FR3061631A1 - DISC FOR AGRICULTURAL USE AND AN ASSEMBLY COMPRISING SUCH A DISK AND A BEARING - Google Patents

Abstract

A metal disc (2) for agricultural use according to the present invention is optionally curved. It presents: - a central zone (6), - a peripheral zone (4) intended to work a soil, - means for making a connection with a shaft (28) comprising a hollow housing (14) arranged in the central zone (6) and having a circular cylindrical peripheral wall (12). An assembly according to the invention comprises such a disc and a bearing disposed in the hollow recess and / or a shaft.

Description

© Publication number: 3,061,631 (to be used only for reproduction orders)

©) National registration number: 17 50184 ® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY

COURBEVOIE © Int Cl ⁸ : A 01 B 15/16 (2017.01), A 01 B 71/04, A 01 C 5/06

A1 PATENT APPLICATION

©) Date of filing: 09.01.17. © Applicant (s): FORGES DE NIAUX Company by (© Priority: simplified actions - FR. @ Inventor (s): PINEDA LAURENT. ©) Date of public availability of the request: 13.07.18 Bulletin 18/28. ©) List of documents cited in the report preliminary research: Refer to end of present booklet (© References to other national documents ©) Holder (s): FORGES DE NIAUX Joint-stock company related: simplified. ©) Extension request (s): © Agent (s): CABINET PLASSERAUD.

154) DISC FOR AGRICULTURAL USE AND AN ASSEMBLY COMPRISING SUCH A DISC AND A BEARING.

FR 3,061,631 - A1 (5 /) A metal disc (2) for agricultural use according to the present invention is optionally curved.

He introduces:

- a central zone (6),

- a peripheral zone (4) intended for working a soil,

- Means for making a connection with a shaft (28) comprising a recess (14) arranged in the central area (6) and having a circular cylindrical peripheral wall (12).

An assembly according to the invention comprises such a disc and a bearing disposed in the recessed housing and / or a shaft.

The present invention relates to a disc for agricultural use and to an assembly comprising such a disc and a bearing.

For preparing a soil, in particular before planting or after harvesting, it is known to use discs mounted on a chassis to form a set of discs, parallel or not, this chassis coming to be harnessed to a agricultural tractor, or the like. Several discs can be mounted integral with a pivoting shaft relative to the chassis or alternatively the discs can be mounted pivoting individually with respect to bearings. The term "disc" is used generically not only to designate tools of planar shape and circular contour but also for tools having a concave or wavy shape and / or having a peripheral edge with a crenellated shape, in the shape of waves. , etc.

The invention relates more particularly to the case where the disks are each pivotally mounted relative to a bearing. Document EP-3,090,612, for example, shows a plowing disc mounted on an arm by means of an axis of rotation and a bearing. A hub is then bolted to the center of the plowing disc and receives a bearing and an axis of rotation: the hub is thus fixed on the disc and the axis on the arm carrying the disc, at least one bearing connecting the axis to the hub .

In such an assembly, the hub and the shaft are generally machined apart and a mechanical assembly is attached to the disc. These operations are long and increase the cost price of the plowing disc.

The object of the present invention is therefore to provide a disc, of the plowing disc, seed drill disc or similar type with a simplified structure. Preferably, the cost price of a new disc will be lower than that of a comparable disc of the prior art.

To this end, the present invention provides a metal disc for agricultural use having a central zone with means for making a connection with a tree and a peripheral zone intended for working a soil.

According to the present invention, the means for making a connection with a tree comprise a hollow housing arranged in the central area and having a circular cylindrical peripheral wall.

The shape of such a disc is completely original. The housing with a circular cylindrical peripheral wall makes it possible to directly receive a bearing. It can be produced during the manufacture of the disc, most often by forging. It is thus unnecessary to provide machining operations in the central part of the disc in order to fix thereon a hub or the like making it possible to produce a bearing for a shaft. The bearing is in an original way directly carried out at the level of the disc.

As explained in the preamble, the term disc is the term usually used to designate a tillage tool of circular overall shape but of which, on the one hand, the peripheral edge is not necessarily circular (with slots, notches or others) and, on the other hand, the shape is not necessarily flat.

In a preferred embodiment, avoiding any machining, the hollow housing is closed at one end by a bottom. In this case, the disc advantageously has a shoulder between the circular cylindrical peripheral wall and the bottom. This shoulder defines a peripheral stop against which a bearing can come to rest.

An alternative embodiment provides that the bearing is mounted in the housing using a flange fixed to the peripheral zone.

To mechanically reinforce a disc as described above, it advantageously has ribs extending radially from the central zone towards the peripheral zone. Each rib is for example in the form of a boss of decreasing height away from the central area on one side of the peripheral area and advantageously comprises a corresponding hollow area on the other side of the peripheral area (this shape can also be easily made by forging).

The present invention also relates to an assembly formed by a disc and a bearing, in which the disc is a disc as described above and in which the bearing is arranged inside the recessed housing.

In such an assembly it can be provided in one embodiment that the bearing is mounted tight in its housing (for example by shrinking by heating the housing and / or by cooling the bearing, by tight fitting) or alternatively, the bearing can be stuck in its housing. An assembly can also be provided using a flange.

In such an assembly, according to a first variant in which the disk is a disk with a hollow housing closed at one end by a bottom and having a shoulder between the hollow housing and the bottom, then the assembly advantageously further comprises a shaft having a rod and a head with a diameter greater than that of the rod, and the rod can be mounted in the bearing while the head of the shaft is disposed between the shoulder and the bottom of said housing.

According to a second variant, an assembly as defined above further comprises a shaft having a rod and a head with a diameter greater than that of the rod, and the rod passes through a bottom of the housing by a bore produced in said bottom.

Details and advantages of the present invention will become more apparent from the description which follows, given with reference to the appended schematic drawing in which:

FIGS. 1 and 2 are two perspective views from different angles of view of an assembly formed by a disc, a bearing and a shaft,

FIG. 3 is a cross-sectional view on an enlarged scale of a central area of the assembly of FIGS. 1 and 2,

FIGS. 4 to 6 correspond to FIG. 3 for three alternative embodiments,

FIGS. 7 and 8 correspond to FIGS. 1 and 2 respectively for another alternative embodiment, and

FIG. 9 is a sectional view along the line of section IX-IX in FIG. 8 of the assembly illustrated in FIGS. 7 and 8.

FIG. 1 shows a disk 2 which has a flat peripheral zone 4 and a central zone 6.

Disc 2 is made of forged steel. It has a diameter of around 0.3 to 0.9 m (purely illustrative and not limiting) and is intended for agricultural use, for example for plowing, sowing and / or stubble cultivation. The outer edge 8 of the peripheral zone is adapted according to the work to be performed. As a nonlimiting illustrative example, the disc 2 illustrated here is a seed disc and it has a beveled edge over its entire periphery.

The disc 2 shown here has rotational symmetry with respect to an axis of revolution 10 extending perpendicular to the plane of the peripheral zone 4.

The outer edge 8 of the disc 2 could also be wavy, or crenellated. Similarly, the peripheral zone 4 is here flat but it could also be curved, for example, and form a cap. In these various embodiments, a person skilled in the art also knows how to define for the disc 2 an axis of revolution which corresponds to the axis around which the disc will be made to rotate for working the soil.

In summary, the shape of the peripheral zone can correspond to any form of peripheral zone known from a tool for agricultural use commonly called "disc".

The originality of the disc 2 illustrated in the figures is located in its central zone 6. The latter forms on one side of the disc 2 (FIG. 1) a boss while on the other side of the disc 2, there is a housing in corresponding hollow. The shape of the central zone 6 is better seen in FIGS. 3 to 6.

The central zone 6 has a side wall 12 which extends parallel to the axis of revolution 10 and thus forms a housing 14 having an inner peripheral wall 16 of circular cylindrical shape around the axis of revolution 10. This side wall 12 the peripheral zone 4 is attached by a rounded zone 18.

On the side opposite to the rounded area 18, the side wall is terminated by a shoulder 20 which forms a peripheral stop in the housing 14.

After the shoulder 20, the central zone 6 has a frustoconical part 22 closed by a bottom 24 (Figures 3 and 4). The frustoconical part 22 makes it possible to extend the housing 14. The bottom 24 comes to close the housing 14 and extends parallel to the peripheral zone 4 and / or perpendicular to the axis of revolution 10.

The central zone 6 as described above can be produced by forging, during the manufacture of the disc, without using other manufacturing processes. It is of a size suitable for directly receiving a bearing 26 and thus serving as a bearing for a shaft 28.

The bearing 26 can be mounted directly in the housing 14 and its peripheral outer wall can be directly in contact with the inner peripheral wall 16 of the side wall 12. In this case, provision may be made, for example, to mount the bearing 26 by hooping or tight fitting.

According to another embodiment, the bearing 26 can be glued in the housing 14. Special glues known to those skilled in the art are designed for such applications and make it possible to withstand high stresses. Before making such a bonding, machining of the inner peripheral wall 16 can be envisaged.

The shaft 28 has a rod 30 and a head 32. The external diameter of the rod 30 and the bearing 26 are adapted to each other. The free end of the rod 30, opposite the head 32, is for example threaded to allow it to be mounted on a frame, an arm, or the like. The thread of the rod 30 is not illustrated in the figures. The head 32 of the shaft 28 has an outside diameter greater than that of the rod 30. In the assembly illustrated in FIG. 3, the head 32 abuts against the bearing 26 and is disposed in the housing 14 at the level of the frustoconical part 22 of the central zone 6, between the bearing 26 and the bottom 24.

The variant embodiment of FIG. 4 illustrates the mounting of the bearing 26 with a flange 34. The latter can be fixed, for example by means of bolts or rivets, to the peripheral zone 4, around the central zone 6, and traps the bearing 26 in the housing 14 while keeping it in abutment on the shoulder 20. This flange 34 is for example to be provided in cases where strong stresses are exerted on the disc 2.

While in the embodiments of Figures 1 to 4 the bottom 24 of the housing 14 is closed, the embodiments illustrated in Figures 5 and 6 have a bottom 24 'open. Indeed, a bore 25 centered on the axis of revolution 10 is made in order to allow the passage of the rod 30 of the shaft 28. The head 32 of the shaft 28 is here no longer at the bottom of the housing 14 but at the entrance to it.

While in the embodiment of FIG. 5, the bearing 26 is mounted in its housing by gluing, shrinking, tight fitting or the like, the embodiment of FIG. 6 takes up an assembly using the flange 34 illustrated on Figure 4.

As will be apparent to a person skilled in the art, in the variant embodiments of FIGS. 5 and 6, the frustoconical part 22 can be omitted. These embodiments are not illustrated in the drawing.

FIGS. 7 to 9 illustrate another alternative embodiment of the assembly of FIGS. 1 to 3. In this alternative embodiment, ribs 36 are produced around the central zone 6 to reinforce the disc 2 at the level of the folding between the peripheral zone 4 and central zone 6.

The ribs 36 are produced during the forging of the disc 2 by deformation of the latter. These ribs 36 thus each form a boss on the face of the disc from which the central zone 6 projects and form a hollow of corresponding shape on the other face of the disc 2. Each rib thus appears as a dihedral. The height of the boss formed by the rib 36 decreases as it moves away from the central zone 6.

The ribs are preferably regularly arranged around the central zone 6. The embodiment of Figures 7 to 9 provides six ribs 36 extending radially. However, another number of ribs, preferably greater than or equal to 3, can be provided.

Figure 9 illustrates an assembly of the bearing 26 in its housing similar to that illustrated in Figure 3 for the first embodiment. However, in the case of discs subjected to high mechanical stresses tending to cause the bearing 26 to come out of its housing, mounting using a flange can also be envisaged as illustrated in FIG. 4 (or 6). Likewise, a ribbed disc (FIGS. 7 to 9) can also be combined with the embodiments of FIGS. 5 and 6 (shaft 28 passing through the bottom of the bearing housing).

As is apparent from the foregoing description, a disc itself can be produced only by forging without having to provide for subsequent machining operations (milling, reaming, etc.) in order to mount thereon a hub or the like receiving a bearing to allow the disc to rotate freely around a shaft.

Thus, using a disc as described above, machining operations are eliminated. In addition, the number of parts is limited since a bearing can be directly fixed in the disc, without having to provide a hub, or a cage, separate which has just been fixed by bolts on the disc.

All this makes it possible to significantly limit the cost price of an assembly intended to be mounted on a tree and comprising a disc for agricultural use.

The present invention is not limited to the embodiments described above by way of nonlimiting examples and to the variants mentioned. It also relates to embodiments within the reach of those skilled in the art within the scope of the claims below.

Claims (5)

1. Metallic disc (2) for agricultural use having a central zone (6) with means for making a connection with a tree (28) and a peripheral zone (4) intended for working a soil, 5 characterized in that the means for making a connection with a shaft (28) comprise a recess (14) arranged in the central zone (6) and having a circular cylindrical peripheral wall (12). 2. Disc according to claim 1, characterized in that the recess (14) is closed at one end by a bottom (24), and has a 10 shoulder (20) between the circular cylindrical peripheral wall (12) and the bottom (24). 3. Disc according to one of claims 1 to 2, characterized in that it has ribs (36) extending radially from the central zone (6) towards the peripheral zone ( 4). 15 4. Disc according to claim 3, characterized in that each rib (36) is in the form of a boss of decreasing height away from the central area (6) on one side of the peripheral area (4 ) and has a corresponding hollow zone on the other face of the peripheral zone (4). 20 5. Assembly formed by a disc (2) and a bearing (26), characterized in that the disc (2) is a disc according to one of claims 1 to 4 and in that the bearing (26 ) is arranged inside the recess (14). 6. An assembly according to claim 5, characterized in that the bearing (26) is mounted tight in its housing. 25 7. The assembly of claim 5, characterized in that the bearing (26) is glued in its housing. 8. An assembly according to claim 5, characterized in that the bearing (26) is mounted in the housing (14) using a flange (34) fixed to the peripheral zone (4). 9. Assembly according to one of claims 5 to 8, characterized in that the disc (2) is a disc according to claim 2, in that the assembly further comprises a shaft (28) having a rod (30 ) and a head (32) of diameter greater than that of the rod, and in that the rod (30) is mounted in the bearing (26) while the head (32) of the shaft is disposed between the shoulder (20) and the bottom (24) of the housing. 10. Assembly according to one of claims 5 to 8, characterized in that it further comprises a shaft (28) having a rod (30) and a head (32) 5 of diameter greater than that of the rod (30), and in that the rod passes through a bottom (24 ’) of the housing by a bore (25) produced in said bottom (24’). 1/9