RU2778260C1 - Car body structure and car - Google Patents

Abstract

FIELD: transport engineering.

SUBSTANCE: inventions group relates to the field of transport engineering. The structure of the car body contains in its aft part the front transverse beam of the rear part of the floor, under which there are two longitudinal beams of the rear part of the floor symmetrically with respect to the central axis of the body. Relative to the central axis of the body, two V-shaped racks are symmetrically located, equal to the ends of the front transverse beam of the rear of the floor. The ends of the front cross member of the rear floor are firmly connected to the two longitudinal members of the rear floor and the two B-pillars. The cross section of the support has an annular shape. One of the ends of one of the two panels, i.e. the top support panel or the bottom support panel, forms the outer/inner board. There are reinforcing panels at the ends of the front transverse beam of the rear part of the floor. The reinforcing panels of the front transverse beam form the shape of the letter "L". The car contains a body having the mentioned design.

EFFECT: reducing the risk of injury and ensuring safety for passengers.

9 cl, 22 dwg

Description

The contents of the claim to the right of priority in relation to the invention under the name "Car Body Structure", the application for which was filed with the PRC Patent Office on July 10, 2019 under the number 201910621125.9, are given in this patent application in full by citation.

Technical field

This patent application relates to the field of automotive technology, in particular, the structure of the car body and the car itself.

State of the art

At present, five-door vehicles (vehicles with four doors and one trunk) such as passenger cars, sports utility vehicles, SUVs, etc., are the most common in the market. In addition to the five-door, there are small or high-end cross-country cars that are of the three-door type (cars with two doors and one trunk). In the aft parts of the body structures of all types of cars, whether five-door or three-door, as a rule, beams are installed, called rear floor front cross beams and consisting mainly of the main blocks of the front cross beams and their overlap plates. Some car models can be additionally equipped with reinforcing structures. In the event of a side collision of a vehicle, the front cross member of the rear floor part of the above-described structure can serve to receive and transfer the impact force to the other side of the body, thereby reducing the impact of the impact and ensuring the safety of passengers.

However, in practical application, the existing types of front transverse beams of the rear part of the body floor have the following disadvantages:

First, the current types of front transverse beams of the rear floor of the body are designed so that in the event of a side collision, the impact force on the path of redirection to the other side of the car is subjected to multiple dissipation, which leads to a decrease in the efficiency of its transmission and absorption by the floor of the body of part of the dissipating force. collision and subsequently increase the risk of injury to occupants.

Secondly, the production technologies of the current types of front cross beams of the rear floor of the body are complex and require large development costs, in addition, in most cases they are made by stamping panels of the same thickness, greatly increasing the weight of the body.

Thirdly, the disadvantage of three-door cars is the relatively large height difference of the rear part of the floor and, as a result, its large depth, which, as a result, complicates the production technology and increases development costs.

The essence of the invention

In view of the foregoing, this patent application presents a new type of body structure, the relevance of which is to eliminate at least one of the shortcomings of today's technologies.

To achieve one of the above goals, the following technical solutions are presented in this patent application:

The structure of the car body, in the aft part of which there is a front transverse beam of the rear part of the floor, and under it symmetrically with respect to the central axis of the mentioned body there are two longitudinal beams of the rear part of the floor, in addition, also symmetrically with respect to the central axis of the mentioned body there are two B-shaped racks, aligned with the ends of said front transverse beam of the rear part of the floor, and the ends of the mentioned front transverse beam of the rear part of the floor are firmly connected to the two said longitudinal beams of the rear part of the floor and two V-shaped posts.

Further, at the ends of said rear floor front transverse beam, there are connecting strips, by means of which said rear floor front transverse beam is firmly connected to said rear floor longitudinal beams and B-pillars.

Further, said connecting strips are connected to the inner plates of the mentioned longitudinal beams of the rear part of the floor, installed inside the longitudinal beams.

Further, said connecting strips are connected to the reinforcing panels of said B-pillars installed inside the pillars.

Further, said B-pillar reinforcing panels are firmly coupled to said connecting strips and constitute a load-bearing support that is flush with said front crossbeam of the rear floor.

Further, said support has an annular section and includes upper and lower carrier panels firmly interlocked with each other, wherein at least one of the ends of at least one of the two panels (i.e., the upper carrier panel or the lower carrier panel) forms an outer/inner board.

Further, said front transverse beam of the rear floor part is located on top of the rear floor part of said body.

Further, said front cross beam of the rear part of the floor consists of the main block of the front cross beam and the overlapping plate of the front cross beam attached to the cross beam itself, and due to such attachment, between the said front cross beam and its overlapping plate, locking with each other, a certain a frame extending along the length of said front transverse beam at the rear of the floor.

Further, at the ends of said front transverse beam of the rear part of the floor, there are reinforcing panels firmly attached to the transverse beam itself and located inside the said frame, moreover, said front transverse beam reinforcing panels have the same sections as the front transverse beam itself, and form, as and the last, the shape of the letter L.

Further, said front transverse beam consists of end plates located at two ends of the beam, and an intermediate plate located between the end plates and attached to the latter by means of laser welding, and the thickness of the said intermediate plate is less than the thickness of the mentioned end plates, and the mentioned reinforcing panels of the front transverse beams are firmly connected to said end plates.

The present patent application also discloses a new type of vehicle with a body having the above-described design, using examples of the invention.

Compared to existing technologies, the invention presented in this patent application has the following advantages:

The vehicle body and structure presented in this patent application is designed so that the rear floor front cross member is flush with the B-pillars on both sides, and the rear floor front cross member is firmly connected to these pillars and the rear side stringers. gender. Thus, in a side collision of a car, the force from the collision is directly transmitted to the other side of the body through the front transverse beam of the rear floor and practically does not dissipate along the way, which increases the transmission efficiency and reduces the amount of impact force absorbed by the floor of the body, and therefore reduces the risk of injury. and ensure the safety of passengers.

The foregoing is only a brief overview of the technical solutions proposed by the invention presented in this application. In order to more widely disclose the essence of the technical methods of the invention presented in this patent application and in accordance with the instructions to put it into practice, as well as to provide explanations and make more understandable the characteristic features, advantages and one of the above and other objectives of the invention presented in this application , the following are specific examples of the implementation of this invention.

Description of drawings

In order to clarify the technical solutions offered by the examples of implementation of the invention presented in this application or existing technologies, the following is a summary of the illustrations used to describe the examples of implementation of the present invention or existing technologies, and it is obvious that the following illustrations refer to examples implementation of the invention presented in this patent application, and can serve as a basis for ordinary technical workers in this field to obtain other illustrations without creative work.

The illustrations that form part of this patent application are used to facilitate understanding of the essence of the invention presented in the application, and the illustrated examples of implementation and textual explanations for them serve to interpret this application and do not impose unnecessary restrictions on this application. The following are explanations of the accompanying illustrations:

In FIG. 1 is a diagram of the car body structure mentioned in the embodiments of the invention presented in this patent application;

In FIG. 2 is a diagram of the connection of the front cross beam of the rear part of the floor with the reinforcing panels of the V-shaped pillars (left and right) and the longitudinal beams (left and right) of the rear part of the floor, mentioned in the embodiments of the invention presented in this patent application;

In FIG. 3 is a detail drawing of the image in FIG. 2;

In FIG. 4 is a structural diagram of the reinforcement panel of the left B-pillar mentioned in the embodiments of the invention presented in this patent application;

In FIG. 5 is a diagram of the construction of the reinforcement panel of the right B-pillar mentioned in the embodiments of the invention presented in this patent application;

In FIG. 6 is a diagram of the construction of the reinforcement panel of the left B-pillar mentioned in the embodiments of the invention presented in this patent application, from a different angle;

In FIG. 7 is a diagram of the structure of the upper support panel of the left B-pillar mentioned in the embodiments of the invention presented in this patent application;

In FIG. 8 is a diagram of the construction of the upper support panel of the left B-pillar mentioned in the embodiments of the invention presented in this patent application, from a different angle;

In FIG. 9 is a diagram of the construction of the lower support panel of the left B-pillar mentioned in the embodiments of the invention presented in this patent application;

In FIG. 10 is a diagram of the construction of the lower support panel of the left B-pillar mentioned in the embodiments of the invention presented in this patent application, from a different angle;

In FIG. 11 is an enlarged drawing of part A of FIG. four;

In FIG. 12 is a diagram of the construction of the inner plate of the left stringer of the rear part of the floor mentioned in the embodiments of the invention presented in this patent application;

In FIG. 13 is a diagram of the construction of the inner plate of the left stringer of the rear part of the floor, mentioned in the embodiments of the invention presented in this patent application, from a different angle;

In FIG. 14 is a diagram of the construction of the left connection bar mentioned in the embodiments of the invention presented in this patent application;

In FIG. 15 is a diagram of the construction of the front cross beam of the rear part of the floor mentioned in the embodiments of the invention presented in this patent application;

In FIG. 16 is a frontal view of FIG. fifteen;

In FIG. 17 is a left projection of FIG. 16;

In FIG. 18 is a right side view of FIG. 16;

In FIG. 19 is a detail drawing of the image in FIG. fifteen;

In FIG. 20 is a sectional drawing of the front crossbeam of the rear floor mentioned in the embodiments of the invention presented in this patent application;

In FIG. 21 is an illustration of parts a and b of the front cross beam of the rear floor mentioned in the embodiments of the invention presented in this patent application, indicating the thickness of their walls;

In FIG. 22 is a diagram of the relationship between the front transverse beam of the rear part of the floor mentioned in the embodiments of the invention presented in this patent application and the rear part of the floor;

Explanations for marking in illustrations:

100 - front cross beam of the rear part of the floor, 101 - main block of the front cross beam, 102 - overlapping plate of the front cross beam, 103 - left reinforcing panel of the front cross beam, 104 - right reinforcing panel of the front cross beam;

200 - reinforcing panel of the left B-pillar, 201 - main block of the reinforcing panel of the V-shaped rack, 202 - upper carrier panel, 203 - lower carrier panel;

300 - reinforcing panel of the right V-shaped rack;

401 - the inner plate of the left longitudinal beam of the rear of the floor, 402 - the left connecting strip;

501 - the inner plate of the right longitudinal beam of the rear of the floor, 502 - the right connecting strip;

601 - back of the floor.

EXAMPLES OF CARRYING OUT THE INVENTION

In order to disclose the essence of one of the above tasks, technical solutions and advantages of the invention presented in this patent application, the following is a full and detailed description of the technical solutions applicable in the embodiments of the invention, using illustrations in the form of drawings. However, the following examples of implementation of the invention cover only a part, and not the entire scope of its application. All other ways of implementing the invention, obtained by ordinary technical workers in this field on the basis of the examples given in this patent application without creative work, are objects of patent rights and are subject to protection within the framework of this application.

It should be noted that in the absence of contradictions, the embodiments of the invention presented in this patent application, and their characteristic features can be mutually combined.

Below, in the examples of implementation with illustrations in the form of the attached drawings, a detailed description of the invention presented in this patent application is given.

These exemplary embodiments of the invention relate to a body structure that can be applied to the currently most common car models with five or three doors, due to which, in a side collision of a car, the impact force is transferred to the other side of the body, resulting in safety for passengers inside the car. .

As seen in FIG. 1, in the aft part of the body structure presented in these implementation examples, there is a front transverse beam of the rear part of the floor 100, under which there are two longitudinal beams of the rear part of the floor symmetrically with respect to the central axis of the mentioned body, in addition, also symmetrically with respect to the central axis of the mentioned body are located two B-studs aligning with the ends of said back floor front cross-beam 100, wherein the ends of said rear-floor front cross-beam 100 are firmly engaged with said two rear floor longitudinals and two B-studs.

In addition, one of the main novelty of the invention described in these examples of implementation is the relative position and connection between the front cross-beam of the rear floor 100, the longitudinal beams of the rear floor and B-pillars, as well as the design of the structures of the above elements, which will are described in turn below, so these examples, including the accompanying illustrations, only cover the portion of the invention relating to the rear floor front cross member, rear floor stringers, and B-pillars. It should also be noted that other parts of the body structure, not related to the parts, the technical features of which are described in these embodiments of the invention, are the same as in the bodies of existing five-door or three-door cars, and therefore they will not be discussed in this document. .

As follows from these examples of implementation, an excellent feature of the present implementation method is that at two ends of the front cross beam of the rear part of the floor 100 there are connecting strips, with which the front cross beam of the rear part of the floor 100 is firmly engaged with the longitudinal beams of the rear part of the floor and V-shaped racks. Furthermore, as seen at the junctions of the front floor rear cross member 100 and the rear floor stringers illustrated in FIG. 2 and FIG. 3, the connector strips at the ends of the front rear floor cross member 100 are firmly engaged with the inner plates of the rear floor stringers, and at the junction of the front rear floor cross member 100 and the B-pillars, it can be seen that the connector straps at the ends of the front cross member rear of the floor 100 are firmly bonded to the reinforcement panels of the B-pillars installed inside the struts.

In view of the foregoing, for convenience of description, within the framework of these examples of the invention, under the connecting strips at the ends of the front transverse beam of the rear part of the floor 100, the left connecting strip 402 and the right connecting strip 502 will be understood, under the reinforcing panels of the B-shaped pillars, the reinforcing panel of the left B-shaped pillar 200 and the reinforcing panel of the right B-pillar 300, and under the inner plates of the rear floor longitudinal beams - the inner plate of the left longitudinal beam of the rear floor section 401 and the inner plate of the right longitudinal beam of the rear floor section 501 (see any of Fig. 1, 2 and 3). Moreover, the connecting strips, the reinforcement panels of the B-pillars and the inner plates of the rear floor stringers have the same structure, and will be described separately in the following text with examples of the left connecting strip 402, the reinforcement panel of the left B-pillar 200, and the inner plate of the left longitudinal beam of the rear part of the floor 401.

The reinforcement panel structure of the left B-pillar 200 mentioned in these embodiments is illustrated in FIG. 4 and FIG. 5. The main component of this design is the main block of the reinforcing panel of the B-pillar 201, which is an elongated stamped part with a smaller section at the top and a larger one at the bottom and having a configuration that is generally similar to the B-pillar of the body, and the main block of the reinforcing The B-pillar panel 201 is shaped like a U and includes reinforcing ribs that extend along the entire length of the strut, and structural strength is provided by beaded edges.

Another excellent feature of the present implementation described in these examples is that the B-pillar reinforcing panels are provided with load-bearing posts attached to the tie bars, said load-bearing posts being flush with the front crossbeam of the rear floor 100. the supports help increase the strength of the connection of the B-pillar reinforcement panels to both the connecting strips and the front cross member of the rear floor 100, thereby ensuring the effective transfer of the impact force taken by the B-pillars in a side collision of a vehicle to the front cross beam of the rear part of the floor 100.

With respect to the support legs installed between the B-pillar reinforcement panels and the tie bars, as seen in the reinforcement panel of the left B-pillar 200 shown in FIG. 7-10, the cross-section of the support has an annular shape, and its structure includes an upper carrier panel 202 and a lower carrier panel 203 interlocked with each other, the upper carrier panel 202 is an inverted U-shaped plate, and the lower carrier panel 203 is a plate. in the form of a conventional letter U. The holes of the two bearing panels are connected to each other and form the aforementioned annular section.

In addition, in order to strengthen the connection between the upper carrier panel 202 and the lower carrier panel 203, the edges on both sides of their openings are beaded so that when the upper carrier panel 202 and the lower carrier panel 203 are engaged with each other, the edges are closely adjacent to each other, and the connection of the upper carrier panel 202 and the lower carrier panel 203 is made by welding. In addition to the beaded edge designs that serve to connect the upper carrier panel 202 and the lower carrier panel 203, the ends of these carrier panels are also beaded in the context of these embodiments of the invention, and the beaded edges of the carrier panels 202 and 203 are differently curved and form both the outer and inner sides. The folding method is determined based on the way the carrier is connected to the reinforcement panel of the left B-pillar 200 and the left connection bar 402.

In particular, as shown in FIG. 11, the flanging at the ends of the upper carrier panel 202 and the lower carrier panel 203 inside the carrier column, at the side of which the carrier column is connected to the reinforcing panel of the left B-pillar, is internal, and the flanging at the ends at the side of which the support is connected to the left connection panel 402 is the outer one. Such a design, due to the structural features of the main block of the B-pillar reinforcement 201, helps to strengthen the connection between the support column and the block 201, and due to the features of the left connecting bar 402, it helps to strengthen the connection between the support column and the bar 402. However, other methods can be used, of course. flanging the edges of the bearing support, other than the above, if with the edges flanged in such ways, the possibility and strength of the connection between the structural elements of the structure is still ensured.

As shown in FIG. 12 and FIG. 13, each of the two sections of the structure shown in these embodiments of the inner plate of the left stringer of the rear floor 401 has the shape of a quadrilateral with one right angle, the structure being relatively large at one end and gradually tapering towards the second end. In addition, beaded edges serve to increase the strength of the structure as a whole. As shown in FIG. 14, the structure of the left connecting bar 402 is a flat-shaped structure with numerous reinforcing ribs at the ends, the structure is also narrow at one end and gradually widens towards the second end. With regard to connections, the bottom edge of the left connecting bar 402 is welded to the inner plate of the left stringer of the rear floor, the reinforcing panel of the left B-pillar 200 and the bearing support installed inside it are welded to one side of the left connecting bar 402, and the front transverse rear floor beam 100 and opposite the left B-pillar reinforcing panel 200 weld to the other side of the left tie bar 402.

As shown in FIG. 15-19, the rear floor front cross member 100 referred to in these embodiments is composed of the front cross member main block 101 and the front cross member cover plate 102 firmly coupled to the main cross member assembly 101, the front cross member cover plate 102 is located on top of the main block of the front cross beam 101, and, closing with each other, they form a kind of frame that extends along the length of the front cross beam of the back of the floor 100.

Specifically, the sectional shape of the main block of the front cross member 101 resembles, as seen in FIG. 20, the letter "L", and the front cross member cover plate 102 is a plate-like structure as a whole, and when connected to the main block of the front cross member 101, the front cross member cover plate 102 tightly covers the lower opening of the front cross member main body with one side thereof. of the transverse beam 101, whereby the aforementioned frame is formed. The other side of the cover plate of the front transverse beam 102 extends from the front transverse beam of the rear floor 100 towards the front of the body and at its very end is connected to the front of the floor in the body.

On the side of the overlapping plate of the front transverse beam 102 shown in these embodiments, from which it extends towards the body, a gap is also formed in which an intermediate span extends inside the body. It is worth paying attention to the fact that the ends of the main block of the front cross beam 101 are beaded outward, and through the beaded edges of the ends of the main block of the front cross beam 101, the front cross beam of the rear part of the floor 100 and the connecting strips on its two sides are firmly connected to each other by welding, moreover, the connecting bar and located on both sides of the front cross beam of the rear part of the floor 100 and the bearing support installed inside the B-pillar form a three-layer welded structure, which serves to provide high strength connections.

Another excellent feature of the present method of implementation described in these examples is that, in order to ensure a secure connection between the front cross beam of the back of the floor 100 and the connecting strips on both sides of it, reinforcing panels are installed at the ends of the front cross beam of the back of the floor 100 front transverse beam, and the reinforcing panels are built into the said frame. The left reinforcing panel of the front transverse beam 103 and the right reinforcing panel of the front transverse beam 104 are distinguished, in addition, both reinforcing panels, like the main block of the front transverse beam 101, have sections of the same shape - the shape of the letter L, and the reinforcing panels of the front transverse beam are also welds are attached to the front cross beam of the rear of the floor 100.

The shape of the letter L, which is the cross-sections of the main block of the front cross beam 101 and the reinforcing panels on both sides of the front cross beam, is obtained by simple bending, due to which the material consumption coefficient of up to 90% or more is significantly increased compared to existing drawing technologies, and reduced costs for the development of the front transverse beam of the rear part of the floor 100.

In addition, in order to reduce the weight of the front cross member of the rear floor 100 and achieve a lightweight body structure, these examples suggest the following as a priority implementation: as seen in FIG. 21, the main block of the front cross beam 101 is mainly composed of end plates b located at the ends of the beam, and an intermediate plate a located between the end plates b and attached to the latter by laser welding, and the thickness of the intermediate plate a is less than the thickness of the end plates b ( T1<T2) and the reinforcement panels of the front cross member are firmly connected to the end plates b. The structure designed in this way makes it possible, on the one hand, to ensure the strength, stability and ability of the body to withstand impacts during lateral collisions of the vehicle, and on the other hand, to achieve lightness of the body structure.

As shown in FIG. 22, in order to reduce the molding depth of the rear floor of the body 601, simplify the manufacturing technology of the rear floor 601, and reduce the cost of developing not only the rear floor 601 but the entire vehicle, it is possible to position the front cross member of the rear floor 100 on top of the rear floor in body 601, as suggested in these examples as a priority implementation option. Moreover, due to the relative configuration of the front crossbeam of the rear floor 100 and the rear floor 601, the height difference H of the rear floor 601 is reduced, and one of the goals of simplifying manufacturing technology and reducing development costs is achieved.

Based on the foregoing, it can be concluded that the distinguishing feature of the vehicle body structure presented in these embodiments is the aligned location of the front cross member of the rear floor 100 and the B-pillars on both sides, as well as the engagement of the front cross member of the rear floor 100 with B-pillars and rear floor stringers, so that in the event of a side collision of the vehicle, the force from the collision is directly transmitted to the other side of the body through the front cross member of the rear floor 100 and is almost not dissipated along the way, thereby improving transmission efficiency and reducing the amount of impact force absorbed by the body floor, and consequently, the risk of injury is reduced and safety for passengers is ensured, which confirms the practicality of such a design.

In the embodiments of the invention given in this patent application, a type of car with a body having the above-described structure is also presented.

The above examples are examples of the best applications of the invention presented in this patent application, but do not set any boundaries in its implementation. Any changes, adequate replacements or improvements made to the invention presented in this application without violating its main idea and principles are objects of patent rights and are subject to protection within the framework of this application.

Finally, it should be noted that these examples of implementation serve only to describe the technical solutions presented in this patent application, and do not place any restrictions on them. Although the above examples of implementation give a detailed description of the invention, which is filed by this application, ordinary technical workers in this field should understand that they can make certain changes to the technical solutions presented in the above examples of implementation, or to make adequate replacement of a part of the technical features, if such changes or replacements do not disappear the essence and do not go beyond those technical solutions that offer examples of the invention given in this patent application.

Claims (11)

1. The structure of the car body, characterized in that in its aft part there is a front transverse beam of the rear part of the floor (100), under which there are two longitudinal beams of the rear part of the floor, symmetrically with respect to the central axis of the mentioned body, in addition, also symmetrically with respect to the central axis of the mentioned of the body there are two V-shaped racks, equal to the ends of the mentioned front transverse beam of the rear part of the floor (100), and the ends of the mentioned front transverse beam of the rear part of the floor (100) are firmly connected to the two said longitudinal beams of the rear part of the floor and two V-shaped racks , moreover, the section of said support has an annular shape and includes an upper carrier panel (202) and a lower carrier panel (203) firmly connected to each other, and at least one of the ends of at least one of the two panels, that is, the upper carrier panel (202) or bottom carrier panel (203), forms the outer/inner board, moreover, at the ends of the said front transverse beam of the rear part of the floor (100) there are reinforcing panels firmly attached to the transverse beam itself and located inside the said frame, moreover, the said reinforcing panels of the front transverse beam have the same sections as the front transverse beam itself (101) , and form, like the latter, the shape of the letter L. 2. The structure of the car body according to claim 1, characterized in that at the ends of the said front transverse beam of the rear part of the floor (100) there are connecting strips, with the help of which the said front transverse beam of the rear part of the floor (100) is firmly engaged with the said longitudinal beams of the rear parts of the floor and B-shaped racks. 3. The structure of the car body according to claim 2, characterized in that said connecting strips are connected to the inner plates of the mentioned longitudinal beams of the rear part of the floor, located inside the latter. 4. Vehicle body structure according to claim 2, characterized in that said connecting strips are connected to reinforcing panels of said B-pillars installed inside the pillars. 5. Car body structure according to claim 4, characterized in that said B-pillar reinforcing panels are firmly engaged with said connecting strips and are load-bearing supports located on a par with said front transverse beam of the rear floor (100). 6. Vehicle body structure according to claim 1, characterized in that said rear floor (100) front transverse beam is located on top of the rear floor (601) of said body. 7. Vehicle body structure according to any one of claims 1 to 6, characterized in that said front floor rear cross member (100) consists of a front cross member main block (101) and a front cross member overlap plate (102) attached to the transverse beam (101) itself, and due to such fastening between the mentioned front transverse beam (101) and its overlapping plate (102), closing with each other, a certain frame is formed, extending along the length of the mentioned front transverse beam of the rear part of the floor (100). 8. Vehicle body structure according to claim 7, characterized in that said front transverse beam (101) consists of end plates (b) located at the two ends of the beam, and an intermediate plate (a) located between the end plates (b) and attached to the latter by laser welding, wherein the thickness of said intermediate plate (a) is less than the thickness of said end plates (b), and said reinforcing panels of the front transverse beam are firmly connected to said end plates (b). 9. A car, characterized in that its body has a design according to any one of claims 1-8.

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