[Plastic linear bearings] share the type of bearings
A bearing ("Bearing", the Japanese name "shaft bearing") is a component that fixes and reduces the coefficient of load friction during mechanical transmission. It can also be said that when other components are moving relative to each other on the shaft, the components used to reduce the friction coefficient during power transmission and keep the center position of the shaft fixed. Bearing is a pivotal component in contemporary mechanical equipment. Its main function is to support mechanical rotating bodies to reduce the mechanical load friction coefficient of the equipment during transmission. According to the different friction properties of moving elements, bearings can be divided into two types: rolling bearings and plain bearings.
1. Needle roller bearings
Needle roller bearings are equipped with thin and long rollers (the length of the rollers is 3 to 10 times the diameter, and the diameter is generally not more than 5 mm). Therefore, the radial structure is compact, and its inner diameter and load capacity are the same as those of other types of bearings. The diameter is the smallest, which is especially suitable for supporting structures with limited radial installation size. Needle roller bearings can be used without inner ring or needle roller and cage assembly according to different applications. The hole surface is directly used as the inner and outer rolling surface of the bearing. In order to ensure the load capacity and running performance are the same as those of the bearing with a ring, the hardness, machining accuracy and surface quality of the surface of the shaft or housing hole raceway should be the same as the bearing ring. Needle bearing is a bearing unit composed of radial needle roller bearing and thrust bearing components. It has a compact structure, small size, high rotation accuracy, and can withstand a certain axial load while bearing a high radial load. And the product structure is diverse, adaptable and easy to install. Combined needle roller bearings are widely used in machine tools, metallurgical machinery, textile machinery and printing machinery, and can make mechanical system designs very compact and smart.
2. Self-aligning ball bearings
Self-aligning ball bearings: Between the inner ring of the two raceways and the outer ring of the raceway are spherical roller bearings. 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. Self-aligning ball bearings have a large radial load capacity and are suitable for heavy and shock loads. 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 steel stamping cage and polyamide molding. 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, pressing Sugar and other industries and general machinery.
3. Thrust roller bearings
The rolling element is a thrust rolling bearing of a roller.
4. Spherical roller bearings
Spherical roller bearings are bearings in which drum rollers are assembled between an inner ring with two raceways and a spherical outer ring.
Spherical roller bearings have two rows of rollers, which mainly bear a load of a diameter and can also bear axial loads in any direction. With high radial load capacity, it is especially suitable for working under heavy or vibration loads, but cannot withstand pure axial loads. This type of bearing's outer ring raceway is spherical, so its self-aligning performance is good, and it can compensate for coaxiality errors.
Spherical roller bearings have two rows of symmetrical spherical rollers, the outer ring has a common spherical raceway, the inner ring has two raceways inclined at an angle to the bearing axis, and has good self-aligning performance. When the shaft is stressed The bearing can still be used normally when it is bent or installed with different concentricity. The self-aligning performance varies with different bearing size series. Generally, the permitted self-aligning angle is 1 ~ 2.5 degrees. This type of bearing has a large load capacity and can bear radial loads. The outer bearing can also withstand the axial load acting in both directions, and has better impact resistance. Generally speaking, the working speed allowed by the spherical roller bearing is relatively low.
Double-row tapered roller bearings Spherical roller bearings are divided into two different structures, symmetrical spherical rollers and asymmetric spherical rollers, according to the cross-sectional shape of the rollers. Asymmetric spherical roller bearings are early products, mainly for the host. Maintenance services. Symmetric spherical roller bearings are rarely selected when the main engine is newly designed. The internal structure has been completely improved and the parameters have been optimized. Compared with the spherical roller bearings produced earlier, it can withstand greater axial loads. This bearing has a lower operating temperature, so it can meet the requirements of higher speeds. According to the inner ring with or without ribs and the cage used, it can be divided into two types: C and CA. The characteristic of C-type bearings is the inner ring. Without flanges and using steel stamped cages, CA-type bearings are characterized by flanges on both sides of the inner ring and a solid car cage. In order to improve bearing lubrication, users can be provided with an annular oil groove on the outer ring and Spherical roller bearings with three oil holes are indicated by bearing rear code / W33. Spherical roller bearings with inner ring oil holes can also be supplied according to user requirements. In order to facilitate customers' assembly and disassembly and replacement of bearings, we can also provide Taper Spherical roller bearing bearings, taper hole taper is 1:12, and the later code is K. In order to meet the requirements of special users, bearings with an inner hole taper of 1:30 can also be provided, and the latter code is K30. The bearing can be directly mounted on the tapered journal by a lock nut, or it can be installed on the cylindrical journal by means of an adapter sleeve or a withdrawal sleeve.
Thrust bearing is divided into two parts: tight ring and live ring. The tight ring is tightly connected with the shaft sleeve, and the movable ring is supported on the bearing seat. The rings and rolling elements are usually made of rolling bearing steel with high strength and good wear resistance. The surface hardness after quenching should reach HRC60 ～ 65. The cages are mostly made of soft steel stamping, and can also be made of copper alloy cloth bakelite or plastic.
5. Thrust spherical roller bearings
The rolling elements are self-aligning thrust rolling bearings with convex spherical or concave rollers. The raceway of a bearing race with a convex spherical roller is spherical, and the raceway of a bearing race with a concave spherical roller is spherical.
Linear bearings are divided into metal linear bearings and plastic linear bearings
Metal linear bearing is a linear motion system produced at low cost for use with cylindrical shafts with infinite stroke. Because the load ball is in point contact with the shaft, the use load is small. The steel ball rotates with very little frictional resistance, so that it can obtain high-precision and smooth movement.
Plastic linear bearings are a kind of linear motion system with self-lubricating characteristics. The biggest difference between metal linear bearings and metal linear bearings is that metal linear bearings are rolling friction, and the point contact between the bearing and the cylindrical shaft is suitable for low-load and high-speed motion. Plastic linear bearings have sliding friction, and there is surface contact between the bearing and the cylindrical shaft, so this is suitable for high loads at low speeds;
Thrust Cylindrical Roller Bearings Spherical Roller Bearings Rolling bodies are thrust rolling bearings of cylindrical rollers. Thrust Tapered Roller Bearing: The rolling elements are thrust rolling bearings with tapered rollers.
7. Thrust needle bearings
The rolling element is a thrust rolling bearing of a needle.
A component in which a radial bearing and a seat are combined, and a base plate for mounting screws is provided on a supporting surface parallel to the axis line of the bearing.
9, joint axis
The sliding contact surface of thrust ball bearing is spherical, which is mainly suitable for spherical sliding bearings with swing motion, tilt motion and rotary motion.
Bearing A set of bearings is a rolling bearing composed of the above two types of bearing structures at the same time. Such as needle roller and thrust cylindrical roller combined bearings, needle roller and thrust ball combined bearings, needle roller and angular contact ball combined bearings, etc.
Other bearings: Rolling bearings of structures other than the above.
Sliding bearings: Sliding bearings have no rolling elements regardless of the inner and outer rings. They are generally made of wear-resistant materials. Commonly used for low-speed, heavy-duty, lubricating and difficult-to-maintain mechanical rotating parts.
Rolling mill bearings
Tapered roller bearing rolling mill bearings are generally only used to withstand radial loads. Compared with deep groove ball bearings of the same size, they have a larger radial load capacity, and the limiting speed is close to deep groove ball bearings. The processing requirements of the shaft and housing holes are high, allowing the inclination of the inner ring axis and the outer ring axis to be small (2 ° -4 °). If the two axis tilt exceeds the limit, the contact between the roller and the raceway of the ring will deteriorate. , Which seriously affects the load capacity of the bearing and reduces the service life of the bearing. Therefore, if this type of bearing needs to be installed in the host component that bears the axial load, it can only be used under the premise that other types of bearings are used at the same time to bear the axial load.
Angular contact ball bearings
Generally speaking, the six types of bearings called 36 and 46 bearings are generally used, and the angular contact is generally 15 degrees, 25 degrees, and 45 degrees.
Thrust angular contact ball bearings , Can withstand bidirectional axial load, has the advantages of high accuracy, good rigidity, low temperature rise, high speed, convenient assembly and disassembly.
Deep groove ball bearing
Each ferrule of a deep groove ball bearing has a continuous groove type raceway whose cross section is approximately one third of the equatorial circumference of the ball. Deep groove ball bearings are mainly used to support radial loads and can also bear certain axial loads. When the radial clearance of the bearing increases, it has the properties of an angular contact ball bearing and can withstand axial loads that alternate in two directions. Compared with other types of bearings of the same size, this type of bearing has a small friction coefficient, high limiting speed, and high accuracy, and is the preferred bearing type when users select a type. Deep groove ball bearings have a simple structure and are easy to use. They are the largest type of imported bearings with the largest production volume and the widest application range.
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