CN218662099U - Reinforcing structure of middle and rear floor and automobile - Google Patents

Abstract

The utility model provides a reinforced structure and car on well back floor. The utility model discloses a strengthening structure of a middle and rear floor, which comprises two vehicle body longitudinal beams and a plurality of cross beams, wherein the two vehicle body longitudinal beams are supported below the middle and rear floor; the reinforcing structure also comprises a connecting plate connected between the cross beam and the vehicle body longitudinal beam; the tie plates are lapped over the ends of the cross members and connected to the side and/or bottom portions of the body rails. Meanwhile, a cavity is formed by the surrounding part of the connecting plate between the cross beam and the vehicle body longitudinal beam; along the direction approaching the vehicle body longitudinal beam, the cross section of the cavity of the connecting plate on at least part of the cross beam is gradually enlarged. The utility model discloses a well additional strengthening on back floor sets up the connecting plate that has the gradual change cavity at the connection position of crossbeam and automobile body longeron, plays the effect of strengthening joint strength between automobile body longeron and the crossbeam, is favorable to promoting the support steadiness of each crossbeam centering back floor, does benefit to the bearing structure intensity of back floor in the improvement vehicle.

Description

Middle and rear floor reinforcing structure and automobile

Technical Field

The utility model relates to an automobile body structure technical field, in particular to additional strengthening on well back floor. Additionally, the utility model discloses still relate to an automobile.

Background

The middle rear floor refers to a middle rear part in the floor of the vehicle body, the position is located at the middle rear part of the whole vehicle body, and the position is a position with a physical index located between a first-order bending mode and a second-order bending mode of the floor and has larger vibration energy response; moreover, the position is positioned at a weak part in the middle of the whole vehicle body and is used for bearing excitation vibration energy of the rear suspension, and the energy of excitation of tires of the rear suspension, excitation of a rear motor reducer and the like can excite vibration of a middle rear floor plate, so that the problems of vibration noise and the like are caused.

The position generally has higher Vibration sensitivity, but as the requirement of a user on vehicle comfort is continuously improved, the design of the middle rear part position of the vehicle body floor is more and more important, how to reduce the response of the middle rear part position of the vehicle body floor to Vibration Noise and how to improve the attenuation of the middle rear part position of the vehicle body floor to Vibration and Noise energy are important directions for developing and improving NVH (Noise, vibration and Harshness).

In the prior art, the middle floor and the rear floor at the position are designed to be flat plate structures, so that the strength is low; in a general reinforcement method, the structural strength of the middle and rear floor is improved by increasing the number of cross beams and longitudinal beams under the floor. However, due to the existing middle and rear floors and the reinforcing beam framework structure thereof, various unreasonable points still exist in the aspects of specific reinforcing structure design, arrangement position arrangement of the reinforcing beam and the like, so that the ideal effect is still difficult to achieve in the aspects of attenuating the floor vibration caused by rear tire excitation and rear motor reducer excitation vibration.

Therefore, it is necessary to continuously improve the design of the overall structure of the rear floor in the vehicle through deep research and development design so as to achieve the effects of continuously reducing the vibration in the vehicle and improving the riding comfort of passengers in the vehicle.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to a reinforcement structure for a middle and rear floor, so as to improve the supporting structure strength of the middle and rear floor in a vehicle.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a reinforcing structure of a middle and rear floor comprises two vehicle body longitudinal beams and a plurality of cross beams, wherein the two vehicle body longitudinal beams are supported below the middle and rear floor; the reinforcing structure further comprises a connecting plate connected between the cross beam and the vehicle body longitudinal beam; the connecting plate is lapped on the end part of the cross beam and is connected with the side part and/or the bottom part of the vehicle body longitudinal beam; the part of the periphery of the connecting plate, which is positioned on the cross beam and the body longitudinal beam, is provided with a cavity; the cross section of the cavity of the connecting plate on at least part of the cross beam is gradually enlarged along the direction approaching the longitudinal beam of the vehicle body.

Furthermore, the cross section of the cross beam is in a shape like a Chinese character 'ji', the cross beam is provided with a bottom plate and side plates which are bent and formed on two sides of the bottom plate, cross beam flanges are formed on the edge parts of the side plates, and the cross beam flanges abut against the middle and rear floors.

Furthermore, the connecting plate comprises a connecting plate bottom plate lapped on the bottom plate and connecting plate side plates lapped on the two side plates respectively; the connecting plate bottom plate and the connecting plate side plate enclose the cavity.

Further, two connecting plates are stacked at the end part of at least part of the cross beam; the connecting plate bottom plate of the connecting plate of the lower layer extends towards the direction of the vehicle body longitudinal beam and is lapped on the bottom of the vehicle body longitudinal beam, and an interlayer cavity is formed between the two layers of the connecting plates.

Further, the side plate and the bottom plate enclose an inner cavity of the cross beam; at least part of the inner cavity of the cross beam is internally provided with a first reinforcing plate supported between the two side plates, and/or at least part of the cross beam flanging is provided with a second reinforcing plate connected with the middle rear floor.

Furthermore, at least part of the side plates and/or the bottom plate of the cross beam is formed with a rib structure.

Furthermore, first arched bulges are formed on at least part of the beam flanging of the beam, and/or second arched bulges are formed on the connecting parts of the beam flanging and the side plates of at least part of the beam.

Furthermore, the cross section of the vehicle body longitudinal beam is in a shape like a Chinese character 'ji', the vehicle body longitudinal beam is provided with a bottom wall and side walls formed by bending on two sides of the bottom wall, and longitudinal beam flanges abutted against the middle and rear floors are formed on the edge parts of the side walls; the connecting plate is fixedly connected with the longitudinal beam flanging and the side wall.

Furthermore, a plurality of supporting plates supported between the two side walls are arranged in the vehicle body longitudinal beam, and each supporting plate is arranged corresponding to each cross beam; and/or a reinforcing longitudinal beam is connected between two adjacent cross beams.

Compared with the prior art, the utility model discloses following advantage has:

the utility model discloses a strengthening structure of middle and rear floor, which is based on two vehicle body longitudinal beams, a plurality of cross beams are arranged between the two vehicle body longitudinal beams, and the vehicle body longitudinal beams and the cross beams jointly form a bearing for the middle and rear floor; meanwhile, the connecting plate is arranged at the connecting part of the cross beam and the vehicle body longitudinal beam, so that the connecting plate can be conveniently manufactured independently and the structure reinforcing shape of the connecting plate can be conveniently arranged on the connecting plate; the gradual change cavity structure that forms on the connecting plate can promote the connection steadiness between automobile body longeron and the crossbeam, is favorable to promoting each crossbeam centering back floor's support firmness to improve back floor's bearing structure intensity in the vehicle.

Meanwhile, the cavity of the connecting plate is designed into a shape with an increasingly large cross section, so that the structural stability between the longitudinal beam and the cross beam of the vehicle body can be effectively improved, and the damping effect of the connecting part on vibration transmission can be favorably improved.

In addition, the reinforcing plate is arranged in the inner cavity of the cross beam, so that strong support for the two side plates can be formed, and the structural strength of the cross beam is improved; the reinforcing plate arranged on the flanging of the cross beam can effectively increase the connecting area of the cross beam and the middle and rear floors, thereby improving the integral stability of the middle and rear floors and the cross beam.

Another object of the present invention is to provide a car, the middle and rear floor of the car is provided with the reinforced structure of the middle and rear floor. The utility model discloses a car has the technical advantage that the additional strengthening of foretell well back floor possessed.

Drawings

The accompanying drawings, which form a part of the present disclosure, are provided to provide a further understanding of the present disclosure, and the exemplary embodiments and descriptions thereof are provided to explain the present disclosure, wherein the related terms in the front, back, up, down, and the like are only used to represent relative positional relationships, and do not constitute an undue limitation of the present disclosure. In the drawings:

fig. 1 is a schematic perspective view of a reinforcing structure of a middle and rear floor according to a first embodiment of the present invention;

fig. 2 is a top view of a reinforcing structure of a middle rear floor according to a first embodiment of the present invention;

fig. 3 is a bottom view of a reinforcing structure of a middle rear floor according to a first embodiment of the present invention;

fig. 4 is a schematic structural view of a reinforcing structure of a middle and rear floor according to a first embodiment of the present invention after removing the middle floor and the rear floor;

FIG. 5 is a top view of the reinforcing structure of FIG. 4;

fig. 6 is a partial structural schematic view of the first cross member and the second cross member according to the first embodiment of the present invention;

FIG. 7 is a partial enlarged view of portion A of FIG. 6;

fig. 8 is a partial schematic structural view of a third cross beam according to a first embodiment of the present invention;

fig. 9 is a partial schematic structural view of a fourth cross beam according to a first embodiment of the present invention;

fig. 10 is a partial structural schematic view of a fifth cross member and a sixth cross member according to a first embodiment of the present invention;

fig. 11 is a schematic cross-sectional view of the portion indicated by B-B in fig. 10.

Description of reference numerals:

1. a body rail; 100. a bottom wall; 101. a side wall; 102. flanging the longitudinal beam; 11. a support plate;

2. a cross beam; 21. a first cross member; 22. a second cross member; 23. a third cross member; 24. a fourth cross member; 25. a fifth cross member; 26. a sixth cross member; 200. an inner cavity; 201. buckling the plate; 202. a side plate; 203. a base plate; 204. flanging the cross beam;

3. reinforcing the longitudinal beam; 31. a first reinforcing stringer; 32. a second reinforcing stringer;

41. a reinforcing plate; 42. a connecting plate; 43. a convex rib structure; 44. an arch-shaped bulge; 411. a first reinforcing plate; 412. a second reinforcing plate; 420. a chamber; 421. connecting a bottom plate; 422. connecting the plate side plate; 423. a bending plate; 424. a lap plate; 425. an interlayer cavity; 441. a first arched projection; 442. a second arched projection;

5. a middle floor; 6. a rear floor; 7. a rear wheel cover plate; 8. a trunk floor.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the appearances of the terms first, second, etc. in the figures are also for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, in the description of the present invention, the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically limited. For example, the connection may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood in combination with the specific situation.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Example one

The embodiment relates to a reinforcing structure of a middle and rear floor, which is beneficial to improving the strength of a supporting structure of the rear floor in a vehicle; one exemplary structure of which is shown in fig. 1-4.

Overall, the reinforcing structure of the mid-rear floor comprises two body rails 1 supported below the mid-rear floor and a plurality of cross members 2, each cross member 2 being connected between the two body rails 1. Meanwhile, the reinforcing structure also comprises a connecting plate 42 connected between the cross beam 2 and the vehicle body longitudinal beam 1; the tie plates 42 are lapped over the ends of the cross members 2 and connected to the side and/or bottom portions of the body side members 1. Meanwhile, a part of the periphery of the connecting plate 42 between the cross beam 2 and the body side beam 1 is formed with a cavity 420; furthermore, the cross section of the cavity 420 of the connecting plate 42 on at least part of the cross member 2 is enlarged in the direction approaching the vehicle body side member 1.

Particularly, the reinforcing structure of this embodiment forms the support chassis of well back floor, and when in actual use, well back floor and reinforcing structure welding link firmly as an organic whole, form the well back floor assembly of vehicle. Of course, as shown in fig. 1 or 2, a trunk floor 8 is provided at the rear of the middle rear floor assembly to construct a frame of a trunk, and a rear wheel house 7 is provided at the side of the middle rear floor assembly to construct a frame of a rear wheel house. The middle and rear floor on the reinforced structure can be an integral plate, and can also be designed into a split structure and consists of a middle floor 5 and a rear floor 6 which are connected in a front-back manner.

As shown in fig. 5, in the present embodiment, the reinforcing longitudinal beam 3 includes a first reinforcing longitudinal beam 31 having both ends connected to the first cross beam 21 and the third cross beam 23, respectively; the second cross member 22 is connected to a middle portion of the first reinforcing longitudinal member 31, and preferably, is disposed in a cross shape. By arranging the first reinforcing longitudinal beam 31 between the first cross beam 21 and the second cross beam 22, a stable frame shaped like a Chinese character tian is formed by the two body longitudinal beams 1, the first cross beam 21, the second cross beam 22, the third cross beam 23 and the first reinforcing longitudinal beam 31, so that the centering floor 5 is stably supported; by utilizing the supporting structure with a plurality of closed ring bodies, the overall strength of the position is increased, and the response sensitivity of the front middle area of the middle and rear floor to vibration excitation can be further reduced.

Meanwhile, the reinforcing longitudinal beam 3 further comprises two second reinforcing longitudinal beams 32 connected between the third cross beam 23 and the fourth cross beam 24, and the two second reinforcing longitudinal beams 32 are respectively arranged on the left side and the right side of the central axis of the vehicle and are symmetrically arranged. Two second reinforcing longitudinal beams 32 are arranged between the third cross beam 23 and the fourth cross beam 24, the two body longitudinal beams 1, the third cross beam 23, the fourth cross beam 24 and the two second reinforcing longitudinal beams 32 form a 'mesh' shaped frame, the connecting area of the middle floor 5 and the rear floor 6 is reinforced, strong support is formed by a plurality of formed closed rings, the integral strength of the position is further enhanced, and the effect of damping vibration is achieved.

In addition to the first cross member 21, the second cross member 22, the third cross member 23, and the fourth cross member 24 described above, the cross member 2 of the present embodiment further includes a fifth cross member 25 located below the middle rear portion of the rear floor panel 6, and a sixth cross member 26 located below the rear end of the rear floor panel 6. The fifth cross beam 25 and the sixth cross beam 26 are arranged in the rear area of the middle rear floor, so that effective support for centering the rear part of the middle rear floor can be formed, the whole middle rear floor assembly forms a whole with stable structure, and the improvement of the vibration attenuation of the whole middle rear floor assembly is facilitated.

As also shown in fig. 5, in the front-rear direction of the vehicle, the spacing D3 between the third cross member 23 and the fourth cross member 24, and the spacing D4 between the fourth cross member 24 and the fifth cross member 25 are each larger than the spacing between the other adjacent ones of the cross members 2. The space between every two adjacent cross beams 2 is reasonably set according to the position conditions of the middle floor 5 and the rear floor 6 and the different conditions of bearing in different areas of the middle floor and the rear floor and the vibration influence, so that the structural reinforcement effect of the whole reinforcement structure can be further enhanced.

Specifically, taking the case where the total length of the middle rear floor of the vehicle body is 2188mm and the width is about 945mm, the distance D1 between the first cross member 21 and the second cross member 22 may be set to 280mm, the distance D2 between the second cross member 22 and the third cross member 23 may be set to 296mm, the distance D3 between the third cross member 23 and the fourth cross member 24 may be set to 618mm, the distance D4 between the fourth cross member 24 and the fifth cross member 25 may be set to 533mm, and the distance D5 between the fifth cross member 25 and the sixth cross member 26 may be set to 269mm, for example. The distance difference between different intervals sets up more than 10mm at least to realize the differentiation of overall structure intensity, reduce the risk that resonance produced.

According to the difference of the distance between different cross beams 2 and the positions of the cross beams, the width of each cross beam 2 should be designed differently, wherein the width of the first cross beam 21 and the width of the fourth cross beam 24 should be designed to be larger, and the width of the other cross beams 2 should be smaller. Specifically, the following description will be made in conjunction with the arrangement of the connecting plates 42, the reinforcing plates 41, and the like of the cross members 2.

In the reinforcing structure of the present embodiment, the beam structures of the body side member 1, the cross member 2 and the reinforcing side member 3 can be designed according to the conventional common technical solutions, and preferably, each beam structure has a cross section in a shape like a Chinese character 'ji', and at the same time, the open side of the cavity of the beam structure abuts against the middle rear floor. Each beam body adopts a structure in a shape like a Chinese character 'ji', so that the beam body has good self structural strength, and the side edges at the two sides of the beam body are abutted on the middle and rear floors, so that the supporting area of the middle and rear floors can be enlarged, a form similar to an arched support is formed, the sensitivity of the middle and rear floors to vibration excitation is favorably reduced, and the effect of improving the riding comfort of passengers in the vehicle is achieved.

Specifically, the cross section of the cross beam 2 is in a shape of a "u" and includes a bottom plate 203 and side plates 202 bent and formed on both sides of the bottom plate 203, and a cross beam flange 204 is formed on an edge portion of the side plates 202, and the cross beam flange 204 abuts against the middle rear floor. Similarly, the vehicle body side member 1 has a cross section in a "u" shape, and includes a bottom wall 100 and side walls 101 formed by bending on both sides of the bottom wall 100, and side member beads 102 formed at edge portions of the side walls 101 to abut on the middle and rear floor panels. The same structure of the inverted V-shaped structure is adopted by the body side member 1, so that the body side member 1 has good self-structural strength and forms good support for centering the rear floor. The reinforcing side member 3 may be provided with reference to the beam structure of the body side member 1 and the cross member 2.

It should be emphasized that, in the present exemplary embodiment, the individual cross members 2 are connected to the body side members 1 via the connecting webs 42. Based on the above-described arrangement of the beam structures of the body side member 1 and the cross member 2, the following configuration is preferably adopted for the structure of the connecting plate 42 and the connection form thereof with the body side member 1.

Referring to fig. 6 to 10, the connecting plate 42 of the present embodiment includes a connecting plate bottom plate 421 overlapped on the bottom plate 203, and connecting plate side plates 422 located at two sides of the connecting plate bottom plate 421, and the two connecting plate side plates 422 are respectively overlapped on the corresponding side plates 202; the connecting plate bottom plate 421 and the connecting plate side plate 422 enclose the cavity 420 of the connecting plate 42. Furthermore, the cross-sectional area of the cavity 420 of the connecting plate 42 at least partially increases in the direction from the cross member 2 toward the body side member 1. The cavity 420 of the connecting plate 42 is designed into a shape with an increasingly large cross section, so that the structural stability between the vehicle body longitudinal beam 1 and the cross beam 2 can be effectively improved, and the damping effect of the connecting part on vibration transmission can be favorably improved. For example, at the end portion of the third cross member 23 shown in fig. 8, the connecting plate 42 is designed in a horn shape that opens toward the body side member 1, i.e., the width of the connecting plate 42 in the vehicle front-rear direction (including the distance between the two side plates 202) and the height of the connecting plate 42 in the vehicle up-down direction are each set gradually larger in the direction approaching the body side member 1, starting from the end portion of the cross member 2; in this way, the connecting plates 42 located at the connecting portions of the side members 1 and the cross member 2 can form a triangular supporting structure when viewed from the top-bottom or front-rear direction of the vehicle, and a good structural reinforcing effect can be achieved.

In the embodiment, the width of the third cross beam 23 is 69mm, the connecting plates 42 of the triangular supporting structures at the two ends of the third cross beam 23 are welded with the bottom wall 100 and the side wall 101 of the vehicle body longitudinal beam 1, the connecting strength of the connecting plates 42 is increased by using the strength of the two surfaces of the vehicle body longitudinal beam 1, and meanwhile, an arched convex reinforcing structure can be designed on the vehicle body longitudinal beam 1 at the welding position, so that the strength of the connecting position is further increased, and the vibration transmission is reduced; the middle position of one side of the third cross beam 23 connected with the second reinforcing longitudinal beam 32 is designed with four convex rib structures 43, so that the welding area and the strength of the middle floor 5 are increased.

Further, as shown in fig. 10 and 11, at the joint of the fifth cross member 25 and the body side member 1, two connecting plates 42 are stacked at the end of the cross member 2; the connecting plate bottom plate 421 of the connecting plate 42 at the lower layer extends towards the direction of the vehicle body longitudinal beam 1 and is lapped on the bottom of the vehicle body longitudinal beam 1; the connecting plate 42 of the upper layer is clamped between the connecting plate 42 of the lower layer and the fifth cross beam 25, and a connecting plate bottom plate 421 of the connecting plate extends towards the direction of the vehicle body longitudinal beam 1 and is connected with the side part of the vehicle body longitudinal beam 1 in an abutting mode; the other parts of the two-layer connecting plate 42 may be stacked.

The connecting plate 42 arranged along the shape of the end part of the conformal beam 2 is also provided with a connecting plate bottom plate 421 and two connecting plate side plates 422; the connecting plate bottom plate 421 is overlapped on the bottom plate 203 in a stacked manner, and the connecting plate side plate 422 is overlapped on the side plate 202 in a stacked manner; the connecting plate 42 is connected to the side of the vehicle body longitudinal beam 1 by the bent plate 423 bent from the end of the connecting plate bottom plate 421 and the connecting plate side plate 422, or the connecting plate bottom plate 421 extends out of the lap plate 424 toward the bottom of the vehicle body longitudinal beam 1 to lap the bottom of the vehicle body longitudinal beam 1, so that a stable connection is formed between the end of the cross beam 2 and the vehicle body longitudinal beam 1. In this way, not only the connection stability between the cross beam 2 and the body side member 1 is significantly improved, but also when the bottom plate 203 of the cross beam 2 and the bottom wall 100 of the body side member 1 are vertically staggered and the lap plate 424 of the web bottom plate 421 is lapped on the bottom of the body side member 1, the web bottom plate 421 is inclined downward in the direction from the cross beam 2 toward the body side member 1, so that the web side plates 422 are substantially triangular, and the structural support strength of the web 42 is improved. Meanwhile, when two connecting plates 42 are stacked, the connecting plate bottom plate 421 of the connecting plate 42 positioned at the lower layer is lapped on the bottom of the vehicle body longitudinal beam 1 through a lapping plate 424, and the connecting plate bottom plate 421 of the connecting plate 42 positioned at the upper layer is connected on the side part of the vehicle body longitudinal beam 1 through a bending plate 423 at the end part; the web bottom plates 421 of the two-layer webs 42 are spaced vertically at the connecting position on the body side member 1, and therefore, at the position close to the body side member 1, the sandwich cavity 425 is formed between the two-layer webs 42, which can further improve the damping effect of the connecting portion between the cross member 2 and the body side member 1 against the transmission of vibration.

It should be noted that the connection plates 42 of the other cross members 2 can be designed with reference to the arrangement of the connection plates 42 of the fifth cross member 25, and the connection plates 42 are preferably fixedly connected to both the side member flanges 102 and the side walls 101 of the vehicle body side member 1. The connecting plate 42 is connected to the side wall 101 and the longitudinal beam flange 102 of the vehicle longitudinal beam 1 at the same time, so that reliable connection firmness between the vehicle longitudinal beam 1 and the cross beam 2 can be guaranteed.

In order to further enhance the self-structural strength of each cross beam 2, in the present embodiment, based on the condition that the side plates 202 and the bottom plate 203 enclose the inner cavity 200 of the cross beam 2, a first reinforcing plate 411 supported between the two side plates 202 may be provided in the inner cavity 200 of the cross beam 2, and/or a second reinforcing plate 412 may be provided on the cross beam flange 204 of the cross beam 2. For example, as shown in fig. 6, two second reinforcing plates 412 are provided to the second cross member 22, and the second reinforcing plates 412 are connected to the middle rear floor. The second cross beam 22 is preferably 53mm in width, 15mm cross beam flanges 204 are designed on two sides of the second cross beam, the connecting area and the connecting strength of the second cross beam with the middle floor 5 are increased, and the rib structure 43 with the length of 117mm and the protruding height of 10mm is designed at the middle weak position of the second cross beam 22. By arranging the reinforcing plate 41 in the inner cavity 200 of the cross beam 2, strong support can be formed for the two side plates 202, and the structural strength of the cross beam 2 is improved; the reinforcing plate 41 arranged on the beam flange 204 of the beam 2 can effectively increase the connecting area of the beam 2 and the middle and rear floor, thereby improving the integral stability of the middle and rear floor and the beam 2.

Specifically, as shown in fig. 7 in combination with fig. 6 and 4, in the first beam 21 of the present embodiment, based on the condition that the first beam 21 is located at the end of the middle floor 5, a buckling plate 201 can be buckled above the first beam 21, so that the inner cavity 200 of the first beam 21 forms a closed chamber.

Moreover, the connecting plates 42 at the two ends of the first cross beam 21 are designed to be in a bell-mouth shape, and the structural strength of the connecting plates 42 can be enhanced by utilizing the arch shape of the bell-mouth structure, and the connecting area between the connecting plates and the vehicle body longitudinal beam 1 is increased, so that the structural strength at the two ends of the first cross beam 21 is increased by fully utilizing the strength of the vehicle body longitudinal beam 1. Moreover, the rib structure 43 having a depth of 10mm and a length 563mm and formed in an arch-shaped concave shape is designed in the middle of the first cross member 21, thereby achieving an effect of increasing the strength at the middle position. In order to further increase the strength of the first cross beam 21, as shown in fig. 7, two first reinforcing plates 411 are arranged in the inner cavity 200 of the first cross beam 21 at intervals, and the two first reinforcing plates 411 are respectively arranged at two sides of the first reinforcing longitudinal beam 31 to reinforce the middle of the first cross beam 21. The two first reinforcing plates 411 here have a thickness of 1.2mm, a width of 37mm, and a position of one third of the overall length of the first beam 21, so that the effects of increasing the strength of the first beam 21 and reducing the vibration response sensitivity thereof are achieved.

As shown in fig. 9 and 10, a first arched projection 441 is formed on the beam flange 204 of the partial beam 2, and a second arched projection 442 is formed at the connecting portion between the beam flange 204 and the side plate 202 of the partial beam 2. The arched protrusion 44 is provided on the beam flange 204 or at the connection portion between the beam flange 204 and the side plate 202, so that the structural firmness of the beam flange 204 of the beam 2 can be improved, and the connection area and the connection stability between the beam flange 204 and the middle and rear floor can be increased, thereby achieving the effect of enhancing the support strength of the middle and rear floor.

The width of the fourth cross beam 24 in this embodiment is 80mm, and the connecting plates 42 with two ends designed into the shape of the bell mouth are also used, so that the strength of the body longitudinal beam 1 is fully utilized to increase the strength of the two ends of the fourth cross beam 24 by utilizing the characteristics that the bell mouth structure has large arch strength and large connecting area with the body longitudinal beam 1. The side and the top of the fourth beam 24 are provided with a plurality of rib structures 43, and two first arched protrusions 441 arranged at intervals are formed on the beam flange 204 of the fourth beam 24 facing to the rear side of the vehicle, so that the effects of increasing the overall strength of the fourth beam 24 and reducing the vibration response sensitivity are achieved.

The width of the fifth beam 25 is 60mm, two connecting plates 42 which are arranged in a stacked mode are arranged at two ends of the fifth beam, three rectangular convex rib structures 43 are arranged on the bottom plate 203, the strength of the bottom plate 203 can be improved, and the sensitivity of vibration response of the bottom plate is reduced; meanwhile, circular lightening holes are designed between adjacent rib structures 43 to reduce weight. The sixth beam 26 has a width of 48mm, and both ends are also designed as connecting plates 42 in a bell-mouth shape. In order to further increase the reinforcing area and the frequency avoiding effect of the middle rear floor panel, the widths of the beam flanges 204 at the front side and the rear side of the sixth beam 26 are respectively 14mm and 33mm so as to increase the welding area of the sixth beam and the rear floor 6, and the local frequency avoiding effect can be further realized by the width difference of the two sides. Furthermore, two second arched protrusions 442 are formed at a distance from each other at the connection portion between the beam flange 204 and the side plate 202 on the side (rear side) of the sixth beam 26 facing the trunk floor 8, thereby further increasing the strength of the beam flange 204.

In addition, the vehicle body side member 1 of the present embodiment is further provided with a plurality of support plates 11 supported between the two side walls 101, and each support plate 11 is provided corresponding to each cross member 2; a plurality of support plates 11 are arranged in the vehicle body longitudinal beam 1, so that good support for the strength of the vehicle body longitudinal beam 1 can be formed in the width direction of the vehicle body longitudinal beam 1; the supporting plate 11 is arranged at the position corresponding to the cross beam 2, so that the structural strength of the connecting part of the vehicle body longitudinal beam 1 and the cross beam 2 can be effectively enhanced, and a more stable foundation is provided for the arrangement of the cross beam 2.

In summary, in the reinforcing structure of the middle rear floor in the embodiment, two vehicle body longitudinal beams 1 are taken as a basis, a plurality of cross beams 2 are arranged between the two vehicle body longitudinal beams 1, and the vehicle body longitudinal beams 1 and the cross beams 2 jointly form a support for centering the rear floor; meanwhile, the connecting plate 42 is arranged at the connecting part of the cross beam 2 and the vehicle body longitudinal beam 1, so that the independent manufacture of the connecting plate 42 and the arrangement of the structure reinforcing shape on the connecting plate are facilitated; by means of the structure of the gradually-changed chambers 420 formed in the connecting plates 42, the connecting stability between the body longitudinal beams 1 and the cross beams 2 can be improved, the supporting firmness of the rear floor centered by each cross beam 2 can be improved, and therefore the supporting structural strength of the rear floor in the vehicle can be improved.

Example two

The embodiment relates to an automobile, and a middle rear floor of the automobile is provided with the reinforcing structure provided by the first embodiment. By structural reinforcement of the rear-middle portion of the floor panel, the structural performance of the panel can be significantly enhanced, its vibration response sensitivity is reduced, and a good structural foundation is provided for creating a quiet and comfortable driving space for the vehicle.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The reinforcing structure of the middle and rear floor comprises two vehicle body longitudinal beams (1) and a plurality of cross beams (2) which are supported below the middle and rear floor, wherein each cross beam (2) is connected between the two vehicle body longitudinal beams (1); the method is characterized in that:

the reinforcing structure further comprises a connecting plate (42) connected between the cross beam (2) and the vehicle body longitudinal beam (1);

the connecting plate (42) is lapped on the end part of the cross beam (2) and is connected with the side part and/or the bottom part of the vehicle body longitudinal beam (1);

the part of the connecting plate (42) between the cross beam (2) and the vehicle body longitudinal beam (1) is surrounded to form a cavity (420); the cross-sectional area of the chamber (420) of the connecting plate (42) on at least one part of the transverse beam (2) increases in the direction toward the vehicle body longitudinal beam (1).

2. The reinforcing structure of a middle rear floor according to claim 1, wherein:

the cross section of the cross beam (2) is in a shape like a Chinese character 'ji', the cross beam is provided with a bottom plate (203) and side plates (202) formed on two sides of the bottom plate (203) in a bending mode, cross beam flanges (204) are formed on the edge portions of the side plates (202), and the cross beam flanges (204) abut against the middle and rear floors.

3. The reinforcing structure of a middle rear floor according to claim 2, wherein:

the connecting plate (42) comprises a connecting plate bottom plate (421) lapped on the bottom plate (203) and connecting plate side plates (422) positioned on two sides of the connecting plate bottom plate (421), and the connecting plate side plates (422) are lapped on the side plates (202);

the connecting plate bottom plate (421) and the connecting plate side plate (422) enclose the cavity (420).

4. The middle and rear floor reinforcing structure according to claim 3, wherein:

two connecting plates (42) are stacked at the end part of at least part of the cross beam (2);

the connecting plate bottom plate (421) of the connecting plate (42) at the lower layer extends towards the direction of the vehicle body longitudinal beam (1), is lapped on the bottom of the vehicle body longitudinal beam (1), and forms an interlayer cavity (425) between the two layers of the connecting plates (42).

5. The reinforcing structure of a middle rear floor according to claim 3, wherein:

the side plates (202) and the bottom plate (203) enclose an inner cavity (200) of the cross beam (2);

at least part of the inner cavity (200) of the cross beam (2) is internally provided with a first reinforcing plate (411) supported between the two side plates (202), and/or at least part of the cross beam flanging (204) of the cross beam (2) is provided with a second reinforcing plate (412) connected with the middle and rear floor.

6. The reinforcing structure of a middle rear floor according to claim 2, wherein:

at least part of the side plates (202) and/or the bottom plate (203) of the cross beam (2) is/are provided with a rib structure (43) in a molding way.

7. The reinforcing structure of middle and rear floor panels as set forth in claim 2, wherein:

first arched bulges (441) are formed on the beam flanging (204) of at least part of the beam (2), and/or second arched bulges (442) are formed on the connecting part of the beam flanging (204) and the side plate (202) of at least part of the beam (2).

8. The reinforcing structure of a mid-rear floor as recited in any one of claims 1 to 7, wherein:

the cross section of the vehicle body longitudinal beam (1) is in a shape like a Chinese character 'ji', the vehicle body longitudinal beam is provided with a bottom wall (100) and side walls (101) formed by bending on two sides of the bottom wall (100), and longitudinal beam flanges (102) abutted to the middle and rear floors are formed on the edge parts of the side walls (101);

the connecting plate (42) is fixedly connected with the longitudinal beam flanging (102) and the side wall (101).

9. The reinforcing structure of a mid-rear floor as set forth in claim 8, wherein:

a plurality of supporting plates (11) supported between the two side walls (101) are arranged in the vehicle body longitudinal beam (1), and each supporting plate (11) is arranged corresponding to each cross beam (2);

and/or a reinforcing longitudinal beam (3) is connected between two adjacent cross beams (2).

10. An automobile, characterized in that:

the middle rear floor of the automobile is provided with the reinforcing structure of the middle rear floor according to any one of claims 1 to 9.

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