DE102018007399A1 - Method for attaching a torque transmission element to a hub - Google Patents

Abstract

The invention relates to a method for fastening a torque transmission element (4) to a hub (2), with the method steps of providing a hub (2), providing a torque transmission element (4) with an essentially annular disk-shaped section (20) formed by a sheet metal has a first radial section (26) and a second radial section (28) adjoining the first radial section (26) in the radial direction (10), the first radial section (26) on a joining side (36) of the annular disk-shaped section (20 ) is at least partially set back with respect to the second radial section (28), applying the joining side (36) of the annular disk-shaped section (20) in the axial direction (8) to the hub (2) while achieving a radial overlap area (62) in which the first Radial section (26) at least partially spaced from the hub (2) and the second radial section (28) on the Na be (2) and welding the annular disc-shaped section (20) to the hub (2) by resistance welding.

Description

The present invention relates to a method for fastening a torque transmission element to a hub by resistance welding.

Multi-disc clutches and multi-disc brakes are known from practice, which have a hub and a torque transmission element. Lamellar carriers made from sheet metal, in particular, are known, which are connected to a hub. In order to connect the disk carrier to the hub, the disk carrier is riveted or screwed to the hub, for example. As an alternative to this, the disk carrier can also be integrally connected to the hub in order to achieve a torque transmission between the hub and disk carrier. The disk carrier is welded in particular to the hub. In this context, resistance welding, in particular, has proven to be advantageous, in which the torque transmission element in the form of the disk carrier is applied to the hub in order to subsequently apply the electrodes for resistance welding both to the hub and to the disk carrier. Subsequently, the electrodes are energized, preferably with the application of a pressing force, so that in the area of the contact surfaces between the disk carrier and the hub, due to the increased resistance, heat is generated which ultimately leads to the welding or joining of the two components.

The method known from practice for fastening the torque transmission element in the form of the disk carrier to a hub by resistance welding has proven itself in principle, but has some disadvantages. It has been shown that a relatively high welding energy is required. In addition, there is an increased discharge of weld metal, so that splashes of the weld metal also reach other areas of the hub or the torque transmission element, which necessitates subsequent processing or cleaning. This weld metal spatter is particularly disadvantageous if the torque transmission element and / or the hub prior to a heat treatment, such as. B. hardening, or a surface treatment such. B. nitriding, was subjected, especially since the weld metal splashes mentioned could partially nullify the effect achieved by the corresponding treatment.

It is therefore an object of the present invention to provide a method for fastening a torque transmission element to a hub by resistance welding, in which a low welding energy is necessary, large connection widths can be achieved and in particular damage or reworking of the torque transmission element and / or the hub by weld metal spatter is avoided can be.

This object is achieved by the features specified in claim 1. Advantageous embodiments of the invention are the subject of the dependent claims.

The method according to the invention is used to fasten a torque transmission element, for example a rotary drive disk or a disk carrier, to a hub and has the method steps described in more detail below. So a hub is initially provided. The hub is preferably designed as a turned part or cast part and particularly preferably consists of a metallic material. In addition, a torque transmission element is provided, the torque transmission element also being made at least partially of metal. The torque transmission element can be, for example, a disk carrier or a rotary drive disk. The hub and / or the torque transmission element is preferably heat-treated, optionally hardened, or surface-treated, optionally nitrided. The torque transmission element provided has an essentially annular disk-shaped section formed by a sheet metal. The annular disk-shaped section has a first radial section and a second radial section adjoining the first radial section in the radial direction, the first radial section on the joining side of the annular disk-shaped section being at least partially set back with respect to the second radial section. The joining side of the annular disk-shaped section here describes the side of the annular disk-shaped section, which is preferably oriented in the axial direction and is to be connected to the hub. In principle, the first radial section can be reset only in part or in sections, but it is also possible to reset the entire first radial section on the joining side of the annular disk-shaped section with respect to the second radial section. In the course of the further method, the joining side of the annular disk-shaped section is applied to the hub in the axial direction, so that a radial overlap area is achieved. A radial overlap region is to be understood here as an overlap region between the hub and the annular disk-shaped section, which exists when viewed in the axial direction. By applying the joining side of the annular disk-shaped section to the hub, the first radial section of the annular disk-shaped section is at least partially spaced from the hub in the radial overlap region, namely where it is opposite the second Radial section is reset while the second radial section abuts the hub. In this case, the second radial section does not have to lie completely against the hub, rather it is sufficient in this case if the second radial section lies at least partially against the hub. The annular disk-shaped section is then welded to the hub by resistance welding, it being possible for this purpose, for example, to place an electrode on the annular disk-shaped section of the torque transmission element and another electrode on the hub before the two electrodes are energized.

In the method according to the invention, it has been shown that the weld metal outlet in the radial direction outwards and in the radial direction inwards is significantly cheaper, especially since weld metal splashes hardly emerge, which would damage the torque transmission element or the hub and would possibly require their reworking. A particularly simple and largely post-processing-free method for fastening the torque transmission element to the hub is thus created. In addition, the method according to the invention enables relatively large connection widths to be achieved between the hub and the torque transmission element, which can be attributed to the absorption of weld metal in the side of the first radial section which is at least partially set back with respect to the second radial section, this also being the cause of the lower tendency to spray Weld metal is. Furthermore, the knowledge was gained that a lower welding energy, that is to say in particular a lower electrical energy for resistance welding, is required in the method according to the invention.

As already mentioned above, the first radial section on the joining side of the annular disk-shaped section does not fundamentally have to be set back completely with respect to the second radial section. In a preferred embodiment of the method according to the invention, however, the first radial section is circumferential, preferably closed circumferential, set back relative to the second radial section or spaced from the hub as soon as the joining side of the annular disk-shaped section has been applied to the hub in the axial direction. As a result, the tendency to spray in the context of resistance welding can be further reduced, the expansion of the first radial section in the radial direction contributing to an increase in the connection width to the hub.

In an advantageous embodiment of the method according to the invention, the first radial section of the annular disk-shaped section of the torque transmission element provided extends up to an end edge of the annular disk-shaped section. This is preferably the end edge of the annular disk-shaped section pointing inwards in the radial direction, which is therefore designed to be closed all around in the circumferential direction. In this case, it is preferred if the first radial section is at least partially set back as far as the end edge with respect to the second radial section, in other words the recess or recess extends here to the end edge mentioned, as a result of which the tendency to spray in this area can be reduced.

In a further preferred embodiment of the method according to the invention, the first radial section is set back at least 0.8 mm, preferably at least 1 mm, with respect to the second radial section. It has been shown that, starting from the minimum values mentioned, the tendency to spray during resistance welding is again significantly reduced, as a result of which damage to or soiling of the components is prevented and post-processing is unnecessary. Alternatively or additionally, it has proven to be advantageous if the reset of the first radial section compared to the second radial section amounts to at least 90%, preferably at least 100% or more, of a melting path by which the hub and the torque transmission element are moved towards one another during welding.

In a particularly advantageous embodiment of the method according to the invention, the first radial section is set back with respect to the second radial section to form a step flank which, on the joining side, forms an angle of at most 120 ° with the first radial section in order to achieve a particularly advantageous introduction of the welding energy or the current and on the other hand to reduce the tendency to spray during resistance welding. In this context, it is particularly preferred if the angle included on the joining side is at most 105 °, particularly preferably at most 90 °.

In a further advantageous embodiment of the method according to the invention, in the context of resistance welding, an electrode is brought into contact with an application side of the annular disk-shaped section facing away from the joining side. In this case, it is preferred if the electrode is brought into contact with the contact side of the annular disk-shaped section facing away from the joining side in order to achieve a circumferential or closed circumferential contact area in order to achieve a relatively large contact area. In this case, the electrode is particularly preferably in contact with the second radial section of the annular disk-shaped section in Contacted to bring the electricity in a targeted manner. It has proven to be particularly advantageous here if the electrode is brought into contact with both the first and the second radial section in order to achieve a large-area introduction of the current in the context of resistance welding, while the concentration in the area between the hub and the second radial section is advantageously ensured by the geometry described, that is to say the at least partial resetting of the first radial section with respect to the second radial section.

In a particularly preferred embodiment of the method according to the invention, the annular disk-shaped section in the region of the first radial section, with the same being set back, has a smaller thickness on the joining side than the second radial section than in the second radial section. A smaller thickness in the region of the first radial section is just as easy to produce as, for example, only a resetting of the first radial section while deforming the annular disk-shaped section and maintaining the same thickness as in the second radial section, but due to the smaller thickness in the first radial section, an application side of the annular disk-shaped section can have smaller deviations from a radial plane, so that the electrode can be brought into contact with the loading side of the annular disk-shaped section in a particularly simple and reliable manner. It is therefore preferred in this embodiment if the application side of the annular disk-shaped section facing away from the joining side is arranged in the region of the first and second radial section in the same radial plane in order to achieve a suitable surface for applying the electrode in the context of resistance welding.

In a further preferred embodiment of the method according to the invention, the recessed first radial section is produced on the annular disk-shaped section by a material-forming process or by a material-removing process. Embossing is particularly advantageous here, especially since this can be carried out precisely in a particularly simple manner as part of the production of the torque transmission element and even in the case of an annular disk-shaped section with a small thickness. For example, in the case of a torque transmission element in the form of a disk carrier, the embossing can be carried out at the same time as the shape of the disk carrier, for example by deep drawing. If a material-removing process is used, grinding, but especially turning or milling, is preferred.

In a further advantageous embodiment of the method according to the invention, the hub provided has a joining side on which the joining side of the annular disk-shaped section of the torque transmission element is applied in the axial direction, thereby achieving the radial overlap area.

According to a further advantageous embodiment of the method according to the invention, the joining side of the hub provided has an inner radial section which overlaps with the first radial section in the axial direction and an outer radial section, the second radial section of the annular disk-shaped section of the torque transmission element being supported on the outer radial section.

In a particularly advantageous embodiment of the method according to the invention, the outer radial section of the joining side of the hub has at least one shoulder projecting axially beyond the inner radial section, on which the second section of the annular disk-shaped section of the torque transmission element is placed or supported. This at least one axially projecting approach advantageously provides the weld metal to be melted for connecting the torque transmission element and the hub. Furthermore, depending on the shape of the at least one protruding approach, a particularly targeted control of the current flow is possible in order to concentrate the welding energy.

As an alternative to the embodiment described above, the inner and outer radial sections are arranged on the joining side in a common radial plane, so that the aforementioned axially projecting projections are dispensed with, which simplifies the construction of the hub used for the method, especially since the first radial section is already reset compared to the second radial section of the annular disk-shaped section of the torque transmission element, good control and route guidance of the current flow within the scope of resistance welding enables.

Should - in contrast to the previously described embodiment - at least one axially protruding shoulder be provided on the outer radial section of the hub, then in a further advantageous embodiment of the method according to the invention a plurality of approaches spaced apart in the circumferential direction are provided in order to selectively spaced the hub and torque transmission element To connect welds together. As an alternative, a protruding projection on the outer radial section that runs around the circumference, preferably running all the way round, is the Hub designed to be able to produce a corresponding circumferential weld seam.

According to a further preferred embodiment of the method according to the invention, the joining side of the hub is provided on an annular disk-shaped section of the hub. It is preferred if, in the context of resistance welding, an electrode is brought into contact with an application side of the annular disk-shaped section facing away from the joining side of the hub, if necessary to achieve a circumferential or closed circumferential contact area.

According to a further advantageous embodiment of the method according to the invention, the hub also has a tubular section which extends in the axial direction and inwards in the radial direction adjoining the annular disk-shaped section of the hub. It is advantageous if the tubular section of the hub, which is optionally formed in one piece with the annular disk-shaped section of the hub, has a rotary driving contour, which can be formed, for example, on the side of the tubular section of the hub that points inwards in the radial direction. The rotary driving contour is preferably a toothing.

In a further advantageous embodiment of the method according to the invention, the torque transmission element is a disk carrier for a disk clutch or brake. The disk carrier has the aforementioned annular disk-shaped section and an adjoining, preferably integrally formed, tubular disk carrier section. It is preferred here if the lamella support section has a rotary driving contour for lamellae. Furthermore, it is preferred if the lamella carrier is produced by deep drawing.

• 1 eine Seitenansicht einer Nabe und eines Drehmomentübertragungselements in geschnittener Darstellung, die im Rahmen des Verfahrens aneinander befestigt werden sollen, vor dem Anlegen des Drehmomentübertragungselements an die Nabe,
• 2 eine Ansicht der Nabe aus 1 in Richtung des Pfeils A in einer ersten Ausführungsvariante,
• 3 eine Ansicht der Nabe aus 1 in Richtung des Pfeils A in einer zweiten Ausführungsvariante,
• 4 eine Ansicht der Nabe aus 1 in Richtung des Pfeils A in einer dritten Ausführungsvariante,
• 5 eine teilweise Ansicht des Drehmomentübertragungselements aus 1 in Richtung des Pfeils B in einer ersten Ausführungsvariante,
• 6 eine Ansicht des Drehmomentübertragungselements aus 1 in Richtung des Pfeils B in einer zweiten Ausführungsvariante,
• 7 eine vergrößerte Darstellung des Ausschnitts C in 1,
• 8 die Nabe und das Drehmomentübertragungselement aus 1 nach dem Anlegen des Drehmomentübertragungselements an die Nabe,
• 9 eine vergrößerte Darstellung des Ausschnitts D in 8 nach dem Anlegen der Elektroden im Rahmen des Widerstandsschweißens und
• 10 die Darstellung aus 9 nach dem Widerstandsschweißen und dem Entfernen der Elektroden.

The invention is explained in more detail below using exemplary embodiments with reference to the accompanying drawings. Show it:

• 1 2 shows a side view of a hub and a torque transmission element in a sectional illustration, which are to be fastened to one another in the course of the method, before the torque transmission element is applied to the hub,
• 2nd a view of the hub 1 in the direction of arrow A in a first embodiment,
• 3rd a view of the hub 1 in the direction of arrow A in a second embodiment variant,
• 4th a view of the hub 1 in the direction of arrow A in a third embodiment variant,
• 5 a partial view of the torque transmission element 1 in the direction of arrow B in a first embodiment variant,
• 6 a view of the torque transmission element from 1 in the direction of arrow B in a second embodiment variant,
• 7 an enlarged view of section C in 1 ,
• 8th the hub and the torque transmission element 1 after applying the torque transmission element to the hub,
• 9 an enlarged view of section D in 8th after applying the electrodes in the context of resistance welding and
• 10th the representation 9 after resistance welding and removing the electrodes.

As part of the method for fastening a torque transmission element to a hub, a hub 2nd and a torque transmission element 4th provided. The torque transmission element 4th is designed here as a slat carrier, which was made by deep drawing from a sheet metal part. In the figures, the opposite axial directions are 6 , 8th , the opposite radial directions 10th , 12th and the opposite circumferential directions 14 , 16 both the hub 2nd as well as the torque transmission element 4th indicated by appropriate arrows, one also being in the axial directions 6 , 8th extending axis of rotation 18th the hub 2nd and the torque transmission element 4th is indicated.

The torque transmission element formed or shaped overall from a sheet metal or sheet metal part 4th in the form of the lamellar carrier points essentially in the radial directions 10th , 12th extending annular disc-shaped section 20th on. The ring-shaped section 20th has one in the radial direction 12th facing inwards and in the circumferential direction 14 , 16 circumferential end edge 22 on that a central opening 24th of the torque transmission element 4th surrounds or faces it. Following the end edge 22 the annular disk-shaped section extends 20th in the radial direction 10th to the outside, initially via a first radial section 26 , one at the first radial section 26 subsequent second radial section 28 and one on the second radial section 28 subsequent third radial section 30th . The first radial section extends 26 starting from the inner end edge 22 up to a first radius r ₁ . The second radial section 28 extends, however, starting from the first radius r ₁ up to a second radius r ₂ . The third radial section 30th extends from the second radius r ₂ further out to a tubular lamella support section 32 . The tubular lamella support section 32 is in one piece with the annular disk-shaped section 20th formed and extends from that in the radial direction 10th outward end of the third radial section 30th in the axial direction 8th . The tubular lamella support section also has 32 a rotary driving contour 34 on that a rotary drive with on the torque transmission element 4th slats to be arranged, the rotary driving contour 34 can be formed, for example, as a toothing. In the illustrated embodiment, the rotary driving contour 34 than in the radial direction 12th inward turning driving contour 34 trained, but this can also be in the radial direction 10th outward-facing rotary drive contour 34 be trained. It may be the torque transmission element 4th act in the form of the disk carrier an outer or inner disk carrier.

The ring-shaped section 20th points one in the axial direction 8th pointing side 36 and one of the joining sides 36 facing away from the admission side 38 on that in the axial direction 6 points. On the joining side 36 it is that side of the annular disk-shaped section 20th to the hub as part of the process 2nd applied and on the hub 2nd is attached. On the admission side 38 on the other hand, it is the side to which an electrode is placed as part of resistance welding, which will be discussed in more detail later.

How from 1 can be seen, the first radial section 26 on the joining side 36 of the ring-shaped section 20th opposite the second radial section 28 reset. More specifically, the first radial section 26 joining side opposite the second radial section 28 in the axial direction 6 reset. In the embodiment according to the 1 and 5 is the first radial section 26 in the circumferential direction 14 , 16 closed all around with respect to the second radial section 28 reset. One can therefore also from an annular recess on the joining side 36 in the area of the first radial section 26 speak. Furthermore, the first radial section extends 26 in the radial direction 12th inwards to the end edge 22 of the ring-shaped section 20th , the first radial section 26 to the end edge 22 opposite the second radial section 28 is reset. The same applies to the first radius r ₁ , d . H. the first radial section 26 extends not only in the radial direction 10th outward to the first radius r ₁ , rather is the first radial section 26 even up to this first radius r ₁ opposite the second radial section 28 reset. Also is the first radial section 26 joining side by a predetermined distance a opposite the second radial section 28 reset, the distance a especially the 7 can be removed. The distance a is at least 0.8 mm, preferably at least 1 mm, in order to enhance the advantages of the method according to the invention.

The 1 and 7 can also be seen that the first radial section 26 on the joining side, forming a step flank 40 opposite the second radial section 28 is reset. The first radial section is reset 26 such that the step edge 40 an angle α with the first radial section 26 includes. That angle α should be a maximum of 120 °, preferably a maximum of 105 °. It has proven to be particularly advantageous if the angle α is a maximum of 90 °, as in the 1 and 7 is shown.

From the 1 and 7 it can also be seen that the annular disk-shaped section 20th in the area of the first radial section 26 resetting it on the joining side 36 opposite the second radial section 28 a thickness b has less than a thickness c of the second radial section 28 is. However, the first radial section is reset 26 not creating bumps on the loading side 38 between the first and second radial sections 26 , 28 , rather that is the joining side 36 facing away from the admission side 38 of the ring-shaped section 20th in the area of the first and second radial section 26 , 28 in the same radial plane 42 arranged.

The reset first radial section 26 is produced by a material-forming process, preferably by embossing. Alternatively, however, a material-removing process, for example turning, milling or grinding, can also be carried out on the annular disk-shaped section 20th have been performed to the first radial section set back 26 to create.

6 shows an alternative design variant 5 . In this second variant, the first radial section 26 not completely on the joining side with respect to the second radial section 28 reset, in particular the first radial section 26 not in the circumferential direction 14 , 16 circumferentially with respect to the second radial section 28 reset. The first radial section 26 is rather only partially opposite the second radial section 28 reset. How from 6 can be seen, the reset takes place rather in spaced-apart circumferential areas of the first radial section 26 , so that from a variety of circumferential 14 , 16 spaced-apart depressions in the joining side 36 in the area of the first radial section 26 can be spoken. This second embodiment variant is particularly suitable in connection with the in 3rd Design variant of the hub shown 2nd , which will be discussed in more detail later.

The hub provided 2nd consists essentially of a ring-shaped section 44 and one in the radial direction 12th inwards to the ring-shaped section 44 subsequent and in the axial direction 6 , 8th extending tubular section 46 together. On the tubular section 46 is a turning drive contour 48 , for example a toothing, is provided, which is used for the later generation of a rotary driving connection with a shaft or the like. The turning drive contour 48 is in the illustrated embodiment, for example, in the radial direction 12th inward side of the tubular section 46 trained, but can also in the radial direction 10th outward-facing side of the tubular section 46 be trained. The ring-shaped section 44 and the tubular section 46 are preferably formed in one piece.

The ring-shaped section 44 the hub 2nd points one in the axial direction 6 pointing side 50 and one of the joining sides 50 facing away and in the axial direction 8th pointing exposure side 52 on. The ring disk-shaped section also comprises 44 the hub 2nd an inner radial section 54 that is in the radial direction 10th outwards to a third radius r ₃ extends. In the radial direction 10th an outer radial section also closes 56 to the inner radial section 54 starting from the third radius r ₃ up to a fourth radius r ₄ extends, at the level of the fourth radius r ₄ also in the radial direction 10th outward-facing end edge 58 of the ring-shaped section 44 the hub 2nd is arranged.

Like from the 1 and 2nd visible, the outer radial section 56 on the joining side 50 at least one over the inner radial section 54 in the axial direction 6 protruding approach 60 on. So the approach can 60 for example as one in the circumferential direction 14 , 16 closed circular approach 60 be trained as this in the 1 and 2nd is indicated. Alternatively, however, several can also be used in the circumferential direction 14 , 16 spaced approaches 60 be provided, as in the second embodiment of the hub 2nd in 3rd is shown. as already indicated above, the second embodiment variant is after 3rd in particular in connection with the second embodiment variant of the torque transmission element 4th to 6 suitable. Nevertheless, the variant is after 3rd also in connection with the variant according to 5 of the torque transmission element 4th an advantage, especially when welding to the relative rotational position of the hub 2nd opposite the torque transmission element 4th must be respected. In a third variant of the hub 2nd , in the 4th on the other hand, there are no protruding lugs, rather the inner and outer radial sections 54 , 56 arranged on the joining side in a common radial plane.

After both the hub 2nd as well as the torque transmission element 4th of the type described has been provided, the joining side 36 of the ring-shaped section 20th in the axial direction 8th to the joining side 50 of the ring-shaped section 44 the hub 2nd laid out so that in the axial direction 6 respectively. 8th considers a radial overlap area 62 between the two ring-shaped sections 20th , 44 arises like this in the 8th and 9 is shown. The first radial section is in the radial overlap region 62 26 joining side in the axial direction 6 , 8th from the ring-shaped portion 44 the hub 2nd spaced during the second radial section 28 on the ring-shaped section 44 the hub 2nd is present. More precisely, the second radial section lies 28 of the torque transmission element 4th at the outer radial section 56 of the ring-shaped section 44 the hub 2nd on. In the design variants according to the 2nd and 3rd this is done using the at least one prominent approach 60 at the outer radial section 56 . If, as in the embodiments according to 1 to 3rd , prominent approaches 60 are provided, so is in the axial direction 6 , 8th a distance d between the inner radial section 54 the hub 2nd and the first radial section 26 of the torque transmission element 4th formed, which is larger than the aforementioned distance a is. In the case of the components placed against one another in this way, the first radial section overlap 26 and the inner radial section 54 , the first radius r ₁ and the third radius r ₃ are preferably substantially identical, while on the other hand the second radial section 28 and the outer radial section 56 in the axial direction 6 , 8th overlap, it is preferred if the second radius r ₂ the fourth radius r ₄ essentially corresponds.

After applying the torque transmission element 4th to the hub 2nd will be in the frame of resistance welding a first electrode 64 with the loading side 38 of the torque transmission element 4th brought into contact. This is preferably done in the circumferential direction 14 , 16 closed circumferential contact area 66 between the first electrode 64 and the torque transmission element 4th . For this purpose the first electrode 64 at least on their the torque transmission element 4th facing end ring-shaped, such as the 9 can be removed. Is also out 9 it can be seen that the first electrode 64 has both the first radial section on the application side 26 as well as with the second radial section 28 of the ring-shaped section 20th of the torque transmission element 4th is brought into contact by the common radial plane 42 the loading side 38 in the area of the first and second radial section 26 , 28 is significantly simplified and guarantees an ideal power supply in the context of resistance welding. In addition, a second electrode 68 with the loading side 52 the hub 2nd brought into contact, this in turn preferably achieving a circumferential direction 14 , 16 closed circumferential contact area 70 between the ring-shaped second electrode 68 and the loading side 52 the hub 2nd he follows. Here, too, the second electrode 68 is preferably connected to both the inner and the outer radial section 54 , 56 brought into contact.

Thereafter, resistance welding is carried out, producing a current flow between the electrodes 64 , 68 via the torque transmission element 4th and the hub 2nd performed, the two electrodes 64 , 68 preferably in the axial direction 8th , 6 pressed against one another or pressed together to form the torque transmission element 4th and the hub 2nd to press against each other accordingly. Because of the concentration of the current flow in the area between the second radial section 28 and the outer radial section 56 There is a strong heating here, which ultimately leads to melting of the material of the torque transmission element 4th and hub 2nd lead in this area, making a weld 72 or - depending on the design variant - one or more welding spots arise, whereby in 10th an appropriate weld 72 is indicated, in the illustrated embodiment in the circumferential direction 14 , 16 is circumferentially formed. In the embodiment shown, the heating leads in particular to melting of the at least one batch 60 . The hub moves as it melts and compresses 2nd and the torque transmission element 4th starting from the position in 9 around a melting path e in the axial direction 6 , 8th towards each other, it having proven to be advantageous if the method is carried out in such a way that the aforementioned distance a at least 90%, preferably 100% or more, of the melting path on the provided torque transmission element 4 e is.

It has been shown that both in the radial direction 10th to the outside as well as in the radial direction 12th Relatively little weld metal escapes towards the inside, in particular spraying of the weld metal can be prevented, which otherwise leads to contamination of the hub 2nd or torque transmission element 2nd , 4th and would have required post-processing.

Reference list

2nd

hub

4th

Torque transmission element

6

axial direction

8th

axial direction

10th

radial direction

12th

radial direction

14

Circumferential direction

16

Circumferential direction

18th

Axis of rotation

20th

washer-shaped section

22

End edge

24th

opening

26

first radial section

28

second radial section

30th

third radial section

32

tubular lamella support section

34

Turning contour

36

Joining side

38

Loading side

40

Step flank

42

Radial plane

44

disc-shaped section of the hub

46

tubular section

48

Turning contour

50

Joining side of the hub

52

Loading side of the hub

54

inner radial section

56

outer radial section

58

End edge

60

approach

62

radial overlap area

64

first electrode

66

Contact area

68

second electrode

70

Contact area

72

Weld

a

distance

α

angle

b

thickness

c

thickness

d

distance

e

Melting path

r ₁

first radius

r ₂

second radius

r ₃

third radius

r ₄

fourth radius

Claims (10)

Method for fastening a torque transmission element (4) to a hub (2) with the method steps Providing a hub (2), Providing a torque transmission element (4) with an essentially annular disk-shaped section (20) formed by a sheet metal, said section having a first radial section (26) and a second radial section (28) adjoining the first radial section (26) in the radial direction (10) ), the first radial section (26) on a joining side (36) of the annular disk-shaped section (20) being at least partially set back with respect to the second radial section (28), Applying the joining side (36) of the annular disk-shaped section (20) in the axial direction (8) to the hub (2) while achieving a radial overlap area (62) in which the first radial section (26) is at least partially spaced apart from the hub (2) and the second radial section (28) abuts the hub (2) and Welding the annular disk-shaped section (20) to the hub (2) by resistance welding. Procedure according to Claim 1 , in which the first radial section (26) is circumferentially (14, 16) circumferentially, preferably closed circumferentially, set back with respect to the second radial section (28) or spaced from the hub (2) and / or the first radial section (26) to extends to an end edge (22) of the annular disk-shaped section (20), the first radial section (26) preferably being at least partially set back as far as the end edge (22) relative to the second radial section (28). Method according to one of the preceding claims, in which the first radial section (26) is set back at least 0.8 mm, preferably at least 1 mm, with respect to the second radial section (28) and / or is set back to form a step flank (40) which has a joining side Includes angle (α) of at most 120 °, preferably at most 105 °, particularly preferably at most 90 °, with the first radial section (26). Method according to one of the preceding claims, in which, in the context of resistance welding, an electrode (64) with an application side (38) of the annular disk-shaped section (20) facing away from the joining side (36), possibly with or without achieving a circumferential direction (14, 16) closed peripheral contact area (66) is brought into contact, the electrode (64) preferably being brought into contact at least with the second radial section (28), particularly preferably with the first and second radial sections (26, 28). Method according to one of the preceding claims, in which the annular disk-shaped section (20) in the region of the first radial section (26), with the same being set back on the joining side (36) compared to the second radial section (28), has a smaller thickness (b) than in the second radial section ( 28), wherein the application side (38) facing away from the joining side (36) is preferably arranged in the region of the first and second radial section (26, 28) in the same radial plane (42). Method according to one of the preceding claims, in which the recessed first radial section (26) is produced on the annular disk-shaped section (20) by a material-forming process, preferably by stamping, or by a material-removing process, preferably by turning, milling or grinding. Method according to one of the preceding claims, in which the hub (2) has a joining side (50) on which the joining side (36) of the annular disk-shaped section (20) in the axial direction (6, 8) while achieving the radial overlap region (62) is applied, the joining side (50) of the hub (2) preferably having an inner radial section (54) overlapping with the first radial section (26) in the axial direction (6, 8) and an outer radial section (56) on which the second Radial section (28) is supported, and the outer radial section (56) particularly preferably has at least one shoulder (60) projecting axially beyond the inner radial section (54), on which the second radial section (28) is supported. Procedure according to Claim 7 , in which the inner and outer radial sections (54, 56) are arranged on the joint side in a common radial plane or in which a plurality of lugs (60) spaced apart in the circumferential direction (14, 16) or one circumferentially (14, 16) circumferentially, preferably closed circumferential, protruding approach (60) is provided. Procedure according to one of the Claims 7 or 8th , in which the joining side (50) of the hub (2) is provided on an annular disk-shaped section (44) of the hub (2), an electrode (68) with one of the joining side (50) of the hub (2 ) facing away from the application side (52) of the annular disc-shaped portion (44) of the hub (2), possibly with the achievement of a circumferential direction (14, 16) circumferential or closed circumferential contact area (70), and the hub (2) further particularly preferably has a tubular section (46) which extends in the axial direction (6, 8) and in the radial direction (12) inwards to the annular disk-shaped section (44) of the hub (2) and which optionally has a rotary driving contour (48). Method according to one of the preceding claims, in which the torque transmission element (4) is a disk carrier which has the annular disk-shaped section (20) and an adjoining, preferably integrally formed, tubular disk section (32), the disk section (32) being particularly preferred preferably has a rotary driving contour (34) for lamellas and / or the lamellar carrier is produced by deep drawing.

Images