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Tapered roller thrust bearings

Tapered roller thrust bearings

Single direction axial tapered roller bearings with two tapered raceways can support very high axial forces in one direction. A typical application for these axial tapered roller bearings is in flush heads for drilling rigs.

Double direction axial tapered roller bearings and Screw-down bearings are usually used in blooming stands and section rolling stands.

Taper roller thrust bearings enable axially very compact bearing arrangements to be produced which can carry very heavy axia loadsare insensitive to shock loads and are stiff FV produces single and double direction taper roller thrust bearings.The screwdown bearings constitute a special design of single direction taper roller thrust bearing and have a full complement of rollers. They are used for rolling mill screw- down arrangements. 

FV taper roller thrust bearings are produced with the "logarithmic" contact profile between raceways and rollers to guarantee optimum stress distribution in the bearing, thus enhancing bearing life. 

The taper roller thrust bearings with cage are of separable design so that the two washers and the roller and cage thrust assembly can be mounted separately and easily.The full complement screw-down bearings are held together by special retaining components and, to simplify handling, the washers have threaded holes for eye bolts.


Single direction taper roller thrust bearings

TRB


FV produces single direction taper roller thrust bearings in two designs which differ in the execution of the washers.

Bearings of the one design (1) have shaft and housing washers which have the same dimensions. These washers both have a tapered raceway and one retaining flange. Bearings of this design are to be preferred where very heavy axial loads occur as, for example, in the swivels of drilling rigs or in crane hooks. The bear- ings have a cage which is centred on both washers.

Bearings of the other design (2) have a shaft washer with tapered raceway and retaining flange whereas the housing washer is plane (flat). Therefore, bearings of this design are able to accept minor eccentricities of the shaft with respect to the housing bore without any detrimental influence on bearing performance. With the exception of a few sizes which have a full complement of rollers, the bearings are fitted with a roller centred cage. 


Double direction taper roller thrust bearings


Taper roller thrust bearings of the double direction type are mainly used together with multi-row cylindrical roller bearings in rolling mill applications. Those bearings with a plane shaft washer(3) are the more popular as they are able to accommodate slight eccentricities of the shaft with re spect to the housing bore, of the order of the radial internal clearance of the radial bearing with which they are used. A spacer sleeve is arranged between the two hous ing washers. This is dimensioned so that the cover screws of the chock can be fully tightened and no special spring adjust- ment of the bearing is required.

The double direction taper roller thrust bearings with tapered raceways on the shaft and housing washers (4) generally have a higher axial load carrying capacity than the bearings with a plane shaft wash- er and are also able to radially locate the shaft to a certain extent.if the load carrying capacity of these bearings is inadequate with respect to the requisite life, the double row taper roller bearings with large contact angle listed on pages 532 to 535 can be used.

As the double direction taper roller thrust bearings are normally mounted with a loose fit on the roll neck as well as in the chock, the shaft washer of most bearings has one or two locating slots.It is then possible to prevent the shaft washer from 

rotating on its seating by using keys which engage the slots or by other similar means. 


Screw-down bearings

STTRB


Taper roller thrust bearings of this type must be able to accommodate extremely heavy axial loads and also permit angular movement of the screw spindle with re spect to the support. The bearings are therefore generally of the full complement type and have extremely long rollers of large diameter. To be able to accommod ate the alignment movements of the chock without detrimental effect on bearing performance, the bearings have one sphered washer. This may be either the shaft or the housing washer.  The neces sary alignment movements take place in bearings having a sphered shaft washer above the roller complement between the sphered shaft washer surface and a corres pondingly concave sphered screw spindle or pressure plate. The pressure plate can also be supplied by FV.

Where the housing washer is sphered the alignment movements are accommod ated below the roller complement between the housing washer and the sphered pressure plate.The pressure plate for these bearings is always supplied with the bearing.

FV produces many designs of screw- down bearing; they are tailored to meet the particular requirements of the application. 

A particularly popular design is that shown in fig 5. 


Dimensions

The dimensions of taper roller thrust bear- ings are not standardised.


Misalignment

Taper roller thrust bearings with plane washers cannot accept any misalignment of the shaft with respect to the housing nor any errors of angle of the support surfaces in the housing and on the shaft.



Single direction taper roller thrust bearings

Single direction taper roller thrust bearings

Single direction axial tapered roller bearings with two tapered raceways can support very high axial forces in one direction.The bearings are separable. As a result, the rings can be mounted separatel...

Double direction taper roller thrust bearings

Double direction taper roller thrust bearings

Double direction axial tapered roller bearings can support very high axial forces in both directions. In these ready-to-fit bearings, the axial internal clearance is set by the ring between the housin...

Screw-down bearings

Screw-down bearings

Axial tapered roller bearings for screw-down mechanisms. Screw-down bearings of Taper roller thrust bearings of this type must be able to accommodate extremely heavy axial loads and also permit angula...

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