The structure of plain bearing is simpler than that of rolling bearing. It is mainly composed of an inner ring with outer sphere and an outer ring with inner sphere. Articulated bearings are generally used for low-speed swing motion (i.e. angular motion). Because the sliding surface is spherical, it makes inclined motion (i.e. centering motion) within a certain angle range, and can still work normally when the non concentricity between the supporting shaft and the shaft shell hole is large.

Folding characteristics

The articulated bearing can bear large load. According to its different types and structures, it can bear radial load, axial load or combined load of radial and axial at the same time. Because the outer spherical surface of the inner ring is inlaid with composite materials, the bearing can produce self lubrication in operation. It is generally used for low-speed swing movement and low-speed rotation. It can also make inclined movement within a certain angle range. When the non concentricity between the supporting shaft and the shaft shell hole is large, it can still work normally. Self lubricating plain bearings are used in water conservancy, professional machinery and other industries.

application

Articulated bearings are widely used in engineering hydraulic cylinders, forging machine tools, engineering machinery, automation equipment, automobile shock absorbers, hydraulic machinery and other industries. Plain bearings are spherical plain bearings. The basic type is composed of inner and outer rings with spherical sliding spherical contact surfaces. According to its structure and type, it can bear radial load, axial load, or combined load acting both radially and axially.

Because the spherical sliding contact area and inclination angle of the joint bearing are large, and because most of the joint bearings adopt special process treatment methods, such as surface phosphating, galvanizing, chromium plating or outer sliding surface lining, insert pad, spraying, etc., they have large load capacity and impact resistance, and have corrosion resistance, wear resistance, self-aligning It has the characteristics of good lubrication or self lubrication without lubrication dirt pollution, and can work normally even if it is installed incorrectly. Therefore, articulated bearings are widely used in low-speed swing motion, tilt motion and rotary motion.

form

The plain bearing is mainly composed of an outer ring and an inner ring. The inner spherical surface of the outer ring and the outer spherical surface of the inner ring form a rolling friction pair.

Joint bearing performance

Because the structural form and working mechanism of articulated bearing are completely different from that of rolling bearing, articulated bearing has its own technical characteristics and maintenance requirements.

working temperature 

The allowable working temperature of the joint bearing is mainly determined by the matching materials between the sliding surfaces of the bearing, especially the plastic sliding surface of the self-lubricating joint bearing. Its bearing capacity will decline at high temperature. If the sliding surface material of lubricated plain bearing is steel / steel, the allowable working temperature depends on the allowable working temperature of lubricant. However, for all lubricated and self-lubricating spherical plain bearings, they can be used in the temperature range of - 30 ℃ ~ + 80 ℃ and maintain correct bearing capacity.

dip angle

The angle of inclination of the spherical plain bearing is much larger than that of the general adjustable rolling bearing, which is very suitable for use in the supporting parts with low concentricity requirements. The angle of inclination of the spherical plain bearing varies with the size, type, sealing device and support form of the bearing structure. The angle of inclination of the general centripetal spherical plain bearing is 3 ° ~ 15 °, and the angle of inclination of the angular contact spherical plain bearing is 2 ° ~ 3 °, The inclination range of thrust joint bearing is 6 ° ~ 9 °.

coordination

In any case, the matching selected by the joint bearing shall not cause uneven deformation of the ferrule, and the matching nature and grade must be determined according to the working conditions such as bearing type, support form and load.

Loading and unloading

The loading and unloading of plain bearings shall follow the following principle, that is, the force applied by assembly and disassembly cannot be directly transmitted through the spherical sliding surface. In addition, auxiliary loading and unloading tools, such as sleeves and disassemblers, shall be used to apply the loading and unloading force applied by the outside world directly and evenly to the matched ferrule, or no-load loading and unloading shall be carried out by auxiliary methods such as heating.

install

When assembling the plain bearing series, it is necessary to pay special attention to the position of the split surface of the outer ring. In order to avoid the load directly acting on the dividing surface, it is necessary to maintain the dividing surface at right angles to the conforming direction.

lubrication

When the applied load and the speed generated by swing motion are very small, the oil fed articulated bearing can be operated without lubrication. Nevertheless, it is generally necessary to supplement oil regularly. During the initial installation and operation, it is recommended that the lubrication cycle should be appropriately shortened.

Oil free plain bearings can be used without lubrication. However, if lithium soap based grease is added before operation, the service life of joint bearing can be extended. If grease is injected into the space around the bearing, the joint bearing will be more effective in preventing the invasion of dust and foreign matters.

Classification characteristics

Radial spherical plain bearing

(1) Ge... E type: single outer ring, no lubricating oil groove. It can bear small axial load and radial load in any direction.

(2) Ge... Es type: single seam outer ring with lubricating oil groove. It can bear radial load and small axial load in either direction.

(3) Ge... Es-2rs, geew... Es-2rs: single seam outer ring with lubricating oil groove and sealing rings on both sides. It can bear radial load and small axial load in either direction.

(4) Ge... ESN type: single seam outer ring, ge... Xsn type: double seam outer ring (split outer ring), with lubricating oil groove, and the outer ring has stop groove. It can bear radial load and small axial load in either direction. However, when the axial load is borne by the stop ring, its ability to bear the axial load is reduced.

(5) Ge... HS type: the inner ring has lubricating oil groove and double half outer ring. The clearance can be adjusted after wear. It can bear radial load and small axial load in either direction.

(6) Ge... DE1 type: the inner ring is hardened bearing steel and the outer ring is bearing steel. When the inner ring is assembled, it is extruded, with lubricating oil groove and oil hole. Bearings with inner diameter less than 15mm shall be free of lubricating oil groove and oil hole. It can bear radial load and small axial load in either direction.

(7) Ge... Dem1 type: the inner ring is hardened bearing steel and the outer ring is bearing steel. When the inner ring is assembled, it is extruded. After the bearing is installed into the bearing seat, the end groove is pressed out on the outer ring to fix the bearing axially. It can bear radial load and small axial load in either direction.

(8) Ge... DS type: the outer ring has assembly groove and lubrication groove. Limited to large bearings. It can bear radial load and small axial load in either direction (one side of the assembly groove cannot bear axial load).

Angular contact plain bearing

GAC... S-shaped inner and outer rings are hardened bearing steel, and the outer ring is provided with oil groove and oil hole. It can bear radial load and axial (combined) load in one direction.

Thrust joint bearing

GX... S-type shaft ring and seat ring are hardened bearing steel; The seat ring has oil grooves and oil holes. It can bear axial load or combined load in one direction (at this time, its radial load value shall not be greater than 0.5 times of the axial load value).

Rod end joint bearing

(1) Si... E type is the assembly of ge... E type bearing and rod end. The rod end is provided with internal thread, the material is carbon structural steel, and there is no lubricating oil groove. It can bear radial load and axial load less than or equal to 0.2 times radial load in any direction.

(2) Sa... E type is the assembly of ge... E type bearing and rod end. The rod end is provided with external thread, and the material is carbon structural steel; Without lubricating oil groove, it can bear radial load and axial load less than or equal to 0.2 times radial load in any direction.

(3) Si... Es type is the assembly of ge... Es type bearing and rod end. The rod end is provided with internal thread, and the material is carbon structural steel; There are lubricating oil grooves. It can bear radial load and axial load less than or equal to 0.2 times radial load in any direction.

(4) Sa... Es type is the assembly of ge... Es type bearing and rod end. The rod end is provided with external thread, and the material is carbon structural steel; There are lubricating oil grooves. It can bear radial load and axial load less than or equal to 0.2 times radial load in any direction.

(5) Sib... S-shaped rod end with internal thread, made of carbon structural steel; The inner ring is hardened bearing steel; There are lubricating oil grooves. It can bear radial load and axial load less than or equal to 0.2 times radial load in any direction.

(6) SAB... S-shaped rod end with external thread, made of carbon structural steel; The inner ring is hardened bearing steel; There are lubricating oil grooves. It can bear radial load and axial load less than or equal to 0.2 times radial load in any direction.

(7) SQ... Type is ball joint rod end joint bearing, and the rod end is carbon structural steel; The ball joint is carburized steel. It can bear radial load and small axial load in either direction.

Self lubricating spherical plain bearing

(1) Ge... C type and ge... T type: extrude the outer ring, and the sliding surface of the outer ring is sintered bronze composite; The inner ring is hardened bearing steel, and the sliding surface is plated with hard chromium. Limited to small size bearings. The outer ring is bearing steel, and the sliding surface is a layer of PTFE fabric. The inner ring is hardened bearing steel, and the sliding surface is plated with hard chromium. It can bear the load in the same direction. While bearing the radial load, it can bear the smaller axial load in any direction.

(2) Ge... Cs-2z type: the outer ring is bearing steel and the sliding surface is sintered bronze composite; The inner ring is hardened bearing steel, and the sliding surface is plated with hard chromium; Dust cover on both sides. It can bear the load in the same direction, and can bear the smaller axial load in any direction while bearing the radial load.

(3) Geew... T type: the outer ring is bearing steel, and the sliding surface is a layer of PTFE fabric; The inner ring is hardened bearing steel, and the sliding surface is plated with hard chromium. It can bear the load in the same direction. It can bear the radial load and the smaller axial load in any direction at the same time.

(4) Ge... F type: the outer ring is hardened bearing steel, the sliding surface is glass fiber reinforced plastic with PTFE as additive, the inner ring is hardened bearing steel, and the sliding surface is plated with hard chromium. It can bear medium radial load with constant direction.

(5) Ge... F2 type: the outer ring is glass fiber reinforced plastic, and the sliding surface is glass fiber reinforced plastic with PTFE as additive; The inner ring is hardened bearing steel, and the sliding surface is plated with hard chromium. It can bear medium radial load with constant direction.

(6) Ge... FSA type outer ring is medium carbon steel, and the sliding surface is composed of glass fiber reinforced plastic disc with PTFE as additive, which is fixed on the outer ring with a holder; The inner ring is hardened bearing steel. Used for large and extra large bearings. It can bear large radial load.

(7) Ge... FIH type outer ring is hardened bearing steel; The inner ring is medium carbon steel, and the sliding surface is composed of glass fiber reinforced plastic discs with polytetrafluoroethylene as additive, which are fixed on the inner ring with a retainer; Double half outer ring. Used for large and extra large bearings. It can bear large radial load.

Self lubricating angular contact spherical plain bearing

GAC... F-type outer ring is hardened bearing steel; The sliding surface is glass fiber reinforced plastic with polytetrafluoroethylene as additive; The inner ring is hardened bearing steel, and the sliding surface is plated with hard chromium. It can bear radial load and axial (combined) load in one direction.

Self lubricating thrust joint bearing

GX... F type seat ring is hardened bearing steel, the sliding surface is glass fiber reinforced plastic with PTFE as additive, the shaft ring is hardened bearing steel, and the sliding surface is plated with hard chromium. It can bear axial load or combined load in one direction (at this time, the radial load value shall not be greater than 0.5 times of the axial load value).

Self lubricating rod end plain bearing

(1) Si... C type is the assembly of Ce... C type bearing and rod end. The rod end has internal thread and is made of carbon structural steel. It can bear the load with constant direction. While bearing radial load, it can bear axial load less than or equal to 0.2 times radial load in any direction.

(2) Sa... C type is the assembly of Ce... C type bearing and rod end. The rod end is externally threaded and made of carbon structural steel. It can bear the load with constant direction. While bearing radial load, it can bear axial load less than or equal to 0.2 times radial load in any direction.

(3) Si... Cs-2z is the assembly of ge... Cs-2z bearing and rod end. The rod end has internal thread and is made of carbon structural steel. While bearing radial load, it can bear axial load less than or equal to 0.2 times radial load in any direction.

(4) Sa... Cs-2z is the assembly of ge... Cs-2z bearing and rod end. The rod end is externally threaded and made of carbon structural steel. It can bear the load with constant direction. While bearing radial load, it can bear axial load less than or equal to 0.2 times radial load in any direction.

(5) Sib... C-shaped rod end is provided with internal thread, the material is carbon structural steel, and the sliding surface is sintered bronze composite; The inner ring is hardened bearing steel, and the sliding surface is plated with hard chromium. It can bear radial load with constant direction.

(6) SAB... C-shaped rod end is provided with external thread, the material is carbon structural steel, and the sliding surface is sintered bronze composite; The inner ring is hardened bearing steel, and the sliding surface is plated with hard chromium. It can bear radial load with constant direction.

(7) Sib... F-shaped rod end is provided with internal thread, the material is carbon structural steel, and the sliding surface is glass fiber reinforced plastic with PTFE as additive; The inner ring is hardened bearing steel, and the sliding surface is plated with hard chromium. It can bear radial load with constant direction.

(8) SAB... F-shaped rod end is provided with external thread, the material is carbon structural steel, and the sliding surface is glass fiber reinforced plastic with PTFE as additive; The inner ring is hardened bearing steel, and the sliding surface is plated with hard chromium. It can bear radial load with constant direction.

(9) SQ... L type is made of special self-lubricating alloy material, which can bear radial load and small axial load in either direction.