DE102008011753B4 - Vehicle with at least one pivoting vehicle door - Google Patents

Abstract

Vehicle, with at least one vehicle door (2) pivotably mounted on the vehicle body (1), which in turn is carried by a single pivot arm (4) which absorbs all door forces and which in turn is pivotally mounted at one end by means of a pivot bearing (5) on the vehicle body (1) and at the other end by means of a pivot bearing (6) on the vehicle door (2) about a vertical axis, wherein the door-side pivot bearing (6) of the pivot arm (4) is arranged in a middle section of the vehicle door (2), viewed over the length of the latter, and wherein the pivot arm (4) is formed by a horizontally oriented arm part (4a) with a body-side and a door-side bearing part, characterized in that the bearing parts are each formed by a vertically oriented bearing pin (4b, 4c), wherein the body-side bearing pin (4b) has two free ends, which are each received by a body-side bearing bush (5a, 5b), whereas the door-side bearing pin (4c) has a free end which is received by a door-side bearing bush (6a), and that the door-side pivot bearing (6) of the pivot arm (4) is arranged in the center of gravity of the vehicle door (2), but at least close to it.

Description

The invention relates to a vehicle with at least one pivotable vehicle door according to the preamble of claim 1 of the invention.

Vehicle doors, especially on motor vehicles, are known in a wide variety of designs. DE 24 12 936 A1 A motor vehicle sliding door suspended at three points is known, which, in an extended position, is guided parallel to the vehicle side wall and for this purpose has a central sliding door fitting in the form of a pivoting U-shaped bracket on its rear edge. The U-shaped bracket is pivotally attached to the door via one leg in a hinge-like deflection and pivotally suspended via the other leg by means of bearing bushes designed as a collar bush in a bearing bore parallel to the vehicle side wall in the chassis of a roller carriage running in a guide rail attached to the vehicle side wall. DE 10 2004 050 229 A1 further discloses a side door for a motor vehicle, which is arranged on a vehicle side wall via a bow hinge having two pivot axes. The bow hinge is pivotally mounted on the vehicle side wall in the area of one pivot axis and on the other hand in the area of the other pivot axis at the level of the window opening and close to the front edge of the side door, whereby the side door can be opened outwards parallel to the vehicle outer wall during an opening process. Furthermore, said side door is displaceable in the longitudinal direction of the vehicle along at least one guide rail arranged on or in the inside of the door. Both solutions have in common that the hinges are subject to considerable loads due to the weight of the doors and accordingly, corresponding stabilizing measures are required, such as additional hinges ( DE 24 12 936 A1 ) and/or a particularly stable design of a single hinge used ( DE 10 2004 050 229 A1 ).

From the DE 199 58 746 B4 A pivoting door for a vehicle is known, the door leaf of which is mounted on a pivot arm by means of a door pivot joint. A pivoting column, mounted vertically in the vehicle and rotatable by a drive, to which the pivot arm is attached, pivots the door leaf from a closed position to an open position by means of this pivot arm. This publication is silent on the specific connection of the pivoting column to the vehicle body.

From the US 3 158 395 A A vehicle door is known which is connected to the vehicle body by means of a hinge arrangement with a plate-shaped arm part and with two hinges arranged at each end thereof with a common vertical pivot axis and is guided by means of a driver head in a guide slot of the vehicle body in such a way that the vehicle door follows a predetermined movement pattern to open it and moves laterally outwards and slightly forwards.

From the US 4 632 447 A A side door of a vehicle with a hinge mechanism is known, which comprises a front support arm and a rear wishbone. The support arm and the wishbone are hinged at one end and spaced apart from each other by means of a pivot joint to a front pillar of the vehicle body. The other end of the support arm is hinged to a front end of the vehicle door by means of a pivot joint, while the wishbone is hinged to the vehicle door centrally in the area of an armrest by means of a pivot joint.

Based on this, it is the object of the invention to provide a vehicle with a further improved pivoting vehicle door which, in view of the state of the art, requires in particular less effort for the pivoting bearing of the vehicle door while minimizing the necessary free space for pivoting the vehicle door and ensuring the best possible passage through the door cutout of the vehicle body.

Starting from a vehicle with at least one vehicle door pivotally mounted on the vehicle body, which in turn is carried by a single pivot arm which absorbs all door forces and which in turn is pivotally mounted at one end by means of a pivot bearing on the vehicle body and at the other end by means of a pivot bearing on the vehicle door about a vertical axis, wherein the door-side pivot bearing of the pivot arm is arranged in a middle section of the vehicle door, viewed over the length of the same, and wherein the pivot arm is formed by a horizontally aligned arm part with a body-side and a door-side bearing part, the stated object is achieved in that the bearing parts are each formed by a vertically aligned bearing pin, wherein the body-side bearing pin has two free ends, which are each received by a body-side bearing bush, whereas the door-side bearing pin has a free end which is received by a door-side bearing bush, and in that the door-side pivot bearing of the pivot arm is in the center of gravity the vehicle door, or at least close to it.

This measure advantageously minimizes the forces acting on the door-side pivot bearing, in particular tilting moments, which results in lower expenditures with regard to the stability and strength of the vehicle door itself and in particular in the area of said door-side pivot bearing.

The subclaims describe preferred developments or embodiments of the invention.

Advantageously, it can be provided that the door-side pivot bearing of the vehicle door is height-adjustable. Advantageously, the arm part of the pivot arm has a longitudinal extension "s" such that when the vehicle door is fully pivoted, the door cutout in the vehicle body is largely exposed over its entire circumference. Further advantageously, the pivot arm can be designed to be telescopic, wherein said telescoping can be achieved mechanically, hydraulically, pneumatically, or electromechanically. The door-side bearing bush can be formed by a bushing base body, which in turn, according to a first preferred embodiment, can be fastened to a rigid support part of the vehicle door by means of fastening means. The support part can expediently be formed by reinforcing plates, which in turn, when assembled, form a vertically aligned hollow profile with a closed cross-section. This measure allows the fastening point for the bushing base body on the support part to be height-adjustable, resulting in convenient assembly and adjustment of the vehicle door with respect to the vehicle body. As further provided by the invention, the door-side bearing pin can be axially fixed but rotatably connected to the door-side bearing bushing by means of a fixing pin, which in turn penetrates a vertically aligned through-bore of the door-side bearing pin and is supported at one end on the same and at the other end on the door-side bearing bushing. According to a further preferred embodiment of the invention, the door-side bearing bushing can also be designed as part of a sliding guide arranged on the vehicle door. It is further proposed that the arm part of the pivot arm be arranged in or near a horizontal plane determined by an adjacent sill of the vehicle body. Furthermore, the arm part of the pivot arm can be straight or curved, viewed in the pivot plane thereof. Furthermore, the pivot arm can be designed as a welded, cast, or formed part and can be made of metal, such as steel or light metal, or of a plastic, such as a fiber-reinforced plastic (CFRP or the like). The vehicle door can also be manually and/or externally operated. As the invention further provides, each pivot bearing can be assigned at least one actuator known per se that effects the pivoting movement of the pivot arm and the vehicle door supported by it, which actuators, in turn, are interconnected and coordinated in terms of control technology in such a way that a pivoting movement of the vehicle door is permitted with the minimum required lateral clearance. Said actuators can be hydraulic, pneumatic, and/or electromechanical. The vehicle door described above can be designed as a side door or as a rear door. A vehicle door in the form of a rear door can be pivotally hinged laterally to the vehicle body and designed to be pivotable in such a way that, in the fully opened state, it is guided around a body corner and nestles against the relevant body side wall.

The proposed vehicle with a pivoting door offers the following key advantages over conventional door systems. First, minimal lateral space is required to open the vehicle door. Furthermore, the free space created in the sill area and the wide-opening vehicle door allow for improved entry. Finally, the largely concealed support and guidance of the vehicle door exclusively at the bottom allows for considerable design freedom, and this type of door system also permits the installation of coupe-style vehicles.

• 1 die Seitenansicht einer Rohbau-Fahrzeugkarosserie, im Bereich der Beifahrerseite eines Kraftfahrzeugs zum besseren Verständnis in einer vergleichenden Darstellung sowohl mit einer erfindungsgemäß ausgebildeten als auch mit einer herkömmlichen schwenkbaren Fahrzeugtür,
• 2 die Draufsicht nach 1,
• 3 die erfindungsgemäß von einem Schwenkarm getragene Fahrzeugtür nach 1 in einer Seitenansicht von außen im geschlossenen Zustand,
• 4 ein Schwenkarm in einer perspektivischen Einzelteilansicht als eine Systemkomponente der schwenkbaren Fahrzeugtür,
• 5 die karosserieseitige Schwenklagerung des Schwenkarms nach 4 (Schnitt I-I nach 3),
• 6 die türseitige Schwenklagerung des Schwenkarms nach 4 (Schnitt II-II nach 3),
• 7 den Schnitt III-III nach 3,
• 8 eine Parallelführung in einer perspektivischen Einzelteilansicht als weitere Systemkomponente der schwenkbaren Fahrzeugtür, und
• 9 die schematische Darstellung der Schwenkkinematik der vom Schwenkarm getragenen Fahrzeugtür in Abhängigkeit von der Ausrichtung eines benachbarten Fahrzeugrades.

The invention is explained in more detail below with reference to an embodiment schematically illustrated in the drawings. In the drawings:

• 1 the side view of a vehicle body shell, in the area of the passenger side of a motor vehicle for better understanding in a comparative representation with both an inventively designed and a conventional pivoting vehicle door,
• 2 the top view 1 ,
• 3 the vehicle door supported by a swivel arm according to the invention 1 in a side view from the outside in the closed state,
• 4 a pivot arm in a perspective detail view as a system component of the pivoting vehicle door,
• 5 the body-side swivel bearing of the swivel arm according to 4 (Section II after 3 ),
• 6 the door-side pivot bearing of the pivot arm according to 4 (Section II-II after 3 ),
• 7 the section III-III after 3 ,
• 8 a parallel guide in a perspective individual part view as a further system component of the pivoting vehicle door, and
• 9 the schematic representation of the pivoting kinematics of the vehicle door carried by the pivoting arm depending on the orientation of an adjacent vehicle wheel.

The 1 and 2 First, they show a shell 1 of a motor vehicle, in this case a passenger car, in the area of the passenger side of the vehicle. For better understanding, both a pivoting vehicle door 2, 2' designed according to the invention and a conventional one are shown in the open state, with the conventional vehicle door 2' being indicated by dashed lines.

This comparative illustration shows the main advantage of the vehicle door 2 designed according to the invention compared to a conventional vehicle door 2' pivoted on one side, which in turn is characterized by an extremely minimized required free space for pivoting the vehicle door 2, in that the same can be pivoted largely parallel to the vehicle body 1 out of a door cutout 3 of the same or into the door cutout 3.

Such a pivoting movement is essentially realized by a single pivot arm 4 which supports the vehicle door 2 and absorbs all occurring door forces and which is pivotally mounted at one end on the vehicle body 1 and at the other end on the vehicle door 2 in pivot bearings 5, 6 about a vertical axis each.

According to the 3 and 4 The pivot arm 4 is formed by a largely horizontally oriented arm part 4a with a bearing part arranged at each end thereof in the form of a largely vertically oriented bearing pin 4b, 4c, which in turn are received by at least one bearing bush 5a, 5b; 6a arranged on the body or door side. The pivot arm 4 can be designed as a welded, cast, or formed part and can be made of metal, such as steel or light metal, or of plastic, such as a fiber-reinforced plastic. A suitable fiber-reinforced plastic, for example, is CFRP (=carbon fiber reinforced plastic) or the like.

Preferably, two bearing bushes 5a, 5b are provided on the body side, which are arranged according to the 3 , 4 and 5 the ends of the body-side bearing pin 4b of the swivel arm 4, which is designed with two free ends, are supported both radially and axially.

In contrast, the door-side bearing pin 4c according to this embodiment has only one free end, which supports a single door-side bearing bush 6a both radially and axially.

In the present case, the door-side bearing bush 6a is formed by a bushing base body, which in turn can be fastened to a rigid support part 8 of the vehicle door 2 by means of fastening means 7, such as pins, screws or the like ( 6 and 7 ).

Said rigid support part 8 is formed by reinforcing plates 8a, 8b of the vehicle door 2, which in turn form a vertically aligned hollow profile with a closed cross-section when assembled, which in turn is supported on any impact beams 9 and/or the inner door panel 10 of the vehicle door 2 (in particular 3 ).

As already shown above, this measure allows the fastening point for the bushing base body of the bearing bush 6a on the support part 8 to be adjusted in height, resulting in a comfortable assembly and adjustment of the vehicle door 2 in relation to the motor vehicle body 1 or its door opening 3.

For fixing the door-side bearing pin 4c in the door-side bearing bush 6a, a fixing pin 11 is provided, which in turn penetrates a vertically aligned through-bore 12 of the door-side bearing pin 4c and is supported at one end on the same and at the other end on the door-side bearing bush 6a and is thus axially fixed but rotatably connected to the door-side bearing bush 6a.

As in particular the 2 and 3 As can be seen further, the door-side pivot bearing 6 of the pivot arm 4 is arranged in a middle section of the vehicle door 2, viewed along the length of the same, preferably in, but at least close to, the center of gravity of the vehicle door 2. As a result, the forces acting on the door-side pivot bearing 6, in particular tilting moments, are significantly minimized.

As will certainly be easily understood by the expert, the maximum door cutout 3 to be exposed by the vehicle door 2 during the opening process can be adjusted by selecting the longitudinal extension “s” of the arm part 4a of the pivoting arm 4.

Preferably, however, the arm part 4a of the pivot arm 4 has a longitudinal extension “s” such that when the vehicle door 2 is pivoted out completely, the door cutout 3 in the motor vehicle body 1 is largely fully exposed, thereby allowing comfortable entry or exit and/or comfortable loading or unloading.

If, on the other hand, the maximum longitudinal extent “s” of the arm part 4a of the pivot arm 4 is limited due to, for example, certain construction conditions, it is advisable to design the door-side bearing bush 6a as part of a sliding guide arranged on the vehicle door 2, which, after the vehicle door 2 has been pivoted out to its maximum, allows subsequent longitudinal displacement of the same along a guide guide assigned to the vehicle door 2 (not shown in more detail).

Likewise, the swivel arm 4 can be telescopically moved by means of mechanically, hydraulically, pneumatically or electromechanically operated actuating means known per se and not shown in detail (arrow 23 according to 9 ), whereby a guidance of the vehicle door 2 during the opening and closing process of the same is permitted which deviates from a conventional circular path and is further optimised with regard to the desired smallest possible lateral clearance required.

As in particular the 3 As can be seen further, the vehicle door 2 is further assigned a forced guide in the form of a mechanical parallel guide 13 corresponding to the pivot arm 4, which in turn ensures a collision-free door position with respect to the vehicle body 1.

Said parallel guide 13 is also designed, in accordance with the swivel arm 4, with a possibly telescopic guide arm 13a and end-side bearing pins 13b, 13c, which in turn are supported via bearing bushes 14a, 14b; 15 and via an associated connecting means 16 on the motor vehicle body 1 or via a connecting means 17 on the vehicle door 2 ( 8 ).

Preferably, both the pivot arm 4 or its arm part 4a and the parallel guide 13 or its guide arm 13a are arranged in or near a horizontal plane determined by an adjacent sill 18 of the motor vehicle body 1, thereby avoiding a disruptive influence thereof when getting in and out or loading and unloading.

9 shows, very schematically, the pivoting kinematics of the vehicle door 2 carried by the pivot arm 4, with the vehicle door 2 being shown in several operating positions. During the pivoting movement, the vehicle door 2 moves along a circular path or, if the pivot arm 4 and guide arm 13a are telescopic, along a different path, but maintains its conventional parallel position to the vehicle body 1.

As from 9 As can be seen further, the arm part 4a of the swivel arm 4 can, contrary to the straight designs according to the 2 , 3 and 4 can also be curved when viewed in the pivoting plane, which allows for improved adaptation to specific installation conditions.

In extensive tests, it has proven advantageous to arrange door handles of the vehicle door 2 (not shown in detail here) preferably above the center of gravity of the same in order to minimize as far as possible adverse tilting moments acting on the door-side pivot bearing 6, in particular during a manual opening or closing process.

In addition to manual actuation of the vehicle door 2, actuation by external means, for example by means of hydraulic or pneumatic cylinders known per se or also electromechanically, is also conceivable and is accordingly included in the invention (not shown in detail).

As regards, in particular, vehicle doors 2 in the form of side doors which are designed to be pivotable according to the invention, it has proven expedient in the context of said tests to move the steerable vehicle wheels 19, in particular front wheels, into a position before opening the vehicle door 2 such that no hindrance to the opening process of the vehicle door 2 is caused.

As from 9 As can be seen, due to the envelope curve 20 described by the vehicle wheel 19 or its tire in the pivoted-out state of the vehicle wheel 19, an obstruction of the opening process of the vehicle door 2 by pivoting forwards could not be avoided.

In order to counteract this circumstance, at least one door opening sensor 21 is assigned to the vehicle door 2, which in turn is connected to an electronic control and regulating device - ECU - which in turn is connected to one or more means 22 which are suitable for pivoting the vehicle wheel(s) 19 in such a way that said obstruction is not present, by the vehicle wheels 19, for example, being positioned in a straight-ahead position or in such a slight inclined position, which allows collision-free opening of the vehicle door 2.

The electric motor of an existing, known electromechanical power steering system, which can also function as a parking assistant, is advantageously used as the means 22 for pivoting the vehicle wheels 19. Other suitable, known devices, such as hydraulically or pneumatically actuated devices for pivoting the vehicle wheels 19, are certainly also conceivable and are therefore also encompassed by the invention.

Furthermore, said door opening sensor 21 can be connected via the electronic control and regulating device - ECU - to one or more means suitable for transferring the vehicle body 1 to a favorable height level when the vehicle door 2 is operated for comfortable entry and exit from the vehicle as well as for loading and unloading the vehicle, for example with the aid of a wheel suspension known per se with spring and/or damper adjustment, which can be carried out electromechanically, hydraulically or pneumatically, to raise the vehicle body 1 and lower it back to normal level at least at the beginning of the vehicle's journey (not shown in detail).

Furthermore, it may also prove advantageous in this context, and is also encompassed by the invention, when the vehicle door 2 is operated, to automatically, preferably electromechanically, move an exterior mirror (not shown in detail here but known per se) adjacent to the vehicle door 2 at least from a folded-out position to a folded-in position, thereby further minimizing the clearance required for pivoting a front vehicle door 2 (not shown in detail). In preparation for a journey, i.e., after the vehicle door 2 has been closed, the exterior mirror is expediently moved back into its original folded-out operating position, preferably similarly sensor-controlled.

The same may also apply to any additional extendable running board provided on high-rise vehicles, which can be moved automatically, i.e., sensor-controlled, hydraulically, pneumatically or electromechanically, from a retracted position to an extended position and back again when the vehicle door 2 is operated (not shown in detail).

The above embodiment is based on a pivot arm 4 with a mechanical parallel guide 13. According to a further embodiment, not shown in detail here but easily understandable for those skilled in the art, and avoiding the aforementioned parallel guide 13, each pivot bearing 5, 6 is assigned at least one actuator known per se that effects the pivoting movement of the pivot arm 4 and the vehicle door 2 supported thereby. These actuators, in turn, are then interconnected and coordinated in terms of control and regulation technology in such a way that a pivoting movement of the vehicle door 2 is permitted with the minimum required lateral clearance. Said actuators can be hydraulic, pneumatic, and/or electromechanical.

Furthermore, the above embodiments are based on a side door of a vehicle/motor vehicle. However, the invention is not limited to said side door, but also encompasses a rear door (not shown in detail), which can be suspended or hinged to the side of the vehicle body 1 and can be operated.

The vehicle door 2 or rear door is expediently designed to pivot so that, when fully opened, it is guided around a corner of the body and closely hugs the relevant body side panel. This allows the rear door to pivot up to approximately 90° around the body's vertical axis.

list of reference symbols

1

vehicle body

2

Vehicle door (according to the invention)

2'

Vehicle door (conventional)

3

Door cutout

4

swivel arm

4a

armrest

4b

Bearing bolt (body side)

4c

Bearing bolt (door side)

5

Swivel bearing (body side)

5a

bearing bush

5b

bearing bush

6

Swivel bearing (door side)

6a

bearing bush

7

Fasteners

8

carrier part

8a

Reinforcing plate

8b

Reinforcing plate

9

Impact beam

10

inner door panel

11

Fixing bolt

12

through hole

13

Parallel guidance

13a

guide arm

13b

bearing bolt

13c

bearing bolt

14a

bearing bush

14b

bearing bush

15

bearing bush

16

Connection devices

17

Connection devices

18

sills

19

vehicle wheel

20

Envelope (vehicle wheel 19)

21

Door opening sensor

22

Means for pivoting (vehicle wheel 19)

23

Telescoping (swivel arm 4)

Claims (20)

Vehicle, with at least one vehicle door (2) pivotably mounted on the vehicle body (1), which in turn is carried by a single pivot arm (4) which absorbs all door forces and which in turn is pivotally mounted at one end by means of a pivot bearing (5) on the vehicle body (1) and at the other end by means of a pivot bearing (6) on the vehicle door (2) about a vertical axis, wherein the door-side pivot bearing (6) of the pivot arm (4) is arranged in a middle section of the vehicle door (2), viewed over the length of the latter, and wherein the pivot arm (4) is formed by a horizontally oriented arm part (4a) with a body-side and a door-side bearing part, characterized in that the bearing parts are each formed by a vertically oriented bearing pin (4b, 4c), wherein the body-side bearing pin (4b) has two free ends, which are each received by a body-side bearing bush (5a, 5b), whereas the door-side bearing pin (4c) has a free end which is received by a door-side bearing bush (6a), and that the door-side pivot bearing (6) of the pivot arm (4) is arranged in the center of gravity of the vehicle door (2), but at least close to it. Vehicle to Claim 1 , characterized in that the door-side pivot bearing (6) of the vehicle door (2) is adjustable in height. Vehicle to Claim 1 or 2 , characterized in that the arm part (4a) of the pivot arm (4) has a longitudinal extension “s” such that when the vehicle door (2) is pivoted completely, the door cutout in the vehicle body (1) is fully exposed. Vehicle according to one of the preceding claims, characterized in that the swivel arm (4) is designed to be telescopic. Vehicle to Claim 4 , characterized in that said telescoping of the swivel arm (4) is accomplished mechanically, hydraulically, pneumatically or electromechanically. Vehicle according to one of the preceding claims, characterized in that the door-side bearing bush (6a) is formed by a bush base body which in turn can be fastened to a rigid support part (8) of the vehicle door (2) by means of fastening means (7). Vehicle to Claim 6 , characterized in that the support part (8) is formed by reinforcing plates (8a, 8b) which, when assembled, form a vertically aligned hollow profile with a closed cross-section. Vehicle to Claim 6 or 7 , characterized in that the fastening point for the socket base body on the support part (8) is adjustable in height. Vehicle according to one of the preceding claims, characterized in that the door-side bearing pin (4c) is connected axially fixedly but rotatably to the door-side bearing bush (6a) by means of a fixing pin (11), which in turn penetrates a vertically aligned through-bore (12) of the door-side bearing pin (4c) and is supported at one end on the same and at the other end on the door-side bearing bush (6a). Vehicle according to one of the preceding claims, characterized in that the door-side bearing bush (6a) is part of a sliding guide arranged on the vehicle door (2). Vehicle according to one of the preceding claims, characterized in that the arm part (4a) of the pivot arm (4) is arranged in or near a horizontal plane determined by an adjacent sill (18) of the vehicle body (1). Vehicle according to one of the preceding claims, characterized in that the arm part (4a) of the pivot arm (4) is designed to be straight or curved when viewed in the pivot plane thereof. Vehicle according to one of the preceding claims, characterized in that the pivot arm (4) is designed as a welded, cast or formed part. Vehicle according to one of the preceding claims, characterized in that the pivot arm (4) consists of metal, such as steel or light metal, or of a plastic, such as a fiber-reinforced plastic (CFRP or the like). Vehicle according to one of the preceding claims, characterized in that the vehicle door (2) can be operated manually and/or by external means. Vehicle according to one of the preceding claims, characterized in that each pivot bearing (5, 6) is assigned at least one actuator which effects the pivoting movement of the pivot arm (4) and the vehicle door (2) carried by it, which actuators are in turn interconnected and coordinated in terms of regulation and control technology in such a way that a pivoting movement of the vehicle door (2) is permitted with the smallest required lateral clearance. Vehicle to Claim 16 , characterized in that the actuators are of hydraulic, pneumatic and/or electromechanical type. Vehicle according to one of the preceding claims, characterized in that the vehicle door (2) is a side or rear door. Vehicle according to one of the preceding claims, characterized in that a vehicle door (2) in the form of a rear door is pivotally attached to the side of the vehicle body (1). Vehicle to Claim 19 , characterized in that the rear door is designed to be pivotable in such a way that, in the maximum open state, it is guided around a corner of the body and nestles against the relevant side wall of the body.

Images