Designs and variants

Basic design bearings
The design and internal geometry of SKF basic design tapered roller bearings (fig. 1) enable these bearings to provide long service life. The crowned profile of the raceways and optimized surface finish of the inner ring guide flange enables these bearings to run cooler and consume less lubricant than conventional design bearings.
TQ-line bearings

TQ-line tapered roller bearings (fig. 1) are identified by the designation suffix Q and have operating characteristics that clearly set them apart from bearings made to conventional designs. The logarithmic contact profile provides optimum load distribution in the roller / raceway contact area to keep stress peaks within acceptable limits, even under slight misalignment. Like SKF Explorer bearings, the roller end / flange contact area of TQ-line tapered roller bearings is designed to reduce friction and wear at start-up. Normally the bearings do not need running-in procedures after mounting. Bearings that are preloaded experience only a small, controlled loss of initial preload.

Bearings with a QCL7C designation suffix

Bearings identified by the designation suffix QCL7C were originally designed for use as pinion bearings in the differential of industrial transmissions to provide a constant, accurate gear mesh. The bearings are characterized by their high degree of running accuracy and high preload capability. They have special friction characteristics and can be axially adjusted within narrow limits using the friction-torque method. Their internal design promotes the formation of a hydrodynamic oil film to substantially reduce friction and consequently operating temperature during the running-in period. When mounted, lubricated and maintained properly, bearings with a designation suffix QCL7C retain their preload setting.

Application specific bearings

For applications where the bearings are subjected to unique operating conditions, SKF can customize TQ-line bearings (designation suffix Q) to meet the needs of that particular application

For additional information about application specific tapered roller bearings, contact the SKF application engineering service.

Bearings with a flanged outer ring
Certain sizes of SKF single row tapered roller bearings are also available with a flange on the outer ring (fig. 2). Bearings with a flanged outer ring are relatively easy to locate axially in the housing. The housing bore is also easier and more cost-effective to manufacture, as shoulders are not required.
Matched bearings

Matched bearings (fig. 3) can be supplied for bearing arrangements where the load carrying capacity of a single bearing is inadequate, or where the shaft has to be located axially in both directions with a specific axial clearance or preload. The bearings and ring spacer(s) are matched in production and delivered as a set. When mounted, the radial load is evenly distributed between the bearings.

Depending on the requirements, matched bearings can be supplied in face-to-face, backto- back, or tandem arrangements.

The matched bearings listed in the product table constitute the basic SKF assortment. Other matched bearings can be supplied on request.

Matched bearings arranged face-to-face (fig. 4)

Matched bearings arranged face-to-face have load lines that converge toward the bearing axis. Therefore, the arrangement can accommodate a limited amount of misalignment. Axial loads in both directions can be accommodated, but only by one bearing in each direction.

The bearing set is supplied with an intermediate outer ring spacer.

Matched bearings arranged back-to-back (fig. 5)

Matched bearings arranged back-to-back have load lines that diverge toward the bearing axis to provide a relatively stiff bearing arrangement that can also accommodate tilting moments. Axial loads in both directions can be accommodated, but only by one bearing in each direction.

The bearing set is supplied with intermediate inner and outer ring spacers.

Matched bearings arranged in tandem (fig. 6)

Matched bearings arranged in tandem have load lines that are parallel. Radial and axial loads are shared equally by the bearings. This arrangement is used when the load carrying capacity of a single bearing is inadequate. However, matched bearings arranged in tandem can accommodate axial loads in one direction only. If axial loads act in both directions, a third bearing, adjusted against the tandem pair, must be added.

The bearing set is supplied with intermediate inner and outer ring spacers.

Cages

SKF tapered roller bearings are fitted with stamped steel cages as standard. Bearings with polymer cages are available on request (table 1).

The lubricants generally used for rolling bearings do not have a detrimental effect on cage properties. However, some synthetic oils and greases with a synthetic oil base and lubricants containing EP additives, when used at high temperatures, can have a detrimental effect on polyamide cages. For additional information about the suitability of cages, refer to Cages and Cage materials.

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