EP2040874A2 - Vehicle seat structure - Google Patents

Vehicle seat structure

Info

Publication number
EP2040874A2
EP2040874A2 EP07801137A EP07801137A EP2040874A2 EP 2040874 A2 EP2040874 A2 EP 2040874A2 EP 07801137 A EP07801137 A EP 07801137A EP 07801137 A EP07801137 A EP 07801137A EP 2040874 A2 EP2040874 A2 EP 2040874A2
Authority
EP
European Patent Office
Prior art keywords
structural parts
sonotrodes
vehicle seat
welding
structural
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07801137A
Other languages
German (de)
French (fr)
Inventor
Eckhard Kirch
Heiko Utsch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Johnson Controls Components GmbH and Co KG
Original Assignee
Keiper GmbH and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Keiper GmbH and Co filed Critical Keiper GmbH and Co
Publication of EP2040874A2 publication Critical patent/EP2040874A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/68—Seat frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/64—Back-rests or cushions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/68—Seat frames
    • B60N2/682—Joining means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/006—Vehicles

Definitions

  • the invention relates to a structure of a vehicle seat having the features of the preamble of claim 1.
  • Known supporting structures of vehicle seats have structural parts which are stamped from thin sheet steel and welded together, for example by means of laser welding.
  • the invention is based on the object to improve a structure of the type mentioned. This object is achieved by a structure having the features of claim 1. Advantageous embodiments are the subject of the dependent claims.
  • vehicle seat structures are said to have materials with high weight-specific stiffness, strength, and energy absorption to increase occupant safety, and on the other hand use lightweight materials to reduce the overall weight.
  • the production of load and weight optimized structures is achieved by the combination of different materials, i. Hybrid structures are created.
  • the structural parts are made of different materials and are joined together by means of ultrasound welding at at least one contact point, a low-cost, low-cost hybrid structure is available which provides the necessary strength.
  • the materials may be aluminum / aluminum alloys on the one hand and steel on the other hand.
  • other materials are possible, for example glass-fiber reinforced or other fiber-reinforced plastics, for example in combination with one of the metals mentioned.
  • Two or more structural parts can be connected together at the same time. The connection at several contact points at the same time, for example by means of several, possibly different sonotrodes an ultrasonic device is possible.
  • the structure is preferably the supporting structure of a backrest of a vehicle seat, but may also be the supporting structure of a seat part.
  • base plates and spars are connected to each other. It could, for example, side parts and crossbeams are interconnected.
  • FIG. 2 is a schematic side view of a vehicle seat
  • FIG. 3 shows a section through the exemplary embodiment along the line III-III in Fig. 1,
  • Fig. 5 is a partially sectioned and schematic representation of a known
  • FIG. 6 is a schematic partial view of the ultrasonic welding device with tilted sonotrode and matching workpieces
  • FIG. 9 is a side view of Fig. 8, and
  • FIG. 10 shows a perspective partial view of the ultrasound apparatus with mutually offset sonotrodes of alternating type.
  • a vehicle seat 1 of a motor vehicle has a seat part 3, which is connected to the vehicle structure S of the motor vehicle, and a backrest 6, which is pivotable relative to the seat part 3 and which is hinged to the seat part 3 on both sides.
  • the backrest 6 is locked to the seat part 3 or the vehicle structure S.
  • the vehicle seat 1 is a rear seat with split backrest, ie the backrest 6 is the 1/3 part or 2/3 part of said split backrest.
  • the backrest 6 has a load-bearing structure 10, which as structural parts comprises a base plate 12 and at least one spar 14.
  • the base plate 12 is substantially flat. It may have beads to reinforce it.
  • the spar 14 has a substantially U-shaped profile. In the present case, a plurality of spars 14 are connected to one another to form a peripheral frame, in some cases also formed in one piece with one another.
  • the existing spars 14 are arranged on the - facing the occupant in the seat - front of the base plate 12 and with this - to form box sections - connected.
  • the structure 10 thus formed is also padded on the front side of the base plate 12.
  • the back of the base plate 12 is directly facing the cargo space, possibly only painted or veneered, and can extend the loading floor at vorwenkter backrest 4.
  • the base plate 12 is in the embodiment of aluminum, more in the present case alloyed aluminum sheet Al Mg 4.5 Mn in a thickness of, for example, 0.7 mm or 1.0 mm.
  • the spar 14 is in the embodiment of steel, more specifically in the present case steel sheet in a thickness of 0.7 mm.
  • the spar 14 and the base plate 12 are ultrasonically welded together, i. connected by ultrasonic welding.
  • a per se known ultrasonic welding apparatus 100 has an anvil 101 (base plate), a relative to the anvil 101 fixed stand 103 and a relative to the stator 103 movable, in this case vertically movable slide 105.
  • the carriage 105 comprises a guide and receptacle for a feed unit 111, which is mounted relative to the carriage 105 movable, in particular in parallel, in said guide and receiving the carriage 105.
  • the feed unit 111 is thus movable relative to the anvil 101.
  • the feed unit 111 is acted on by a pneumatic cylinder 113 supported on the carriage 105, the piston 115 of which is actuated by means of a piston rod 116 and an attenuator 117 and a force rod.
  • Meßdose 119 in series present the feed unit 111 in this case acted upon on its upper side.
  • a return spring 121 biases the feed unit 111 in the direction of the pneumatic cylinder 113.
  • the feed unit 111 encloses a converter 125 which converts a high voltage generated by a generator 127 into ultrasound.
  • the ultrasound is transmitted through a booster 129 to one or more sonotrodes 131 at the tip of the advancing unit 111, i. present at the bottom.
  • the sonotrodes 131 set on the one workpiece, wherein the other workpiece rests on the boss 101, i. the workpieces are arranged between the sonotrodes 131 and the anvil 101.
  • the pneumatic cylinder 113 builds up a static pressure, so that the two workpieces in contact points P biased against each other, controlled and controlled by the load cell 119th
  • the ultrasound introduced into the upper workpiece via the sonotrodes 131 heats the materials (steel / aluminum) at the prestressed contact points P to approximately 300 ° -400 ° C. In this physical contact, an atomic interaction between the materials occurs, with aluminum atoms diffuse into the steel surface.
  • the spar 14 is welded to the base plate 12.
  • the welded joint is arranged in size and contour so that the required energy absorption of the structure 10 is ensured in terms of their strength.
  • a plurality of sonotrodes 131 simultaneously weld a plurality of contact points P in a plane between the spar 14 and the base plate 12.
  • the weld can be dimensioned differently according to the loads to be absorbed, which can also be achieved by the different sonotrodes 131.
  • the possible basic forms of Welding surfaces at the contact points P may in particular be annular, square or circular.
  • the stand 103 can act as a boundary for the base plate 12 when inserting the workpieces, i. define the maximum possible distance of a contact point P to the edge of the base plate 12.
  • the sonotrode 131 can be tilted, i. relative to the stand 103 and to the direction of movement of the carriage 105.
  • the entire feed unit 111 is tilted relative to the direction of movement of the carriage 105. Accordingly, the anvil 101 and the workpieces are tuned to this. A portion of the anvil 101 is tilted at the same angle.
  • the spar 14 has a correspondingly angled welding flange 14a, and the base plate 12 is shaped accordingly.
  • 6 shows a partial view of an ultrasound welding device 100 modified in this way.
  • the associated horns 131 In order to reduce the dot pitch between two pads P, it is advantageous to feed the associated horns 131 alternately from different sides with respect to the plane through the pads P, for example alternately from above and from below, as in Fig. 8 and in side view thereto Fig. 9 shown.
  • the anvil 101 has accordingly alternately arranged areas. Some of the sonotrodes 131 and portions of the anvil 101 are then connected to the feed unit 111, the others fixed. A combination with the tilted sonotrodes 131 of FIG. 6 and / or 7 is also possible.
  • Fig. 10 it is shown how a plurality of sonotrodes 131 of alternating type are arranged offset by 90 ° to each other.
  • Two sonotrodes 131 of the "toroidal sonotrode” type are shown, which rotate about their longitudinal axis during welding.
  • hen hen and end side present two (for example, cam-like) effective surfaces 131 a.
  • These two sonotrodes 131 are perpendicular to the plane of the base plate 12 with longitudinal axis.
  • three sonotrodes 131 of the "linear lambda sonotrode” type are shown, which move linearly during welding perpendicular to their longitudinal axis and radially four (for example, cam-like) Have effective surfaces 131 a, of which, however, only two are in use at the same time (the other two active surfaces serve as a substitute for wear).
  • These three sonotrodes 131 are arranged (with portal support) in a plane parallel to the base plate 12 and move within this plane perpendicular to its longitudinal axis.
  • one of the three sonic probes 131 of the "linear lambda sonotrode” type is arranged between the two sonotrodes 131 of the “torsional sonotrode” type, and this triple group is located between the two other sonotrodes 131 of the "linear” type Lambda sonotrode "arranged.
  • the directions of movement of the sonotrodes 131 are indicated by arrows in FIG.
  • ten spot welds can be generated simultaneously (and at a small distance).
  • the distances between the five sonotrodes 131 are the same, so that five equally spaced pairs of two spot welds at the ten contact points P arise.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Seats For Vehicles (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Resistance Welding (AREA)

Abstract

Disclosed is a vehicle seat (1) structure (10) in which at least two structural parts (12, 14) are connected to each other at least at one contact point (P) by means of ultrasonic welding.

Description

Struktur eines Fahrzeugsitzes Structure of a vehicle seat
Die Erfindung betrifft eine Struktur eines Fahrzeugsitzes mit den Merkmalen des Oberbegriffs des Anspruches 1.The invention relates to a structure of a vehicle seat having the features of the preamble of claim 1.
Bekannte tragende Strukturen von Fahrzeugsitzen weisen Strukturteile auf, die aus dünnem Stahlblech gestanzt und miteinander verschweißt sind, beispielsweise mittels Laserschweißen.Known supporting structures of vehicle seats have structural parts which are stamped from thin sheet steel and welded together, for example by means of laser welding.
Der Erfindung liegt die Aufgabe zu Grunde, eine Struktur der eingangs genannten Art zu verbessern. Diese Aufgabe wird erfindungsgemäß durch eine Struktur mit den Merkmalen des Anspruches 1 gelöst. Vorteilhafte Ausgestaltungen sind Gegenstand der Unteransprüche.The invention is based on the object to improve a structure of the type mentioned. This object is achieved by a structure having the features of claim 1. Advantageous embodiments are the subject of the dependent claims.
Strukturen von Fahrzeugsitzen sollen einerseits Werkstoffe mit einer hohen gewichtsspezifischen Steifigkeit, Festigkeit und Energieabsorption aufweisen, um die Sicherheit für den Insassen zu erhöhen, und andererseits Leichtbau- Werkstoffe verwenden, um das Gesamtgewicht zu verringern. Die Herstellung von belastungs- und gewichtsoptimierten Strukturen wird durch die Kombination verschiedener Werkstoffe erreicht, d.h. es entstehen Hybridstrukturen.On the one hand, vehicle seat structures are said to have materials with high weight-specific stiffness, strength, and energy absorption to increase occupant safety, and on the other hand use lightweight materials to reduce the overall weight. The production of load and weight optimized structures is achieved by the combination of different materials, i. Hybrid structures are created.
Die beiden Werkstoffe der Hybridstruktur sind miteinander zu verbinden. Als Ver- bindungstechniken kommen beispielsweise das Kleben, Nieten, Schrauben, Clinch- Nieten und Schweißen in Frage. Das Schweißen von zwei Metallen kann ohne Druck erfolgen (Schmelzschweißen), beispielsweise beim Metall-Aktivgas-Schweißen oder beim Laserschweißen, mit welchem bei Strukturen aus Stahl annähernd ein Kosten- und Gewichtsoptimum erreicht wird, oder es kann unter Anwendung von Druck erfolgen (Pressschweißen), beispielsweise beim Rollennahtschweißen, Buckelschweißen, Punktschweißen oder - erfindungsgemäß - Ultraschallschweißen. Beim Ultraschallschweißen werden die Teile im plastischen, aber ungeschmolzenen Zustand miteinander verbunden.The two materials of the hybrid structure are to be connected with each other. Bonding techniques include, for example, gluing, riveting, screwing, clinching and welding. The welding of two metals can be done without pressure (fusion welding), for example, in metal-active gas welding or In laser welding, with which in steel structures approximately a cost and weight optimum is achieved, or it can be done using pressure (pressure welding), for example, when seam welding, projection welding, spot welding or - according to the invention - ultrasonic welding. In ultrasonic welding, the parts are joined together in a plastic, but unmelted state.
Die Vorteile von Ultraschallschweißen gegenüber anderen Schweißverfahren sind, dass keine Schweißspritzer auftreten, eine Verbindung von Aluminium/ Aluminiumle- gierungen und Stahl und/oder von (glas-)faserverstärkten Kunststoffen möglich ist, ein geringer Wärmeeintrag erfolgt und damit ein geringer Verzug auftritt, eine Mehrpunkt- schweißung möglich ist und damit geringe Prozesszeiten auftreten, keine Haltezeit für eine Aushärtung notwendig ist, verfahrensbedingt kein Schweißspalt vorhanden ist, die Prozessüberwachung einfach ist und die Geometrie der Schweißverbindung belas- tungsgerecht gestaltet werden kann.The advantages of ultrasonic welding over other welding methods are that no welding spatter occurs, aluminum / aluminum alloys and steel and / or (glass) fiber reinforced plastics are bonded together, low heat input occurs and there is little distortion, a multipoint - Welding is possible and thus small process times occur, no holding time for curing is necessary, procedurally no welding gap is present, the process monitoring is simple and the geometry of the welded joint can be designed to handle.
Dadurch, dass wenigstens zwei der Strukturteile aus unterschiedlichen Materialien bestehen und mittels Ultraschallschweißens an wenigstens einer Kontaktstelle miteinander verbunden sind, steht eine kostengünstig hergestellte Hybridstruktur von geringem Gewicht zur Verfügung, welche die notwendige Festigkeit bietet. Die Materialien können dabei Alumimum/Aluminiumlegierungen einerseits und Stahl andererseits sein. Es sind aber auch andere Materialien möglich, beispielsweise glasfaserverstärkte oder andere faserverstärkte Kunststoffe, beispielsweise in Kombination mit einem der genannten Metalle. Es können zwei oder mehr Strukturteile gleichzeitig mit- einander verbunden werden. Auch die Verbindung an mehreren Kontaktstellen gleichzeitig, beispielsweise mittels mehrerer, gegebenenfalls unterschiedlicher Sonotroden einer Ultraschweiß- Vorrichtung, ist möglich.By virtue of the fact that at least two of the structural parts are made of different materials and are joined together by means of ultrasound welding at at least one contact point, a low-cost, low-cost hybrid structure is available which provides the necessary strength. The materials may be aluminum / aluminum alloys on the one hand and steel on the other hand. However, other materials are possible, for example glass-fiber reinforced or other fiber-reinforced plastics, for example in combination with one of the metals mentioned. Two or more structural parts can be connected together at the same time. The connection at several contact points at the same time, for example by means of several, possibly different sonotrodes an ultrasonic device is possible.
Die Struktur ist vorzugsweise die tragende Struktur einer Lehne eines Fahrzeugsitzes, kann aber auch die tragende Struktur eines Sitzteils sein. Vorzugsweise werden Grundbleche und Holme miteinander verbunden. Es könnten beispielsweise auch Seitenteile und Quertraversen miteinander verbunden werden. Im folgenden ist die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels mit einer Abwandlung näher erläutert. Es zeigenThe structure is preferably the supporting structure of a backrest of a vehicle seat, but may also be the supporting structure of a seat part. Preferably, base plates and spars are connected to each other. It could, for example, side parts and crossbeams are interconnected. In the following the invention with reference to an embodiment shown in the drawing with a modification is explained in more detail. Show it
Fig. 1 eine perspektivische Ansicht des Ausführungsbeispiels,1 is a perspective view of the embodiment,
Fig. 2 eine schematische Seitenansicht eines Fahrzeugsitzes,2 is a schematic side view of a vehicle seat,
Fig. 3 einen Schnitt durch das Ausfuhrungsbeispiel entlang der Linie III-III in Fig. 1,3 shows a section through the exemplary embodiment along the line III-III in Fig. 1,
Fig. 4 einen Schnitt durch eine Abwandlung,4 shows a section through a modification,
Fig. 5 eine teilweise geschnitten und schematisierte Darstellung einer bekanntenFig. 5 is a partially sectioned and schematic representation of a known
Ultraschallschweiß- Vorrichtung,Ultrasonic welding device,
Fig. 6 eine schematische Teilansicht der Ultraschallschweiß- Vorrichtung mit gekippter Sonotrode und passenden Werkstücken,6 is a schematic partial view of the ultrasonic welding device with tilted sonotrode and matching workpieces,
Fig. 7 eine andere passende Ausbildung der Werkstücke,7 shows another suitable design of the workpieces,
Fig. 8 eine schematische Teilansicht der Ultraschallschweiß- Vorrichtung mit abwechselnd angeordneten Sonotroden,8 is a schematic partial view of the ultrasonic welding device with alternately arranged sonotrodes,
Fig. 9 eine Seitenansicht zu Fig. 8, und9 is a side view of Fig. 8, and
Fig. 10 eine perspektivische Teilansicht der Ultraschweiß- Vorrichtung mit versetzt zueinander angeordneten Sonotroden von abwechselndem Typ.10 shows a perspective partial view of the ultrasound apparatus with mutually offset sonotrodes of alternating type.
Ein Fahrzeugsitz 1 eines Kraftfahrzeuges weist ein Sitzteil 3, welches mit der Fahr- zeugstruktur S des Kraftfahrzeuges verbunden ist, und eine relativ zum Sitzteil 3 schwenkbare Lehne 6 auf, welche beidseitig am Sitzteil 3 angelenkt ist. Für den Sitzgebrauch ist die Lehne 6 mit dem Sitzteil 3 oder der Fahrzeugstruktur S verriegelt. Im Ausfuhrungsbeispiel ist der Fahrzeugsitz 1 eine Rücksitzanlage mit geteilter Rückenlehne, d.h. die Lehne 6 ist der 1/3-Teil oder 2/3-Teil der besagten geteilten Rückenlehne.A vehicle seat 1 of a motor vehicle has a seat part 3, which is connected to the vehicle structure S of the motor vehicle, and a backrest 6, which is pivotable relative to the seat part 3 and which is hinged to the seat part 3 on both sides. For seat use, the backrest 6 is locked to the seat part 3 or the vehicle structure S. in the Exemplary embodiment, the vehicle seat 1 is a rear seat with split backrest, ie the backrest 6 is the 1/3 part or 2/3 part of said split backrest.
Die Lehne 6 weist eine tragende Struktur 10 auf, welche als Strukturteile ein Grundblech 12 und wenigstens einen Holm 14 umfasst. Das Grundblech 12 ist im wesentlichen eben. Es kann zu seiner Verstärkung Sicken aufweisen. Der Holm 14 weist ein im wesentlichen U-förmiges Profil auf. Vorliegend sind mehrere Holme 14 untereinander zu einem umlaufenden Rahmen verbunden, teilweise auch einstückig miteinander aus- gebildet. Die vorhandenen Holme 14 sind auf der - beim Sitzgebrauch dem Insassen zugewandten - Vorderseite des Grundblechs 12 angeordnet und mit diesem - unter Bildung von Kastenprofilen - verbunden. Die so gebildete Struktur 10 ist auf der Vorderseite des Grundblechs 12 auch gepolstert. Die Rückseite des Grundblechs 12 ist direkt dem Laderaum zugewandt, gegebenenfalls lediglich noch lackiert oder verblendet, und kann bei vorgeschwenkter Lehne 4 den Ladeboden verlängern.The backrest 6 has a load-bearing structure 10, which as structural parts comprises a base plate 12 and at least one spar 14. The base plate 12 is substantially flat. It may have beads to reinforce it. The spar 14 has a substantially U-shaped profile. In the present case, a plurality of spars 14 are connected to one another to form a peripheral frame, in some cases also formed in one piece with one another. The existing spars 14 are arranged on the - facing the occupant in the seat - front of the base plate 12 and with this - to form box sections - connected. The structure 10 thus formed is also padded on the front side of the base plate 12. The back of the base plate 12 is directly facing the cargo space, possibly only painted or veneered, and can extend the loading floor at vorwenkter backrest 4.
Das Grundblech 12 besteht im Ausführungsbeispiel aus Aluminium, genauer gesagt vorliegend legiertem Aluminiumblech Al Mg 4,5 Mn in einer Stärke von beispielsweise 0,7 mm oder 1,0 mm. Der Holm 14 besteht im Ausführungsbeispiel aus Stahl, genauer gesagt vorliegend Stahlblech in einer Stärke von 0,7 mm. Der Holm 14 und das Grundblech 12 sind miteinander ultraschallverschweißt, d.h. mittels Ultraschallschweißens verbunden.The base plate 12 is in the embodiment of aluminum, more in the present case alloyed aluminum sheet Al Mg 4.5 Mn in a thickness of, for example, 0.7 mm or 1.0 mm. The spar 14 is in the embodiment of steel, more specifically in the present case steel sheet in a thickness of 0.7 mm. The spar 14 and the base plate 12 are ultrasonically welded together, i. connected by ultrasonic welding.
Eine an sich bekannte Ultraschallschweiß- Vorrichtung 100 weist einen Amboss 101 (Grundplatte), einen relativ zum Amboss 101 feststehenden Ständer 103 und einen relativ zum Ständer 103 beweglichen, vorliegend vertikal beweglichen, Schlitten 105 auf. Der Schlitten 105 umfasst eine Führung und Aufnahme für eine Vorschubeinheit 111, welche relativ, insbesondere parallel, zum Schlitten 105 beweglich in besagter Führung und Aufnahme des Schlittens 105 gelagert ist. Die Vorschubeinheit 111 ist so- mit relativ zum Amboss 101 beweglich. Die Vorschubeinheit 111 wird durch einen am Schlitten 105 abgestützten Pneumatikzylinder 113 beaufschlagt, dessen Kolben 115 mittels einer Kolbenstange 116 und eines Dämpfungsglieds 117 sowie einer Kraft- messdose 119 in Serie die Vorschubeinheit 111 vorliegend auf ihrer Oberseite beaufschlagt. Eine Rückholfeder 121 spannt die Vorschubeinheit 111 in Richtung auf den Pneumatikzylinder 113 vor.A per se known ultrasonic welding apparatus 100 has an anvil 101 (base plate), a relative to the anvil 101 fixed stand 103 and a relative to the stator 103 movable, in this case vertically movable slide 105. The carriage 105 comprises a guide and receptacle for a feed unit 111, which is mounted relative to the carriage 105 movable, in particular in parallel, in said guide and receiving the carriage 105. The feed unit 111 is thus movable relative to the anvil 101. The feed unit 111 is acted on by a pneumatic cylinder 113 supported on the carriage 105, the piston 115 of which is actuated by means of a piston rod 116 and an attenuator 117 and a force rod. Meßdose 119 in series present the feed unit 111 in this case acted upon on its upper side. A return spring 121 biases the feed unit 111 in the direction of the pneumatic cylinder 113.
Die Vorschubeinheit 111 umschließt einen Konverter 125, welcher einer von einem Generator 127 erzeugte Hochspannung in Ultraschall umwandelt. Der Ultraschall wird durch einen Booster 129 übertragen auf eine oder mehrere Sonotroden 131 an der Spitze der Vorschubeinheit 111, d.h. vorliegend an deren Unterseite. Die Sonotroden 131 setzen auf dem einen Werkstück auf, wobei das andere Werkstück auf dem Am- boss 101 aufliegt, d.h. die Werkstücke sind zwischen den Sonotroden 131 und dem Amboss 101 angeordnet. Der Pneumatikzylinder 113 baut einen statischen Druck auf, so dass die beiden Werkstücke in Kontaktenpunkten P unter Vorspannung aneinander anliegen, kontrolliert und gesteuert durch die Kraftmessdose 119.The feed unit 111 encloses a converter 125 which converts a high voltage generated by a generator 127 into ultrasound. The ultrasound is transmitted through a booster 129 to one or more sonotrodes 131 at the tip of the advancing unit 111, i. present at the bottom. The sonotrodes 131 set on the one workpiece, wherein the other workpiece rests on the boss 101, i. the workpieces are arranged between the sonotrodes 131 and the anvil 101. The pneumatic cylinder 113 builds up a static pressure, so that the two workpieces in contact points P biased against each other, controlled and controlled by the load cell 119th
Der über die Sonotroden 131 in das obere Werkstück eingeleitete Ultraschall erwärmt die Materialien (Stahl/Aluminium) an den unter Vorspannung stehenden Kontaktstellen P auf ca. 300° - 400° C. Bei diesem physikalischen Kontakt entsteht eine atomare Wechselwirkung zwischen den Materialien, wobei Aluminiumatome in die Stahloberfläche diffundieren.The ultrasound introduced into the upper workpiece via the sonotrodes 131 heats the materials (steel / aluminum) at the prestressed contact points P to approximately 300 ° -400 ° C. In this physical contact, an atomic interaction between the materials occurs, with aluminum atoms diffuse into the steel surface.
Mit einer solchen Ultraschallschweiß- Vorrichtung 100 wird der Holm 14 mit dem Grundblech 12 verschweißt. Die Schweißverbindung ist in ihrer Größe und Kontur so angeordnet, dass bezüglich ihrer Festigkeit die erforderliche Energieaufnahme der Struktur 10 sichergestellt ist. Zur Verkürzung der Prozesszeiten verschweißen mehrere Sonotroden 131 gleichzeitig mehrere, in einer Ebene gelegene Kontaktstellen P zwischen dem Holm 14 und dem Grundblech 12. Es ist in abgewandelter Ausführung auch möglich, zwei ineinander geschachtelte Holme 14 von unterschiedlichem Profil gleichzeitig mit dem Grundblech 12 zu verschweißen, also eine Dreifachschweißung vorzunehmen' Die Sonotroden 131 können unterschiedlich in der Dimensionierung und/oder im Aufbau (Typ) sein. Die Schweißnaht kann entsprechend der aufzunehmenden Lasten unterschiedlich dimensioniert sein, was auch durch die unterschiedlichen Sonotroden 131 erreicht werden kann. Die möglichen Grundformen der Schweißflächen an den Kontaktstellen P können insbesondere ringförmig, quadratisch oder kreisförmig sein. Je nach Anforderung können auch mehrere Vorschubeinheiten 111 und/oder mehrere Schlitten 105 vorgesehen sein.With such an ultrasonic welding device 100, the spar 14 is welded to the base plate 12. The welded joint is arranged in size and contour so that the required energy absorption of the structure 10 is ensured in terms of their strength. In order to shorten the process times, a plurality of sonotrodes 131 simultaneously weld a plurality of contact points P in a plane between the spar 14 and the base plate 12. In a modified embodiment, it is also possible to weld two nested bars 14 of different profile simultaneously with the base plate 12, Thus, to perform a triple welding ' sonotrodes 131 may be different in the dimensioning and / or in the structure (type). The weld can be dimensioned differently according to the loads to be absorbed, which can also be achieved by the different sonotrodes 131. The possible basic forms of Welding surfaces at the contact points P may in particular be annular, square or circular. Depending on the requirement, it is also possible to provide a plurality of feed units 111 and / or a plurality of carriages 105.
Je nach Ausführung der Ultraschallschweiß- Vorrichtung 100 kann der Ständer 103 beim Einlegen der Werkstücke als Begrenzung für das Grundblech 12 wirken, d.h. den maximal möglichen Abstand einer Kontaktstelle P zum Rand des Grundblechs 12 definieren. Um auch Bereiche in der Mitte des Grundblechs 12 zu erreichen, kann die So- notrode 131 gekippt werden, d.h. relativ zum Ständer 103 und zur Bewegungsrichtung des Schlittens 105. Vorzugsweise ist die gesamte Vorschubeinheit 111 relativ zur Bewegungsrichtung des Schlittens 105 gekippt. Entsprechend sind der Amboss 101 und die Werkstücke hierauf abgestimmt. Ein Bereich des Ambosses 101 ist im gleichen Winkel gekippt. Der Holm 14 weist einen entsprechend abgewinkelten Schweißflansch 14a auf, und das Grundblech 12 ist entsprechend geformt. Fig. 6 zeigt eine Teilansicht einer derart abgewandelten Ultraschallschweiß- Vorrichtung 100. Je nach Bauraumver- hältnissen kann es sinnvoll sein, die Schweißflansche 14a nicht stumpfwinklig wie in Fig. 6, sondern spitzwinklig vom Holm 14 abstehen zu lassen, wie in Fig. 7 dargestellt. Auch eine alternierende Anordnung dieser beiden Konzepte entlang einer Achse senkrecht zur Zeichenebene ist möglich.Depending on the design of the ultrasonic welding device 100, the stand 103 can act as a boundary for the base plate 12 when inserting the workpieces, i. define the maximum possible distance of a contact point P to the edge of the base plate 12. In order to also reach areas in the center of the base plate 12, the sonotrode 131 can be tilted, i. relative to the stand 103 and to the direction of movement of the carriage 105. Preferably, the entire feed unit 111 is tilted relative to the direction of movement of the carriage 105. Accordingly, the anvil 101 and the workpieces are tuned to this. A portion of the anvil 101 is tilted at the same angle. The spar 14 has a correspondingly angled welding flange 14a, and the base plate 12 is shaped accordingly. 6 shows a partial view of an ultrasound welding device 100 modified in this way. Depending on the installation space conditions, it may be expedient not to allow the welding flanges 14a to project at an acute angle from the spar 14, as shown in FIG. 7, as shown in FIG , An alternating arrangement of these two concepts along an axis perpendicular to the plane of the drawing is also possible.
Um den Punktabstand zwischen zwei Kontaktstellen P zu verringern, ist es von Vorteil, bezüglich der Ebene durch die Kontaktstellen P die zugeordneten Sonotroden 131 abwechselnd von verschiedenen Seiten zuzuführen, beispielsweise abwechselnd von oben und von unten, wie in Fig. 8 und in Seitenansicht dazu in Fig. 9 dargestellt. Der Amboss 101 weist entsprechend abwechselnd angeordnete Bereiche auf. Einige der Sonotroden 131 und Bereiche des Amboss 101 sind dann mit der Vorschubeinheit 111 verbunden, die anderen feststehend. Eine Kombination mit den gekippten Sonotroden 131 nach Fig. 6 und/oder 7 ist auch möglich.In order to reduce the dot pitch between two pads P, it is advantageous to feed the associated horns 131 alternately from different sides with respect to the plane through the pads P, for example alternately from above and from below, as in Fig. 8 and in side view thereto Fig. 9 shown. The anvil 101 has accordingly alternately arranged areas. Some of the sonotrodes 131 and portions of the anvil 101 are then connected to the feed unit 111, the others fixed. A combination with the tilted sonotrodes 131 of FIG. 6 and / or 7 is also possible.
In Fig. 10 ist dargestellt, wie mehrere Sonotroden 131 von abwechselndem Typ um 90° versetzt zueinander angeordnet sind. Dabei sind zwei Sonotroden 131 vom Typ "Tor- sional-Sonotrode" dargestellt, welche sich beim Schweißen um Ihre Längsachse dre- hen und stimseitig vorliegend zwei (beispielsweise nockenartige) Wirkflächen 131a aufweisen. Diese beiden Sonotroden 131 stehen mit Längsachse senkrecht zur Ebene des Grundblechs 12. Ferner sind drei Sonotroden 131 vom Typ "Linear-Lambda-Sono- trode" dargestellt, welche sich beim Schweißen senkrecht zu Ihrer Längsachse linear verschieben und radial vorliegend vier (beispielsweise nockenartige) Wirkflächen 131a aufweisen, von denen allerdings nur zwei gleichzeitig in Benutzung sind (die anderen beiden Wirkflächen dienen als Ersatz für Verschleiß). Diese drei Sonotroden 131 sind (mit Portalabstützung) in einer Ebene parallel zum Grundblech 12 angeordnet und bewegen sich innerhalb dieser Ebene senkrecht zu ihrer Längsachse. Entlang des Holmes 14 betrachtet ist eine der drei Sonotroden 131 vom Typ "Linear-Lambda-Sonotrode" zwischen den beiden Sonotroden 131 vom Typ "Torsional-Sonotrode" angeordnet, und diese Dreier-Gruppe ist zwischen den beiden anderen Sonotroden 131 vom Typ "Linear-Lambda-Sonotrode" angeordnet. Die Bewegungsrichtungen der Sonotroden 131 sind durch Pfeile in der Fig. 10 angedeutet. Durch die fünf Sonotroden 131 mit den je zwei in Benutzung befindlichen Wirkflächen 131a können zehn Schweißpunkte gleichzeitig (und mit geringem Abstand) erzeugt werden. Vorzugsweise sind die Abstände zwischen den fünf Sonotroden 131 gleich, so dass fünf gleich beabstandete Paare von je zwei Schweißpunkten an den zehn Kontaktstellen P entstehen. In Fig. 10 it is shown how a plurality of sonotrodes 131 of alternating type are arranged offset by 90 ° to each other. Two sonotrodes 131 of the "toroidal sonotrode" type are shown, which rotate about their longitudinal axis during welding. hen hen and end side present two (for example, cam-like) effective surfaces 131 a. These two sonotrodes 131 are perpendicular to the plane of the base plate 12 with longitudinal axis. Furthermore, three sonotrodes 131 of the "linear lambda sonotrode" type are shown, which move linearly during welding perpendicular to their longitudinal axis and radially four (for example, cam-like) Have effective surfaces 131 a, of which, however, only two are in use at the same time (the other two active surfaces serve as a substitute for wear). These three sonotrodes 131 are arranged (with portal support) in a plane parallel to the base plate 12 and move within this plane perpendicular to its longitudinal axis. Viewed along the spar 14, one of the three sonic probes 131 of the "linear lambda sonotrode" type is arranged between the two sonotrodes 131 of the "torsional sonotrode" type, and this triple group is located between the two other sonotrodes 131 of the "linear" type Lambda sonotrode "arranged. The directions of movement of the sonotrodes 131 are indicated by arrows in FIG. By means of the five sonotrodes 131 with the two active surfaces 131a in use, ten spot welds can be generated simultaneously (and at a small distance). Preferably, the distances between the five sonotrodes 131 are the same, so that five equally spaced pairs of two spot welds at the ten contact points P arise.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Fahrzeugsitz1 vehicle seat
3 Sitzteil3 seat part
6 Lehne6 backrest
10 Struktur10 structure
12 Grundblech12 base plate
14 Holm14 spar
14a Schweißflansch14a welding flange
100 Ultraschweißvorrichtung100 ultrasound device
101 Amboss101 anvil
103 Ständer103 stands
105 Schlitten105 sleds
111 Vorschubeinheit111 feed unit
113 Pneumatikzylinder113 pneumatic cylinders
115 Kolben115 pistons
116 Kolbenstange116 piston rod
117 Dämpfungsglied117 attenuator
119 Kraftmessdose119 load cell
121 Rückholfeder121 return spring
125 Konverter125 converters
127 Generator127 generator
129 Booster129 boosters
131 Sonotrode131 sonotrode
131a Wirkfläche131a effective area
P KontaktstelleP contact point
S Fahrzeugstruktur S vehicle structure

Claims

Patentansprüche claims
1. Struktur (10) eines Fahrzeugsitzes (1), mit wenigstens zwei Strukturteilen (12, 14), die miteinander verbunden sind, dadurch gekennzeichnet, dass wenigstens zwei der Strukturteile (12, 14) mittels Ultraschallschweißen an wenigstens einer Kontaktstelle (P) miteinander verbunden sind.A structure (10) of a vehicle seat (1) comprising at least two structural members (12, 14) joined together, characterized in that at least two of the structural members (12, 14) are ultrasonically welded to each other at least one contact pad (P) are connected.
2 Struktur nach Anspruch 1, dadurch gekennzeichnet, dass wenigstens zwei der Strukturteile (12, 14) aus unterschiedlichen Materialien bestehen.2. Structure according to claim 1, characterized in that at least two of the structural parts (12, 14) consist of different materials.
3. Struktur nach Anspruch 2, dadurch gekennzeichnet, dass wenigstens eines der Strukturteile (12) aus Aluminium/Aluminiumlegierung und wenigstens ein anderes der Strukturteile (14) aus Stahl besteht oder dass wenigstens eines der Strukturteile (12) aus einem faserverstärkten Kunststoff und wenigstens ein anderes der Strukturteile (14) aus Aluminium/Aluminiumlegierung oder Stahl besteht3. Structure according to claim 2, characterized in that at least one of the structural parts (12) of aluminum / aluminum alloy and at least one other of the structural parts (14) consists of steel or that at least one of the structural parts (12) made of a fiber-reinforced plastic and at least one other of the structural members (14) is made of aluminum / aluminum alloy or steel
4. Struktur nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass ein Struktuiteil (12) aus Aluminium/Aluminiumlegierung und zwei Strukturteile (14) aus Stahl mittels einer Dreifachschweißung an einer Kontaktstelle (P) miteinander verbunden sind.4. Structure according to claim 2 or 3, characterized in that a structural part (12) made of aluminum / aluminum alloy and two structural parts (14) made of steel by means of a triple welding at a contact point (P) are interconnected.
5. Struktur nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Struktur (10) die tragende Struktur einer Lehne (6) eines Fahrzeugsitzes5. Structure according to one of the preceding claims, characterized in that the structure (10), the supporting structure of a backrest (6) of a vehicle seat
(1) ist.(1).
6. Struktur nach Anspruch 5, dadurch gekennzeichnet, dass eines der Strukturteile (12) ein Grundblech und wenigstens ein anderes der Strukturteile (14) ein Holm ist. 6. Structure according to claim 5, characterized in that one of the structural parts (12) is a base plate and at least one other of the structural parts (14) is a spar.
7. Struktur nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Strukturteile (12, 14) an mehreren Kontaktstellen (P) miteinander verbunden sind, welche insbesondere in einer Ebene liegen.7. Structure according to one of the preceding claims, characterized in that the structural parts (12, 14) at a plurality of contact points (P) are interconnected, which lie in particular in a plane.
8. Fahrzeugsitz, insbesondere Kraftfahrzeugsitz, mit einer Struktur (10) nach einem der vorhergehenden Ansprüche.8. Vehicle seat, in particular motor vehicle seat, with a structure (10) according to one of the preceding claims.
9. Verfahren zum Verbinden wenigstens zweier Strukturteile (12, 14) einer tragenden Struktur (10), insbesondere nach einem Ansprüche 1 bis 6, dadurch ge- kennzeichnet, dass die beiden Strukturteile (12, 14) an wenigstens einer Kontaktstelle (P) mittels Ultraschallschweißen miteinander verbunden werden.9. A method for connecting at least two structural parts (12, 14) of a supporting structure (10), in particular according to one claims 1 to 6, character- ized in that the two structural parts (12, 14) at least one contact point (P) by means of Ultrasonic welding are joined together.
10. Ultraschallschweiß- Vorrichtung (100), mit einem Amboss (101) und einer relativ zum Amboss (101) beweglichen Vorschubeinheit (111), welcher mit einer kon- trollierten Vorspannung beaufschlagbar ist und wenigstens eine Sonotrode (131) trägt, wobei die zu verschweißenden Werkstücke zwischen Amboss (101) und Sonotrode (131) angeordnet sind, dadurch gekennzeichnet, dass die Ultraschallschweiß-Vorrichtung (100) wenigstens zwei Strukturteile (12, 14) einer tragenden Struktur (10) eines Fahrzeugsitzes (1), insbesondere einer Struktur (10) nach einem der Ansprüche 1 bis 7, an wenigstens einer Kontaktstelle (P) mittels Ultraschallschweißen miteinander verbindet.10. Ultraschallschweiß- device (100), with an anvil (101) and a relative to the anvil (101) movable feed unit (111), which is acted upon by a controlled bias voltage and at least one sonotrode (131) carries, wherein the welding workpieces between anvil (101) and sonotrode (131) are arranged, characterized in that the ultrasonic welding device (100) at least two structural parts (12, 14) of a supporting structure (10) of a vehicle seat (1), in particular a structure ( 10) according to one of claims 1 to 7, at least one contact point (P) by means of ultrasonic welding together.
11. Ultraschallschweiß- Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass mehrere Sonotroden (131) vorgesehen sind, um die Strukturteile (12, 14) an mehreren Kontaktstellen (P) gleichzeitig miteinander zu verbinden.11. Ultraschallschweiß- device according to claim 10, characterized in that a plurality of sonotrodes (131) are provided in order to simultaneously connect the structural parts (12, 14) at a plurality of contact points (P).
12. Ultraschallschweiß- Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, dass bezüglich einer Ebene durch wenigstens zwei Kontaktstellen (P) wenigstens zwei Sonotroden (131) abwechselnd auf verschiedenen Seiten angeordnet sind.12. Ultraschallschweiß- device according to claim 11, characterized in that with respect to a plane through at least two contact points (P) at least two sonotrodes (131) are arranged alternately on different sides.
13. Ultraschallschweiß- Vorrichtung nach einem der Ansprüche 10 bis 12, dadurch gekennzeichnet, dass wenigstens eine der Sonotroden (131) und/oder die Vor- schubeinheit (111) relativ zu einem Ständer (103) und/oder der Bewegungsrichtung eines relativ zum Ständer (103) beweglichen Schlittens (105) gekippt ist.13. ultrasonic welding device according to one of claims 10 to 12, characterized in that at least one of the sonotrodes (131) and / or Vor- thrust unit (111) relative to a stand (103) and / or the direction of movement of a relative to the stator (103) movable carriage (105) is tilted.
14. Ultraschallschweiß- Vorrichtung nach einem der Ansprüche 10 bis 13, dadurch gekennzeichnet, dass mehrere Sonotroden (131) von abwechselndem Typ um 90° versetzt zueinander angeordnet sind.14. Ultraschallschweiß- device according to one of claims 10 to 13, characterized in that a plurality of sonotrodes (131) of alternating type are arranged offset by 90 ° to each other.
15. Ultraschallschweiß- Vorrichtung nach Ansprach 14, dadurch gekennzeichnet, dass Sonotroden (131) vom Typ "Torsional-Sonotrode" und Sonotroden (131) vom Typ "Linear-Lambda-Sonotrode" abwechselnd angeordnet sind. 15. Ultraschallschweiß- device according to spoke 14, characterized in that sonotrodes (131) of the type "Torsional Sonotrode" and sonotrodes (131) of the type "linear lambda sonotrode" are arranged alternately.
EP07801137A 2006-07-18 2007-07-06 Vehicle seat structure Withdrawn EP2040874A2 (en)

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DE102006033156A DE102006033156A1 (en) 2006-07-18 2006-07-18 Structure of a vehicle seat
PCT/DE2007/001228 WO2008009268A2 (en) 2006-07-18 2007-07-06 Vehicle seat structure

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DE102006033156A1 (en) 2008-01-24
DE112007002193A5 (en) 2009-06-18
DE202007009701U1 (en) 2007-09-27

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