Title of Invention	"A HUB-BEARING ASSEMBLY FOR SOIL-WORKING DISCS"
Abstract	The invention relates to a rotating, disc-shaped, agricultural tool (1) which is mounted in a frame (34) of a machine via a hub and a bearing arrangement. The bearing arrangement is distinguished by the fact that it is formed from two angular roller bearings (2, 3) which are set in back-to-back arrangement and whose raceways are arranged inclined at an angle () to a bearing axis (12), wherein a space (36) accommodating the angular roller bearings (2, 3) is defined on the outside in the radial direction by a hub body (17), of V-shaped design in its centre part and having contact surfaces (19, 20), and on the inside in the radial direction by a supporting ring (25) having spaced-apart contact surfaces (26, 27) on both sides in the axial direc...

Title of Invention

"A HUB-BEARING ASSEMBLY FOR SOIL-WORKING DISCS"

Abstract

The invention relates to a rotating, disc-shaped, agricultural tool (1) which is mounted in a frame (34) of a machine via a hub and a bearing arrangement. The bearing arrangement is distinguished by the fact that it is formed from two angular roller bearings (2, 3) which are set in back-to-back arrangement and whose raceways are arranged inclined at an angle () to a bearing axis (12), wherein a space (36) accommodating the angular roller bearings (2, 3) is defined on the outside in the radial direction by a hub body (17), of V-shaped design in its centre part and having contact surfaces (19, 20), and on the inside in the radial direction by a supporting ring (25) having spaced-apart contact surfaces (26, 27) on both sides in the axial direc...

Full Text	A hub-bearing assembly for soil-working discs The present invention refers to a hub-bearing assembly for a soil working disc, particularly a tilling disc. These discs are usually arranged side to side on respective axles projecting from the frame of the plough or another similar agricultural machine. Each disc is rotatably mounted by means of a hub-bearing unit comprised of one or two stationary, radially inner races, fixed on a central axle projecting from an arm of the agricultural machine frame, a radially outer race which is integral with a radial outer flange for mounting the disc, and a dual set of balls interposed between the inner and outer races. The inner races, and therefore the whole bearing unit, are axially locked against a shoulder of the axle by tightening a ring nut screwed on the free outer end of the axle. See, for example, EP-B-1 326 489. In order to prevent contaminants (water, mud, soil) from entering the bearing from the side opposite to that where the disc is mounted, i.e. on the side facing the arm of the frame, some bearing units have been equipped with sealing devices having sealing lips slidingly contacting interface shields. The sealing devices used heretofore have not proven to guarantee efficient sealing for long enough time, particularly if the locking nut is slightly unscrewed or loose. Efficient sealing action is of primary importance for correct operation of the disc over an acceptable period of time. Since the contamination conditions are extreme, contaminants entering the inner parts of the bearing may rapidly lead to the locking of a disc, consequently reducing productivity. In some cases the entering of contaminants is due to the locking nut being partially unscrewed on the free end of the axle. Also, an efficient sealing action able to prevent leakage of lubricant out of the bearing is of primary importance for the protection of the environment, in order to prevent pollution of the soil by the lubricant. The performance and life of sealing devices are also limited by metal wires that are used for tying up rolled bales and that are left on the field. These wires are inevitably picked up by the discs and tightly wound around the hubs, forming rather thick coils. The same wires, tangled around and beside the sealing device may destabilize it or move part of it so that the lips of the sealing device are no longer correctly positioned on the respective interface surfaces. It is a general object of this invention to provide a highly reliable hub-bearing assembly allowing servicing to become less frequent, also under heavy duty conditions. A particular object of the invention is to guarantee sealing action with time against external contaminants. Another object of the invention is to provide an assembly having a reduced axial bulk, allowing to bring the discs nearer to one another and therefore increase, on a same agricultural machine, the number of discs, without adversely affecting the performance of the sealing devices. These and other objects and advantages, which will be better understood in the following, are achieved according to the invention by a hub-bearing assembly having the features defined in claim 1. According to another aspect, the invention provides an assembly as defined in claim 14. Preferred embodiments of the invention are set forth in the dependent claims. A few preferred, but not limiting embodiments of the invention will now be described, reference being made to the appended drawings, in which: fig. 1 is an axial cross-sectional view of a first embodiment of a hub-bearing assembly according to the invention, which rotatably supports a soil working disc on an axle projecting from an arm of an agricultural machine; fig. 2 is an enlarged view of a detail of fig. 1; figs. 3 and 4 are views similar to figs. 1 and 2 showing a slightly different application of the hub-bearing assembly to the according to the invention; fig. 5 is an axial cross-sectional view of a second embodiment of a hub-bearing assembly according to the invention; figs. 6 and 7 are axial cross-sectional views of a third and a fourth embodiment of the invention. Referring initially to figure 1, a hub-bearing assembly for a soil working disc D comprises a hub-bearing unit, indicated overall at 10, and a cassette-type sealing device associated with the hub-bearing unit 10. The hub-bearing unit comprises a rotatable outer race 11 forming on one side a radial flange 12 for mounting the disc D by means of bolts B fitted in a number of axial bores 13. A dual set of bearing balls 14, 15 is interposed between the outer race 11 and a pair of inner races 16, 17 tightly mounted side to side on a central axle A projecting from an arm E of the frame of an agricultural machine. The inner races 16, 17 are axially clamped in position against a shoulder S of the axle by means of a ring nut G screwed on the free end of axle A. On the side facing the disc D, an O-ring gasket 18 is accommodated in a circular groove 19 and pressed between the outer race 11 and the disc D for ensuring sealing action against contaminants accessing the inner parts of the bearing. Furthermore, the sealing action is improved by a cap C which closes the outer race 11 on the side of disc D. The cassette sealing device 20 is fitted on the side of the unit 10 opposite to that where the disc D is located. The sealing device 20 consists of a rotatable part and a stationary part. As shown more clearly in figure 2, the rotatable part, secured to the outer race 11, comprises a metal sheet ring 21, called "flinger", having a substantially L-shaped axial cross section, with an outer cylindrical axial wall 22 and a radial wall 23 extending towards the axis of rotation x. Fixed to the zone of the inner peripheral edge 24 of the wall 23 is a gasket 25 of elastic material forming a radial sealing lip 26 and an elongate axial sealing lip 27. It should be noted that in the appended drawings the elastic gaskets are depicted in their non-deformed condition. The stationary part of the sealing device is fixable to the central axle A and includes a metal shield 28 having a substantially C-shaped axial cross section with an inner cylindrical wall 29 engaged by the lip 26, a radial wall 30 against which the end of the elongate lip 27 slides, and a cylindrical wall 31 coaxially outer with respect to the wall 29. On the outer cylindrical wall 31 there is fixed a gasket 32 of elastic material forming a set of parallel radial lips 33 (three in the illustrated example) which slide against the cylindrical wall 22 of the flinger 21. It will be noted that, owing to the above arrangement, the lips of the two gaskets of the sealing device 20 are substantially co-planar, i.e. they are contained in a very narrow axial space, which gives the sealing device and overall compact size and, consequently, contributes to reduce the axial size of the assembly as a whole. By way of indication, a hub-bearing assembly according to the invention allows to reduce the bulk by about 10% with respect to conventional assemblies, and therefore, allows to increase the number of discs in an agricultural machine and improve its efficiency. Experimental tests carried out by the applicant have shown that the sealing device 20 performs an efficient action also in case the ring nut G is partly unscrewed, in a condition where the assembly has acquired an axial play of 1-2 mm with respect to the supporting axle A. The axially compact arrangement allows to add a side shield 39 in the form of an annular disc that is fixed to the axle A near the sealing device 20. The side shield 39 cooperates with the sealing device 20 performing an additional labyrinth sealing action and protecting the sealing device 20. In the embodiments shown in figures 1-4, the sealing device 20 is mounted on the outer race 11 of the hub-bearing unit 10 by means of an outer collar 34. Internally, the collar 34 has an enlarged side seat 37 in which the flinger 21 is forcefully fitted. On the outside, the flinger as a conical surface 35 that tapers towards the flange 12 and ends flush with the cylindrical outer surface of the race 11. The collar 34 is forcefully fitted in a recess or seat 36 formed in the outer surface of the race 11 towards the side opposite to that of the flange 12. The embodiment shown in figs. 3 and 4 differs from that of figs. 1 and 2 in the different shape of the axle A, which allows to mount a flat disc D, and in that the side shield 39 has a L-shaped axial cross section. The stationary part of the sealing device 20 is fixable on the cylindrical part of the shield 39. In the embodiments of figs. 5, 6 and 7, the sealing device 20 is mounted directly in the outer race 11, in a recess or seat 37 formed in the inner surface of the race 11 towards the side opposite to that of flange 12. In the example of figure 5, the outer race 11 is made of metal sheet. The embodiment of fig. 6 resembles that of figs. 1 and 2, except for the outer race 11 extending axially at the side opposite that of flange 12 so as to directly form the seat 37 for the sealing device. A side shield 39 having a differently shaped cross section is shown in fig. 6. The outer race 11 in the embodiment of fig. 7 is similar to that of fig.6, whereas the side shield 39 shown in fig. 7 resembles that of figs. 3 and 4. An important feature of the present invention is that the radially outer surface of the hub-bearing assembly has a central zone 38, intermediate the side of the flange 12 and the opposite side where the sealing device 20 is mounted, which is radially recessed. The recessed zone 38 serves as a preferential seat where the wires picked up during use of the agricultural machine are conveyed and wound. These wires are so wound in a zone which is spaced from the side of the sealing device, and therefore do not adversely affect its correct operation. In other words, a channel open in a radially outer direction is formed around the hub, where the said metal wires are conveyed and wound. It will be observed that in the embodiment of figs. 1 and 3, the radially recessed zone 38 of the outer surface of the assembly is partly formed by the outer cylindrical surface of the outer bearing race 11, and partly by the conical surface 35 of collar 34. In the embodiments of figs. 5 to 7, the recessed zone 38 is instead entirely formed by the outer race 11. The invention is not intended to be limited to the embodiments described and illustrated herein, which should be considered as examples of the assembly; rather, the invention may be modified with regard to the shape and arrangement of parts, and to constructional and functional details, as will be apparent to those skilled in the art. CLAIMS 1. A hub-bearing assembly for rotatably mounting a soil-working disc (D) on a supporting axle (A) of an agricultural machine, the assembly comprising: a hub-bearing unit (10) with a radially outer, rotatable outer race (11) from one side of which a flange (12) radially extends for mounting a disc (D), and a sealing device (20) mounted on a side of the hub-bearing unit (10) opposite to the side of the flange (12), characterised in that the radially outer surface of the assembly has a portion (38), intermediate the flange (12) and the side of the sealing device (20), which is radially recessed so as to serve as a preferential seat for winding wires picked up from the fields during use of the agricultural machine. 2. The assembly of claim 1, characterised in that the sealing device (20) comprises a rotatable part, secured to the outer race (11), and a stationary part, each of said parts having a shield (21, 28) carrying a respective gasket of elastic material (25, 32) with at least one respective sealing lip (26, 27; 33), wherein the two gaskets are concentric and substantially co-planar. 3. The assembly of claim 2, characterised in that the rotatable part of the sealing device (20) comprises a shield (21) having a substantially L-shaped axial cross section, with an outer cylindrical axial wall (22) and a radial wall (23) extending towards the axis of rotation (x) of the assembly; fixed to the radial wall (23) is an elastic gasket (25) forming a radial sealing lip (26) and an elongate axial sealing lip (27); the stationary part of the sealing device is fixable to the central axle (A) and includes a shield (28) having a substantially C-shaped axial cross section with an inner cylindrical wall (29) engaged by the radial lip (26), a radial wall (30) against which the end of the elongate lip (27) slides, and a cylindrical wall (31) coaxially outer with respect to the inner cylindrical wall (29), wherein fixed on the outer cylindrical wall (31) is the elastic gasket (32) which forms a set of parallel radial lips (33) sliding against the cylindrical wall (22) of the rotatable shield (21). 4. The assembly of any one of claims 1 to 3, characterised in that the sealing device (20) is mounted on the outer race (11) by means of an outer collar (34) having an outer surface (35) which tapers towards the flange (12) and which concurs in defining the radially recessed portion (38) of the outer surface of the assembly. 5. The assembly of claim 4, characterised in that the tapered surface (35) ends flush with an outer cylindrical surface of the outer bearing race (11). 6. The assembly of claim 4 or 5, characterised in that the tapered surface (35) is a conical surface. 7. The assembly of any one of claims 1 to 3, characterised in that the sealing device (20) is mounted directly in the outer bearing race (11). 8. The assembly of any one of claims 1 to 3, characterised in that said radially recessed outer portion (38) of the radially outer surface of the assembly is entirely formed by the outer race (11) of the bearing unit. 9. The assembly of claim 7 or 8, characterised in that the outer race (11) is made of metal sheet. 10. The assembly of any one of the preceding claims, characterised in that the radially recessed zone or portion (38) has the general shape of a channel open in a radially outer direction. 11. The assembly of any one of the preceding claims, characterised by further comprising a lateral annular shield (39) mountable on the axle (A) near the sealing device (20) and cooperating therewith for performing a further labyrinth sealing action. 12. The assembly of claim 11, characterised in that the side shield (39) has a L-shaped axial cross section and that a stationary part of the sealing device (20) is fixable on the central axle (A) by means of the side shield (39). 13. The assembly of claim 11, characterised in that the side shield (39) has the shape of an annular disc. 14. An assembly comprising a soil-working disc (D) mounted to a radial flange (12) extending from one side of a rotatable outer race (11) of a hub-bearing unit (10), and a sealing device (20) mounted on a side of the hub-bearing unit (10) opposite to the side of the flange (12), characterised in that a radially outer surface of the assembly has a portion (38), intermediate the flange (12) and the side of the sealing device (20), which is radially recessed so as to serve as a preferential seat for winding wires picked up from the fields during use of the agricultural machine.

Full Text

A hub-bearing assembly for soil-working discs
The present invention refers to a hub-bearing assembly for a soil working disc, particularly a tilling disc.
These discs are usually arranged side to side on respective axles projecting from the frame of the plough or another similar agricultural machine. Each disc is rotatably mounted by means of a hub-bearing unit comprised of one or two stationary, radially inner races, fixed on a central axle projecting from an arm of the agricultural machine frame, a radially outer race which is integral with a radial outer flange for mounting the disc, and a dual set of balls interposed between the inner and outer races. The inner races, and therefore the whole bearing unit, are axially locked against a shoulder of the axle by tightening a ring nut screwed on the free outer end of the axle. See, for example, EP-B-1 326 489.
In order to prevent contaminants (water, mud, soil) from entering the bearing from the side opposite to that where the disc is mounted, i.e. on the side facing the arm of the frame, some bearing units have been equipped with sealing devices having sealing lips slidingly contacting interface shields. The sealing devices used heretofore have not proven to guarantee efficient sealing for long enough time, particularly if the locking nut is slightly unscrewed or loose.
Efficient sealing action is of primary importance for correct operation of the disc over an acceptable period of time. Since the contamination conditions are extreme, contaminants entering the inner parts of the bearing may rapidly lead to the locking of a disc, consequently reducing productivity. In some cases the entering of contaminants is due to the locking nut being partially unscrewed on the free end of the axle. Also, an efficient sealing action able to prevent leakage of lubricant out of the bearing is of primary importance for the protection of the environment, in order to prevent pollution of the soil by the lubricant.
The performance and life of sealing devices are also limited by metal wires that are used for tying up rolled bales and that are left on the field. These wires are inevitably picked up
by the discs and tightly wound around the hubs, forming rather thick coils. The same wires, tangled around and beside the sealing device may destabilize it or move part of it so that the lips of the sealing device are no longer correctly positioned on the respective interface surfaces.
It is a general object of this invention to provide a highly reliable hub-bearing assembly allowing servicing to become less frequent, also under heavy duty conditions. A particular object of the invention is to guarantee sealing action with time against external contaminants. Another object of the invention is to provide an assembly having a reduced axial bulk, allowing to bring the discs nearer to one another and therefore increase, on a same agricultural machine, the number of discs, without adversely affecting the performance of the sealing devices.
These and other objects and advantages, which will be better understood in the following, are achieved according to the invention by a hub-bearing assembly having the features defined in claim 1. According to another aspect, the invention provides an assembly as defined in claim 14. Preferred embodiments of the invention are set forth in the dependent claims.
A few preferred, but not limiting embodiments of the invention will now be described, reference being made to the appended drawings, in which:
fig. 1 is an axial cross-sectional view of a first embodiment of a hub-bearing assembly according to the invention, which rotatably supports a soil working disc on an axle projecting from an arm of an agricultural machine;
fig. 2 is an enlarged view of a detail of fig. 1;
figs. 3 and 4 are views similar to figs. 1 and 2 showing a slightly different application of the hub-bearing assembly to the according to the invention;
fig. 5 is an axial cross-sectional view of a second embodiment of a hub-bearing assembly according to the invention;
figs. 6 and 7 are axial cross-sectional views of a third and a fourth embodiment of the invention.
Referring initially to figure 1, a hub-bearing assembly for a soil working disc D comprises a hub-bearing unit, indicated overall at 10, and a cassette-type sealing device associated with the hub-bearing unit 10.
The hub-bearing unit comprises a rotatable outer race 11 forming on one side a radial flange 12 for mounting the disc D by means of bolts B fitted in a number of axial bores 13. A dual set of bearing balls 14, 15 is interposed between the outer race 11 and a pair of inner races 16, 17 tightly mounted side to side on a central axle A projecting from an arm E of the frame of an agricultural machine. The inner races 16, 17 are axially clamped in position against a shoulder S of the axle by means of a ring nut G screwed on the free end of axle A. On the side facing the disc D, an O-ring gasket 18 is accommodated in a circular groove 19 and pressed between the outer race 11 and the disc D for ensuring sealing action against contaminants accessing the inner parts of the bearing. Furthermore, the sealing action is improved by a cap C which closes the outer race 11 on the side of disc D.
The cassette sealing device 20 is fitted on the side of the unit 10 opposite to that where the disc D is located. The sealing device 20 consists of a rotatable part and a stationary part. As shown more clearly in figure 2, the rotatable part, secured to the outer race 11, comprises a metal sheet ring 21, called "flinger", having a substantially L-shaped axial cross section, with an outer cylindrical axial wall 22 and a radial wall 23 extending towards the axis of rotation x. Fixed to the zone of the inner peripheral edge 24 of the wall 23 is a gasket 25 of elastic material forming a radial sealing lip 26 and an elongate axial sealing lip 27. It should be noted that in the appended drawings the elastic gaskets are depicted in their non-deformed condition. The stationary part of the sealing device is fixable to the central axle A and includes a metal shield 28 having a substantially C-shaped axial cross section with an inner cylindrical wall 29 engaged by the lip 26, a radial wall 30 against which the end of the elongate lip 27 slides, and a cylindrical wall 31 coaxially outer with respect to the wall 29. On the outer cylindrical wall 31 there is fixed a gasket 32 of elastic material forming a set of parallel radial lips 33 (three in the illustrated example) which slide against the cylindrical wall 22 of the flinger 21.
It will be noted that, owing to the above arrangement, the lips of the two gaskets of the sealing device 20 are substantially co-planar, i.e. they are contained in a very narrow axial space, which gives the sealing device and overall compact size and, consequently, contributes to reduce the axial size of the assembly as a whole. By way of indication, a hub-bearing assembly according to the invention allows to reduce the bulk by about 10% with respect to conventional assemblies, and therefore, allows to increase the number of discs in an agricultural machine and improve its efficiency. Experimental tests carried out by the applicant have shown that the sealing device 20 performs an efficient action also in case the ring nut G is partly unscrewed, in a condition where the assembly has acquired an axial play of 1-2 mm with respect to the supporting axle A. The axially compact arrangement allows to add a side shield 39 in the form of an annular disc that is fixed to the axle A near the sealing device 20. The side shield 39 cooperates with the sealing device 20 performing an additional labyrinth sealing action and protecting the sealing device 20.
In the embodiments shown in figures 1-4, the sealing device 20 is mounted on the outer race 11 of the hub-bearing unit 10 by means of an outer collar 34. Internally, the collar 34 has an enlarged side seat 37 in which the flinger 21 is forcefully fitted. On the outside, the flinger as a conical surface 35 that tapers towards the flange 12 and ends flush with the cylindrical outer surface of the race 11. The collar 34 is forcefully fitted in a recess or seat 36 formed in the outer surface of the race 11 towards the side opposite to that of the flange 12.
The embodiment shown in figs. 3 and 4 differs from that of figs. 1 and 2 in the different shape of the axle A, which allows to mount a flat disc D, and in that the side shield 39 has a L-shaped axial cross section. The stationary part of the sealing device 20 is fixable on the cylindrical part of the shield 39.
In the embodiments of figs. 5, 6 and 7, the sealing device 20 is mounted directly in the outer race 11, in a recess or seat 37 formed in the inner surface of the race 11 towards the side opposite to that of flange 12. In the example of figure 5, the outer race 11 is made of metal sheet. The embodiment of fig. 6 resembles that of figs. 1 and 2, except for the outer race 11 extending axially at the side opposite that of flange 12 so as to directly form the
seat 37 for the sealing device. A side shield 39 having a differently shaped cross section is shown in fig. 6. The outer race 11 in the embodiment of fig. 7 is similar to that of fig.6, whereas the side shield 39 shown in fig. 7 resembles that of figs. 3 and 4.
An important feature of the present invention is that the radially outer surface of the hub-bearing assembly has a central zone 38, intermediate the side of the flange 12 and the opposite side where the sealing device 20 is mounted, which is radially recessed. The recessed zone 38 serves as a preferential seat where the wires picked up during use of the agricultural machine are conveyed and wound. These wires are so wound in a zone which is spaced from the side of the sealing device, and therefore do not adversely affect its correct operation. In other words, a channel open in a radially outer direction is formed around the hub, where the said metal wires are conveyed and wound.
It will be observed that in the embodiment of figs. 1 and 3, the radially recessed zone 38 of the outer surface of the assembly is partly formed by the outer cylindrical surface of the outer bearing race 11, and partly by the conical surface 35 of collar 34. In the embodiments of figs. 5 to 7, the recessed zone 38 is instead entirely formed by the outer race 11.
The invention is not intended to be limited to the embodiments described and illustrated herein, which should be considered as examples of the assembly; rather, the invention may be modified with regard to the shape and arrangement of parts, and to constructional and functional details, as will be apparent to those skilled in the art.

CLAIMS
1. A hub-bearing assembly for rotatably mounting a soil-working disc (D) on a
supporting axle (A) of an agricultural machine, the assembly comprising:
a hub-bearing unit (10) with a radially outer, rotatable outer race (11) from one side of which a flange (12) radially extends for mounting a disc (D), and
a sealing device (20) mounted on a side of the hub-bearing unit (10) opposite to the side of the flange (12),
characterised in that the radially outer surface of the assembly has a portion (38), intermediate the flange (12) and the side of the sealing device (20), which is radially recessed so as to serve as a preferential seat for winding wires picked up from the fields during use of the agricultural machine.
2. The assembly of claim 1, characterised in that
the sealing device (20) comprises a rotatable part, secured to the outer race (11), and a stationary part,
each of said parts having a shield (21, 28) carrying a respective gasket of elastic material (25, 32) with at least one respective sealing lip (26, 27; 33), wherein the two gaskets are concentric and substantially co-planar.
3. The assembly of claim 2, characterised in that
the rotatable part of the sealing device (20) comprises a shield (21) having a substantially L-shaped axial cross section, with an outer cylindrical axial wall (22) and a radial wall (23) extending towards the axis of rotation (x) of the assembly; fixed to the radial wall (23) is an elastic gasket (25) forming a radial sealing lip (26) and an elongate axial sealing lip (27);
the stationary part of the sealing device is fixable to the central axle (A) and includes a shield (28) having a substantially C-shaped axial cross section with an inner cylindrical wall (29) engaged by the radial lip (26), a radial wall (30) against which the end of the elongate lip (27) slides, and a cylindrical wall (31) coaxially outer with respect to the inner cylindrical wall (29), wherein fixed on the outer cylindrical wall (31) is the elastic
gasket (32) which forms a set of parallel radial lips (33) sliding against the cylindrical wall (22) of the rotatable shield (21).
4. The assembly of any one of claims 1 to 3, characterised in that the sealing device (20) is mounted on the outer race (11) by means of an outer collar (34) having an outer surface (35) which tapers towards the flange (12) and which concurs in defining the radially recessed portion (38) of the outer surface of the assembly.
5. The assembly of claim 4, characterised in that the tapered surface (35) ends flush with an outer cylindrical surface of the outer bearing race (11).
6. The assembly of claim 4 or 5, characterised in that the tapered surface (35) is a conical surface.
7. The assembly of any one of claims 1 to 3, characterised in that the sealing device (20) is mounted directly in the outer bearing race (11).
8. The assembly of any one of claims 1 to 3, characterised in that said radially recessed outer portion (38) of the radially outer surface of the assembly is entirely formed by the outer race (11) of the bearing unit.
9. The assembly of claim 7 or 8, characterised in that the outer race (11) is made of metal sheet.
10. The assembly of any one of the preceding claims, characterised in that the radially recessed zone or portion (38) has the general shape of a channel open in a radially outer direction.
11. The assembly of any one of the preceding claims, characterised by further comprising a lateral annular shield (39) mountable on the axle (A) near the sealing device (20) and cooperating therewith for performing a further labyrinth sealing action.
12. The assembly of claim 11, characterised in that the side shield (39) has a L-shaped axial cross section and that a stationary part of the sealing device (20) is fixable on the central axle (A) by means of the side shield (39).
13. The assembly of claim 11, characterised in that the side shield (39) has the shape of an annular disc.
14. An assembly comprising a soil-working disc (D) mounted to a radial flange (12) extending from one side of a rotatable outer race (11) of a hub-bearing unit (10), and a sealing device (20) mounted on a side of the hub-bearing unit (10) opposite to the side of the flange (12), characterised in that a radially outer surface of the assembly has a portion (38), intermediate the flange (12) and the side of the sealing device (20), which is radially recessed so as to serve as a preferential seat for winding wires picked up from the fields during use of the agricultural machine.

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Patent Number

277223

Indian Patent Application Number

2472/DELNP/2009

PG Journal Number

48/2016

Publication Date

18-Nov-2016

Grant Date

15-Nov-2016

Date of Filing

15-Apr-2009

Name of Patentee

AKTIEBOLAGET SKF

Applicant Address

415 50 GOTEBORG, SWEDEN.

Inventors:

#	Inventor's Name	Inventor's Address
1	OVE L. ANDERSSON	SORBOGARDSVAGEN 8, SE-44 196 ALINGSAS, SWEDEN.
2	LORENZO DELLAMORE	VIA DANTE ALIGHIERI 10, I-20016 PERO (MILANO0 ITALY.
3	GIANMARIO FADDA	VIA INGHILTERRA 11, I-10071 BARGARO, TORINESE, ITALY.
4	MAURIZIO GIOVANNELLI	VIALE KENNEDY 44, I-10042 NICHELINO, ITALY.
5	MAURO SASSI	STRADA GENOVA TER 131, I-10024 ONCVALIERI, ITALY.
6	STEFANO URSO	VIA DEI MILLE 4, I-10123 TORINO, ITALY.
7	WOLFGANG HUSSLEIN	ZIEGELWEINBERG 17, 97447 GEROLZHOFEN, GERMANY.
8	CRISTIAN CONCU	VIA BELLONO 14, I-10137 TORINO, ITALY.

PCT International Classification Number

A01B 71/04

PCT International Application Number

PCT/EP2007/051151

PCT International Filing date

2007-02-07

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	TO2006A000789	2006-11-06	Italy