FR3061631B1 - 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

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

For the preparation of a soil, especially before planting or after a harvest, it is known to use disks mounted on a frame to form a set of disks, parallel or otherwise, this frame coming to tackle a agricultural tractor, or the like. Several disks can be mounted integral with a pivoting shaft relative to the frame or the disks can be mounted pivoting individually relative to bearings. The term "disk" is used generically not only to designate tools of flat shape and circular contour but also for tools having a concave or undulating shape and / or having a peripheral edge with a crenellated shape, in the form of waves, etc. The invention relates more particularly to the case where the discs are each mounted pivoting relative to a bearing. Document EP-3,090,612, for example, shows a plowing disc mounted on an arm via an axis of rotation and a bearing. A hub is then bolted to the center of the plow 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 disk. These operations are long and increase the cost price of the plow disc.

The object of the present invention is therefore to provide a disk, of the plow disk type, seed drill disk or the like 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 area with means for making a connection with a shaft and a peripheral area for working a soil.

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

The shape of such a disc is quite original. The housing with a circular cylindrical peripheral wall makes it possible to directly receive a bearing. It can be realized during the manufacture of the disc, most often by forging. It is thus unnecessary to provide machining in the central portion of the disk to fix thereon a hub or the like to achieve a bearing for a shaft. The bearing is in an original way directly realized 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 global 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 machining, the hollow housing is closed at one end by a bottom. In this case, the disk 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 with a flange attached to the peripheral zone.

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

The present invention also relates to an assembly formed of a disc and a bearing, wherein the disc is a disc as described above and wherein the bearing is disposed within the recessed housing.

In such an assembly can be provided in one embodiment that the bearing is mounted tightly in its housing (for example by shrinking by heating the housing and / or cooling the bearing, by tight fitting) or alternatively, the bearing can be stuck in his dwelling. It can also provide a mounting with a flange.

In such an assembly, according to a first variant in which the disc is a disc with a hollow recess closed at one end by a bottom and having a shoulder between the recessed housing and the bottom, then the assembly advantageously further comprises a shaft having a rod and a head of 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 of diameter greater than that of the rod, and the rod passes through a bottom of the housing by a bore formed 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 according to different viewing angles of an assembly formed of a disc, a bearing and a shaft,

FIG. 3 is an enlarged cross-sectional view of a central zone of the set of FIGS. 1 and 2,

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

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

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

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

The disc 2 is made of forged steel. It has a diameter of the order of 0.3 to 0.9 m (purely illustrative and non-limiting data) and is intended for agricultural use, for example for plowing, seeding and / or stubble operations. 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 drill disc and has a bevelled edge on its entire periphery.

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

The outer edge 8 of the disc 2 could also be corrugated, or crenellated. Similarly, the peripheral zone 4 is here planar but it could also be for example curved and form a cap. In these various embodiments, those skilled in the art also know how to define for disk 2 an axis of revolution which corresponds to the axis around which the disk will be rotated for tillage.

In summary, the shape of the peripheral zone can correspond to any form of known peripheral zone of a tool for agricultural use commonly called "disk". The originality of the disc 2 illustrated in the figures is in its central zone 6. The latter forms a boss on one side of the disc 2 (FIG. 1) while on the other side of the disc 2 there is a housing corresponding hollow. The shape of the central zone 6 is best understood 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 is attached the peripheral zone 4 by a rounded zone 18.

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

After the shoulder 20, the central zone 6 has a frustoconical portion 22 closed by a bottom 24 (Figures 3 and 4). The frustoconical portion 22 extends the housing 14. The bottom 24 closes 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 made by forging, during the manufacture of the disc, without using other manufacturing processes. It is of suitable size to directly receive a bearing 26 and thus serve as a bearing on 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, it is possible for example to mount the bearing 26 by hooping or tight fitting.

According to another embodiment, the bearing 26 can be glued into the housing 14. Special glues known to those skilled in the art are designed for such applications and can 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 outer 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 its mounting on a frame, an arm, or the like. The threading of the rod 30 is not shown in the figures. The head 32 of the shaft 28 has an outer diameter greater than that of the rod 30. In the assembly illustrated in Figure 3, the head 32 abuts against the bearing 26 and is disposed in the housing 14 at the frustoconical portion 22 of the central zone 6, between the bearing 26 and the bottom 24.

The embodiment of Figure 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, on the peripheral zone 4, around the central zone 6, and comes to imprison the bearing 26 in the housing 14 by keeping it resting on the shoulder 20. This flange 34 is for example to be provided in cases where high stresses are exerted on the disk 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 an open bottom 24 '. Indeed, a bore 25 centered on the axis of revolution 10 is made to allow the passage of the shaft 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 of it.

While in the embodiment of Figure 5 the bearing 26 is mounted in its housing by gluing, shrinking, press fit or the like, the embodiment of Figure 6 resumes a mounting with the flange 34 shown on Figure 4.

As will be apparent to those skilled in the art, in the embodiments of Figures 5 and 6, the frustoconical portion 22 may be omitted. These embodiments are not illustrated in the drawing.

FIGS. 7 to 9 illustrate another variant embodiment of the set of FIGS. 1 to 3. In this variant embodiment, ribs 36 are made around the central zone 6 to reinforce the disk 2 at the level of the folding between the peripheral zone 4 and the central zone 6.

The ribs 36 are made during the forging of the disc 2 by deformation thereof. These ribs 36 thus each form a boss on the face of the disk of which the central zone 6 is projecting and form a hollow of corresponding shape on the other face of the disc 2. Each rib is thus as a dihedron. The height of the boss formed by the rib 36 is decreasing 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 a mounting of the bearing 26 in its housing similar to that illustrated in Figure 3 for the first embodiment. However, in the case of disks subject to high mechanical stresses tending to cause the bearing 26 to come out of its housing, a mounting with a flange may also be envisaged as illustrated in FIG. 4 (or 6). Similarly a ribbed disk (Figures 7 to 9) can also be combined with the embodiments of Figures 5 and 6 (shaft 28 through the bottom of the bearing housing).

As is apparent from the foregoing description, a disc itself can be made solely by forging without having to provide subsequent machining operations (milling, boring, etc.) to mount on it a hub or the like receiving a rolling to allow the disc to rotate freely around a tree.

Thus, using a disk as described above, machining operations are deleted. 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 separate cage, which is more fixed by bolts on the disc.

All this allows to significantly reduce the cost of a set to be mounted on a tree and having a disc for agricultural use.

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

Claims (10)

1. Disc (2) metal for agricultural use having a central zone (6) with means for connecting with a shaft (28) and a peripheral zone (4) for working a soil, characterized in that the means for making a connection with a shaft (28) comprise a recess (14) recessed in its central zone (6), closed at one end by a bottom (24) and having a circular cylindrical peripheral wall (12). 2. Disc according to claim 1, characterized in that the housing (14) has a 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 its central zone (6) to the peripheral zone (4). 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 zone (6) on one side of the peripheral zone (4) and has a corresponding recessed area on the other side of the peripheral zone (4). 5. Set 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 disposed inside the recess (14). 6. An assembly according to claim 5, characterized in that the bearing (26) is mounted tightly in its housing. 7. An assembly according to claim 5, characterized in that the bearing (26) is glued in its housing. 8. Disc according to claim 5, characterized in that the bearing (26) is mounted in the housing (14) by means of a flange (34) attached to the peripheral zone (4). 9. Assembly according to one of claims 6 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 greater diameter than that of its stem, and in that its 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 6 to 8, characterized in that it further comprises a shaft (28) having a rod (30) and a head (32) 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) formed in said bottom (24').