Integrated rear floor structure and body-in-white assembly with same

Abstract

The invention discloses an integrated rear floor structure and a body-in-white assembly with the same. Comprising a rear floor panel, rear floor longitudinal beams fixedly connected to the left side and the right side of the rear floor panel, rear wheel covers located on the left side and the right side of the rear floor panel and fixedly connected to the rear floor longitudinal beams, and a rear floor front cross beam fixedly connected between the front ends of the rear floor longitudinal beams. The rear floor panel, the rear floor longitudinal beam, the rear wheel covers and the rear floor front cross beam are of an integrally-formed structure, the front bottom face and the middle bottom face of the integrally-formed structure are respectively provided with a square-frame-shaped reinforcing rib structure and C-shaped reinforcing rib structures, the C-shaped reinforcing rib structures extend to the rear wheel covers on the left side and the right side from the rear floor panel, and a middle floor is fixed above the square-frame-shaped reinforcing rib structures. The designed rear floor structure is good in integration, excellent in lightweight performance, high in yield and good in collision performance, and the overall rigidity and torsion degree of a body in white are effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle body manufacturing, and in particular to an integrated rear floor structure and a body-in-white assembly having the structure. Background Art

[0002] Traditional car body manufacturing uses a process method of stamping a single piece and then welding it into a car body assembly. A car is welded from about 500 parts of different shapes and materials. Before the whole vehicle is officially mass-produced, it generally goes through three rounds of matching and debugging for 6 months, strictly checking and solidifying the manufacturing status of these 500 parts (materials, tooling equipment, process, product qualification rate, packaging, transportation, etc.) to ensure that the final car body quality meets the assembly requirements. Manufacturing, assembly and testing are all very complicated and time-consuming. Therefore, one-piece die-casting technology has become a new trend in car body manufacturing. One-piece die-casting, one-time molding, no complicated process of stamping first and then welding, the manufacturing process is extremely simple, there is only one part, there is no need to develop too much tooling equipment, and there is no error accumulation caused by the connection of a large number of parts, and the manufacturing accuracy is controllable. Since there is no need to check the manufacturing status of each part, the complex car body manufacturing process is shortened, greatly reducing the manufacturing cost of the car body.

[0003] However, the current integrated rear floor of the vehicle body has disadvantages such as poor structural strength, low rigidity, and poor collision performance due to unreasonable design, resulting in structural problems in both the lower body assembly and the body-in-white assembly assembled based on it. Summary of the invention

[0004] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide an integrated rear floor structure with high integration, high structural strength, good collision performance and high rigidity, and a body-in-white assembly having the structure.

[0005] To achieve this object, the integrated rear floor structure designed in the present invention includes a rear floor panel, a rear floor longitudinal beam fixedly connected to the left and right sides of the rear floor panel, a rear wheel cover located on the left and right sides of the rear floor panel and fixedly connected to the rear floor longitudinal beam, and a rear floor front cross beam fixedly connected between the front ends of the rear floor longitudinal beams; the rear floor panel, the rear floor longitudinal beam, the rear wheel cover and the rear floor front cross beam are an integrated molding structure, and the front bottom surface and the middle bottom surface thereof are respectively provided with a square frame-type reinforcing rib structure and a C-type reinforcing rib structure extending from the rear floor panel to the left and right rear wheel covers, and a middle floor is fixed above the square frame-type reinforcing rib structure.

[0006] Furthermore, a rear floor middle cross beam arranged in parallel with the rear floor front cross beam is provided at the front bottom of the rear floor panel, and the left and right ends of the rear floor middle cross beam are respectively fixedly connected to the rear floor longitudinal beams on the left and right sides of the rear floor panel; the square frame-type reinforcement beam includes the rear floor front cross beam, the rear floor middle cross beam and the rear floor longitudinal beam located between the rear floor front cross beam and the rear floor middle cross beam.

[0007] Furthermore, the rear floor front cross beam, the rear floor middle cross beam, and the rear floor longitudinal beam located between the rear floor front cross beam and the rear floor middle cross beam are all provided with triangular reinforcing ribs along their respective length directions.

[0008] Furthermore, the rear portion of the middle floor overlaps with the middle cross beam of the rear floor, the left and right sides of the middle floor overlap with the longitudinal beams of the rear floor, and the front portion of the middle floor overlaps with the front cross beam of the rear floor.

[0009] Furthermore, the C-shaped reinforcement rib structure includes a transverse reinforcement rib arranged parallel to the front cross beam of the rear floor and fixedly connected to the middle part of the rear floor panel, and two vertical reinforcement ribs respectively overlapping the two ends of the transverse reinforcement rib and extending upward to the top of the rear wheel cover.

[0010] Furthermore, the rear end of the rear floor longitudinal beam is provided with a transition connection structure for detachably fixing to the transition connection longitudinal beam, the rear anti-collision beam can be fixed to the rear end of the transition connection longitudinal beam, and the rear floor longitudinal beam can be indirectly connected to the rear anti-collision beam through the transition connection longitudinal beam to prevent the impact force of the rear anti-collision beam from directly impacting the integrated rear floor structure in the event of a collision.

[0011] Furthermore, a body-in-white assembly with the above-mentioned integrated rear floor structure includes a lower body assembly; a side panel, a rear panel assembly and a roof crossbeam fixed to the lower body assembly, the lower body assembly includes a front cabin assembly, a front floor assembly and the integrated rear floor structure fixedly connected in sequence from front to rear along the direction of the vehicle body, and a rear luggage box is fixed to the rear of the integrated rear floor structure.

[0012] Furthermore, the front floor assembly includes a front floor panel assembly and front floor side longitudinal beams fixedly connected to the left and right sides of the front floor panel assembly, the front end of the rear floor longitudinal beam is fixedly connected to the rear end of the front floor side longitudinal beam, and the front portion of the rear floor panel is fixedly connected to the rear portion of the front floor panel assembly.

[0013] Furthermore, a transition connecting longitudinal beam is fixed to the rear end of the rear floor longitudinal beam, the rear enclosure assembly is fixed between the transition connecting longitudinal beams, and the rear luggage box is fixed in a space enclosed by the rear floor panel, the transition connecting longitudinal beam and the rear enclosure assembly.

[0014] Furthermore, the side enclosure includes a left enclosure and a right enclosure fixedly connected to the left and right sides of the lower body assembly, and the roof cover crossbeam includes a front roof cover crossbeam fixedly connected between the middle front inner side surface of the left enclosure and the middle front inner side surface of the right enclosure, and a rear roof cover crossbeam fixedly connected between the middle rear inner side surface of the left enclosure and the middle rear inner side surface of the right enclosure.

[0015] The beneficial effects of the present invention are:

[0016] 1. The rear floor structure manufactured by one-piece die-casting has only two parts and is highly integrated;

[0017] 2. The weight of the rear floor structure is significantly lower than that of the rear floor structure formed by first forming sheet metal and then splicing, and it has excellent lightweight performance;

[0018] 3. The casting finished product rate exceeds 90%, reducing the intermediate splicing process and greatly improving the dimensional accuracy;

[0019] 4. The rear floor frame area is changed from a hollow sheet metal closed cavity to an aluminum alloy closed solid structure filled with solid ribs, which improves rear-impact performance;

[0020] 5. The rear floor structure effectively connects the front and rear ends of the vehicle body, increasing the overall rigidity of the body-in-white and improving torsional rigidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 An exploded view of the rear floor structure of the present invention;

[0022] Figure 2 It is a diagram showing the arrangement of reinforcement ribs of the rear floor structure of the present invention;

[0023] Figure 3 An exploded view of the assembly of a safety belt mounting plate and a transition connecting longitudinal beam on the rear floor structure of the present invention;

[0024] Figure 4 A three-dimensional diagram of a rear anti-collision beam fixed at the rear end of a transition-connected longitudinal beam in the present invention;

[0025] Figure 5 An exploded view of the lower vehicle body assembly of the present invention;

[0026] Figure 6 An exploded view of the body-in-white assembly of the present invention;

[0027] Figure 7 is a three-dimensional diagram of the body-in-white assembly of the present invention;

[0028] Among them, 1 is the rear floor panel, 2 is the rear floor longitudinal beam, 3 is the rear wheel cover, 4 is the rear floor front cross beam, 5 is the middle floor, 6 is the rear floor middle cross beam, 7 is the triangular reinforcement rib, 8 is the transverse reinforcement rib, 9 is the vertical reinforcement rib, 10 is the transition connection longitudinal beam, 11 is the rear anti-collision beam, 12 is the lower body assembly, 13 is the left side wall, 14 is the right side wall, 15 is the rear wall assembly, 16 is the front roof cross beam, 17 is the rear roof cross beam, 18 is the front cabin assembly, 19 is the front floor assembly (19.1 is the front floor panel assembly, 19.2 is the front floor side longitudinal beam), 20 is the rear luggage box, 21 is the seat belt mounting plate, 22 is the body-in-white assembly, 23 is the water pattern shallow rib, 24 is the oblique triangular rib, 25 is the X-direction reinforcement rib, 26 is the Z-direction reinforcement rib, 27 is the M-shaped reinforcement rib. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0030] Embodiment 1

[0031] like Figure 1 The integrated rear floor structure shown in FIG. 2 is composed of two integrated die castings. One of the integrated die castings includes a rear floor panel 1, rear floor longitudinal beams 2 fixedly connected to the left and right sides of the rear floor panel 1, rear wheel covers 3 located on the left and right sides of the rear floor panel 1 and fixedly connected to the rear floor longitudinal beams 2, and a rear floor front cross beam 4 fixedly connected between the front ends of the rear floor longitudinal beams 2; the front bottom surface and the middle bottom surface of the die casting are respectively provided with a square frame-type reinforcing rib structure and a C-type reinforcing rib structure extending from the rear floor panel 1 to the rear wheel covers 3 on the left and right sides. The other die casting is a middle floor 5 fixed above the square frame-type reinforcing rib structure.

[0032] Embodiment 2

[0033] like Figure 2The figure shows an embodiment of a square frame-type reinforcing rib structure designed by the present invention, wherein a rear floor middle cross beam 6 arranged parallel to the rear floor front cross beam 4 is provided at the front bottom of the rear floor panel 1, and the left and right ends of the rear floor middle cross beam 6 are respectively fixedly connected to the rear floor longitudinal beams 2 on the left and right sides of the rear floor panel 1; the square frame-type reinforcing beam includes the rear floor front cross beam 4, the rear floor middle cross beam 6 and the rear floor longitudinal beam 2 located between the rear floor front cross beam 4 and the rear floor middle cross beam 6.

[0034] In order to further enhance the structural strength of the square frame type reinforcement rib structure, Figure 2 As shown, the rear floor front cross beam 4, the rear floor middle cross beam 6 and the rear floor longitudinal beam 2 located between the rear floor front cross beam 4 and the rear floor middle cross beam 6 are all arranged with triangular reinforcing ribs 7 along their respective length directions.

[0035] like Figure 1 As shown, the rear portion of the center floor 5 overlaps with the rear floor center cross beam 6 , the left and right sides of the center floor 5 overlap with the rear floor longitudinal beam 2 , and the front portion of the center floor 5 overlaps with the rear floor front cross beam 4 .

[0036] Embodiment 3

[0037] like Figure 1 FIG. 2 shows an embodiment of a C-shaped reinforcing rib structure designed by the present invention, comprising a transverse reinforcing rib 8 arranged parallel to the front cross beam 4 of the rear floor and fixedly connected to the middle of the rear floor panel 1, and two vertical reinforcing ribs 9 respectively overlapping the two ends of the transverse reinforcing rib 8 and extending upward to the top of the rear wheel housing 3. The transverse reinforcing rib 8 is arranged with triangular reinforcing ribs along the length direction.

[0038] The structural strength of the integrated rear floor is greatly improved by the above-mentioned square frame reinforcement structure and C-shaped reinforcement structure. In addition, Figure 2 As shown, the rear floor panel 1 is provided with water-patterned shallow ribs 23, which are conducive to the flow of aluminum liquid during casting. No turbulence will be generated during the molding of the integrated rear floor, which effectively improves the quality of the casting. Irregular reinforcing ribs and a M-shaped honeycomb reinforcing rib structure are also arranged inside the rear floor longitudinal beam 2 to further improve the structural strength and prevent the excessive intrusion of the car from causing harm to the passengers. The inner reinforcing ribs of the rear wheel cover 3 include X-direction reinforcing ribs 25, Z-direction reinforcing ribs 26 and M-shaped reinforcing ribs 27. The main rib direction is in the Z direction, which effectively improves the torsional stiffness of the body-in-white. The connection between the rear wheel cover 3 and the rear floor panel 1 uses oblique triangular ribs 24 to improve the structural strength of the connection.

[0039] Embodiment 4

[0040] like Figure 3 As shown, on the basis of the third embodiment, a plurality of seat belt mounting plates 21 are arranged along the width direction of the rear floor panel 1 for mounting seat belt buckles. Figure 4 As shown, the rear end of the rear floor longitudinal beam 2 is provided with a mounting groove and a bolt through hole for detachably fixing with the transition connecting longitudinal beam 10. The transition connecting longitudinal beam 10 can be inserted into the mounting groove at the rear end of the rear floor longitudinal beam 2 and fixed with bolts. The rear anti-collision beam 11 can be fixed to the rear ends of the two transition connecting longitudinal beams 10. The rear floor longitudinal beam 2 can be indirectly connected to the rear anti-collision beam 11 through the transition connecting longitudinal beam 10 to prevent the impact force of the rear anti-collision beam 11 from directly impacting the integrated rear floor structure.

[0041] Embodiment 5

[0042] like Figure 5 As shown in FIG. 7 , the body-in-white assembly with the above-mentioned integrated rear floor structure includes a lower body assembly; a side enclosure, a rear enclosure assembly 15 and a roof cross beam fixed to the lower body assembly 12. The side enclosure includes a left enclosure 13 and a right enclosure 14 fixedly connected to the left and right sides of the lower body assembly 12; the roof cross beam includes a front roof cross beam 16 fixedly connected between the middle front inner side surface of the left enclosure 13 and the middle front inner side surface of the right enclosure 14; and a rear roof cross beam 17 fixedly connected between the middle rear inner side surface of the left enclosure 13 and the middle rear inner side surface of the right enclosure 14.

[0043] The lower body assembly 12 includes a front cabin assembly 18, a front floor assembly 19 and an integrated rear floor structure which are fixedly connected in sequence from front to rear along the vehicle body direction, and a rear luggage box 20 is fixed to the rear of the integrated rear floor structure.

[0044] The front floor assembly 19 includes a front floor panel assembly 19.1 and front floor side longitudinal beams 19.2 fixedly connected to the left and right sides of the front floor panel assembly 19.1, the front end of the rear floor longitudinal beam 2 is fixedly connected to the rear end of the front floor side longitudinal beam 19.2, and the front part of the rear floor panel 1 is fixedly connected to the rear part of the front floor panel assembly 19.1.

[0045] A transition connecting longitudinal beam 10 is fixed to the rear end of the rear floor longitudinal beam 2, a rear enclosure assembly 15 is fixed between the transition connecting longitudinal beams 10, and a rear luggage box 20 is fixed in a space surrounded by the rear floor panel 1, the transition connecting longitudinal beam 10 and the rear enclosure assembly 15. The rear floor longitudinal beam 2 is indirectly connected to the rear anti-collision beam 11 through the transition connecting longitudinal beam 10, so as to prevent the impact force of the rear anti-collision beam 11 from directly impacting the integrated rear floor structure.

[0046] In summary, the integrated rear floor designed by the present invention has the following advantages and effects:

[0047] 1. The rear floor structure manufactured by one-piece die-casting has only two parts and is highly integrated;

[0048] 2. The weight of the rear floor structure is significantly lower than that of the rear floor structure formed by first forming sheet metal and then splicing, and it has excellent lightweight performance;

[0049] 3. The casting finished product rate exceeds 90%, reducing the intermediate splicing process and greatly improving the dimensional accuracy;

[0050] 4. The rear floor frame area is changed from a hollow sheet metal closed cavity to an aluminum alloy closed solid structure filled with solid ribs, which improves rear-impact performance.

[0051] The body-in-white assembly 22 with the above-mentioned integrated rear floor structure effectively connects the front and rear ends of the vehicle body through the rear floor structure, and the overall rigidity of the body-in-white assembly 22 is increased, and the torsional rigidity is also improved.

[0052] Here, it should be noted that the description of the above technical solution is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solution set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solution of the present invention is limited only by the scope of the claims. In the case of using "including", "having" and "comprising" described in this specification, another part or other parts may also be provided, and the terms used may generally be singular but may also represent plural forms. It should be noted that although the terms "first", "second", "top", "bottom", "one side", "other side", "one end", "other end", etc. may appear and be used in this specification to describe various components, these components and parts should not be limited by these terms. These terms are only used to distinguish one component and part from another component and part. For example, without departing from the scope of this specification, the first component may be referred to as the second component, and similarly, the second component may be referred to as the first component, and the components at the top and bottom may also be interchanged or converted with each other under certain circumstances; the components at one end and the other end may have the same or different performances.

[0053] Finally, it should be pointed out that the above embodiments are only representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

Claims

1. An integrated rear floor structure, characterized in that: The invention comprises a rear floor panel (1), a rear floor longitudinal beam (2) fixedly connected to the left and right sides of the rear floor panel (1), a rear wheel cover (3) located on the left and right sides of the rear floor panel (1) and fixedly connected to the rear floor longitudinal beam (2), and a rear floor front cross beam (4) fixedly connected between the front ends of the rear floor longitudinal beam (2); the rear floor panel (1), the rear floor longitudinal beam (2), the rear wheel cover (3) and the rear floor front cross beam (4) are an integrated structure, and the front bottom surface and the middle bottom surface thereof are respectively provided with a square frame-type reinforcing rib structure and a C-type reinforcing rib structure extending from the rear floor panel (1) to the rear wheel covers (3) on the left and right sides, and a middle floor (5) is fixed above the square frame-type reinforcing rib structure.

2. The integrated rear floor structure according to claim 1, characterized in that: A rear floor middle cross beam (6) is arranged at the bottom of the front end of the rear floor panel (1) and is arranged in parallel with the rear floor front cross beam (4); the left and right ends of the rear floor middle cross beam (6) are respectively fixedly connected to the rear floor longitudinal beams (2) on the left and right sides of the rear floor panel (1); the square frame reinforcement beam includes the rear floor front cross beam (4), the rear floor middle cross beam (6) and the rear floor longitudinal beam (2) located between the rear floor front cross beam (4) and the rear floor middle cross beam (6).

3. The integrated rear floor structure according to claim 2, characterized in that: The rear floor front cross beam (4), the rear floor middle cross beam (6), and the rear floor longitudinal beam (2) located between the rear floor front cross beam (4) and the rear floor middle cross beam (6) are all provided with triangular reinforcing ribs (7) along their respective length directions.

4. The integrated rear floor structure according to claim 3, characterized in that: The rear part of the middle floor (5) overlaps with the middle cross beam (6) of the rear floor, the left and right sides of the middle floor (5) overlap with the longitudinal beam (2) of the rear floor, and the front part of the middle floor (5) overlaps with the front cross beam (4) of the rear floor.

5. The integrated rear floor structure according to claim 1, characterized in that: The C-shaped reinforcing rib structure comprises a transverse reinforcing rib (8) arranged parallel to the front cross beam (4) of the rear floor and fixedly connected to the middle part of the rear floor panel (1), and two vertical reinforcing ribs (9) respectively overlapping the two ends of the transverse reinforcing rib (8) and extending upward to the top of the rear wheel cover (3).

6. The integrated rear floor structure according to claim 1, characterized in that: The rear end of the rear floor longitudinal beam (2) is provided with a transition connection structure for being detachably fixed to the transition connection longitudinal beam (10); the rear anti-collision beam (11) can be fixed to the rear end of the transition connection longitudinal beam (10); the rear floor longitudinal beam (2) can be indirectly connected to the rear anti-collision beam (11) via the transition connection longitudinal beam (10), so as to prevent the impact force received by the rear anti-collision beam (11) in the event of a collision from directly impacting the integrated rear floor structure.

7. A body-in-white assembly having an integrated rear floor structure as claimed in any one of claims 1 to 6, comprising a lower body assembly; a side panel, a rear panel assembly (15) and a roof crossbeam fixed to the lower body assembly (12), characterized in that: The lower vehicle body assembly (12) comprises a front cabin assembly (18), a front floor assembly (19) and the integrated rear floor structure which are fixedly connected in sequence from front to rear along the vehicle body direction, and a rear luggage box (20) is fixed to the rear of the integrated rear floor structure.

8. The body-in-white assembly according to claim 7, characterized in that: The front floor assembly (19) comprises a front floor panel assembly (19.1) and front floor side longitudinal beams (19.2) fixedly connected to the left and right sides of the front floor panel assembly (19.1); the front end of the rear floor longitudinal beam (2) is fixedly connected to the rear end of the front floor side longitudinal beam (19.2); and the front part of the rear floor panel (1) is fixedly connected to the rear part of the front floor panel assembly (19.1).

9. The body-in-white assembly according to claim 7, characterized in that: A transition connecting longitudinal beam (10) is fixed to the rear end of the rear floor longitudinal beam (2), the rear enclosure assembly (15) is fixed between the transition connecting longitudinal beams (10), and the rear luggage box (20) is fixed in a space enclosed by the rear floor panel (1), the transition connecting longitudinal beam (10) and the rear enclosure assembly (15).

10. The body-in-white assembly according to claim 7, characterized in that: The side enclosure comprises a left enclosure (13) and a right enclosure (14) fixedly connected to the left and right sides of the lower vehicle body assembly (12); the roof crossbeam comprises a front roof crossbeam (16) fixedly connected between the middle front inner side surface of the left enclosure (13) and the middle front inner side surface of the right enclosure (14); and a rear roof crossbeam (17) fixedly connected between the middle rear inner side surface of the left enclosure (13) and the middle rear inner side surface of the right enclosure (14).

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