Rod end joint bearing is a kind of joint bearing with rod end or installed at rod end. It belongs to a kind of joint bearing.
Chinese name rod end joint bearing foreign name rod end joint bearing applicable field joint bearing concept joint bearing with rod end or installed on rod end
Plain bearings are spherical plain bearings. The basic type is composed of inner and outer rings with spherical sliding spherical contact surfaces. The inner and outer ring of the bearing are mainly composed of a spherical surface, which can bear a 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 swinging motion with low speed, and can also make tilting motion within a certain angle range. When the non concentricity between the support shaft and the shaft shell hole is large, it can still work normally. Self lubricating joint auxiliary bearing is used in water conservancy, professional machinery and other industries. Because the spherical sliding contact area of the joint bearing is large and the inclination angle is large, but also because most joint bearings adopt special process treatment methods, such as surface phosphating, galvanizing, chromium plating or outer sliding surface lining, pad inlay, spraying, etc. Therefore, it has great load capacity and impact resistance, and has the characteristics of corrosion resistance, wear resistance, self-aligning, good lubrication or self-lubrication without lubricating dirt pollution. It 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.
Spherical plain bearings and rod end plain bearings have various designs and different combinations of sliding contact surfaces. Each design and combination has unique performance, which makes it especially suitable for some applications.
Radial spherical plain bearing to be maintained
Maintenance free spherical plain bearing
Angular contact spherical plain bearing
Spherical sliding thrust bearing
Rod end joint bearing
To select a certain bearing type and determine the required bearing size, the main factors that must be considered are load, bearing load capacity and expected service life. The same is true when selecting rod end plain bearings.
According to the GB / t9161 standard, its type can be divided into: bent rod split ball joint rod end joint bearing (type code: SQ); Straight rod split ball joint rod end joint bearing (type code: SQZ); Single rod split ball joint rod end joint bearing (type code: SQD); Assembled rod end plain bearing with left-hand internal thread (type code: sllb); Assembled rod end plain bearing with left-hand external thread (type code: salb); Left hand bending rod type rod end plain bearing (type code: sllb); Left hand single rod type rod end joint bearing (type code: sqld); With cylindrical welded rod end joint bearing (cylindrical) (type code: SK); Welded rod end plain bearing with flat base (square) (type code: SF); Rod end plain bearing with locking slot (type code: SLR).
By size series
Rod end joint bearing eh series (reinforced type); Rod end joint bearing eg series (reinforced type); Normal series of inch size rod end plain bearing (size series code is Z); Rod end plain bearing JK series (dimension series code is JK). Its structural material code and clearance group code are like plain bearings.
Rod end joint bearings are mainly used for supporting parts with low concentricity requirements, high working surface pressure and slow swing and rotation.
Internal thread series
Refer to GB / t304,1-2002, GB / t304,2-2002, GB / t304,3-21102 and GB / 12765-1991 for details of rod end plain bearings. The rod end joint bearing belongs to sliding bearing, which has wear-resistant non-metallic material lubrication type and oil passage lubrication type.
Similar to ge20-et and ge15-et, they are all plain bearings, and the suffix is the specific type.
Plain bearings are divided into Ge, GEC, GEG, geew, gek, GEH and other types, with different sizes and lubrication methods, which can be found in the sliding bearing classification in the mechanical design manual.
In a narrow sense, the rod end joint bearing should refer to the commonly referred to fisheye joint.
External thread series
According to the internal and external threads of the connection mode, the fisheye joint is divided into: internal thread series SIG and external thread series sag The size of the inner and outer wires is the same as the inner diameter of the fisheye. For example, the inner diameter of the bearing is also D12 for the fisheye joint with M12 joint
Articulated bearings are widely used in engineering hydraulic cylinders, forging machine tools, engineering machinery, automation equipment, automobile shock absorbers, hydraulic machinery and other industries.
Introduction, editing and broadcasting of rod end joint bearing
The vibration of the rod end joint bearing is very sensitive to the damage of the rod end joint bearing, such as peeling, indentation, corrosion, crack, wear, etc. will be reflected in the vibration measurement of the rod end joint bearing. Therefore, the vibration can be measured by using a special rod end joint bearing vibration meter (frequency analyzer, etc.), and the specific abnormal situation can not be inferred by frequency division. The measured values are different due to the service conditions of the rod end joint bearing or the installation position of the sensor. Therefore, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.
The temperature of the rod end joint bearing can generally be inferred from the temperature outside the rod end joint bearing chamber. It is more appropriate if the outer ring temperature of the rod end joint bearing can be directly measured by using the oil hole. Generally, the temperature of the rod end joint bearing starts to rise slowly with the operation of the rod end joint bearing, and reaches a stable state after 1-2 hours. The normal temperature of rod end joint bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are appropriate, the temperature of the joint bearing at the rod end will rise sharply, resulting in abnormal high temperature. At this time, the operation must be stopped and necessary preventive measures must be taken. Using the thermal sensor, the working temperature of the rod end joint bearing can be monitored at any time, and the automatic alarm or stop when the temperature exceeds the specified value can be realized to prevent the occurrence of combustion shaft accident.
Installation and removal
1. Where the press is missing or cannot be used, the end rod joint bearing can be installed with assembly sleeve and small hammer. The hammering force shall be evenly transmitted to the whole circumference of the end face of the end rod joint bearing ring. Therefore, the hammered end face of the assembly sleeve shall be made into a sphere.
2. The force required to install the end rod joint bearing is related to the size of the joint bearing and the fit interference. For medium-sized or large-scale joint bearings with large interference, the method of hot assembly is often used. Before hot assembly, put the end rod joint bearing or separable joint bearing ring into the oil tank or special heater and heat it evenly to 80-100 ℃, not more than 100 ℃.
3. Hot fitting of spherical plain bearings requires skilled operation skills. When the joint bearing is removed from the heating oil tank or heater, immediately wipe off the oil stains and attachments on the surface of the joint bearing with a clean cloth (pay attention not to use cotton yarn), then put it in front of the mating surface, and push the joint bearing to the place against the shaft shoulder in one operation. Always push tight during cooling, or gently tap the plain bearing with a small hammer through the assembly sleeve to make it close. When installing the end rod joint bearing, rotate the joint bearing slightly to avoid toppling or jamming.
4. When the outer ring of the end rod joint bearing is tightly matched with the shell hole, the shell can also be heated and installed into the joint bearing. In particular, the joint bearing made of light metal materials may damage the mating surface due to the pressing in of its outer ring during the tight fitting process. In this case, the end rod joint bearing should be heated first.
There are several kinds of common rod end joint bearing maintenance
Regular maintenance: in order to ensure the normal operation of the main engine, set a maintenance cycle for regular maintenance according to the requirements of the main engine and the design theory and application experience of the bearing.
Fault repair: stop the machine for inspection and repair in case of bearing fault.
Early warning maintenance: apply advanced bearing fault diagnosis technology to stop real-time monitoring of the application status of the bearing, put forward a notice before the bearing fault occurs, and stop maintenance.
During the operation of the bearing, there must be sound, temperature and vibration. Therefore, for the maintenance of the running bearing, we can find the abnormal changes of the bearing by listening, touching, observing and using the bearing fault diagnosis instrument, and judge whether the rod end joint bearing is in the normal working state according to the changed state.