January 16, 2020
The self-aligning ball bearing has two structures of cylindrical hole and conical hole, and the material of cage includes steel plate, synthetic resin, etc. Its characteristic is that the raceway of the outer ring is spherical and has the property of automatic centering, which can compensate the errors caused by different centering and shaft deflection, but the relative inclination of the inner and outer rings shall not exceed 3 degrees.
Self aligning ball bearings micro series 10x, 12x, 13X universal series 12xx, 13xx, 22xx, 23xx similar products Sweden SKF self aligning ball bearings precision shaft structure cylindrical hole and conical hole
Self-aligning ball bearings are bearings equipped with spherical balls between the inner ring of two raceways and the outer ring of which the raceways are spherical.
The center of curvature of the outer ring raceway surface is consistent with the bearing center, so it has the same self-aligning function as the self-aligning ball bearing. When the shaft and housing are deflected, it can be adjusted automatically without increasing the bearing load. Spherical roller bearings can support radial loads and axial loads in two directions. Large radial load capacity, suitable for heavy load and impact load. The inner diameter of the inner ring is a bearing with a tapered bore, which can be directly installed. Or use an adapter sleeve and a disassembly cylinder for installation on a cylindrical shaft. The cage is made of a steel sheet pressed cage, a polyamide formed cage, and a copper alloy car cage.
Self-aligning ball bearings have two types of structure: cylindrical hole and conical hole. The material of the cage is steel plate, synthetic resin, etc. It is characterized by the spherical shape of the outer ring raceway, with self-alignment, which can compensate for the errors made by the self-aligning ball bearings with different centering degrees and shaft deflections.
Can withstand large radial loads, but also can withstand certain axial loads. The outer ring raceway of this type of bearing is spherical, so it has self-aligning performance. When the shaft is bent or inclined by force, the centerline of the inner ring and the centerline of the outer ring are relatively inclined not more than 1 ° ～ 2.5 °, the bearing can still work .
Self-aligning ball bearings are available in cylindrical and conical shapes. The taper of the conical inner hole is 1: 1 or 1:30. In order to enhance the lubrication performance of the bearing, an annular oil groove and three oil holes are processed on the bearing outer ring.
It mainly bears radial load and can bear small axial load. The axial displacement of the shaft (housing) is limited to the clearance limit, and it has self-aligning performance, allowing normal work under the condition that the inner and outer sides are relatively inclined. It is suitable for parts where the support seat hole cannot strictly guarantee coaxiality.
Self-aligning ball bearings with dust caps and seals are filled with an appropriate amount of grease during assembly. They should not be heated or cleaned before installation, and need not be relubricated during use. They are suitable for operating temperatures-30 ℃ to + 120 ℃ between. Self-aligning ball bearings are mainly used for precision instruments, low-noise motors, automobiles, motorcycles, and general machinery. They are the most widely used bearings in the machinery industry.
Miniature series: 10x, 12x, 13x
Universal series: 12xx, 13xx, 22xx, 23xx
1.Swedish SKF self-aligning ball bearings
2.German FAG self-aligning ball bearings
3. Japan NIN self-aligning ball bearings
Self-aligning ball bearings are suitable for bearing heavy and shock loads, precision instruments, low-noise motors, automobiles, motorcycles, metallurgy, rolling mills, mining, petroleum, papermaking, cement, sugar pressing and other industries and general machinery, etc. .
Classification summary of rolling bearings:
1. Classified by rolling bearing structure type
(1) Bearings can be classified into:
1) Radial bearings ----- Rolling bearings mainly used for bearing radial loads, whose nominal contact angle is from 0 to 45.
According to different contact angles, they are divided into:
Radial contact bearings ----- radial bearings with a nominal contact angle of 0:
Radial angular contact bearings ----- radial bearings with a nominal contact angle greater than 0 to 45.
2) Thrust bearings ----- Rolling bearings mainly used for bearing axial loads, whose nominal contact angle is greater than 45 to 90.
According to the different contact angles, they are divided into:
Axial contact bearings --- Thrust bearings with a nominal contact angle of 90:
Thrust angular contact bearings --- Thrust bearings with a nominal contact angle greater than 45 but less than 90.
(2) Bearings are divided into:
1) Ball bearings ----- rolling elements are balls:
2) Roller bearings ----- The rolling elements are rollers. Roller bearings are divided into:
Cylindrical roller bearings ----- Rolling bodies are cylindrical roller bearings. The ratio of the length to the diameter of the cylindrical roller is less than or equal to 3;
Needle roller bearings-rolling elements are needle roller bearings. The ratio of the length to the diameter of the needle roller is greater than 3, but the diameter is less than or equal to 5mm;
Tapered roller bearings ----- The rolling elements are bearings of tapered rollers;
Spherical roller bearings are rolling bearings that are spherical roller bearings.
(3) Bearings can be divided into:
1) Self-aligning bearing ----- The raceway is spherical, and it can adapt to the angular deviation and angular movement between the two raceway axis lines;
2) Non-aligning bearings (rigid bearings) ----- bearings that can resist the angular deviation of the axial center line between the raceways.
(4) Bearings are divided into:
1) Single-row bearings --- Bearings with a row of rolling elements;
2) Double-row bearings ----- bearings with two rows of rolling elements;
3) Multi-row bearings --- Bearings with more than two rows of rolling elements, such as three-row and four-row bearings.
(5) Bearings can be divided into:
1) separable bearings --- bearings with separable components;
2) Non-separable bearings --- After the bearings are finally matched, the rings cannot be freely separated.
(6) Bearings can be divided into various types of structures according to their structural shapes (if there are no filling grooves, the shapes of inner and outer rings and ferrules, the structure of the ribs, and even the presence of cages).
2. Classified according to the size of rolling bearings Bearings are divided into:
(1) Miniature bearings-bearings with a nominal outer diameter range of 26 mm or less;
(2) Small bearings --- Bearings with a nominal outer diameter range of 28-55mm;
(3) Small and medium-sized bearings --- bearings with a nominal outer diameter range of 60-115mm;
(4) Medium and large bearings-bearings with a nominal outer diameter range of 120-190mm;
(5) Large-sized bearings --- bearings with a nominal outer diameter range of 200-430mm;
(6) Extra large bearings --- bearings with a nominal outer diameter range of 440mm or more.
There are many types and sizes of rolling bearings. In order to facilitate design and selection, the standard specifies the type, size, structural characteristics and tolerance grades of rolling bearings by code. 
National standard: GB / T272-93 (relying on ISO) (replaces GB272-88), the composition of the rolling bearing code is shown in the attached table. Rolling Bearing Code Representation Method Code Purpose: Characterize the structure, size, type, accuracy, etc. of rolling bearings. The code is stipulated by the national standard GB / T272-93. Composition of code:
Front code——representing sub-components of bearing;
Basic code-indicates the main characteristics such as the type and size of the bearing;
Post-code-represents the bearing accuracy and material characteristics.
Inner diameter code: Inner diameter code × 5 = Inner diameter Special case: d = 10 12 15 17 Code: 00 01 02 03 Dimension series code: Used to express bearings with the same inner diameter but different outer diameters and widths. Outer diameter series code: Extra light (0,1), light (2), medium (3), heavy (4) Width series code: Generally the normal width is "0", usually not marked. But "0" cannot be omitted for tapered roller bearings (type 3) and spherical roller bearings (type 2)
Attention issue edit
C3: Radial clearance is larger than normal clearance
K: 1/12 taper hole
K30: 1/30 taper taper hole
M: Steel ball guided machined brass solid cage
2RS: with sealed cover at both ends
TV: Steel ball-guided glass fiber reinforced polyamide (nylon) solid cage
For heavy load, bad working conditions or bearing arrangements with special requirements for sealing, built-in contact sealed spherical roller bearings can be used. The bearing dimensions are exactly the same as non-sealed bearings, which can replace non-sealed bearings in many occasions. The permissible self-aligning angle is 0.5 °, and the working temperature is -20 ℃ ~ 110 ℃. The bearing has been filled with an appropriate amount of lithium-based antirust grease, and grease can also be added according to user requirements. According to the inner ring with or without ribs and the cage used, it can be divided into two basic types: C and CA. The characteristics of C-type bearings are that the inner ring has no ribs and uses steel stamped cages. The characteristics of CA bearings There are ribs on both sides of the inner ring and a solid car cage is used. This type of bearing is especially suitable for working under heavy or vibration loads. Spherical roller bearings are equipped with drum roller bearings between an inner ring with two raceways and a spherical outer ring. 
Identify true and false editors
Whether the steel stamp is clear
Each bearing product is printed with its brand name, label, etc. on the bearing product body. Although the font is very small, the products produced by regular manufacturers use steel stamping technology and embossing before heat treatment. Therefore, although the font is small, it is deep and very clear. Under normal circumstances, the fonts of counterfeit products are not only vague. Because of the rough printing technology, the fonts float on the surface, and some can be easily erased by hand or the marks are severe.
Is there a noise
Hold the inner sleeve of the bearing with your left hand, and turn the jacket with a small amount of reciprocation in the right hand to make it rotate, and listen for any noise during the running of the bearing. Due to the backward production conditions of most counterfeit products and completely manual workshop operation, impurities such as dust and sand will inevitably be mixed into the bearing body during the production process, so when the bearing rotates, noise or unsmooth operation will occur. . This is the key to judging whether the product comes from a branded product of a regular manufacturer with strict production standards and machine operation.
Whether there is turbid oil on the surface
Whether there is turbid oil on the surface This requires us to pay special attention when purchasing imported bearings. Because there is still a certain gap between the domestic rust prevention technology and advanced foreign manufacturing countries, it is easy to leave thick oil marks when the bearing body is rust-proofed, and it feels sticky and thick when contacted by hand. Hardly any trace of anti-rust oil can be seen on the imported bearings. According to industry insiders, particularly careful people can smell a special taste on imported bearings, which is the smell of anti-rust oil.
Whether the chamfer is even
The so-called chamfer of the bearing, that is, the junction of the horizontal and vertical surfaces, due to the limitation of production technology, counterfeit bearing products are not handled satisfactorily at these corners, which can be easily identified.
The packaging is divided into inner packaging and outer packaging. After the bearings are manufactured and qualified, they are cleaned and rust-proofed, and then put into the inner packaging to achieve waterproof, moisture-proof, dust-proof, impact-proof, and maintain the quality and accuracy of the bearings. As well as for ease of use and sale.
The inner packaging of bearings is divided into three categories according to the rust prevention period:
① Short rust-proof period packaging: The rust-proof period is 3 to 6 months, which is suitable for bearings that are delivered to the same subscriber in large quantities and put into use in a short time. Based on the agreement between the two parties, simple packaging is adopted based on the principle of convenience.
② General rust-proof period packaging: The rust-proof period is one year, which is suitable for general purpose bearings.
③ Long anti-rust period packaging: Two-year anti-rust period, suitable for special and precision bearings.
The inner packaging materials of the bearing are polyethylene plastic tube (box), kraft paper, plain and wrinkled polyethylene composite paper, paper box, polyethylene or polyethylene plastic film, nylon fastening tape or plastic braided fastening tape, waterproof high-strength plastic tape , Burlap bags and so on. The above materials must ensure that the material's corrosion resistance test is qualified