Single row tapered roller bearings

Product Description

Single row tapered roller bearings

NEWORLD single row tapered roller bearings (fig. 1) are designed to accommodate combined loads, i.e. simultaneously acting radial and axial loads. The projection lines of the raceways meet at a common point on the bearing axis (apex point A, fig. 2) to provide a true rolling action and therefore low frictional moments during operation. 

The axial load carrying capacity of tapered roller bearings increases with increasing contact angle α. The size of the contact angle, which is usually between 10° and 30°, is related to the calculation factor e : the larger the value of e, the larger the contact angle.

Features and benefits

  ●  Low friction

      The optimized roller end design and surface finish on the flange (fig. 3) promote lubricant film 

      formation, resulting in lower friction. This also reduces frictional heat and flange wear. In 

      addition, the bearings can better maintain preload and run at reduced noise levels.

●  Long service life

      The crowned raceway profiles of basic design bearings and the logarithmic raceway profiles of 

      NEWORLD bearings optimize the load distribution along the contact surfaces, reduce stress 

      peaks at the roller ends (fig. 4), and reduce the sensitivity to misalignment and shaft deflection 

      compared with conventional straight raceway profiles (fig. 5).

●  Enhanced operational reliability

      Optimized surface finish on the contact surfaces of the rollers and raceways supports the formation of 

      a hydrodynamic lubricant film.

  ● Consistency of roller profiles and sizes

     The rollers incorporated in NEWORLD tapered roller bearings are manufactured to such close 

     dimensional and geometrical tolerances that they are practically identical. This provides optimal 

     load distribution, reduces noise and vibration, and enables preload to be set more accurately.

  ● Rigid bearing application

     A single row tapered roller bearing is typically adjusted against a second tapered roller bearing. By 

     applying a preload, a rigid bearing application can be achieved.

  ●  Running-in period with reduced temperature peaks

      Tapered roller bearings typically have a running-in period, during which a conventional design tapered 

      roller bearing experiences a significant amount of friction, resulting in wear. This effect is noticed as a 

      temperature spike (diagram 1). With NEWORLD tapered roller bearing designs, friction, frictional heat 

      and wear are significantly reduced, provided the bearings are mounted and lubricated correctly.

●  Separable and interchangeable

    The inner ring with roller and cage assembly (cone) can be mounted separately from the outer ring 

    (cup). Furthermore, the separable components (fig. 6) are interchangeable. This facilitates mounting, 

    dismounting and also maintenance inspection routines.

Basic designs

Designs and variants 

NEWORLD single row tapered roller bearings (fig. 1) are available in many designs and variants and in many series and sizes, including: 

   ●  basic design bearings 

   ●  application-speciic bearings 

   ●  bearings with a langed outer ring 

Basic design bearings

   ●  have a design and internal geometry that provide long service life

   ●  have crowned raceway profiles and an optimized surface finish of the inner ring guide flange that 

       enables them to run cooler and consume less lubricant than conventional design bearings

   ●  have load rating values that are in accordance with ISO and even above 

   ●  offer a cost-effective solution for standard industrial applications

On request, NEWORLD can also supply any inner ring with roller and cage assembly (cone) or any outer ring (cup) separately.

Application-specific bearings

For applications where the bearings are subjected to unique operating conditions, NEWORLD manufactures customized single row tapered roller bearings on request. To meet the needs of these particular applications, NEWORLD manufactures, for example, pinion or low-friction bearings with the following features:

Pinion bearings

   ●  are designed for pinion shafts in the differentials of automotive transmissions to provide a constant, 

       accurate gear mesh

   ●  have very narrow geometrical tolerances and high preload capability

   ●  have special friction characteristics and can be axially adjusted within narrow limits using the friction-

       torque method

   ●  have an internal design that supports the formation of a hydrodynamic lubricant film to substantially 

       reduce friction, and consequently the operating temperature, during the running-in period

   ●  retain their preload setting when mounted, lubricated and maintained properly

   ●  are identified by the designation suffix CL7C

Low-friction bearings

   ●  are designed to meet the ever-increasing demands to reduce friction and energy use

   ●  optimize a reduction in friction through their internal geometry, number of rollers, surface finish and 

       redesign of their cage

   ●  have a frictional moment that is at least 30% lower when compared with a same-sized NEWORLD 

       standard bearing

   ●  normally do not need a running-in procedure because their optimized contact profiles provide 

       optimum load distribution and they experience only a small, controlled loss of initial preload

   ●  generate less frictional heat and therefore enable extended lubrication intervals or operation at 

       higher speeds

   ●  have a roller and cage assembly with a lower mass and therefore reduced inertial forces in the 

       bearing, which reduce the risk of skidding and smearing

   ●  are typically used in automotive and industrial transmissions

Cages

Bearings with a flanged outer ring

NEWORLD also manufactures certain sizes of single row tapered roller bearings with a flange on the outer ring (fig. 7). These bearings are easy to locate axially in the housing. The housing bore can be manufactured more easily and more cost-effectively because housing shoulders are not required.

Cages

NEWORLD single row tapered roller bearings are fitted with one of the cages shown in table 1. The standard stamped steel cage is not identified in the bearing designation. If non-standard cages are required, check availability prior to ordering.

Matched tapered roller bearings

Matched tapered roller bearings 

The NEWORLD assortment of matched single row tapered roller bearings (fig. 8) is based on popular sizes of single row tapered roller bearings. Depending on the application requirements, matched tapered roller bearings are available in different designs and variants: 

   ●  matched bearings arranged face-to-face 

   ●  matched bearings arranged back-to-back 

   ●  matched bearings arranged in tandem 

The matched bearings listed in the product tables constitute the basic NEWORLD assortment. NEWORLD can supply other matched bearings on request. Depending on the design, matched bearings can locate the shaft axially in both directions with a specific axial clearance or preload. 

Also depending on the design, these bearings can provide a relatively stiff bearing arrangement. 

The bearings and ring spacer(s) are matched in production, are delivered as a set and are ready-to-mount.

Matched bearings arranged face-to-face 

   ●  have load lines that converge toward the bearing axis (fig. 9) 

   ●  can accommodate a limited amount of misalignment 

   ●  can accommodate axial loads in both directions 

   ●  are supplied with an intermediate outer ring spacer as a set

Matched bearings arranged back-to-back 

   ●  have load lines that diverge toward the bearing axis (fig. 10) 

   ●  provide a relatively stiff bearing arrangement 

   ●  can accommodate tilting moments 

   ●  can accommodate axial loads in both directions 

   ●  are supplied with intermediate inner and outer ring spacers as a set

Matched bearings arranged in tandem 

   ●  have load lines that are parallel (fig. 11) 

   ●  share radial and axial loads equally 

   ●  are used when the load carrying capacity of a single bearing is inadequate 

   ●  can accommodate axial loads in one direction only 

       If axial loads act in both directions, a third bearing must be added and adjusted against the tandem 

       pair. 

   ●  are supplied with intermediate inner and outer ring spacers as a set

Application

Application:

   ●  automobile wheels (both rear and front) 

   ●  variable speed devices

   ●  differential machanisim

   ●  small gear shafts

   ●  machined tool spindles

   ●  construction machines

   ●  large-sized agricutural machines

   ●  gear deceleraton devices for railway vehicles 

   ●  small deceleration devices for mill roll necks

   ●  crane wheels

   ●  sheaves