There are many reasons for the loss of combined needle roller bearing. All the influencing factors in the design and manufacturing process will be related to the loss of combined needle roller bearing, which is difficult to judge by analysis. However, in general, it can be considered and analyzed from two aspects: use factors and internal factors.Internal lubrication Technology to Solve Bearing Heating
Internal lubrication Technology to Solve Bearing Heating
The use factors of the loss combined needle roller bearing mainly refer to whether the installation, adjustment, use and maintenance, maintenance and repair meet the technical requirements. The installation condition is one of the primary factors in the use factors.
The improper installation of the combined needle roller bearing often leads to the change of the stress state between the parts of the whole set of combined needle roller bearing, and the combined needle roller bearing operates and loses in an abnormal state. Internal lubrication Technology to Solve Bearing Heating
According to the technical requirements for the installation, use, maintenance and repair of the combined needle roller bearing, the load, rotating speed, working temperature, vibration, noise and lubrication conditions of the combined needle roller bearing in operation are monitored and checked.
If any abnormality is found, find out the cause immediately and adjust it to make it return to normal. In addition, it is also important to analyze and test the quality of grease and the surrounding medium and atmosphere.Internal lubrication Technology to Solve Bearing Heating
Grease lubricated grease has both sealing function and simple sealing structure and lubrication facilities. It is convenient to supplement grease. Therefore, as long as the working conditions permit, the combined needle roller bearing is generally lubricated with grease.Internal lubrication Technology to Solve Bearing Heating
Oil lubrication has strong cooling effect and can take away dirt and moisture from the combined needle roller bearing. The lubrication methods of combined needle roller bearing with oil lubrication include pressure oil supply lubrication, oil injection lubrication, oil mist lubrication and oil-gas lubrication.
Pressure oil supply lubrication is an effective lubrication method of combined needle roller bearing at conventional speed. Internal lubrication Technology to Solve Bearing Heating
Fuel injection lubrication is to inject lubricating oil into the bearing through the fuel injection nozzle installed on one side of the combined needle roller bearing at a certain pressure for lubrication. It is generally used in high-speed combined needle roller bearing, or where the pressure oil supply lubrication cannot meet the cooling requirements.
Spray lubrication is to spray dry compressed air containing oil mist into the inner part of the needle roller bearing to lubricate, use less oil, and because of the effect of air, the cooling effect is very strong.
Both pressure oil supply lubrication and oil injection lubrication need to be equipped with oil inlet and outlet pipes, lubrication pumps, oil reservoirs, and sometimes lubricating oil coolers. Therefore, the cost is high, and generally combined needle roller bearings are rarely used.Internal lubrication Technology to Solve Bearing Heating
These are two different grades of lubricants, which are used in a wide temperature range in GB 7631.2-87. These two kinds of oils have low pour point, excellent wear resistance, low-temperature fluidity and low-temperature pumping.
HV and HS lubricants can be divided into mineral oil type and synthetic oil type according to the base oil, according to 40. C kinematic viscosity, H V oil is divided into six grades: 15, 22, 32, 46, 68 and 100, and HS oil is divided into four grades: 15, 32, 32 and 46.Internal lubrication Technology to Solve Bearing Heating
H Ⅴ low temperature lubricant is mainly used for medium or high pressure hydraulic systems of construction machinery, imported equipment and vehicles in cold areas or with large temperature variation range and harsh working conditions.
Such as CNC machine tools, cable well pumps And ship cranes, excavators, large cranes and other hydraulic systems. The service temperature is above 30’c.Internal lubrication Technology to Solve Bearing Heating
HS low temperature lubricant is mainly used for the above equipment in severe cold areas. The service temperature is – 30. Below C.
Good extreme pressure and wear resistance.
Excellent low-temperature performance and low pour point can ensure the easy start-up and normal operation of construction machinery or equipment in cold or severe cold environment.
Excellent viscosity temperature performance and viscosity index above 130 ensure good lubrication, cooling and sealing of hydraulic equipment under the condition of large temperature change.
Good demulsibility and rust resistance.
Good oxidation stability, hydrolysis stability and thermal stability.
Low temperature lubricant is an advanced lubricant with both anti-wear and high and low temperature properties, which should be used reasonably.
Low temperature lubricants cannot be used in hydraulic equipment with silver parts.
HV oil and HS oil cannot be mixed because of the different composition of base oil, so as not to affect the service performance. Other precautions are the same as HM lubricant.