DE102018214891A1 - Vehicle body with body shell and vehicle floor as well as a safety structure component - Google Patents

Abstract

A motor vehicle body (10) comprises a surface-coated body shell (12) with a floor support section (16) and a vehicle floor (14) which is separate from the body shell (12) and is firmly connected to the floor support section (16), the vehicle floor (14) comprises a flat, multi-curved, fiber-reinforced plastic comprising floor structure component (24) and at least one floor support (22) connected to the floor structure component (24) with a support material different from the structural material of the floor structure component (24), a support projection (16) of the floor support section (16) 28) protrudes towards the vehicle interior, on which the floor support (22) is supported and to which the floor support (22) is firmly connected by gluing, the motor vehicle body (10) being at least one separate from the body shell (12) as well as at least two legs (26a, 26b; 34a, 34b, 34c; 38a, 38b, 38c) comprising securing structure component (26; 34; 38) which is connected to secure the vehicle floor (14) to the body shell (12) by gluing to the body shell (12) and / or to the floor support (22) The vehicle floor (14) is additionally glued to the body shell (12) by an adhesive seam (50) apart from the securing structure component (26; 34; 38). According to the invention, provision is made for a body body (12) and vehicle floor (14 ) a groove-shaped depression (52) following the course of the adhesive seam (50) is formed, in which there is adhesive material which is connected to the respective other component of body shell (12) and vehicle floor (14).

Description

The present invention relates to a motor vehicle body, comprising a surface-coated body shell with a floor support section and comprising a vehicle floor which is formed separately from the body shell and is firmly connected to the floor support section, the vehicle floor comprising a flat, multi-curved, fiber-reinforced plastic and at least one floor structure component comprising the Floor structure component connected floor support with a different from the structural material of the floor structure component, wherein a support projection protrudes from the floor support section towards the vehicle interior, on which the floor support is supported and with which the floor support is firmly connected by gluing, the vehicle body at least one separately includes both securing body component formed by the body shell and the vehicle floor and comprising at least two legs arranged at an angle to one another, w elches for securing the vehicle floor to the body shell is connected by gluing to the body shell and / or to the floor support, the vehicle floor being additionally glued to the body shell by an adhesive seam apart from the securing structure component.

The present invention also relates to a method for the adhesive connection of a motor vehicle body shell to a vehicle floor.

The surface coating of the body-in-white is usually formed by electrophoretic deposition, as is known from cathodic or anodic dip painting in automotive engineering. This surface coating may no longer be damaged after it has been manufactured.

A vehicle floor with a floor structure component comprising fiber-reinforced plastic does not survive a cathodic or anodic dip coating without damage, depending on the material. The vehicle floor, which can be made with fiber-reinforced plastic, in particular thermoplastic, with low weight and at the same time high rigidity and high environmental resistance, can therefore only be connected to the remaining body shell after it has been dip-coated. It is understandable that only those connection methods can be used for connecting the vehicle floor to the body shell that do not locally attack or destroy the surface coating already produced on the body shell. This provides an adhesive connection between the vehicle floor and the body shell.

In addition, the vehicle floor is physically supported on the support projection of the floor support section of the body shell via the floor support. In order to also give the floor support the necessary stability for this support, the floor support comprises a support material that is different from the structural material of the flat floor structure component. For this purpose, the floor support is also structurally different from the flat floor structure component, for example as a profile material.

When the vehicle floor and body shell are connected by gluing, care must be taken to ensure that loads acting on the vehicle floor during vehicle operation can be introduced into the vehicle floor or the vehicle body along predetermined load paths. Such a load path is predetermined by the floor support with which the floor structure component is adhesively connected.

By using one or more of the securing structure components mentioned at the outset in the motor vehicle body, a load path predetermined by at least one floor support for introducing loads into the vehicle floor can be ensured and the strength of the connection of the vehicle floor to the body shell can be increased. In order not to damage the surface coating already present when the securing structure component is arranged on the body shell or / and on the floor support, the security structure component is glued to the respective component made of body shell and / or floor support.

It is an object of the present invention to further increase the strength of the connection between the body shell and the vehicle floor.

This object is achieved according to an aspect of the device of the present invention by a motor vehicle body of the type mentioned at the outset, in which a groove-shaped depression following the course of the adhesive seam is formed on a component made from the body-in-white and the vehicle floor, in which there is adhesive material which is associated with the respective other component from the body shell and vehicle floor is connected.

When considering a cut in a sectional plane orthogonal to the path of the groove, the adhesive material preferably fills the groove cross section to at least 50% of the cross-sectional area, preferably completely.

Through the groove, the surface wetted by the adhesive material, that is to say the adhesive surface, can be increased, which increases the adhesive effect of the adhesive seam.

The adhesive material thus preferably wets at least one groove flank, preferably both groove flanks, particularly preferably also the groove bottom, so that the adhesive material with the mentioned groove walls: flank and base, can transmit adhesive forces.

The adhesive seam, and with it the groove-shaped depression, is preferably formed all the way round in order to obtain the largest possible adhesive seam length and the largest possible adhesive area through the formation of the groove-shaped depression. The adhesive seam can run in several interrupted sections. For example, it can be interrupted in the area of the at least one floor support. However, the circumferential adhesive seam is preferably designed to be closed circumferential, in order not only to achieve increased bond strength through the adhesive seam, but also a completely circumferential seal formation, which prevents liquid from entering between the vehicle floor and body shell from the outside radially over the adhesive seam into a radially inside the Prevented adhesive area.

In principle, the groove-shaped depression can be formed either in the vehicle floor or in the body shell. The groove-shaped recess is preferably formed in the body-in-white, since this is usually made of metal or another high-strength material compared to the vehicle floor, so that groove walls made from this material can withstand the adhesive forces transmitted to it by the adhesive seam. In addition, in preparation for the adhesive bonding, it is easier to arrange the adhesive material that will later form the adhesive seam on the vehicle floor. The adhesive material is preferably a thermoplastic. Since the vehicle floor also contains thermoplastic materials, the adhesive material can be easily and securely arranged on the vehicle floor as the starting adhesive formation, namely on its side pointing towards the body shell in the fully assembled state. As the starting adhesive formation, the adhesive material preferably protrudes from the side of the vehicle floor that supports it, so that it can be inserted into the groove-shaped depression preferably provided on the red body in preparation for the adhesive bonding as the starting adhesive formation.

Although it is preferred that the adhesive material wet at least one of the groove walls, this is not absolutely necessary if the clear width of the groove-shaped recess decreases in the direction of the groove opening from a groove base remote from a groove opening. Then, after the adhesive material has melted, the adhesive material can be arranged behind the groove opening in the groove-shaped recess, and thus, without transfer of adhesive forces, the vehicle floor can be lifted again from the body shell due to a positive fit of the adhesive material or the adhesive seam with the groove opening continuously or / and gradually tapering groove-shaped depression prevented. In this respect, the adhesive seam can hold the vehicle floor to the body shell even if the adhesive seam does not stick, for example due to unexpected circumstances.

In order to increase the wettable surface, at least one wall of the groove-shaped depression, preferably the groove base that is easily accessible in terms of production technology, can have a shape that deviates from a flat shape. For example, the base of the groove can be knurled or toothed along the course of the groove. As a result of the surface area increased in this way, if the adhesive material adhesively wets the correspondingly structured groove wall, the adhesive effect achieved can be increased.

In order to ensure that the initial adhesive formation arranged in the preparation for the bonding between the body shell and the vehicle floor can be shaped or activated to form an adhesive seam, the vehicle floor can be transparent to a wavelength range of electromagnetic radiation from the side facing away from the body shell along the course of the adhesive seam , which is in the wavelength range from, each including, infrared light to ultraviolet light. Then it is possible to quickly melt the starting position with a laser through the permeable area of the vehicle floor and let it cool down again. As a result of the melting, the groove-shaped depression can be completely filled with adhesive material. If necessary, the initial adhesive formation in the groove depth direction, i.e. measured from the groove opening to the groove base, must have a larger dimension than the groove itself, so that the above-mentioned groove-shaped depression tapering from the groove base to the groove opening can also be completely filled with adhesive material .

• - Bereitstellen eines Fahrzeugbodens mit einer davon abstehenden Bahn aus thermoplastischem Kunststoff auf der im fertig montierten Zustand der Rohkarosse zugewandten Seite,
• - Annähern des Fahrzeugbodens an die Rohkarosse und dabei
• - Einführen wenigstens eines Abschnitts der abstehenden Kunststoffbahn in eine nutförmige Vertiefung in der Rohkarosse,
• - Aufschmelzen der Kunststoffbahn in einen fließfähigen Zustand,
• - Abkühlen und Erstarren lassen des thermoplastischen Kunststoffs der aufgeschmolzenen Kunststoffbahn.

According to a method aspect of the present invention, the above-mentioned object is also achieved by a method for the adhesive connection of a vehicle body shell to a vehicle floor, comprising the following steps:

• Provision of a vehicle floor with a web of thermoplastic material protruding therefrom on the side facing the bodyshell when fully assembled,
• - Approach the vehicle floor to the body shell and thereby
• Inserting at least a portion of the protruding plastic sheet into a groove-shaped recess in the body shell,
• - Melting the plastic sheet into a flowable state,
• - Allow the thermoplastic plastic of the melted plastic sheet to cool and solidify.

To explain the method, reference is made to the above description of the motor vehicle body, which already explains the manufacturing process of the motor vehicle body.

In principle, the plastic sheet can be melted by any energy input, for example also by hot air or inductively on the body shell. Because of the locally high-precision, rapid energy input, however, the melting of the plastic web by laser irradiation is preferred.

The plastic web mentioned in connection with the method is the above-mentioned adhesive starting formation, which exists on an output component, preferably on the vehicle floor, until it is transformed into the adhesive web by the introduction of energy.

Preferred developments of the mechanical connecting elements which are involved in the connection between the vehicle floor and the body shell are described below:

The floor support, which preferably comprises or is a metallic hollow profile, is preferably also surface-coated.

For fastening a vehicle floor to a body-in-white, more than just one securing structure component can advantageously be used in order to increase the connection security and / or connection strength between the vehicle floor and body-in-white. It is also preferable to use more than one securing structure component at one and the same connection point of the vehicle floor with the body shell in order to increase the connection strength and / or connection security at this connection point.

Depending on the application, the securing structure component can have exactly two legs or more than two legs, with two immediately adjacent legs then enclosing an angle with one another.

The two legs, which enclose an angle with one another, need not be flat legs, which are delimited from one another by a sharp bend, although this is preferred. Legs enclosing an angle with one another can also be connected to one another by a curved connecting region between the legs. The securing structure component is preferably a one-piece, monolithic component. It can be made of plastic and / or metal, in particular a metal sheet. A securing structure component made of sheet metal can have at least one section made of folded sheet metal for its stiffening.

Preferred application examples of the fuse structure component mentioned above are shown in detail below:

For example, according to a first embodiment of the present invention, the securing structure component can form the support projection. The advantage of this embodiment is that the support projection on the body shell can only be arranged at a late point in the manufacturing process of a motor vehicle. Thus, the location of the arrangement of the support projection is initially not fixed and can be selected in accordance with the design of the vehicle floor to be connected to the body shell on the body shell. In terms of design, this is achieved in that one leg of the securing structure component is glued to the base support section as a connecting leg and that another leg as the support leg forms the support projection of the base support section. In this case, for example, the securing structure component can have an L-shaped configuration in which exactly two legs are sufficient.

Basically, the connecting leg can be glued to the side of the floor support section of the body shell facing the vehicle floor. Then, however, it may be that the floor structure component and / or the floor support has to be cut out around the connecting leg glued to the floor support section. According to an advantageous development of the present invention, this can be avoided by the support leg passing through an opening in the base support section. The floor support section preferably comprises a section of a side sill and / or a section of a vertical column, which serves to connect the end region of the body shell near the floor to a vehicle stream and / or for later articulation of vehicle doors. The connecting leg can then be glued to the outside of the body-in-white or the floor support section that points away from the vehicle interior of the vehicle formed with the motor vehicle body.

Since sills along the yaw axis of a motor vehicle often have a curved course, the connecting leg can also have a curved shape in order to be as close as possible to be able to enter into a large-area connection with a sill section.

In order to achieve the highest possible rigidity with a low weight at the same time, it is preferred that the floor support comprises a hollow profile, such as a U-profile or a profile with a closed cross-section. In order to achieve effective physical support of the floor support on the support leg and to achieve effective bonding between the support leg and floor support, it is provided according to a preferred development of the present invention that the support leg projects into the hollow profile and overlaps a section of the hollow profile in the direction of insertion and in the thus formed Overlap area is connected to the floor support. In addition to gluing, the floor support can be secured to the support leg by a further fastening means, such as a screw, a rivet or a clip. For this purpose, the support leg can have an insert which is secured to the support leg and which comprises a fastening formation, such as a thread or a rear grip formation for a rivet or a clip. Such an insert is preferably inserted into a corresponding recess on the support leg, which was already formed on the support leg before the surface coating. This recess is preferably not rotationally symmetrical, so that a torque acting on the insert can be supported on the recess surrounding the insert.

In addition or as an alternative to the above-mentioned application of the securing structure component for forming the support projection, one or the securing structure component can be glued to the body shell such that it engages over a securing section of the vehicle floor on the side of the vehicle floor facing away from the support projection. By overlapping the securing section, the securing structural component can form a physical lift-off protection for the vehicle floor against lifting off from the support projection. The securing section of the vehicle floor can be formed by the floor structure component and / or by the floor support. Because of the higher local component strength, it is preferably formed by the floor support.

In terms of construction, the securing structure component can be used as a physical lift-off protection in that one leg of the securing structure component is glued to the floor support section as a fixing leg and that another leg overlaps the securing section of the vehicle floor as a holding leg.

The fixing leg is preferably glued to a vertical column. The vertical columns in a body-in-white often have a roughly U-shaped cross-section orthogonal to their longitudinal axis with two U-legs connected by a central U-base, which project in the same direction from the U-base. The fixing leg is preferably glued to one of the U-legs. The vertical column is particularly preferably a B-pillar, so that the floor support secured in the area of the B-pillar can also serve as a seat support for fastening vehicle seats in the vehicle interior of the vehicle formed from the vehicle body.

For the particularly firm connection of the securing structure component to the base support section, in particular to a vertical column, the body shell, the securing structure component can preferably have three legs, each of which two immediately adjacent legs enclose an angle with one another. Then the holding leg is preferably connected at its two opposite longitudinal ends to a fixing leg, each of which is glued to the base support section, in particular to a vertical column, particularly preferably to a B-column. The holding leg is then between the two fixing legs.

As already explained above, the vertical column preferably has an open cross section, such as the preferred U-profile mentioned above. The securing structure component is therefore preferably connected to a vertical column with an open cross section, and particularly preferably in such a way that the holding leg forms a closed, circumferential cross section in the region of the arrangement of the securing structure component together with the vertical column. In this way, not only physical lifting protection but also local stiffening of the vertical column can be achieved.

According to a further additional or alternative possible application, one or the securing structure component can be glued to the floor support in such a way that it overlaps a doubling section of the floor support. In this way, the wall thickness of the floor support can be increased locally and its attachment to the body shell can be made easier.

The floor support can be a cross member or a longitudinal member, that is to say a support which, in the vehicle formed from the motor vehicle body, runs essentially in the transverse direction of the vehicle (cross member) or in the longitudinal direction of the vehicle (longitudinal member). As a rule, the vehicle floor will have several floor beams, some of which are longitudinal beams and some other cross beams. Each of these floor supports can be secured to the body shell at its longitudinal end region by one or more of the securing structure components mentioned above in the manner described above.

The shelf support is preferably made of metal, in particular sheet metal. The floor structure component can comprise or be an LWRT layer, that is to say a layer made of porous, partially compacted fiber tangle material bound by thermoplastic. The floor structure component preferably also comprises a metal layer, such as an aluminum layer, for example in the thickness range from 0.6 to 1.5 mm. The floor structure component particularly preferably comprises or is a sandwich composite structure with an LWRT layer arranged between two metal layers.

As already described above, the support projection, additionally or alternatively also the securing structure component, can have an insert component, preferably for protecting the plastic surface coating, which has a fastening formation for fastening a fastening component, such as a screw, clip, rivet and the like. This applies above all to the securing structure component, which overlaps a doubling section of the floor support. The insert component, however, can also be implemented in the other described embodiments of a securing structure component.

• 1 eine grobschematische teilgeschnittene Ansicht eines Abschnitts einer erfindungsgemäßen Kfz-Karosserie, welche einen mit einem Bodentragabschnitt einer Rohkarosse verbundenen Fahrzeugboden bei Betrachtung einer zur Querrichtung (Nickachse) des aus der Kfz-Karosserie gebildeten Fahrzeugs orthogonalen Schnittebene I-I in den 2 und 3 zeigt,
• 2 eine grobschematische teilgeschnittene Ansicht der Kfz-Karosserie der 1 und 3 bei Betrachtung einer zur Hochrichtung (Gierachse) des aus der Kfz-Karosserie gebildeten Fahrzeugs orthogonalen Schnittebene II-II in den 1 und 3,
• 3 eine grobschematische teilgeschnittene Ansicht der Kfz-Karosserie der 1 und 2 bei Betrachtung einer zur Längsrichtung (Rollachse) des aus der Kfz-Karosserie gebildeten Fahrzeugs orthogonalen Schnittebene III-III 1 und 2,
• 4 eine grobschematische Draufsicht auf die Kfz-Karosserie mit Rohkarosse und Fahrzeugboden unter Angabe einer umlaufenden Klebenaht zur Verklebung von Rohkarosse und Fahrzeugboden und
• 5 eine grobschematische Schnittansicht durch die Klebenaht von 4.

The present invention will be explained in more detail below with reference to the accompanying drawings. It shows:

• 1 a rough schematic partially sectioned view of a portion of a motor vehicle body according to the invention, which has a vehicle floor connected to a floor support section of a body shell when viewing a transverse plane (pitch axis) of the vehicle body formed from the motor vehicle body II in the 2 and 3 shows,
• 2 a rough schematic partially sectioned view of the vehicle body 1 and 3 when considering a cutting plane orthogonal to the vertical direction (yaw axis) of the vehicle formed from the motor vehicle body II-II in the 1 and 3 .
• 3 a rough schematic partially sectioned view of the vehicle body 1 and 2 when considering a cutting plane orthogonal to the longitudinal direction (roll axis) of the vehicle formed from the motor vehicle body III-III 1 and 2 .
• 4 a rough schematic plan view of the vehicle body with body shell and vehicle floor, specifying a circumferential adhesive seam for gluing body shell and vehicle floor and
• 5 a rough schematic sectional view through the adhesive seam of 4 ,

In the 1 to 3 is an embodiment of a motor vehicle body according to the invention shown in sections and with 10 designated. The car body 10 includes a body shell 12 and a vehicle floor 14 , The body shell 12 is surface coated by cathode dip painting. The surface coating formed in this way may no longer be damaged after its production. The vehicle floor 14 on the other hand does not have such an integrity-sensitive surface coating. He has the body shell painted on the cathode 12 not participated.

A Cartesian coordinate system comprising a roll axis Ro, a pitch axis Ni and a yaw axis Gi des from the vehicle body 10 formed vehicle is for better orientation in the 1 to 3 shown.

From the body shell 12 is a floor support section 16 , comprising a side skirts 18th and a B-pillar 20th , shown. The vehicle floor 14 includes a shelf support 22 and a multi-curved flat floor structure component connected to it 24 which in 1 is shown only in dashed lines around the sections of the base support section lying behind 16 not to cover up. The floor structure component 24 comprises two metal layers of aluminum, not specifically shown in the figures, between which an LWRT material is arranged as a fiber-reinforced plastic layer. The LWRT material is the reason that the floor structure component 24 not like the body shell 12 can be surface coated. The shelf support 22 on the other hand is surface coated, also by cathode dip painting, but was surface coated as a separate component, not together with the body shell 12 , The vehicle floor 14 is one of several floor supports 22 and the flat floor structure component 24 pre-assembled or prefabricated component.

As in 1 is shown as a floor support 22 a square hollow profile selected as an example. On the top side 22a of the floor support 22 is the floor structure component 24 on that in addition with the shelf support 22 is glued. The top face 22a of the floor support running parallel to the pitch axis Ni 22 is longer in this direction than the other side surfaces 22b to 22d ,

The square hollow profile is only chosen as an example. The shelf support 22 could also have a U-hollow profile. Then, for example, that of the upper side surface 22a opposite lower side surface 22b be left out.

A first fuse structure component 26 includes two legs 26a and 26b which enclose an angle with each other. The thigh 26a is here as a connecting leg with the outside, that is from the later vehicle interior one from the vehicle body 10 formed vehicle facing away, the B-pillar 20th glued.

The other leg 26b which of the connecting leg 26a cantilevered is a support leg 26b which has a support tab 28 forms on which the shelf support 22 with its upper side surface 22a lies on. The two immediately opposite each other and along an overlap area 30th overlapping surface sections of the support projection 28 one hand and the upper side surface 22a of the floor support 22 on the other hand, they are connected to one another by gluing.

The support leg 26b penetrates an opening 32 in the floor support section 16 , in the example shown in the transition area between sills 18th and B-pillar 20th , Thus, the connecting leg interferes 26a on the side of the body-in-white that points to the future vehicle interior 12 Not. In addition, the fuse structure component can 26 at almost any location on the body shell 12 be provided, which is an advantageous high level of design freedom in the arrangement of the support projection 28 means.

To further increase the connection strength and security of the connection of the floor support 22 with the bottom support section 16 is in the illustrated embodiment in addition to the first fuse structure component 26 a second fuse structure component 34 as a physical lifting device to secure the floor support 22 before lifting off the support tab 28 provided along the yaw axis Gi.

Unlike the first fuse structural component 26 has the second fuse structure component 34 three legs 34a . 34b and 34c on.

The second fuse structure component 34 is with the floor support section 16 connected by gluing. The in the longitudinal direction of the fuse structure component 34 end leg 34a and 34c form fixing legs 34a and 34c which with respective U-legs 20a and 20c the B-pillar formed from a long profile with a roughly U-shaped cross-section 20th are glued. The one between the fixing legs 34a and 34c lying thighs 34b is a holding leg 34b which has a fuse section 36 of the vehicle floor 14 , more precisely in the exemplary embodiment: the floor support 22 , on which of the tab 28 overlaps the opposite side. The holding leg 34b thus forms a physical barrier, which is a lifting of the floor support 22 and thus the vehicle floor 14 from the lead 28 prevented. To form the securing section is the top side surface 22a longer than the other side surfaces of the floor support, so that the longer side surface 22a in the from the U-profile of the B-pillar 20th surrounding area protrudes.

Where the holding leg 34b in the B-pillar 20th is arranged, it complements the U-shaped cross section of the B-pillar 20th to a closed hollow profile. The B pillar 20th can thus by the fuse structure component 34 additionally be braced locally.

On the in the 1 to 3 Connection point shown a connection of the vehicle floor 14 with the body shell 12 is another, third fuse structural component 38 arranged, which is the local increase in the material thickness of the floor support 22 serves.

The third fuse structure component 38 which like the second fuse structure component 34 has a roughly C-shaped shape, comprises three legs 38a . 38b and 38c , The fuse structure component 38 embraces the shelf support 22 outside on three sides 22a . 22c and 22d along a doubling section 40 , So the shelf support 22 are locally stiffened and / or can have a material thickness which can also be used to fasten a fastening component, such as a screw or clip.

For example, a screw in the support leg 26b To be able to screw in without the possibly surface-coated securing structure component 26 can damage in the fuse structure component 26 a recess 42 , for example a square recess 42 be formed in which an insert component 44 , for example as a plastic insert, with an internal thread formed therein 46 can be arranged as a fastening formation (see only 2 and 3 ). The insert component is preferred 44 into the square recess 42 glued captively.

The insert component 44 is in the embodiment only for illustration on the support leg 26b shown. Such or structurally similar insert component can also be on the securing structural component 34 or and 38 be provided.

In 4 is a rough schematic top view of the body shell 12 with associated vehicle floor 14 shown. The view from 4 under the floor structure component 24 of the vehicle floor 14 lying shelf supports 22 are indicated by dashed lines to link the representation of 4 with the representation of the 1 to 3 to facilitate.

In 4 is a circumferential adhesive seam 50 shown in dashed lines since the adhesive seam 50 in the perspective of 4 under the floor structure component 24 is located.

In 5 is the glued seam 50 roughly schematically represented in a sectional plane orthogonal to its closed course. The cutting plane of 5 is, for example, orthogonal to the roll axis Ro and could therefore take the place of the to the plane of 4 orthogonal plane VV in 4 lie.

The adhesive seam 50 is located in a groove-shaped depression 52 the body shell 12 , which also in 3 can be seen.

In contrast to the detailed representation of the 1 to 3 is in 4 the adhesive seam 50 shown closed all around. However, as in the 1 to 3 , in the area of the floor supports 22 be interrupted.

The groove-shaped depression 52 in the body shell 12 points one to the bottom of the groove 52a parallel width w to be measured, which from the slot opening 52b in the groove depth direction t to the groove base 52a increases. Therefore, the adhesive seam 50 not just adhesive the vehicle floor 14 and in particular the floor structure component 24 on the body shell 12 hold, but also form-fitting. Because the groove-shaped depression 52 fully filling adhesive seam 50 tapers just like the groove-shaped recess 52 even against the groove depth direction t from the bottom of the groove 52a to the slot opening 52b so that the adhesive seam 50 against the groove depth direction t not even from the groove-shaped recess 52 would be liftable if between the adhesive seam 50 and the groove flanks 52c and 52d as well as the groove base 52a no adhesive forces would be transferable.

The adhesive material was originally the adhesive seam 50 as a starting glue formation 50 ' in the form of a plastic sheet with an assumed rectangular cross-section on the fully assembled body shell 12 facing side 24a of the floor structure component 24 with the floor structure component 24 connected.

The floor structure component 24 then became the body shell 52 approximated, whereby during this approach the adhesive starting formation 50 ' from the groove opening 52b out into the groove-shaped recess 52 was introduced. The dimension of the initial adhesive formation 50 ' parallel to the groove depth direction t was greater than the depth of the groove-shaped depression to be measured in the same direction 52 from the groove opening 52b to the bottom of the groove 52a so that the material of the starting adhesive formation 50 ' the groove-shaped depression 52 could completely fill after melting until plastic flow.

A section 24b of the floor structure component 24 immediately above the starting glue formation 50 ' is transparent to laser light of a predetermined wavelength, for example to a UV laser, for example because the floor structure component at this point 24 is formed from correspondingly translucent material, while the remaining sections of the floor structure component 24 made of fiber reinforced thermoplastic material such as LWRT are formed.

By traversing the course of the initial adhesive formation 50 ' , which follows the course of the adhesive seam 50 in 4 corresponds, with a laser the starting adhesive formation 50 ' to the adhesive seam 50 are remelted, the material of the adhesive starting formation 50 ' into the groove-shaped depression 52 flows and completely fills it. That originally at 24 'located floor structure component 24 approaches the surface of the body shell 12 on.

After the material of the adhesive seam 50 has cooled down again and has solidified, is the vehicle floor 14 and in particular the floor structure component 24 adhesive and form-fitting through the adhesive seam 50 with the body shell 12 connected, the adhesive seam 50 moreover, due to its closed circumferential structure, an effective seal against the ingress of liquid into the adhesive seam 50 surrounding area forms.

Claims (8)

Motor vehicle body (10), comprising a surface-coated body shell (12) with a floor support section (16) and comprising a vehicle floor (14) which is separate from the body shell (12) and is fixedly connected to the floor support section (16), the vehicle floor (14 ) comprises a flat, multi-curved, fiber-reinforced plastic comprising floor structure component (24) and at least one floor support (22) connected to the floor structure component (24) with a support material different from the structural material of the floor structure component (24), with a support projection from the floor support section (16) (28) protrudes towards the vehicle interior, on which the floor support (22) is supported and to which the floor support (22) is firmly connected by gluing, the motor vehicle body (10) at least one separately from both the body shell (12 ) and from the vehicle floor (14), at least two legs arranged at an angle to each other l (26a, 26b; 34a, 34b, 34c; 38a, 38b, 38c) comprising securing structure component (26; 34; 38), which for securing the vehicle floor (14) to the body shell (12) by gluing to the body shell (12) or / and with the Floor support (22) is connected, the vehicle floor (14) being additionally glued to the body shell (12) by an adhesive seam (50) apart from the securing structure component (26; 34; 38), characterized in that on a component made of body shell (12 ) and vehicle floor (14) a groove-shaped depression (52) following the course of the adhesive seam (50) is formed, in which there is adhesive material which is connected to the respective other component of body shell (12) and vehicle floor (14). Motor vehicle body (10) after Claim 1 , characterized in that the vehicle floor (14) is additionally glued to the body shell (12) by means of at least one circumferential adhesive seam (50). Motor vehicle body (10) after Claim 2 , characterized in that the circumferential adhesive seam (50) runs closed. Motor vehicle body (10) according to one of the preceding claims, characterized in that the groove-shaped recess (52) is formed in the body shell (12). Motor vehicle body (10) according to one of the preceding claims, characterized in that the clear width (w) of the groove-shaped recess (52) starting from a groove base (52b) remote from a groove opening (52b) towards the groove opening (52b) decreased. Motor vehicle body (10) according to one of the preceding claims, characterized in that the vehicle floor (14) from the side facing away from the body shell (12) along the course of the adhesive seam (50) is transparent to a wavelength range of electromagnetic radiation which is in the wavelength range from, each including, infrared light to ultraviolet light. A method for the adhesive connection of a motor vehicle body shell (12) to a vehicle floor (14), comprising the following steps: - Providing a vehicle floor (14) with a web (50 ') of thermoplastic plastic protruding therefrom on the side (24a) facing the bodyshell (12) when fully assembled, - Approach the vehicle floor (14) to the body shell (12) and thereby Inserting at least a portion of the protruding plastic web (50 ') into a groove-shaped recess (52) in the body shell (12), Melting the plastic sheet (50 ') into a flowable state, - Allow the thermoplastic to cool and solidify in the melted plastic sheet (50 '), thereby forming an adhesive seam (50). Procedure according to Claim 7 , characterized in that the melting of the plastic web (50 ') takes place by laser irradiation.

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