DE102007034462A1 - Backrest i.e. snapping backrest, for motor vehicle seat, has two adjusting motors respectively attached to seat-backrest head module and lumbar support, for coupling seat-backrest head module and lumbar support to each other - Google Patents

Abstract

The backrest (1) has an adjusting motor attached to a seat-backrest head module (7), to pivot the seat-backrest head module at a joint axis (A) running in an area of a frame upper section (5) between side parts (3, 4). Another adjusting motor is attached to a lumbar support (21) to adjust the position of the lumbar support. The adjusting motors couple the seat-backrest head module and the lumbar support to each other in such a manner that the adjustment of the position of the lumbar support is linked to adjustment or pivoting movement of the seat-backrest head module at the joint axis.

Description

FIELD OF THE INVENTION

The The invention relates to a seat back for a motor vehicle with a preferably undivided backrest frame and a corresponding Automotive seat.

BACKGROUND OF THE INVENTION

A motor vehicle seat essentially consists of a seat part and a backrest mounted pivotably on it, which usually carries a longitudinally adjustable headrest on its upper side facing away from the seat part. The seat back can be made of several articulated braid parts connected as a so-called crease. Such a split seat back is for example from the DE 689 02 020 T2 known.

The individual backrest parts of a split seatback can to increase the seating comfort in addition to a Pivoting the entire seat back separately or individually pivoted become. However, such a split seat back design is manufacturing technology compared to an undivided one and thus in terms of the individual Backrest sections adjustable rigid seat back both manufacturing or assembly-related as well as with regard to accident safety (crash safety) particularly expensive.

To increase the seating comfort, vehicle seats with a lumbar region which can be deformed in the forward or rearward direction are known from the prior art, in particular with a so-called lordosis support for supporting the back region of a seat occupant. Such a vehicle seat is for example in the EP 0 423 079 A1 discloses and includes mat structures in the shoulder and lumbar vertebrae area, which can be adjusted together via a mechanically biasing cable mechanism.

at Vehicle seats with lumbar support is an adjustability the headrest in accordance with the adjustment of the lumbar support desirable for ergonomic reasons.

DE 10 2004 045 573 A1 discloses a vehicle seat with an ergo-mechanics in which elements forming an overall S-shaped backrest and arranged in the shoulder area and in the lumbar region are pivotally mounted about a horizontal axis such that without changing a tilting position of the backrest relative to the seat part by a Deformation of the shoulder region or the lumbar region in the reverse direction, a deformation of the lumbar region or the shoulder region in opposite directions, ie in the forward direction, can be adjusted. However, the seat does not have an adjustable height adjustable headrest.

DE 199 61 172 A1 discloses a vehicle seat in which the lumbar support and the headrest are coupled together so that an adjustment of the lumbar support in the direction of travel or upwards causes an adjustment of the headrest against the direction of travel or down and vice versa. For this purpose, a mechanical coupling device or a fluid coupling is provided.

DE 198 28 696 A1 discloses a vehicle seat having a pelvic support member which is displaceable relative to the seat back frame in the vehicle longitudinal direction and coupled to the headrest rod such that upon return displacement of the pelvic support member, the head restraint rod is pivoted forwardly with its upper headrest bearing end for forward displacement of the headrest can.

The However, the aforementioned structures of the vehicle seat are and installation technology comparatively expensive.

SUMMARY OF THE INVENTION

Of the Invention is therefore based on the task for a Motor vehicle seat to specify a seat back, both manufacturing and Mounting technology is simple and comfortable is.

These The object is achieved by the features of claim 1. Further advantageous embodiments are the subject of the dependent claims.

Consequently The present invention is based on a seat back for a motor vehicle seat, which has a backrest frame made of each other spaced side portions and one to these transverse Frame upper part is formed, a backrest head module, in the Backrest frame is inserted and for receiving a headrest is formed, and a lumbar support for supporting of the back of a seat occupant, which at a front the seat back is arranged; wherein the backrest head module a first Adjusting means is assigned to the backrest head module by a in the Area of the frame top between the side panels running Pivoting joint axis, and / or lumbar support second adjustment means is assigned to the location of the lumbar support adjust.

According to the invention, the backrest head module and the lumbar support are at least one Ver adjusting means coupled together so that the adjustment of the position of the lumbar support is coupled to an adjustment or a pivoting movement of the backrest head module about the hinge axis. This adjustment or pivoting movement takes place at the same time, so that the distance between the head of a seat occupant to the headrest remains unchanged during the adjustment or pivoting movement.

to Adjusting the position of the lumbar support can this in the direction of travel be set back or forward, so a back area the seat cushion convexly outward to arch or reset. In addition, a certain Height adjustment of the lumbar support or a be provided in the seating area projecting portion thereof. This adjustment of the lumbar support is inventively with a corresponding adjustment of the backrest head module coupled.

The Seat back includes a preferably undivided backrest frame and a backrest head module provided as a separate part. Of the Back frame has spaced from each other and arranged in the backrest longitudinal direction extending side parts and a transversely extending frame shell or Lehnenhaupt up.

The Backrest head module can be used in the undivided, rigid backrest frame and for an individual adjustment in the shoulder area of a user or passenger around one in the area the frame top between the side parts extending hinge axis pivotally held in or on the back frame.

The Invention is based on the consideration that on the one hand a manufacturing or assembly technology simply constructed as well On the other hand, safe and comfortable seat back are provided can, if starting from an undivided seat back or a rigid backrest frame the comfort aspect by a separate backrest component is realized. This in turn can be achieved by one that already fulfills the manufacturing or safety-relevant aspects undivided, rigid backrest frame with one alone the desired Comfort provided backrest complemented becomes. This is achieved by a backrest head module, i. H. through one in the top Backrest area as flexible as possible backrest accessible, with the simplest possible joint connection to the already simple in terms of manufacturing and safety-proven undivided frame system can be adapted.

Especially suitable are the backrest head module and the lumbar support coupled together so that when pivoting the backrest head module forward towards the seat occupant towards the lumbar support the pivoting direction to the rear, away from the seat user, is adjusted.

Especially the lumbar support is preferred by the second adjustment means pivoted. This pivoting movement is accompanied according to the invention from a corresponding counter-rotating pivoting movement the backrest head module with the headrest mounted therein. In this way, the transition of the human spine from a tense sitting posture to a relaxed posture reproduced in a natural way.

Prefers the first and second adjustment means are rigid or synchronous with each other coupled. Thus, a simultaneous adjustment of both the lumbar support as well as the backrest head module guaranteed in every position of the seat back so that the distance of the head of a seat occupant to the headrest unchanged during adjustment or pivoting movement remains.

According to one first embodiment, the backrest head module and the Lumbar support mechanically coupled together. This allows a Adjustment of the seat back adjustment basically also without adjusting motors in a comfortable way. For coupling can while arbitrary force transmitting transmission, for example Multi-link, gear, rack-and-pinion, Lever mechanisms, in particular pivot lever mechanisms, or the like be used. Basically suitable for mechanical coupling also a common suspension of lumbar support and backrest head module, for example, in or near a pivoting range, where the lumbar support is pivotally mounted on the backrest module is held.

According to one preferred embodiment is the first or the second Adjustment means an adjusting motor. In other words, it's just a single electric motor provided for adjustment. Due to the mechanical coupling of lumbar support and backrest module is sufficient for a single engine for simultaneous, in particular Synchronous, adjustment of both components. The common variable motor can either the Lehnenkopfmodul or the lumbar support adjust.

Particularly useful can be changed while the gear ratio of the coupling gear or a lever ratio of the common suspension of lumbar support and backrest module. For example, the transmission ratio can be changed by extending a guide rod of a transmission or multi-link mechanism, or by moving a pivot pin further away from the associated pivot axis is ordered. Or by switching to a gear with a different number of teeth, the gear ratio of a gear transmission or gear rack gear can be changed.

According to one second embodiment, the first and the second adjusting means designed as adjusting motors that are electronically coupled together or synchronized to the adjustment of the location of the lumbar support with an adjustment or pivoting movement of the backrest head module to synchronize the hinge axis. The synchronization can while aware of the adjustment characteristics of lumbar support and backrest module by simply monitoring the speed and accomplished the rotational position of the respective adjusting motor become.

For this are the two adjusting motors with a common control or Control device coupled, which synchronizes the Adjusting the position of the lumbar support with the adjustment or the pivotal movement of the backrest head module about the hinge axis causes.

Around synchronization can, in particular, be a setting especially monitors a tendency of the lumbar support and the backrest head module be the common control or regulating device the Synchronization based on the particular setting Signals accomplished. The attitude, especially inclination, the lumbar support and the backrest head module can be used in any Way scanned electronically, optically or mechanically become.

through the common control or regulating device leaves the synchronization ratio between the setting the position of the lumbar support and the adjustment or the Pivoting movement of the backrest head module about the hinge axis in a simpler Change way.

The Lehnenkopfmodul is particularly advantageous multi-part structure and comprises a module carrier, also referred to below as a module cross member. With the module carrier a swing frame is firmly connected, with the turn a frame-like support stop or support frame preferably via a slide-guided guided Adjustment element is connected. The adjustment runs along a sliding or adjustment axis, transverse to the through Module support formed hinge axis and this in the backrest longitudinal direction spaced runs.

at an adjusting movement of the adjusting element for pivoting the Lehnenkopfmoduls is the swing frame about the hinge axis in the pivoting direction moves while the backrest module over the support stop on the back frame and there preferably supported on the frame top in the manner of an abutment. For this purpose, the adjustment element is preferably driven by an electric motor.

The Lehnenkopfmodul is also expediently for Recording a headrest formed. This is suitable especially the swing frame by this U-shaped design is and the U-legs as a sleeve-shaped frame sides are formed. The frame sides then each take a support strut the headrest, which in turn expediently Electromotive height-adjustable in backrest direction is.

The Lehnenkopfmodul is also advantageously for attachment formed a lumbar support. For this purpose, the Lehnenkopfmodul expediently two holding elements, for example in the form of eyelets, on. Into the grommets can a lumbar support mounted in a simple manner become. The retaining elements are located on the frame top opposite bottom of the hinge axis of the backrest head module. By this arrangement it is achieved that when pivoting of the backrest head module in the direction of pivoting forward the suspension for the lumbar support against the pivoting direction is pivoted to the rear. This will be a particularly advantageous Adjustment of the seat back in the shoulder and back area of a passenger and thus achieve a high level of comfort.

The particular advantages of the invention are that by providing and using a separate backrest head part in an otherwise undivided and rigid backrest frame a high Sitting comfort combined with a simple and safe construction of the seat back a motor vehicle seat is reached. The provision of a Such Lehnenkopfteils as a module assembly technology is particularly advantageous and allows such a backrest head module also in already existing undivided backrest frames later can be installed. Such a backrest head module is in principle can also be used in conjunction with a split seat backrest.

at The lumbar support is expedient a flat, sufficiently flexible mat or lattice-like Structure that provides the back of a vehicle occupant in sufficient Mechanically supported. The lumbar support can be provided with a plurality of perforations and is preferably formed of a thin plastic plate. This is to a frame shell in the seat backrest longitudinal direction mounted opposite frame base or connected to it.

FIGURE OVERVIEW

following Be embodiments of the invention with reference to drawings explained in more detail. Show:

1 a perspective view of a backrest with undivided back frame, hinged lumbar lintels and inserted backrest head module,

2 the backrest head module according to 1 .

3 and 4 the backrest head module without headrest cushion in front and rear view,

5a and 5b Side views of the seat back according to 1 with the backrest head module in two different tilt positions,

6a and 6b the inclination positions of the backrest head module in the inclination positions according to 5a and 5b .

7 in a schematic side view of the seat back according to 1 in two different inclination positions of the backrest head module and the lumbar support coupled thereto,

8th in a schematic representation of a seat back according to the present invention with a mechanical coupling between lumbar support and backrest head module in two different inclination positions of the backrest head module, and

9 in a schematic representation of a seat back according to the present invention with an electronic coupling between lumbar support and backrest head module in two different inclination positions of the backrest head module.

each other corresponding parts are in all figures with the same reference numerals Mistake.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

1 shows a seat back 1 for a motor vehicle seat, the seat part is not shown. The seat back 1 , whose usually existing backrest upholstery is not shown, includes a backrest frame 2 with two side parts 3 . 4 and a frame shell or backrest main 5 , The frame top 5 connects the two sides 3 and 4 on the back of a back 6 opposite backrest top. At the backside base 6 is the backrest frame 2 hingedly connected in a manner not shown with the seat portion of the vehicle seat.

Between the side panels 3 . 4 and the frame top 5 as well as the frame base 6 is a Lehnenebene spanned. The seat back 1 can in Lehnenlängsrichtung z, along which the back of a passenger between the hip and the head extends, more or less as in one of the lower backrest side facing lower backrest area and the frame top part 5 facing and this enclosing upper backrest area and an intermediate central backrest area are considered divided.

In the upper backrest area - and thus in the area of the frame top 5 - is in the backrest frame 2 a backrest head module 7 used. The backrest head module 7 is pivotable about a hinge axis A in the x direction of the coordinate system shown. For this purpose, the Lehnenkopfmodul 7 a traverse referred to below as a module carrier 8th on, the both ends over joint connections 8a . 8b with the side parts 3 respectively. 4 articulated or rotatably connected. On the frame shell 5 opposite side of the hinge axis A is to the backrest head module 7 - and there to the module carrier 8th - An eyelet pair with two holding elements 9 for suspension of the lumbar support shown schematically 21 intended. Based on these as suspensions for the lumbar support serving holding elements 9 the lumbar support extends 21 over the middle backrest area into the lower backrest area. The lumbar support 21 is thus at a certain distance a to the hinge axis A between the side parts 3 and 4 the backrest frame on the backrest head module 7 suspended. This distance is essentially due to the length of the hook-like holding elements 9 predetermined and can thus be tailored to the seat back geometry in a simple manner.

Like from the 2 to 4 and 6 is comparatively clear, is the backrest head module 7 executed in several parts. So includes the backrest head module 7 in addition to the module carrier 8th a swing frame 10 and a support post, also referred to below as a support frame 11 , The swing frame 10 in turn comprises two mutually spaced and in the backrest longitudinal direction z extending frame legs 10a . 10b and a connecting this pivoting crosshead 10c , This runs at a distance b to the module carrier 8th and thus in backrest longitudinal direction z at a distance b above the hinge axis A on the holding elements 9 opposite axis side parallel to the module carrier 8th in the y direction of the illustrated coordinate system.

The frame-like support stop 11 has a turn at a distance b to the hinge axis A and parallel to the module carrier 8th extending support beam 11c as well as two to the frame sides 10a and 10b of the swing frame 10 parallel frame legs 11a respectively. 11b on. While the swing frame 10 over its frame sides or frame legs 10a . 10b with the module carrier 8th is firmly connected, is the support frame 11 with its support beam 11c on the swing frame 10 and there at the pivoting beam 10c held. This holding connection is designed to slide. This is an adjustment 12 provided, preferably as by an electric or drive motor 13 driven adjusting spindle is executed.

The adjusting element 12 in turn extends approximately at a distance b to the module carrier 8th in the x direction of the illustrated coordinate system and thus runs transversely to the hinge axis A. The drive motor 13 of the adjusting element 12 is in the illustrated embodiment in or in the region of the swivel traverse 10c and thus in or on the swing frame 10 arranged or held.

In the sleeve-shaped frame sides 10a . 10b of the backrest head module 7 are struts or support rods 14 a headrest 15 used, their padded headrest top 16 in the 3 and 4 is omitted. The headrest 15 is by means of a in the backrest head module 7 integrated, expediently in the region of the module carrier 8th arranged, for example, electric motor drive 17 height adjustable in backrest direction z in the manner of a straight guide.

In the 5a to 6b is the pan or tilt mechanism of the backrest head module 7 illustrated. So show the 5a respectively. 6a the backrest module 7 in an initial or investment position while in the 5b respectively. 6b the backrest module 7 is shown in a pivoting or tilting position along the pivoting or pivoting direction running in the x-direction of the illustrated coordinate system.

In an adjustment of the example by means of the electric motor 13 driven adjusting element 12 becomes the swing frame 10 of the backrest head module 7 about the axis of rotation A extending in the y-direction in the pivoting x moves. As a result, the backrest head module tilts 7 in the direction of pivoting (+) x to from. The support stop 11 is stationary by the backrest head module 7 over the support stop 11 on the backrest frame 2 and there on the frame top 5 supported. Together with the swing frame 10 The headrest also tilts 15 along an arcuate pivoting path c in the pivoting direction (+) x forward.

Synchronous with this tilting movement of the headrest 15 also pivot the retaining elements 9 of the backrest head module 7 along a circular arc-shaped pivoting path d in to the pivoting direction (+) x of the headrest 15 opposite swivel direction (-) x. One in the retaining elements 9 hinged or attached lumbar support is thus at a pivoting of the backrest head module 7 in the pivoting direction (+) x to the front due to the opposite pivoting direction (-) x in this area of the holding elements 9 pivoted backwards. This fits the seat back 1 during an adjustment or inclination movement of the backrest head module 7 not only in the head area, but also in the shoulder and back area of a passenger.

Again 6b can be removed, the length of the pivoting path d through the length of the eye-like holding elements 9 or by the distance a of the front ends of the holding elements to the pivot axis A (see. 1 ) clearly specified. As a result, a vote of Lordosisverstellung to the geometry of the seat back can be achieved in a simple manner. Again 6b can be removed, the ratio of the pivoting paths c and d is essentially determined by the length of the two protruding from the pivot axis A lever arms.

The synchronous pivoting of the holding elements 9 for inclination movement of the headrest 15 is in a juxtaposition in a superimposed representation in the 7 shown. Therein, the backrest head module is shown in an initial position and a maximum pivoted position. It can be seen that due to the pivoting movement, a certain extension of the distance of the suspension of the lumbar support 21 in the eye-like holding elements 9 is due to the frame base of the seat back. In the embodiment according to the 7 the lumbar support cambers 21 due to this pivoting movement. More specifically, the lumbar support 21 in the front pivot position of the headrest 15 relatively flat arched and in the rear pivot position of the headrest 15 arched comparatively strong convex towards the vehicle occupant. This requires a certain inherent rigidity of the lumbar support 21 , which corresponds to the requirement of sufficient support of the back of the vehicle occupant by the lumbar support 21 ,

According to an alternative embodiment, the aforementioned extension of the distance of the suspension of the lumbar support 21 in the eye-like holding elements 9 be compensated for the frame base of the seat back by the suspension of the lumbar support in the seat back itself. For this purpose, the hook-like hangers mente 21 at the upper end of the lumbar support 21 have a certain elasticity and / or the suspension or connection of the lumbar support with the frame lower part have a certain elasticity. Or this elasticity is due to the material properties of the lumbar support 21 self-inflicted.

Based on 8th and 9 Further details of the coupling between lumbar support and backrest head module will be described below.

According to the 8th Can the inclination of the backrest head module 7 by an adjusting motor 40 be adjusted. More specifically, the backrest head module 7 by adjusting the adjustment motor 40 around the crossbar 8th pivoted, as indicated by the dashed lines. Through a transmission 42 or another mechanical coupling device is the backrest head module 7 and the lumbar support 21 mechanically coupled with each other. Thus, when adjusting the backrest head module 7 at the same time the lumbar support 21 in a similar way, as by the translation of the transmission 42 or the geometry and design of the mechanical coupling predetermined, adjusted, as indicated by the dashed lines. In this case, the mechanical coupling is preferably designed so that upon pivoting of the back head module in the forward direction on the seat occupant to the lumbar support opposite, ie in the backward direction and away from the seat user, is pivoted and / or in a displacement of the back head module upwards the lumbar support opposite, ie is moved down.

Of course, instead of the backrest head module 7 also the lumbar support 21 an adjusting motor 41 be assigned. Due to the mechanical coupling, the lumbar support can 21 and the backrest module 7 be adjusted by a single adjusting motor.

Although it has been described above that the lumbar support 21 and the backrest module 7 be adjusted by an adjusting motor, the above statements on mechanical coupling apply in a corresponding manner, even in the event that the lumbar support 21 and the backrest module 7 can only be operated manually by a mechanical adjustment mechanism.

The 9 shows a seat back, in which the lumbar support 21 and the backrest module 7 electronically coupled or synchronized. For this purpose, the lumbar support 21 an adjusting motor 46 and the backrest head module 7 an adjusting motor 45 assigned. The electric adjusting motors 45 . 46 be from a common control or regulating device 49 , For example, a central processing unit (CPU) or an ASIC, via the data line 50 controlled synchronously, so that the adjustment of the position of the lumbar support 21 with an adjustment or a pivoting movement of the backrest head module 7 around the module carrier 8th is synchronized to ensure that the distance of the head of a seat occupant to the headrest 15 remains unchanged during the adjustment or pivoting movement.

For synchronization, the rotational speed and / or rotational position of the adjusting motors 45 . 46 detected and to the control or regulation device 49 be transmitted. Additionally or alternatively, the lumbar support 21 and the backrest head module 7 mechanical, electrical, electronic, optical or magnetic sensors 47 . 48 be assigned, their signals to the control or regulating device 49 be transmitted. On the basis of these signals then the synchronization of the adjustment of the position of the lumbar support 21 with the adjustment or the pivoting movement of the backrest head module 7 around the module carrier 8th ,

1

seatback

2

back frame

3, 4

side panel

5

Upper frame / rear main

6

Sit bottom

7

Sit head module

8th

Module carrier / Traverse

8a, b

articulation

9

retaining element

10

swing frame

10a, b

frame side

10c

swivel Traverse

11

/ Frame Stützanschlag-

11a, b

frame legs

11c

Traverse support

12

Adjustment / control element

13

drive motor

14

Stabilizer

15

headrest

16

Headrest shell

20

hook

21

lumbar support

22

perforation

30

(Large-scale) cushion support

31

connecting strut

40

adjustment

41

adjustment

42

Transmission / mechanical coupling device

45

adjusting

46

adjusting

47

sensor

48

sensor

49

Control / regulating device

50

data line

A

joint axis

a, b

distance

c, d

pivoting

x

Swivel Nerschwenkrichtung

z

Backrest longitudinal direction

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 68902020 T2 [0002]
• EP 0423079 A1 [0004]
• DE 102004045573 A1 [0006]
• - DE 19961172 A1 [0007]
• - DE 19828696 A1 [0008]

Claims (24)

Seat backrest ( 1 ) for a motor vehicle seat, comprising: a backrest frame ( 2 ), which consists of spaced-apart side parts ( 3 . 4 ) and to this transversely extending frame top ( 5 ) is trained; a backrest head module ( 7 ) in the backrest frame ( 2 ) is used and for receiving a headrest ( 15 ) is trained; and a lumbar support ( 21 ) for supporting the back of a seat occupant seated on a front side of the seat back ( 1 ) is arranged; where: the backrest head module ( 7 ) a first adjusting means ( 40 ; 45 ) is assigned to the backrest head module ( 7 ) in the area of the upper frame ( 5 ) between the side parts ( 3 . 4 ) pivoting hinge axis (A), and / or the lumbar support ( 21 ) a second adjustment means ( 41 ; 46 ) is adjusted to adjust the position of the lumbar support, and the backrest head module ( 7 ) and the lumbar support ( 21 ) are coupled to one another via at least one adjusting means such that the adjustment of the position of the lumbar support with an adjustment or a pivoting movement of the backrest head module ( 7 ) is coupled about the hinge axis (A). Seat back according to claim 1, wherein the backrest head module ( 7 ) and the lumbar support ( 21 ) are coupled to each other so that when pivoting the backrest head module forward on the seat occupant to the lumbar support against the pivoting direction to the rear, away from the seat user, is adjusted. Seat back according to one of the preceding claims, wherein the lumbar support by the second adjusting means is pivoted. Seat back according to one of the preceding claims, wherein the first and second adjusting means rigidly or synchronously with each other are coupled. Seat back according to claim 4, wherein the backrest head module ( 7 ) and the lumbar support ( 21 ) are mechanically coupled together. Seat back according to claim 5, wherein the first or the second adjusting means is an adjusting motor. Seat back according to claim 6, wherein the adjusting motor ( 45 ) the backrest head module ( 7 ) and the backrest head module ( 7 ) and the lumbar support ( 21 ) via a transmission ( 42 ) or a common suspension ( 9 . 20 ) are coupled together. Seat back according to claim 6, wherein the adjusting motor ( 46 ) the lumbar support ( 21 ) and the backrest head module ( 7 ) and the lumbar support ( 21 ) via a transmission ( 42 ) or a common suspension ( 9 . 20 ) are coupled together. Seat back according to claim 7 or 8, wherein a transmission ratio of the transmission ( 42 ) or a lever ratio of the common suspension ( 9 . 20 ) is changeable. Seat back according to one of claims 5 to 9, wherein the backrest head module ( 7 ) a truss-like module carrier ( 8th ), which at the side parts ( 3 . 4 ) is held articulated and the backrest head module ( 7 ) on the frame top ( 5 ) facing away back side ( 6 ) at least one retaining element ( 9 ) for suspending a lumbar support ( 21 ) having. Seat back according to claim 10, wherein each of the retaining elements ( 9 ) on the frame top ( 5 ) opposite side of the hinge axis (A) on Lehnenkopfmodul ( 7 ) are held. Seat back according to claim 10 or 11, wherein the lumbar support ( 21 ) with hook-shaped sections ( 20 ) in associated eye-like hook elements ( 9 ) in the area of the frame shell ( 5 ) and in a frame top ( 5 ) opposite frame lower part ( 6 ) is attached or connected to this. Seat back according to one of claims 1 to 4, wherein the first and the second adjusting means an adjusting motor ( 45 . 46 ), which are synchronized with each other electronically to adjust the position of the lumbar support with an adjustment or a pivoting movement of the backrest head module ( 7 ) to synchronize about the hinge axis (A). Seat back according to claim 13, wherein the adjusting motors ( 45 . 46 ) with a common control device ( 49 ), which synchronize the adjustment of the position of the lumbar support with the adjustment or the pivoting movement of the backrest head module ( 7 ) around the hinge axis (A). Seat back according to claim 13 or 14, wherein the lumbar support ( 21 ) and the backrest head module ( 7 ) Sensors ( 47 . 48 ), which detect a position, in particular an inclination, of the same, wherein the synchronization of the common control or regulating device ( 49 ) is effected on the basis of output signals from the sensors. Seat back according to one of claims 13 to 15, wherein a synchronization ratio between the adjustment of the position of the lumbar support and the adjustment or the pivoting movement of the Leh head module ( 7 ) is variable about the hinge axis (A). Seat back according to one of the preceding claims, wherein the backrest head module ( 7 ) a swing frame ( 10 ) with a distance to the hinge axis (A) and along the frame top ( 5 ) extending pivoting crosshead ( 10c ) having. Seat back according to claim 17, wherein the swing frame ( 10 ) U-shaped with over the pivoting beam ( 10c ) interconnected frame pages ( 10a . 10b ) are formed. Seat back according to one of the preceding claims 1 to 4, wherein the backrest head module ( 7 ) a frame-like support stop ( 11 ) with a support crossbar ( 11c ) and a sliding movably guided adjusting element ( 12 ) having. Seat back according to claim 19, wherein during an adjusting movement of the adjusting element ( 12 ) the swing frame ( 10 ) of the backrest head module ( 7 ) opposite to the frame top ( 5 ) fixed adjacent support stop ( 11 ) pivoted about the hinge axis (A). Seat back according to claim 20, wherein the headrest ( 15 ) in the backrest head module ( 7 ) both in the backrest longitudinal direction (z) guided in height adjustable and about the hinge axis (A) is held adjustable in inclination. Seat back according to claim 21, wherein the backrest head module ( 7 ) an electric motor drive ( 17 ) for height adjustment of the headrest ( 15 ) having. Motor vehicle seat with a seat back after a of claims 1 to 17. Motor vehicle seat according to claim 22, wherein the seat back is designed as a crease.