Vehicle rear floor frame structure and vehicle having the same

Abstract

The present invention provides a vehicle rear floor frame structure, comprising longitudinal beams arranged on both sides of the vehicle and cross beams arranged between the longitudinal beams, the longitudinal beams comprising a front longitudinal beam, a rear longitudinal beam fixedly connected to the rear end of the front longitudinal beam and a connecting longitudinal beam for assembly with the vehicle upper body, the front longitudinal beam, the rear longitudinal beam and the cross beam are aluminum structures, the connecting longitudinal beam is a steel structure, and the connecting longitudinal beam is arranged on the outer sides of the front longitudinal beam and the rear longitudinal beam. The present invention also relates to a vehicle, which ensures the structural strength and rigidity of the rear frame of the vehicle body by using aluminum sheet metal for the front longitudinal beam, the rear longitudinal beam and the cross beam, and steel sheet metal for the connecting longitudinal beam, and by adding a connecting longitudinal beam to effectively connect the vehicle upper body and the vehicle front floor frame structure; at the same time, the problem of overweight of the steel body is solved, reflecting the design of lightweight body.

Description

Technical Field

[0001] The present invention relates to the field of vehicle bodies, and in particular to a vehicle rear floor frame structure and a vehicle having the same. Background Art

[0002] The mainstream rear floor frame structure of the current car body-in-white is made of welded steel parts. The rear floor structure is generally composed of many steel stampings, with a large number of parts, complex structure, and low assembly welding accuracy. The steel frame structure needs to add parts at the rear longitudinal beam frame of the car body to increase the joint stiffness and strength to meet the installation of chassis parts and ensure the rear-end performance. Therefore, good material selection and appropriate structural design are particularly critical. Summary of the invention

[0003] In view of this, it is necessary to provide a vehicle rear floor frame structure and a vehicle having the same that can solve the above-mentioned problems.

[0004] The present invention provides a vehicle rear floor frame structure, comprising longitudinal beams arranged on both sides of the vehicle and cross beams arranged between the longitudinal beams, the longitudinal beams comprising a front longitudinal beam, a rear longitudinal beam fixedly connected to the rear end of the front longitudinal beam and a connecting longitudinal beam for assembly with a vehicle upper body, the front longitudinal beam, the rear longitudinal beam and the cross beam are aluminum structures, the connecting longitudinal beam is a steel structure, and the connecting longitudinal beam is arranged on the outer sides of the front longitudinal beam and the rear longitudinal beam.

[0005] In one embodiment, the longitudinal beam and the transverse beam are connected by hot-melt self-tapping riveting.

[0006] In one embodiment, the front longitudinal beam is an I-shaped cast aluminum structure, the rear longitudinal beam is a closed cavity extruded aluminum structure, the connecting longitudinal beam is an L-shaped steel stamping structure, and the front longitudinal beam and the rear longitudinal beam are connected to the connecting longitudinal beam by self-piercing riveting and hot-melt self-tapping drill rivets.

[0007] In one embodiment, the crossbeam includes a first crossbeam and a second crossbeam provided at the connection between the front longitudinal beam and the connecting longitudinal beam, and a third crossbeam provided at the connection between the rear longitudinal beam and the connecting longitudinal beam, the first crossbeam, the second crossbeam and the third crossbeam are closed cavity structures formed by extruded aluminum, the second crossbeam is connected to the first crossbeam, and together with the front longitudinal beam and the connecting longitudinal beam, forms a closed force transmission cavity structure.

[0008] In one embodiment, the first cross beam includes first side plates arranged opposite to each other and a second side plate vertically arranged between the first side plates to form a parallelogram closed cavity; the second cross beam includes third side plates arranged opposite to each other and a fourth side plate obliquely arranged between the third side plates to form a square closed cavity, a first tower connecting plate extending outward is provided at a connection between the third side plate and the fourth side plate, and a second tower connecting plate tower-connected to the first tower connecting plate is provided at a connection between the first side plate and the second side plate; a fourth tower connecting plate opposite to the second tower connecting plate is provided on the first cross beam, and a third tower connecting plate opposite to the first tower connecting plate is provided on the second cross beam, and a Z-shaped force transmission channel is formed by the splicing and welding of the square closed cavity, the parallelogram closed cavity, the third tower connecting plate, the fourth tower connecting plate and the longitudinal beam.

[0009] In one embodiment, the first side plate and the third side plate are arranged horizontally, the first tower connecting plate is extended outward from the end of the fourth side plate, the first tower connecting plate is parallel to the second tower connecting plate, the third tower connecting plate is extended outward from the third side plate, and the fourth tower connecting plate is extended outward from the end of the first side plate.

[0010] In one embodiment, a subframe mounting point is formed on the front longitudinal beam, a battery mounting point is formed on the first cross beam, and a seat mounting point is formed on the second cross beam.

[0011] In one embodiment, a side panel connecting plate for connecting to a side panel wheelhouse reinforcement beam of the vehicle is provided near a connection between the rear longitudinal beam and the third cross beam, and the side panel connecting plate is located at a lower portion of a rear shock absorber region of the vehicle.

[0012] In one embodiment, the vehicle rear floor frame structure further includes a floor disposed between the longitudinal beam and the cross beam, and the floor is a planar aluminum alloy structure.

[0013] The present invention also provides a vehicle, comprising the vehicle rear floor frame structure described above.

[0014] In summary, the present invention ensures the structural strength and rigidity of the rear frame of the vehicle body by making the front longitudinal beam, the rear longitudinal beam and the cross beam of aluminum sheet metal, and the connecting longitudinal beam of steel sheet metal, and by adding connecting longitudinal beams to effectively connect the vehicle upper body and the vehicle front floor frame structure; at the same time, it solves the problem of overweight of the steel body, and embodies the lightweight design of the body.

[0015] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a specific embodiment of the vehicle rear floor frame structure of the present invention;

[0017] Figure 2 for Figure 1 A schematic diagram of the structure of the connection between the side panel connecting plate and the front longitudinal beam, the rear longitudinal beam and the connecting longitudinal beam;

[0018] Figure 3 for Figure 1 A schematic diagram of the structure of the first beam;

[0019] Figure 4 for Figure 1 A schematic diagram of the structure of the second crossbeam;

[0020] Figure 5 for Figure 1 Structural schematic diagram of the third crossbeam; Figure 6 for Figure 1 A schematic diagram of the structure of the vehicle rear floor frame structure along the front longitudinal beam and the rear longitudinal beam;

[0021] Figure 7 It is a schematic diagram of the structure of the first crossbeam with a battery mounting point. DETAILED DESCRIPTION

[0022] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the present invention is described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0023] like Figure 1 to Figure 7 As shown, the present invention provides a vehicle rear floor frame structure, including longitudinal beams 11 arranged on both sides of the vehicle and cross beams 12 arranged between the longitudinal beams 11, and the longitudinal beams 11 and the cross beams 12 are connected by hot melt self-tapping drill rivets (FDS) to form the vehicle rear floor frame structure.

[0024] Among them, Figure 1 and Figure 2 As shown, the longitudinal beam 11 includes a front longitudinal beam 11a, a rear longitudinal beam 11b fixed to the rear end of the front longitudinal beam 11a, and a connecting longitudinal beam 11c arranged on the outside of the front longitudinal beam 11a and the rear longitudinal beam 11b. The front longitudinal beam 11a, the rear longitudinal beam 11b and the cross beam 12 are aluminum structures, and the connecting longitudinal beam 11c is a steel structure.

[0025] The front longitudinal beam 11a is an I-shaped cast aluminum structure, so there is no need to worry about the material utilization rate of stamping parts design; and the two sides of the front longitudinal beam 11a are hollowed out to provide higher bending resistance and achieve the best weight reduction effect. The rear longitudinal beam 11b is a closed cavity extruded aluminum structure, that is, the main frame of the present invention adopts extruded aluminum, with flexible cross-sectional design, high integration of parts, small number, effective reduction of vehicle weight and optimal utilization of materials and space based on different performances; it can be understood that the present invention effectively reduces the number and weight of structural parts and improves the splicing accuracy of the vehicle rear floor frame structure by adopting aluminum alloy extrusion process and aluminum alloy casting process.

[0026] In more detail, the connecting longitudinal beam 11c is an L-shaped steel stamping plate structure that is spot-welded to the steel upper body of the vehicle. The front longitudinal beam 11a and the rear longitudinal beam 11b are connected to the connecting longitudinal beam 11c by self-piercing riveting (SPR) and hot-melt self-tapping drill rivets (FDS), which meet the connection requirements of the steel upper body (steel-aluminum hybrid body), effectively connect the vehicle upper body and the vehicle front floor frame structure, and ensure the structural strength and rigidity of the rear body frame; at the same time, it solves the problem of overweight of the steel body and embodies the lightweight design of the body. In a preferred embodiment, the connecting longitudinal beam 11c extends away from the ends of the front longitudinal beam 11a and the rear longitudinal beam 11b toward the direction of the vehicle upper body (focus on reference Figure 1 and Figure 2 ).

[0027] Specifically, when the longitudinal beam 11 and the cross beam 12 in the present invention are connected to various components on the vehicle body, if the two connecting parts are aluminum-aluminum or aluminum-steel structures, the connection method can also be selected from aluminum spot welding, or screw connection, or structural adhesive combined with self-tapping drill rivets (FDS), or structural adhesive combined with self-piercing rivets (SPR) and other connection methods.

[0028] like Figure 2 to Figure 5 The cross beam 12 includes a first cross beam 12a and a second cross beam 12b which are arranged at the connection between the front longitudinal beam 11a and the connecting longitudinal beam 11c, and a third cross beam 12c which is arranged at the connection between the rear longitudinal beam 11b and the connecting longitudinal beam 11c. The cross beams 12 (the first cross beam 12a, the second cross beam 12b and the third cross beam 12c) are extruded aluminum structures with a closed cavity structure, and the second cross beam 12b is located between the first cross beam 12a and the second cross beam 12b. The front longitudinal beam 11a of the cast aluminum structure overlaps with the first cross beam 12a and the second cross beam 12b of the extruded aluminum structure to form a closed force transmission cavity structure to form various force transmission channels. This structure has high integration and high precision, reduces the weight of parts and reduces manufacturing costs, can ensure that the rear floor frame has higher rigidity, has better resistance to body torsion and processability, and solves the problem of easy corrosion of the steel body.

[0029] Key References Figure 3 , Figure 4 , Figure 5 and Figure 6 In the present invention, the third crossbeam 12c is a square closed cavity structure; the first crossbeam 12a includes a first side plate 12g arranged opposite to each other and a second side plate 12d vertically arranged between the first side plates 11 to form a parallelogram closed cavity; the second crossbeam 12b includes a third side plate 12e arranged opposite to each other and a fourth side plate 12f inclined between the third side plates 12e to form a square closed cavity, a first tower connecting plate 121 extending outward is provided at a connection between the third side plate 12e and the fourth side plate 12f, and a second tower connecting plate 121 connected to the first tower connecting plate 121 is provided at a connection between the first side plate 12g and the second side plate 12d. a connecting plate 122; a fourth tower connecting plate 124 opposite to the second tower connecting plate 122 is provided on the first cross beam 12a, and a third tower connecting plate 123 opposite to the first tower connecting plate 121 is provided on the second cross beam 12b. The square closed cavity, the parallelogram closed cavity, the third tower connecting plate 123, the fourth tower connecting plate 124 and the longitudinal beam 11 (mainly the front longitudinal beam 11a and the connecting longitudinal beam 11c) are welded together to form a Z-shaped force transmission channel, so that the collision force can be transmitted to the first cross beam 12a and the second cross beam 12b through the front longitudinal beam 11a, and the impact of the collision force on the rear floor frame of the vehicle can be effectively dispersed.

[0030] In a preferred embodiment, the first side plate 12g and the third side plate 12e are arranged horizontally, the first tower connecting plate 121 is formed by extending outward from the end of the fourth side plate 12f, the first tower connecting plate 121 is parallel to the second tower connecting plate 122, the third tower connecting plate 123 is formed by extending outward from the third side plate 12e, and the fourth tower connecting plate 124 is formed by extending outward from the end of the first side plate 12g. At this time, the channel formed by the tower connection of the first cross beam 12a and the second cross beam 12b is more direct and effective in transmitting the collision force. In other embodiments, the first side plate 12g is not limited to Figure 3 The position of the second side plate 12d can also be interchanged with the second side plate 12d.

[0031] Key References Figure 6 A sub-frame mounting point 125 facing the vehicle sub-frame is formed on the front longitudinal beam 11a. The sub-frame mounting point 125 provided by the present invention corresponds to the force transmission channel of the closed force transmission cavity structure formed by the first cross beam 12a and the second cross beam 12b, thereby improving the strength (rigidity) of the sub-frame mounting point 125; at the same time, referring to Figure 2 and Figure 7 The first cross beam 12a provided by the present invention is formed with a battery mounting point 126, and the second cross beam 12b is formed with a seat mounting point 127, so as to ensure that the battery mounting point 126 and the seat mounting point 127 have higher rigidity.

[0032] In the present invention, a side panel connecting plate 13 for connecting the side panel wheelhouse reinforcement beam of the vehicle is provided near the connection between the third cross beam 12c and the rear longitudinal beam 11b. The side panel connecting plate 13 is located at the lower part of the rear shock absorber area of ​​the vehicle ( Figure 1 Near one end of the middle connecting longitudinal beam 11c close to the third cross beam 12c, Figure 2 In one specific embodiment, the side enclosure connecting plate 13 is arranged on the same side of the rear longitudinal beam 11c as the connecting longitudinal beam 11c, and the side enclosure connecting plate 13 is connected to the rear longitudinal beam 11b by bolts, and the side enclosure connecting plate 13 is also assembled and connected to the side enclosure wheel house reinforcement beam correspondingly, so as to form the ability to resist the reverse deformation transmitted by the shock absorber.

[0033] Furthermore, the vehicle rear floor frame structure also includes a floor 14 disposed between the longitudinal beam 11 and the cross beam 12. In the present invention, the floor 14 is a planar aluminum alloy aluminum plate structure, and the vehicle rear enclosure is a steel structure, and a better force transmission path is formed through the design of a coherent casting structure.

[0034] The present invention also provides a vehicle, comprising the above vehicle rear floor frame structure. For details on the connection between the vehicle rear floor frame structure and the vehicle, reference may be made to the prior art, and no further details will be given here.

[0035] In the present invention, when a vehicle with a vehicle rear floor frame structure collides from behind, the collision force is transmitted from the rear longitudinal beam to the front longitudinal beam, and a part of the force is transmitted upward through the floor side panel connection bracket.

[0036] When a vehicle with a vehicle rear floor frame structure collides from the side, the collision force is transmitted from the vehicle door sill to the front longitudinal member, the first cross member, and the second cross member.

[0037] In summary, the present invention adopts aluminum sheet metal for the front longitudinal beam, the rear longitudinal beam and the cross beam, and steel sheet metal for the connecting longitudinal beam, and at the same time, effectively connects the vehicle upper body and the vehicle front floor frame structure by adding a connecting longitudinal beam, thereby ensuring the structural strength and rigidity of the rear frame of the vehicle body; at the same time, it solves the problem of overweight of the steel body and embodies the lightweight design of the vehicle body; at the same time, the front longitudinal beam is further made of cast aluminum structure, the cross beam and the rear longitudinal beam are made of closed cavity aluminum alloy extrusion structure, and the first cross beam and the second cross beam are connected to form a better force transmission path, so as to effectively reduce the number and weight of parts through extrusion process and casting process, and improve the structural strength / rigidity of the rear floor; and through the connection methods of self-piercing riveting (SPR) and hot-melt self-tapping drill rivet (FDS), the overall assembly of the vehicle rear floor frame structure that meets the lightweight level is completed.

[0038] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A vehicle rear floor frame structure, characterized in that: The invention comprises longitudinal beams (11) arranged on both sides of a vehicle and a cross beam (12) arranged between the longitudinal beams (11); the longitudinal beams (11) comprise a front longitudinal beam (11a), a rear longitudinal beam (11b) fixedly connected to the rear end of the front longitudinal beam (11a), and a connecting longitudinal beam (11c) used for assembly with a vehicle body; the front longitudinal beam (11a), the rear longitudinal beam (11b) and the cross beam (12) are aluminum structures; the connecting longitudinal beam (11c) is a steel structure; the connecting longitudinal beam (11c) is arranged between the front longitudinal beam and the rear longitudinal beam. The cross beam (12) includes a first cross beam (12a) and a second cross beam (12b) provided at the connection between the front longitudinal beam (11a) and the connecting longitudinal beam (11c), and a third cross beam (12c) provided at the connection between the rear longitudinal beam (11b) and the connecting longitudinal beam (11c); the first cross beam (12a) includes first side plates (12g) provided opposite to each other and a first side plate (12g) provided vertically between the first side plates (12g) to form a parallelogram The second crossbeam (12b) comprises a third side plate (12e) arranged opposite to each other and a fourth side plate (12f) arranged obliquely between the third side plates (12e) to form a square closed cavity, a first tower connecting plate (121) extending outward is provided at a connection between the third side plate (12e) and the fourth side plate (12f), and a tower connected to the first tower connecting plate (121) is provided at a connection between the first side plate (12g) and the second side plate (12d). ) is provided with a second tower connecting plate (122); the first cross beam (12a) is provided with a fourth tower connecting plate (124) opposite to the second tower connecting plate (122); the second cross beam (12b) is provided with a third tower connecting plate (123) opposite to the first tower connecting plate (121); and a Z-shaped force transmission channel is formed by the splicing and welding of the square closed cavity, the parallelogram closed cavity, the third tower connecting plate (123), the fourth tower connecting plate (124) and the longitudinal beam (11).

2. The vehicle rear floor frame structure according to claim 1, characterized in that: The longitudinal beam (11) and the cross beam (12) are connected by hot-melt self-tapping riveting.

3. The vehicle rear floor frame structure according to claim 1, characterized in that: The front longitudinal beam (11a) is an I-shaped cast aluminum structure, the rear longitudinal beam (11b) is a closed cavity extruded aluminum structure, the connecting longitudinal beam (11c) is an L-shaped steel stamping plate structure, and the front longitudinal beam (11a) and the rear longitudinal beam (11b) are connected to the connecting longitudinal beam (11c) by self-piercing riveting and hot-melt self-tapping drill riveting.

4. The vehicle rear floor frame structure according to claim 3, characterized in that: The first cross beam (12a), the second cross beam (12b) and the third cross beam (12c) are closed cavity structures formed by extruding aluminum; the second cross beam (12b) is connected to the first cross beam (12a) and forms a closed force transmission cavity structure together with the front longitudinal beam (11a) and the connecting longitudinal beam (11c).

5. The vehicle rear floor frame structure according to claim 1, characterized in that: The first side plate (12g) and the third side plate (12e) are arranged horizontally, the first tower connecting plate (121) is formed by extending outward from the end of the fourth side plate (12f), the first tower connecting plate (121) is parallel to the second tower connecting plate (122), the third tower connecting plate (123) is formed by extending outward from the third side plate (12e), and the fourth tower connecting plate (124) is formed by extending outward from the end of the first side plate (12g).

6. The vehicle rear floor frame structure according to claim 1 or 4, characterized in that: A subframe mounting point (125) is formed on the front longitudinal beam (11a), a battery mounting point (126) is formed on the first cross beam (12a), and a seat mounting point (127) is formed on the second cross beam (12b).

7. The vehicle rear floor frame structure according to claim 1, characterized in that: A side enclosure connecting plate (13) for connecting the vehicle side enclosure wheelhouse reinforcement beam is provided near the connection between the rear longitudinal beam (11b) and the third cross beam (12c), and the side enclosure connecting plate (13) is located at the lower part of the vehicle rear shock absorber area.

8. The vehicle rear floor frame structure according to claim 1, characterized in that: The vehicle rear floor frame structure also includes a floor (14) arranged between the longitudinal beam (11) and the cross beam (12), and the floor (14) is an aluminum alloy structure with a planar structure.

9. A vehicle, characterized in that: The vehicle rear floor frame structure comprises the vehicle rear floor frame structure as described in any one of claims 1 to 8.

Images