Are plain bearings grease lubricated?
Whether it is oil grease, need to first select the appropriate viscosity or consistency, viscosity is too large internal friction resistance increases, dynamic wear is also increased, so the friction heat is also increased, and accelerating the oil deterioration, above a certain temperature, will accelerate the fatigue wear. Once the viscosity is too small, the lubricant film is thin and the strength is not enough, only friction and wear, and even produce non fluid lubrication or dry friction, thereby damaging the machine.
Most of the general sliding bearing lubricated by lubricating oil, but the type of bearing and bearing seal in the open part, but also the use of sliding grease, most general rolling bearing grease, but when the speed is higher than 4 5m/s, or low temperature to increase the resistance and grease should not be too large, or need a large number of the whole unit and heat or liquid systems together, also need lubricating oil.
There are many kinds of sliding bearings, from lubrication methods can be divided into two types of hydrostatic lubrication and dynamic lubrication.Hydrostatic lubrication is to rely on lubrication is the system's oil pump pressure, so that the oil into the lubrication point. Due to the external pressure by the formation of oil wedge, oil film thickness, thus can produce or avoid starting impact of dry friction, wear a small (friction coefficient is 0.001), compared with the dynamic pressure bearing, can use slightly low viscosity lubricating oil.Dynamic pressure bearing is the rotation of the shaft, the use of lubricating oil to produce oil wedge force, the formation of fluid mechanics, dynamic oil film.
