Spherical Roller Bearings
SRB have two rows of spherical rollers, the outer ring has a common concave spherical raceway, the inner ring has two concave raceways that are inclined at an angle to the bearing axis, the curvature center of the outer ring raceway is the same as the bearing center. Spherical roller bearings are self-aligning and are not affected by misalignment of the shaft and bearing box or deflection of the shaft, and can compensate for the resulting concentricity errors. In addition to bearing radial load, this type of bearing can also bear two-way axial load and its combined load. It has a large bearing capacity and good vibration and impact resistance. Spherical roller bearings are mainly used in various mechanical equipment in steel, mining, papermaking, shipbuilding, textile machinery, coal mills, electric power and other industries. They are the most widely used type of bearings in the machinery industry.
Product category
The Spherical Roller Bearings currently produced by ZWZ can be roughly divided into the following structural types：
CA type
C type
CC type
Split D type
Vibrating Screen VB type
Continuous Casting CB type
SDB type
- CA type
- C type
- CC type
- Split D type
- Vibrating Screen VB type
- Continuous Casting CB type
- SDB type
Tolerance
The accuracy of ZWZ SRB has ordinary and 6 grades. For users with special requirements, products of Grade 5 can also be processed, and the tolerance is in line with GB/T 307.1.
Radial internal clearance
ZWZ SRB have 2, normal (N), 3, 4 and 5 groups of internal clearance, which are all in line with GB/T 4604.1. Tapered hole spherical roller bearings use 3 groups of clearances as the standard clearance. Bearings larger or smaller than the standard value of clearance can also be produced according to user requirements.
Vibrating machinery bearings need to use a larger radial clearance, 3, 4 groups or non-standard clearance between 3~4.
SRB for vibrating screens have 4 groups of clearances.
Cage
For CA-type SRB, the cage generally uses solid cages such as brass, bronze or carbon steel, and for C-type spherical roller bearings, the cage generally uses steel stamping cages. For bearings with non-standard structure cages, please contact ZWZ in advance.
Equivalent dynamic load
When Fa/Fr≤e,
P＝Fr+Y1 Fa
When Fa/Fr＞e,
Pr＝0.67Fr+Y2 Fa
The values of e, Y1 and Y2 can be found in the bearing dimension table.
Equivalent static load
P0=Fr+Y0Fa
The values of e, Y0 can be found in the bearing dimension table.
Code description
ACA SRB, with movable guide ring and asymmetric rollers.
C SRB, inner ring without ribs, with movable guide ring, symmetric rollers and pressed cage.
CA SRB, inner ring without centre rib, with small ribs on both sides, symmetric rollers and solid brass cage.
CAB-CA SRB, perforated in the middle of the roller, with pillar cages.
CABC-CAB SRB, the roller guiding method has been improved (roller surface roughness, raceway surface roughness, heat treatment method change, etc.) to reduce friction.
CAC-CA SRB, the roller guiding method has been improved (roller surface roughness, raceway surface roughness, heat treatment method change, etc.) to reduce friction.
CB Continuous casting bearing.
CC CC SRB, the roller guiding method has been improved (roller surface roughness, raceway surface roughness, heat treatment method change, etc.) to reduce friction.
/C3 The clearance conforms to the 3 groups stipulated by the standard.
/C4 The clearance conforms to the 4 groups stipulated by the standard.
/C9 Bearing clearance is different from current standards.
/CRA9 Bearing radial clearance is non-standard, and axial clearance is required.
D Split bearing.
F1 Carbon steel.
F3 Ductile cast iron.
/P5 Tolerance level conforms to the standard Level 5.
/P6 Tolerance level conforms to the standard Level 6.
/HA The rings, rolling elements and cages or only the rings and rolling elements are made of vacuum smelted bearing steel.
20Cr2Mn2MoA；/HC2-15Mn；/HC3-G20CrMo）
/HC The rings and rolling elements or only the rings or only rolling elements are made of carburizing steel (/HC-20Cr2Ni4A；/HC1 20Cr2Mn2MoA；/HC2-15Mn；/HC3-G20CrMo).
/HCR Represented as a difference in the same specification, only the rolling element is made of carburizing steel.
/HG2-GCr18Mo；/HG3-42CrMo；/HG4-GCr15SiMn）
/HG The rings and rolling elements or only the rings are made of other bearing steels (/HG-5GrMnMo; /HG1-55SiMoVA; /HG2-GCr18Mo; /HG3-42CrMo; /HG4-GCr15SiMn).
K Tapered bore bearing, with taper of 1:12.
K30 Tapered bore bearing, with taper of 1:30.
L Light alloy solid cage. When the cage material changes, use additional numbers to indicate.
N There is a snap groove on the outer ring of the bearing.
NR There is a snap groove on the outer ring of the bearing, with a snap ring.
Q1 Aluminum iron manganese bronze.
-2RS Bearings with RS seal on both sides.
-2RS2 Bearings with steel frame fluorinated rubber seals on both sides.
S When the inner diameter is less than 65mm, the structure is similar to the CC type, and the cage outline is composed of two broken lines.
/S0 The bearing rings are tempered at high temperature and the working temperature can reach 150℃.
/S1 The bearing rings are tempered at high temperature and the working temperature can reach 200℃.
/S2 The bearing rings are tempered at high temperature and the working temperature can reach 250℃.
/S3 The bearing rings are tempered at high temperature and the working temperature can reach 300℃.
/S4 The bearing rings are tempered at high temperature and the working temperature can reach 350℃.
SDB Structure code, single-row SRB, with self-aligning and certain axial displacement ability.
TN1 Nylon.
V Full complement of rolling elements (without cage).
VB Vibrating screen bearing
/W 20 There are three lubricating holes (no oil grooves) on the outer ring of the bearing.
/W 33 There are oil grooves and three lubricating holes on the outer ring of the bearing.
/W 33T There are eight lubricating holes on the outer ring of the bearing.
/W 33X There are oil grooves and six lubricating holes on the outer ring of the bearing.
X1 The outer diameter is non-standard.
X2 The width (height) is non-standard.
X3 The outer diameter and width (height) are non-standard (standard inner diameter).
YAB The structure and technical requirements are changed at the same time.
YAD For the same type of bearing, the structure has more than two changes at the same time.
YA1 The outer surface of the bearing outer ring is different from the standard design.
YA2 The inner bore of the bearing inner ring is different from the standard design.
YA3 The end face of the bearing ring is different from the standard design.
YA6 The assembly chamferof the bearing is different from the standard design.
YA7 The rib or guide ring of the bearing is different from the standard design.
YA8 The cage structure is changed.
YB2 Bearing size and tolerance requirements change.
/Z Bearing vibration acceleration level extreme value group (Z1- has the specified extreme value of vibration acceleration level; Z2- extreme value of vibration acceleration level is less than Z1 group; Z3- extreme value of vibration acceleration level is less than Z2).
/V Bearing vibration acceleration level extreme value group (V1- has the specified extreme value of vibration acceleration level; V2- extreme value of vibration acceleration level is less than Z1 group; V3- extreme value of vibration acceleration level is less than V2).
3D graphics
2D graphics
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