WO2020201017A1

WO2020201017A1 - Backrest for a seat

Info

Publication number: WO2020201017A1
Application number: PCT/EP2020/058563
Authority: WO
Inventors: Andreas Ulrichs; Ralf Stegmeyer; Daniel Nierhoff; Tilo BERTRAM
Original assignee: Thyssenkrupp Steel Europe Ag
Priority date: 2019-04-03
Filing date: 2020-03-26
Publication date: 2020-10-08
Also published as: DE102019204727A1

Abstract

The invention relates to a backrest (1) for a seat, in particular for a vehicle front seat (10), comprising: two backrest lateral parts (2), each formed by two integrally connected profiles (2.1, 2.2), an inner profile (2.1) and an outer profile (2.2), wherein same have a varying cross-section in at least sections in their longitudinal extension (L); an upper backrest crosspiece (3) which is connected at the respective ends (3.1) thereof to the respective upper section (2.4) of the backrest lateral parts (2); a lower backrest crosspiece (4) which is connected at the respective ends (4.1) thereof to the respective lower section (2.5) of the backrest lateral parts (2); wherein the backrest lateral parts (2) have a through-opening (5) in the lower section (2.5) and the lower sections (2.5) of the two profiles (2.1, 2.2) are designed in such a way that they are in contact in a contact region (6) surrounding the through-opening (5) at least in sections, characterised in that, in the connected state, the two profiles (2.1, 2.2) form a hollow space (11) surrounding the contact region (6) at least in sections.

Description

Backrest for a seat

Technical Field

The invention relates to a backrest for a seat, in particular for a vehicle front dersitz.

Technical Background (Background Art)

Seats in the vehicle, especially the front seats of the vehicle, are subject to a wide variety of requirements, which must be taken into account during development and are in conflict relationship with one another in terms of low costs, low weight, small installation space and high crash safety. Driven by the desire for more comfort for rear passengers, the focus is increasingly on the space requirement. Usually, an open shell design is used in the backrests of vehicle seats, especially in the backrest side parts, cf. for example US 9 132 760 B2 and US 9 227 271 B2, wel che to increase the installation space, in particular the legroom, but cannot be made narrower without this measure being at the expense of crash safety and / or weight.

Closed profiles can provide an improvement, cf. for example DE 10 201 1 003 574 A1 and DE 10 2009 025 780 A1. A generic vehicle seat is disclosed in the laid-open specification JP 2016 150 657 A, for example. However, there is a need for further optimization in relation to the state of the art.

Summary of the invention

The invention is based on the object of providing a backrest for a seat, in particular a vehicle front seat, which meets the various requirements mentioned above.

This object is achieved by a backrest for a seat with the features of patent claim 1. Further advantageous embodiments of the invention are listed in the subordinate claims. According to the invention, a backrest for a seat, in particular for a vehicle front dersitz is provided which

two backrest side parts, which are each formed from two cohesively connected profiles, an inner profile and an outer profile, wherein they have a varying cross-section in their longitudinal extent at least in sections, an upper backrest cross member, which at its ends with the respective upper section of the Backrest side panels are connected,

a lower backrest cross member which is connected at its ends to the lower section of the backrest side parts,

the backrest side parts have a through opening at their lower section and the two profiles are designed at their lower section in such a way that they are in contact in a contact area surrounding the through opening at least in some areas, the two profiles in the interconnected state at least partially around the contact area form surrounding cavity.

The inventors have found that when the two profiles are connected to one another, form a cavity surrounding the contact area at least in sections, in particular a cavity completely surrounding the contact area, the inner profile and the outer profile at least in some areas in the lower section in their que extension can each have a substantially W-shaped cross-section, the Le henseitenteile can be made narrower in their transverse extent, since through the cavity surrounding the contact area in the lower section, the interconnected NEN profiles can be made particularly rigid, so that the backrest side parts on a required minimum in the transverse extent in the lower section and thereby gained in particular special space and weight can be reduced by saving material. The shape or geometry of the profiles can have an individually positive influence on the needs and / or requirements. The lower section of the backrest side parts comprises at least the contact area and extends (in the installed state) from the bottom to a maximum of one third based on the maximum length of the backrest side part or parts. In particular, the lower section extends up to a quarter, preferably up to a fifth, based on the maximum longitudinal extension of the backrest side part or parts. The inner and the outer profile are advantageously connected to one another at least in sections, in particular in the lower section in an overlap, preferably welded to one another. In particular, the inner and the outer profile are advantageously connected to one another at least in sections, in particular in the upper section in the butt joint or overlap, preferably welded to one another.

The inner and outer profiles are preferably formed from sheet metal blanks, preferably from a steel material, in particular with a tensile strength of at least 600 MPa, for example by means of deep drawing, in particular with a material thickness between 0.6 and 1.5 mm each.

The backrest side parts have a through opening on their lower section, the two profiles being in contact in a contact area that at least partially surrounds the through opening. The contact in the contact surrounding the through opening, at least regionally, preferably complete, leads to a particularly rigid and / or twist-resistant design of the backrest side parts. Due to the at least regionally, preferably complete, material doubling in the contact area surrounding the through opening, according to one embodiment, a particularly stable and torsionally rigid connection or connection to an adjusting mechanism is possible. The adjustment mechanism is preferably connected in a connectable manner by means of laser welding, so that a material connection between the adjustment mechanism and the inner and outer profile is implemented. Alternatively or cumulatively, the inner and / or outer profile of the backrest side part can have corresponding embossments, via which the profiles can be in contact with one another, in particular in sections, and in particular can also be connected with one another to further increase the stability in the contact area.

According to one embodiment, the backrest side parts are designed as an open connection area at their upper section, in particular at the end of the upper section. The inner and outer profiles are preferably shaped in such a way that, in the connected state, the open connection area has an essentially round cross section, in particular a circular cross section. Advantageously, the cross section of the profile of the backrest side part varies along its longitudinal extent and can change in the transverse extent from an in particular essentially w-shaped cross section in the lower section to a substantially round, in particular semicircular cross section in the upper section. According to one embodiment, the upper backrest cross member is designed as a tube. Pipes can be mass-produced inexpensively. The backrest cross member is preferably received in the open connection area of the backrest side parts or is slipped over the open connection area so that a particularly stable backrest can be provided. The backrest cross member is preferably bent in a U-shape. As a result, the ends of the backrest cross-member run in the direction of the longitudinal extension of the backrest side parts, in particular essentially essentially coaxial therewith, whereby a dimensionally accurate assembly can be guaranteed.

The upper backrest cross member is preferably made of a steel material, in particular with a tensile strength between 300 and 500 MPa, in particular with a material thickness between 0.6 and 1.5 mm.

According to one embodiment, at least two passage openings are provided in the upper backrest cross member. In an advantageous manner, sleeves can be received or received in the through openings in the upper backrest cross member. These are used to record and attach or fix a headrest.

According to one embodiment, the lower backrest cross member is designed as a half-shell. Half-shells can be manufactured inexpensively, in particular by means of deep drawing or roll profiling. The backrest cross-member preferably has ends with a larger cross-section than the remaining section. In particular, the cross-section of the end of the backrest cross member on the geometry of the end of the lower section of the backrest sides is partially designed in such a way that the end of the backrest cross member receives the end of the backrest sides in a form-fitting manner or surrounds it and can be connected or tied with a material fit, preferably by laser welding. The larger cross section at the end of the backrest cross member can be produced, for example, in the course of the molding or subsequently after the molding by expanding.

The lower backrest cross member is preferably made of a steel material, in particular with a tensile strength between 300 and 500 MPa, in particular with a material thickness between 0.6 and 1.5 mm.

In order to further increase the bending and / or torsional rigidity in particular, according to one embodiment, the inner and outer profile have bevels in the lower section, which at least in sections (to the outside) of the cavity surrounding the contact area limit, wherein the folds are each provided with at least one notch and the notches are inserted into one another in the connected state of the profiles in such a way that they cause a change in the folds in the overlap. Viewed in the circumferential direction along the folds of the two profiles delimiting the cavity, this measure results in a change in the overlap, i.e. the fold on the outside of one profile up to the notch is on the inside after the notch and the one previously on the inside up to the notch Folding of the other profile after the notch is thus outside. This change in the overlap can improve the torsional rigidity of the backrest side part.

Brief description of the drawings

The invention is explained in more detail below with reference to drawings. The same parts are always provided with the same reference symbols. Show in detail:

Fig. 1) an exploded view of an example of a backrest according to the invention,

Fig. 2) the backrest shown in Fig. 1 in the assembled state in a perspective view,

Fig. 3) an example of a vehicle front seat with the backrest shown in Fig. 2 in the assembled state in a perspective view Fig. 4 is an example of a side rest part in a side view,

Fig. 5 is a sectional view along the line A-A in Fig. 4,

Fig. 6 is a sectional view taken along the line B-B in Figs

Fig. 7 the lower portion of the side rest part from Fig. 4 in perspective Dar position.

Description of the preferred embodiments

FIG. 1 shows an exploded view of an example of a backrest according to the invention (1) for a seat. The backrest (1) for a seat, in particular for a vehicle front seat (10), comprises two backrest side parts (2) which are each formed from two profiles (2.1, 2.2), an upper backrest crossbar (3) and a lower backrest crossbar (4 ).

In Figure 2, the backrest (1) shown in Fig. 1 is shown in the assembled state in a perspective view. The backrest side parts (2), which each consist of two cohesively connected profiles (2.1, 2.2), an inner profile (2.1) and one outer profile (2.2), are formed, have in their longitudinal extension (L) at least partially a varying cross section. The inner and outer profiles (2.1, 2.2) are advantageously welded to one another at least in sections, in particular in the lower section (2.5), in an overlap, cf. also FIGS. 5 to 7. In particular, the inner and outer profiles (2.1, 2.2) are advantageously welded to one another at least in sections, in particular in the upper section (2.4), butt joint or overlap. The inner and the outer profile (2.1, 2.2) are preferably formed from sheet metal blanks made of a steel material, for example by means of deep drawing.

In an advantageous embodiment, the inner profile (2.1) and the outer profile (2.2) each have an essentially W-shaped cross section in their transverse extension (Q), at least in some areas in the lower section (2.5). The backrest side parts (2) formed or constructed from the profiles (2.1, 2.2) have a through opening (5) at their lower section (2.5), the two profiles (2.1, 2.2) in one at least the through opening (5) be in contact with the surrounding contact area (6). The backrest side parts (2) are formed at their upper section (2.4), in particular at the end of the upper section (2.4), as an open connection area (2.6).

The upper backrest cross member (3) of the backrest (1) is preferably designed as a tube and consists of a steel material. The backrest cross member (3) is in particular bent in a U-shape and is received in the open connection area (2.6) of the backrest side parts (2) or slipped over the open connection area (2.6) (not shown). Thus, the upper backrest cross member (3) can be connected with its ends (3.1) to the respective upper section (2.4) of the backrest side parts (2), in particular integrally, preferably welded. In the upper backrest cross member (3) at least two through openings (3.2) are provided, in which preferably sleeves (3.3) can be received or received. The sleeves (3) are used to receive and fasten or fix a headrest (9).

The lower backrest cross member (4) of the backrest (1) is preferably made as a half-shell and consists of a steel material. At its ends (4.1) the Lehnenquertra verse (4) is connected to the respective lower section (2.5) of the backrest side parts (2). The ends (4.1) of the backrest cross-member (4) have a larger cross-section than the rest of the section, the ends (4.1) encompassing the ends of the lower sections (2.5) of the backrest side parts (2) in a form-fitting manner and integrally connected, preferably to be welded. In Figure 3, an example of a vehicle front seat (10) is shown in the assembled state in a perspective view. The backrest (1) essentially corresponds to the example shown in FIG. The connection between the backrest (1) and a seat part (8) of the vehicle front seat (10) is made via an adjustment mechanism (7) which can be attached or tied to the surrounding contact area (6) of the through openings (5) at least in sections, in particular by means of laser welding connectable or connected. The adjustment mechanism (7) comprises an upper recliner receptacle (7.1), which can be or is connected to the backrest side part (2), and a lower recliner receptacle (7.2) which is connected to the seat part (8) or a frame of the seat part (8 ) connectable or verbun, the upper and lower recliner mounts (7.1, 7.2) being rotatably coupled to one another via a rotatable adjustment mechanism (7.3) so that the backrest (1) can be angularly adjusted to the seat part (8). Not shown here, the inner profile (2.1) and the outer profile (2.2) in the area of the connection to the adjustment mechanism (7) can have a material doubling, which enables the backrest (1) to be welded directly to the adjustment mechanism ( 7) to be welded. The upper cliner receptacle (7.1) can be omitted.

If the vehicle front seat (10) is used in a vehicle (not shown), the transverse extension (Q) of the backrest side parts (2) run essentially in the X direction and the longitudinal extension (L) of the backrest side parts (2) essentially in the Z direction of the vehicle, especially when the backrest (1) is in an upright position (normal Sitzpo position).

In Figure 4, an example of a backrest side part (2) is shown in side view. It is easy to see that the lower section (2.5) includes at least the contact area (6) and extends from below up to a maximum of a third, in particular up to a maximum of a quarter, preferably up to a maximum of a fifth along the longitudinal extension (L) of the backrest side part (2) extends. 5 and 6 are sectional views along the lines AA and BB ge shows, the inner profile (2.1) and the outer profile (2.2) in the contact area (6), which preferably completely surrounds the through opening (5), a material doubling aufwei sen, which can advantageously be used to connect, in particular to weld on, an adjusting mechanism (7). To increase the flexural and torsional stiffness of the backrest side part, the two profiles (2.1, 2.2) are designed in particular in such a way that, when connected, they form a cavity (1 1) surrounding at least some sections of the contact area (6). Furthermore, the inner profile (2.1) and the outer profile (2.2) in particular in the lower section (2.5) of the backrest side part (2) connected to one another in an overlap.

FIG. 7 shows a perspective view of the lower section (2.5) of the backrest side part (2) from FIG. 2. It can be seen that the inner profile (2.1) and the outer profile (2.2) in the lower section (2.5) have bends ( 2.11, 2.21), which at least partially delimit the cavity (11) surrounding the contact area (6) to the outside, where the bevels (2.11, 2.21) each with at least one notch (2.12, 2.22) are provided and the Notches (2.12, 2.22) in the connected state of the profiles (2.1, 2.2) are plugged into one another in such a way that they cause the folds (2.11, 2.21) to overlap. Viewed in the circumferential direction along the folds (2.11, 2.21) of the two profiles (2.1, 2.2) delimiting the cavity (11), the fold (2.21) of the outer profile (2.2) lies on the outside and after the notch up to the notch (2.22) (2.22) on the inside and the bevel (2.11) of the inner profile (2.1) lying on the inside up to the notch (2.12) after the notch (2.12) thus outside.

The invention is not limited to the embodiments shown, but the individual features can be combined with one another as desired. Particularly preferably, the vehicle front seat (10) can be used as a driver and / or passenger seat in passenger vehicles, commercial vehicles, trucks, special vehicles, buses, omnibuses, whether with hybrid or purely electric drive.

List of reference symbols

1 backrest

2 backrest side part

2.1, 2.2 inner, outer profile

2.11, 2.21 folding inner, outer profile

2.12, 2.22 notch inner, outer profile

2.4, 2.5 upper, lower section

2.6 open connection area in the upper section

3 upper backrest cross member

3.1 End, ends of the upper backrest cross member

3.2 passage opening

3.3 sleeve

4 lower backrest crossbar

4.1 End, ends of the lower backrest cross member 5 through opening

6 Area surrounding the passage opening 7 Adjustment mechanism

7.1, 7.2 upper, lower recliner mount

7.3 rotatable adjustment mechanism

8 seat part

9 headrest

10 vehicle front seat

1 1 cavity

L longitudinal extension

Q transverse extension

Claims

1. Backrest (1) for a seat, in particular for a vehicle front seat (10), comprehensive send

- Two backrest side parts (2), which are each formed from two cohesively connected profiles (2.1, 2.2), an inner profile (2.1) and an outer profile (2.2), ge, wherein they are in their longitudinal extension (L) at least partially have a varying cross-section,

an upper backrest cross member (3) which is connected at its ends (3.1) to the respective upper section (2.4) of the backrest side parts (2),

a lower backrest cross member (4) which is connected at its ends (4.1) to the lower section (2.5) of the backrest side parts (2),

the backrest side parts (2) have a through opening (5) at their lower section (2.5) and the two profiles (2.1, 2.2) are formed at their lower section (2.5) in such a way that they at least partially in one of the through opening (5) the surrounding contact area (6) are in contact,

characterized in that

the two profiles (2.1, 2.2) in the interconnected state form a cavity (11) surrounding at least some sections around the contact area (6).

2. Backrest according to claim 1, wherein an adjusting mechanism (7) can be attached or connected, in particular connected or connected by means of laser welding, to the surrounding contact area (6) of the through openings (5) at least in sections.

3. Backrest according to one of the preceding claims, wherein the backrest side parts (2) are designed as an open connection area (2.6) at their upper section (2.4), in particular at the end of the upper section (2.4).

4. Backrest according to one of the preceding claims, wherein the upper Lehnenquertra verse (3) is designed as a tube.

5. Backrest according to one of the preceding claims, wherein the backrest cross member (3) is received in the open connection area (2.6) of the backrest side parts (2) or is slipped over the open connection area (2.6).

6. Backrest according to one of the preceding claims, wherein in the upper backrest cross traverse (3) at least two through openings (3.2) are provided.

7. Backrest according to claim 6, wherein sleeves (3.3) can be received or received in the through openings (3.2).

8. Backrest according to one of the preceding claims, wherein the lower Lehnenquertra verse (4) is designed as a half-shell.

9. Backrest according to claim 8, wherein the backrest cross member (4) has ends (4.1) with a larger cross-section than the remaining section.

10. Backrest according to one of the preceding claims, wherein the inner and / or äu ßere profile (2.1, 2.2) of the backrest side part (2) aufwei sen corresponding embossments, through which the profiles (2.1, 2.2) are in particular in contact with each other.

1 1. Backrest according to one of the preceding claims, wherein the inner and the outer profile (2.1, 2.2) in the lower section (2.5) have bevels (2.11, 2.21) which at least in sections form the cavity (1) surrounding the contact area (6) 1), the folds (2.11, 2.21) each being provided with at least one notch (2.12, 2.22) and the notches (2.12, 2.22) being plugged into one another when the profiles (2.1, 2.2) are connected in such a way that they change the folds (2.11, 2.21) cause the overlap.