Aktiebolaget Skf

Fabio Cavacece

Fausto Baracca

Andrea A Bertolini

Pasquale Frezza

Fabio Falaschi

Alessio Nebbia Colomba

Ettore Bertelloni

A bearing unit with rolling bodies for use in the food and beverage industry, for example, is disclosed herein. The example embodiments disclosed herein provide that of a bearing unit comprising a radially inner ring including a stainless steel collar with a raceway, on which two sleeves made of reinforced polymeric material are co-molded on opposite sides. Such example embodiments incorporate corrosion resistance properties of a polymeric material without losing the surface hardness properties. As such, the radially inner ring of the bearing unit offers same nominal load values as inner rings are made entirely of metal, but with better corrosion resistance without losing the surface hardness properties.

Bearing unit with rolling bodies with a co-molded inner ring

A bearing unit includes a radially outer ring having seats formed in a radially inner surface thereof, a radially inner ring, a row of rolling bodies, and at least one sealing device interposed between the rings. Each sealing device includes a shaped shield, an elastomer coating overmolded on the shaped shield, and an anchorage formed on the elastomer coating. The anchorage includes a radially external anchoring lip received by the seat of the radially outer ring that includes a root portion and a projection distal to the root portion. The anchorage also includes an annular cavity formed on a radially internal side thereof, where an axial length of the annular cavity is greater than an axial length of the projection and the anchoring lip is flexed radially inward and at least partially fills the annular cavity.

Bearing unit with rolling bodies

A support assembly for a moveable, rotating, or sliding shaft includes a casing and a cover. The casing includes a front edge defining an opening and a radially external lateral surface having an annular seat. The annular seat includes an annular groove axially spaced from the front edge and connected to a number of axial grooves that interrupt at least part of the front edge. The cover includes an annular coupling portion extending toward the radially external lateral surface of the casing. The annular coupling includes at least one pair of teeth formed on a radially inside surface of the annular coupling portion and projecting radially inward, each pair of teeth spaced circumferentially from each other, and a plurality of radially internal projections. A bottom wall of the annular groove includes a plurality of depressions alternating with a plurality of projections.

Support assembly for food applications having an improved seal

A support assembly for moving shafts, comprising a bearing unit positioned in a casing, and a cover for fluid sealing the casing. The support assembly comprises double level of protection provided by two distinct sealing devices that keep the bearing unit protected from washing liquid even in the most demanding conditions of use. The better sealing configuration aids in overall better sealing of the bearing unit; greater resistance to contaminants; and improving the sealing performance of the whole support assembly.

Support assembly for food applications

A bearing unit for a marble cutting machine has a radially outer ring, rotatable with respect to an axis of rotation (X) and is provided with a radially outer flange portion. Additionally, the bearing unit is provided with a stationary radially inner ring with a through hole in which the ratio between a dimension of an internal diameter (D) of the through hole and a dimension of the axial thickness (T) of the radially inner ring is between about 6.7 and about 11.1. A row of rolling bodies is interposed between the radially outer ring and the radially inner ring. A sealing shield is made of composite material and interposed between the radially inner ring and the radially outer ring, rotatable with respect to the rotation axis (X) and steadily anchored to the radially outer ring. The shield is provided with a sensor molded in it.

Bearing unit with sensorized shield

A sealing device for a sleeve of washing machines, comprising a first, stationary, annular screen, and a second, rotatable, annular screen. The first annular screen includes a first cylindrical mounting portion and a first flange portion; and the second annular screen includes a second cylindrical mounting portion and a second flange portion. The sealing device is characterized in that both the first and the second annular screens include the same number of non-contacting sealing lips, which are similar to each other and contained axially between the first and second flange portions, in radially alternating positions axially arranged one above the other, so as to define a sealing labyrinth (L). The first and second annular screens define between them a discharge chamber (C) and an obstruction chamber (C) which are arranged along the sealing labyrinth (L), substantially at opposite ends of the said sealing labyrinth (L).

Sealing device for washing machine sleeves

A sealing system includes a casing with an internal seat, a front edge, an opening, and a radially external lateral surface defining an annular seat. The annular seat includes an annular groove axially spaced from the front edge, itself including one or more mechanical stops, and a plurality of axial grooves connected to the annular groove and interrupting radially at least part of the front edge. The annular groove defines a bottom wall provided with projections spaced from one another and defining depressions, the projections circumferentially offset from the axial grooves. The sealing system further includes a cover with a bottom wall and an annular coupling portion. A radially inner surface of the annular coupling portion includes teeth projecting radially inward and spaced circumferentially from each other. The annular seat is configured to receive the at least one pair of teeth of the annular coupling portion of the cover.

Fastening for a support assembly for food applications

A bearing unit comprising a stationary radially outer ring with a spherical radially outer surface with a convex shape; a radially inner ring that is rotary about a central rotation axis of the bearing unit and is mounted on a rotating or oscillating shaft in which a diametrical through-hole formed in a first cylindrical portion is used to receive an elastic element for locking the radially inner ring on the shaft; a plurality of rolling bodies interposed between the radially outer ring and the radially inner ring to enable the relative rotation of the two rings; and at least one element for locking the radially inner ring on the shaft in which a pair of threaded through-holes formed in either the first cylindrical portion or the second cylindrical portion of the radially inner ring is used to receive respective grub screws for locking the radially inner ring on the shaft.

Bearing unit for windrowers

Casing of a bearing unit for food applications, made of polymeric material and provided internally with a spherical seat for housing the bearing unit, the casing having a reinforcement in the form of a metal ring co-molded inside the casing and accommodated around the spherical seat of the casing.

Reinforced casing for food applications

A bearing unit comprising a stationary radially outer ring with a spherical radially outer surface with a convex shape, a radially inner ring that is rotary about a central rotation axis (X) of the bearing unit and is mounted on a rotating or oscillating shaft. A diametrical through-hole is formed in a first cylindrical portion that is used to receive an elastic element for locking the radially inner ring on the shaft, a plurality of rolling bodies interposed between the radially outer ring and the radially inner ring to enable the relative rotation of the two rings, and a locking element locking the radially inner ring on the shaft. The radially inner ring is provided with two threaded through-holes from opposite sides with respect to the radially outer ring and to the rolling bodies, for housing respective grub screws for locking the radially inner ring on the shaft.

A bearing unit including a radially outer ring, a radially inner ring, a row of rolling bodies interposed between the radially outer ring and the radially inner ring, a containment cage for keeping the rolling bodies in position defined by a plurality of arched bridges and a plurality of flattened connecting elements interposed between the bridges, a sealing screen interposed between the radially inner ring and the radially outer ring made of composite material provided with an annular central portion having a toroidal surface, a radially inner lug, and a radially outer deflector projecting towards the cage, and a channel between the cage and the sealing screen, axially defined by the lug, the toroidal surface, and the deflector.

Bearing unit

A bearing unit comprising a radially outer ring having a radially outer spherical surface with a convex shape, a radially inner ring mounted on a rotating or oscillating shaft, and a plurality of rolling bodies interposed between the radially outer ring and the radially inner ring to allow the relative rotation of the radially inner ring and outer ring; a locking system for locking the bearing unit being provided with two threaded through holes that are made through the radially inner ring from opposite sides with respect to the radially outer ring and to the plurality of rolling bodies, and, for each threaded through hole with a respective grub screw locking the radially inner ring on the shaft.

Thermal analysis of a bearing unit, carried out by entering the input and boundary conditions of the application, defining contact areas and load distribution between components of the bearing unit, calculating the conduction resistances and the thermal convection of the components, calculating the heat generated by friction between the components in contact and the heat distribution thereof on a plurality of isothermal nodes which discretize the bearing unit, defining a thermal interaction between the isothermal nodes, thermally balancing the isothermal nodes, calculating the temperature range of the bearing unit, comparing the resulting operating temperature on an isothermal node of a sealing means of the bearing unit and the related maximum allowable temperature, and if the operating temperature and maximum allowable temperature values are different from each other, repeat steps (a) to step (h).

Method of thermal analysis of a bearing unit

A support assembly for a movable shaft includes a bearing unit that receives the shaft, a casing, and a cover. The cover includes an annular coupling portion extending towards a radially external lateral surface of the casing. The annular coupling portion has circumferentially spaced teeth projecting from a radially inside surface thereof. The lateral surface includes an annular seat that receives the teeth. The annular seat includes an annular groove axially spaced with respect to a front edge of the casing that defines an opening of the casing and is connected to axial grooves that interrupt radially at least part of the front edge of the casing. A bottom wall of the annular groove has depressions alternating with projections offset with the axial grooves. The annular coupling portion includes radially internal projections that engage with the lateral surface of the casing along portions free of axial grooves.

Support assembly for movable, rotating or sliding shafts, having a bearing unit, a casing and a cover for fluid sealing an opening of an internal seat of the casing; the cover having an annular coupling portion towards a radially outer lateral surface of the casing, the annular coupling portion being provided radially on the inside with at least one pair of teeth projecting radially towards the inside of the cover and spaced circumferentially from each other;

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Rome, Italy

Fabio Cavacece