SBB have two rows of balls, the outer ring has a common concave spherical raceway, and the center of curvature is the same as the center of the bearing. Even if the inner ring, the steel ball and the cage are slightly inclined relative to the outer ring, they can rotate. Therefore, the bearing is self-aligning and will not be affected by the misalignment of the shaft relative to the bearing housing. It is mainly used to bear radial load, but can also bear a small amount of axial load, and generally cannot bear pure axial load. It is especially suitable for bearing applications where considerable shaft deflection or misalignment may occur. For example, precision instruments, low-noise motors, transmission shafts of automobiles, motorcycles, woodworking machinery, textile machinery, mining machinery, electromechanical equipments, plastic machinery, office equipments, medical equipments, fitness and sports equipments, and general machinery, etc. are the most widely used type of bearings in the machinery industry.
The Self Aligning Ball Bearings currently produced by ZWZ can be roughly divided into the following structural types：
Self Aligning Ball Bearings
Tolerance
The tolerance class of ZWZ standard SBB meets the requirements in GB/T 307.1.
3D graphics
2D graphics
ZWZ standard SBB have 2, standard (N), 3, 4 and 5 class internal clearances, all of which are in line with GB/T 4604.1. The tapered hole SBB use 3 sets of clearance as the standard. The value applies to unmounted and unloaded bearings. Bearings with internal clearance greater than or less than the standard value can also be produced according to user requirements.
The cage generally adopts stamped cage, solid brass cage and nylon cage. The materials are steel, brass and synthetic resin, etc.
When the outer diameter of the bearing D≤200mm, use the stamped steel plate (belt) cage, without marks of cage suffix.
When the outer diameter of the bearing D>200mm, use the solid brass cage, without marks of cage suffix.
The operating temperature of nylon cage bearings can reach up to +120℃. For bearings that need to operate continuously under high temperature or harsh conditions, a solid brass cage can be considered. For bearings with non-standard cages, please contact ZWZ in advance.
Equivalent dynamic load
When Fa/Fr≤e，
P＝Fr+Y1Fa
When Fa/Fr＞e，
P＝0.65Fr+Y2Fa
The values of e, Y1 and Y2 in the formula can be found in the bearing table.
Equivalent static load
P0=Fr+Y0Fa
The values of Y0 in the formula can be found in the bearing table.
The Cylindrical Roller Bearings currently produced by ZWZ can be roughly divided into the following structural types：
ZWZ produces single-row, double-row and four-row CRB with tolerances of up to Class 4, and also produces double-row cylindrical roller bearings with special tolerances of Class SP and UP for machine tool spindles.
Radial internal clearance
The standard products of ZWZ single-row CRB have basic radial clearance, and also can have 3, 4 groups of clearance.
The standard products of ZWZ double-row CRB have 1 group of clearance, cylindrical bore bearings also can have 2, 3 groups of clearance, and tapered bore bearings also can have 2 groups of clearance.
The standard products of ZWZ four-row CRB have 3 groups of clearance, and other clearance products are also available.
Bearings with radial clearance greater than or less than the standard value can also be produced according to user requirements.
Cage
Single-row CRB mostly use vehicle solid cages, stamping cages, nylon cages, etc. Double-row cylindrical roller bearings mostly use turned brass cage, sometimes can also use nylon cages. Four-row cylindrical roller bearings mainly use turned brass cage, and for larger size, turned solid pillar cages shall be used.
/C9T Double-row CRB have different clearances between the two rows of raceways.
D Split bearing.
DR Two rows of split bearings are used in pairs.
E Internal design change with reinforced structure. (The raceway size conforms to the current national standard (reinforced type), and the roller diameter and the length are increased compared with the non-reinforced type.)
FC…ZW Four-row CRB with single inner ring, double outer rings with double ribs, and two rows of rollers against each other.
J Pressed sheet-steel cage, with additional number distinction when the material has a change.
JA Steel plate stamping cage with outer ring guide.
JE Stamping cage of hardened steel plate after phosphating treatment.
K Tapered bore bearing, with taper of 1:12.
K30 Tapered bore bearing, with taper of 1:30.
L Light-alloy solid cage. When there is a change in the cage material, it shall be indicated by an additional number.
LA Light-alloy solid cage with outer ring guide.
LB Light-alloy solid cage with inner ring guide.
M Brass solid cage.
MA Brass solid cage with outer ring guide.
MB Brass solid cage with inner ring guide.
N There is a snap groove on the outer ring of the bearing.
NB Narrow inner ring bearing.
NB1 Narrow inner ring bearing, with narrow on one side.
NC Narrow outer ring bearing.
NR The bearing has a snap groove on the outer ring with a snap ring.
N1 The outer ring of the bearing has a positioning notch.
N2 The outer ring of the bearing has two or more symmetrical positioning notches.
Q Bronze solid cage, with additional numbers to indicate different materials.
/QR Combination of four CRB with equal distribution of radial loads.
R The outer ring of the bearing has a stop rib (flange outer ring).
-RS One side of the bearing is equipped with a skeleton rubber sealing ring.
-2RS Bearings with RS seals on both sides.
-RSZ One side of the bearing is equipped with a skeleton rubber sealing ring (contact type) and the other side is equipped with a dustproof cover.
-RZ One side of the bearing is equipped with a skeleton rubber sealing ring (non-contact).
-2RZ Bearings with RZ seals on both sides.
S Martensite quenching.
VB Vibrating screen bearing.
W B Wide inner ring bearing (double-sided width).
W B1 Wide inner ring bearing (one-side width).
W C Wide outer ring bearing.
X CRB fully equipped with flat retaining ring rollers.
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).
-Z Bearing with shield on one side .
-2Z Bearing with shield on both sides.
