Sliding bearings
Sliding bearings are not divided into inner and outer rings and there is no rolling body, generally made of wear-resistant materials. Commonly used in low speed, heavy load and lubrication and maintenance of difficult mechanical rotation parts.
Spherical bearings
Spherical bearings have a spherical sliding contact surface and are mainly used in oscillating, tilting and rotating motions.
Rolling bearings Rolling bearings are divided into radial bearings and thrust bearings according to the direction of the load they can bear or the nominal contact angle. Among them, radial contact bearings are centripetal bearings with a nominal contact angle of 0, and centripetal angular contact bearings are centripetal bearings with a nominal contact angle greater than 0 to 45. Axial contact bearings are thrust bearings with a nominal contact angle of 90, and thrust angular contact bearings are thrust bearings with a nominal contact angle greater than 45 but less than 90. According to the shape of the rolling body can be divided into ball bearings and roller bearings. Roller bearings according to the roller type is divided into: cylindrical roller bearings, needle roller bearings, tapered roller bearings and spherical roller bearings. According to its work can be centering is divided into spherical bearings ---- raceway is spherical shape, can adapt to the two raceway axis line between the angular deviation and angular movement of the bearing and non-aligning bearings (rigid bearings) ---- can impede the raceway between the axis line angular deviation of the bearing. According to the number of columns of rolling body is divided into single row bearings, double row bearings and multi-row bearings. According to its components (collar) can be separated into separable bearings and non-separable bearings. According to its structure and shape (such as with or without filling groove, with or without inner and outer rings and the shape of the ring, the structure of the edge, and even with or without cage, etc.) can also be divided into a variety of structural types. According to its outer diameter size is divided into miniature bearings (<26mm), small bearings (28-55mm), small and medium-sized bearings (60-115), medium and large bearings (120-190mm), large bearings (200-430mm) and very large bearings (>440mm). According to the application field, they are divided into motor bearings, rolling mill bearings, main bearings and so on. According to material, they are divided into ceramic bearings, plastic bearings, etc. Deep groove ball bearings
Deep groove ball bearings are the most representative rolling bearings. Compared with other types of bearings with the same size, this type of bearing has small friction coefficient, high limiting speed, simple structure, low manufacturing cost, high precision, no need for frequent maintenance, and the size range is large, many forms, is the most widely used type of bearing. It mainly bear radial load, can also bear a certain amount of axial load. When it only bear radial load, the contact angle is zero.
Deep groove ball bearing mounted on the shaft, in the bearing axial clearance range, can limit the axial displacement of the shaft or shell in both directions, so can be in both directions for axial orientation. When the deep groove ball bearing has a large radial clearance, has the performance of angular contact bearing, can withstand large axial load. In the axial load is very large high-speed operating conditions, deep groove ball bearings than thrust ball bearings have more superiority. In addition, this kind of bearing also has certain centering ability, when relative to the shell hole tilt 2′ ~ 10′, still can work normally, but on the bearing life has certain effect.
Angular contact ball bearings
Generally used to be called 36, 46-type bearings on behalf of the six types of bearings, angular contact is generally 15 degrees, 25 degrees, 45 degrees, etc..
Spherical ball bearings
Spherical ball bearings are two races of the inner ring and raceway for the spherical surface of the outer ring, assembled with spherical ball bearings. The curvature center of the outer raceway surface is the same as the bearing center, so it has the same centering function as the self-aligning ball bearings. In the event of deflection of the shaft and shell, it can be adjusted automatically without increasing the burden on the bearing. Spherical roller bearings can withstand radial load and axial load in two directions. Spherical ball bearings have large radial load capacity and are suitable for cases with heavy loads and shock loads. Bearings with tapered bore inner diameter of inner ring can be mounted directly. Or use the tightening sleeve, dismantling cylinder mounted on the cylindrical shaft. The cage is made of steel plate stamping cage, polyamide molding. Self-aligning ball bearings are suitable for heavy loads and shock loads, precision instruments, low noise motors, automobiles, motorcycles, metallurgy, rolling mills, mines, petroleum, papermaking, cement, sugar and other industries and general machinery.
Thrust ball bearings
Thrust ball bearings are divided into one-way and two-way. They can only withstand axial loads, and can never withstand any radial loads. Thrust bearings are divided into two parts: the tight ring and the live ring. Tight ring and shaft sleeve tight, live ring support in the bearing seat. The collar and rolling body is usually used high strength, good wear resistance of rolling bearing steel manufacturing, quenching surface hardness should reach HRC60 ~ 65. keep frame is made of soft steel stamping, can also be used in copper alloy folder cloth plastic wood or plastic and other manufacturing.
Two-way thrust angular contact ball bearing
Thrust angular contact ball bearing contact angle is generally 60 ° commonly used thrust angular contact ball bearing is generally two-way thrust angular contact ball bearing, mainly used for precision machine tool spindles, generally with double row cylindrical roller bearings together with the use of two-way axial load can be borne, with high precision, good rigidity, low temperature rise, high speed, easy to assemble and dismantle and other advantages.
Thrust roller bearings
Including thrust cylindrical roller bearings, thrust tapered roller bearings, thrust needle roller bearings and thrust spherical roller bearings.
Needle roller bearings
Needle roller bearings are equipped with thin and long roller (roller length for the diameter of 3 ~ 10 times, the diameter is generally not more than 5mm), so the radial structure of the compact, and its inner diameter size and load capacity and other types of bearings with the same, the smallest outside diameter, especially for radial mounting dimensions of the support structure is limited. Needle roller bearings according to the use of different occasions, can choose no inner ring bearings or needle and cage assembly, at this time and bearing with the journal surface and shell hole surface directly as the bearing of the inner and outer rolling surface, in order to ensure the load capacity and running performance and have the same ring bearings, the shaft or shell hole raceway surface hardness, machining accuracy and surface quality should be with the bearing ring. Usage combination needle roller bearing is by the centripetal needle roller bearing and thrust bearing parts combination of bearing unit, its structure is compact and small volume, high rotational accuracy, can withstand high radial load at the same time to bear a certain amount of axial load. And the product structure of various forms, wide adaptability, easy to install. Combined needle roller bearings are widely used in machine tools, metallurgical machinery, textile machinery and printing machinery and other mechanical equipment, and can make the mechanical system design is very compact and dexterous.
Outer spherical ball bearings
Outer spherical ball bearing outer diameter surface for the sphere, can play the role of self-aligning.
Spherical roller bearings
Spherical roller bearings have two rows of symmetrical spherical rollers, mainly to bear radial load, but also can withstand either direction of the axial load, but can not withstand pure axial load. This type of bearing outer ring raceway is spherical, so its centering performance is good, can compensate for coaxial error, when the shaft force bending or installation of different heart bearing can still be used normally, centering with the bearing size series different, the general allowable centering angle of 1 ~ 2.5 degrees, this type of bearing load capacity, in addition to withstand the radial load bearings can also withstand the two-way action of the axial load, has a better Shock resistance, generally speaking, spherical roller bearings are allowed to work at a lower speed. Suitable for heavy load or vibration load work.
Flange bearing
Flange bearing outer wheel with flange flange. Characterized by the ability to simplify the host structure, reduce the size of the host, so that the bearing is easier to locate.
Housed bearings
Radial bearings and seat combination of a component, in parallel with the axis of the bearing on the support surface there is a mounting screws on the base plate.
Combination bearings
A set of bearings at the same time by the above two or more forms of bearing structure combination of rolling bearings. Such as needle and thrust cylindrical roller combination bearings, needle and thrust ball combination bearings, needle and angular contact ball combination bearings.
Linear bearings
Linear bearings are divided into metal linear bearings and plastic linear bearings.
Metal linear bearings are a low-cost production of linear motion systems for infinite travel used in conjunction with cylindrical shafts. Since the load-bearing balls are in point contact with the shaft, low loads are used. The balls rotate with very little frictional resistance, enabling smooth motion with high precision.
Plastic linear bearing is a kind of self-lubricating characteristics of linear motion system, the biggest difference between its metal linear bearings is metal linear bearings is rolling friction, bearing and cylindrical shaft is a point contact, so this is suitable for low load high-speed movement; and plastic linear bearings are sliding friction, bearing and cylindrical shaft is a surface contact, so this is suitable for high load in the low-speed movement. Bearing steel characteristics:
One, contact fatigue strength bearings in the role of cyclic load, the contact appearance is easy to attack fatigue damage, that is, the emergence of cracking spalling, which is an important damage situation of the bearing. Therefore, in order to improve bearing life, bearing steel must have high contact fatigue strength.
Two, wear resistance
Bearing task, the collar, rolling body and maintain the frame between not only rolling friction, but also will have a sliding friction, so that the bearing parts have been worn. In order to increase the wear and tear of bearing parts, maintain bearing accuracy and stability, extend service life, bearing steel should have very good wear resistance.
Three, hardness
Hardness is one of the important quality of the bearing quality, contact fatigue strength, wear resistance, elastic limit has an indirect effect. Bearing steel in the use of individual hardness to reach HRC61 ~ 65, the ability to make the bearing to achieve high contact fatigue strength and wear resistance.
Four, rustproof performance
In order to avoid bearing parts and finished products in processing, sending and use of the course of erosion and rust, the request bearing steel should have good rustproof performance.
Five, processing performance
Bearing parts in the consumption process, to go through a number of cold, hot machining process, in order to satisfy a small amount of high-efficiency, high-quality request, bearing steel should have good processing performance. For example, cold, hot molding performance, cutting performance, hardenability.
Bearing steel in addition to the above basic requirements, but also should reach the appropriate chemical composition, the average external organization, non-metallic admixtures, the external appearance of shortcomings in line with the norms, as well as the appearance of decarburization layer does not exceed the concentration of the rules and other requirements.