However, since the housing of the reducer is split, if the roundness of the bearing housing hole of the upper and lower housings is not properly controlled, the outer ring of the bearing will be caught after assembly so that it cannot float. As a result, one row of bearings is subjected to axial and radial forces (as shown on the right side of Figure 3), while the other column (left side of Figure 3) does not withstand forces or withstands small radial forces. The speed of the input shaft is already high speed for the self-aligning bearing. For the side that receives both the axial force and the radial force, the roller will have a large deflection, which will cause crushing and impact on the frame beam of the cage. Causes premature damage to the cage. In addition, due to this deflection, more sliding friction is generated, which causes an increase in friction between the rolling elements and the raceway, and an increase in heat generation.
In contrast, cylindrical roller bearings are more suitable for floating ends than spherical roller bearings (as shown on the right side of Figure 2). Figure 4 shows a NU type cylindrical roller bearing. From the internal structure, the function of the ribs on both sides of the outer ring is to axially position the rolling elements, while the inner ring has no ribs, so it can float under the action of the axial force. Therefore, even if the reducer housing is caught in the bearing outer ring, the amount of thermal expansion can still be released. Although the cylindrical roller bearing does not have the function of aligning, it increases the rigidity of the shaft and is advantageous for ensuring proper meshing of the bevel gear.
3. Fixed end bearing selection
In contrast to the fixed end of the input shaft, in addition to the bearing selection of Figure 1, double row tapered roller bearings can also be considered (as shown on the left side of Figure 2). With this type of bearing, there are two advantages.
First, better carrying capacity. For tapered roller bearings, there is a line contact between the rolling elements and the raceways; and between the rolling elements of the four-point angular contact ball bearings and the raceways, point contact. Therefore, when force is applied to the former, the force is distributed on a line; for the latter, the force is concentrated at one point. This design feature makes the tapered roller bearing have better bearing capacity than the four-point angular contact ball bearing. With the development of the scraper conveyor, the installed power is also getting larger and larger. The use of tapered roller bearings will better cope with high loads and also help to increase the rigidity of the shaft. Considering the tight fit of the bearing and the shaft, the double inner ring tapered roller bearing is more convenient during installation, while the double outer tapered roller bearing is more rigid to the input shaft.
Figure 5
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Cold Rolled Stainless Steel Sheets
Stainless steel plate surface smooth, high plasticity, toughness and mechanical strength, acid, alkaline gas, solution and other media corrosion resistance. It is an alloy steel that does not rust easily, but not absolutely. Stainless steel plate refers to the corrosion resistance of weak medium such as atmosphere, steam and water steel plate, and acid resistant steel plate refers to the corrosion resistance of chemical etched medium such as acid, alkali, salt steel plate.
According to the structure is divided into austenitic stainless steel plate, martensitic stainless steel plate (including precipitation hardening stainless steel plate), ferritic stainless steel plate, and austenitic ferritic biphase stainless steel plate and so on four categories? According to the main chemical composition of the steel plate or some characteristic elements in the steel plate to be classified into chromium stainless steel plate, chromium nickel stainless steel plate, chromium nickel molybdenum stainless steel plate and low carbon stainless steel plate, high molybdenum stainless steel plate, high purity stainless steel plate. According to the performance characteristics and use of steel plate classification, is divided into nitric acid resistant stainless steel plate, sulfuric acid resistant stainless steel plate, pitting stainless steel plate, stress corrosion resistant stainless steel plate, high strength stainless steel plate. According to the functional characteristics of the steel plate, it is divided into low temperature stainless steel plate, no magnetic stainless steel plate, easy cutting stainless steel plate, super plastic stainless steel plate. Currently, the commonly used classification method is according to the structural characteristics of steel plate and steel plate chemical composition characteristics and the combination of the two methods. Generally divided into martensitic stainless steel plate, ferritic stainless steel plate, austenitic stainless steel plate, duplex stainless steel plate and precipitation hardening type stainless steel plate or divided into chromium stainless steel plate and nickel stainless steel plate two categories.
Typical uses: pulp and paper equipment heat exchanger, mechanical equipment, dyeing equipment, film washing equipment, pipelines, coastal area building external materials, etc.
Cold Rolled Stainless Steel Sheets,Stainless Steel Sheet,Stainless Steel Coils,Astm Stainless Steel Sheet
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