Shandong Jinju International Trading Co. LTD

Angular contact ball bearing 1 Introduction The inner and outer rings of angular contact ball bearings are provided with raceways, and the inner and outer rings can be shifted along the axial direction of the bearing. This type of bearing is especially suitable for bearing composite loads, that is, radial and axial loads acting simultaneously. The axial load bearing capacity of angular contact ball bearing increases with the increase of contact Angle α. The contact Angle is the Angle between the contact point connection of the ball and raceway and the vertical line of the bearing axis in the radial plane. The models of angular contact ball bearings are divided into: α=15° angular contact ball bearings (70000C type); α=25° angular contact ball bearings (70000AC type); α=40° angular contact ball bearing (type 70000B); Back-to-back pairs of double angular contact ball bearings [70000C(AC, B)/DB type]; Face to face paired double angular contact ball bearings [70000C(AC, B)/DF type]; Series paired double angular contact ball bearings [70000C (AC, B)/DT type]; Double row angular contact ball bearings with ball filling notches (type 00000); Double row angular contact ball bearing (Type 00000A) without ball filling gap; Double row angular contact ball bearing (type 00000A-Z) with dust-proof cover without ball filling gap; Double-row angular contact ball bearings (type 00000A-2Z) with dust-proof covers on both sides without ball filling notches; Double row angular contact ball bearing (type 00000ARS) with sealing ring on one side without ball filling gap; Double-row angular contact ball bearings (type 00000A-2RS) with sealing rings on both sides without ball filling notches; Four point angular contact ball bearings (QJ0000 type), 13 kinds. 2 Concepts Angular contact ball bearing Single-row angular contact ball bearings can only bear axial load in one direction, and additional axial force will be caused when bearing radial load. And only limit the axial displacement of the shaft or housing in one direction. Angular contact ball bearings have a contact Angle of 40 degrees, so they can withstand large axial loads. Angular contact ball bearings are of a non-separation design, and the shoulders on both sides of the inner and outer rings are not high or low. In order to increase the load capacity of the bearing, the shoulder on one side is machined lower, so that the bearing can fit more steel balls. Double row angular contact ball bearings can bear large radial loads, mainly radial and axial combined loads and torque loads, limiting the axial displacement of both sides of the shaft. The inclinability between the inner and outer rings of the double-row angular contact ball bearing is limited in the parts mainly used to limit the two-way axial displacement of the shaft and the housing. The allowable inclination Angle depends on the internal clearance of the bearing, the bearing size, the internal design and the force and moment acting on the bearing, and the maximum allowable inclination Angle should ensure that no excessive additional stress is generated in the bearing. If the inclination Angle between the inner and outer rings of the bearing exists, the life of the bearing will be affected, and the running accuracy of the bearing will be reduced, and the running noise will be increased. Double row angular contact ball bearings generally use nylon cages or brass solid cages. When installing double row angular contact ball bearings, attention should be paid to the fact that although the bearings can withstand two-way axial loads, if there is a ball loading gap on one side, care should be taken not to let the main axial load pass through the groove side with a gap. When the bearing is used, attention should be paid to making the raceway without the ball filling gap bear the main load. Paired double ball bearings If it is installed in pairs, the outer rings of a pair of bearings are relative, that is, the wide end faces the wide end face and the narrow end faces the narrow end face. This avoids causing additional axial forces and allows the shaft or housing to be confined to axial clearance in both directions. Because the raceway of its inner and outer rings can have relative displacement on the horizontal axis, it can bear radial load and axial load at the same time - combined load (single row angular contact ball bearings can only bear single direction axial load, so they are generally installed in pairs). The material of the cage is brass, synthetic resin, etc., according to the bearing form and use conditions. Angular contact ball bearings are mostly manufactured by foreign bearing manufacturers, and more domestic applications are used in imported equipment, such as angular contact ball bearings 3204RS, etc. Narrow side on the outside, wide side on the inside, another wide side on the inside, narrow side on the outside, that's back-to-back contact. peculiarity 1, general assembly bearing General assembly bearings are specially machined so that when bearings are mounted close to each other, any combination can achieve a given internal clearance or pretension, as well as an average load distribution, without the use of gaskets or similar devices. Paired bearings are used when the load carrying capacity of a single bearing is insufficient (using a cross-over configuration) or when a combined load or axial load acting in two directions is required (using a back-to-back or face to face configuration). 2, the basic design of the bearing (can not be used as a general assembly), for the configuration of a single bearing The basic design of single-row angular contact ball bearings is mainly used in configurations with only one bearing at each position. Its width and protrusion are common grade tolerances. Therefore, it is not suitable to install two single-row angular contact ball bearings close together. 3 Precision level editing Angular contact ball bearing accuracy class includes dimensional tolerance and rotation accuracy. Precision from low to high is expressed as P0(common), P6(P6X), P5, P4, P2. In addition, P3, P7, and P9 are also used in European and American brands to indicate accuracy levels, P3 is equivalent to P6 of ISO and JIS standards, P7 is equivalent to P4, and P9 is equivalent to P2. 4 Types There are several types of angular contact ball bearings: 7000C (∝=15°), 7000AC (∝=25°) and 7000B(∝=40°). The lock of the bearing is on the outer ring, generally the inner and outer rings can not be separated, and can withstand the combined radial and axial load as well as the axial load in one direction. The ability to bear axial loads is determined by the contact Angle, and the larger the contact Angle, the higher the ability to bear axial loads. The bearing can limit the axial displacement of the shaft or housing in one direction. The limit speed of contact ball bearing is high, which can bear radial load and axial load at the same time, and can also bear pure axial load, and its axial load capacity is determined by the contact Angle, and increases with the increase of the contact Angle. Single row angular contact ball bearing Single row angular contact ball bearings can only withstand one direction of the axial load, in the radial load, will cause additional axial force, must apply the corresponding reverse load, therefore, this kind of bearings are generally used in pairs. Double row angular contact ball bearings can bear large radial and axial bidirectional combined loads and torque loads, which are mainly radial loads. It can limit the axial displacement of the shaft or housing, and the contact Angle is 30 degrees. Bearing code: 7 Mount angular contact ball bearings in pairs Paired angular contact ball bearings can bear both radial and axial combined loads, which are mainly radial loads, and can also bear pure radial loads. The series configuration 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 and combined by the manufacturer to submit to the user in pairs, after installation, prepressure interference, the ring and the steel ball are in the axial preload state, thus improving the stiffness and rotation accuracy of the whole set of bearings as a single support. Back-to-back configuration, with the rear designation DB (e.g. 70000/DB), the load lines of the back-to-back paired bearings are separated from the bearing shaft. It can withstand axial loads acting in two directions, but the load in each direction can only be borne by one bearing. Back-to-back mounted bearings provide a bearing configuration with relatively high rigidity and can withstand overturning moments. In a face to face configuration, with the rear designation DF (e.g. 70000/DF), the load lines of the bearings paired face to face meet towards the bearing shaft. It can withstand axial loads acting in two directions, but the load in each direction can only be borne by one bearing. This configuration is not as rigid as back-to-back pairing and is less suitable for withstanding overturning moments. The rigidity and ability to withstand overturning moment of this configuration is not as good as that of DB configuration, and the bearing can withstand two-way axial load; In series configuration, the rear code is DT (such as 70000/DT), in series configuration, the load line is parallel, and the radial and axial load is evenly shared by the bearing. However, the bearing group can only withstand the axial load acting in one direction. If the axial load acts in the opposite direction, or if there is a compound load, a third bearing that is adjusted relative to the tandem pair bearing must be added. This configuration can also have three or more bearings in series at the same support, but can only withstand axial loads in one direction. Usually, in order to balance and limit the axial displacement of the shaft, a bearing that can withstand the axial load in the other direction must be installed at the other support. Bearing code: 0 Load capacity simple The following information is only for the load capacity of the paired bearing, and the basic load rating and fatigue limit load given in the product table are only applicable to a single bearing. * Basic dynamic load rating for standard bearings in any configuration and SKF Explorer bearings in back-to-back or face to face configurations C= 1,62 xC single bearing * Basic dynamic load rating for SKF Explorer bearings in series configuration C=2xC single bearing * Basic static load rating Co=2xCo Single bearing * Fatigue limit load Pu=2xPu single bearing Type of structural deformation Double row angular contact ball bearings can bear the combined load of radial and axial loads at the same time, limiting the axial displacement of both sides of the shaft. Compared with two-way thrust ball bearings, this bearing has a higher limit speed, a contact Angle of 32 degrees, good rigidity, and can withstand large overturning moment, and is widely used in the front wheel hub of the car (some models also use double-row tapered roller bearings of the same size). There are four kinds of structural deformation of double row angular contact ball bearings: Type A: Standard design of bearings with an outer diameter of 90mm or less. There is no ball filling gap, so it can withstand equal two-way axial loads. Light glass fiber reinforced nylon 66 cage, bearing temperature rise is very small. Type A: Standard design for bearings with an outer diameter greater than 90mm. One side has a ball notch and is equipped with a Z-plate pressed cage or a brass solid cage. Type E: It is a reinforced structure with a ball filling gap on one side, which can install more steel balls, so the carrying capacity is higher. Double row angular contact ball bearings with two sides of dust cap type and two sides of seal type, type A design and type E design can have two sides of dust cap (non-contact) or seal (contact). The inside of the sealed bearing is filled with anti-rust lithium grease, and the operating temperature is generally between -30 degrees and 110 degrees. No more lubrication is required during use, and no more heating before installation. When installing double row angular contact ball bearings, attention should be paid to the fact that although the bearings can withstand two-way axial loads, if there is a ball loading gap on one side, care should be taken not to let the main axial load pass through the groove on the side with a gap. 5 Main Uses Single row angular contact ball bearings: machine tool spindle, high frequency motor, gas turbine, centrifugal separator, small car front wheel, differential pinion shaft, booster pump, drilling platform, food machinery, dividing head, repair welding machine, low noise type cooling tower, electromechanical equipment, painting equipment, machine slot plate, arc welding machine Double row angular contact ball bearings: oil pump, Roots blower, air compressor, various transmission, fuel injection pump, printing machinery, planetary reducer, extraction equipment, cycloidal reducer, food packaging machinery, electric welding machine, electric soldering iron, square box, gravity spray gun, wire stripping machine, half shaft, inspection and analysis equipment, fine chemical machinery 6 Edit installation tips High-speed precision angular contact ball bearings are mainly used for high-speed rotating occasions with light load, requiring high accuracy, high speed, low temperature rise and low vibration of the bearing and a certain service life. The supporting parts of high-speed motorized spindle are often installed in pairs and are the key accessories of high-speed motorized spindle of internal surface grinding machine. Installation form Angular contact ball bearings can provide selection, angular contact ball bearings installation form, back-to-back, face to face and series arrangement of three. When the two bearings are installed back-to-back (the wide end faces of the two bearings are opposite), the contact Angle line of the bearing spreads along the direction of the rotation axis, which can increase the radial and axial support Angle rigidity and maximize the deformation resistance. When installed face to face (the narrow ends of the two bearings are opposite), the contact Angle line of the bearing converges in the direction of the rotation axis, and the rigidity of the supporting Angle is small. Because the inner ring of the bearing extends out of the outer ring, when the outer rings of the two bearings are pressed together, the original clearance of the outer ring is eliminated, and the preload of the bearing can be increased. When the series arrangement (the wide end faces of the two bearings are in one direction) is installed, the contact Angle line of the bearing is in the same direction and parallel, so that the two bearings can share the working load in the same direction. However, when using this installation form, in order to ensure the axial stability of the installation, the two pairs of bearings arranged in series must be installed at both ends of the shaft. Main technical indicators: 1. Bearing accuracy index: more than GB/307.1-94 P4 level accuracy 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 the following matters should be paid attention to 1. Bearing installation should be carried out in a dust-free and clean room, bearings should be carefully selected, bearing spacers should be ground, under the premise of maintaining the height of the inner and outer spacers, the parallelism of the spacers should be controlled below 1um; 2. The bearing should be cleaned before installation, the inner ring slope is upward when cleaning, the hand sensor is flexible, no sense of stagnation, after drying, put specified amount of grease, such as oil mist lubrication should be put into a small amount of oil mist; 3. Special tools should be used for bearing installation, with uniform force and no beating. 4. Bearing storage should be clean and ventilated, no corrosive gas, relative humidity does not exceed 65%, long-term storage should be regular rust prevention. 7 Suffix definition edit B: Modified internal structure MP: Machined window brass cage TVP: glass fiber reinforced nylon cage UA: General structural design for mounting bearings in pairs, small axial clearance bearing groups UO: Universal structural design for paired mounting bearings, zero axial clearance bearing sets DA: Double half inner ring (double row angular contact ball bearing) TVH: Glass fiber reinforced polyamide cage, steel ball guide 8 Maintenance methods edit 1, when the bearing runs to a certain period (or maintenance period), all the bearings are removed; 2. Soak the bearing with diesel or kerosene for cleaning. If there are technical conditions, it is best to open the seal cover for cleaning; 3, air dry cleaning oil after cleaning, appearance check for damage; 4, with a 150mm diameter angular contact ball bearing inner diameter equal to the stick (preferably hollow tube), one end fixed a bearing; 5, with the hand to quickly turn the bearing at the same time, the other end of the stick (wood tube) on the ear or audio amplifier microphone to listen to the bearing rotation noise; 6, after fixing the bearing, move the wood rod horizontally to check whether the bearing is worn and loose; 7. FAG bearings with serious loosening, excessive rotation noise and serious defects should be eliminated and replaced with the same model; 8. Take a bucket and melt the appropriate amount of grease (high quality yellow dry oil) with gentle heat (can not be overheated), and soak the tested bearing in the bucket until no bubbles overflow. Remove the bearing before the grease cools, and the amount of residual grease is small. Remove the angular contact ball bearing after the grease is cooled, and there is a large amount of residual grease. Determine the amount of residual grease as needed. 9. Wipe the grease on the outside of the bearing with a soft cloth or toilet paper and assemble the FAG bearing on the pulley in its original state, and the maintenance work will be finished.

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