Integrated rear floor framework structure and vehicle

Abstract

The application discloses an integrated rear floor framework structure and a vehicle, characterized in that: the structure comprises six parts: a front cross beam, a middle cross beam, a rear cross beam, a left longitudinal beam, a right longitudinal beam and a middle rear longitudinal beam; the six parts are integrally formed by being spliced and welded and then being one-time formed by heating to form an integrated rear floor framework; a structure corner of the integrated rear floor framework is provided with a round corner transition, the radius of the round corner is at least 80 degrees, and a triangular surface transition is arranged between the side surface of the corner and the flanges on both sides of the bottom edge. The design of the integrated rear floor framework structure brings revolutionary changes to the automobile industry, promotes the continuous progress of automobile technology, and meets the pursuit of consumers for high-performance, safe and environmentally-friendly automobiles through multiple advantages such as lightweight, safety improvement, cost optimization, and improvement of appearance and space utilization.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle body structure, in particular to an integrated rear floor framework structure. BACKGROUND

[0002] In the global context, the increasingly stringent environmental regulations have prompted automakers to reduce the carbon emissions of vehicles, and lightweighting is one of the key approaches to achieve this goal. At the same time, the high demand of consumers for vehicle safety performance makes it necessary for automotive structural design to reduce weight while ensuring the occupant protection capability of the vehicle in various crash situations.

[0003] The rear floor framework, as an important component of the vehicle body structure, its design directly affects the weight distribution, strength and crash safety performance of the vehicle. The integrated rear floor framework structure design, as an important direction of vehicle body structure innovation, aims to significantly reduce the weight of the vehicle body through integrated design, while improving the structural stiffness and crash safety. The traditional rear floor framework design usually adopts a split structure, which is welded from multiple components, which not only increases the manufacturing complexity and weight, but also may affect the overall safety in the event of weld point failure in the crash. In contrast, the integrated design can achieve lightweighting and strength enhancement of the structure by reducing the connection points and optimizing the use of materials, thereby improving the overall performance of the vehicle.

[0004] In the conventional integrated structure, the forming of the product corner is a difficult problem for technical personnel. The conventional way is to increase the R angle of the corner and increase the draft angle of the side surface. However, on the rear floor framework structure, due to the small arrangement space, it is not convenient to increase the draft angle of the beam and the longitudinal beam surface, so the problem needs to be researched and overcome. SUMMARY

[0005] The purpose of the present application is to provide an integrated rear floor framework structure to solve the problems raised in the background art.

[0006] To achieve the above purpose, the present application provides the following technical solution: an integrated rear floor framework structure, comprising a front cross beam, a middle cross beam, a rear cross beam, a left longitudinal beam, a right longitudinal beam and a middle rear longitudinal beam.

[0007] The six-part structure raw material is welded to form a whole, and then one-time forming is performed through heating to form an integrated rear floor framework.

[0008] The structure corner of the integrated rear floor framework adopts a round corner transition, and the radius of the round corner is at least 80°, and a triangular surface transition is provided between the side surface of the corner and the flanges on both sides of the bottom edge.

[0009] Preferably, the draft angle of the two side surfaces of the integrated rear floor framework structure is between 5° and 30°.

[0010] Preferably, the corner of the integrated rear floor framework structure is thinned by 0.12-0.15.

[0011] Preferably, a transition surface is arranged at the corner.

[0012] Preferably, the material of the integrated rear floor framework is defined as 22MnB5, and the thickness is 1.2mm, 1.4mm and 1.8mm.

[0013] Preferably, the raw material is formed into an integrated body by laser welding, and the material edge and hole are processed by laser cutting after hot working.

[0014] Preferably, the front cross beam is provided with two rows of seat mounting holes connected with safety belts, and mounting points of a thermal management module.

[0015] Preferably, the rear cross beam is provided with a thermal management module and mounting points of three rows of seats, and the rear longitudinal beam is used for lap joint with a rear wall assembly.

[0016] Preferably, the left longitudinal beam and the right longitudinal beam are provided with two rows of seat mounting holes, body bumpers and three rows of safety belt mounting holes.

[0017] A vehicle applying the integrated rear floor framework structure.

[0018] Compared with the prior art, the beneficial effects of the present application are: the design of the integrated rear floor framework structure has multiple advantages of lightweight, safety improvement, cost optimization, and improvement of appearance and space utilization, etc., which brings revolutionary changes to the automobile industry, promotes the continuous progress of automobile technology, and meets the pursuit of consumers for high-performance, safe and environmentally friendly automobiles.

[0019] By increasing the corner R angle radius and adding the bottom triangular transition surface, the cross section at the corner is improved, the forming problem is solved, and the strength of this place is strengthened, and the space occupation is smaller than the traditional solution. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the present application;

[0021] Figure 2 is a corner structure schematic Figure One ;

[0022] Figure 3 is a corner structure schematic Figure Two ;

[0023] Figure 4 is a corner structure schematic Figure Three . DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0025] As shown in the drawings, Figures 1-3 The present application provides a technical solution: an integrated rear floor framework structure includes a front cross beam 1 suspendedly installed, a middle cross beam 2 installed with two rows of seats and safety belts, a rear cross beam 3 installed with three rows of seats, left and right longitudinal beams 4 and 5 installed with body bumpers and three rows of safety belts, and a middle rear longitudinal beam 6 jointed with a rear wall assembly;

[0026] The front cross beam 1 part of the integrated rear floor framework is provided with 2 mounting holes connected with the suspension, and 4 plug welding holes of the suspension reinforcement plate at the same time, the middle cross beam 2 is provided with 4 mounting holes connected with two rows of seats and two rows of safety belts, and 2 mounting points of the thermal management module, the rear cross beam 3 is provided with 2 mounting points of the thermal management module, the left and right longitudinal beams are provided with 6 mounting holes connected with two rows of seats, body bumpers and three rows of safety belts, and the middle rear longitudinal beam 6 is provided with 1 mounting hole of the thermal management module;

[0027] The material of the integrated rear floor framework is defined as the hot forming material of 22MnB5, the thickness is 1.2mm / 1.4mm / 1.8mm, the front cross beam 1, the middle cross beam 2, the rear cross beam 3, the left longitudinal beam 4, the right longitudinal beam 5 and the middle rear longitudinal beam 6 are laser welded from the raw material into a whole, and then one-time forming is performed through heating, and the material edge and the hole are finally realized through laser cutting to obtain the part product;

[0028] The structure corner of the integrated rear floor framework adopts a round corner transition, the radius of the round corner is at least 80°, and a triangular surface transition is arranged between the side surface of the corner and the flanges on both sides of the bottom edge. The conventional round corner radius is generally between 40-50, and the draft angle of the inclined surface on both sides is generally about 5°. If direct hot forming is performed, the thinning rate at this place is between 0.2-0.3, and there is a risk of cracking. Referring to Figures 2-4 As shown in the drawings, the radius of the round corner a at the corner is increased to more than 80, the area section at the corner is increased, and a smooth triangular transition surface c is arranged at the bottom. The triangular transition surface c referred to herein is not a standard triangular structure, but a triangular connection relationship between the corner and the flanges on both sides of the bottom edge. This design can help to reduce the thinning rate at this place to 0.12-0.15, and the forming is significantly improved. On this basis, a transition surface b is further arranged on the side edge, as shown in the drawings, which presents a certain stepped transition structure, further reducing the forming difficulty.

[0029] On the basis of the above improvement, the draft angle is increased again, and in some areas depending on the specific structure, the draft angle can be increased from 5° to 10° or 15°, and in practical applications, the maximum can be increased to 30°. Thus, the forming problem is further improved.

[0030] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely divergences of the principles and specific embodiments of the application and that numerous modifications, changes, substitutions, and alterations can be made thereto without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. An integrated rear floor frame structure, characterized in that: It consists of six structural parts: front crossbeam, middle crossbeam, rear crossbeam, left longitudinal beam, right longitudinal beam, and middle and rear longitudinal beam; The floor frame is formed by welding together six structural materials and then heating them in one go to create an integrated floor frame. The corners of the integrated floor frame structure are rounded, with a radius of at least 80°. A triangular transition is provided between the side of the corner and the two flanges on the bottom edge. The draft angles of the two inclined surfaces of the integrated floor frame structure are between 15° and 30°. The thinning rate at the corners of the integrated floor frame structure is between 0.12 and 0.

15. A transition surface is provided at the side of the corner.

2. The integrated rear floor frame structure according to claim 1, characterized in that: The material for the integrated floor frame is defined as 22MnB5, with a thickness of 1.2mm, 1.4mm, or 1.8mm.

3. The integrated rear floor frame structure according to claim 1, characterized in that: The raw materials are laser-welded together, and after thermal processing, the edges and holes are laser-cut.

4. The integrated rear floor frame structure according to claim 1, characterized in that: The front crossbeam is equipped with mounting holes for connecting the second-row seats and second-row seat belts, as well as mounting points for the thermal management module.

5. The integrated rear floor frame structure according to claim 4, characterized in that: The rear crossbeam is equipped with a thermal management module and mounting points for the three rows of seats, while the middle and rear longitudinal beams are used to connect with the rear bulkhead assembly.

6. The integrated rear floor frame structure according to claim 5, characterized in that: The left and right longitudinal beams are equipped with mounting holes for the second-row seats, body buffer blocks, and third-row seat belts.

7. A vehicle, characterized in that: An integrated rear floor frame structure as described in any one of claims 1-6 is applied.

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