FR3105046A1 - Set of two concentric pieces - Google Patents

Abstract

The invention relates to an assembly of two concentric pieces fitted into one another, one central (10,10a) of which is cylindrical and the other of which is disc-shaped (11,11a) with a central opening. serrated (16) for angularly securing the two parts to one another after fitting one onto the other, the disc being axially blocked on the central part by a first stop (13,13a) formed by the part central and by a second stop (19,19a) formed after welding with addition of material. . Figure for the abstract: Fig. 5]

Description

Set of two concentric pieces

The invention relates to a set of two concentric pieces fitted into one another of a mobility device. The invention also relates to a damped flywheel comprising such an assembly. Finally, the invention relates to a method for assembling two concentric parts of a mobility device. The mobility device can be a vehicle, in particular a motor vehicle. The invention also relates to a damped flywheel of such a mobility device.

Technology background

there is shown a dual mass flywheel 1 comprising a primary mass 2 and a secondary mass 3 between which is interposed an elastic member (not shown). The secondary mass 3 comprises a plate 4, a hub 5, a connecting ring 6 and a disk 7. The disk 7 serves as a support for a pendular device 9. The plate 4 forms a support for the elastic member. The hub 5 forms a flange 8 extending radially and forming a connection support with the plate 4 and the disc 7, the plate 4 and the disc 7 being linked to the hub 5 on either side of the flange 8.

and [Fig. 3] is illustrated the assembly of part of the secondary mass 3. The connecting ring 6 is first placed on a first face 10 of the flange 8. Then the disc 7 is positioned on the connecting ring 6 and linked in rotation to the hub 5 by riveting the disc 7, the connecting ring 6 with the collar 8.

Thus, the assembly of the hub 5, the connecting ring 6 and the disc 7 requires a certain number of operations which make the assembly process complex and expensive.

Summary

One idea at the basis of the invention consists in proposing a set of two concentric parts fitted into one another aimed at solving the aforementioned problems.

To do this, the invention proposes a set of two concentric parts fitted into one another, one of which is centrally cylindrical and the other of which is disc-shaped with a serrated central opening to angularly secure the two parts with each other after fitting one on the other, the disc being axially blocked on the central part by a first stop formed by the central part and by a second stop formed after welding with addition of material.

Thanks to the invention, the assembly is carried out more simply and requires very few steps. The assembly is also made in such a way as to lock the disc axially in position in two opposite directions.

According to other embodiments of the invention, the assembly may include one or more of the characteristics described below:
the welding is carried out by welding technology such as MIG (Metal Inert Gas), TIG (Tungsten Inert Gas), MAG (Metal Active Gas), CMT (Cold Metal Transfer) or laser.
the central part forms a flange extending radially and forming the first stop.
the disk has an internal periphery with a first diameter comprised between a second diameter delimited by an external periphery of the central part and a second diameter delimited by a top of the collar.

The invention also relates to a method for assembling two concentric parts fitted into one another, one of which is cylindrical and the other of which is disc-shaped with a serrated central opening having teeth which , when fitting on it, make it possible to angularly secure the two parts to each other, in which it comprises the following steps:
axially lock the disc on the central part in a first direction by pressing on a first stop formed by the central part
axially block the disc on the central part in a second direction by a second stop formed after welding by addition of material,
fitting of the two parts one into the other until the two parts press against each other, and
welding by filler material of the two parts together.

According to one embodiment, the method also comprises the following step:
weld the disc and the central part by welding technology such as MIG (Metal Inert Gas), TIG (Tungsten Inert Gas), MAG (Metal Active Gas), CMT (Cold Metal Transfer) or laser.

Finally, the subject of the invention is a dual mass flywheel, characterized in that it comprises two concentric parts forming an assembly according to one of Claims 1 to 4 assembled by the method according to Claim 5, the central part constituting a hub of the double flywheel capable of cooperating with a shaft while the other part constitutes a plate of the double flywheel forming a support for an elastic member, or else a plate forming an additional inertia, or even a support for a pendular device.

The invention will be better understood, and other aims, details, characteristics and advantages thereof will appear more clearly during the following description of several embodiments of the invention, given solely by way of illustration and not limitation, with reference to the appended figures.

There illustrates a sectional view of a dual mass flywheel according to the prior art;

There illustrates an exploded perspective view of part of the dual mass flywheel according to [Fig. 1];

There illustrates an assembled perspective view of the part according to [Fig. 2];

There illustrates an exploded perspective view of part of a set of two concentric pieces according to one embodiment of the invention;

There illustrates a view of the part illustrated in [Fig. 4] in an assembled state;

There illustrates a step in the method of assembling a set of two concentric parts according to another embodiment of the invention;

There illustrates another step of the method of assembling a set of two concentric parts according to another embodiment of the invention;

Unless otherwise indicated, “axially” means “parallel to an axis of rotation X of the device”; "radially" means "along a transverse axis intersecting the axis of rotation of the device"; “Angularly” or “circumferentially” means “around the axis of rotation of the device”.

"front" or "rear" in a direction defined with respect to an axial orientation determined by the axis of rotation X of the torque transmission device, "the front" designating the part located to the right of the figures, on the side of a gearbox for example, and “the rear” designating the left part of the figures, on the side of an engine for example; And ;

"inside/internal" or "outside/external" with respect to the axis of rotation X and following a radial orientation, orthogonal to the axial orientation, the "inside" designating a proximal part of the axis of rotation X and “outside” designating a distal part of said axis of rotation X;

There illustrates a hub 10 and a disc 11 before assembly according to a first embodiment of the invention. The [Fig. 5] illustrates the hub 10 and the disc 11 assembled according to the first example of the invention. The hub 10 and the disc 11 can form part of a dual mass flywheel of a motor vehicle (not illustrated). Disc 11 can be part of a secondary mass (not shown) of such a dual mass flywheel and serve as a support for a pendular device (not shown). The hub 10 and the disc 11 form two concentric parts.

The hub 10 has an elongated cylindrical part 12 and a collar 13 extending radially from the cylindrical part 12. The cylindrical part 12 has on an internal periphery a fluted surface 14 capable of meshing with a corresponding surface formed by a shaft, in one example a gearbox transmission shaft. The outer periphery 15 of the cylindrical part 12 has a smooth surface.

The disc 11 has in this example a pot shape with a central orifice 16 bordered by a serrated peripheral edge 17. The serrated peripheral edge 17 has a diameter between that delimited by the outer circumference 15 of the cylindrical part and that delimited by a vertex 18 of the collar 13.

The teeth formed by the peripheral edge 17 are made with a greater hardness than that formed by the outer circumference 15. Thus, when the hub 10 and the disc 11 are assembled with each other, the teeth go become embedded in the material formed by the hub 10 thus ensuring the rotational connection of the hub 10 and the disc 11 with each other.

Disc 11 is placed around hub 10 while being retained axially by bearing against collar 18 in a first direction. Once hub 10 and disc 11 are assembled, disc 11 is also retained axially in a second direction, opposite to the first direction. This axial retention is carried out by means of a spot weld 19. This spot weld 19 is produced using technologies of the MIG (Metal Inert Gas), MAG (Metal Active Gas), TIG (Tungsten Inert Gas), CMT (Cold Metal Transfer) or by laser.

THE and [Fig. 7] illustrate the assembly of a hub 10a and a disk 11a according to another example of the invention. The hub 10a and the disc 11a are assembled with each other until the disc 11a comes into abutment against the flange 13a [Fig. 6], [Fig. 7]. The disk 11a has at its inner peripheral edge, bordering the serrated inner peripheral periphery 17a, a first face axial face 20a. Thus, the disc 11a comes to bear by its first bearing face 20a against a corresponding surface formed by the collar 13a. Then, a spot weld 19a is applied between the disc 11a and the hub 10a as illustrated at 19a [Fig. 7]. As for the previous example, this spot weld 19a is produced using technologies of the MIG (Metal Inert Gas), MAG (Metal Active Gas), TIG (Tungsten Inert Gas), CMT (Cold Metal Transfer) or by laser. This spot weld 19a is made on a second axial face 21a, opposite to the axial face 20a.

Claims (7)

. Set of two concentric pieces fitted into one another, one of which is central (10,10a) is cylindrical and the other of which is disc-shaped (11,11a) with a serrated central opening (16) to angularly secure the two parts to each other after fitting one onto the other, the disc being axially blocked on the central part by a first stop (13, 13a) formed by the central part and by a second abutment (19,19a) formed after welding with addition of material. . Assembly according to claim 1, in which the welding is carried out by welding technology such as MIG, TIG, MAG, CMT or laser. . Assembly according to claim 1 or 2, in which the central part (10a) forms a collar (13a) extending radially and forming the first stop. . Assembly according to Claim 3, in which the disc has an internal circumference (17) with a first diameter comprised between a second diameter delimited by an external circumference (15) of the central part and a second diameter delimited by a vertex (18, 18a ) of the collar. . Method of assembling two concentric pieces fitted into each other, one of which is cylindrical and the other of which is disc-shaped with a serrated central opening having teeth which, when fitted onto that -ci, make it possible to angularly secure the two parts to each other, in which it comprises the following steps:
axially lock the disc on the central piece in a first direction by pressing on a first stop formed by the central piece,
axially block the disc on the central part in a second direction by a second stop formed after welding by addition of material,
fitting of the two parts one into the other until the two parts press against each other, and
welding by filler material of the two parts together. . Method according to the preceding claim, in which it comprises the following step:
weld the disc and the central part by welding technology such as MIG, TIG, MAG, CMT or laser. . Double mass flywheel, characterized in that it comprises two concentric parts forming an assembly according to one of Claims 1 to 4 assembled by the process according to Claim 5 or 6, the central part constituting a hub of the double flywheel capable of cooperating with a shaft while the other part constitutes a plate of the double flywheel forming a support for an elastic member, or else a plate forming an additional inertia, or else a support for a pendular device.