1. Choose methods and steps
Choose appropriate rolling bearing, the import belongs to host a good job quality, prolong life, reduce maintenance time, reduce the enterprise whether maintenance costs, increase operation rate, has a very important role. Therefore, whether it is a design, production or use maintenance organizations in the choice, imported bearing, roll, usually choose imported bearings can be briefly steps:
1. According to the working conditions of bearing (including import direction load and load type, speed, lubrication, coaxial degree requirements, or positioning, GPS devices and maintenance environment, environmental temperature, etc.), choose the basic types of imported bearing, the tolerance classes and game;
2. Working conditions of the imported bearing and force and resource requirements, through the import of calculation model, according to the demands of bearing or bearing type selected, then import verification resources;
3. Check the bearing load rating and import limit speed.
Choose imported bearing limit rotational speed is the main consideration, requires resources and load capacity, dacron, other factors help to determine the type, structure, size and tolerance import bearings games and work for the final solution.
All kinds of rolling bearings have different functions, the use of imported using different mechanisms. Choose imported bearing type, usually should consider the following factors. In general: when choosing the thrust bearing, imported bearing, contact Angle for imported high speed applications typically use ball bearing radial inlet under heavy load, choose imported bearing roller. Generally choose many different vendors, products imported bearing, find the appropriate type. Selection considering various factors:
(1) import bearing body space and location
In automobile design is usually installed shaft size, then choose imported according to rolling bearing dimensions. Usually these small shaft bearings, imported wheel bearing ball bearing selection. However, when the machine imported bearing diameter direction restriction, imported bearing, selected needle light and ultra light series of ball or roller bearings, imported bearings; When imported machine shaft position is limited, may be especially narrow to narrow or series of ball or roller bearings imported.
(2) import bearing load size, direction and nature
Imported bearing load of the main factors. Roller bearings under heavy goods imported bearings to withstand a light or medium load, cement austenitic steel quenching production or import bearings, can withstand the impact and vibration load. In the direction of load under pure radial load, can be deep groove ball bearings and cylindrical roller bearing needle roller bearing imports. Carry axial load, cleaning ball, thrust can be said to bear axial load, thrust roller bearing can be clean said imports. When the radial and axial loads with the imported bearing, generally choose the import of angular contact ball bearings and tapered roller bearing. Part of cantilever support structure, using tapered roller bearings, angular contact ball bearing or imported and steam.

(3) the imported bearing self-aligning properties
When the axis and import MATS, have different views about errors or supporting shaft in close quarters, but a tougher, more easily bend, or fall, may be good for the heart performance optimization of ball or roller bearings, self-aligning ball bearing and external import. This kind of bearings imported bent slightly tilted or can keep normal work.
(4) strict import
Rigid means that imported, imported SKF Bearing By China size for the unit deformation force. Volume elastic deformation and imports much of the machine can be ignored, but in some mechanism, such as machine tool spindle bearings, imported hard - important factors, often should choose tube taper roller bearing and imported. Because of these two types of imported bearing load, the rolling element and raceway belongs to the weak point, rigid. In addition, various kinds of imported bearing preload, also can increase the bearing before rigid target. Such as ball bearing and angular contact bearings, tapered shaft vibration, prevent increase supporting rigid part installed in a predetermined axial pressure to each other. Here noted that the quantity can't too tight. Fish, can increase the resources of the imported bearing friction, temperature, bearing.

(5) imported bearing speed
Each has its own import bearing limit speed type, size, type and structure of physical nature, means that the highest import bearing limit speed work speed (r/min) is commonly used in scope than this will lead to import bearing temperature, oil, and even import bearings. Based on partial diameter D (r/min) of the axis of rotation speed units to do a factor (DN), choosing type and size DN imported bearing limit speed is of great significance. Most of the imported bearing manufacturers to provide product catalogue, the limit speed value lower than 90% of the practice shows that limit speed working condition is the best. Grease limit rotational speed is low, and imports of goods imported oil limit speed, and supply way can affect the limit speed. Grease, imported bearing limit speed, generally USES the high quality imported oil bearing the recirculation system at 80%, but the limit speed oil mist lubrication system, its limit rotational speed is better than some of the lubrication system mainly is 50%.
(6) separator design and structure, and influence the import bearing limit speed, because the rolling element and rolling contact surface separator is more expensive, therefore, the separation of high quality and low friction material, is not just the body, and help maintain, from the rolling oil film sliding contact. But such as stamping or separator separation is low, usually only rub body kept separate. So they are likely to have accidents and pain to avoid exchanges, resulting in lower speed limit. In order to work in a high speed when the deep groove ball should select bearings, imported bearings, angular contact bearing roller rotation speed is low; When import can work for taper roller bearing imports. Tapered roller bearing limit speed, usually about 65% in the groove ball bearings cylindrical roller bearings imported bearing contact Angle of 60% 60%. Thrust bearing limit rotational speed is low, only for low speed many times. Import bearings, small size, high speed make wood is wood. Imported bearings should be paid attention to choose the actual speed limit rotational speed is low.

(7) imported bearing axial displacement and swimming
Usually in two axes imported bearing distance. In order to adapt to different levels of heat affected axis and shell, the equipment to be imported bearing axial fixed a imported bearing, the other can swim (i.e., on a floating datum), to prevent or reduce the axial elongation caused the phenomenon of death. Usually choose the floating bearing inner ring or no blade bandage roller bearings and needle roller bearings, imported bearings, imported main axis and the internal structure such as container appropriate axial displacement of god. At this point, the inner ring and shaft bearing, can adopt tight fit. When imported bearing type floating bearing, such as deep groove ball bearings, imported bearings, roller imported bearing installation must solve and breach, or inner ring and shaft, a more liberal axis can float. Tapered roller bearing, spherical roller bearing import imported bearing and deep groove ball mostly imported, positioning for the type without the fixed - free installation. All reasonable positioning thrust roller bearings imported bearing type import.
( to promote import bearing installation and removal
Imported bearing, bearing type selection is dismantled equipment import, should also be appropriate, especially large bearing manufacturers and large import has special significance for installation and removal. General bearing ball bearings, angular contact bearing roller bearing and taper tube imported needle bearing installation, convenient disassembly, the inner ring and outer ring can be respectively in a shell or hole. In addition, hole diameter and taper sleeve spherical roller with a series of imported bearing, roller bearing and cylinder series double ball bearing, self-aligning also be easy to install.

 

hello, really good article.
But I think there are better bearings.
eg http://www.bocabearings.com/, among the most famous, are really strong and can travare all measures, the prices are a bit high.
http://www.timken.com/are really good, they are very durable, they are used originally for industrial machines and are American, you can find any kind.
www.omniabearings.com, German quality and low prices, you can find all the measures and the resistance there aren't equal.
http://www.rbcbearings.com/, perhaps the best, although personally I've never tried, but I find them in all discussions on the forums.
skf are of average quality and are imported. it is true the price is low, but for a Audi is more important the quality