The role of bearing cooperation and selection skills

The function of the bearing fit is to consolidate the stationary and rotating rings of the bearing with the stationary part (usually the bearing seat) and the rotating part (usually the shaft) of the mounting part, thereby realizing the transfer of the load and the defined movement in the rotating state. The basic task of the system relative to the position of the stationary system. On the shaft and in the housing, the rolling bearing requires its position to be fixed in three directions: radial, axial and tangential directions. The radial and tangential positioning is achieved by the tight fit of the bearing ring. The axial positioning is only used in a few cases. The axial position is generally limited by axial limit parts such as end caps and retaining rings. Within the clearance range.

Bearings are important accessories in machinery. They can also be said to be mechanical joints. Like our humans, if there is no joint, it will not work. If people have no joints, then what is the role? Then there is no use, the machine is the same, without the bearing, the machine can not be used, so the machine is inseparable from the bearing, leaving the bearing can not survive, it is equivalent to waste. The use of bearings is very complicated. Some rolling bearings need to be used together. This general technician knows the knowledge that we generally don't know. We will introduce the use and requirements of this rolling bearing. Also know the basis of your familiarity with the bearing.

When choosing a fit, you should pay attention to the following four points:

(1) The circumferential surface of the bearing ring should have good support and uniform force to reduce deformation and fully exert the bearing capacity of the bearing.

(2) The ferrule cannot slide in the tangential direction in its mating surface, otherwise the mating surface will be damaged.

(3) The free end bearing must be compatible with the length change of the shaft and the housing bore, that is, it must have the ability to accommodate the axial position to swim within a certain range.

(4) It must be noted that the bearing is easy to install and disassemble, saving labor, time and money.

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Application range of FAG bearing crossed roller bearings

FAG bearing cross-roller bearings can withstand loads from all directions (such as axial, thrust or momentum loads). Since the FAG bearing is in contact with the outer surface of the track, the bearing is subject to load and elastic deformation is small.

This type of FAG imported bearings are commonly used in industrial robots, mission machinery and medical facilities. FAG  require high rigidity, tightness and high speed to ensure accurate position in cross-roller bearings, due to cylindrical rollers. The FAG bearings are arranged perpendicular to each other by a distance maintaining device on a 90° V-shaped groove rolling surface, so that one crossed roller bearing can withstand loads in all directions such as radial load, axial load and moment load.

The size of the inner and outer rings is minimized, and the special ultra-thin type is a small size close to the limit and has high rigidity, so it is most suitable for the joint portion or the rotating portion of the industrial robot.

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Five precautions for the use of imported bearings, five ways to avoid failure

Precautions for use
Rolling bearings make precision parts, so they need to be cautious when using them. They use high-performance imported bearings. If they are not used properly, they can not achieve the expected performance. Therefore, the following items should be used when using bearings:
Keep the bearings and their surroundings clean. Even if the smiling dust that is invisible to the naked eye enters the bearing, it will increase the wear, vibration and noise of the bearing.
Care must be taken when using the installation. Strong stamping is not allowed. It is not allowed to directly hit the bearing with a hammer. It is not allowed to transmit pressure through the rolling elements.
Use suitable and accurate installation tools, try to use special tools, and try to avoid the use of cloth and short fibers.
To prevent the corrosion of imported bearings, when taking the bearing directly by hand, wash the sweat on the hand and apply it with high-quality mineral oil before handling. In the rainy season and summer, pay special attention to rust prevention.
Bearing cooperation
Matching choice
The inner and outer diameters of the rolling bearing are manufactured to standard tolerances. The tightness of the bearing inner ring to the shaft and the outer ring to the seat hole can only be achieved by controlling the tolerance of the journal and the tolerance of the seat hole. The inner ring of the bearing and the shaft are matched by a base hole, and the outer ring of the bearing and the seat hole are made by a shaft.
The correct choice of cooperation must be aware of the actual load conditions, operating temperatures and other requirements of the imported bearings, but it is actually very difficult. Therefore, most of the cases are based on the use of lint selection.
Load size
The amount of over-win between the ferrule and the shaft or casing depends on the size of the load. The heavier load uses a larger over-win, and the lighter load uses a smaller over-win.
   1. Bearing channel one-side extreme position peeling
The one-side extreme position spalling of the channel is mainly manifested by a severe spalling band at the interface between the channel and the rib. The cause is that the imported bearings are not installed properly or there is a sudden axial overload during operation. The countermeasure is to ensure that the bearing is installed in place or the free side bearing outer ring is matched to the clearance fit, so that the bearing is compensated when the bearing is overloaded.

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Detailed steps for maintenance of TIMKEN imported bearings

In order to fully utilize TIMKEN's imported bearings and maintain their proper performance for a long time, regular maintenance (regular inspection) must be done.
Through proper periodic inspections, early detection of failures and prevention of accidents are important to improve productivity and economy.
1, cleaning
When removing the TIMKEN imported bearings, first take a look at the appearance with photography. Also, verify the amount of lubricant remaining and sample the lubricant before cleaning the bearings.
a. The cleaning of the bearing is carried out by rough washing and fine washing, and a metal mesh frame can be placed on the bottom of the used container.
b. When rough washing, remove the grease or adhesive with a brush or the like in the oil. At this time, if the bearing is rotated in the oil, be careful that the rolling surface will be damaged by foreign matter or the like.
c. When washing finely, slowly rotate the bearing in the oil and carry out it carefully.
The cleaning agent generally used is a neutral non-aqueous diesel oil or kerosene, and a warm alkali liquid or the like is sometimes used as needed. Regardless of which cleaning agent is used, it is often filtered and kept clean.
Immediately after cleaning, apply anti-rust oil or anti-rust grease to the bearing.
2, inspection and judgment
In order to judge whether the removed TIMKEN bearings can be reused, it is necessary to check the dimensional accuracy, rotation accuracy, internal clearance and mating surfaces, raceways, cages and seals.
Regarding the inspection result, it can be judged by a person who is using a conventional bearing or a proficient bearing.
The criteria for judgment vary depending on mechanical properties and importance, inspection period, and the like. Bearings must not be reused if they are damaged and must be replaced.
1) Breakage and defects of bearing components.
2) Peeling of the rolling surface of the raceway.

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