Angular contact ball bearing characteristics, classification, and use
Angular contact ball bearing design:
Single row angular contact ball bearings can only bear the axial load in one direction, and will cause additional axial force when bearing radial load. And can 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 non-separable design, with shoulders at different heights on both sides of the inner and outer rings. To increase the bearing’s load capacity, one of the shoulders is machined lower, allowing the bearing to fit more balls.
Double row angular contact ball bearings can withstand larger radial loads and combined radial and axial loads and moment loads, limiting the axial displacement of the shaft on both sides. The inclination between the inner and outer rings of the double row angular contact ball bearing is limited in the components that are mainly used to limit the bidirectional axial displacement of the shaft and the housing. forces and moments on the bearing, and the maximum allowable inclination angle should ensure that excessive additional stress is not generated in the bearing.
If there is an inclination angle between the inner and outer rings of the bearing, the service life of the bearing will be affected, and at the same time, the running accuracy of the bearing will decrease and the running noise will increase. Double row angular contact ball bearings generally use nylon cages or brass solid cages.
When installing the double row angular contact ball bearing, it should be noted that although the bearing can bear bidirectional axial load, if there is a gap for the ball on one side, care should be taken not to let the main axial load pass through the groove on the side with the gap. When the bearing is used, care should be taken to make the side raceway without the ball-loading notch bear the main load.
Paired double ball bearings
If it is installed in pairs, make the outer rings of a pair of bearings face each other, that is, the wide end faces the wide end face, and the narrow end faces the narrow end face. In this way, additional axial forces are avoided and the shaft or housing is limited to the axial play in both directions.
Because the raceways of the inner and outer rings can have relative displacement on the horizontal axis, they can bear radial load and axial load at the same time – combined load (single row angular contact ball bearings can only bear axial load in one direction, so generally installed in pairs).
The material of the cage is brass, synthetic resin, etc., which are distinguished according to the bearing type and usage conditions.
Angular contact ball bearings are mostly manufactured by foreign bearing manufacturers, and more domestically used in imported equipment such as angular contact ball bearings 3204RS, etc.
The narrow side is outside, the wide side is inside, the other wide side is inside, and the narrow side is outside, that is, back-to-back contact.
Angular contact ball bearing features:
1. Universally matched bearings
Universally matchable bearings are specially machined. When the bearings are mounted close to each other, any combination can achieve a given internal clearance or preload, as well as an even load distribution, without the use of spacers or similar devices.
Paired bearings are used when the load-carrying capacity of a single bearing is insufficient (using a tandem arrangement) or when combined loads or axial loads acting in both directions (using a back-to-back or face-to-face arrangement).
2. The basic design of the bearing (can not be used as a general matching group), used for the configuration of a single bearing
Basic design single row angular contact ball bearings are mainly used in arrangements with only one bearing per position. Its width and protrusion are general tolerances. Therefore, it is not suitable to install two single row angular contact ball bearings closely.
Angular contact ball bearing accuracy class:
Angular contact ball bearing accuracy classes include dimensional tolerances and rotational accuracy. The precision is expressed as P0 (normal), P6 (P6X), P5, P4, P2 from low to high. In addition, European and American brands also use P3, P7, and P9 to indicate the accuracy level. P3 is equivalent to P6 level of ISO and JIS standards, P7 is equivalent to P4 level, and P9 is equivalent to P2 level.
Angular contact ball bearing specific classification and model comparison table:
1. Angular contact ball bearing with a=15°(70000C type)
2. Angular contact ball bearing with a=25°(70000AC type)
3. Angular contact ball bearing with a=40°(70000B type)
4. High-speed sealed angular contact ball bearing with a=15°(B70000C-2RZ type)
5. High-speed sealed angular contact ball bearing with a=25°(B70000AC-2RZ type)
6. High-speed sealed angular contact ceramic ball bearing with a=15°(B70000C-2RZ/HQ1 type)
7. High-speed sealed angular contact ceramic ball bearing with a=25°(B70000AC-2RZ/HQ1 type)
8. Back-to-back paired double angular contact ball bearings [70000C (AC, B)/DB type]
9. Face-to-face paired double angular contact ball bearings [70000C (AC, B)/DF type]
10. Tandem paired double angular contact ball bearings [70000C (AC, B)/DT type]
11. Double row angular contact ball bearing with ball gap (0000 type a=30°)
12. Double row angular contact ball bearing without ball gap (0000A type a=30°)
13. Double row angular contact ball bearing with dust cover on one side (0000A-Z type a=30°)
14. Double row angular contact ball bearing with dust cover on both sides (0000A-2Z type a=30°)
15. Double row angular contact ball bearing with sealing ring on one side (0000A-RZ type a=30°)
16. Double row angular contact ball bearing with sealing rings on both sides (0000A-2RZ type a=30°)
17. Four-point contact ball bearing (QJ type a=35°)
Main uses of angular contact ball bearings
Single row angular contact ball bearings: machine tool spindles, high frequency motors, gas turbines, centrifugal separators, front wheels of small cars, differential pinion shafts, booster pumps, drilling platforms, food machinery, indexing heads, repair welding machines, Low-noise cooling towers, electromechanical equipment, painting equipment, machine tool slots, arc welding machines
Double row angular contact ball bearings: oil pumps, roots blowers, air compressors, various transmissions, fuel injection pumps, printing machinery, planetary reducers, extraction equipment, cycloid reducers, food packaging machinery, electric welding machines, electric soldering irons, Square box, gravity spray gun, wire stripping machine, half shaft, inspection and analysis equipment, fine chemical machinery
Angular contact ball bearing suffix definition
B: Modified internal structure
MP: Machined Window Brass Cage
TVP: glass fiber reinforced nylon cage
UA: Universal structural design for pair-mounted bearings, small axial clearance bearing set
UO: Universal structural design for pair mounted bearings, zero axial clearance bearing set
DA: Double half inner ring (double row angular contact ball bearing)
TVH: Glass-fibre-reinforced polyamide cage, ball-guided
Misunderstandings in judging the quality of angular contact ball bearings:
1. First of all, most people generally think that the quality of the bearing can be proved through the surface of the bearing. The editor can tell you responsibly that this statement is wrong.
Usually in the process of selling bearings, we often find that many customers say that as long as the surface of the angular contact ball bearing is bright, it means that it is of good quality, and we will usually tell customers that this idea is wrong. But many times it backfires. Then it needs to be emphasized that the surface of imported angular contact ball bearings should be a kind of black gloss, not the kind of oily gloss. However, the reason for this black gloss is whether the steel used in the bearing meets the standard and its grinding process and use. produced by cutting fluid, etc.
- Many people also judge whether the quality of the angular contact bearing is good or bad by checking whether the chamfer of the angular contact bearing is bright, but the reality is that the chamfer of the angular contact ball bearing does not determine the quality of the bearing, but it reflects the angular contact. Processing method of 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.
Angular contact ball bearing installation method
1. The angular contact ball bearing should be cleaned with gasoline or kerosene before the bearing is installed, and then dried and lubricated. The lubrication of the bearing is generally grease lubrication, of course, oil lubrication can also be used. When using grease lubrication, the grease with excellent properties such as no impurities, anti-oxidation, anti-rust and extreme pressure should be used. The filling amount of grease should be 30%-60% of the bearing and bearing housing volume, and should not be too much. The bearing with sealed structure and the water pump shaft connecting bearing have been filled with grease, which can be used directly by the user and cannot be cleaned again.
When installing angular contact ball bearings (not only angular contact ball bearings, but also other bearings), equal pressure must be applied to the circumference of the end face of the ferrule to press the ferrule in. Never use a hammer or smashing tools. Directly strike the end face of the angular contact ball bearing to avoid damage to the bearing.
2. When the interference is small, press the end face of the bearing ring with a sleeve at room temperature, hit the sleeve with a hammer, and press the ferrule evenly through the sleeve. If installed in large quantities, hydraulic presses can be used. When pressing in, it should be ensured that the end face of the outer ring and the end face of the shoulder of the shell, and the end face of the inner ring and the end face of the shaft shoulder are pressed tightly, and no gap is allowed.
3. When the amount of interference is large, oil bath heating or inductor heating angular contact ball bearings can be used for installation. The heating temperature range is 80°C-100°C, and cannot exceed 120°C. At the same time, tighten the bearing with nuts or other suitable methods to prevent the bearing from shrinking in the width direction after cooling and causing a gap between the ring and the shaft shoulder.
4. After the angular contact ball bearing is installed, the clearance should be adjusted. The clearance value should be determined according to different operating conditions and the size of the interference. When necessary, tests should be carried out to determine.
Features of Angular Contact Ball Bearings
1. High-quality steel: Ultra-clean steel bearings extend the life of up to 80%.
2. Lubrication technology: Seiko lubricating grease can prolong life and performance.
3. High-grade ball: quiet and smooth operation, even in the case of high-speed growth, it can keep running smoothly.
4. Super finished raceway: specially honed to reduce the occurrence of noise and improve lubricating oil distribution and life.
5. Contact angle: 15, 25, 30 and 40 degrees.
6. Patented seal provides resistance to contamination in harsh environments.
7. Cage: available in nylon, steel, copper cage assembly range.
8. Quality Assurance: 100% testing to ensure the quality of the entire product.
Maintenance steps for angular contact ball bearings
1. When the bearing runs for a certain period (or maintenance period), it is necessary to remove all the bearings for maintenance and maintenance;
2. Diesel oil or kerosene should be used to soak and clean the bearing during cleaning, and the sealing cover should be opened for cleaning if possible;
3. After cleaning, it is necessary to ensure that the cleaning oil does not exist and check whether the appearance is damaged;
4. Use a wooden stick (preferably a hollow tube) with a diameter of about 150mm and the same diameter as the inner diameter of the angular contact ball bearing, and fix a bearing at one end;
5. While quickly turning the bearing by hand, put the other end of the wooden stick (wooden pipe) on the ear or the audio amplifier microphone to hear the bearing rotation noise;
6. After fixing the bearing, move the wooden stick horizontally to check whether the bearing is worn or loose;
7. Angular contact ball bearings with serious loosening, excessive rotation noise and serious defects should be eliminated in time and replaced with the same model, and flukes cannot be retained;
8. Take a bucket and melt an appropriate amount of grease (high-quality yellow dry oil) with slow fire (do not overheat), put the tested bearing in the bucket and soak it until no bubbles overflow, and take out the angular contact ball bearing after the grease is cooled.
9. Wipe the grease on the outside of the bearing with a soft cloth or toilet paper. Assemble the angular contact ball bearing to the pulley in its original state, and the maintenance work is over.
