Types and maintenance methods of angular contact ball bearings

Angular contact ball bearings are: 7000C type (∝=15°), 7000AC type (∝=25°) and 7000B (∝=40°) several types. The lock of this kind of bearing is on the outer ring, generally the inner and outer rings cannot be separated, and can bear the combined radial and axial loads and the axial load in one direction. The ability to bear axial load is determined by the contact angle. The larger the contact angle, the higher the ability to bear axial load. This type of bearing can limit the axial displacement of the shaft or housing in one direction. The contact ball bearing has a high limit speed, and can bear radial load and axial load at the same time, and can also bear pure axial load. Its axial load capacity is determined by the contact angle and increases with the increase of the contact angle. Single row angular contact ball bearings Single row angular contact ball bearings can only bear axial load in one direction. When bearing radial load, it will cause additional axial force, which must be applied to the corresponding reverse load. Therefore, this kind of bearing is generally Use in pairs. Double row angular contact ball bearings can withstand larger radial and axial bidirectional combined loads and moment loads, which are mainly radial loads. It can limit the bidirectional axial displacement of the shaft or housing, and the contact angle is 30 degrees. Bearing code: 7 Paired installation angular contact ball bearings Paired installation angular contact ball bearings can withstand radial and axial bidirectional combined loads mainly based on radial loads, and can also withstand pure radial loads.

The tandem 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 and submitted to the user. After installation, there is preload interference, and the ring and steel ball are in an axial preload state, thus improving the rigidity and rotation of the entire set of bearings as a single support. precision. Back-to-back configuration, the rear code is DB (eg 70000/DB), the load lines of the bearings paired back-to-back are separated to the bearing shaft. Axial loads acting in both directions can be supported, but loads in each direction can only be supported by one bearing. Back-to-back mounted bearings provide a relatively rigid bearing arrangement and can withstand overturning moments.

In the face-to-face configuration, the rear code is DF (such as 70000/DF), and the load lines of the face-to-face paired bearings converge to the bearing shaft. Axial loads acting in both directions can be supported, but loads in each direction can only be supported by one bearing. This configuration is not as rigid as a back-to-back pair, and it is less suited to withstand overturning moments. The rigidity of this configuration and the ability to bear the overturning moment are not as good as those of the DB configuration, and the bearing can bear bidirectional axial loads; in the series configuration, the rear code is DT (such as 70000/DT), in the series configuration, the load line is parallel, and the radial and The axial load is evenly shared by the bearings. However, bearing sets can only withstand axial loads acting in one direction.

If the axial load is acting in the opposite direction, or if there is a compound load, a third bearing that is adjusted relative to the tandem paired bearing must be added. This configuration also allows three or more bearings to be connected in series at the same support, but can only bear axial loads in one direction. Usually, in order to balance and limit the axial displacement of the shaft, a bearing that can bear the axial load in the other direction needs to be installed at the other support. Bearing code: 0 Load capacity (simplified) The following content is only for the load capacity of the matched 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 arrangement and SKF Explorer bearings C=1, 62xC single bearing in back-to-back or face-to-face arrangement *Basic dynamic load rating for SKF Explorer bearings C=2xC single bearing in tandem arrangement *Basic static load rating Co=2xCo single bearing *Fatigue limit load Pu=2xPu single bearing structure deformation type 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, limiting the two aspects of the shaft Axial displacement.

Compared with the two-way thrust ball bearing, this bearing has a higher limit speed, a contact angle of 32 degrees, good rigidity, and can withstand a large overturning moment. It is widely used in the front wheel hub of cars (some models also use the same size. Double row tapered roller bearings). There are four structural deformations of double row angular contact ball bearings: Type A: Standard design of bearings with an outer diameter less than or equal to 90mm. There is no ball gap, so it can withstand equal bidirectional axial loads. Using light glass fiber reinforced nylon 66 cage, bearing temperature rise is small. Type A: Standard design for bearings with an outer diameter greater than 90mm.

There is a ball-loading notch on one side, and it is equipped with a z-steel stamping cage or a solid brass cage. Type E: It is a reinforced structure with a ball-loading notch on one side, which can hold more steel balls, so the bearing capacity is higher. Double row angular contact ball bearings with double-row angular contact ball bearings of type A and E design can be equipped with shields (non-contact type) or sealing rings (contact type) on both sides. The interior of the sealed bearing is filled with anti-rust lithium-based grease, and the operating temperature is generally between -30 degrees and 110 degrees. No relubrication is required during use and no heating is required before installation. 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.

Angular contact ball bearing maintenance method 1. When the bearing runs for a certain period of time (or maintenance period), remove all the bearings; 2. Use diesel or kerosene for cleaning to soak and clean the bearing. If there are technical conditions, it is best to open the seal Cover cleaning; 3. Air-dry and clean the oil after cleaning, and inspect the appearance for damage; 4. Use a wooden rod (preferably a hollow tube) with a diameter of about 150mm and the same diameter as the inner diameter of an 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 rotating noise of the bearing; 6. After fixing the bearing, move the wooden stick horizontally to check whether the bearing is worn or 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 an appropriate amount of grease (high-quality yellow dry oil) with a slow fire (not overheated), and put the The tested bearings are soaked in a bucket until no bubbles overflow. Take out the bearing before the grease is cooled, and the amount of residual grease is small. After the grease has cooled, the angular contact ball bearing is taken out, and there is a large amount of residual grease. Determine the amount of grease remaining as needed. 9. Wipe the grease on the outside of the bearing with a soft cloth or toilet paper. Assemble the FAG bearing to the pulley in its original state, and the maintenance work is over.