What is the meaning of bearing DN value?

A:Sliding line speed limit DN value [product of bearing inner diameter (mm) and shaft speed (r/min)], foreign studies have been completed on the 6 power bearing DN value is 3.0×10, the present condition of our country is 2.5 to 3.0×10 6 power research goal, there is a certain gap.

Q2:What type of bearing is used for 1511 bearing housing?

A:There are generally two kinds of 1511 bearing seat, one is the bearing with small hole is 1211K, 2211K, 22211K

621, 1211, 2211, 22211 for large pores

Q3:What does F3 in bearing model suffix CAF3 mean?

A:The rear code of the bearing indicates the bearing’s internal structure change, seal dust proof and external shape change, cage and material change, tolerance level, clearance group, configuration form and other characteristics.

CA: C type self-aligning roller bearing, inner ring with flange, movable middle ring, solid cage.

F3: Cage material code, ductile iron. (Good wear resistance)

Q4:What does bearing model letter code mean?

A:CA can be arbitrary (pair in the same direction, face to face or back to back)

CB pair mounted single row angular contact ball bearings

Comparison of internal clearance with normal values before axial installation when CC is arranged back-to-back or face to face: Small (CA), Normal (CB), Large (CC)

G Single row angular contact bearings can be installed arbitrarily (in tandem, back to back, face to face). When the bearings are arranged face to face or back-to-back, there is a certain axial clearance in the front of installation

GA optional (series, back to back, face to face)

GB pair mounted single row angular contact bearings

When GCS are arranged face to face or back-to-back, there is a light (GA) medium (GB) or heavy (GC) preload in the bearing

K tapered inner hole, diameter taper 1:20

K30 tapered inner hole, diameter taper 1:30

-LS bearing is provided with contact oil seal on one side, and there is no oil seal groove in the inner ring

-2LS bearing LS oil seal on both sides

N The cylindrical surface of the outer ring has a stop groove

N2 There are two positioning slots on the outer ring (180 degrees)

PP bearing (supporting roller bearing, CAM following bearing) two sides with contact oil seal

RS bearing (needle roller bearing) has synthetic rubber or polyhydrocarbamate contact oil seal on one side

– One side of RS1 bearing is equipped with pro-steel plate synthetic rubber contact type oil seal

-2RS1 bearing has ES1 oil seal on both sides

-RS bearing (needle roller bearing) with RS oil seal on both sides

– One side of RZ bearing is equipped with pro-steel plate synthetic rubber rub oil seal

-2RZ bearing with RZ oil seal on both sides

X 1: Basic dimensions modified to meet ISO standards

2: column rolling surface (supporting roller bearing, CAM follow bearing)

-z bearing side with dustproof cover (non-friction oil seal)

-2Z bearing is equipped with Z dust cover on both sides

-Zn dust cover position on the other side of the stop groove

-2Zn bearing is equipped with Z dust cover on both sides, and the outer ring is equipped with stop groove

-ZNR is the same as -2Z with a stop ring

-2ZNR is the same as -2Zn with a stop ring

cage

F Steel live special iron making machine cage

J steel plate is stamped into row cage

L Light alloy machine cutting cage

M Brass cutting cage

MP window brass cutting cage

P Glass reinforced nylon 6.6 injection cage

TN plastic mold injection cage

Y Metal plate stamping cage

V Full roller bearing (without cage)

VH Full roller bearings (cylindrical roller bearings) composed of non-separating roller congratulators

Bearing accuracy

P4 Dimensional accuracy conforms to ISO4 tolerance (more precise than P5)

The dimensional accuracy of P4A conforms to ISO4 tolerance, and the motion accuracy is equivalent to AFBMA ABEC9 standard

P5 size and movement accuracy in line with ISO5 tolerance (accuracy higher than P6)

The size and motion accuracy of P6 are equivalent to ABEC9 AFBMA standard

The dimensional accuracy of PA9A is equivalent to ABEC9 level of AFBMA standard, and the operation accuracy is higher than that of PA9A

Internal clearance

The gap of C1 is smaller than that of C2

C2 clearance less than normal grade

C3 gap is greater than normal grade

C4 gap is larger than C3

When the gap suffix is combined with P4,P5 or P6, C is omitted from the gap suffix.

For example: the P6 + C2 = P62

Turn the quality

QE5 MEETS the special standards for electric motors, with dimensions and operation accuracy up to P6 and very low noise

QE6 meets special standards for electric motors.

Heat treatment

S0 up to 150 degrees Celsius

S1 is up to 200 degrees Celsius

S2 is up to 250 degrees Celsius

S3 reaches 300 degrees Celsius

The S4 reaches 350 degrees Celsius

Add lubrication

The outer ring of W33 bearing has three oil holes of lubricating oil groove

W33X bearing outer ring with lubrication groove six oil holes

lubricant

HT High temperature lubrication (-20 to +130 degrees Celsius)

LHT Low/High temperature grease (-40 to +140 degrees Celsius)

LT low temperature grease

MT Medium temperature grease (-30 to +110 degrees Celsius)

Q5:Needle roller bearing size 50 80 45 What is the model?

A:Needle roller bearing inner diameter 50 outer diameter 80 width 45

NA4010 50X80X30 NAV4010 50X80X30

NA6911 55X80X45 RNA6911 63X80X45 NA6911A 55X80X45

Q6:What is the size of HMK2018L bearing?

A:This type is Japanese NTN bearing code , is a heavy series of stamping outer ring needle roller bearings, inner diameter 20, outer diameter 27, height 18, with a seal ring

Q7:What does the bearing type DQY22-225B mean?

A:DQY 22 —225 B

DQY- End cover type spherical plain bearing

No. 22 – bearing

225– Bearing bush nominal diameter (mm), inner diameter.

B– Structural form (type A, Type B)

Type B is a self-ALigning end cover spherical PLAIN BEARING WITH AN AIR seal to balance AIR pressure and prevent low pressure inside the motor, allowing oil and gas to escape through the floating seal ring.

Q8:What does bearing model CK+H mean?

A:The meaning of CK+H in bearing model is bearing with accessory, and the CK before “+” is the suffix of bearing code, such as 22208CK self-aligning roller bearing, whose letter C stands for inner ring without flange, movable middle retaining ring, stamping cage, symmetrical roller and reinforced type; K represents the inner cone hole, taper 1:12; The H after the “+” is the bearing attachment — the type code of the tight sleeve, such as H308.

Q9:How to calculate the amount of interference produced by bearing installation?

A:The following two points are required to calculate the amount of interference:

1.bearing inner diameter tolerance. The size of the bearing inner diameter tolerance zone is determined according to the nominal size of the bearing inner diameter. It is necessary to check the mechanical design manual or national standards;

2.the actual size of the journal;

The size of the bearing inner diameter is subtracted from the size of the journal (nominal size + average tolerance), which is the amount of interference.

Q10:Insulated bearing, ceramic bearing, plastic bearing, which kind of insulation performance is better?

A:Insulating ceramics, which are rare in China, if really used, the price is very high. Ceramic relative to the general bearing steel bearing is relatively high, but the insulation performance is very good. Plastic is relatively cheap.