Chinese name
rod end joint bearing
Foreign name
rod end joint bearing
Applicable field
Joint bearing
concept
Joint bearing with or mounted on rod end
Product introduction type According to the size series, the rod end joint bearing is introduced, and the installation, disassembly and maintenance are introduced, which is called TA.
Product introduction
The joint bearing is a spherical sliding bearing, and the basic type is composed of an inner ring and an outer ring, and the inner ring and the outer ring have spherical sliding spherical contact surfaces. The joint bearing is mainly composed of the inner ring of the outer spherical surface and the outer ring of the inner spherical surface, which can bear a large load. According to its different types and structures, it can bear radial load, axial load or a combination of radial and axial load. Because the outer spherical surface of the inner ring is inlaid with composite materials, the bearing can produce self-lubrication in work. Generally used for low-speed swing movement, but also for tilting movement within a certain angle range. When the bearing shaft is not concentric with the shaft sleeve hole, it can still work normally. Self-lubricating joint bearings are used in water conservancy, professional machinery and other industries. Because of the large sliding contact area and large inclination angle of spherical surface of joint bearings, most joint bearings adopt special processing methods, such as surface phosphating, zinc plating, chromium plating or external sliding surface lining, pad and spraying. Therefore, it has great bearing capacity and impact resistance, and has the characteristics of corrosion resistance, wear resistance, self-aligning, good lubricity or self-lubrication, and no lubricating dirt pollution, and can work normally even if it is installed incorrectly. Therefore, joint bearings are widely used in low-speed swinging motion, tilting motion and rotating motion.
rod end joint bearing
Spherical sliding bearing and rod end joint bearing have many designs and different sliding contact surface combinations. Each design and combination has unique performance, which makes it particularly suitable for some applications.
type
Radial spherical sliding bearing in need of maintenance
Maintenance-free spherical sliding bearing
Angular contact spherical sliding bearing
Spherical sliding thrust bearing
rod end joint bearing
The main factors that must be considered in selecting bearing type and determining the required bearing size are load, bearing load capacity and expected service life. The same is true when selecting rod end joint bearings.
According to GB/T9 16 1 standard, its types can be divided into: joint bearing at rod end of bent rod tee (type code: SQ); Straight bar tee bearing (model code: SQZ); Single-rod tee bearing (model code: SQD); Left-handed internal thread assembled rod end joint bearing (model code: SLLB); Left-handed external thread assembled rod end joint bearing (model code: SALB); Left-hand bending rod end joint bearing (model code: SLLB); Left-handed single-rod joint bearing (model code: SQLD); Cylindrical welded rod end joint bearing (cylindrical) (model code: SK); Flat welded rod end joint bearing (square) (model code: SF); Rod end joint bearing with locking mouth (model code: SLR).
Series by size
Rod end joint bearing EH series (reinforced type); Rod end joint bearing EG series (reinforced type); British standard series rod end joint bearing (dimension series code Z); Rod end joint bearing JK series (dimension series code JK). Its structural material code and clearance group code are the same as those of the joint bearing.
Rod-end joint bearings are mainly used to support parts with low concentricity requirements, high working face pressure and slow swing and rotation movement.
For details about rod end joint bearings, please refer to GB/T304, 1-2002, GB/T304, 2-2002, GB/T304, 3-2102, GB/12765. Rod-end joint bearings belong to sliding bearings, including wear-resistant nonmetallic material lubrication type and oil groove lubrication type.
Internal thread series
Similar to GE20-ET, GE 15-ET, etc. It is a joint bearing, and the suffix is a specific type.
Joint bearings are divided into GE, GEC, GEG, GEW, GEK, GEH and other types, with different sizes and different lubrication methods. See the classification of sliding bearings in the mechanical design manual for details.
The narrow sense of rod end joint bearing should refer to the so-called fisheye joint.
According to the connection mode, the difference between internal thread and external thread of fisheye joint is: internal thread series SIG and external thread series SAG. The dimensions of internal and external threads are the same as the inner diameter of fisheye joint, for example, the joint is M 12 and the bearing inner diameter is D 12.
External thread series
Joint bearings are widely used in engineering hydraulic cylinders, forging presses, engineering machinery, automation equipment, automobile shock absorbers, water conservancy machinery and other industries.
Introduction of rod end joint bearing
The vibration of rod-end joint bearing is very sensitive to the damage of rod-end joint bearing, such as peeling, indentation, corrosion, crack and wear. This will be reflected in the vibration measurement of the rod end joint bearing. Therefore, vibration can be measured by using special vibration measuring instruments (frequency analyzer, etc.). ), and the specific situation of anomalies cannot be inferred by frequency analysis. The measured values are different because of the different use conditions of the rod-end joint bearing or the installation position of the sensor. It is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.
Generally, the temperature of the rod end joint bearing can be inferred from the temperature outside the rod end joint bearing chamber. It would be more appropriate if the oil hole could be used to directly measure the temperature of the outer ring of the rod end joint bearing. Usually, the temperature of the rod-end joint bearing rises slowly with the operation of the rod-end joint bearing, and reaches a stable state after 1-2 hours. The normal temperature of the 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 rod end joint bearing will rise sharply, resulting in abnormal high temperature. At this time, it is necessary to stop running and take necessary preventive measures. Using thermal sensor, the working temperature of rod end joint bearing can be monitored at any time, and when the temperature exceeds the specified value, it can automatically alarm or stop to prevent shaft burning accident.
***5 sheets
Atlas of rod end joint bearings
Installation and disassembly
1. Where there is no press or it can't be used, you can install the end rod joint bearing with the assembly kit and small hammer. The hammering force should be evenly transmitted to the whole circumference of the end face of the end rod joint bearing ring, so the hammering end face of the assembly sleeve should be spherical.
2. The force required to install the end rod joint bearing is related to the size and fit interference of the joint bearing. For medium-sized or large-sized joint bearings with large interference, the hot-fitting method is generally adopted. Before hot-fitting, put the end rod joint bearing or separable joint bearing ring into the oil tank or special heater, and uniformly heat it to 80- 100℃, and do not exceed 100℃.
3. Hot-fitting joint bearings require skilled operation skills. When the joint bearing is taken out of 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 (be careful not to use cotton yarn), then put it in front of the mating surface, and push the joint bearing against the shaft shoulder in one operation. During the cooling process, be sure to push it tightly, or tap the joint bearing gently through the assembly sleeve with a small hammer to close it. When installing the end rod joint bearing, the joint bearing should be rotated slightly to avoid falling or getting stuck during installation.
4. When the outer ring of the end rod joint bearing is closely matched with the hole of the shell, the shell can also be heated and put into the joint bearing. Especially in the process of tight fit, the joint bearing made of light metal material may damage the mating surface because of the press-in of its outer ring. In this case, the end rod joint bearing should be heated first.
repair
There are several common maintenance types of rod end joint bearings.
Regular maintenance: in order to ensure the normal operation of the main engine, according to the requirements of the main engine and the design theory and experience of bearings, a maintenance cycle is set for regular maintenance.
Fault maintenance: when the bearing fails, stop the machine for inspection and maintenance.
Early warning maintenance: adopt advanced bearing fault diagnosis technology, stop real-time monitoring of bearing running state, give a warning before bearing fault occurs and stop maintenance.
In the process of bearing operation, there will inevitably be phenomena such as sound, temperature and vibration. Therefore, by listening, touching, observing and using the bearing fault diagnosis instrument, we can find the abnormal change of the bearing, and judge whether the rod end joint bearing is in normal working state according to the changed state.
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