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Classification and series analysis of imported bearings
Source: China Bearing Network Time: 2017-12-25
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Deep groove ball bearings are the most commonly used roll bearings. Its layout is simple; easy to use. It is mainly used to accept radial loads; but when the bearing radial clearance is increased; it has the function of a certain angular touch ball bearing; Diameter and axial combined load. When the speed is high and the thrust ball bearing is not suitable; it can also be used to accept the pure axial load. It is comparable to other types of bearings with the same scale; the friction coefficient of such bearings is antagonistic. But it is not resistant to impact. Not suitable for heavy loads.
Deep groove ball bearings are mounted on the shaft; within the axial clearance of the bearing; axial displacement in either direction of the shaft or casing; thus axial positioning in both directions. In addition; The ability to adjust the heart; when it is 2'~10' relative to the hole of the casing; it can still work normally; but it has a certain influence on the bearing life. The deep groove ball bearing is mostly a steel plate stamping wave-shaped frame; Use a metal body to hold the frame.
Deep groove ball bearings are widely used in automobiles, tractors, machine tools, motors, pumps, agricultural machinery, textile machinery, etc.
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The outer ring raceway of the self-aligning ball bearing is spherical; it has a self-aligning function; therefore, it can actively adjust the axial misalignment caused by the deflection of the shaft or the outer casing or the different heart.
Self-aligning ball bearings are mainly subjected to radial loads; together they can accept small axial loads. The axial displacement of the shaft (housing) is constrained within the clearance limit; it has active centering function; it allows for relatively small internal and external skew conditions. Normal operation; suitable for parts where the bearing seat hole can not strictly ensure the coaxiality. The self-aligning ball bearing is a double-row ball bearing which is processed into a spherical shape in the outer ring raceway and has two deep groove raceways in the inner ring; Heart function. It is mainly used to accept radial load; it can accept radial load together; it can also accept a small amount of axial load; but it usually can not accept pure axial load; its limit speed is lower than that of deep groove ball bearing. Bearings are mostly used on double-supported shafts that are prone to twists and turns under load; and double-bearing holes cannot ensure strict coaxiality; however, the relative skew of the middle line of the inner ring and the outer ring of the outer ring must not exceed 3 degrees.
Primary use: electromechanical equipment - plastic machinery operating equipment - textile machinery drive shaft medical equipment - fitness and sports equipment
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Spherical roller bearings are between the inner ring with two raceways and the outer ring with spherical races; the bearings are equipped with drum rollers. The middle of the curvature of the raceway surface of the outer ring is common with the bearing; so it has the initiative Self-aligning ball bearing the same self-aligning function. When the shaft and outer casing are deflected; can be actively adjusted; do not increase the shaft to bear negative. Spherical roller bearings can accept radial load and axial load in two directions. Radial load It can be used for heavy load and impact load. The inner ring inner diameter is the bearing of the tapered hole; it can be directly installed. Or use the tightening sleeve and the unpacking device on the cylindrical shaft. Polyamide forming holder and copper alloy car holder.
Spherical roller bearings can accept large radial loads; they can also accept a certain axial load. The outer ring raceway of this type of bearings is spherical in shape; therefore, it has a self-aligning function; when the shaft is subjected to bending or skewing, The inner ring of the inner ring and the middle line of the outer ring do not exceed 1°~2. 5°; the bearing can still work. The inner diameter of the spherical roller bearing has two kinds of cylindrical and conical shapes. The taper of the conical inner hole is 1:1 2 or 1:30. In order to strengthen the smooth function of the bearing; machine the annular oil groove and three uniform oil holes on the outer ring of the bearing.
Spherical roller bearings are suitable for receiving heavy loads and impact loads; they are widely used in metallurgy, rolling mills, mining, petroleum, paper, cement, sugar and other occupations.
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Cylindrical roller bearings are separate bearings; the device and disassembly are very convenient. Cylindrical roller bearings are divided into single row, double row and four columns.
According to the bearing, the number of rows of rolling elements is different; cylindrical roller bearings can be divided into single-row, double-row and multi-row cylindrical roller bearings. Among them, there are more single-row cylindrical roller bearings with a support frame. In addition, there are Cylindrical roller bearings of other layouts, such as single or double row full complement rollers.
Single row cylindrical roller bearings are classified into N type, NU type, NJ type, NF type and NUP type according to the different ferrule ribs. Cylindrical roller bearings can receive large radial load; according to the layout of the ferrule ribs It also accepts a certain one-way or two-way axial load.
NN type and NNU double row cylindrical roller bearings have compact layout; strong rigidity; large bearing capacity; deformation after load. è –å˜¤ç³œè¯¨.岬, FC, FCD, FCDP four-row cylindrical roller bearings are acceptable Large radial load; mostly used in heavy machinery such as rolling mills.
Cylindrical roller bearings are mainly used in motors, machine tools, petroleum, rolling mill loading and unloading machinery and various industrial machinery.
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The tapered roller bearing mainly accepts the radial and axial combined load. The bearing bearing capacity depends on the raceway viewpoint of the outer ring; the larger the viewpoint, the greater the bearing capacity. This type of bearing is a separate bearing; The number of columns of the rolling body is divided into single-row, double-row and four-row tapered roller bearings. The single-row tapered roller bearing clearance needs to be adjusted by the user when the device is installed. The double-row and four-row tapered roller bearing clearances have been based on the product. User requirements are given; no user adjustment is required.
Tapered roller bearings have conical inner and outer ring raceways; tapered rollers are placed between the two. The projection lines of all cones are agglomerated at the same point on the bearing axis. This depiction makes tapered roller bearings unique It is suitable to accept composite (radial and axial) loads. The axial load of the bearing can be mostly determined by the touch angle α. The larger the α viewpoint, the higher the axial load. The viewpoint size is indicated by the calculation coefficient e. The larger the e value; the larger the touch point of view; the greater the applicability of the bearing to accept the axial load.
Tapered roller bearings are usually disengaged; that is, the conical inner ring assembly consisting of the inner ring with the roller and the holder assembly can be separated from the conical outer ring (outer ring). The tapered roller bearing is primarily accepted in the radial direction. Main diameter and axial joint load. Bearing bearing capacity depends on the raceway viewpoint of the outer ring; the larger the viewpoint, the greater the bearing capacity. This type of bearing is a separate bearing; it is divided into single row and double according to the number of rows of rolling elements in the bearing. Column and four-row tapered roller bearings. The single-row tapered roller bearing clearance needs to be adjusted by the user when the device is installed. The double-row and four-row tapered roller bearing clearances are given according to the user's requirements when the product leaves the factory; no user adjustment is required.
Tapered roller bearings are widely used in automobiles, rolling mills, mining, metallurgy, plastic machinery and other occupations.
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Angular touch ball bearings can accept both radial and axial loads. They can work at higher speeds. The larger the touch angle is, the higher the axial load is. The high precision and high speed bearings usually take a 15 degree touch angle. Under the force effect; the touch angle will increase. The single-row angular touch ball bearing can only accept the axial load in one direction; when receiving the radial load; it will lead to the additional axial force. And can only constrain the shaft or the shell in one direction. Axial displacement. If paired double device; make the outer ring of a pair of bearings opposite; that is, the wide end faces the wide end face; the narrow end faces the narrow end face. This prevents the additional axial force from being caused; and can be in both directions Constrain the shaft or housing within the axial clearance range.
The angular touch ball bearing can have a relative displacement on the horizontal axis due to the inner and outer ring raceways; therefore, it can accept the radial load and the axial load combined load (the single row angular touch ball bearing can only accept the unidirectional axial load; thus usually It is often used as a pair of devices.) The materials used in the frame are brass, synthetic resin, etc.; they are distinguished by bearing method and operating conditions.
The angular touch ball bearings are: 7000C type (âˆ=15°), 7000AC type (âˆ=25°) and 7000B (âˆ=40°). The lock of this kind of bearing is on the outer ring; usually the inner and outer rings Can not be separated; can accept the combined load of radial and axial and the axial load in one direction. The ability to accept the axial load can be determined by the touch angle; the touch angle is large; the ability to accept the axial load is high. Axial displacement of the shaft or casing in one direction.
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The thrust ball bearing consists of a row of steel balls (with the holding frame), a shaft ring (cooperating with the shaft) and a seat ring (with a gap with the shaft and tightly with the bearing housing hole); the steel ball is in the shaft ring and the seat ring Rotating. Can only accept axial load in one direction; can not accept radial load. Because the axial load is evenly distributed on each steel ball; so the load can be larger, but the operation; the temperature rise is large; The limit speed is lower.
Thrust ball bearings cannot constrain the radial movement of the shaft or casing; however, they can constrain the axial movement of the shaft and the casing in one direction; thus; such bearings are usually used in conjunction with deep groove ball bearings; the axes of the shaft and housing bores are It is necessary to adhere to the concentricity; otherwise, the bearing will be prematurely damaged due to stress gathering. In order to eliminate this undesirable phenomenon, a radial gap of 0. 5 to 1 mm may be left between the outer diameter of the race and the hole of the casing. The middle of the shaft and the outer casing support The surface should be straight; do not allow the shaft to be skewed and flexed; otherwise, the bearing will be prematurely damaged due to uneven load spread. To eliminate the skew of the bearing axis; the elastic support can be placed on the outer surface of the seat; such as oil resistant rubber , leather, etc.; or use a thrust ball bearing with a spherical seat.
The thrust ball bearing is a separate bearing; it is divided into a one-way thrust ball and a two-way thrust ball bearing according to its layout method. The one-way thrust ball bearing can accept the axial load in one direction; the two-way thrust ball bearing can accept the axial direction in two directions. Loads. They are not able to accept radial loads. Thrust ball bearings also have a seat cushion layout; because the seat surface of the seat cushion is spherical, the bearing has a centering function; it can reduce the influence of device errors.
1. Thrust ball bearings are mainly used in automobiles, machine tools and other occupations.
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The thrust cylindrical roller bearing is a separate bearing; it can only accept one-way axial load and slight impact; it can restrain the axial displacement of the shaft (or outer casing) in one direction; thus it can be used as one-way axial positioning. Far greater than the thrust ball bearing. When the roller rolls; because the speed of the two ends of the roller is not the same; the roller is prevented from slipping on the raceway of the ferrule; therefore; the limit speed of such a bearing is lower than that of the thrust ball bearing; Only for low speed work.
The thrust cylindrical roller bearing described in the specification adopts the metal body of the vehicle to adhere to the frame; according to the user's requirements; other types or materials can be used for the support frame. The thrust tapered roller bearing can only accept the one-way axial load; Axial displacement; it can be used as one-way axial positioning. Compared with thrust cylindrical roller bearings; bearing capacity can be large, relative sliding.
1. Thrust cylindrical roller bearings are mainly used in heavy machinery, high power marine gearboxes, oil rigs, vertical motors and other machinery.
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The outer spherical ball bearing is a variant of the deep groove ball bearing in practice; its characteristic is that the outer diameter of the outer ring is spherical; it can be fitted into the corresponding concave spherical surface of the bearing seat to achieve the effect of self-aligning.
Although its fundamental function should be similar to that of deep groove ball bearings; however, most of these bearings are used in relatively rough machines; the positioning of the device is not accurate; the axis of the shaft and the hole is poorly centered; or the axis is long and the deflection is In the larger condition; and the accuracy of the bearing itself is not high; some layouts are also rough; therefore, the practice of the common function reflects the appropriate standard fasteners for the deep groove ball bearings. For example, the outer spherical ball with the top wire The bearing is applied to the through shaft with large difference in stiffness; the bearing has sealing ring on both sides; it can prevent the intrusion of dirt tightly; the excess smoothing agent is loaded at the factory; the device does not need to be removed before the device; no smoothing agent is needed; The top wire screw on the protruding end of the inner ring is fastened on the shaft. The axial load of the promise shall not exceed 20% of the additional dynamic load.
The outer spherical ball bearing with the partial pain sleeve is the same as the outer spherical bearing with the top wire; only the top wire is not on the inner ring; instead, it is on the partial pain sleeve. The inner hole of the tapered spherical outer spherical ball bearing is the belt 1: 12-cone tapered bore; can be mounted directly on the tapered shaft; or with a tight bushing on the shaft without the shoulder; fine-tuning the bearing clearance.
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Needle roller bearings are roller bearings with cylindrical rollers; relative to their diameter; the rollers are both thin and long. These rollers are called needle rollers. Although they have a small cross section; the bearings still have a high load acceptance; Therefore; uniquely suitable for radial space constrained occasions.
The general surface of the needle roller is slightly shortened at the proximal end. The results of the touch correction of the needle roller and the raceway prevent the occurrence of destructive marginal stress. In addition to the catalogue, it can be used for bearings in normal engineering; eg open stamping Needle roller bearings (1), closed cup needle roller bearings (2), needle roller bearings with inner ring (3) and needle roller bearings without inner ring (4); SKF is also available in various types. Needle roller bearing; there are: 1, needle roller holder frame assembly 2, no-rible needle roller bearing 3, self-aligning needle roller bearing 4, combined needle roller/ball bearing 5, combined needle roller/thrust ball bearing 6, combined roller Needle / cylindrical roller thrust bearing.
The drawn cup needle roller bearing is a needle roller bearing with a thin stamped outer ring. Its primary feature is that the section height is very low and the load can be high. The first is for compact layout, low price and the bearing housing bore cannot be used as a needle roller. Bearing equipment bearing frame raceway. Bearing and bearing box must be dry and cooperative method. If the axial positioning function such as box shoulder and stop ring can be omitted; then; the inner hole of the bearing box can be made very simple and economical. .
The drawn cup needle roller bearings mounted on the shaft end have double-sided open type (1) and single-side closed type (2). The base end face of the closed outer ring can accept less axial guiding force.
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Linear bearing is a linear motion system produced at low cost; it is used in combination with the cylindrical shaft for infinite stroke. Because the bearing ball and the shaft are touched by a point, the load is small. The steel ball rotates with a very small frictional resistance; Achieve high-precision smooth motion.
Linear bearings are widely used in electronic equipment; tensile testing machines and digital three-dimensional coordinate measuring equipment; and multi-axis machine tools, punching machines, machine grinders, active gas cutting machines, printers, card sorters, food packaging machines and other industrial machinery sliding component.
*The grease smooth linear bearing is internally written with anti-corrosion oil; if the grease is smooth, first remove the anti-corrosion oil with kerosene or organic solvent; then add grease after air drying.
It is advocated to use a lithium soap smooth grease with a tack mark of N0.
*Oil smooth If the oil is smooth, do not remove the anti-corrosion oil. According to the temperature change, the smooth oil with ISO viscosity grade VG15-100 can be selected. The shaft can be smoothed from the oil supply pipe or from the oil hole on the outer bearing seat. Because the sealing ring will scrape off the smooth oil; the oil is smooth and not suitable for non-porous bearing with sealing ring.
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