The accuracy of the bearing mainly includes two aspects, one is the dimensional accuracy, the other is the rotation accuracy. The former is the bearing after the installation of the required items. And the rotation accuracy is defined as the rotation of the vibration, including the inner and outer ring radial, axial swing, the inner side of the hem and the radius of the vertical tolerance range.
The accuracy of the bearing level from the ordinary 0 to 6, 5, 4 and 2, followed by increased. China's bearing standard is GB307 regulations.
Tapered roller bearings are a separate type of bearing, the structure of this bearing is mainly inside and outside the circle has a conical raceway. It has three different types of structures, namely: according to the number of roller columns are divided into single row tapered roller bearings, double row tapered roller bearings and tapered tapered roller bearings.
Tapered roller bearings are mainly used to withstand the radial diameter of the main, axial joint load. The angle of the raceway of the outer ring will directly affect the bearing capacity of the bearing. The larger the roller race angle of the outer ring, the greater the bearing capacity of the bearing. Single row tapered roller bearing clearance requires the user to adjust the time in the installation, double row and four row of tapered roller bearing clearance is the beginning of the factory in accordance with the requirements of the customer given, do not need to adjust the user.
The tapered roller bearing is of the type of separation, mainly because it consists of a roller and a cage assembly of the inner ring. In many areas of industrial life have a very good performance, the most commonly used areas are: cars, rolling mills, metallurgy, mining and plastic machinery and so on.
Thrust roller bearings are bearings in a more common bearing, the application is very wide.
So, in the use of the process, should pay attention to what?
First of all, look at the thrust roller bearing room tolerance selection and control:
1, thrust roller bearings into the thrust roller bearings should be flexible after the rotation without blocking sense. If there is a clear rotation is not flexible, then the size of the shaft is too large, the tolerance to be reduced. Such as thrust roller bearings into the shaft after the hand by hand there is a clear "rust" feeling, it may be too much tolerance of the shaft or shaft roundness is not good. So in the control of shaft and thrust roller bearing room tolerance to control the roundness, the current domestic manufacturers only to control the tolerance, there is no control of the roundness.
2, thrust roller bearing assembly: Because the thrust roller bearings are high-precision products, such as improper assembly is easy to cause damage to the thrust roller bearing channel, resulting in damage to the thrust roller bearings. Thrust roller bearings in the assembly should have a dedicated mold, can not be tapping, in the press into the shaft when only a small circle of force, pressure circle can only large circle force. Assembly requirements of the use of air pressure or hydraulic pressure in the upper and lower mold to be outside the horizontal state, if the tilt will lead to thrust roller bearing groove due to damage to the force, leaving the thrust roller bearing guide.
3, the installation of foreign body to prevent: thrust roller bearings in the load on the rotor to do when the dynamic balance is easy to balance the iron into the thrust roller bearings into the internal, so it is best to install thrust roller bearings before the dynamic balance The There are some manufacturers in order to facilitate the assembly, the assembly in the thrust roller bearing room coated with some oil or grease from the lubrication effect, but often the operator is difficult to control the amount of good, if the oil or grease in the thrust roller bearing room accumulated more , It is easy to enter the thrust roller bearing along the shaft when the thrust roller bearing is rotated. Thrust roller bearing room is best not to oil or grease, if not coated can not be controlled in the thrust roller bearing room can not stay.
4, the prevention of paint rust: paint rust is characterized by multiple in the sealed motor, the motor sound in the assembly is very good, but put some time in the warehouse, the motor varies greatly, remove the thrust roll Sub-bearing a serious rust phenomenon. Many manufacturers will think that before the thrust roller bearing the problem, through our continuous publicity, and now the motor factory has been aware of the problem is mainly insulating paint. The problem is mainly due to the insulating material of the acidic material in a certain temperature, humidity, the formation of corrosive substances, the thrust roller bearing channel corrosion caused by thrust roller bearings damaged. The problem is currently only a good choice of insulating paint, and after the ventilation in a period of time after the assembly. Thrust roller bearings in the use of the process, the most important is the length of life. The length of life and bearing manufa。