Deep groove ball bearing (GB / T 276-2003), formerly known as single row radial ball bearing, is one of the most widely used rolling bearings. It is characterized by small friction resistance and high speed. It can be used to bear radial load or combined radial and axial load at the same time. It can also be used to bear axial load, such as small power motor, automobile and tractor gearbox, machine tool gearbox, general machines, tools, etc.
The self-aligning ball bearing has cylindrical hole and conical hole. The cage is made of steel plate and synthetic resin. Its feature is that the outer ring raceway is spherical, with automatic self-aligning, which can compensate the errors caused by different centrality and shaft deflection, but the relative inclination of the inner and outer rings shall not exceed 3 degrees.
Angular contact ball bearing can bear radial load and axial load at the same time. It can work at high speed. The larger the contact angle is, the higher the axial bearing capacity is. The contact angle is the angle between the line of contact point between ball and raceway in radial plane and the vertical line of bearing axis. The contact angle of high precision and high speed bearings is usually 15 degrees. Under the action of axial force, the contact angle will increase.
Fastener is a kind of mechanical part which is used for fastening and connection and widely used. Fasteners are widely used in the industry, including energy, electronics, electrical appliances, machinery, chemical industry, metallurgy, mold, hydraulic and other industries. Various fasteners can be seen on various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemical industry, instruments and supplies, and are the most widely used mechanical foundation. It is characterized by various varieties, specifications, different performance and use, and the degree of standardization, serialization and generalization is also very high. Therefore, some people call a kind of fastener which has national standard as standard fastener or referred to as standard fastener.
The rolling body is the centripetal rolling bearing of the cylindrical roller. The internal structure of cylindrical roller bearing adopts parallel arrangement of rollers. The spacing holder or isolation block is installed between the rollers, which can prevent the inclination of rollers or friction between rollers, and effectively prevent the increase of rotating torque.
The self-aligning roller bearing has double row rollers, the outer ring has one common spherical raceway, and the inner ring has two raceways, which are inclined at an angle relative to the bearing axis. This ingenious structure makes it self-aligning, so it is not easy to be affected by the angle between the shaft and the bearing housing seat on the error or shaft bending. It is suitable for the occasion of angle error caused by installation error or shaft bending. The bearing can not only bear the radial load, but also the axial load of two-way action.
The inner bore of self-aligning roller bearing has two kinds: cylindrical and conical. The taper of conical bore is 1:30 and 1:12. This kind of tapered bore bearing can be easily and quickly assembled on the optical shaft or the stepped shaft by using the tightening sleeve or the withdrawal sleeve.
Tapered roller bearing belongs to the separate type bearing, and the inner and outer rings of the bearing have tapered raceway. The bearing is divided into single row, double row and four row tapered roller bearing according to the number of columns installed. Single row tapered roller bearings can bear radial load and single direction axial load. When bearing is under radial load, one axial force will be generated, so when another bearing can bear the axial force in the opposite direction is needed to balance.
The thrust ball bearing is designed to bear thrust load at high speed, which is composed of washer ring with ball rolling raceway groove. Because the ring is cushion shaped, the thrust ball bearing can be divided into two types: flat bottom cushion type and self-aligning spherical cushion type. In addition, the bearing can bear axial load, but not radial load.
RNES spindle bearings are single row angular contact ball bearings composed of solid inner ring, outer ring, ball and cage assembly with solid window cage, which can not be removed. These RNES bearings can be open and sealed.
Needle roller and cage assembly (needle roller bearing) is an independent rolling element. The distance between the two guide surfaces of the cage is wide, which can not only guide the needle accurately, but also maintain the correct position of the needle roller. This kind of bearing is suitable for the occasions where the shaft and seat hole can be used as raceway. Only by machining the raceway of the shaft and bearing seat hole to the specified dimensional accuracy and geometric accuracy, the high rotation accuracy of the minimum space can be ensured.
Stamping outer ring needle roller bearing is an assembly, which has two types: open type and closed type. The assembly comprises a thin-walled stamping outer ring, a needle roller and a cage assembly.
Machining needle roller bearing is a kind of roller bearing with cylindrical roller. The roller is thin and long relative to its diameter. This kind of roller is called needle roller. Although the bearing has a small cross section, it still has a high load bearing capacity, so it is especially suitable for the occasions with limited radial space. According to the use of radial space limited occasions. The bearing without inner ring or needle roller and cage assembly can be selected according to different application occasions. At this time, the journal surface and shell hole surface matched with the bearing are directly used as the inner and outer rolling surfaces of the bearing. In order to ensure the same load capacity and running performance as the ring bearing, the hardness, machining accuracy and surface quality of the shaft or shell hole raceway surface should be the same as those of the bearing The raceway of the ferrule is similar. This kind of bearing can only bear radial load.
The stamping outer ring needle roller clutch is the same as the outer ring wheel overrunning clutch. The needle roller is a locking element. The utility model is composed of a thin-wall stamping outer ring, a cage, a special-shaped spring embedded in the cage and a locking element needle roller installed in the cage.
The special-shaped spring makes the needle stick to the eccentric arc working face of the inner diameter of the stamping outer ring all the time. Because the quality of the needle is very small, it allows a higher conversion frequency and has a high reverse locking accuracy. Commonly used in printing machinery, packaging machinery, textile machinery, food machinery, household appliances, light industry machinery and testing equipment. The constant torque is 0.34n · m ~ 121n · m, suitable for high speed, generally 3900 ~ 34000r / min. When using this kind of clutch, the hardness of the shaft used by users should reach HRC58-62.
Screw rod support bearing is a special bearing for screw rod, which belongs to thrust angular contact bearing. It has larger contact angle than general angular contact bearing and can bear larger axial force.
According to the ISO classification standard, high precision bearings are divided into: P0, P6, P5, P4, P2. The grades increase in turn, among which P0 is ordinary precision, and other grades are precision grade. Of course, different classification standards and different types of bearings have different classification methods, but the significance is the same. The performance of precision bearing requires that the rotating body should have high beating precision, high-speed rotation and small change of friction.
The outer spherical ball bearing is actually a variant of the deep groove ball bearing, which is characterized by the spherical outer diameter surface of its outer ring, which can be fitted into the corresponding concave spherical surface of the bearing seat to play the role of self-aligning. Outer spherical bearing is mainly used to bear radial and axial combined load which is mainly radial load. Generally, it is not suitable to bear axial load alone.
Idler gear tooth unit refers to the transmission gear between two non-contact transmission gears, which mesh with the two gears at the same time to change the rotation direction of the passive gear and make it the same as the driving gear. Its function is only to change the steering, but not the transmission ratio. It is called idler.
Turntable bearing block is a kind of large and extra large bearing block which can accept comprehensive load and has special structure. It has the characteristics of compact structure, sensitive rotation and convenient maintenance. Where there is a bearing, there must be a support point. The inner support point of the bearing is the shaft, and the outer support is often called the bearing seat.
Crossed roller bearing is a special type of bearing with inner ring split and outer ring rotating. Because the divided inner ring or outer ring is fixed together with the cross roller collar after the roller and interval retainer are installed, so as to prevent separation, the operation is simple when installing the cross roller collar. Due to the cross arrangement of rollers, only one set of cross roller collar can bear the load in all directions. Compared with the traditional model, the rigidity is increased by 3 ~ 4 times. At the same time, because the inner ring or outer ring of the crossed roller bearing is divided into two parts, the bearing clearance can be adjusted, even if the preload is applied, the high-precision rotation motion can be obtained. Moreover, because of its special structure, it is commonly used as spherical plain bearing in industrial robots.
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