Product Description:
(Angular Contact Ball Bearings) can withstand both radial and axial loads. They can work at higher speeds. The larger the contact angle, the higher the axial load carrying capacity. High precision and high speed bearings usually take 15 degrees contact angle. Under the action of axial force, the contact angle will increase.
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Name
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Angular contact ballb earings
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Type two
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double row angular contact ball bearings
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Instructure
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Function
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for high frequency motor, entrifuges
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Type one
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Single row angular contact ball bearings
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Feature
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bearings in general-purpose groups and baisc bearings
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conceptual
Angular contact ball bearings
Single-row angular contact ball bearings can only withstand axial load in one direction, when bearing radial load, will cause additional axial force. And can only limit the axial displacement of the shaft or shell in one direction. Angular contact ball bearings have a contact angle of 40 degrees, so they can withstand a large axial load. Angular contact ball bearings are of non-separating design, with shoulders of different heights on both sides of the inner and outer rings. In order to increase the load capacity of the bearings, the shoulders on one of the sides are machined lower, which allows the bearings to be loaded with more steel balls.
Double row angular contact ball bearings can withstand large radial loads mainly radial and axial combined loads and moment loads, limiting the axial displacement of both sides of the shaft. Mainly used to limit the shaft and shell two-way axial displacement of the components in the double row angular contact ball bearing inner and outer ring between the tiltability is limited, allow tilt angle depends on the internal clearance of the bearing, bearing size, internal design and the role of the bearing on the force and torque, and the maximum allowable tilt angle should be to ensure that the bearing will not produce excessive additional stress. If there is a tilt angle between the inner and outer rings of the bearing, it will affect the life of the bearing, and at the same time cause the bearing running accuracy to decrease and the running noise to increase. Double row angular contact ball bearings generally use nylon cage or brass entity cage. Double row angular contact ball bearing installation should pay attention to, although the bearing can withstand two-way axial load, but if one side of the loading ball notch, should pay attention to do not let the main axial load through the notch side of the groove edge. In the bearing use should pay attention to make the side of the raceway without ball loading notch to bear the main load.
Pairs of duplex ball bearings
If mounted in pairs of duplexes, the outer rings of the pair of bearings are fitted opposite each other, i.e. the wide end faces the wide end face and the narrow end faces the narrow end face. In this way, additional axial forces can be avoided, and the shaft or shell can be limited to the axial clearance in both directions.
Because of its inner and outer ring raceway can be in the horizontal axis of relative displacement, so can at the same time bear radial load and axial load - joint load (single row angular contact ball bearing can only withstand a single direction axial load, so generally are often used in pairs of installation).
Keep frame material has brass, synthetic resin, etc., according to the bearing form, use conditions and distinction.
Angular contact ball bearings are more foreign bearing manufacturers, more domestic applications in imported equipment such as angular contact ball bearings 3204RS, etc., the narrow side of the outside, the wide side of the bearing.
The narrow side is outside, the wide side is inside, the other wide side is inside, the narrow side is outside, that is back to back contact.
Characteristic
1、General assembly bearings
General-purpose paired bearings are specially processed, when the bearings are mounted next to each other, any combination can achieve the established internal clearance or preload, as well as the average load distribution, without the use of shims or similar devices.
Paired bearings are used in: when the load carrying capacity of a single bearing is insufficient (using the configuration of tampering) or when it is necessary to withstand combined loads or axial loads acting in two directions (using back-to-back or face-to-face configuration).
2, the basic design of the bearing (can not be used as a general-purpose group), for the configuration of individual bearings
The basic design of single row angular contact ball bearings is mainly used in the configuration of only one bearing in each position. Their width and protrusion are common class tolerances. It is therefore not suitable for mounting two single row angular contact ball bearings close together.
Accuracy class
The accuracy classes of angular contact ball bearings include dimensional tolerances and rotational accuracy. Accuracy from low to high is expressed as P0 (ordinary), P6 (P6X), P5, P4, P2. In addition, European and American brands also use P3, P7, P9 to express the accuracy grade, P3 is equivalent to ISO and JIS standard P6 grade, P7 is equivalent to P4 grade, P9 is equivalent to P2 grade.
Type
There are several types of angular contact ball bearings: Type 7000C (∝=15°), Type 7000AC (∝=25°) and Type 7000B (∝=40°). This type of bearing has a locking port on the outer ring, generally the inner and outer rings cannot be separated, and can withstand combined radial and axial loads as well as axial loads in one direction. The ability to withstand axial load is determined by the contact angle, the larger the contact angle, the higher the ability to withstand axial load. This kind of bearing can limit the axial displacement of the shaft or shell in one direction.
Contact ball bearing limit speed is higher, can bear radial load and axial load at the same time, also can bear pure axial load, its axial load capacity is determined by the contact angle, and with the increase of the contact angle and increased
Single row angular contact ball bearings
Single row angular contact ball bearings can only withstand a direction of the axial load, in bearing radial load, will cause additional axial force, must be applied to the corresponding reverse load, therefore, this kind of bearing are generally used in pairs. Double row angular contact ball bearings can withstand a large radial load mainly radial, axial bi-directional joint load and moment load, it can limit the shaft or shell bi-directional axial displacement, contact angle of 30 degrees.
Bearing code:7
Angular contact ball bearings mounted in pairs
Pair mounted angular contact ball bearings can withstand radial load-based radial, axial bi-directional combined load, can also withstand pure radial load. Tandem configurations can only withstand axial loads in a single direction, while the other two configurations can withstand axial loads in either direction. This type of bearing is generally selected by the manufacturer combination of pairs submitted to the user, after installation, there is a pre-pressure interference, ring and ball in the axial preload state, thus improving the whole set of bearings as a single support stiffness and rotational accuracy.
Back-to-back configuration, the rear code for DB (such as 70000/DB), back-to-back paired bearings of the load line to the bearing axis separation. Axial loads acting in both directions can be accommodated, but loads in each direction can only be accommodated by one bearing. Back-to-back mounted bearings provide a relatively rigid bearing configuration and can withstand tilting moments.
In face-to-face configurations, rear-mounted designation DF (e.g., 70000/DF), the load lines of face-to-face matched bearings converge toward the bearing axis. Axial loads acting in both directions can be accommodated, but the loads in each direction can only be accommodated by one bearing. This configuration is not as rigid as a back-to-back pair and is less suitable to withstand tilting moments. The rigidity and ability to withstand tilting moments of this configuration is not as good as the DB configuration form, where the bearings can withstand bi-directional axial loads.
Tandem configuration, the rear code for DT (such as 70000/DT), tandem configuration, the load line parallel, radial and axial load by the bearings evenly shared. However, the bearing set can only withstand axial loads acting in one direction. If the axial load acts in the opposite direction, or if there is a composite load, a third bearing adjusted relative to the tandem pair must be added. This configuration can also be used with three or more bearings in series at the same support, but can only withstand axial loads in a single direction. Usually, in order to balance and limit the axial displacement of the shaft, the other bearing needs to be installed at the other bearing that can withstand the other direction of axial load.
Bearing code:0
Load capacity (simple)
The following is for paired bearings only and the basic load ratings and fatigue limit loads given in the product tables apply to individual bearings only.
*Basic dynamic load ratings for standard bearings in any configuration and SKF Explorer bearings in back-to-back or face-to-face configurations.
C=1, 62xC individual bearings
*Basic dynamic load rating for SKF Explorer bearings in tandem configuration
C=2xC individual bearings
*Basic static load rating
Co=2xCo individual bearings
*Fatigue limit load
Pu=2xPu individual bearings
Type of structural deformation
Double-row angular contact ball bearings are characterised by their ability to withstand combined radial and axial loads simultaneously, limiting axial displacement of both sides of the shaft. Compared with the two-way thrust ball bearing, this kind of bearing limit speed is higher, the contact angle is 32 degrees, the rigidity is good, can withstand the tilting moment is big, widely used in the front wheel hub of the small car (some models also use the same size of double-row tapered roller bearings).
Double row angular contact ball bearing structure deformation has four kinds.
Type A: Standard design for bearings with an outside diameter of less than or equal to 90 mm. There is no ball-loading gap, so they can withstand equal bi-directional axial loads. The use of lightweight glass fibre reinforced nylon 66 cages results in a very low temperature rise of the bearing.
Type A: Standard design for bearings with an outside diameter greater than 90 mm. They have a ball-loading notch on one side and are equipped with z-steel stamped cages or solid brass cages.
Type E: Reinforced construction with a ball loading notch on one side, which allows for more balls to be loaded and therefore has a higher load carrying capacity.
Two sides with dust cover type and two sides with seal type, A type design and E type design double row angular contact ball bearings can be two sides with dust cover (non-contact) or seal (contact). The sealed bearings are filled with rust-proof lithium grease and operate at temperatures ranging from -30 to 110 degrees Celsius. No further lubrication is required during use and they are no longer heated before mounting.
Double-row angular contact ball bearings should be noted when mounting, although the bearing can withstand bidirectional axial load, but if one side of the loading ball notch, it should be careful not to let the main axial load through the notched side of the groove edge.
main application
Single-row angular contact ball bearings: machine tool spindles, high-frequency motors, combustion turbines, centrifugal separators, front wheels of small cars, differential pinion shafts, booster pumps, drilling platforms, food machinery, indexing heads, refilling machines, low-noise cooling towers, electromechanical equipment, coating equipment, machine tool groove plate, arc welding machines
Double-row angular contact ball bearings: oil pumps, Roots blowers, air compressors, all types of transmissions, fuel injection pumps, printing machinery, planetary reducer, extraction equipment, cycloidal reducer, food packaging machinery, welding machine, electric iron, square box, gravity spray gun, wire stripping machine, half shafts, inspection and analysis equipment, fine chemical machinery
Installation Tips
High-speed precision angular contact ball bearings are mainly used in high-speed rotating occasions with light load, which require high precision, high speed, low temperature rise, low vibration and certain service life of the bearings. Often used as a high-speed electric spindle support parts installed in pairs, is the key supporting parts of high-speed electric spindle of internal surface grinding machine.
Mounting form
Angular contact ball bearing fast easy excellent automation selection book can provide selection, angular contact ball bearing mounting form, there are back to back, face to face and tandem arrangement of three kinds. Back to back (two bearings of the wide end face relative) installation, bearing contact angle line along the direction of the rotary axis spread, can increase its radial and axial support angle rigidity, deformation resistance ability is the biggest; Face to face (two bearings of the narrow end face relative) installation, bearing contact angle line towards the direction of the rotary axis convergence, its support angle rigidity is small. As the inner ring of the bearing extends the outer ring, when the outer ring of the two bearings pressed together, the outer ring of the original clearance elimination, can increase the bearing preload; tandem arrangement (two bearings of the wide end face in one direction) installation, the bearing contact angle line is the same direction and parallel, can make the two bearings share the same direction of the working load. However, in order to ensure the axial stability of the mounting, two pairs of tandem arrangement of bearings must be mounted opposite to each other at both ends of the shaft.
Main technical indexes: 1.
1. Bearing precision index: more than GB/307.1-94 P4 level precision.
2. High speed performance index: dmN value 1.3~1.8x 106 /min
3. Service life (average): >1500 h
The service life of high-speed precision angular contact ball bearings has a great relationship with the installation, and should pay attention to the following matters
1. Bearing mounting should be carried out in dust-free and clean room, bearing should be carefully selected, bearing spacer ring should be ground, under the premise of keeping the inner and outer ring spacer rings equal height, the parallelism of spacer ring should be controlled below 1um.
2. the bearings should be cleaned before mounting, when cleaning the inner ring slope upwards, the hand induction is flexible, no sense of stagnation, after drying, put into the prescribed amount of grease, such as oil mist lubrication should be put into a small amount of oil mist oil.
3. Bearing installation should use special tools, uniform force, and is strictly prohibited to knock; 4.
4. Bearing storage should be clean and ventilated, no corrosive gases, relative humidity should not exceed 65%, and long-term storage should be rust-proof periodically.
Suffix Definition
B:Modified internal structure
MP:Machined Window Brass Cage
TVP: glass fibre reinforced nylon cage
UA:Universal Architecture design for pairs of mounted bearings, small axial clearance bearing set
UO:Universal design for pair-mounted bearings, zero axial clearance bearing set
DA:Double half inner ring (double row angular contact ball bearings)
TVH: glass fibre reinforced polyamide cage, steel ball guide
Maintenance method
1、When the bearings run to a certain period of time (or maintenance maintenance period), the bearings will be completely removed;.
2, with cleaning diesel oil or paraffin soaking cleaning bearings, such as technical conditions, it is best to open the sealing cover cleaning.
3、After cleaning, empty dry cleaning oil, appearance check for any damage.
4, with a 150mm or so, the diameter of the angular contact ball bearings equal to the inner diameter of the stick (preferably hollow tube), one end of the fixed a bearing.
5, with the hand quickly rotating bearings at the same time, the other end of the stick (wooden tube) on the top of the ear or audio amplifier microphone to listen to the bearing rotation noise.
6、Fix the bearings and then flick the stick horizontally to check whether the bearings are worn and loose.
7, serious loosening, excessive rotation noise, there are serious defects in the FAG bearing should be eliminated, to the same type instead;.
8, take a bucket will be appropriate amount of grease (high-quality yellow dry oil) with the fire melting (not overheating), will be tested bearing into the bucket soaked to no bubble overflow. Take out the bearings before the grease cools down, the amount of residual grease is small. Take out the angular contact ball bearings after the grease cools down, the amount of residual grease is more. Determine the amount of residual grease according to the need.
9, with a soft cloth or toilet paper to wipe the bearing outside of the grease will be FAG bearings An original assembly to the pulley, maintenance work is over.
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