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  • What is the selection of the rolling bearing?

    Web2016-12-29

    Basis for selection
    According to the rotation of the loads acting on the bearings relative to the ring, the load bearing ring imported bear has three kinds: local load, cyclic load, load swing. Usually cyclic load (rotating load), swing load with tight fit; local load in addition to the use of special requirements, generally should not be used with tight fit. When the import bearing ring to bear dynamic load and heavy load, the inner ring and the outer ring should be used by interference fit, but sometimes the outer ring can be a little looser, should be able to swim in the axial hole bearing seat; when the import bearing bear load and load swing is light, with the ratio of tight fit slightly loose some.
    (2) load size
    Depends on the amount of interference between import bearing ring and the shaft or housing bore on the size of the load, the load is heavy, the larger the amount of interference fit; the load is light, using a small surplus with the amount. General radial load P less than 0. 07C for light load, P greater than 0. 07C is equal to or less than 0. 15C for normal load, P greater than 0. 15C for the heavy load (C for the bearing rated dynamic load).
    Working temperature
    Imported bearings in operation, the ferrule temperature is often higher than the adjacent parts of the temperature, therefore, imports of bearing inner ring may be due to thermal expansion and shaft loosening, the outer ring may be due to thermal expansion effect of bearings in the housing bore axially moving. Help select, on imported bearing device part temperature difference, swelling shrinkage should be taken into account, large temperature difference, and the inner ring of the shaft with the choice of the amount of interference should be bigger.
    Rotation precision
    In order to eliminate the effect of elastic deformation and vibration, the clearance of the bearing should be avoided.
    Structure and material of bearing shell hole
    It is not appropriate to use the interference fit with the outer ring of the bearing shell, and the outer ring should not be rotated in the shell hole. For the installation of the hole in the thin shell, light metal shell hole or hollow shaft bearings, the use of thicker than the thickness of the shell hole, cast iron shell hole or solid shaft more tight fit.
    Easy installation and removal
    For heavy machinery, bearings should be used loosely. The tight fit, can choose the separation bearing, the inner ring and the cone with compact sets or unloading sleeve bearing.
    Axial displacement of bearing
    With a ring, when the requirements of bearing in operation can move in the axial direction, the bearing outer ring and bearing shell hole should adopt a loose fit.
    Selection of fit
    The combination of the bearing and the shaft is made of a base hole system, and the shaft is used in combination with the shell. The machine manufacturing industry with the bearing and the shaft of the tolerance system is different, the bearing diameter tolerance zone is the same with the following change, therefore, in the conditions with the bearing diameter and shaft fit more closely than usual. The diameter of the bearing shaft tolerance zone and the central axis of the tolerance zone, although the same is below the zero line, but its value is not the same with the general tolerance system.

  • Terminology and corresponding analysis of bearing assembly process

    Web2016-12-29

    The bearing will encounter many technical terms in the installation process, Dongguan city double Bearing Co., summed up the following terminology commonly used and the corresponding analytical terms, please refer to, if there is a mistake to welcome!
    The contact angle of 1 plane perpendicular to the bearing axis line (radial plane) and by the bearing ring or washer transmission to the joint effect of rolling line (nominal line) between the two.
    The diameter of the inner (outer) cylinder of a ball in the inside diameter of the 2 ball group.
    The diameter of the inner (outer) cylinder of a roller in the radial contact roller bearing of the 3 roller group.
    4 nominal bearing ring width two end theory (the distance between the back of the washer). To define the width of the radial bearing (thrust bearing height).
    Two tangent plane intersection and the distance between the center line of 5 actual bearing width and limit bearing radial bearing width of the actual end of the ring. Bearing width is defined by inner ring face and outer ring end face.
    6 bearing actual width deviation bearing actual width and nominal width difference.
    7 the radial runout of the inner ring of the inner ring of a complete set of bearings is the difference between the maximum and minimum radial distance between the inner surface of the inner ring and the fixed point of the outer ring at different angular positions. The angular position of the point above or on the two sides of the rolling body should be in contact with the inner or outer raceway or the inner side of the back side of the ball (tapered roller bearing) in contact with the inner surface of the bearing parts in a normal position.
    8 sets of bearing outer ring radial runout Kea outer ring in different angular position, the outer diameter of the surface and the inner ring of a fixed between the maximum and minimum radial distance difference. The angular position of the above points or the rolling bodies on both sides of the point should be in contact with the inner or outer ring raceway or the back side of the inner ring (tapered roller bearing).
    9 sets of bearing inner ring end face inner ring raceway beating Sia in different angular positions, from the inner ring axis radial distance is equal to the diameter of the inner ring raceway contact half, inner ring with respect to the reference face between the outer ring of a fixed point of maximum and minimum axial distance difference. The inner and outer raceways shall be in contact with all rolling elements.
    10 sets of bearing outer ring raceway outer ring end face runout at different angular positions, from the outer axis of radial distance equal to the diameter of outer ring raceway contact at half, and between the inner ring base end relative to a fixed point of maximum and minimum axial distance difference. The inner and outer raceways shall be in contact with all rolling elements.
    The 11 end of the bearing hole to beat Sd in the radial distance of inner ring axis is equal to the diameter of the raceway contact half, difference of maximum and minimum axial distance perpendicular to the ring axis plane and the reference face of a ring.

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