Bearing fit

Web Design And Seo For www.china-webdesign.com

slim bearing - China Manufacturer

Thank you for inquiry my slim bearing, Tel: 0379-64331653, E-mail: info@lyvsg.com

http://www.lyvsg.com/slim-bearing/

In the supporting parts of the machine, in order to prevent the bearing inner ring and the shaft, the outer ring and the outer ring relative sliding movement occurs when the machine is running, the holes must be simple and effective way. Especially for special light, thin-walled ultralight series bearing rings, tight fit, bearing rings can be in operation, even by force, uniform and give full play to the carrying capacity of the bearing rolling elements. However, the choice of bearing-fitting can not be too tight, because the inner ring of elastic expansion and contraction of the outer ring of the bearing internal clearance reduction until completely disappear, thereby affecting the normal operation of the bearing.
1. Bearing fit selection
(1) the bearing of the cylindrical inner borechina bearing manufacturer
Select bearing with several factors should be considered are as follows:
â'  type of load
According to the load acting on the bearings, the case of the ferrule rotation of the ferrule to withstand the load is divided into a fixed load, the rotary load and swing load three.
a fixed load
The synthetic radial load by ferrule raceway local area which are subject to, and and corresponding pass to the shaft or housing mating surfaces of the corresponding local area wind. This load is called a fixed load.
The characteristics of the fixed load is the synthesis of the amount of radial load, with the ferrule relatively stationary. The ferrule under fixed load generally use a looser fit.
b rotary load
Acting in the Synthesis of the radial load vector on the bearing rings rotate along the circumferential direction of the raceways, sequentially received by the various parts of the raceway, and accordingly transmitted to the various parts of the shaft surface of the housing hole. This load is called rotary load, also known as cyclic loading.
The characteristics of the rotary load is a the synthetic radial load vector relative rotation of the ferrule. Withstand the rotary load ferrule shaft or housing bore should be used to filter or interference fit. Using clearance fit installation, slippage may occur between each other, which will l ead to the contact surface wear, friction and heat, so that the temperature rise sharply soon damaged, the bearing. Together over the size of the amount of interference may be based on the functioning of the bearing under load, without causing ferrule "crawl" on the mating surface of the shaft or housing bore principle.
C. swinging load
Within a certain region of the ferrule raceways acting on synthetic radial load vector on the bearing rings relative swinging raceway region is exposed, and the phase is transmitted to a certain area of ??the surface of the shaft or housing bore, or acting on the bearing The load on the shock load, vibration load, the load direction or values change frequently, this load is called swinging loads, also known as the direction of the load.
Bearings withstand swing load, especially in heavy load to bear, inside and outside the circle shall be used for the interference fit. When the rotation of the inner ring swing, typica lly the inner race with rotary load. Sometimes, however, the outer ring must be in the outside of the housing to bearing swimming or load lighter, and can be used with rotary load slightly loose.
â'¡ load sizeFAG bearing
Bearing rings in the radial component of the load under the action of, its radial compression would be easy to cause relaxation complexes, especially in the case of return to transfer load, prone to slippage. Therefore, for the heavy-duty occasions, usually should be more than a light load and normal load occasions with a much tighter. In short, the heavier the load, the tie shall be the greater of the amount of interference.
(3) Operating Temperature
Bearing in operation, because the ferrule of the operating temperature is usually higher than the temperature of the adjacent parts, the bearing inner ring may be due to thermal expansion and bearing loosened due to thermal ex pansion, the outer ring may affect the axial bearing clearance, therefore, in the choice of co-ordination must be noted that considering the temperature difference between the ferrule and heat conduction direction.
â'£ rotational accuracy
When higher stability requirements on the accuracy and functioning of the rotation of the bearing, in order to eliminate the elastic deformation of the bearing member and the effects of vibration, the amount should be as to avoid a loose fit.
The â'¤ shaft and shell structure and material
If the shaft and the housing (box) bore surface open irregular shape will cause the bearing, the irregular deformation of the outer ring, and Unevenness. Split housing (box) of the body, and the bearing outer ring with inappropriate interference fit, but should not be the hole rotation of the outer race in the housing (box). When the bearing is mounted on the thin wall, the hole or a hollow shaft of light alloy housing (box), In order t o ensure that the bearings have sufficient bearing surface, should be used than body or a solid body, the cast iron housing (box) mounted on the thick-walled enclosure (box) axis of the selected complex matter.
The â'¥ installation and removal
Many of the complicated structure of the application, in order to facilitate the installation and removal, requires the use of a clearance fit. Bearing operation must be interference with the installation, you can use a separate type bearings (outer ring were installed cylindrical roller bearings, needle roller bearings, tapered roller bearings and thrust bearings) or conical The inner hole of the bearing, allows the handling easy.
â'¦ fixed end bearing axial displacement
This displacement is the requirement that the installation bearing a non-fixed end of the ferrule in the axial direction has a certain swimming gap. Usually will bear a fixed load ferrule (usually outer) gap with the installation. If the inner or o uter side of free file cylindrical roller bearings (2000 and 3200) or needle roller bearings installed in the non-fixed end, the inner and outer rings are interference fit.
(2) a conical inner bore of the bearing
The conical bore bearings, installation and removal more convenient and can be installed directly on a tapered journal or external tapered cylindrical intermediate sleeve (adapter sleeve, withdrawal sleeve), and then the side of the middle set of the cylinder together mounted on a cylindrical shaft.slim bearings
The bearing outer ring and housing (box) hole with the same rules of the cylindrical bore bearings.
Non-separable type bearings with adapter sleeve or withdrawal bush, can be used to a greater tolerance of the bearing axis geometric tolerance must be strictly controlled.
2. Bearing and shaft and housing fits
The bearings and shaft with hole basis, bearing shell with the basic shaf t system. Tolerance system used in the bearing and shaft and machine manufacturing tolerances of the inner diameter of the bearing negative tolerances, Therefore, in the use of the same compound under the conditions, the bearing inner diameter and shaft with more closely than usual complexes. Bearing OD tolerance for negative tolerance is not the same, but its tolerance values and the general tolerance system.