There are raceways on the inner and outer rings of angular contact ball bearings, and the inner and outer rings can make relative displacement along the bearing axis. This kind of bearing is especially suitable for bearing compound load, that is, radial and axial load acting at the same time. The axial load bearing capacity of angular contact ball bearing varies with the contact angle α It increases with the increase of temperature. The contact angle is the angle between the line of contact point between ball and raceway in radial plane and the vertical line of bearing axis.
The models of angular contact ball bearings are divided into: α= fifteen ° The angular contact ball bearing (70000C type) is adopted; α= twenty-five ° The angular contact ball bearing (70000ac type) is adopted; α= forty ° The angular contact ball bearing (70000b type) is adopted; Back to back double angular contact ball bearing [70000C (AC, b) / DB type]; Face to face double angular contact ball bearing [70000C (AC, b) / DF type]; Tandem double angular contact ball bearing [70000C (AC, b) / dt type]; Double row angular contact ball bearing with ball notch (00000 type); Double row angular contact ball bearing without ball gap (00000a type); Double row angular contact ball bearing (00000a-z type) without ball gap and with dust cover on one side; Double row angular contact ball bearing (00000a-2z type) without ball gap and with dust cover on both sides; Double row angular contact ball bearing (00000 ARS type) without ball gap and with sealing ring on one side; Double row angular contact ball bearing (00000a-2rs type) with sealing rings on both sides without ball gap; There are 13 kinds of four point angular contact ball bearings (qj0000 type).
Single row angular contact ball bearings can only bear axial load in one direction, which will cause additional axial force when bearing radial load. And it can only limit the axial displacement of shaft or shell in one direction. The contact angle of angular contact ball bearing is 40 degrees, so it can bear large axial load. The angular contact ball bearing is a non separating design. The shoulders on both sides of the inner and outer rings are different. In order to improve the load capacity of the bearing, the shoulder of one side will be machined lower, so that more steel balls can be loaded into the bearing.
The double row angular contact ball bearing can bear larger radial load, mainly radial and axial combined load and torque load, and limit the axial displacement of the shaft. Among the components mainly used to limit the bidirectional axial displacement of shaft and shell, the tilting ability between the inner ring and outer ring of double row angular contact ball bearing is limited. The allowable tilting angle depends on the internal clearance, bearing size, internal design and the force and torque acting on the bearing, and the maximum allowable tilting angle should ensure that there is no excessive additional stress 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 the running accuracy of the bearing will be reduced, and the running noise will be increased. Nylon cage or brass solid cage is generally used for double row angular contact ball bearings. When installing double row angular contact ball bearing, it should be noted that although the bearing can bear two-way axial load, if there is a ball loading gap on one side, the main axial load should not pass through the groove side with the gap. When the bearing is used, attention should be paid to make the raceway on the side without ball loading gap bear the main load.
If it is installed in pairs, make the outer rings of a pair of bearings opposite, that is, the wide end face to the wide end face, and the narrow end face to the narrow end face. In this way, the additional axial force can be avoided, and the shaft or shell can be limited in the range of axial clearance in two directions.
Because the raceway of its inner and outer rings can have relative displacement on the horizontal axis, it can bear both radial load and axial load - combined load (single row angular contact ball bearings can only bear single direction axial load, so they are usually installed in pairs).
Cage materials are brass, synthetic resin, etc., according to the bearing form, use conditions and distinction.
Most of the angular contact ball bearings are manufactured by foreign bearing manufacturers, and most of them are used in imported equipment in China, 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, which means back-to-back contact.
1. Bearings for general assembly
Universal matched bearings are specially processed. When the bearings are installed close to each other, any combination method can achieve the given internal clearance or preload, as well as the average load distribution, without the use of gaskets or similar devices.
Paired bearings are used when the load bearing capacity of a single bearing is insufficient (using the channeling configuration) or when bearing combined load or axial load acting in two directions (using the back-to-back or face-to-face configuration).
2. Bearings of basic design (cannot be used as general assembly) are used for the configuration of single bearing
The basic design of single row angular contact ball bearings is mainly used in the configuration of only one bearing in each position. Its width and protrusion are common tolerance. Therefore, it is not suitable to install two single row angular contact ball bearings close to each other.
The accuracy class of angular contact ball bearings includes dimensional tolerance and rotational accuracy. The accuracy 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 the accuracy level. P3 is equivalent to P6 of ISO and JIS standards, P7 is equivalent to P4, and P9 is equivalent to P2.
Angular contact ball bearings are: 7000c type (∝ =15) °)、 70000ac type (∝ =25) °) And 7000b (∝ =40 °) Several types. The lock port of the bearing is on the outer ring, and the inner and outer rings can not be separated, and can bear the combined radial and axial loads and axial load in one direction. The ability to bear axial load is determined by contact angle, and the larger the contact angle, the higher the capacity to bear axial load. The bearing can limit the axial displacement of the shaft or shell in one direction.
The ultimate speed of contact ball bearing is high, which can bear both radial load and axial load, but also can bear pure axial load. Its axial load capacity is determined by contact angle and increases with the increase of contact angle.
Single row angular contact ball bearing
Single row angular contact ball bearing can only bear axial load in one direction. When bearing radial load, additional axial force will be caused, and corresponding reverse load must be applied. Therefore, this kind of bearing is generally used in pairs. The double row angular contact ball bearing can bear the large radial and axial combined load and torque load mainly with radial load. It can limit the axial displacement of the shaft or shell in two directions, and the contact angle is 30 degrees.
The characteristic of double row angular contact ball bearing is that it can bear the combined load of radial and axial load at the same time and limit the axial displacement of the shaft. Compared with the two-way thrust ball bearing, this kind of bearing has higher limit speed, 32 degree contact angle, good rigidity, and can withstand large overturning moment. It is widely used in the front wheel hub of cars (some models also use double row tapered roller bearings of the same size).
There are four structural deformations of double row angular contact ball bearings
Type A: Standard Design of bearing with outer diameter less than or equal to 90mm. There is no ball loading gap, so it can bear the same two-way axial load. The cage is made of light glass fiber reinforced nylon 66. The temperature rise of the bearing is very small.
Type A: Standard Design of bearing with outer diameter greater than 90mm. There is a ball loading gap on one side, equipped with Z steel plate stamping cage or brass solid cage.
Type E: it is a reinforced structure with a ball loading gap on one side, which can hold more steel balls, so it has higher bearing capacity.
Double row angular contact ball bearings of type A and type E can be equipped with dust cover (non-contact) or sealing ring (contact) on both sides. Sealed bearings are filled with anti rust lithium grease, the operating temperature is generally between - 30 ℃ and 110 ℃. There is no need to re lubricate during use and no heating before installation.
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 cooling tower, electromechanical equipment, coating equipment, machine bed slot plate, arc welding machine
Double row angular contact ball bearings: oil pump, roots blower, air compressor, various transmissions, fuel injection pump, printing machinery, planetary reducer, extraction equipment, cycloid reducer, food packaging machinery, electric welding machine, electric soldering iron, square box, gravity spray gun, wire stripper, half shaft, inspection and analysis equipment, fine chemical machinery