DE102011003119B4 - Vehicle seat with torsion bar spring arranged in a cross tube - Google Patents

Abstract

Vehicle seat, with
- a seat frame,
an adjustment part which can be pivoted to the seat frame,
- A arranged on the seat frame, extending along a transverse direction cross tube, which is rotatably connected to the adjusting part and pivotally connected to the seat frame, and
- A torsion bar spring which extends at least in sections in the cross tube for prestressing the adjustment part relative to the seat frame, a first end of the torsion bar spring being held in a rotationally fixed manner on the cross tube and a second end of the torsion bar spring on the seat frame, and the cross tube being a spring bearing molded into the cross tube for rotationally fixed Holding the first end of the torsion bar spring on the cross tube, characterized in that the adjusting part (6a) is attached to the cross tube (102) in the region of the spring bearing (3) and the cross tube (102) on the spring bearing (3) to reinforce the Cross tube (102) in the area of the spring bearing (3) at least partially encompasses around.

Description

The invention relates to a vehicle seat according to the preamble of claim 1.

Such a vehicle seat has a seat frame, an adjustment part which can be pivoted to the seat frame, a cross tube arranged on the seat frame and extending along a transverse direction, which is connected in a rotationally fixed manner to the adjustment part and pivotably connected to the seat frame, and a torsion bar spring which extends at least in sections in the cross tube for biasing the adjustment part relative to the seat frame. The seat frame can, for example, be part of a seat part of the vehicle seat which serves as a seat surface for a vehicle occupant, while the adjustment part can be formed, for example, by a backrest which can be pivoted to the seat frame or by a rocker arm pivotably mounted to the seat frame for height adjustment of the vehicle seat.

The cross tube is fixed to the adjustment part, e.g. connected to the backrest or the swing arm and pivoted to the seat frame.

The torsion bar spring serves to pretension the adjustment part against the seat frame. If the adjustment part is formed by a backrest of the vehicle seat, the torsion bar spring can be designed, for example, and can be operatively connected to the seat frame on the one hand and the backrest on the other hand, so that when the backrest is swung forward from a normal operational position, the backrest can be set up from the to support the deflected, swiveled position back to the normal use position. If the adjustment part is formed by a rocker for adjusting the height of the vehicle seat, the torsion bar spring can, for example, be designed and operatively connected to the seat frame on the one hand and the rocker on the other hand so that it is tensioned when the rocker is moved relative to the seat frame to transfer the vehicle seat into a lowered position is pivoted to support the lifting of the vehicle seat from the lowered position.

For this purpose, a first end of the torsion bar spring is held on the cross tube in a rotationally fixed manner and a second end of the torsion bar spring is held on the seat frame. The first end of the torsion bar is thus held on the cross tube in a rotationally fixed manner, while the second end of the torsion bar is connected to the seat frame which can be pivoted relative to the cross tube. If the cross tube is pivoted relative to the seat frame from a position in which the torsion bar spring is relaxed or only comparatively slightly pretensioned, the torsion bar spring, which is supported with its other, second end, on the seat frame, about its axis, along which it extends in the cross tube, rotated and thus tensioned, so that a pivoting back of the cross tube relative to the seat frame takes place in a spring-assisted manner.

In order to arrange the first end of the torsion bar in a rotationally fixed manner on the cross tube, the cross tube is conventionally formed at one end by stamping, so that a spring bearing is created for the first end of the torsion bar, in which the torsion bar spring can be held in a rotationally fixed manner. For this purpose, the first end of the torsion bar spring is cranked and is inserted into the receptacle on the cross tube and held in a form-fitting manner on the cross tube in the inserted state.

With one from the DE 100 28 897 A1 Known vehicle seat, for example, a compensation element is arranged in the manner of a torsion bar spring stressed in torsion in a cross tube and is positively held at one end on an indentation on the cross tube.

A disadvantage of such a fastening of the torsion bar spring to the cross tube can be that the torsional rigidity and the pressure rigidity of the cross tube is reduced, in particular in the event of a rear impact or a side impact, since there is a weakening of material in particular at the point of reshaping (embossing) to form the spring bearing , For this reason, comparatively large wall thicknesses or tube diameters must be provided for the cross tube in order to adapt the vehicle seat to the requirements with regard to transverse rigidity, natural frequency and crash safety.

However, this is a problem if the vehicle seat is to be optimized for a lightweight construction with a view to its weight. A cross tube with a large diameter and thin wall thickness can be used, which also meets the strength requirements. However, if the material thickness of the tube wall is chosen too small, the bead-like deformations in the cross tube in the area of the spring bearing may be expressed locally by the high forces introduced by the torsion bar spring. (It should be noted here that the torsion bar spring is designed to absorb and provide very large torsional forces and can be shaped, for example, as a wire with a diameter of several millimeters, for example 8 mm. It therefore requires large torsional forces in order to twist the torsion bar spring and with the torsion bar spring must be held on the cross tube in accordance with high strength.)

With one from the DE 199 61 655 A1 Known vehicle seat extends a torsion bar spring, which is not guided in a cross tube, between two frame parts and is held on the frame parts via bearing bushes.

With one from the DE 15 05 735 A Known vehicle seat, a torsion bar spring is attached centrally to a cross tube fixed to the vehicle floor and is pivotally connected at its ends to the cross tube with the handlebars of the vehicle seat.

The WO 2007/049463 A1 describes a vehicle seat with a seat frame and an adjustment part which can be pivoted relative to the latter and a cross tube with a torsion bar spring arranged therein.

The object of the present invention is to provide a vehicle seat with a torsion bar spring arranged in a cross tube for biasing an adjustment part relative to a seat frame, which allows a simple, inexpensive construction of the cross tube with a torsion bar spring arranged thereon with high strength and the possibility of a lightweight construction ,

This object is achieved by an object with the features of claim 1.

Accordingly, the adjustment part is attached to the cross tube in the area of the spring bearing and encompasses the cross tube on the spring bearing to reinforce the cross tube in the area of the spring bearing, at least in sections.

The present invention is based on the idea of conventionally using a spring bearing which is molded into an otherwise preferably circular-cylindrical cross tube and holds the first end of the torsion bar in a rotationally fixed manner. In order to be able to use a cross tube with a comparatively thin wall thickness and in this way to reduce the weight of the cross tube, it is provided that the adjustment part is attached to the cross tube in the area of the spring bearing. The cross tube is to be reinforced in the area of the spring bearing by the adjusting part, so that the cross tube on the spring bearing can absorb and dissipate the forces introduced by the torsion bar spring without the spring forces acting to cause an expression, i.e. a change in shape, of the cross tube in the area of the spring bearing , can come.

By means of the adjustment part, which can be formed, for example, by a rocker arm of a height adjustment of the vehicle seat, the cross tube is selectively reinforced in the area of the spring bearing. The adjustment part thus reinforces the cross tube at the point at which the cross tube must absorb and support the large forces exerted by the torsion bar spring, so that the cross tube is light overall, i.e. can be formed with a comparatively thin wall thickness. In the sense of a synergetic double use, the adjustment part thus serves on the one hand as a component to be adjusted that can be pivoted to the seat frame, and on the other hand to reinforce the cross tube in the area of the spring bearing.

The cross tube deviates from a circular cylindrical shape at least at the section on which the spring bearing is arranged. Although the cross tube can in principle also have a different shape, for example an oval cross-sectional shape, the cross tube is preferably circular-cylindrical in sections outside the spring bearing. The spring bearing is then integrally molded into the otherwise circular-cylindrical cross tube by an embossing and, due to the embossing, deviates from the otherwise circular-cylindrical shape in the other sections of the cross tube. The spring bearing is shaped by the embossing in such a way that a receptacle for the first end of the torsion bar spring is created for the rotationally fixed, form-fitting arrangement of the torsion bar spring on the cross tube. Due to the embossing, the cross-section in the area of the spring bearing is reduced in its cross-sectional area (in cross section perpendicular to the transverse direction along which the cross pipe extends) compared to the cross-sectional area at the other sections.

The spring bearing advantageously has two contact sections molded into the cross tube, at least in sections extending parallel to one another, at which the first end of the torsion bar spring on the inside of the cross tube, i.e. on the inner wall of the cross tube designed as a hollow tube, and between which the first end of the torsion bar spring is held in a rotationally fixed manner. By means of the contact sections, the first end of the torsion bar spring, which can be bent for advantageous, non-rotatable support, that is to say bent at the end, is held in a form-fitting manner on the cross tube in such a way that the first end cannot be rotated relative to the cross tube.

The adjustment part advantageously lies on the outside of the cross tube against these contact sections and is connected, in particular welded, to the cross tube via the contact sections, so that the adjustment part supports and reinforces the contact sections from the outside. The adjustment part engages circumferentially (i.e. in the circumferential direction around the transverse direction along which the cross tube extends) at least in sections around the cross tube in the area of the spring bearing and is in contact with the two mutually parallel contact sections so that one over the first end of the torsion bar spring on the system sections exerted force is supported by the adjusting part.

For this purpose, the adjustment part, which can be designed, for example, as a rocker for a height adjustment, can advantageously have a receptacle at a first end, on which the cross tube is arranged.

In a specific embodiment, this receptacle can be formed by two fastening webs which extend approximately parallel to one another from a base part of the adjustment part, which is designed, for example, as a swing arm of a height adjustment, and hold the cross tube with the spring bearing between them. The fastening webs form a receptacle in the manner of a fork, between the fastening webs of which the spring bearing of the cross tube is inserted and supported in a form-fitting manner. The spring bearing is supported on the outside via the fastening webs, so that the cross tube in the area of the spring bearing can also absorb large forces introduced by the torsion bar spring.

If the adjustment part is formed by a rocker arm of a height adjustment of the vehicle seat, it is sufficiently strong for carrying the vehicle seat and for deriving the load forces acting on a vehicle seat during use and, for this purpose, is made of sheet steel, for example. The sufficient strength of this adjustment part is now also used in synergetic double use to support the cross tube in the area of the spring bearing, in that the adjustment part with the fastening webs engages around the spring bearing and supports it on the outside, so that the cross tube in the area of the spring bearing is pressed out through onto the contact sections forces exerted on the first end of the torsion bar spring are prevented.

The base part of the adjustment part extends approximately along an extension direction and in an extension plane essentially perpendicular to the transverse direction along which the cross tube extends. The fastening webs arranged on the base part for forming the receptacle on the adjustment part advantageously do not extend in a straight line parallel to the direction of extension of the base part, but are arranged in an oblique manner to the base part.

The fastening webs can describe a first oblique angle to the direction of extension of the base part of the adjusting part, if one considers the projection of the fastening webs on the extension plane of the base part. In other words, if one looks at the extension plane of the adjustment part in a side view, the fastening webs are arranged obliquely in the extension plane at the first angle to the direction of extension of the base part.

In addition, if the projection of the fastening webs is viewed on a plane perpendicular to the plane of extension and parallel to the direction of extension, the fastening webs can describe a second oblique angle to the direction of extension. The fastening webs can thus, when looking in a plan view of a plane perpendicular to the plane of extension and parallel to the direction of extension, be angled by the second angle out of the plane of extension to the direction of extension.

The oblique orientation of the fastening webs can thus be described by two oblique angles: a first oblique angle in the plane of extension of the base part and a second oblique angle out of the plane of extension of the base part. The first oblique angle and / or the second oblique angle can be between 30 ° and 60 °, preferably between 40 ° and 50 °, e.g. 45 °.

Due to the oblique orientation of the fastening webs to the base part, it is possible to arrange the adjustment part, which is designed, for example, as a rocker arm, in the desired angular position with respect to the spring bearing of the cross tube and, in addition, to extend the length over which the fastening webs bear against the contact sections of the spring bearing, so that a improved support can be created. In addition, the length increases over which weld seams can be attached along the fastening webs for the fixed connection of the adjusting part to the contact sections of the spring tube.

• 1 eine schematische Ansicht eines Fahrzeugsitzes;
• 2 eine schematische, perspektivische Ansicht eines Sitzrahmens eines Fahrzeugsitzes, der über Schwingen höhenverstellbar an einem Fahrzeugboden angeordnet ist;
• 3 eine schematische Schnittansicht eines an dem Sitzrahmen angeordneten Querrohres, über das Schwingen verschwenkbar mit dem Sitzrahmen verbunden sind und in dem eine Drehstabfeder zum Vorspannen der Schwingen gegenüber dem Sitzrahmen angeordnet ist;
• 4 eine perspektivische Ansicht eines Ausführungsbeispiels einer an einem Querrohr angeordneten Schwinge, die das Querrohr im Bereich eines Federlagers zum drehfesten Halten einer Drehstabfeder zumindest abschnittsweise umgreift;
• 5 eine teilweise schematische, vergrößerte Ansicht der Schwinge an dem Querrohr;
• 6 eine Ansicht - gesehen in das Querrohr hinein - eines ersten Endes der Drehstabfeder an dem Federlager des Querrohres;
• 7 eine teiltransparente Ansicht der Schwinge an dem Federlager des Querrohres;
• 8 eine schematische Seitenansicht der Schwinge, betrachtet in einer Erstreckungsebene, in der sich ein Basisteil der Schwinge erstreckt, und
• 9 eine Draufsicht auf die Schwinge, betrachtet in einer Ebene senkrecht zu der Erstreckungsebene des Basisteils der Schwinge und parallel zu einer Erstreckungsrichtung des Basisteils.

The idea on which the invention is based will be explained in more detail below with reference to the exemplary embodiments illustrated in the figures. Show it:

• 1 a schematic view of a vehicle seat;
• 2 is a schematic, perspective view of a seat frame of a vehicle seat, which is arranged on a vehicle floor adjustable in height by swinging;
• 3 is a schematic sectional view of a cross tube arranged on the seat frame, pivotally connected to the seat frame via the rockers and in which a torsion bar spring is arranged for biasing the rockers relative to the seat frame;
• 4 a perspective view of an embodiment of a swing arm arranged on a cross tube, the cross tube in Region of a spring bearing for holding a torsion bar spring in a torque-proof manner at least in sections;
• 5 a partially schematic, enlarged view of the rocker on the cross tube;
• 6 a view - seen into the cross tube - of a first end of the torsion bar on the spring bearing of the cross tube;
• 7 a partially transparent view of the rocker on the spring bearing of the cross tube;
• 8th is a schematic side view of the rocker, viewed in an extension plane in which a base part of the rocker extends, and
• 9 a plan view of the rocker, viewed in a plane perpendicular to the plane of extension of the base part of the rocker and parallel to an extension direction of the base part.

1 shows a schematic view of a vehicle seat 1 , in the case of a seat frame providing a seat part 10 a backrest 11 is pivotally arranged. The vehicle seat 1 is over articulated with the seat frame 10 connected swing 6a . 6b . 7a . 7b with a vehicle floor 5 connected, with the height adjustment of the vehicle seat 1 the wings 6a . 6b . 7a . 7b relative to the seat frame 10 can be pivoted and thereby the seat height of the vehicle seat 1 relative to the vehicle floor 5 can be adjusted.

2 shows the seat frame 10 of the vehicle seat 1 with the rockers articulated on it 6a . 6b . 7a . 7b in a schematic-perspective view. The seat frame 10 has side frame parts 100 . 101 on which is a frame structure of the seat frame 10 train and on which, for example, a seat cushion to provide the seat part for the vehicle seat 1 is arranged.

Between the frame parts 100 . 101 extends along a transverse direction L a cross tube 102 over which the rear wings 6a . 6b pivotable with the seat frame 10 are connected. The rear wings 6a . 6b are firmly attached to the cross tube 102 connected, for example welded, and the cross tube 102 is pivotable to the frame parts 100 . 101 of the seat frame 10 stored so that by pivoting the cross tube 102 along with the rear wings 6a . 6b while simultaneously swinging the front wings 7a . 7b the seat height of the vehicle seat 1 can be adjusted. For this purpose, a height adjustment device can be provided in a manner known per se, for example via a on the seat frame 10 arranged drive device on a dental arch on one of the rear wings 6a . 6b for swiveling the rear wings 6a . 6b relative to the seat frame 10 acts.

In which there is between the frame parts 100 . 101 extending cross tube 102 is how out 2 and 3 evident, a torsion bar spring 2 arranged, which is inside the cross tube 102 extends longitudinally and with a cranked, first end 21 (please refer 3 ) via a spring bearing 3 in the area of a first end 102 of the cross tube 102 with the cross tube 102 connected and via a guide part 4 from a second end 102b of the cross tube 102 is brought out.

The torsion bar spring 2 serves to pretension the wings 6a . 6b opposite the seat frame 10 , The torsion bar spring 2 is about this with its first end 21 non-rotatable on the cross tube 102 held and with its second end 22 on which it is bent over a holding element 107 on the frame part 101 of the seat frame 10 supported.

The torsion bar spring 2 can in this case in the cross tube 102 be arranged so that it is relaxed or only slightly biased when the vehicle seat 1 is in a raised position. Used to lower the vehicle seat 1 the cross tube 102 with the wings attached to it 6a . 6b relative to the seat frame 10 swiveled and the seat frame 10 thus the vehicle floor 5 approximated, the cross tube pivots 102 relative to the seat frame 10 , being the first end 21 the torsion bar spring 2 about the spring bearing 3 non-rotatable on the cross tube 102 and the second end 22 the torsion bar spring 2 via the holding element 107 on the seat frame 10 is held so that the torsion bar spring 2 by pivoting the cross tube 102 relative to the seat frame 10 loaded and twisted on torsion and consequently tensioned. In the lowered position of the seat frame 10 is the torsion bar spring 2 cocked so that lifting the seat frame 10 can be done from the lowered position in a spring-assisted manner.

The torsion bar spring 2 is about the spring bearing 3 with the cross tube 102 connected. The first end 21 the torsion bar spring 2 is in the spring bearing 3 positive and non-rotatable against rotation around the transverse direction L relative to the cross tube 102 kept, the cross tube 102 as a circular cylindrical tube with circular cylindrical sections 102c . 102d is executed, the spring bearing 3 however, through embossing in the cross tube 102 is molded and the cross tube 102 thus in the area of the spring bearing 3 deviates from the circular cylindrical shape.

How from 3 the cross tube is visible 102 over its ends 102 . 102b swiveling on the frame parts 100 . 101 of the seat frame 10 stored. The spring bearing 3 is in the area of the first end 102 of the cross tube 102 attached by embossing it into the wall of the cross tube 102 is molded. The spring bearing 3 is therefore in one piece with the cross tube 102 shaped. Additional components for the formation of the spring bearing 3 on the cross tube 102 are not required.

On the cross tube 102 are two adjustment parts in the form of the rear swing arm 6a . 6b attached and attached for example by welding. One of those wings 6a . 6b , namely the first end 102 of the cross tube 102 assigned swing arm 6a is in the area of the spring bearing 3 on the cross tube 102 arranged and encompasses, in the sense of the present invention, the cross tube 102 on the spring bearing 3 to reinforce the cross tube 102 in the area of the spring bearing 3 at least in sections circumferentially, that is in the circumferential direction around the transverse direction L along which the cross tube 102 extends.

4 to 9 show a specific embodiment of an arrangement in which a torsion bar 2 with a first ending 21 on a spring bearing 3 a cross tube 102 is arranged. The torsion bar spring 2 is in the area of its first end 21 cranked, ie bent so that the first end 21 rotatably on the spring bearing 3 of the cross tube 102 can be held and when the torsion bar is loaded 2 on torsion through the support via the spring bearing 3 not in relation to the cross tube 102 is twisted.

In the area of the spring bearing 3 is an adjustable part in the form of a swing arm 6a the height adjustment of the vehicle seat 1 on the cross tube 102 attached.

How from 4 . 5 . 7 and 8th visible, the swing arm points 6a a base part 61 on that a recording at one end 62 , essentially formed by fastening webs 620 . 621 , and a deposit at its other end 60 having. Over the fastening webs 620 . 621 the recording 62 is the swing arm 6a with the cross tube 102 connected. About the depository 60 is the swing arm 6a pivotable with a guide rail 50 (please refer 5 ) a longitudinal adjustment device of the vehicle seat 1 connected via which the vehicle seat 1 longitudinally displaceable on the vehicle floor in a manner known per se 5 (please refer 1 ) is arranged.

As especially according to the view 6 - seen in the cross tube 102 inside - you can see the spring bearing 3 formed by two sections 30 . 31 by stamping into the wall of the cross tube 102 are molded in (see also 5 ). The investment sections 30 . 31 serve on the one hand to support the first end 21 the torsion bar spring 2 so that the torsion bar spring 2 with their first end 21 rotatably on the spring bearing 3 of the cross tube 102 is held, and on the other hand for attaching and connecting the rocker 6a over the attachment bars 620 . 621 the recording 62 ,

How from 6 visible, the first end is in the assembled state 21 the torsion bar spring 2 with end sections 210 . 211 (see also 7 ) at support points 300 . 310 inside the system sections 30 . 31 on. These support points 300 . 310 extend linearly along the contact sections 30 . 310 parallel to the transverse direction L , according to the shape of the system sections 30 . 31 and the end sections 210 . 211 of the first end 21 the torsion bar spring 2 ,

The torsion bar spring 2 is in the assembled state under prestress in the cross tube 102 one and is about it in the 6 shown position on the inside in contact with the contact sections 30 . 31 held. In an initial state, which is a raised position of the seat frame 10 of the vehicle seat 1 corresponds, this preload is comparatively small and serves the first end 21 without play on the spring bearing 3 of the cross tube 102 to keep. Will the vehicle seat 1 with the seat frame 10 lowered from this initial state and the cross tube 102 together with the wings attached to it 6a . 6b opposite the seat frame 10 pivoted, so the torsion bar 2 excited by the first end 21 the torsion bar spring 2 on the spring bearing 3 of the cross tube 102 held and the second end 22 (please refer 3 ) the torsion bar spring 2 on the seat frame 10 is supported and by pivoting the cross tube 102 with the torsion bar spring arranged in it 2 relative to the seat frame 10 the torsion bar spring 2 is loaded and twisted on torsion. Now the seat frame 10 raised from a lowered position and the cross tube 102 pivoted in the opposite direction, the lifting takes place in a spring-assisted manner by the torsion bar spring 2 at least partially relaxed and a torque on the cross tube 102 in the direction of lifting the vehicle seat 1 exercises.

Due to the load on the torsion bar spring 2 the spring bearing must be in torsion 3 the one about the first end 21 the torsion bar spring 2 into the cross tube 102 Support the spring forces introduced. Around the cross tube 102 in the area of the spring bearing 3 to strengthen and deflect the spring forces acting, the rocker engages 6a with the fastening bars 620 . 621 the recording 62 at the plant sections 30 . 31 of the spring bearing 3 on and encompasses these on the outside, so that on the contact sections 30 . 31 acting spring forces in the fastening webs 620 . 621 can be initiated and derived.

Through the fastening webs 620 . 621 that are fixed to the attachment sections 30 . 31 connected, in particular along the fastening webs 620 . 621 attached welds are welded, is the cross tube 102 in the area of the spring bearing 3 reinforced in sections, so that in this way an expression of the spring bearing 3 is counteracted locally due to the acting spring forces.

Overall, the additional support of the cross tube enables 102 in the area of the spring bearing 3 over the swing arm 6a the cross tube 102 with thin walls and therefore lightweight, using the swing arm 6a and the attachment bars attached to it 620 . 621 on the spring bearing 3 acting spring forces are supported and absorbed where they occur.

The swingarm 6a serves in synergetic double use on the one hand for the height adjustment of the vehicle seat 1 for height-adjustable connection of the seat frame 10 with the vehicle floor 5 and on the other hand for local reinforcement of the cross tube 102 in the area of the spring bearing 3 ,

The attachment bars 620 . 621 the recording 62 are oblique to the base part 61 the swingarm 6a directed as from the perspective views according to 4 . 5 and 7 and from the schematic views according to 8th and 9 can be seen. The base part 61 the swingarm 6a extends essentially in one extension plane e corresponding to the drawing plane of the view 8th corresponds and perpendicular to the drawing plane according to the view 9 runs, and the fastening webs 620 . 621 extend obliquely to the base part 61 , with the orientation of the mounting webs 620 . 621 through two angles α . β can be described.

On the one hand there are the fastening webs 620 . 621 when you project the mounting bars 620 . 621 to the extension level e , according to the drawing level according to 8th , viewed at an oblique, acute angle α to the direction of extension L1 of the base part 61 directed. That angle α can be, for example, between 30 ° and 60 °, in particular between 40 ° and 50 °.

At the same time, the fastening webs 620 . 621 through a second oblique angle β also from the extension level e out how in 9 is shown. The drawing level of the 9 corresponds to a plane perpendicular to the extension plane e and parallel to the direction of extension L1 of the base part 61 , In this level, the attachment webs describe 620 . 621 if you project them into this plane, an angle β to the direction of extension L1 , which can also be between 30 ° and 60 °, in particular between 40 ° and 50 °.

Due to the oblique alignment of the fastening webs 620 , 621 to the base part 61 that is essentially perpendicular to the transverse direction L extends, the swing arm becomes possible 6a in the desired angular position to the cross tube 102 to arrange. This is achieved by angling the fastening webs 620 . 621 to the base part 61 around the first angle α ,

At the same time, by bending the fastening webs 620 . 621 around the angle β from the extension level e of the base part 61 out the mounting bars 620 . 621 obliquely to the transverse direction L arranged so that the fastening webs 620 . 621 at an angle to the system sections 30 . 31 of the spring bearing 3 run like in particular 4 and 5 can be seen. Due to this oblique arrangement of the fastening webs 620 . 621 becomes the effective length over which the mounting bars 620 . 621 the plant sections 30 . 31 support, extended. At the same time, support is provided not only at an axial point, but over a larger axial distance along the transverse direction L in the area of the spring bearing 3 reached. As a further effect, the length increases over the weld seams along the fastening webs 620 . 621 for attaching the swing arm 6a on the cross tube 102 can be attached.

The reinforcing support of the cross tube in the area of its spring bearing by the adjustment part makes it possible to design the cross tube overall with a comparatively thin wall thickness and thus easily, the cross tube being supported and reinforced via the adjustment part where large spring forces are arranged in the cross tube during operation Torsion bar spring must be taken up and derived.

In another embodiment, the adjustment part can also be part of a backrest which is attached to the cross tube and is biased against the seat frame via a corresponding torsion bar spring.

LIST OF REFERENCE NUMBERS

1

vehicle seat

10

seat frame

100, 101

frame part

102

cross tube

102a, 102b

The End

102c, 102d

Circular cylindrical section

107

retaining element

11

backrest

2

Torsion bar

21.22

The End

210, 211

end

3

spring camp

30.31

contact section

300, 310

support point

4

guide part

5

vehicle floor

50

guide rail

6a, 6b

Adjustment part (rear swing arm)

60

depository

61

base

62

admission

620, 621

fastening web

7a, 7b

Front swingarm

α, β

angle

L

transversely

L1

extension direction

e

extension plane

Claims (12)

Vehicle seat, with - a seat frame, - an adjustment part pivotable to the seat frame, - a cross tube arranged on the seat frame and extending along a transverse direction, which is rotatably connected to the adjustment part and pivotably connected to the seat frame, and - one at least in sections in the Transverse tube extending torsion bar for biasing the adjusting part against the seat frame, wherein a first end of the torsion bar is rotatably held on the cross tube and a second end of the torsion bar on the seat frame and the cross tube is a spring bearing molded into the cross tube for rotationally holding the first end of the torsion bar has the cross tube, characterized in that the adjusting part (6a) is attached to the cross tube (102) in the region of the spring bearing (3) and the cross tube (102) is attached to the spring bearing (3) for reinforcing the cross tube (102) in the region of the Spring bearing (3) encompasses circumferentially at least in sections. Vehicle seat after Claim 1 , characterized in that the cross tube (102) deviates from a circular cylindrical shape at least at the section on which the spring bearing (3) is arranged. Vehicle seat after Claim 1 or 2 , characterized in that the cross tube (102) in other sections (102c, 102d) than the section on which the spring bearing (3) is arranged is circular-cylindrical and the spring bearing (3) is embossed into the cross tube (102) is molded in one piece and deviates from the circular cylindrical shape in the remaining sections (102c, 102d). Vehicle seat according to one of the Claims 1 to 3 , characterized in that the spring bearing (3) has two contact sections (30, 31) molded into the cross tube (102) and at least partially parallel to one another, at which the first end (21) of the torsion bar spring (2) on the inside of the cross tube (102 ) is present and between which the first end (21) of the torsion bar spring (2) is held in a rotationally fixed manner. Vehicle seat after Claim 4 , characterized in that the adjustment part (6a) lies on the outside of the cross tube (102) on the contact sections (30, 31). Vehicle seat after Claim 4 or 5 , characterized in that the adjusting part (6a) is connected to the cross tube (102) via the contact sections (30, 31). Vehicle seat after Claim 6 , characterized in that the adjustment part (6a) is welded to the cross tube (102) via the contact sections (30, 31). Vehicle seat according to one of the preceding claims, characterized in that the adjusting part (6a) has a receptacle (62) at a first end, on which the cross tube (102) is arranged. Vehicle seat after Claim 8 , characterized in that the receptacle (62) of the adjustment part (6a) is formed by two fastening webs (620, 621) which extend approximately parallel to one another from a base part (61) of the adjustment part (6a) and the cross tube (102) with the spring bearing (3) between you. Vehicle seat after Claim 9 , characterized in that the base part (61) extends along an extension direction (L1) in an extension plane (E) perpendicular to the transverse direction (L) and - the fastening webs (620, 621), if one considers the projection of the fastening webs (620, 621) on the extension plane (E), a first oblique angle (α) to the direction of extension (L1) of the base part (61) of the adjustment part (6a) describe and / or - the fastening webs (620, 621), when looking at the projection of the fastening webs (620, 621) onto a plane perpendicular to the plane of extension (E) and parallel to the direction of extension (L1), to a second oblique angle (β) describe the direction of extension (L1). Vehicle seat after Claim 10 , characterized in that the first oblique angle (α) and / or the second oblique angle (β) are between 30 ° and 60 °. Vehicle seat after Claim 11 , characterized in that the first oblique angle (α) and / or the second oblique angle (β) are between 40 ° and 50 °.

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