Saturday, August 6, 2022

Precautions for bearing type selection





 "Various types of bearings have different characteristics due to different designs. Due to the specific mounting position of the bearing and the variability and complexity of the application, there is no fixed mode for bearing type selection, which can be adapted to the specific mounting position of a host. When selecting the bearing type according to the application conditions, it is recommended to comprehensively consider the following main factors.”

allow space

In mechanical design, the size of the shaft is generally determined first, and then the bearing is selected according to the size of the shaft. Usually, ball bearings are used for small shafts; cylindrical roller bearings, spherical roller bearings, tapered roller bearings (sometimes ball bearings are also optional) for large shafts. If the radial space of the bearing installation part is limited, the bearing with a smaller radial section height should be used. Such as needle roller bearings, certain series of deep groove ball bearings, angular contact ball bearings, cylindrical or spherical roller bearings and thin-walled bearings. If the axial space of the bearing installation part is limited, a bearing with a smaller width can be used.

bearing load

The magnitude of the load The magnitude of the load is often the determining factor in the selection of bearing size. Roller bearings have a higher load carrying capacity than ball bearings with the same external dimensions. Generally, ball bearings are suitable for light or medium loads, and roller bearings are suitable for heavy loads.

Load mode Pure radial load can choose deep groove ball bearing and cylindrical roller bearing. For pure axial load, thrust ball bearing and thrust cylindrical roller bearing can be selected. When there is radial load and axial load (combined load), angular contact ball bearings or tapered roller bearings are generally used. If the radial load is large and the axial load is small, the bearing is professional! Deep groove ball bearings and cylindrical roller bearings with ribs on the inner and outer rings can be selected. If there is also large deformation of the shaft or housing and poor installation alignment, self-aligning ball bearings and self-aligning roller bearings can be selected. If the axial load is large and the radial load is small, the thrust angular contact ball bearing can be selected. If the four-point contact ball bearing also requires self-aligning performance, the thrust spherical roller bearing can be selected.

Rotating speed

The working speed of the rolling bearing mainly depends on its allowable operating temperature. Bearings with low frictional resistance and less internal heat generation are suitable for high-speed operation. When only bearing radial load, select deep groove ball bearing and cylindrical roller bearing can achieve higher speed, if bearing combined load, should choose angular contact ball bearing. Using specially designed high-precision angular contact ball bearings, it can reach extremely high speeds. The rotational speed of various thrust bearings is lower than that of radial bearings.

Rotation accuracy

For most machines, the use of 0-grade tolerance bearings is sufficient to meet the requirements of the host, but when there are strict requirements on the rotation accuracy of the shaft, such as machine tool spindles, precision machinery and instruments, deep groove ball bearings with higher tolerance levels should be selected. Angular contact ball bearings, tapered roller bearings, cylindrical roller bearings and thrust angular contact ball bearings.


rigidity

The rigidity of rolling bearings is determined by the amount of elastic deformation that occurs when they are under load. In general, this deformation is small and can be ignored, but in some machinery, such as machine tool spindle systems, the static stiffness and dynamic stiffness of the bearing It has a great influence on the characteristics of the system. Bearing people WeChat professional! In general, roller bearings have higher stiffness than ball bearings. Various types of bearings can also improve the rigidity to varying degrees by properly "preloading".


Noise and Vibration

The noise and vibration of the bearing itself are generally very low. However, for small and medium motors, office machinery, household appliances and instruments that have special requirements for noise and running stability, low-noise bearings are usually selected.

Axial movement

The most common configuration method of bearings is to install a set of axially positioned "fixed bearings" at one end of the shaft and a set of axially movable "floating bearings" at the other end to prevent thermal expansion and contraction of the shaft. A stuck phenomenon occurs. The commonly used "floating bearing" is a cylindrical roller bearing with no ribs on the inner ring or outer ring. At this time, the fit between the inner ring and the shaft or the fit between the outer ring and the housing hole can be interference fit. Sometimes non-separable deep groove ball bearings or spherical roller bearings can also be used as floating bearings, but during installation, the inner ring and the shaft or the outer ring and the housing hole should be matched with a clearance fit to ensure that the inner ring or outer ring has a sufficient freedom of axial movement.


friction torque

The frictional resistance of the ball bearing is smaller than that of the roller bearing. When the pure radial load acts, the frictional resistance of the radial contact bearing is small; when the pure axial load acts, the frictional resistance of the axial contact bearing is small; when the combined load acts, the bearing contacts Angular contact bearings with angles close to the load angle have the least frictional resistance. In instruments and machinery that require low friction torque, ball bearings or cylindrical roller bearings are more suitable. Bearing people WeChat professional! In addition, contact seals should be avoided for low-friction torque bearings. At the same time, drip lubrication, oil-air lubrication or other lubrication methods that are conducive to reducing friction are recommended.

Installation and removal

Bearings with cylindrical inner holes are used in machinery with frequent installation and disassembly, and separate angular contact ball bearings, tapered roller bearings, separable cylindrical roller bearings, needle roller bearings and thrust bearings should be preferred. The bearing with conical inner hole can be installed on the journal, or on the cylindrical journal by means of an adapter sleeve or a withdrawal sleeve, and the installation and disassembly are very convenient.

I want thies baring for my renult dustur

Dear Sir, Please quote your best price for 16105 ZZ SKF Qty 50Pcs

Dear Sir, We take the opportunity to introduce ourselves as Dealers of Bearing & other transmission products in Chennai . INDIA. We require 


the above bearing quantity 2 nos. Request you to kindly quote for the same. Thanks & warm Regards, Ajit Malhotra.

ขอใบเสนอราคาสินค้า Product Model: F204 Structure: roller bearing Inside Diameter: 20 mm/inch Outside Diameter: 86 mm/inch Thickness: 64 mm/inch

please quote price and availibiltiy

Hello good day            I need a budget for the following item: 822-2Z-T9H 100 pieces I await response. graciously Rafael F. 


Brunet

Angular Contact Ball Bearing Installation Methods, Skills and Quality Discrimination Misunderstandings



Angular contact ball bearings can bear both radial and axial loads. Can work at higher speeds. The larger the contact angle, the higher the axial load carrying capacity. The contact angle is the angle between the line connecting the contact points of the ball and the raceway in the radial plane and the line perpendicular to the bearing axis. High-precision and high-speed bearings usually take a 15-degree contact angle. Under the action of axial force, the contact angle will increase. Angular contact ball bearings have raceways on the inner and outer rings, and the inner and outer rings can make relative displacements along the bearing axis. Bearings of this type are particularly suitable for combined loads, i.e. loads acting both radially and axially. The axial load bearing capacity of angular contact ball bearings increases with the increase of the contact angle α. The contact angle is the angle between the line connecting the contact points of the ball and the raceway in the radial plane and the line perpendicular to the bearing axis.


Whether the angular contact ball bearing is installed or not will affect the accuracy, life and performance of the bearing. Therefore, please fully study the bearing installation, that is, please install the bearing according to the operating standards including the following items.


Angular contact ball bearing installation method


1. Clean the bearings and related parts (for grease-lubricated bearings and both sides with oil seals or dust caps, there is no need to clean the bearings with seal rings before installing them.)


2. Check the size and finishing of related parts


3. Installation method


The installation of angular contact ball bearings should be determined according to the bearing structure, size and the matching nature of the bearing components. The pressure should be directly applied to the end face of the ferrule with a tight fit, and the pressure should not be transmitted through the rolling elements. The bearing installation generally adopts the following methods:


The installation of angular contact ball bearings is more complicated than that of deep groove ball bearings. Most of them are installed in pairs and require preloading. Good installation can greatly improve the working accuracy and bearing life of the main engine; otherwise, not only the accuracy will not meet the requirements, but the life will also be affected.


The installation forms of angular contact ball bearings are back-to-back, face-to-face and series.


When installed back-to-back (the wide end faces of the two bearings are opposite to each other), the contact angle of the bearing spreads along the direction of the rotation axis, which can increase the rigidity of its radial and axial support angles, and has the greatest resistance to deformation; face-to-face (the narrow end faces of the two bearings are opposite) During installation, the contact angle of the bearing converges toward the axis of rotation, and its ground bearing angle is less rigid. Since the inner ring of the bearing protrudes from the outer ring, when the outer rings of the two bearings are pressed together, the original clearance of the outer ring is eliminated, which can increase the preload of the bearing; when arranged in series (the wide end faces of the two bearings are in one direction) when installed , the contact angle lines of the bearing are in the same direction and parallel, so that the two bearings can share the working load in the same direction. However, when using this type of installation, in order to ensure


To ensure the axial stability of the installation, two pairs of bearings arranged in series must be installed opposite to each other at both ends of the shaft.


Features of double row angular contact ball bearings


Premium Steel: Ultra-clean steel bearings extend life by up to 80%.


Advanced Grease Technology: Seiko grease for extended life and performance.


Premium Ball: Quiet and smooth operation that keeps running smoothly even with high growth.


Super Finished Raceway: Specially honed to reduce noise and improve lubricant distribution and life.


Contact Angles: 15, 25, 30 and 40 degrees open.


Patented sealing provides resistance to contamination in the harshest environments.


Cage: Available in nylon, steel, copper cage assembly range.


Quality Assurance: 100% tested to ensure the quality of the entire product.


Misunderstanding of Quality Judgment of Angular Contact Ball Bearings


1. Feel the quality of the bearing through the surface. During the process of selling bearings, we found that many customers said that as long as the surface of the angular contact ball bearing is bright, the quality is good, which is wrong. The light on the surface of the imported angular contact ball bearing should be a kind of black light. The reason for this black light is whether the steel used in the bearing meets the standard and its grinding process and the cutting fluid used. The first two are the main ones. .


2. Whether the chamfer is bright or not The chamfer of the angular contact ball bearing does not determine the quality of the bearing, but reflects the processing method of the angular contact ball bearing. The chamfer is black, which means that it has undergone heat treatment such as quenching, which increases the hardness of the bearing. Some people think that the black chamfer is not good-looking because it is not fully processed. This is a misunderstanding.


3. The one-piece cage is better than the two-body cage. Although the new process uses the one-piece cage, it only saves the material of the angular contact ball bearing, and the performance of the rotation is worse than that of the two-body cage. In general, the service life of angular contact ball bearings is related to three factors. One is the quality of imported angular contact ball bearings. The second is the use environment. The third is the installation method.


Analysis of Abnormal Wear of Double Row Angular Contact Ball Bearing Cage


damage phenomenon


Mainly due to the high temperature phenomenon during high-speed operation (over 80 degrees at the positioning bearing gland), the cage wears and breaks, which eventually leads to locking and adhesion, and in severe cases, the roller diameter and bearing box holes are damaged, resulting in large economic losses and labor consumption. material resources.


Cause Analysis


1. Considering the bearing itself


Generally speaking, when the bearing rotation accuracy is low, the clearance is too small, the linear speed of the rolling mill is high, close to the bearing limit speed or exceeding the limit speed, it will lead to high temperature of the bearing, which will lead to a series of problems such as abnormal noise, locking, sticking and so on. . In this incident, the damage to the bearing was all concentrated on the operation side, while the transmission side bearing used the same batch of bearings, which could operate normally without the above problems under the same rotational speed and lubrication conditions. Therefore, the bearing damage caused by the bearing itself can be ruled out temporarily.


2. Size matching


This angular contact ball bearing is installed on the operating side of the roller system, and it mainly limits the axial movement of the shaft and should not bear any radial load. It is the radial clearance of the C3 group. After accounting for this coordination, after the bearing is subjected to radial force during operation, it is all distributed to the main bearing. The angular contact ball bearing does not bear any negative radial load, but only bears the axial load. Therefore, the bearing damage caused by the dimensional fit problem can be ruled out temporarily.


3. Matching problems of end-face contact parts


Carefully check the end faces of the inner and outer rings of the bearing, the damaged bearings basically have abnormal wear on the end faces, and the cage also has serious wear marks. There is abnormal wear on the end face of the boss from the end face of the ring and the outer ring of the positioning bearing in the inner hole of the box, and the surface has pits and thorns. From this, it can be judged that there is serious relative sliding friction between the bearing and the mating contact parts during operation. After the measurement and installation, the outer ring of the bearing is not axially compressed, and there is a gap of 0.5-0.7mm. After the inner ring is locked, there is also a large gap. Therefore, the bearing has a large axial movement during operation. Since the hardness of each accessory is lower than that of the bearing, it is easy to be irregularly worn. When the bearing is subjected to an axial force in a certain direction, the end face The contact surfaces of the opposite mating parts (the end faces have been irregularly worn at this time) cause relative inclination of the inner and outer rings of the bearing. Therefore, the higher the speed, the irregular running of the rolling elements, the larger clamping force and the frequent impact force on the cage, which will cause the wear and tear of the cage.


in conclusion


From the above analysis, we can temporarily judge that the bearing damage caused by the axial fit after installation and the fit of the contact parts in use are the main factors.


Friday, December 28, 2018

Требуется подшипники SKF 23034 CC/W33, 32024 Х/DFC205, SKF NNU 4984B/SPC3W33, Timken 380RX2089

Доброго дня!
Требуется подшипники (см.вложение) по 1 шт
Цена и сроки поставок?
 —
Подшипник SKF 30224 J2/DF — 2
Подшипник FAG 71956-МР-Р6–2
Подшипник Timken 380RX2089 C4 -1
Подшипник FAG PR14135-GR1/0–10- 8
Подшипник SKF 23034 CC/W33- 56
Подшипник Timken М278749DW-902B6 -2
Подшипник SKF ВТ2–8261 А/НА1 -5
Подшипник SKF BFS — 8040- 2
Подшипник SKF NNU 4984B/SPC3W33 -2
Подшипник Timken DX 084495–902A2- 11
Подшипник SKF BT2–8339/HA2- 10
Подшипник SKF Подшипник BT2–0464/HA1–14
Подшипник SKF Подшипник 32024 Х/DFC205 -150
Подшипник SKF Подшипник ВТ2В 331854/НА1–2
Подшипник Timken Подшипник DX 596094–902A2 -36
Подшипник Timken Подшипник DX760136–902A1–20
Подшипник FAG Подшипник F-575208 TR2–25
Подшипник SKF 331249 B -40

slewing rings number: I.850.20.00.C Weight, Mass (M):63.1 kg

New Model/Bearing number: I.850.20.00.C Main demensions:d: 649.2 mm × D: 848 mm × T/B: 56 mm Inside diameter (ID d):649.2 mmOutside diameter (OD D):848 mm Thickness/width (T/B/H):56 mmWeight, Mass (M):63.1 kg
AXRY200-EX
161.16.0630.890.11.1503
CSEC070
VU361350
091.25.1154.990.11.1503
FPAG 2000
RKS.23 411
012.40.2199.301.41.1502
161.45.2654.890.11.1503
1056DSB102y 
061.30.2142.003.21.150
162.20.0710.891.21.1503
FPCA1100
RKS.22 0741
013.50.1600.101.04.03D1 QUY70 Crane slewing rings
VLA 20 0844 N
CRBS 1308 A UU

Internal gear I.750.20.00.C slewing ring bearings 547.2 × 748 × 56 mm (M):53.3 kg

New Model/Bearing number: I.750.20.00.C Main demensions:d: 547.2 mm × D: 748 mm × T/B: 56 mmInside diameter (ID d):547.2 mmOutside diameter (OD D):748 mmThickness/width (T/B/H):56 mmWeight, Mass (M):53.3 kgCategory:Light load slewing bearings (Internal gear type)Material:Based on customer’s needs
I.750.20.00.C large stock in our factory Exporting to Europe from 2008, we are stock: VSU 20 0544 slewing rings INA 5 pcs, 92–20 0741/1–07242 slewing rings IMO 9 pcs, VSA 20 0414 N slewing rings INA 3 pcs, I.505.20.00.C slewing rings Torriani 10 pcs, 10–20 0641/0–02032 slewing rings IMO 7 pcs
013.50.1600.101.04.03D1 QUY70 Crane slewing rings
VLA 20 0844 N
CRBS 1308 A UU
CAT308
2064.30.30.0–0.1455.00
CRBB 25030
XSA 14 0844 N
131.25.1600.001.04.03F1 CRANE QY-80/100T
013.50.1442.001.24.03D1 GT-550E-1 Crane slewing rings
280.30.1400.013 Typ 110/1600.0
133.50.3150.03K2
162.28.1600.890.11.1503
CSCF160
VE104A02
306DBS101y
CSCU110.2RS
FPAF 700

326.5 × 518 × 56 mm Torriani Bearing number: I.505.20.00.C

New Model/Bearing number: I.505.20.00.C Main demensions:d: 326.5 mm × D: 518 mm × T/B: 56 mmInside diameter (ID d):326.5 mmOutside diameter (OD D):518 mmThickness/width (T/B/H):56 mmWeight, Mass (M):35.4 kgCategory:Light load slewing bearings (Internal gear type)
FPXG 700 
XRT220-W 
CRB 3010 
DH370–7 
682DBS102y 
VLA 200944 N 
VI152A04 
060.25.1255.500.11.1503 
T01–00575EAA 
306DBS101y
CSCU110.2RS
FPAF 700
5068.30.28.0–1.1600.00
ESU 20 0844
9229740 JOHN DEERE 600C
SK6–43EZ
161.16.0630.891.21.1503
CRBB 24025
YRT395
CSXG080
133.45.2240.03K1
VSI 20 0844 N
VU 300460
FPAG 700

Thursday, December 27, 2018

Torriani E.1050.20.00.C Torriani (834 × 1046.4 × 56 mm) slewing rings, E.1200.20.00.C 984 × 1198.4 × 56 mm

New Model/Bearing number: E.1050.20.00.C Main demensions:d: 834 mm × D: 1046.4 mm × T/B: 56 mmInside diameter (ID d):834 mmOutside diameter (OD D):1046.4 mmThickness/width (T/B/H):56 mmWeight, Mass (M):82.3 kgCategory:Light load slewing bearings (External gear type)Material:Based on customer’s needs
QMPH30J150SM
CRBC 10020
32209015
FPCB404
6311–2RS1
QAAPF22A115SM
472/Q
129033/166
10B1S26N
231.20.0500.013 Typ 21/650.1
215069
TAPA17K075SM
QVFB20V085SEM
NUP 218 ECP
CSXU0402RS
12B1SNX10FT
DVPF20K307SET
6309–2RS1/GJN
New Model/Bearing number:E.1200.20.00.CMain demensions:d: 984 mm × D: 1198.4 mm × T/B: 56 mmInside diameter (ID d):984 mmOutside diameter (OD D):1198.4 mmThickness/width (T/B/H):56 mmWeight, Mass (M):99 kgCategory:Light load slewing bearings (External gear type)
E.1200.20.00.C large stock in our factory Exporting to Europe from 2008, we are stock: 11–20 0411/1–02112 slewing rings IMO 7 pcs, I.850.20.00.C slewing rings Torriani 5 pcs, 11–20 0841/1–02152 slewing rings IMO 6 pcs, VSI 20 1094N slewing rings INA 8 pcs, 91–20 0841/1–07152 slewing rings IMO 7 pcs, 92–20 1091/1–07272 slewing rings IMO 7 pcs
VU 300460
FPAG 700
SUMITOMO SH200A3 Excavator slewing ring
CSEG120
E.1080.25.00.D.5
CSXAA015
872DBS118y
RKS.062.25.1314
FPXG708
RKS.162.14.0844 
CSCU1102RS
VSU200944
AXRY460-EX
161.50.3000.891.41.1503
XRBC 70070
XRBC 50050
FPXB 400
ER1.45.1595.400–1SPPN
QMFXP09J040SM
HA 317
AT250255 JOHN DEERE 330C LC
SD120A1S11
UCT204
QAAFX15A070SM
6205 TN9/C3
HK 0808
80A1SNX10FT
QMCW18J308SM

Precautions for bearing type selection

 "Various types of bearings have different characteristics due to different designs. Due to the specific mounting position of the beari...