WO2008037754A2

WO2008037754A2 - Backrest for a motor vehicle and motor vehicle seat

Info

Publication number: WO2008037754A2
Application number: PCT/EP2007/060237
Authority: WO
Inventors: Peter Wanke; Jens Buchholz
Original assignee: Brose Fahrzeugteile Gmbh & Co. Kg, Coburg
Priority date: 2006-09-26
Filing date: 2007-09-26
Publication date: 2008-04-03
Also published as: DE202007010292U1; WO2008037754A3

Abstract

The invention relates to a backrest (1) for a motor vehicle seat, comprising a unitary backrest frame (2), made up of two lateral pieces (3,4) arranged at a distance from each other and a frame upper piece (5) running perpendicular to the above. According to the invention, a backrest head module (7) may be inserted in the backrest frame (2) and is retained such as to be pivotable about a joint axis (A) running between the lateral pieces (3,4) in the region of the frame upper part (5). The backrest head module can be produced as a separate component and can be adapted to a unitary frame system of simple design for construction and of proven safety by means of a simple joint connection.

Description

Seat back for a motor vehicle and motor vehicle seat

FIELD OF THE INVENTION

The invention relates to a seat back for a motor vehicle with an undivided back frame and a corresponding motor vehicle 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 known for example from DE 689 02 020 T2.

The individual backrest parts of a split seat back can be pivoted separately or individually to increase the seating comfort in addition to a pivoting of the entire seat back. However, such a split seat back design is manufacturing technology compared to an undivided and thus in terms of individual backrest areas rigid seat back both manufacturing or assembly technology and in terms of accident safety (crash safety) particularly expensive.

SUMMARY OF THE INVENTION

The invention is therefore based on the object to provide a seat back for a motor vehicle seat, which is both simple in terms of manufacturing and assembly technology and safety as reliable as possible and comfortable.

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

According to the invention, a seat back comprises an undivided backrest frame and a backrest head module provided as a separate part. The backrest frame has spaced-apart side parts extending in the longitudinal direction of the backrest and a frame upper part or backrest main that extends transversely to the backrest.

The backrest head module can be used in the undivided, rigid backrest frame and held pivotally in or on the backrest frame for an individual adjustment possibility in the shoulder region of a user or passenger about a hinge axis extending between the side parts in the region of the frame upper part.

The invention is based on the consideration that, on the one hand, a production or assembly technology of simple construction and on the other hand safe and comfortable seat back can be provided when starting from an undivided seat back or a rigid backrest frame comfort aspect is realized by a separate backrest component. This, in turn, can be achieved by supplementing an undivided, rigid backrest frame, which already satisfies the production or safety-relevant aspects, with a backrest part which alone provides the desired comfort. This is achieved by a backrest head module, i. achievable by a flexible backrest part in the upper backrest area that can be adapted with the simplest possible articulated connection to the production technology already simple and safety-proven undivided frame system.

The backrest head module is constructed in several parts and includes a below as well

Module crossbar designated module carrier. With the module carrier a pivoting frame is firmly connected, with which in turn a frame-like support stop or support frame is preferably connected via a sliding movably guided adjustment. The adjusting element runs along a sliding or adjusting axis, which extends transversely to the hinge axis formed by the module carrier and spaced therefrom in the backrest longitudinal direction.

During an adjusting movement of the adjusting element for pivoting the backrest head module, the pivoting frame is moved about the hinge axis in the pivoting direction, while the backrest head module is moved over the supporting stop on the backrest 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 backrest head module is also suitably designed for receiving a headrest. For this purpose, the swing frame is particularly suitable by this U-shaped and the U-legs are formed as a sleeve-shaped frame sides. The frame sides then each take on a support strut of the headrest, which in turn is suitably height-adjustable by electric motor Lehnenlängsrichtung.

The backrest head module is furthermore advantageously designed for fastening a lumbar support. For this purpose, the backrest head module expediently has two holding elements, for example in the form of holding eyes. In the eyelets lumbar support can be hung in a simple manner. The retaining elements are located on the opposite side of the frame top underside of the hinge axis of the backrest head module. By this arrangement it is achieved that in a pivoting of the backrest head module in the pivoting direction forward, the suspension for the lumbar support is pivoted against the pivoting direction to the rear. As a result, a particularly advantageous adaptation of the seat back in the shoulder and back area of a passenger and thus a high level of comfort are achieved.

The advantages achieved by the invention are in particular that a high level of comfort is achieved with the same time simple and safe construction of the seat back of a motor vehicle seat by providing and using a separate backrest head part in an otherwise undivided and rigid backrest frame. The provision of such Lehnenkopfteils as a module is particularly advantageous mounting technology and allows such a backrest head module can be retrofitted into existing undivided backrest frame. Such a backrest head module can in principle also be used in conjunction with a split seat backrest.

The lumbar support is expediently a flat, sufficiently flexible mat or lattice-like structure which mechanically supports the back of a vehicle occupant in a sufficient manner. The lumbar support can be provided with a plurality of perforations and is preferably formed from a thin plastic plate. This is opposite to a frame upper part in the seat backrest longitudinal direction Hinged frame part or connected to this.

FIGURE OVERVIEW

Embodiments of the invention will be explained in more detail with reference to drawings. Show:

Fig. 1 in perspective view a seat back with undivided

Backrest frame, lumbar camber and hinged head module inserted in it,

2 shows the backrest head module according to FIG. 1, FIG.

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

5a and 5b are side views of the seat back according to FIG. 1 with the backrest head module in two different inclination positions, FIG.

Fig. 6a and 6b, the inclination positions of the backrest head module in the tilt positions of FIG. 5 a and 5 b, and

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

Corresponding parts are provided in all figures with the same reference numerals.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Fig. 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, comprises a back frame 2 with two side parts 3, 4 and a frame upper part or backrest main 5. The frame top part 5 connects the two side parts 3 and 4 on the upper side of a backrest 6 opposite the backrest. On the backrest base 6 of the back frame 2 is pivotally connected in a manner not shown with the seat portion of the vehicle seat. Between the side parts 3, 4 and the frame top 5 and the frame bottom 6 a backrest plane is clamped. The backrest 1 can be seen in the backrest longitudinal direction z, along which the back of a passenger between the hip and the head extends, considered as a lower backrest portion facing the back of a lower back and the frame top 5 facing and enclosing this upper backrest area and an intermediate central backrest area divided become.

In the upper backrest area - and thus in the area of the frame upper part 5 - a backrest head module 7 is inserted into the backrest frame 2. The backrest head module 7 is pivotable about a hinge axis A in the x direction of the illustrated coordinate system. For this purpose, the backrest head module 7 has a traverse 8, referred to below as a module carrier, which is connected to the side parts 3 and 4 in an articulated or rotationally movable manner at both ends via joint connections 8a, 8b. On the side opposite the frame top 5 side of the hinge axis A is provided to the backrest head module 7 - and there to the module carrier 8 - a Ösenpaar with two holding elements 9 for suspending the lumbar support 21 shown schematically. Starting from these holding elements 9 serving as suspensions for the lumbar support, the lumbar support 21 extends over the middle backrest region into the lower backrest region. The lumbar support 21 is thus suspended at a certain distance a from the hinge axis A between the side parts 3 and 4 of the backrest frame on the backrest head module 7. This distance is essentially predetermined by the length of the hook-like holding elements 9 and can thus be tuned in a simple manner to the seat back geometry.

As can be seen comparatively clearly from FIGS. 2 to 4 and 6, the backrest head module 7 is designed in several parts. Thus, in addition to the module carrier 8, the backrest head module 7 comprises a pivot frame 10 and a support stop 11, also referred to as a support frame. The pivot frame 10 in turn comprises two frame legs 10a, 1b spaced apart and in the backrest direction z and a pivoting crosshead 10c connecting them. This runs at a distance b to the module carrier 8 and thus in the backrest direction z at a distance b above the hinge axis A on the opposite axis of the holding elements 9 parallel to the module carrier 8 in y-

Direction of the represented 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 8 extending support cross 11c and two to the frame sides 10a and 10b of the swing frame 10 parallel frame legs I Ia and I Ib on. While the swing frame 10 is fixedly connected via the frame sides or frame legs 10a, 10b to the module carrier 8, the support frame 11 is held with the support cross 11 c on the swing frame 10 and there on the pivoting cross member 10c. This holding connection is designed to slide. For this purpose, an adjusting element 12 is provided, which is preferably designed as driven by an electric or drive motor 13 adjusting spindle.

The adjusting element 12 in turn extends approximately at a distance b from the module carrier 8 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 pivoting traverse 10c and thus in or . arranged or held on the swing frame 10.

In the sleeve-shaped executed frame sides 10a, 10b of the backrest head module 7 support struts or support rods 14 of a headrest 15 are used, the padded headrest upper part 16 in Figs. 3 and 4 is omitted. The headrest 15 is height-adjustable by means of an integrated into the backrest head module 7, conveniently in the region of the module carrier 8, for example, electric motor drive 17 in backrest length z in the manner of a straight line.

FIGS. 5 a to 6 b illustrate the pivoting or tilting mechanism of the backrest head module 7. Thus, Figs. 5a and 6a show the backrest head module 7 in an initial or abutment position, while in Figs. 5b and 6b, the

Lehnenkopfmodul 7 is shown in a pivoting or tilting position along the running in the x direction of the coordinate system shown pivoting or pivoting. ,

In an adjusting movement of the example driven by the electric motor 13

Adjustment element 12, the pivot frame 10 of the backrest head module 7 is moved about the y axis extending hinge axis A in the pivoting x. As a result, the backrest head module 7 inclines in the pivoting direction (+) x forward. The support stop 11 is stationary by the backrest head module 7 on the support stop 11 on Back frame 2 and there on the frame top 5 is supported. Together with the swing frame 10, the headrest 15 inclines along an arcuate pivoting path c in the pivoting direction (+) x to from.

Synchronously with this tilting movement of the headrest 15, the holding elements 9 of the backrest head module 7 also pivot along an arcuate pivoting path d in the direction of pivoting (+) x of the headrest 15 opposite pivoting direction (-) x. A lumbar support hinged or fastened in the holding elements 9 is thus pivoted backwards in a pivoting direction of the backrest head module 7 in the pivoting direction (+) x due to the opposite pivoting direction (-) x in this region of the holding elements 9. As a result, the seat back 1 adapts 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.

As can be seen from Fig. 6b, the length of the pivoting path d is uniquely determined by 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 Fig .. 1). As a result, a vote of Lordosisverstellung to the geometry of the seat back can be achieved in a simple manner. As can be seen from FIG. 6b, the ratio of the pivoting paths c and d is predetermined essentially by the length of the two lever arms projecting from the pivot axis A.

The synchronous pivoting of the holding elements 9 for tilting movement of the headrest 15 is shown in a juxtaposition in a superimposed representation in FIG. 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 between the suspension of the lumbar support 21 in the eye-like holding elements 9 is due to the lower frame of the seat back. In the embodiment according to FIG. 7, the lumbar support 21 cambers due to this pivoting movement. More specifically, the lumbar support 21 in the front pivotal position of the headrest 15 is comparatively shallow arched and arched in the rear pivot position of the headrest 15 comparatively strong convex toward the vehicle occupant. This requires a certain inherent rigidity of the lumbar support 21, which corresponds to the requirement for 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 to the frame base of the seat back can also be compensated by the suspension of the lumbar support in the seat back itself. For this purpose, the hook-like suspension elements 21 may have a certain elasticity at the upper end of the lumbar support 21 and / or may have the suspension or connection of the lumbar support with the frame lower part over a certain elasticity. Or this elasticity is applied by the material properties of the lumbar support 21 itself.

The present application claims the priority of German patent application DE 10 2006 045 387.5 "Seat back for a motor vehicle", filed on 26 September 2006, the entire contents of which are hereby expressly included by way of reference for purposes of disclosure.

LIST OF REFERENCE NUMBERS

1 seat back

2 backrest frames

3, 4 side panel

5 frame top / backrest main

6 backrest base

7 backrest head module

8 module carrier / traverse

8a, b joint connection

9 retaining element

10 swing frame

10a, b frame side

10c swivel rail

11 support frame

I Ia, b frame legs

11 c Support crossbar

12 adjustment / actuator

13 drive motor

14 support rod

15 headrest

16 headrest top

20 hooks

21 lumbar support

22 holes

A joint axis a, b distance c, d pivoting path

X Swiveling / swiveling

Z Lehnenlängsrichtung

Claims

1. seat back (1) for a motor vehicle seat, with one of spaced-apart side parts (3,4) and one of these transverse frame top part (5) formed undivided back frame (2), and with a in the

Lehnenrahmen module (2) insertable backrest head module (7), which is pivotally held about a in the region of the upper frame part (5) between the side parts (3,4) extending hinge axis (A).

2. Seat back (1) according to claim 1, characterized in that the backrest head module (7) has a truss-like module carrier (8), which is articulated on the side parts (3, 4).

3. Seat back (1) according to claim 1 or 2, characterized in that the backrest head module (7) has a pivot frame (10) with a hinge axis

(A) spaced and along the frame top (5) extending pivoting crosshead (10c).

4. seat back (1) according to claim 3, characterized in that the pivot frame (10) U-shaped with the pivoting cross-member (10c) interconnected frame sides (10a, 10b) are formed.

5. Seat backrest (1) according to one of claims 1 to 4, characterized in that the backrest head module (7) has a frame-like support stop (11) with a support bar (l lc).

6. seat back (1) according to claims 1 to 5, characterized in that the backrest head module (7) has a sliding movably guided adjusting element (12).

7. seat back (1) according to claim 6, characterized in that during an adjusting movement of the adjusting element (12) of the pivot frame (10) of the backrest head module (7) relative to the frame upper part (5) fixed adjacent support stop (1 1) about the hinge axis ( A) pivoted.

8. Seat back (1) according to one of claims 1 to 7, characterized in that the backrest head module (7) for receiving a headrest (15) is formed.

9. seat back (1) according to claim 8, characterized in that the headrest (15) in the backrest head module (7) both in the backrest longitudinal direction (z) guided vertically adjustable and about the hinge axis (A) is held adjustable in inclination.

10. Seat backrest (1) according to claim 8 or 9, characterized in that the backrest head module (7) has an electromotive drive (17) for

Height adjustment of the headrest (15).

11. Seat back (1) according to one of claims 1 to 10, characterized in that the backrest head module (7) has an electric motor drive (13) for tilt adjustment.

12. Seat backrest (1) according to one of claims 1 to 11, characterized in that the backrest head module (7) on the frame upper part (5) facing away from backrest side (6) at least one holding element (9) for suspending a lumbar support (21).

13. seat back (1) according to claim 12, characterized in that each of the holding elements (9) on the frame upper part (5) opposite side of the hinge axis (A) on the backrest head module (7) are held.

14. seat back (1) according to claim 12 or 13, wherein the lumbar support (21) with hook-shaped portions (20) in associated eyelet-like hook elements (9) in the region of the upper frame part (5) is mounted and in the frame upper part (5) opposite frame base (6) is attached or connected to it.

15. Motor vehicle seat with a seat back (1) according to one of claims 1 to 14.