Clearance adjustment can be omitted Cylindrical Roller Bearings NU216
2022年3月28日
Boutique Bearings Cylindrical Roller Bearings N203
PRODUCT NAME:Cylindrical Roller Bearings
PRODUCT APPLICATION FIRLD:The rolling body is the centripetal rolling bearing of cylindrical roller. The inner structure of cylindrical roller bearing adopts rollers to be arranged in parallel, and there is a spacer or isolation block between rollers, which can prevent the tilt of rollers or friction between rollers, and effectively prevent the increase of rotating torque.
| Model | N203 | Precision Rating | p5、p6、p0 |
| d(mm) | 17 | weight | 0.078 |
| D(mm) | 40 | Material | chrome steel |
| B(mm) | 12 | Brand | BDL |
| Type | Cylindrical Roller Bearings |
Introduction:
Cylindrical roller and raceway for line contact bearings. Large load capacity, mainly bearing radial load. The friction between the rolling body and the rim of the ring is small, suitable for high-speed rotation. According to whether the ring has a rim or not, it can be divided into NU, NJ, NUP, N, NF and other single-row cylindrical roller bearings, and NNU, NN and other double-row cylindrical roller bearings. The bearing is a detachable structure with inner ring and outer ring.Cylindrical roller bearings with inner or outer rings without fenders, whose inner and outer rings can move relative to each other in axial direction, can be used as free-end bearings. Cylindrical roller bearings with double rim on one side of the inner and outer rings and a single rim on the other side of the ring can withstand a certain degree of axial load in one direction. Generally used steel plate stamping cage, or copper alloy car solid cage. But some use polyamide forming cages.
Characteristic:
1. Roller and raceway are in line contact or downline contact, radial bearing capacity is large, suitable for bearing heavy load and impact load.2. Small friction coefficient, suitable for high speed, limit speed close to deep groove ball bearings.
3. N type and NU type can be moved in axial direction, can adapt to the change of the relative position between the shaft and the shell caused by thermal expansion or installation error, can be used as free end support.
4. The processing requirements for shafts or seat holes are high. After bearing installation, the relative deviation of the outer ring axis should be strictly controlled to avoid contact stress concentration.
5. The inner ring or outer ring can be separated for easy installation and disassembly [1].
Product characteristics;
Cylindrical roller and raceway line contact, radial load capacity. Suitable for bearing heavy load and impact load as well as high speed rotation.
Cylindrical roller bearing raceway and rolling body are geometric shape. After the improved design, it has a higher bearing capacity. The new structure design of the retaining edge and the roller face not only improves the axial bearing capacity of the bearing, but also improves the lubrication conditions of the contact area between the roller face and the retaining edge, and improves the performance of the bearing.
Structure:
1. Cylindrical roller bearing this kind of bearing can accept large radial load, high limit speed, does not bind the axial displacement of the shaft or shell, can not accept axial load.2. Cylindrical roller bearings NJ0000 and NF0000 with both inner and outer rings can bind the axial displacement of shaft or shell in one direction, and can accept small unidirectional axial load. NU0000+HJ0000, NJ0000+HJ0000 and NUP0000 bearings can bind the axial displacement in two directions of the shaft or shell in the axial clearance field of imported bearings, and can accept small bidirectional axial loads.
Cylindrical roller bearing category:
Cylindrical roller bearing belongs to the separation bearing, which is very convenient to install and disassemble. Cylindrical roller bearings can bear large radial loads and are suitable for high-speed operation.This kind of bearing allows the Angle error (inclination) of inner ring axis and outer ring axis to be very small, only 2 '~ 4'.
Therefore, the machining accuracy of the shaft and bearing seat is relatively high otherwise, it is easy to appear uneven load or stress concentration in the raceway contact part. However, the stress concentration can be reduced by modifying the roller or raceway contact bus.
Cylindrical roller bearings can be divided into single row, double row and multi-row cylindrical roller bearings and other different structures according to the different number of rolling columns. Bearings of different structures are also shown in the position design of the guard edge.
The commonly used cylindrical roller bearings have the following forms:
Single row cylindrical roller bearings: Single row cylindrical roller bearings are separable bearings for easy installation and disassembly. Both rings can be fitted tightly. Modified contact lines between rollers and raceways can reduce stress concentration.Double row cylindrical roller bearing: Double row cylindrical roller bearing is a kind of moving bearing, and its separability makes it easy to install and disassemble. Both rings can be fitted tightly. Double row cylindrical roller bearings are almost not allowed to have slant angles.
1. Single row bearings
N, NU type,N type bearing outer ring without retaining edge, both sides of the inner ring with retaining edge. Displacement in both axial directions between the shaft and the housing can be allowed. The bearing of NU type has flange on both sides of the outer ring and no flange on the inner ring. Displacement in both axial directions between the shaft and the housing can also be allowed. Therefore, this structure is suitable for use as a moving end bearing.NJ, NF,NJ bearing outer ring on both sides of the retaining edge, the inner ring has a unilateral retaining edge. It can bear a certain amount of unidirectional axial load. The outer ring of NF type has a flange on one side, and the inner ring has a flange on both sides. It can also bear a certain amount of unidirectional axial load. Therefore, this kind of structure is suitable for use as a single direction axial positioning bearing.
NUP, NFP, AND NUP bearings have outer ring edges on both sides, one side of the inner ring has a (fixed) single ring, and the other side has a detachable flat ring. It can bear a certain amount of bidirectional axial load. The NFP bearing outer ring has a (fixed) single retaining edge on one side, and a detachable flat retaining ring on the other side, with retaining edges on both sides of the inner ring.
It can also bear a certain amount of bidirectional axial load. This kind of structural bearing can limit the displacement of the shaft relative to the bearing seat in two axial directions. Therefore, it is suitable for use as fixed end bearings.
NH (NJ+HJ) type,NH type bearing is a combination of NJ type bearing and HJ type oblique retaining ring structure. Because the inner ring of NUP type bearing is shorter, plus the flat retaining ring is not fixed, it is not convenient to use, while the NH type bearing can use the width of the whole inner ring of NJ type bearing to keep closer match with the shaft. Moreover, NH bearing is more convenient to install and disassemble. NH type bearings can limit the displacement of the shaft relative to the bearing seat in two axial directions. Therefore, it is suitable for use as fixed end bearings.
2. Double row bearings
Double row cylindrical roller bearings have cylindrical bore and conical bore (bearing post-code plus K) two structures. This kind of bearing has the advantages of compact structure, large rigidity, large bearing capacity and small deformation after load, especially suitable for machine tool spindle support.Conical inner hole can also play a role of micro-adjustment of clearance, and can simplify the positioning device structure, convenient installation and disassembly.
Commonly used double row cylindrical roller bearings have the following forms:
NN, NNU type,NN type bearing has no flange on the outer ring, and a middle flange on both sides of the inner ring. Two directional axial displacements can be allowed between the shaft and the housing.The outer ring of NNU bearing has a retaining edge on both sides and a middle retaining edge in the middle, and the inner ring has no retaining edge. Two directional axial displacements can be allowed between the shaft and the housing. Therefore, this structure is suitable for moving end bearings. The retainer of this type of bearing mostly adopts the vehicle solid retainer.
NNF type,NNF type bearing is double row full cylindrical roller bearing, bearing by a middle rim outer ring, two with double rim inner ring structure. The roller is guided by the rim of the inner ring, and the two inner rings are held together by fastening rings. In addition to bearing a large radial load and axial load, the structure can also bear overturning moment, so it is often used as fixed end bearings.
Contact seals are used on both sides of NNF bearings. The bearing is filled with grease, and the working temperature of the grease is from -50℃ to +110℃, but due to the limitation of the sealing material, the working temperature of the bearing is limited to -40℃ to +80℃. In the case of good working condition, there is no need to maintain the NNF bearing with seal. If the bearing is in the environment of water vapor or pollution for a long time, and when it is running at medium or high speed, supplementary lubrication can be carried out on the bearing through the lubricating oil groove and lubricating oil hole on the outer ring.
Four row bearings
Four-row cylindrical roller bearings are mainly used in rolling machines such as cold rolling mill, hot rolling mill, billet cutter, etc.
Bearing is of separate structure, bearing ring and rolling body components can be easily separated, therefore, bearing cleaning, inspection, installation and disassembly are very convenient.
FC type bearing is composed of two outer rings and an inner ring, each outer ring on both sides of the retaining edge in the middle of the retaining edge, the inner ring without retaining edge.
FCD type bearings are actually composed of two NN type bearings.
FC and FCD bearings allow two directions of axial displacement between the shaft and the housing. Therefore, this structure is suitable for moving end bearings. The cage of this type of bearing mostly adopts the carry-made entity 13:58.
Accuracy grade:
Cylindrical roller bearings can be divided into PO,P6, P5,P4, P2 according to the accuracy grade. The accuracy grade is sorted from low to high.Radial clearance adjustment method of cylindrical roller bearing:
The commonly used methods to adjust the radial clearance of fully loaded cylindrical roller bearings are as follows:
1. For the backlash of cylindrical and oval bearing bush, it can be adjusted by manual scraping or by repairing and scraping after turning with cushion in the bearing surface.
2, for the top clearance of cylindrical and oval bearing bush can be manually scraped or if the situation permits, the method of adding pad in the bearing surface adjustment.
3, for multi oil wedge fixed bearing, in principle, it is not allowed to repair scraping and adjust the bearing gap, the gap should be replaced when appropriate.
4. For multi wedge tilting bearing, it is not allowed to repair and scrape tiles, and the gap should be replaced due to tiles when appropriate. For the tile with adjustable thickness, stainless steel pad can be added under the tile back adjustment block, or the method of thinning adjustment block thickness can be used to adjust the tile amount. Note that for multi-wedge tilting bearing, the thickness error between the same group of tiles should be less than 0.01mm.
Application:
Large and medium-sized electric motors, rolling stock, machine tool spindles, internal combustion engines, generators, gas turbines, reduction boxes, rolling mills, vibrating screens and lifting and transportation machinery, etc.
11.How do I start purchase?
You can email or contact with our online salesman, then get offer and shipping cost for our order. After your confirm, our salesman will send u lnvoice.After payment done, we will ship goods on time.
22. Do you have stock for all item?
Yes, we have sufficient stock and do fast delivery.
33. What about the delivery?
By express(DHL, UPS, FEDEX, TNT, EMS) to your door; By sea to your nearest port; By air to your nearest airport.
44. What about the payment?
By TT, Western Union, Moneygram or paypal.
55. What about the lead time?
For stock goods, 1-3 days after payment.
66. Warranty
All our products are brand new. We provide one year warranty.
77. Could you accept OEM and customize?
YES, OEM is accepted and we can customize for you according to sample or drawing.
| Boutique Bearings Cylindrical Roller Bearings N203 |