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EP1660343A1 - Adjuster for a vehicle seat - Google Patents

Adjuster for a vehicle seat

Info

Publication number
EP1660343A1
EP1660343A1 EP04764500A EP04764500A EP1660343A1 EP 1660343 A1 EP1660343 A1 EP 1660343A1 EP 04764500 A EP04764500 A EP 04764500A EP 04764500 A EP04764500 A EP 04764500A EP 1660343 A1 EP1660343 A1 EP 1660343A1
Authority
EP
European Patent Office
Prior art keywords
gear
adjuster
vehicle seat
fitting
adjuster according
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Withdrawn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
EP04764500A
Other languages
German (de)
French (fr)
Inventor
Rolf Schüler
Ulrich Lehmann
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 EP1660343A1 publication Critical patent/EP1660343A1/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Withdrawn legal-status Critical Current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
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/22—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable
    • B60N2/2213—Gear wheel driven mechanism
    • 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
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/0224—Non-manual adjustments, e.g. with electrical operation
    • B60N2/02246—Electric motors therefor
    • 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
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/0224—Non-manual adjustments, e.g. with electrical operation
    • B60N2/02246—Electric motors therefor
    • B60N2/02253—Electric motors therefor characterised by the transmission between the electric motor and the seat or seat parts
    • 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
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
    • B60N2/1605—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable characterised by the cinematic
    • B60N2/161—Rods
    • B60N2/1615—Parallelogram-like structure
    • 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
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
    • B60N2/1635—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable characterised by the drive mechanism
    • B60N2/165—Gear wheel driven mechanism
    • 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
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
    • B60N2/1635—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable characterised by the drive mechanism
    • B60N2/1655—Cycloidal or planetary mechanism
    • 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
    • B60N2/90—Details or parts not otherwise provided for
    • B60N2/919—Positioning and locking mechanisms
    • B60N2/933—Positioning and locking mechanisms rotatable
    • B60N2/943—Stepwise movement mechanisms, e.g. ratchets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/1987—Rotary bodies
    • Y10T74/19884—Irregular teeth and bodies

Definitions

  • the invention relates to an adjuster for a vehicle seat with the features of the preamble of claim 1.
  • An adjuster of this type is provided as a height adjuster in a vehicle seat, the height being adjusted by a movement of rockers.
  • the assigned gear fitting is based on an eccentric principle, which is why, in combination with the rockers, the torque requirement of the overall system fluctuates periodically with the eccentric rotation.
  • a high-torque, heavy-duty motor is conventionally selected, the speed of which is only slightly influenced.
  • the invention is based on the object of improving an adjuster of the type mentioned. This object is achieved by an adjuster with the features of claim 1. Advantageous refinements are the subject of the dependent claims.
  • the fluctuating torque requirement of the system can be at least almost compensated for from the gear fitting designed as an eccentric gear and possibly lever and oscillation of the adjuster, ie the drive of the gear stage can be uniform, in particular at a uniform speed, respectively.
  • a motor drive a motor that is weaker in comparison to the prior art can then be used and is less expensive and less expensive. Noticeable and annoying fluctuations in force are avoided with stepping gears. Overall, comfort is increased by the solution according to the invention.
  • the gear stage is preferably designed as a non-circular gear, i.e. at least one gearwheel, usually two gearwheels for geometric reasons, rotates or rotates around a pivot point deviating from the center of curvature of their toothing.
  • the gears provided are designed for several full rotations, which is made possible, for example, by an at least approximate circular shape, for example at the tip circle. From DE 26 26442 C2 a height adjuster is known which has two elliptical tooth segments, but due to the low transmission ratio with only partial revolutions of the tooth segments very high operating forces have to be exerted which can only be sensibly controlled, in particular, only by using the gear fitting provided according to the invention in the case of a motor drive.
  • the corresponding points or areas of the individual teeth do not usually lie exactly on a common circle in special gearwheels, and only in special cases. Rather, the shape of the connecting line is determined from the distances to the gear pivot point belonging to the respective angle, the size of which in turn is derived from the translation desired at the respective angle.
  • These gears are directly or indirectly supported in their pivot point, which is offset from the center of gravity of the surface, for example by sitting in a rotationally fixed manner on a mounted shaft which then defines the respective axis of rotation.
  • a shaft stub is sufficient to save installation space, although longer waves are also possible.
  • These gears have a pitch circle with a sinusoidal shape, which is adapted to the fluctuations in torque.
  • the single tooth geometry changes continuously with the circumference, in particular the values for profile shift, foot and head height, transition radii change etc.
  • One gear is preferably driven by the motor, while the other gear preferably drives the gear fitting.
  • the gear ratio changes periodically around the mean 1: 1.
  • the gear stage preferably has an almost closed housing, within which the gear wheels are arranged and securely mounted.
  • the gear stage can be integrated in the motor, for example with its gearbox, which is usually present, can be arranged in the same housing.
  • each vehicle seat can be equipped with an adjuster according to the invention, which then ultimately moves a component or entire assembly of the vehicle seat when actuated.
  • Fig. 3 is a perspective view of part of the embodiment from the direction opposite to Fig. 1, and
  • a vehicle seat 1 for a motor vehicle has an adjuster 3 designed as a height adjuster, by means of which the seat cushion 5 together with the backrest 7 can be adjusted in height relative to the vehicle floor of the motor vehicle.
  • an adjuster 3 designed as a height adjuster, by means of which the seat cushion 5 together with the backrest 7 can be adjusted in height relative to the vehicle floor of the motor vehicle.
  • Swing arm 13 and a rear swing arm 15 are hinged, which are each hinged at their other end to a seat frame side part 17, so that a four-bar linkage is defined.
  • a motor 19 attached to the seat frame side part 17 drives, by means of a gear stage 21, which is described in more detail below, a gear fitting 25, which is incorporated in the seat frame side part 17 and which is by means of a drive lever 27 on an arm 29 of the rear rocker arm 15, which is a component of the adjuster 3 and at the same time of the vehicle seat 1 forms, engages and pivots, whereby the adjuster 3 is actuated.
  • the self-locking gear fitting 25 which is known per se, has in its interior a rotating eccentric, which ensures a rolling motion between a spur gear and an internal ring gear, which are each provided on different fitting parts. A full rotation of the eccentric causes the fittings to turn by a few degrees. Due to the rotation of the eccentric, the lever arms and support points change relative to the drive lever 27 within the gear fitting 25, so that a fluctuating torque requirement arises.
  • the gear stage 21 provided between the motor 19 and the gear fitting 21 comprises a first housing part 31 to be attached to the seat frame side part 17 and a second housing part 33 to be connected to the latter to form an almost closed housing, between which a first gear 35 and a second Gear 37 are arranged.
  • the first gear 35 and the second gear 37 are rotatably supported in the two housing parts 31 and 33 by means of bearing bushes 39.
  • a profiled drive shaft stub driven by the motor 19 and defining a first axis of rotation 41 projects through the second housing part 33 and rotatably receives the first gear 35.
  • the first gear 35 meshes the second gear 37, which is non-rotatably seated on a profiled output shaft stub, which defines a second axis of rotation 43, projects through the first housing part 31 and drives the gear fitting 25.
  • the first axis of rotation 41 and the second axis of rotation 43 penetrate the first gear 35 and the second gear 37 at points which, in contrast to conventional gearwheels, do not lie in the center of a circle and thus do not lie in the center of gravity of the tooth geometry, i.e. the gears are out of round in terms of their fulcrum. While the first axis of rotation 41, about which the first gear 35 rotates, and the second axis of rotation 43, about which the second gear 37 rotates, the distance between the contact point of the two gears 35 and 37 changes continuously during one revolution, which results in an equally continuous change in the gear ratio. Each individual tooth of the two gear wheels 35 and 37 is in its geometry, i.e.
  • the gear stage 21 thus forms a non-circular gear.
  • the fluctuating transmission ratio of the gear stage 21 can compensate for the fluctuating torque requirement of the system consisting of gear fitting 25, drive lever 29 and rear rocker 15 in such a way that the motor 19, which is designed as a simple DC motor, can deliver an almost constant torque, i.e. no significant fluctuations in the motor speed occur, which occur would cause annoying noises.
  • Bearing bush first axis of rotation second axis of rotation

Landscapes

  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Seats For Vehicles (AREA)

Abstract

The invention relates to an adjuster (3) for a vehicle seat, particularly for a motor vehicle seat, comprising a gearing fitting that can be driven, whereby said gearing fitting moves a component of the adjuster (3) and/or of the vehicle seat (1). A gear train (21) having a variable transmission ratio is mounted before the gearing fitting.

Description

Einsteller für einen Fahrzeugsitz Adjuster for a vehicle seat

Die Erfindung betrifft einen Einsteller für einen Fahrzeugsitz mit den Merkmalen des Oberbegriffs des Anspruches 1.The invention relates to an adjuster for a vehicle seat with the features of the preamble of claim 1.

Ein Einsteller dieser Art ist bei einem Fahrzeugsitz als Höheneinsteller vorgesehen, wobei die Höhe durch eine Bewegung von Schwingen eingestellt wird. Der zugeordnete Getriebebeschlag basiert auf einem Exzenterprinzip, weshalb in Kombinati- on mit den Schwingen der Momentenbedarf des Gesamtsystems mit der Exzenterrotation periodisch schwankt. Um entsprechende Schwankungen der Motordrehzahl, die zu störenden Geräuschen führen, zu verhindern, wird herkömmlicherweise ein drehmomentenstarker, hochbelastbarer Motor gewählt, dessen Drehzahl nur unmerklich beeinflußt wird.An adjuster of this type is provided as a height adjuster in a vehicle seat, the height being adjusted by a movement of rockers. The assigned gear fitting is based on an eccentric principle, which is why, in combination with the rockers, the torque requirement of the overall system fluctuates periodically with the eccentric rotation. In order to prevent corresponding fluctuations in the engine speed, which lead to disturbing noises, a high-torque, heavy-duty motor is conventionally selected, the speed of which is only slightly influenced.

Der Erfindung liegt die Aufgabe zu Grunde, einen Einsteller der eingangs genannten Art zu verbessern. Diese Aufgabe wird erfindungsgemäß durch einen Einsteller mit den Merkmalen des Anspruches 1 gelöst. Vorteilhafte Ausgestaltungen sind Gegenstand der Unteransprüche.The invention is based on the object of improving an adjuster of the type mentioned. This object is achieved by an adjuster with the features of claim 1. Advantageous refinements are the subject of the dependent claims.

Dadurch, daß dem Getriebebeschlag eine Getriebestufe mit schwankendem Übersetzungsverhältnis vorgeschaltet ist, kann der schwankende Momentenbedarf des Systems aus dem als Exzentergetriebe ausgebildeten Getriebebeschlag und gegebenenfalls Hebeln und Schwingen des Einstellers wenigstens nahezu ausgeglichen werden, d.h. der Antrieb der Getriebestufe kann gleichmäßig, insbesondere mit gleichmäßiger Drehzahl, erfolgen. Bei einem bevorzugten motorischen Antrieb kann dann ein im Vergleich zum Stand der Technik schwächerer Motor verwendet werden, der kosten- und gewichtsgünstiger ist. Bei Schrittschaltwerken werden spürbare und störende Kraftschwankungen vermieden. Insgesamt wird durch die erfindungsgemäße Lösung der Komfort gesteigert.Due to the fact that a gear stage with a fluctuating gear ratio is connected upstream of the gear fitting, the fluctuating torque requirement of the system can be at least almost compensated for from the gear fitting designed as an eccentric gear and possibly lever and oscillation of the adjuster, ie the drive of the gear stage can be uniform, in particular at a uniform speed, respectively. With a preferred motor drive a motor that is weaker in comparison to the prior art can then be used and is less expensive and less expensive. Noticeable and annoying fluctuations in force are avoided with stepping gears. Overall, comfort is increased by the solution according to the invention.

Die Getriebestufe ist vorzugsweise als Unrundgetriebe ausgebildet, d.h. wenigstens ein Zahnrad, aus geometrischen Gründen in der Regel zwei Zahnräder, rotiert bzw. rotieren jeweils um einen vom Krümmungsmittelpunkt ihrer Verzahnung abweichenden Drehpunkt. Die vorgesehenen Zahnräder sind für mehrere volle Umdre- hungen ausgelegt, was beispielsweise durch eine zumindest näherungs weise vorhandene Kreisform, beispielsweise am Kopfkreis, ermöglicht wird. Aus der DE 26 26442 C2 ist zwar ein Höheneinsteller bekannt, der zwei elliptische Zahnsegmente aufweist, jedoch sind aufgrund des geringen Übersetzungsverhältnisses mit nur teilweisen Umdrehungen der Zahnsegmente sehr hohe Bedienkräfte aufzubringen, die sinnvoll erst durch die Verwendung des erfindungs gemäß vorgesehenen Getriebebeschlags beherrschbar sind, insbesondere im Falle eines motorischen Antriebs.The gear stage is preferably designed as a non-circular gear, i.e. at least one gearwheel, usually two gearwheels for geometric reasons, rotates or rotates around a pivot point deviating from the center of curvature of their toothing. The gears provided are designed for several full rotations, which is made possible, for example, by an at least approximate circular shape, for example at the tip circle. From DE 26 26442 C2 a height adjuster is known which has two elliptical tooth segments, but due to the low transmission ratio with only partial revolutions of the tooth segments very high operating forces have to be exerted which can only be sensibly controlled, in particular, only by using the gear fitting provided according to the invention in the case of a motor drive.

Bei den in der Getriebestufe vorgesehenen Zahnrädern liegen im Gegensatz zu üblichen Getriebezahnrädern die einander entsprechenden Punkte oder Bereiche der ein- zelnen Zähne, beispielsweise die Zahnkopfmitten, in der Regel nicht exakt und nur in Sonderfällen auf einem gemeinsamen Kreis. Vielmehr bestimmt sich die Form der Verbindungslinie aus den zum jeweiligen Winkel gehörenden Abständen zum Zahnraddrehpunkt, deren Größe wiederum sich aus der beim jeweiligen Winkel gewünschten Übersetzung ableitet. Diese Zahnräder sind in ihrem zum Flächen- Schwerpunkt versetzten Drehpunkt direkt oder indirekt gelagert, indem sie beispielsweise drehfest jeweils auf einer gelagerten Welle sitzen, welche dann die jeweilige Drehachse definiert. Zur Einsparung von Bauraum genügt ein Wellenstummel, wobei auch längere Wellen möglich sind. Diese Zahnräder weisen einen Wälzkreis mit sinusartigem Verlauf auf, der an die Momentenschwankungen angepaßt ist. Die Einzelzahngeometrie ändert sich kontinuierlich mit dem Umfang, insbesondere ändern sich die Werte für Profilverschiebung, Fuß- und Kopfhöhe, Übergangsradien etc. Ein Zahnrad wird vorzugsweise vom Motor angetrieben, während das andere Zahnrad vorzugsweise den Getriebebeschlag antreibt. Das Übersetzungsverhältnis ändert sich periodisch um den Mittelwert 1:1 herum.In contrast to conventional gearwheels, the corresponding points or areas of the individual teeth, for example the center of the toothhead, do not usually lie exactly on a common circle in special gearwheels, and only in special cases. Rather, the shape of the connecting line is determined from the distances to the gear pivot point belonging to the respective angle, the size of which in turn is derived from the translation desired at the respective angle. These gears are directly or indirectly supported in their pivot point, which is offset from the center of gravity of the surface, for example by sitting in a rotationally fixed manner on a mounted shaft which then defines the respective axis of rotation. A shaft stub is sufficient to save installation space, although longer waves are also possible. These gears have a pitch circle with a sinusoidal shape, which is adapted to the fluctuations in torque. The single tooth geometry changes continuously with the circumference, in particular the values for profile shift, foot and head height, transition radii change etc. One gear is preferably driven by the motor, while the other gear preferably drives the gear fitting. The gear ratio changes periodically around the mean 1: 1.

Für eine Vormontage, die insbesondere wegen der mehrdeutigen, nur in einer Stellung funktionsfähigen Ausrichtung hilfreich ist, weist die Getriebestufe vorzugsweise ein nahezu geschlossenes Gehäuse aufweist, innerhalb dessen die Zahnräder angeordnet und sicher gelagert sind. Die Getriebestufe kann in den Motor integriert sein, beispielsweise mit dessen in der Regel vorhandenen Getriebe im gleichen Ge- häuse angeordnet sein.For a pre-assembly, which is particularly helpful because of the ambiguous orientation that can only function in one position, the gear stage preferably has an almost closed housing, within which the gear wheels are arranged and securely mounted. The gear stage can be integrated in the motor, for example with its gearbox, which is usually present, can be arranged in the same housing.

Ein Einsatz des erfindungsgemäßen Einstellers ist insbesondere für Höheneinsteller oder Neigungseinsteller sinnvoll, bei denen das Sitzkissen bewegt wird, da hierzu hohe Kräfte notwendig sind. Es ist aber auch möglich, den Einsteller als Neigungs- einsteller für die Lehne vorzusehen. Entsprechend kann prinzipiell jeder Fahrzeugsitz mit einem erfindungsgemäßen Einsteller ausgerüstet werden, der dann bei Betätigung letztendlich eine Komponente oder ganze Baugruppe des Fahrzeugsitzes bewegt.Use of the adjuster according to the invention is particularly useful for height adjusters or inclination adjusters in which the seat cushion is moved, since this requires high forces. However, it is also possible to provide the adjuster as an incline adjuster for the backrest. Accordingly, in principle, each vehicle seat can be equipped with an adjuster according to the invention, which then ultimately moves a component or entire assembly of the vehicle seat when actuated.

Im folgenden ist die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. Es zeigenThe invention is explained in more detail below with reference to an embodiment shown in the drawing. Show it

Fig. 1 eine perspektivische Explosionsdarstellung eines Teils des Ausführungsbeispiels,1 is an exploded perspective view of part of the embodiment,

Fig. 2 eine Ansicht der beiden Zahnräder,2 is a view of the two gears,

Fig. 3 eine perspektivische Ansicht eines Teils des Ausführungsbeispiels aus der zu Fig. 1 entgegengesetzten Blickrichtung, undFig. 3 is a perspective view of part of the embodiment from the direction opposite to Fig. 1, and

Fig. 4 eine schematische Ansicht eines Fahrzeugsitzes, Ein Fahrzeugsitz 1 für ein Kraftfahrzeug weist einen als Höheneinsteller ausgebildeten Einsteller 3 auf, mittels dessen das Sitzkissen 5 samt Lehne 7 in der Höhe relativ zum Fahrzeugboden des Kraftfahrzeuges einstellbar ist. Hierfür sind auf beiden Fahrzeugsitzseiten an Sitzschienen 11 mit jeweils einem Ende eine vordere4 shows a schematic view of a vehicle seat, A vehicle seat 1 for a motor vehicle has an adjuster 3 designed as a height adjuster, by means of which the seat cushion 5 together with the backrest 7 can be adjusted in height relative to the vehicle floor of the motor vehicle. For this purpose, there is a front one on both sides of the vehicle seat rails 11 with one end each

Schwinge 13 und eine hintere Schwinge 15 angelenkt, welche mit ihrem anderen Ende jeweils an einem Sitzrahmen-Seitenteil 17 angelenkt sind, so daß ein Viergelenk definiert ist. Ein am Sitzrahmen-Seitenteil 17 angebrachter Motor 19 treibt mittels einer nachfolgend näher beschriebenen Getriebestufe 21 einen im Sitzrahmen- Seitenteil 17 eingebrachten Getriebebeschlag 25 an, welcher mittels eines Antriebshebels 27 an einem Arm 29 der hinteren Schwinge 15, die eine Komponente des Einstellers 3 und zugleich des Fahrzeugsitzes 1 bildet, angreift und diese schwenkt, wodurch der Einsteller 3 betätigt wird.Swing arm 13 and a rear swing arm 15 are hinged, which are each hinged at their other end to a seat frame side part 17, so that a four-bar linkage is defined. A motor 19 attached to the seat frame side part 17 drives, by means of a gear stage 21, which is described in more detail below, a gear fitting 25, which is incorporated in the seat frame side part 17 and which is by means of a drive lever 27 on an arm 29 of the rear rocker arm 15, which is a component of the adjuster 3 and at the same time of the vehicle seat 1 forms, engages and pivots, whereby the adjuster 3 is actuated.

Der an sich bekannte, selbsthemmende Getriebebeschlag 25 weist in seinem Inneren einen sich drehenden Exzenter auf, welcher für eine Abwälzbewegung zwischen einem Stirnzahnrad und einem Innenzahnkranz sorgt, die jeweils an verschiedenen Beschlagteilen vorgesehen sind. Eine volle Drehung des Exzenters bewirkt eine Verdrehung der Beschlagteile um einige Winkelgrade. Aufgrund der Drehung des Exzenters ändern sich innerhalb des Getriebebeschlags 25 die Hebelarme und Ab- stützpunkte relativ zum Antriebshebel 27, so daß ein schwankender Momentenbedarf entsteht.The self-locking gear fitting 25, which is known per se, has in its interior a rotating eccentric, which ensures a rolling motion between a spur gear and an internal ring gear, which are each provided on different fitting parts. A full rotation of the eccentric causes the fittings to turn by a few degrees. Due to the rotation of the eccentric, the lever arms and support points change relative to the drive lever 27 within the gear fitting 25, so that a fluctuating torque requirement arises.

Die zwischen dem Motor 19 und dem Getriebebeschlag 21 vorgesehene Getriebe- stufe 21 umfasst ein am Sitzrahmen-Seitenteil 17 anzubringendes erstes Gehäuseteil 31 und ein mit letzterem zur Bildung eines nahezu geschlossenen Gehäuses zu verbindenden zweiten Gehäuseteil 33, zwischen denen ein erstes Zahnrad 35 und ein zweites Zahnrad 37 angeordnet sind. Das erste Zahnrad 35 und das zweite Zahnrad 37 sind mittels Lagerbuchsen 39 in den beiden Gehäuseteilen 31 und 33 drehbar ge- lagert. Ein vom Motor 19 angetriebener, profilierter Antriebswellenstummel, der eine erste Drehachse 41 definiert, ragt durch das zweite Gehäuseteil 33 hindurch und nimmt das erste Zahnrad 35 drehfest auf. Das erste Zahnrad 35 kämmt das zweite Zahnrad 37, welches drehfest auf einem profilierten Abtriebswellenstummel sitzt, der eine zweite Drehachse 43 definiert, durch das erste Gehäuseteil 31 hindurch ragt und den Getriebebeschlag 25 antreibt.The gear stage 21 provided between the motor 19 and the gear fitting 21 comprises a first housing part 31 to be attached to the seat frame side part 17 and a second housing part 33 to be connected to the latter to form an almost closed housing, between which a first gear 35 and a second Gear 37 are arranged. The first gear 35 and the second gear 37 are rotatably supported in the two housing parts 31 and 33 by means of bearing bushes 39. A profiled drive shaft stub driven by the motor 19 and defining a first axis of rotation 41 projects through the second housing part 33 and rotatably receives the first gear 35. The first gear 35 meshes the second gear 37, which is non-rotatably seated on a profiled output shaft stub, which defines a second axis of rotation 43, projects through the first housing part 31 and drives the gear fitting 25.

Die erste Drehachse 41 und die zweite Drehachse 43 durchdringen das erste Zahnrad 35 bzw. das zweite Zahnrad 37 an Stellen, die im Gegensatz zu üblichen Getriebezahnrädern nicht im Mittelpunkt eines Kreises und damit nicht im Flächenschwerpunkt der Verzahnungsgeometrie liegen, d.h. bezüglich ihres Drehpunktes sind die Zahnräder unrund. Während die erste Drehachse 41, um welche sich das erste Zahnrad 35 dreht, und die zweite Drehachse 43, um welche sich das zweite Zahnrad 37 dreht, ortsfest bleiben, ändert sich der Abstand des Kontaktpunktes der beiden Zahnräder 35 und 37 kontinuierlich während einer Umdrehung, wodurch sich eine ebenso kontinuierliche Änderung des Übersetzungsverhältnisses ergibt. Je- der einzelne Zahn der beiden Zahnräder 35 und 37 ist in seiner Geometrie, d.h.The first axis of rotation 41 and the second axis of rotation 43 penetrate the first gear 35 and the second gear 37 at points which, in contrast to conventional gearwheels, do not lie in the center of a circle and thus do not lie in the center of gravity of the tooth geometry, i.e. the gears are out of round in terms of their fulcrum. While the first axis of rotation 41, about which the first gear 35 rotates, and the second axis of rotation 43, about which the second gear 37 rotates, the distance between the contact point of the two gears 35 and 37 changes continuously during one revolution, which results in an equally continuous change in the gear ratio. Each individual tooth of the two gear wheels 35 and 37 is in its geometry, i.e.

Höhe, Breite, Neigung, Flanken winkel, Radien etc., individuell so angepaßt, daß die beiden Zahnräder 35 und 37 trotz des Versatzes gleichmäßig aneinander ablaufen. Die Getriebestufe 21 bildet somit ein Unrundgetriebe.Height, width, inclination, flank angle, radii etc., individually adjusted so that the two gears 35 and 37 run evenly against each other despite the offset. The gear stage 21 thus forms a non-circular gear.

Im Betrieb sind etliche Umdrehungen der Zahnräder 35 und 37 der Getriebestufe 21 vorgesehen. Das schwankende Übersetzungsverhältnis der Getriebestufe 21 kann den schwankenden Momentenbedarf des aus Getriebebeschlag 25, Antriebshebel 29 und hinterer Schwinge 15 bestehenden Systems so ausgleichen, daß der als einfacher Gleichstrommotor ausgebildete Motor 19 ein nahezu konstantes Drehmoment liefern kann, d.h. keine nennenswerten Schwankungen der Motordrehzahl auftreten, welche störende Geräusche verursachen würden. BezugszeichenlisteA number of revolutions of the gear wheels 35 and 37 of the gear stage 21 are provided during operation. The fluctuating transmission ratio of the gear stage 21 can compensate for the fluctuating torque requirement of the system consisting of gear fitting 25, drive lever 29 and rear rocker 15 in such a way that the motor 19, which is designed as a simple DC motor, can deliver an almost constant torque, i.e. no significant fluctuations in the motor speed occur, which occur would cause annoying noises. LIST OF REFERENCE NUMBERS

Fahrzeugsitzvehicle seat

Einstelleradjuster

Sitzkissenseat cushions

Lehnerest

Sitzschiene vordere Schwinge hintere Schwinge, KomponenteSeat rail, front swing arm, rear swing arm, component

Sitzrahmen-SeitenteilSeat frame side part

Motorengine

Getriebestufegear stage

Getriebebeschlaggeared fitting

Antriebshebeldrive lever

Arm erstes Gehäuseteil zweites Gehäuseteil erstes Zahnrad zweites ZahnradArm first housing part second housing part first gear second gear

Lagerbuchse erste Drehachse zweite Drehachse Bearing bush first axis of rotation second axis of rotation

Claims

Patentansprüche claims 1. Einsteller für einen Fahrzeugsitz, insbesondere für einen Kraftfahrzeugsitz, mit einem antreibbaren Getriebebeschlag (25), wobei der angetriebene Getriebebeschlag (25) eine Komponente (15, 27) des Einstellers (3) und/oder des Fahrzeugsitzes (1) bewegt, dadurch gekennzeichnet, daß dem Getriebebeschlag (25) eine Getriebestufe (21) mit schwankendem Übersetzungsverhältnis vorgeschaltet ist.1. Adjuster for a vehicle seat, in particular for a motor vehicle seat, with a drivable gear fitting (25), the driven gear fitting (25) moving a component (15, 27) of the adjuster (3) and / or the vehicle seat (1), thereby characterized in that the gear fitting (25) is preceded by a gear stage (21) with a fluctuating transmission ratio. 2. Einsteller nach Anspruch 1, dadurch gekennzeichnet, daß die Getriebestufe (21) als Unrundgetriebe ausgebildet ist.2. Adjuster according to claim 1, characterized in that the gear stage (21) is designed as a non-circular gear. 3. Einsteller nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß ein Motor (19) mittels der Getriebestufe (21) den Getriebebeschlag (25) antreibt.3. Adjuster according to claim 1 or 2, characterized in that a motor (19) by means of the gear stage (21) drives the gear fitting (25). 4. Einsteller nach Anspruch 3, dadurch gekennzeichnet, daß die Getriebestufe (21) in den Motor (19) integriert ist.4. Adjuster according to claim 3, characterized in that the gear stage (21) is integrated in the motor (19). 5. Einsteller nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Getriebestufe (21) ein erstes Zahnrad (35) aufweist, welches um eine versetzt zum Flächenschwerpunkt der Verzahnungsgeometrie angeordnete erste Drehachse (41) drehbar ist.5. Adjuster according to one of claims 1 to 4, characterized in that the gear stage (21) has a first gear (35) which is rotatable about an offset to the center of gravity of the tooth geometry arranged first axis of rotation (41). 6. Einsteller nach Anspruch 3 oder 4 und Anspruch 5, dadurch gekennzeichnet, daß ein vom Motor (19) angetriebener Antriebs wellenstummel, auf dem das erste Zahnrad (35) drehfest sitzt, die erste Drehachse (41) definiert. 6. Adjuster according to claim 3 or 4 and claim 5, characterized in that a driven by the motor (19) drive shaft stub, on which the first gear (35) is rotationally fixed, defines the first axis of rotation (41). . Einsteller nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Getriebestufe (21) ein zweites Zahnrad (37) aufweist, welches um eine versetzt zum Flächenschwerpunkt der Verzahnungsgeometrie angeordnete zweite Drehachse (43) drehbar ist., Adjuster according to one of claims 1 to 6, characterized in that the gear stage (21) has a second gear (37) which can be rotated about a second axis of rotation (43) which is offset from the center of gravity of the toothing geometry. 8. Einsteller nach Anspruch 7, dadurch gekennzeichnet, daß ein den Getriebebeschlag (25) antreibender Abtriebswellenstummel, auf dem das zweite Zahnrad (37) drehfest sitzt, die zweite Drehachse (43) definiert.8. Adjuster according to claim 7, characterized in that a gear fitting (25) driving output shaft stub on which the second gear (37) is non-rotatably defines the second axis of rotation (43). 9. Einsteller nach einem der Ansprüche 5 bis 8, dadurch gekennzeichnet, daß die Getriebestufe (21) ein nahezu geschlossenes Gehäuse aufweist, innerhalb dessen die Zahnräder (35, 37) angeordnet sind.9. Adjuster according to one of claims 5 to 8, characterized in that the gear stage (21) has an almost closed housing, within which the gears (35, 37) are arranged. 10. Einsteller nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß der Einsteller (3) als Höheneinsteller zur Einstellung der Höhe eines Sitzkissens (5) ausgebildet und mit Schwingen, (13, 15) versehen ist, wobei der angetriebene Getriebebeschlag (25) wenigstens eine der Schwingen (15) als eine Komponente des Einstellers (3) und des Fahrzeugsitzes (1) bewegt.10. Adjuster according to one of claims 1 to 9, characterized in that the adjuster (3) is designed as a height adjuster for adjusting the height of a seat cushion (5) and is provided with rockers (13, 15), the driven gear fitting (25 ) moves at least one of the rockers (15) as a component of the adjuster (3) and the vehicle seat (1). 11. Fahrzeugsitz, insbesondere Kraftfahrzeugsitz, mit einem Einsteller nach einem der Ansprüche 1 bis 10. 11. Vehicle seat, in particular motor vehicle seat, with an adjuster according to one of claims 1 to 10.
EP04764500A 2003-09-05 2004-08-26 Adjuster for a vehicle seat Withdrawn EP1660343A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10341001A DE10341001B3 (en) 2003-09-05 2003-09-05 Adjuster for a vehicle seat
PCT/EP2004/009524 WO2005023579A1 (en) 2003-09-05 2004-08-26 Adjuster for a vehicle seat

Publications (1)

Publication Number Publication Date
EP1660343A1 true EP1660343A1 (en) 2006-05-31

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ID=34202392

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EP04764500A Withdrawn EP1660343A1 (en) 2003-09-05 2004-08-26 Adjuster for a vehicle seat

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US (1) US7306285B2 (en)
EP (1) EP1660343A1 (en)
BR (1) BRPI0406553A (en)
DE (1) DE10341001B3 (en)
WO (1) WO2005023579A1 (en)

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WO2005023579A1 (en) 2005-03-17
US7306285B2 (en) 2007-12-11
DE10341001B3 (en) 2005-03-17
US20060124820A1 (en) 2006-06-15
BRPI0406553A (en) 2005-12-20

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