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Main bearing performance and various bearing applications

Main bearing performance and various bearing applications

2020-09-08

Deep groove ball bearing is simple in structure, easy to use, is the largest production batch, the most widely used type of bearing, mainly for bearing radial load, but also can bear a certain axial load.When the radial clearance of the bearing is increased, it has the function of angular contact ball bearing and can bear larger axial load.Compared with other bearings of the same size, this kind of bearing has low friction coefficient and high limit speed.This kind of bearing can bear pure axial load under the condition that thrust ball bearing is not suitable for high speed.

The self-aligning ball bearing has two rows of steel balls, the inner ring has two raceways, and the outer ring raceways are of inner spherical shape, with the performance of automatic self-aligning.It can automatically compensate the coaxiality error caused by the deflection of the shaft and the deformation of the shell, and it is suitable for the parts where the bearing hole cannot guarantee the strict coaxiality.

This kind of bearing is mainly used in agricultural machinery such as combine harvester, blower, paper mill, textile machinery, woodworking machinery, bridge crane wheel and transmission shaft.

Angular contact ball bearing with high limit speed can bear radial load and axial load at the same time, but also can bear pure axial load. Its axial load capacity is determined by contact Angle (the included Angle between load line and bearing radial plane), and increases with the increase of contact Angle.

This kind of bearing is suitable for double bearing shafts with small bearing spacing and good rigidity, such as machine tool spindle, especially grinding machine grinding wheel shaft, internal combustion engine hydraulic transmission, worm reducer, electric drill, centrifuge and supercharger, etc.

The roller of a cylindrical roller bearing is usually guided by the two edges of a bearing ring. The retainer, the roller and the guide ring constitute a combination that can be separated from another bearing ring. It belongs to a separable bearing.This kind of bearing is easy to install and disassemble, especially when the inner and outer rings are required to be fitted with the shaft and housing.This kind of bearing is generally only used to bear radial load, only the inner and outer rings of the single-row bearing with a side guard can bear a small directional axial load or a large clearance axial load.

Compared with the deep groove ball bearing with the same dimensions, this bearing has a larger radial load capacity.However, the machining requirements of shaft, shell hole and other related parts with this kind of bearing are higher.This kind of bearing is mainly used for large motor, machine spindle, lathe spindle, diesel engine crankshaft and gearbox of automobile and tractor, etc.

Self-aligning roller bearings have two rows of rollers, mainly used to withstand radial loads, but also can withstand axial loads in either direction.It has high radial load capacity, especially suitable for heavy load or vibration load, but cannot bear pure axial load.Good tuning performance, can compensate the coaxiality error.Mainly used for rolling mill.

Tapered roller bearings are mainly used to bear radial and axial combined loads, while large taper Angle tapered roller bearings can be used to bear radial and axial combined loads mainly. This kind of bearing is a separate type bearing, and its inner ring (including tapered roller and cage) and outer ring can be installed separately.The radial and axial clearance of the bearing can be adjusted during installation and use, and the preinterference can also be installed.This kind of bearing is mainly used in automobile rear axle wheel hub, large machine tool spindle, high power reducer, lathe axle box, roller of conveying device, as well as supporting roller and working roller of rolling mill.

Thrust ball bearing is a separable bearing, and the contact Angle of 90° can only bear axial load with low limit speed.Such bearings are commonly used in vertical drilling machines, vertical water pumps, lathe thimble seat, machine tool spindle, automobile clutch, worm reducer, jack, valve, rotary table of drilling machines, cranes and crane hooks and other machinery.

Thrust roller bearings mainly include four kinds of bearings, among which thrust self-aligning roller bearings are used to bear combined axial and radial loads mainly, but the radial load shall not exceed 55% of the axial load, and they have self-aligning performance.Thrust cylindrical roller bearing can only bear unidirectional axial load and slight impact. It can be used for unidirectional positioning and is suitable for low-speed situations.Thrust tapered roller bearing can only bear unidirectional axial load, which can limit the bearing unidirectional axial positioning. The limit speed is slightly higher than that of thrust cylindrical roller bearing.Thrust needle roller bearing can only bear axial load, which can limit the bearing one-way positioning.

Needle roller bearing is equipped with thin and long roller (roller length is 3 to 10 times of the diameter, diameter is generally no more than 5mm), so the radial structure is compact, its inner diameter size and load capacity is the same as other types of bearing, the outer diameter is the smallest, especially suitable for the radial installation size is limited by the supporting structure.According to suitable for different occasions, can be used without inner ring of the bearing or needle roller and cage components, at this time to suit the bearing surface of the surface of the shaft and the shell hole directly as inner and outer rolling bearing surface, in order to ensure the load capacity and operation performance and you have the same ring bearing, axis or shell hole hardness on the surface of the raceway, the machining accuracy and surface quality should be as a bearing ring raceway.

Such bearings are commonly used in universal joint shafts, hydraulic pumps, sheet mills, rock drills, machine tool gearboxes, automobile and tractor gearboxes, connecting rods and mechanical parts with swinging movement.

Linear ball bearings for a whole sleeve, the lining of several convex rib, after finishing as the raceway, contains three or more than three sets of loop, do loop rolling steel ball between outer ring and the shaft, linear motion ball bearings allow do straight line reciprocating movement along the axis, can bear radial load, radial clearance generally 0.009 to 0.012 mm, the friction coefficient of 0.002 to 0.003.


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