DE112018001521T5 - METHOD FOR MANUFACTURING A BUMP DAMPING DEVICE AND DEVICE OBTAINED BY THIS METHOD - Google Patents

Abstract

Pendulum damping device (1, 11) of the type comprising at least one pendulum mass (2, 20) movably mounted on a holder (4), the pendulum mass (2, 20) being formed of two pendulum weights (3, 17) resting on arranged on one and on the other side of the holder (4) and connected between two inner surfaces (5) by at least one web (6) which is fastened with at least one rivet (23) and a slot (10) of the holder (4 ), wherein between the holder (4) and the pendulum mass (2, 20) a roller is arranged, characterized in that the rivet (23) has two closing heads (25).

Description

TECHNICAL FIELD OF THE INVENTION

The present invention relates to a method for producing a pendulum damping device, in particular a motor vehicle, as well as the device obtained by this method.

TECHNOLOGICAL BACKGROUND OF THE INVENTION

Such a device, which is also referred to as a pendulum oscillator or pendulum, is particularly intended to equip a transmission device of a motor vehicle.

In a motor vehicle transmission device, generally at least one torsion damping system is associated with a clutch that can selectively connect the engine to a transmission, such as a friction clutch or a device for hydrokinematical coupling with a lockup clutch.

Because of the successive explosions in the cylinders of the engine, namely, an internal combustion engine generates nonuniformities, these nonuniformities varying in particular depending on the number of cylinders.

The damping system, which conventionally includes springs and friction pendulum weights, thus has the function of filtering the torsional vibrations due to the rotational non-uniformities of the engine and intervenes prior to transmitting the engine torque to the transmission. This can prevent that such vibrations reach the gearbox and generate shocks, noise and noise that are undesirable.

In order to further improve the filtering, it is known to use a pendulum damping device in addition to the usual damping system.

An example of a pendulum damping device is in the patent application FR2981714 in the name of the Applicant. This device comprises an annular holder which is intended to be rotated about its axis and two-part pendulum masses mounted peripherally on one and on the other side of the holder.

With webs that traverse slots in the holder, the two parts of the pendulum masses are connected by riveting. A roller is mounted between a runway formed at each land and an edge of the corresponding slot of the holder.

In this device, the closing heads bear against the radial outer surfaces of the pendulum masses and protrude axially from these surfaces. The volume swept during operation is relatively large, which makes it necessary to dimension the surrounding parts accordingly.

In the patent application FR3009853 , also in the name of the applicant, the rivets are omitted in an assembly process by inserting the ends of the webs with force in the openings of the pendulum masses and thus eliminates this disadvantage.

However, the implementation of a method of mounting the pendulum masses by conventional riveting may still be advantageous because it has the advantage of being simpler than this latter method, although it has other known disadvantages.

With a conventional riveting (rivet with a head and a closing head) on a large thickness (of more than 15 mm), in particular, the hole on the head side can not be filled correctly.

The inventions department is aware of a countermeasure which is to progressively enlarge the holes as one approaches the closing head, this countermeasure not being applicable when end parts, such as each piece of pendulum mass, are one and the same.

By shot peening of the head also the filling on the side of the rivet can be optimized, but not the homogeneous filling of the assembly can be ensured, from which a good resistance of the webs is dependent on the ejection.

Another difficulty is the formation of holes in a sheet when a diameter of the holes is smaller than the thickness of the sheet.

In a particular model of the pendulum damping device manufactured by the Applicant, since the pendulum masses have a thickness of 8 mm, a rivet hole must have a diameter of 8 mm, or a rivet with a nominal diameter of 6 mm would be ideal in terms of space consumption.

GENERAL DESCRIPTION OF THE INVENTION

The object of the present invention is thus a method for producing a Pendulum damping device, in which the above disadvantages are eliminated.

The method in question is of the type comprising a step of assembling at least one pendulum mass movably mounted on a holder, this pendulum mass being formed of two pendulum weights which are on one and on the other side of the pendulum Holder arranged and between inner surfaces by at least one web which passes through a slot of the holder, are connected, wherein between the pendulum mass and the holder is arranged a roller.

• - eine erste Phase, in der durch Stanzen erste Löcher mit einem ersten vorbestimmten Durchmesser in jedem der Pendelgewichte ausgebildet werden, wobei der erste vorbestimmte Durchmesser zumindest gleich einer Dicke jedes der Pendelgewichte ist;
• - eine zweite Phase, in der an einer Außenfläche der Pendelgewichte durch Stanzen eine konische Bohrung über eine vorbestimmte Tiefe in jedem der ersten Löcher ausgebildet wird und ein Material dieser Pendelgewichte in die ersten Löcher zurückgeschoben wird;
• - eine dritte Phase, in der durch Stanzen zweite Löcher mit einem zweiten vorbestimmten Durchmesser in den ersten Löchern ausgebildet werden;

wobei eine Differenz zwischen der Dicke jedes der Pendelgewichte und der vorbestimmten Tiefe höchsten gleich dem zweiten vorbestimmten Durchmesser ist.The method according to the invention for producing a pendulum damping device comprises an introductory step which comprises:

• a first phase in which first holes are formed by punching with a first predetermined diameter in each of the pendulum weights, the first predetermined diameter being at least equal to a thickness of each of the pendulum weights;
• a second phase in which a conical bore is formed on an outer surface of the pendulum weights by punching over a predetermined depth in each of the first holes and a material of these pendulum weights is pushed back into the first holes;
• a third phase in which second holes are formed by punching with a second predetermined diameter in the first holes;

wherein a difference between the thickness of each of the pendulum weights and the predetermined depth is at most equal to the second predetermined diameter.

The initiating step may also include a phase for sinking the outer surfaces of the pendulum weights around the conical bore. Countersinking allows the conical bore to be spaced from the outer surfaces of the pendulum weights.

The depth of the conical bore and countersink may be between 50% and 70%, preferably between 57% and 62%, preferably 60% of the axial thickness of the pendulum weight.

• - eine erste Sequenz zum Einfügen eines Niets, der durch einen Metallschaft mit einem nominalen Durchmesser, der im Wesentlichen gleich dem zweiten vorbestimmten Durchmesser ist, gebildet ist, in jedes der zweiten Löcher;
• - eine zweite Sequenz zur Bildung von zwei Schließköpfen durch Eindrücken der Enden dieses Niets, wobei jeder der Schließköpfe in der konischen Bohrung im Wesentlichen versenkt ist.

In the method according to the invention for producing a pendulum damping device, the assembly step comprises the following:

• a first sequence for inserting a rivet formed by a metal shaft having a nominal diameter substantially equal to the second predetermined diameter into each of the second holes;
• a second sequence for forming two closing heads by indenting the ends of this rivet, each of the closing heads in the conical bore being substantially recessed.

When a countersinking phase is performed, it is possible by this countersinking not to damage or deform the outer surfaces of the pendulum weights when pressing in the ends of the rivet. By countersinking it is also possible that the rivet does not protrude axially from the outer surfaces of the pendulum weights.

In the method according to the invention for producing a pendulum damping device, a degree of filling of the conical bore is more than 80%, preferably more than 90%.

Furthermore, according to the invention, all processes from the first sequence to the second sequence are carried out in a cold way.

Furthermore, according to the invention, the material of the pendulum weights can be a steel sheet with a first Vickers hardness, which is between 100 and 450 Hv. The material of the metal shaft can have a Brinell hardness between 40 and 100 HrB.

Further, according to the present invention, independently of each other or in combination, the first predetermined diameter may be 8 mm, the second predetermined diameter may be 6 mm, the predetermined depth may be 2 mm, and the thickness may be 8 mm and the depth of the countersink 2 mm.

The invention also relates to a pendulum damping device of the type with at least one pendulum mass, which is movably mounted on a holder, said pendulum mass is formed of two pendulum weights disposed on one and on the other side of the holder and between two inner surfaces by at least one web are connected, which is fastened with at least one rivet and passes through a slot of the holder, wherein between the holder and the pendulum mass a roller is arranged.

According to the invention, this rivet is characterized in that it has two closing heads.

These closing heads are advantageously at least partially sunk in conical bores of the outer surfaces of the pendulum weights.

The outer surfaces of the pendulum weights may have a countersink around the conical bore. The depth of the conical bore and countersink may be between 50% and 70%, preferably between 57% and 62%, preferably 60% of the axial thickness of the pendulum weight.

In the pendulum damping device according to the invention, a degree of filling of these conical bores is more than 80%, preferably more than 90%.

With these few essential details will be apparent to those skilled in the benefits that offers the pendulum damping device according to the invention over the prior art.

The roller carrying the displacement of the pendulum mass with respect to the holder can be arranged between the web, which then forms a roller bar, and an edge of the slot. As a variant, the roller is disposed between openings formed directly in the two pendulum weights and a slot different from the slot crossed by the bar. In this variant, the openings of the pendulum weights are offset axially to the slots of the holder.

Preferably, two rollers lead the displacement of the pendulum mass. The device preferably comprises between 2 and 8 pendulum masses, preferably between 3 and 6 pendulum masses.

The detailed description of the invention will be given in the following description taken in conjunction with the accompanying drawings. It should be noted that these drawings are merely illustrative of the text of the description and are not in any way limiting of the scope of the invention.

list of figures

• 1a and 1b are a partial view of a known from the prior art pendulum damping device showing a pendulum mass, or an axial section of this pendulum mass, which shows its installation with a rivet.
• 2 is a simplified block diagram of a method according to the invention for producing a pendulum damping device.
• 3a and 3b are a partial view of a pendulum damping device according to the invention, which shows a pendulum mass, or an axial section of this pendulum mass, showing its installation with a rivet.

DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION

In the pendulum damping device shown in the prior art 1 partially in 1a is shown is a pendulum mass 2 from two pendulum weights 3 formed on one side and on the other side of an annular holder 4 are arranged.

As with the axial cut out 1b good to see are the pendulum weights 3 over at least one jetty 6 (In the illustrated example, three webs) between inner surfaces 5 connected. This bridge is characterized by at least one rivet (in the example shown two rivets), in which a head 7 and a closing head 8th from the outside surfaces 9 the pendulum weights 3 stand out, fastened.

In known manner, the bridge 6 a runway for a roll (not shown), on the other hand, on an edge of a slot 10 of the owner 4 rolls.

With a pendulum movement of the pendulum mass 2 if the holder 4 is about the axis XX ', that's from the heads 7 and the closing heads 8th the rivet 7 . 8th swept volumes relatively large, which makes it necessary to dimension the surrounding parts accordingly, as has already been stated in the introduction to the description.

With the inventive method for producing a pendulum damping device 11 , this in 2 is illustrated, this disadvantage is eliminated.

Conventionally, such a manufacturing method comprises a step for mounting 12 an assembly of pendulum weights 13 on the annular holder 4 for forming the pendulum damping device 11 ,

The assembly of pendulum poems 13 is mostly starting from a metal sheet 15 in an introductory step 14 produced.

• - Eine erste Phase 16, in der durch Stanzen erste Löcher mit einem ersten Durchmesser von 8 mm in Pendelgewichten 17 ausgebildet werden, welche ausgehend von einem Stahlblech 15 mit einer Dicke von 8 mm erhalten werden. Diese erste Phase 16 stellt keine Probleme hinsichtlich der Durchführbarkeit dar, da der erste Durchmesser zumindest gleich der Dicke der Pendelgewichte 17 ist.
• - Eine zweite Phase 18, in der durch Stanzen an der Außenfläche 9 der Pendelgewichte 17 eine konische Bohrung 19 auf einer Tiefe von 2 mm (in 3b gezeigt, die eine Pendelmasse 20 am Ende des Montageschritts 12 zeigt) in den ersten Löchern ausgebildet wird und das Metall der Pendelgewichte 17 in diese ersten Löcher zurückgeschoben wird.
• - Eine dritte Phase 21, in der durch Stanzen zweite Löcher mit einem zweiten Durchmesser von 6 Millimeter am Boden der ersten gebohrten Löcher ausgebildet werden. Da eine verbleibende Dicke, die am Boden der ersten Löcher durchzubohren ist, nur noch 6 Millimeter beträgt, stellt auch diese dritte Phase 21 kein Problem hinsichtlich der Durchführbarkeit dar, da der zweite Durchmesser zumindest gleich dieser verbleibenden Dicke ist.

In the production method according to the invention 12 . 14 includes the introductory step 14 following:

• - a first phase 16 in which by punching first holes with a first diameter of 8 mm in pendulum weights 17 be formed, which starting from a steel sheet 15 obtained with a thickness of 8 mm. This first phase 16 presents no problems in terms of feasibility, since the first diameter at least equal to the thickness of the pendulum weights 17 is.
• - A second phase 18 in which by punching on the outer surface 9 the pendulum weights 17 a conical bore 19 at a depth of 2 mm (in 3b shown a pendulum mass 20 at the end of the assembly step 12 shows) is formed in the first holes and the metal of the pendulum weights 17 pushed back into these first holes.
• - A third phase 21 in which second holes having a second diameter of 6 millimeters are formed by punching at the bottom of the first drilled holes. Since a remaining thickness, which is drilled at the bottom of the first holes, is only 6 millimeters, this is also the third phase 21 no problem in terms of feasibility, since the second diameter is at least equal to this remaining thickness.

The prepared assembly of pendulum weights 13 can during the assembly step 12 on the holder 4 be attached.

• - eine erste Sequenz 22 zum Einsetzen eines Niets 23, der durch einen Metallschaft mit einem nominalen Durchmesser von 6 mm gebildet ist, in jedes der zweiten Löcher;
• - eine zweite Sequenz 24 zur Bildung von zwei Schließköpfen 25 durch Eindrücken der Enden des Niets 23. Wie in 3b gut zu sehen ist, ist jeder dieser Schließköpfe 25 im Wesentlichen in der konischen Bohrung 19 versenkt. Auf diese Weise stehen die Niete 23 nicht von den Pendelgewichten 17 hervor, wie in 3a gut zu sehen ist, die ein zusammengesetztes Produkt (in einer Teilansicht) zeigt. Eine Ansenkphase während des einleitenden Schritts 14 könnte auch vorgesehen sein, um einen axialen Abstand zwischen den Nieten 23 und den Außenflächen 9 zu lassen. Das Ansenken kann eine Tiefe von 2 mm haben.

In the production method according to the invention, this assembly step comprises the following:

• - a first sequence 22 for inserting a rivet 23 formed by a metal shaft having a nominal diameter of 6 mm into each of the second holes;
• - a second sequence 24 for the formation of two closing heads 25 by pressing in the ends of the rivet 23 , As in 3b good to see is each of these closing heads 25 essentially in the conical bore 19 sunk. That's how the rivets stand 23 not from the pendulum weights 17 as in 3a good to see a composite product (in a partial view) shows. An initial phase during the introductory step 14 could also be provided to an axial distance between the rivets 23 and the outer surfaces 9 allow. The countersinking can have a depth of 2 mm.

With the manufacturing method described above, it is possible to have a degree of filling of the conical bore 19 of more than 80% with a good homogeneity, giving a good resistance of the pendulum mass 20 while skidding ensures.

The processes of these assembly sequences 22 . 24 . 26 are cold.

The steel sheet used 15 preferably has a first Vickers hardness, which is between 100 and 450 Hv, and the metal shank of a rivet 23 advantageously has a Brinell hardness of between 40 and 100 HrB.

Of course, the invention is not limited only to the preferred embodiments described above.

Specifically, the dimensions given correspond only to a model of a particular pendulum damping device developed by the Applicant and to the assembly with rivets 23 with a nominal diameter of 6 mm, while the sheet to be punched 15 has a thickness of 8 mm. The person skilled in the art will adapt the production method according to the invention as far as necessary to other nominal diameters of the rivet 23 and to other thicknesses of the sheets 15 to adjust.

Rather, the invention thus encompasses all possible variants within the scope of the subject matter of the following claims.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• FR 2981714 [0007]
• FR 3009853 [0010]

Claims (10)

A method of manufacturing (12, 14) a pendulum damping device (1, 11) of the type comprising a step of mounting (12) at least one pendulum mass (2, 20) movably mounted on a holder (4), the pendulum mass (2, 20) is formed of two pendulum weights (3, 17) arranged on one and on the other side of the holder (4) and between inner surfaces (5) by at least one web (6) having a slot (10 ) of the holder (4), wherein a roller is arranged between the pendulum mass and the holder, characterized in that it comprises an introductory step (14) comprising: - a first phase (16) in which forming first holes having a first predetermined diameter in each of the pendulum weights (17) by punching, the first predetermined diameter being at least equal to a thickness of each of the pendulum weights (17); - A second phase (18) in which on an outer surface (9) of the pendulum weights (17) by punching a conical bore (19) over a predetermined depth in each of the first holes is formed and a material of the pendulum weights (17) in the first holes pushed back; a third phase (21) in which second holes are formed by punching with a second predetermined diameter in the first holes; wherein a difference between the thickness and the predetermined depth is at most equal to the second predetermined diameter. Method for producing (12, 14) a pendulum damping device (11) according to Claim 1 characterized in that the initiating step also includes a phase for sinking the outer surfaces (9) of the pendulum weights around the conical bore. Method for producing (12, 14) a pendulum damping device (11) according to one of Claims 1 and 2 characterized in that the mounting step (12) comprises: - a first sequence (22) for inserting a rivet (23) through a metal shaft (23) having a nominal diameter substantially equal to the second predetermined diameter; is formed in each of the second holes; - A second sequence for forming two closing heads (25) by pressing the ends of the rivet (23), wherein each of the closing heads (25) in the conical bore (19) is substantially recessed. Method for producing (12, 14) a pendulum damping device (11) according to one of the preceding claims Claims 2 or 3 , characterized in that a degree of filling of the conical bore (19) is more than 80%, preferably more than 90%. Method for producing (12, 14) a pendulum damping device (11) according to one of the preceding claims Claims 2 to 4 , characterized in that all operations from the first sequence (22) to the second sequence (24) are carried out in a cold way. Method for producing (12, 14) a pendulum damping device (11) according to one of the preceding claims Claims 2 to 5 characterized in that the material is a steel sheet (15) having a first Vickers hardness which is between 100 and 450 Hv, and a material of the metal shank (23) has a Brinell hardness of between 40 and 100 HrB. Method for producing (12, 14) a pendulum damping device (11) according to one of the preceding claims Claims 1 to 6 characterized in that the first and second predetermined diameters are 8 mm and 6 mm, the predetermined depth is 2 mm and the thickness is 8 mm. Pendulum damping device (1, 11) of the type comprising at least one pendulum mass (2, 20) movably mounted on a holder (4), the pendulum mass (2, 20) being formed of two pendulum weights (3, 17) resting on arranged on one and on the other side of the holder (4) and connected between two inner surfaces (5) by at least one web (6) which is fastened with at least one rivet (23) and a slot (10) of the holder (4 ), wherein between the holder (4) and the pendulum mass (2, 20) a roller is arranged, characterized in that the rivet (23) has two closing heads (25). Pendulum damping device (11) after the preceding Claim 8 , characterized in that the closing heads (25) at least partially in conical holes (19) of the outer surfaces (9) of the pendulum weights (17) are sunk. Pendulum damping device (11) after the preceding Claim 9 , characterized in that a degree of filling of the conical bores (19) is more than 80%, preferably more than 90%.

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