What are the consequences of not hammer sliding bearing
Tapered roller bearings, spherical roller bearings and thrust roller bearings, because at the same time subjected to radial and axial load, so in the same temperature, the ratio of ball and cylindrical roller bearings with high viscosity lubricating oil {TodayHot}. At constant speed, under the condition of normal temperature, tapered roller bearings and spherical roller bearings, oil viscosity is the lowest limit for the mechanical oil viscosity of AN32 - L. Spherical roller thrust bearings oil viscosity is the lowest limit for the mechanical oil viscosity of AN46 - L.Because of the larger sliding friction, the needle roller bearings need more effective lubrication, so the viscosity level of the oil is usually lower than that of the ball bearings of the same specification and speed.For plain bearings, the viscosity of the oil is related to the journal diameter, the rotation speed of the shaft, and the magnitude of the load per unit area.
For rolling bearings, both the internal friction and sliding friction, in the case of high-speed rotation, such as poor lubrication, there will be wear, heating, burns, until all damage. If the oil viscosity is too low, when the bearing pressure is large, it is easy to cause fracture of lubricating oil film, caused by dry friction and increased wear; the oil viscosity is too large, the frictional resistance will increase the bearing, so that the temperature, stress will affect the flow of oil, it is difficult to form oil film, instead of bearing harmful therefore, the rolling bearing lubricating oil viscosity selection is particularly important.Ball and roller bearing with mechanical oil, in low and normal temperature conditions, the general choice of L - AN22, L - AN32, L - AN46 viscosity grade lubricating oil, lubricating oil, high speed, large diameter bearings can be selected at a low viscosity and a high selection of lubricating oil the viscosity of.
The range of viscosity selection is L - ANl5 to L - AN68. High speed, big journal diameter bearings, oil viscosity can be lower, and conversely, oil viscosity should be a little higher.For machine tools, the sliding rails in general working conditions should be lubricated by mechanical oil. The viscosity of the oil shall be determined according to the magnitude, speed, horizontal or vertical temperature of the rail. Horizontal guideway should choose L - AN32 ~ L - AN68 viscosity of lubricating oil, and vertical guide rail should choose L - AN46 ~ L - ANl00 viscosity of lubricating oil.For gear transmission, the actual contact stress between the teeth are often very high, with each point on the tooth surface and the short time, but also engaged in sliding and rolling at the same time, therefore, the formation of liquid film is weak. The lubrication of gears depends mainly on the boundary oil film. The greater the gear load, the higher the viscosity of the selected oil; the higher the speed, the lower the viscosity of the selected oil; the higher the working environment temperature, the higher the viscosity of the selected oil. Under normal circumstances, the gear drive using L - AN46 viscosity of mechanical oil can meet the requirements.
