Rolling bearing is the operation of the shaft and the shaft between the sliding friction into a rolling friction, thereby reducing the friction loss of a sophisticated mechanical components. Rolling bearings generally by the inner ring, outer ring, rolling body and cage composed of four parts, the role of the inner ring is matched with the shaft and with the shaft rotation; outer ring role is with the bearing seat to play a supporting role; In the cage evenly distributed between the inner ring and the outer ring, its shape size and quantity directly affect the use of rolling bearings performance and life; cage can make the rolling element evenly distributed to prevent the rolling off, guide the rolling body Rotation acts as a lubricant.

First, the characteristics of rolling bearings

 

specialization

 

 

 

Bearing parts processing, a large number of bearing special equipment. Such as ball processing using grinding machine, grinding machines and other equipment. Specialized features are also reflected in the production of bearing parts, such as the professional production of steel ball company, specializing in the production of micro-bearing miniature bearing factory.

 

Advanced nature

 

Due to the large volume requirements of bearing production, making it possible to use advanced machine tools, tooling and processes. Such as CNC machine tools, three-jaw floating chuck and protective atmosphere heat treatment.

 

automation

 

The specialization of bearing production provides the conditions for its production automation. In the production of a large number of fully automatic, semi-automatic and non-dedicated machine tools, and the production of automatic line to promote the application. Such as heat treatment automatic lines and assembly lines.

Second, by type of structure classification

Rolling bearings can be divided into: deep groove ball bearings, needle roller bearings, angular contact bearings, aligning ball bearings, spherical roller bearings, thrust ball bearings, thrust spherical roller bearings, cylindrical roller bearings, tapered roller Bearings, with spherical ball bearings and so on.

1, deep groove ball bearings

Deep groove ball bearings simple structure, easy to use, is the largest production volume, the most widely used a class of bearings. It is mainly used to bear a radial load, but also can withstand a certain axial load. When the radial clearance of the bearing increases, with angular contact bearing function, can withstand a larger axial load. Used in automobiless, tractors, machine tools, motors, pumps, agricultural machinery, textile machinery.

 

2, needle roller bearings

 

Needle roller bearings with fine and long roller (roller length of 3 to 10 times the diameter of the diameter is generally not more than 5mm), so the radial structure is compact, its inner diameter and load capacity and other types of bearings, The diameter is minimal, especially for radial mounting dimensions with restricted support structures. According to the use of different occasions, can be used without the inner ring bearing or needle roller and cage components, and the bearing at this time with the journal surface and the shell hole surface directly as the bearing inside the outer rolling surface, in order to maintain the load capacity and operating performance As with ferrule bearings, the hardness of the shaft or shell hole raceway surface. The machining accuracy and surface and surface quality should be similar to those of the bearing ring raceway. Such bearings can only withstand radial loads. For example: universal joint shaft, hydraulic pump, sheet mill, rock drill, machine gear box, car and tractor machine gearbox.

 

 

3, angular contact bearings

Angular contact ball bearing limit speed is high, can withstand both the load and axial load, can also bear the pure axial load, the axial load capacity determined by the contact angle, and with the contact angle increases. Used for: pumps, air compressors, various types of transmission, fuel injection pump, printing machinery.

 

4, aligning ball bearings

Self-aligning ball bearings have two rows of ball, the inner ring has two raceways, outer ring raceway for the spherical shape, with automatic self-aligning performance. Can automatically compensate for the shaft winding and shell deformation caused by the coaxial error, applicable to the bearing seat can not guarantee the rigidity of the coaxial parts. The bearing is mainly subjected to radial load, while undergoing radial loads, it can also withstand a small amount of axial load, usually not used to bear the pure axial load, such as to withstand the pure axial load, only one column of steel force. Mainly used in combine harvesters and other agricultural machinery, blowers, paper machines, textile machinery, woodworking machinery, bridge crane wheel and drive shaft.

 

5, aligning roller bearings

Spherical roller bearing with two rows of rollers, mainly used to withstand radial load, but also can withstand any direction of the axial load. The bearing has a high radial load capacity, especially for heavy duty or vibration load work, but can not withstand pure axial load; good self-aligning performance, can compensate for the same bearing error. Main purposes: paper machinery, slowdown devices, railway vehicle axles, rolling mill gear box, crusher, all kinds of industrial reducer and so on.

 

 

6, thrust ball bearings

Thrust ball bearings are a separate bearing, shaft ring "seat ring and the cage" ball components can be separated. Shaft ring is a ring with the shaft, the ring is matched with the bearing hole, and there is a gap between the shaft. Thrust ball bearings can only draw axial load, one-way thrust ball bearings can only withstand the axial load of a room, two-way thrust ball bearings can withstand axial load in both directions. Thrust balls can not limit the movement of the shaft to the shift, the limit speed is very low. The one-way thrust ball bearings can limit the axial displacement of the shaft and the housing in one direction, and the two-way bearing can limit the axial displacement in both directions. Mainly used in automotive steering mechanism, machine tool spindle.

 

7, thrust roller bearings

Thrust roller bearings are used to withstand shafts with axial loads, but the warp load can not exceed 55% of the axial load. Compared with other thrust roller bearings, this bearing friction factor is low, high speed, and has a self-aligning ability. 29000 type bearing roller is asymmetrical spherical roller, can reduce the stick and race in the work of the relative sliding, and the roller length. Large diameter, the number of roller multi-load capacity, usually using oil lubrication, individual Low-speed conditions can be lubricated with grease. In the design selection, should be preferred. Mainly used in hydro-generators, crane hooks, and so on.

 

 

8, cylindrical roller bearings

Cylindrical roller bearings are usually guided by two ribs of a bearing collar, and the cage and guide ferrule form an assembly that separates from another bearing ring and is a separable bearing. This kind of bearing installation, disassembly more convenient, especially when required inside the outer ring and shaft. Shell is the interference with the more display when the advantages. This type of bearing is generally only used to bear the radial load, only the outer ring with a single row of bearings can withstand a small constant axial load or a larger intermittent axial load. Mainly used for large motors, machine tool spindle, axle axle box, diesel engine crankshaft and car, care to keep in mind the box and so on.

 

 

9, tapered roller bearings

Tapered roller bearings are mainly suitable for radial and axial load bearing radial load, and large cone angle tapered roller bearings can be used to bear the axial load-based diameter, axial joint load. This type of bearing is a separate bearing, its inner ring (including tapered roller and cage) and the outer ring can be installed separately. In the installation and use of the process can be adjusted bearing the meridional clearance and axial clearance, can also be pre-installed for automotive rear axle hub, large machine tool spindle, high power reducer, axle bearing box, conveyor wheel The

 

10, with a seat spherical ball bearings

 

The spherical ball bearings are made of double-sided sealed spherical ball bearings and cast (or steel stamping) bearing housings. The inner structure of the spherical ball bearing is the same as that of the deep groove ball bearing, but the inner ring of the bearing is wider than the outer ring. The outer ring has a spherical outer surface and can be self-aligning with the concave spherical surface of the bearing seat. Usually between the bearing hole and the shaft between the gap, with the top wire, eccentric sleeve or adapter sleeve bearing inner ring fixed on the shaft, and with the axis of rotation. Belt bearing compact structure, easy loading and unloading, sealed, suitable for simple support, commonly used in mining. Metallurgy. Agriculture. Chemical. Textile. Printing and dyeing.