What Are Our Concerns About Bearings（44）

Q1:What is the model of single row tapered roller bearing with outer diameter of 8 cm and inner diameter of 4.5 cm?  

A:Single-row tapered roller bearings with 8 cm outside diameter and 4.5 cm inside diameter are 33109, with an inside diameter of 45mm, an outside diameter of 80mm, and a thickness of 20.5mm  

Q2:Do single row tapered roller bearings function as self-aligning?

A:Can’t;  Single row tapered roller bearings play a one-way thrust role, self-aligning is double row automatic self-aligning bearings  Can’t;  Single row tapered roller bearings play a one-way thrust role, self-aligning is double row automatic self-aligning bearings.

Q3:A bearing knows the inside and outside diameter, how to calculate its type?

A:Only the inner diameter of the bearing can be calculated, which is usually multiplied by 5 after 2 digits.  

For example, the inner diameter of 209 is φ45, the inner diameter of 306 is φ30,6319 is φ135.  The first 2,3 or 63 are the wide/narrow series numbers of bearings.  Can not directly calculate the size, can only look up the table.  

Q4:Bearing model with the letters DB,DF? What’s the difference?

A:[/DB- back to back in pairs; /DF- face to face in pairs]  

Detachable outer ring of L- detachable bearing;  R- without a detachable inner or outer ring;  K-roller and cage assembly;  WS- Thrust cylindrical roller bearing ring;  GS- thrust cylindrical roller bearing ring;  LR- Bearing with detachable inner or outer ring on rolling body assembly.  Bearing rear code: AC- Angular contact ball bearing with nominal contact Angle A =25°;  B-① Angular contact ball bearing with nominal contact Angle A =40° ② Tapered roller bearing with increased contact Angle;  C-① Angular contact ball bearing with nominal contact Angle A =15° ② Aligning roller bearing design change;  E-reinforced cylindrical roller bearing with inner ring without flange;  ZW- Double row needle roller holder assembly;  K-tapered hole bearing, taper 1:12;  K30– Tapered bore bearing, taper 1:30;  2K-double taper hole bearing, taper 1:12;  – RS-Bearing side with sealing ring (contact type);  -RZ- Bearing with sealing ring on one side (non-contact);  -Z- Bearing side with dust cover;  Q- Please lift the cage at the same time;  M-brass cadaver holder;  L-light alloy body cage;  T-phenolic laminate tube solid holder;  J-copper plate stamping cage;  W-welding cage;  /P5- Accuracy level 5;  /C1- Clearance meets 1 group standard;  /C9- Bearing clearance is non-standard;  /DB- mounting bearings back to back in pairs;  /DF- Mounting bearings face to face in pairs  

Q5:Internal longitude 90 external longitude 160 height 40, dhat model is ouble row roller aligning bearing ? 

A:It should be GB/T286-1964(abolished) light and wide series of double row centripetal spherical roller bearings D= 90,D=160,B=40  

Q6:Outer diameter 320 inner diameter 150 wide 90, what is the model of tapered roller bearing?

A：The new model 32330, the old model 7630E dimensions 150*320*114 This model total width 114mm, inner ring width 108mm, outer ring width 90mm

If the total width is 90, it is a non-standard size and can be designed and manufactured

Q7:Can the inner and outer rings of the same type of single row cylindrical roller bearing pass interchangeably in assembly?

A:Cannot commonly, saying is to have been installed when leaving factory strictly, actually also did not have so strict now, install go up can turn went

Q12:What does NSK taper roller bearing model suffix XJ represent?

A:X: Adopt ISO 355 standard

J: The small-end diameter, Angle and outer ring width of outer ring track of tapered roller bearings are consistent with ISO regulations

Q8:What is the model of tapered roller bearing?

A:Tapered roller bearings are class 7 bearings

The old code names all start with seven

The new code names all start with threes

Q9:What are the characteristics of thrust ball bearings and thrust roller bearings? Which is better?

A:Thrust ball bearings generally have better centripetal performance but smaller load than thrust roller bearings.

The thrust ball bearing is designed to withstand thrust load when running at high speed and consists of a gasket-like ring with a ball rolling groove. Because the ring is cushion type, thrust ball bearing is divided into flat base cushion type and adjustable thrust ball bearing Hheey center spherical cushion type. In addition, the bearing can withstand axial load, but not radial load.

Thrust roller bearings can carry large loads

Thrust roller bearings are used to bear combined axial and radial loads mainly in axial direction, but the radial load shall not exceed 55% of the axial load. Compared with other thrust roller bearings, this kind of bearing has lower friction coefficient, higher speed and self-aligning performance. Thrust cylindrical roller bearing and thrust roller bearing are suitable for the occasion of low speed, the speed of thrust tapered roller bearing is slightly higher than that of thrust cylindrical roller bearing.

Thrust cylindrical roller bearings are separated bearings, which can only bear unidirectional axial load and slight impact, and can limit the axial displacement of the shaft (or housing) in one direction, so they can be used for unidirectional axial positioning. But its carrying capacity is far greater than that of thrust ball bearings. When the roller rolls, the roller will inevitably slide on the raceway due to the different linear speeds at both ends of the roller. Therefore, the ultimate speed of this kind of bearing is lower than that of thrust ball bearing, and it is usually only suitable for low-speed operation occasions.

Q10:What is the meaning of CA type in self-aligning roller bearings?

A:CA represents that the cage inside the bearing is an integral brass structure. A structure without external oil grooves and oil holes