Four-row cylindrical roller bearings with cylindrical bore

SKF four-row cylindrical roller bearings with cylindrical bore are available in many designs dictated by the application or by maintenance considerations. The various designs differ basically in the number of inner and outer rings as well as in the number of loose or integral flanges on the outer ring. There are also differences in cage design and in the number of rollers per cage pocket.
For bearing arrangements (up to 8,5 m/s rolling speed) where the bearings are mounted with a loose rather than an interference fit on the roll neck, in order, for example, to enable rapid roll replacement in the chocks, SKF four-row cylindrical roller bearings are supplied in special designs. To largely compensate for the disadvantages of the loose fit (the inner rings wander on the seat which can damage both bearing and seat), these bearings have a helical groove in the bore and/or lubrication grooves in the side faces of the bearing rings (fig 1). These grooves enable the mating surfaces to be efficiently lubricated.
Bearings which have one or more of these features are identified in the product table by the following letters

GHelical groove in inner ring bore
WLubrication grooves in the side faces of the bearing rings
WILubrication grooves in the side faces of the inner ring
WOLubrication grooves in the side faces of the outer ring
W33Annular groove and three lubrication holes in outer ring
The letters appear under the heading "Design" in the product table following the design identification, e.g. BC4.10/W33GW.

Design

SKF produces four-row cylindrical roller bearings with cylindrical bore in many designs. Those shown in the product table are briefly described in the following.

BC4.1 design

Two outer rings each with three integral flanges. One inner ring. Two roller guided double pronged machined brass cages. With or without annular groove and/or lubrication holes in the outer rings (fig 2).

BC4.2 design

Two outer rings each with three integral flanges, and with an intermediate ring between the two outer rings. One inner ring. Two roller guided double pronged machined brass cages. With or without annular groove and/or lubrication holes in the outer rings (fig 3).

BC4.3 design

Two outer rings each with an integral central flange and two loose flange rings; one intermediate ring. One inner ring. Two roller guided double pronged machined brass cages. With or without annular groove and/or lubrication holes in the outer rings (fig 4).

BC4.4 design

Two outer rings each with two integral flanges. One inner ring. Two window-type cages of brass (two rollers per cage pocket) (fig 5).

BC4.5 design

One outer ring with three loose guide rings and two loose flange rings. One inner ring. Two double pronged machined brass cages. With or without annular groove and/or lubrication holes in the outer ring (fig 6).

BC4.6 design

One outer ring with five integral flanges. One inner ring. Four roller guided pronged cages of brass. With annular groove and lubrication holes in the outer ring (fig 7).

BC4.7 design

Two outer rings each with three integral flanges. Two inner rings. Two roller guided double pronged cages of brass. With or without annular groove and/or lubrication holes in the outer rings (fig 8).

BC4.8 design

Two outer rings each with an integral central flange and two loose flange rings; one intermediate ring. Two inner rings. Two roller guided double pronged machined brass cages. With or without annular groove and/or lubrication holes in the outer rings (fig 9).

BC4.9 design

Two outer rings each with three integral flanges. Two inner rings. Pierced rollers and four pin-type cages of steel or brass. With or without annular groove and/or lubrication holes in the outer rings (fig 10).

BC4.10 design

Two outer rings each with an integral central flange and two loose flange rings; one intermediate ring. Two inner rings. Pierced rollers and four pin-type cages of steel or brass. With or without annular groove and/or lubrication holes in the outer rings (fig 11).

BC4.11 design

Two single row outer rings each with one integral flange and one double row outer ring with integral central flange and two intermediate rings. Two inner rings. Pierced rollers and four pin-type cages of steel (fig 12).

BC4.12 design

Two outer rings each with an integral central flange and two loose flange rings; one intermediate ring. Two inner rings. Four pressed steel cages. With or without annular groove and/or lubrication holes in the outer rings (fig 13).

BC4.13 design

Two outer rings each with two integral flanges. Two inner rings. Two double row window-type machined brass cages (two rollers per cage pocket) (fig 14).

BC4.14 design

Two outer rings each with an integral central flange and two loose flange rings; one intermediate ring. Four inner rings. Pierced rollers and four pin-type cages of steel or brass. With or without annular groove and lubrication holes in the outer rings (fig 15).

BC4.15 design

Two flangeless outer rings. Two inner rings each with three integral flanges. Pierced rollers and four pin-type cages of steel. With lubrication holes in the outer rings (fig 16).

BC4.16 design

One outer ring with three loose guide rings and two loose flange rings. One extended inner ring. Two roller guided double pronged machined brass cages. With or without annular groove and/or lubrication holes in the outer ring (fig 17).

BC4.17 design

Two outer rings each with three integral flanges. Two inner rings, one of which is extended. Two roller guided double pronged machined brass cages. With or without annular groove and/or lubrication holes in the outer rings (fig 18).

BC4.18 design

Two outer rings each with an integral central flange and two loose flange rings; one intermediate ring. Two inner rings, one of which is extended. Two roller guided double pronged machined brass cages. With or without annular groove and/or lubrication holes in the outer rings (fig 19).

BC4.19 design

Two outer rings each with an integral central flange and two loose flange rings; one intermediate ring. Two inner rings, one of which is extended. Pierced rollers and four steel pin-type cages. With or without annular groove and/or lubrication holes in the outer rings (fig 20).

BC4.20 design

Two outer rings each with an integral central flange and two loose flange rings; one intermediate ring. Two inner rings, one of which is extended and has a concentric shoulder. Pierced rollers and four steel pin-type cages. With annular groove and lubrication holes in the outer rings (fig 21).

BC4.21 design

Two outer rings each with an integral central flange and two loose flange rings; one intermediate ring. Two extended inner rings, one of which has a concentric shoulder. Pierced rollers and four steel pin-type cages. With annular groove and lubrication holes in the outer rings (fig 22).
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