Use a Notes Rolling precision parts, and thus accordingly be cautious about both the use of high-performance bearings, if used improperly, they can not achieve the expected performance requirements when in use, so use the bearings should be aware of the following :
1.1 to maintain the cleanliness of the bearing and its surroundings. Even if invisible to the naked eye smile dust from entering the bearing will increase bearing wear, vibration and noise.
1.2 installation carefully, do not allow powerful punch, hammer direct percussion bearings, not allowed to transmit pressure through the rolling element is not allowed.
1.3 Using the installation tool, try using a dedicated tool, try to avoid using the cloth and staple fiber and the like.
1.4 to prevent corrosion of the bearing, direct hands to take bearings, to fully wash away the sweat of the hands, and coated with high quality mineral oil and then operate, with particular attention to anti-rust in the rainy season and summer.
2 with the
The inner diameter and outer diameter of 2.1 with the choice of rolling bearings are manufactured according to standard tolerances, the bearing inner ring and shaft, with the tightness of the outer ring and housing bore only by controlling the journal tolerances and bore tolerances to achieve. Bearing inner ring and shaft with the hole basis, the bearing outer ring and housing bore with the shaft system. Rolling bearings - commonly used with the Figure 2-1. The correct choice with, you must know the actual load conditions of the bearing operating temperature and other requirements, but in fact it is very difficult. Therefore, in most cases is to select with the use Lapping.
2.2 load nature of the tie should first consider the load vector relative ferrule rotation. In accordance with the synthetic radial load vector relative to the rotation of the ring, the rings are to bear the load can be divided into: a fixed load, the rotating load and oscillating loads, shown in Figure 2-2.
a fixed load acting on the rings on the synthetic radial load from the local area of ??the ring raceway is exposed, and transmitted to the shaft or bearing the corresponding local area, this load is called a fixed load. Which is characterized by synthetic radial load vector and the ring is relatively static. Bear the ring of directional load can choose a more loose fit.
(b) rotation of the rotating load acting on the rings on the synthesis of radial load along the circumferential direction of the raceway, sequential exposure to all parts of this load is known as the rotating load, which is characterized by the synthesis of radial load vector relative to the ferrule rotation . Withstand rotation load of the rings to be elected to a tight fit, in exceptional circumstances, such as the load is very light, or in a heavy-duty role of rings only occasional low-speed rotation, the bearings used in hard materials and surface roughness at high withstand the rotating load The rings can also be used loose with.
c. swing the load acting on the rings on the synthesis of radial load direction uncertain, this load is called the swinging load or non-directional load, which is characterized by synthetic radial load vector on the role of rings in the ring raceway of a certain swing within the region for a certain region of the raceway to bear, or the role of impact load in the load on the bearing vibration load, its direction, values ??change frequently load. Under oscillating load bearing for the jacket ring and the week, bearing holes of the tie should be a tight fit.
2.3 load size of the ferrule, shaft or housing had to win the amount depends on the size of the load, the heavier the load over to win the amount of lighter load smaller over win amount. Usually the equivalent radial load p is divided into "light" and "normal" and "heavy" load three cases, with the bearing rated dynamic load of c off series in Table 2-1 for the tolerance zone of the shaft and housing bore reference.
2.4 axis and the shell hole tolerance zones to select the size and nature of the load controlled tolerances on the shaft and the Commission with the provisions of Table 2-2 - Table 2-4.
2.5 meet the surface roughness and the shape and position tolerances with the surface roughness and geometric tolerance, a direct impact on product performance, such as wear resistance, corrosion resistance, and cooperate with nature. To this end, the form and position tolerances of the reasonable requirement that axis and the shell holes and the mating surface roughness requirements for stability with the nature, increase the connection strength is essential to win with. Axis and the shell hole with surface roughness and form and position tolerances are shown in Table 2-5 - Table 2-6 and Figure 2-3
3 bearing installation bearing installation of good or bad, will affect the bearing accuracy, life and performance. , The installation of the bearing, in accordance with the operating standards include the following items, including the bearing installation.
3.1 cleaning bearings and related parts, (greased bearings and both a seal or dust cover, seals bearings before installation without cleaning.)
3.2 check the relevant parts of the size and finishing
3.3 Installing the bearing should be installed according to the nature of the bearing structure, size, and bearing components with fixed, the pressure should be added to the ferrule end face of the tight fit, can not be passed through the rolling pressure, bearing installation generally use the following method:
(a) press-fit bearing inner ring and shaft to make a tight fit, the outer ring and the bearing hole is loose with the available presses will be bearing the first pressure mounted on the shaft axis together with the bearing with load bearing hole press-fit bearing inner side surface, the pad assembly sleeve of a soft metal material (copper or mild steel), shown in Figure 2-4. Assembly casing diameter should be slightly larger than the journal diameter, outside diameter diameter slightly smaller than the bearing inner ring ribs, in order to avoid pressure in the cage. The bearing outer ring and the bearing hole tight fit, the inner ring and the shaft is loose with the bearing first pressed into the bearing hole, this time the assembly casing outside diameter should be slightly smaller than the diameter of the bore, as shown in Figure 2 -5 as shown. If the bearing ring and shaft and housing bore are a tight fit, the installation of indoor ring and outer ring to be pressed into the shaft and housing bore, the assembly structure of the casing should be able to charge tight end face of the bearing inner and outer rings, such as shown in Figure 2-6.
(b) heating with heated bearings or bearing, the use of thermal expansion will be a tight fit to change the installation method for a loose fit. Is a common and labor-saving method of installation. This method is suitable for the large amount of interference the installation of bearings, bearing or separable bearing rings into the tank before the hot charging uniform heating 80-100 ℃, and then removed from the oil onto the shaft as soon as possible, in order to to prevent the inner face after cooling and shaft shoulder fit is not tight, bearing cooling, the axial fastening. Tight fit of the bearing outer ring and light metal bearing heating bearing thermal loading can be avoided with the surface by abrasion. Tank heating bearings in a certain distance from the bottom should be at the network gate, shown in Figure 2-7, or hook hanging bearings, the bearings can not be put on the bottom, to prevent impurity entering into the bearing or uneven heating The tank must have a thermometer, strictly control the oil temperature must not exceed 100 ° C, to prevent tempering effect, so that the rings of the hardness decreased.
(c) tapered bore bearing installation of tapered bore bearings can be directly mounted on the taper journal or load adapter sleeves and withdrawal sleeves, cone, with the tightness of the available bearing radial clearance to reduce the amount measure, prior to installation should be measured radial bearing clearance, the installation process should always measure the clearance to the clearance needed to reduce the amount until the installation generally use the locking nut installation, also can be used heating installation .
(d) the installation of the thrust bearing thrust bearing weeks with the axis line with generally for the transition with the seat and the bearing hole with general clearance fit, so the bearing easier to install, two-way thrust bearing axis Springs should be in the axis on fixed, in order to prevent relative axial rotation. Bearing installation, under normal circumstances is the axis of rotation of the majority, the inner ring and the shaft with the win too with the bearing outer ring and bearing room with clearance fit.
3.4 Bearing installation inspection
3.5 lubricant added
Four bearings operate check the bearing end of the installation should be immediately running to check to determine that the installation is normal.


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