WO2011047993A1

WO2011047993A1 - Rivet, riveting device and riveting method

Info

Publication number: WO2011047993A1
Application number: PCT/EP2010/065312
Authority: WO
Inventors: Josef Bayer; Winfried Bokisch
Original assignee: Zf Friedrichshafen Ag
Priority date: 2009-10-19
Filing date: 2010-10-13
Publication date: 2011-04-28
Also published as: DE102009045791A1; EP2490841A1; CN102548683A

Abstract

The invention relates to a rivet (1), to a riveting device, and to a riveting method for riveting at least two elements (36, 38) of a drive train in a vehicle, wherein an embossment (20) is embossed in the rivet (1) during the riveting method using the riveting device.

Description

Patent application

Rivet, riveting device and riveting method

Description:

The present invention relates to a rivet, a riveting device and a riveting method for riveting two elements in a drive train of a

Vehicle.

In automotive elements of the powertrain, in particular the coupling elements are riveted together. For this purpose, for example, in the production of a clutch disc drive plate and pad spring arranged on a riveting device such that their openings come to lie one above the other. Through these superposed openings a rivet is inserted, which is then deformed by pressure such that its rivet shank fills the opening, whereby the two elements are positively connected with each other.

Since usually not only a rivet, but a number of rivets are necessary to produce, for example, the clutch disc, riveting devices, so-called assembly tables, are used in which automated rivet holders are provided with substantially vertically aligned rivets on which then the to riveting elements are arranged, and in a single riveting step, all rivets are pressed together.

The problem with this prior art, however, is that due to unevenness on one of the elements to be riveted not all set heads of the rivets flat against the riveted element, so that in the subsequent riveting the Lochfüllverhalten and the resulting bearing pressure is not sufficient to provide a sufficient positive engagement of the elements to be riveted.

Due to the force acting on the riveting elements forces can then solve the rivet, so that a committee is produced, or solve the components of the clutch discs in the course of operation.

It has therefore been proposed in the prior art, after the riveting step to subject the already riveted element an additional embossing step, in which in the face of the setting head an additional spherically shaped indentation is formed, the Lochfüllverhalten particular in the region of the setting head to improve.

A disadvantage of this method, however, is that the additional embossing step is both time-consuming, and is cost-intensive by the necessary additional machine. In addition, it has been shown that the spherical impressions the

Not significantly improve bearing pressure, but quite the opposite, due to the imprint, the outer edge region of the setting head can easily lift, so that the setting head is no longer applied to the element to be riveted.

However, if the setting head is not attached to the element to be riveted, there is no longer any contact between the setting head and the elements to be riveted, which in turn impairs the positive connection of the riveted connection. Object of the present invention is therefore a rivet, a

Provide riveting and a riveting, so that in addition to a fast riveting method also provides an improved positive locking of the rivet in the riveting elements.

This object is achieved by a rivet according to claim 1, a riveting device according to claim 5 and a riveting according to

Claim 11.

The present invention is based on the idea of speeding up the riveting process by combining the riveting and embossing steps into one step. For this purpose, a riveting device is advantageously used, which has a receptacle for receiving a rivet, wherein the receptacle also has an embossing punch. As a result, an impression on a setting head of the rivet can already be formed during the pressing, that is to say during the actual riveting step. It is particularly advantageous if the receptacle is formed integrally with the die. In addition, the simultaneous has

Pressing with impressions the advantage that a Aufschirmmen, so the lifting of the edge of the setting head, can be reduced when imprinting.

In order to improve the screening even further, the invention proposes to use a rivet, which has a shielding and / or an undercut on its setting head. By shielding in the direction of riveting shaft can be counteracted the Aufschirmen on embossing. An alternatively or additionally configured undercut between setting head and rivet shank can

To compensate for unevenness in the element to be riveted, creating a

improved edition of the setting head is made possible on the element to be riveted. As a preferred embodiment shows, a Schirnnung of ca.0,05 to 0,1 mm or in other words a shielding at an angle of less than 10 ° has proven to be advantageous. Also advantageous is an undercut which is executed at an angle of more than 60 ° with respect to the rivet shank.

In a further preferred embodiment, the embossing or the die is not round, as known from the prior art, but has at least one indentation or a meandering, triangular, quadrangular, polygonal, star-shaped or flower-shaped circulatory contour. Due to this non-round imprint of the bearing pressure, in particular in the

Outside areas of the impression are changed so that the positive connection between the rivet and the elements to be riveted is improved.

Also advantageous is an embodiment in which the indentation has a sloping edge region, so that the inner contour profile of the indentation merges into a slope in the plane of the setting head.

Advantageously, the outer dimensions of the impression are smaller than the internal dimensions of the opening in the elements to be riveted. This has the advantage that the imprint directly improves the bearing behavior of the rivet in the opening.

In particular, in the manufacture of riveted clutch plates with drive plate and pad spring, the inventive method has proved to be advantageous.

When using a mounting table, in which the rivets in

Recordings are inserted, it is advantageous if the die has the largest possible contact surface. By the largest possible designed support surface tilting of the rivet from the perpendicular during the setting step can be prevented.

Further advantages and advantageous embodiments are in the

Subclaims, the description and the drawings defined.

In the following the invention will be described in detail with reference to preferred embodiments illustrated in the drawings. The embodiments shown are of an ex-natural nature and are not intended to define the scope of the invention. This is defined solely by the appended claims.

[0021] In the drawings:

1 shows a schematic representation of a first preferred embodiment of the rivet according to the invention;

2 shows a schematic representation of a second preferred embodiment of the rivet according to the invention;

3 shows a schematic representation of a third preferred embodiment of the rivet according to the invention;

4 shows an enlarged view of a portion of the embodiment shown in Figure 3;

5 shows a schematic plan view of a preferred

Embodiment of erfindungemäßen rivet with inventive imprinting; 6 shows a schematic cross-sectional view through a compressed rivet;

7 shows a schematic representation of a riveting device in various stages of the riveting method according to the invention;

8 shows an enlarged view of the riveting device from FIG. 7; and

9 shows a detail of a finished riveted element with rivet and embossing.

In the following description of the figures the same elements are marked with identical reference numerals.

Fig. 1 shows schematically a side view of a rivet 1 with a

Setting head 2 and a rivet shank 4. The rivet shank 4 can also have a conical end portion 6, to allow easy insertion of the rivet 1 in an opening or openings of elements to be riveted (not shown).

The rivet 1 according to the invention is advantageously used in the riveting method according to the invention described below. However, it will be apparent to one of ordinary skill in the art, and also within the scope of the invention, that the inventive rivet may be used in any other method.

According to the setting head 2 is shielded against the rivet shank 4. This means that the inner edge 8 of the setting head 2 has no substantially perpendicular angle to the outer surface 10 of the rivet shank 4, but that they are at an angle α relative to a substantially vertical

Alignment of the inner surface 8 of the setting head 2 is deflected. The angle α is preferably less than about 10 °, so that, for example, in a Flachkopfniet the Abnnaße 5.0 x 11.3 a Vorschirmung of about 0.05 to 0.1 mm is formed.

In addition to or instead of the shield, the rivet 1 can also be formed with a free seat 12. Such an exemplary embodiment is shown in FIG. 2, in which the setting head 2 of the rivet 1 has a free seat 12 on its inner surface 8 facing the rivet shank 4 in the region of the rivet shank 4. In this case, the free seat 12 is preferably designed such that it forms an angle β with the outer surface 10 of the rivet shank 4. This angle β is preferably greater than 60 °. The patio 12 can be created for example by milling or turning.

Particularly preferred is an embodiment in which both free seat 12, as well as a shield are available. Such an embodiment is shown in Figures 3 and 4, wherein Figure 4 is an enlarged view of the setting head in the area marked by A.

3 again shows a rivet 1 with a rivet shank 4 and a setting head 2, the inside 8 of the setting head 2 being pre-screened both against the rivet shank 4 and also having a free seat 12. This embodiment is clearly shown in Figure 4, in which the inner edge 8 is again an angle α relative to a substantially vertical orientation of the inner edge inclined. The substantially vertical orientation of the inner edge is shown in FIG. 4, and thus the course of the shielding is schematically indicated by the reference numeral 14 as a dashed line.

Also clearly visible in Figure 4 is the additional training of a free seat 12 in the area between setting head 2 and rivet shank. 4 The shield 14 and the free seat 12 serve to compensate, among other things, unevenness in the element to be riveted. These bumps can be at a substantially vertical execution of

Inner edge 8 of the setting head 2 cause the setting head 2 is not flat against the element to be riveted. If appropriate, this can even lead to the rivet shank not being aligned substantially parallel to the opening in the element to be riveted before the actual riveting operation, but being tilted, so that the hole filling behavior is impaired. Free seat 12 and shield 14, however, allow a plan concerns the inner surface 8 of the setting head 2 to the

riveting element, so that both the hole filling behavior is improved, and a particularly good contact between setting head 2 and riveting element is achieved.

Furthermore, the free seat 12 and the shield 14 have the advantage that a parachute, i. Bending of an edge region 16 of the setting head 2 during the formation of the embossment or in a subsequent embossing step is prevented.

The screen is formed by the fact that the material of the setting head 2 deformed by the pressure of the stamping die and a bulge in the area between setting head 2 and rivet shank 4 forms, which lifts the edge region 16 of the material to be riveted. Such a material accumulation or

Material deformation always occurs during embossing, ie also during embossing

According to the invention, however, in that the rivet 1 has a free seat 12 or a shielding 14, it can be filled with the material resulting from the embossing, so that an improved contact between the setting head 2 and the element to be riveted is achieved. 5 shows a plan view of a setting head 2 of a rivet 1 with an indentation 20, wherein the indentation 20 has a star-shaped outer contour 22, which merges into the surface 24 of the setting head 2, and an embossed recessed surface 26, which of an inner contour 28 is limited.

The imprint 20 itself may have any shape. However, it should show the largest possible and shallow recessed area 26. The

Circumferential contour 22, 28 of the indentation 20 may be triangular, quadrangular, star-shaped, flower-shaped or meander-shaped. The star-shaped meandering shape, which is shown schematically in FIG. 5, has proved to be particularly advantageous.

The edge region 30 between inner contour 28 and outer contour 22 is preferably chamfered, so that the surface 24 of the setting head 2 merges via the chamfered edge region 30 into the recess surface 26 of the embossment 20.

Preferably, the maximum diameter D of the indentation 20 is smaller than the inner diameter of the openings in the elements to be riveted. The dimensions are shown schematically in Fig.6 again.

Fig. 6 shows a cross-section through a rivet 1, which is guided through openings 32, 24, in two elements 36, 38 and pressed therein, so that the two elements 36, 38 are riveted together. This also means that the rivet shank 4 is deformed in such a way that the openings 32, 34 in the elements 36 and 38 are filled up with material of the rivet shank 4, and the rivet shank 4 also has a deformed area 40 at its end area, which has the two riveted

Elements 36 and 38 are contacted at the "bottom" 42. The "top" 44 of the riveted elements contacts the inside 8 of the setting head 2. In addition, Figure 6 shows schematically the indentation 20 with the embossed recess surface 26 and the beveled edge region 30. In addition, Figure 6 shows that the maximum diameter D that is the maximum dimensions of the indentation 20 are smaller than the inner diameter d of the openings 32nd , 34. This has the advantage that the embossment 20 and thus the increase of the bearing pressure in the region of the embossing leads to a better hole filling behavior of the rivet 1 within the opening 32, 34, and not to a mere deformation of the setting head 2.

In Figures 7 to 9, the riveting method according to the invention and the riveting device according to the invention is described schematically.

Although it is advantageous for the rivets described in Figures 1 to 6 to use, but it is also possible and included by the scope of the invention that conventional, known from the prior art rivets are used.

7 shows a plan view of a riveting device for riveting

Drive plate and pad springs for producing a clutch disc. FIG. 7 shows the riveting device 46 at different stages during the process

Riveting.

Although the method is explained below with reference to the example of a clutch disc to be riveted with drive plate and pad springs, it is obvious to one skilled in the art that the inventive method can also be used for riveting of other elements.

In FIG. 7, the area marked I corresponds to the state of the riveting device 46 before the riveting process or after removal of the finished area

Clutch disc. As shown, the riveting device 46 has receptacles 48 which also equipped with an embossing stamp 50. The embossing punch 50 is, as shown here, preferably star-shaped or with a meandering

Circumferential contour formed and has a flat support surface 52. This can be seen in particular in the enlarged view of FIG. The support surface 52 is formed as large as possible, so that a rivet 1 on her, im

Essentially perpendicular, can be arranged.

The vertical arrangement of a rivet 1 can also be clearly seen in the enlarged detail of FIG. Overall, the arrangement of the rivets 1 takes place in a first method step, in which the receptacles 48 are equipped with rivets 1. This process stage is shown in FIG. 7 in the image section area II. In picture detail III it is shown that on the set rivets, the first element to be riveted 36, here a pad spring, is set such that the rivets 1 protrude through openings 32 in the pad spring 36. In a further step (see image detail IV), the second element 38 to be riveted, which in the case shown in FIG. 7 is a driver disk, is arranged above the lining springs 36, the rivets 1 again projecting through openings 34 provided in the driver disk. Placing the rivets and then placing them to

riveting elements above the rivets is also called setting step.

If the elements 36, 38 to be riveted finish arranged, all rivets are pressed simultaneously. During this compression, the actual

Riveting, is simultaneously on the punch 50 in the face of the

Setting head 2, the indentation 20 formed so that the bearing behavior of the rivet is particularly good. When the clutch plate is fully compressed, it is removed from the riveting device 46 so that the riveting device 46 is ready for riveting two elements again. 9 shows a plan view of a finished riveted clutch disc consisting of pad spring 36 and Mitnehnnerscheibe 38 which is riveted to a rivet 1. From rivet 1, however, only the setting head 2 with imprint 20 can be seen.

As can be seen clearly from FIG. 9, the depression surface 26 merges via a bevelled edge region 30 into the setting head surface 24. As described above, the meandering or star-shaped allows

Circumferential contour of the indentation 20, that the bearing pressure is improved, in particular in the region of the setting head. As a result, the positive connection of the two riveted elements can be improved.

LIST OF REFERENCE NUMBERS

rivet

setting head

rivet

conical end of the rivet shaft

Inner surface of the setting head

Outer surface of rivet shaft

outdoor seating

shielding

Edge area of the setting head

impressing

outer contour

Setting head area

depression area

inner contour

border area

Opening in first element to be riveted, inbes. Pad spring opening in second element to be riveted, inbes. Take-up disc first element to be riveted, inbes. lining spring

second element to be riveted, inbes. driving plate

deformed end of the rivet

Rivet contact area on second element to be riveted

Rivet contact area on the first element to be riveted

riveter

admission

dies 52 supporting surface of the embossing stamp

D External dimension of the imprint d Internal dimension of the opening

Claims

Claims:

1. rivet, in particular Flachkopfniet, for riveting at least two elements (36, 38) of a drive train in a vehicle with a setting head (2) and a rivet shank (4), characterized in that the setting head (2) has a shield (14) and / or has an undercut (12).

2. Rivet (1) according to claim 1, wherein the shield (14) in the direction of

Rivet shaft is formed and preferably has an angle of less than 10 °.

3. rivet (1) according to claim 1 or 2, wherein the undercut (12) between the setting head (2) and rivet shank (4) is formed and preferably at an angle of more than 60 ° with respect to the rivet shank (4) is executed.

4. Rivet (1) according to one of the preceding claims, wherein the rivet (1) is adapted to be arranged substantially perpendicular to a riveting device (46).

5. A riveting device (46) for riveting at least two elements (36, 38) of a drive train in a vehicle, comprising a workpiece carrier adapted to allow the at least two elements (36, 38) of the drive train to be riveted thereto, and the workpiece carrier has at least one receptacle (48) for a rivet (1) into which a setting head (2) of the rivet (1) can be received, characterized in that the receptacle (48) has an embossing punch (50).

6. riveting device (46) according to claim 5, wherein the embossing punch (50) integral with the receptacle (48) is formed.

7. riveting device (46) according to claim 5 or 6, wherein the embossing punch (50) has a flat bearing surface (52), preferably a bearing surface (52) whose Außennnaße (D) are smaller than the Innennnaße (d) of openings (32, 34) in the elements to be riveted (36, 38).

8. riveting device (46) according to any one of claims 5 to 7, wherein the

Embossing punch (50) has a beveled edge region (30).

9. riveting device (46) according to any one of claims 5 to 8, wherein the

Embossing punch (50) is triangular, square, polygonal, star-shaped or flower-shaped or at least one indentation or a meandering

Circumferential contour (22, 28).

10. riveting device (46) according to one of claims 5 to 9, wherein the receptacle (48) is adapted to a rivet (1) according to one of claims 1 to 4

take.

11. A method for riveting at least two elements (36, 38) of a

Drive train in a vehicle with a rivet (1), in particular a

Flat head rivet, with a setting head (2) and a rivet shank (4), wherein in a setting step, a rivet (1) by one at the riveting elements (36, 38) formed opening (32, 34) is guided and in a riveting step in that the rivet shank (4) is deformed in such a way that the elements (36, 38) are positively connected, characterized in that an additional imprint (20) is impressed into the setting head (2) during the riveting step.

12. The method of claim 11, wherein the indentation (20) has a shallow recess (26), wherein preferably the outer dimensions (D) of the indentation (20) are smaller than the inner dimensions (d) of the openings (32, 24) in the Elements (36, 38).

13. The method according to claim 11 or 12, wherein the indentation (20) has a to the surface (24) of the setting head (2) obliquely rising edge region (30)

14. The method according to one of claims 11 to 13, wherein the indentation (20) is triangular, quadrangular, polygonal, star-shaped or flower-shaped or at least one indentation or a meandering circulating contour (22, 28).

15. The method according to any one of claims 11 to 14, wherein a rivet (1) is used according to one of claims 1 to 4.

16. The method according to any one of claims 11 to 15, wherein a riveting device (46) is used according to one of claims 5 to 10.