper deviation
Lower deviation
. Deviation
Lower deviation
Center~50
> 811- 120
>126-1SU
18625n
>250-315
Above: Inquiry difference
JB/r$919-1999
Table 3 External source
Note: The lower caution difference is applicable within the width of the outer peripheral instant. 5. 2. 3
The size of the eccentric sleeve shall comply with the requirements of requirement 4. Table 4 Eccentricity variation
Upper deviation
→19·35
-35- 55
5.3 Roughness of the surface
Lower deviation
Upper deviation
Lower error
Upper error
F code
Lower deviation
The surface roughness and the values ​​of the bearing and the eccentric sleeve at the beginning and the end shall be in accordance with the provisions of Table 5. Table 5 Surface roughness R of the bearing and the eccentric sleeve
Yuan surface roughness
Surface roughness R position
5.4 Radial free play
The radial free play value of the bearing shall be in accordance with the provisions of JB/T5304. 5.5 The micro value of the shaft shall comply with the provisions of JB6641, and 5.6 The marking of the shaft shall comply with the provisions of JD3574.
5.7 Others
Drawing surface
Center change matching surface
Upper-old
Lower-poor
Precision inspection time
5.7.1 The technical requirements for bearing lubrication shall comply with the provisions of GBT7324, and the other quality components shall comply with the current regulations of the manufacturer. If there are special requirements, the subscriber shall negotiate with the manufacturer to confirm. 5.7.2 During the operation of the shaft dynamic assembly, except for the sealing lip and the outer diameter of the inner ring, which are allowed to rub against each other, the other parts shall not be loose.
5.7.3 The sealing performance of the shaft components shall comply with the regulations of the manufacturer's semi-pipe department. 4
JRT A919-1990
5.7.4 The eccentric sleeve is subjected to surface anti-rust treatment such as oxidation or zinc passivation. 6 Measurement method
6.1 Measurement of tolerance
6.1.2 Measurement of outer spherical diameter
When the outer spherical diameter is shown, multiple measurements are made on several spherical areas passing through the center of the sphere with a width of A away from the outer end face. 6.1.3 Measurement of eccentricity error H (see Figure 8) Apply two fulcrums on the inner diameter surface, move the lower sub-meter on the surface of the inner diameter of the pipe (Figure 8, measurement of inner ring centering error), rotate the inner ring for more than one circle, and the difference between the maximum value and the minimum value is 12 as the inner eccentricity value. Calculate the inner eccentricity deviation 41A to -HH by formula (1). Similarly, the eccentricity deviation H value of the eccentric sleeve can be measured. 6.2 The measurement of the diameter of the gland shall be in accordance with the provisions of JB/T5304. 6.3 The measurement of hardness shall be in accordance with the provisions of JB/T7361. 6.4 The measurement of the bearing shall be in accordance with the provisions of JB/T6641. Inspection requirements
The inspection of the bearing shall be in accordance with the provisions of IB/T8921. # Packaging
The packaging of the bearing shall be in accordance with the provisions of GB, T597
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