Cylinderical roller bearing

 

Benefits


    SKF cylindrical roller bearings are available in many designs, series and sizes. The majority are single row bearings with a cage. High-capacity bearings, single and double row full complement bearings (without a cage) complete the SKF standard assortment listed in this catalogue.

    Bearings with a cage can accommodate heavy radial loads, fast accelerations and high speeds. Full complement bearings incorporate a maximum number of rollers and are therefore suitable for very heavy radial loads at moderate speeds. SKF high-capacity cylindrical roller bearings combine the high load carrying capacity of a full complement bearing with the high speed capability of a bearing with a cage.

    The factors that influence SKF cylindrical roller bearing performance and service life include but are not limited to the following:
    Roller end / flange contact area
    SKF cylindrical roller bearings have two integral flanges on either the inner or outer ring to guide the rollers. The bearings have “open” flanges, i.e. the inward face of the flange is inclined by a defined angle. The flange design, together with the roller end design and surface finish, promote the formation of a lubricant film to reduce friction and frictional heat.
    Logarithmic roller profile
    The roller profile determines the stress distribution in the roller/raceway contact area. As a result, the rollers in SKF cylindrical roller bearings have a logarithmic profile to distribute loads evenly along the rollers. This prevents peak stresses at the roller ends to extend bearing service life. The logarithmic profile also reduces sensitivity to misalignment and shaft deflection.
    Surface finish
    The surface finish on the contact surfaces of the rollers and raceways maximizes the formation of a hydrodynamic lubricant film and optimizes the rolling motion of the rollers. The benefits derived from this, compared with traditional designs, include enhanced operational reliability.
    Interchangeable components
    The separable components of same-sized SKF cylindrical roller bearings are interchangeable. Any bearing ring with a roller and cage assembly can be assembled with any removable ring of the same bearing type and size having the same internal clearance class. This is particularly important when bearings and their components must be mounted independently of each other.
    The SKF range of cylindrical roller bearings comprises the basic types
    • single row cylindrical roller bearings, caged, mainly of the NU, NJ, NUP and N designs (fig 1)
    • double row cylindrical roller bearings, caged, mainly of the NNU and NN designs (fig 2)
    • multi-row cylindrical roller bearings, caged (fig 3, fig 4)
    • single row full complement cylindrical roller bearings, mainly of the NCF and NJG designs (fig 5)
    • double row full complement cylindrical roller bearings, mainly of the NNF design (fig 6)
    • multi-row full complement cylindrical roller bearings, with four or eight rows of rollers (fig 7).
    In addition to the standard assortment the comprehensive SKF range of cylindrical roller bearings consists of
    • single row high-precision all-steel or hybrid cylindrical roller bearings (fig 8)
    • double row high-precision all-steel or hybrid cylindrical roller bearings (fig 9)
    • cylindrical roller bearings and bearing units for railway axleboxes (fig 10)
    • single row cylindrical roller bearings for traction motors for railway applications
    • backing bearings for cold rolling mills of the cluster type (fig 11)
    • indexing roller units for continuous furnaces (fig 12).
    Other cylindrical roller bearings for special applications include a special electrical insulated coating, called INSOCOAT®. Details of these bearings can be found in this catalogue in the section Engineering products.
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