Vehicle body rear assembly for vehicle and vehicle

Abstract

The utility model discloses a vehicle body rear assembly used for a vehicle and the vehicle, the vehicle body rear assembly comprises a vehicle body longitudinal beam, a rear bumper mounting plate and a reinforcing piece, and the surface, facing the interior of the vehicle, of the rear bumper mounting plate is connected to the end of the vehicle body longitudinal beam; at least part of the reinforcing part is attached to the surface of the rear bumper mounting plate, at least the other part of the reinforcing part wraps at least part of the periphery of the end of the vehicle body longitudinal beam, and the reinforcing part is detachably connected with the vehicle body longitudinal beam and the rear bumper mounting plate. According to the vehicle body rear assembly, when different market configuration requirements are met, trailer requirements or common configuration can be rapidly met through the detachable reinforcing piece without changing the vehicle body main body structure, unnecessary cost input is avoided, meanwhile, the product development period is shortened, and the production efficiency and economic benefits of enterprises are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of vehicle, especially a vehicle body rear assembly for vehicle and vehicle. BACKGROUND

[0002] Different markets and regions have different requirements for vehicles and market configurations. In order to meet the diversified market configuration needs and the platform development strategy of the vehicle enterprise, the target design of the automobile parts often needs to cover all market requirements. However, this unified design method exposes many problems in actual application, increasing the production cost and resource waste of enterprises.

[0003] In the related art, the vehicle body rear structure lacks flexibility and versatility when responding to different market configuration needs. When the vehicle body rear needs to be strengthened to adapt to specific needs such as a trailer, the entire structure often needs to be extensively modified and adjusted, which not only increases the design and production cost, but also prolongs the product development cycle. SUMMARY

[0004] The utility model aims at at least solving one of the technical problems existing in the prior art. Therefore, one purpose of the utility model is to provide a vehicle body rear assembly for vehicle. The vehicle body rear assembly according to the utility model embodiment can quickly adapt to the trailer demand or the ordinary configuration without changing the vehicle body main structure through the detachable reinforcing member when responding to different market configuration needs, avoiding unnecessary cost investment, shortening the product development cycle, and improving the production efficiency and economic benefit of enterprises.

[0005] The utility model further provides a vehicle with the above-mentioned vehicle body rear assembly.

[0006] The vehicle body rear assembly according to the utility model is used for vehicle, and the vehicle body rear assembly comprises a vehicle body longitudinal beam, a rear bumper mounting plate, a surface of the rear bumper mounting plate connected to an end of the vehicle body longitudinal beam towards the inside of the vehicle, a reinforcing member, at least part of the reinforcing member fitted to the surface of the rear bumper mounting plate, at least another part of the reinforcing member wrapped around at least part of the outer periphery of the end of the vehicle body longitudinal beam, and the reinforcing member detachably connected with the vehicle body longitudinal beam and the rear bumper mounting plate respectively.

[0007] According to the rear body assembly of the utility model, at least part of the reinforcing part is attached to the surface of the rear bumper mounting plate, which can effectively enhance the local strength and rigidity of the area where the rear bumper mounting plate is located, and improve the ability of the part to withstand external force. At least another part of the reinforcing part is wrapped around at least part of the outer periphery of the vehicle body longitudinal beam end, further strengthening the load bearing capacity of the vehicle body longitudinal beam end, so that it can better cope with the towing force generated under specific working conditions such as towing. The reinforcing part is detachably connected with the vehicle body longitudinal beam and the rear bumper mounting plate, which gives the rear body assembly high flexibility and versatility. When the vehicle has specific needs such as towing, the reinforcing part can be conveniently installed to meet the needs. When the vehicle does not need the reinforcing function, the reinforcing part can be easily removed, avoiding unnecessary cost investment, and greatly shortening the product development cycle and improving the production efficiency and economic benefit of the enterprise.

[0008] According to some embodiments of the utility model, the reinforcing part comprises: a bottom plate attached to the surface of the rear bumper mounting plate, the bottom plate being formed with a first connecting part suitable for detachable connection with the rear bumper mounting plate; a side plate connected to the edge of the bottom plate and extending in a direction perpendicular to the surface of the bottom plate, the side plate being wrapped around at least part of the outer periphery of the vehicle body longitudinal beam end, the side plate being formed with a second connecting part suitable for detachable connection with the vehicle body longitudinal beam.

[0009] According to some embodiments of the utility model, the side plate comprises: a first side plate and a second side plate, the first side plate and the second side plate being arranged in a width direction of the vehicle, the first side plate and the second side plate being wrapped around the two side surfaces of the vehicle body longitudinal beam end respectively; a third side plate, both ends of the third side plate being connected to the first side plate and the second side plate respectively, the third side plate being wrapped around the lower surface of the vehicle body longitudinal beam end.

[0010] According to some embodiments of the utility model, the first side plate and the second side plate are arranged symmetrically with each other in the width direction of the vehicle, and the second connecting parts provided by the first side plate and the second side plate are arranged symmetrically with each other in the width direction of the vehicle.

[0011] According to some embodiments of the utility model, the first side plate is formed with a gradual change section connected with the third side plate, the gradual change section gradually decreasing in height in the direction towards the third side plate.

[0012] According to some embodiments of the utility model, the gradual change section and the third side plate are smoothly and transitionally connected.

[0013] According to some embodiments of the present application, the rear bumper mounting plate is formed with a weight-reducing hole; the bottom plate is formed with an inner edge and an outer edge connected to each other, the inner edge is connected to the side plate, and the outer edge is formed with a curvedly extended avoiding edge, the avoiding edge is arranged in a spaced manner with the edge of the weight-reducing hole and surrounds at least a part of the outer periphery of the weight-reducing hole.

[0014] According to some embodiments of the present application, the reinforcing member is configured as a sheet metal stamping part.

[0015] According to some embodiments of the present application, an outer surface of the reinforcing member is provided with a protective coating.

[0016] A vehicle according to the present application is briefly described below.

[0017] The vehicle according to the present application comprises the rear body assembly in any one of the above embodiments. Since the vehicle according to the present application comprises the rear body assembly in any one of the above embodiments, the vehicle according to the present application has the rear body assembly which can be flexibly adapted to different configuration requirements, and ensures the strength of the body while taking into account the production economy and maintenance convenience.

[0018] Additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the following drawings in which:

[0020] Figure 1 is a structure schematic view of a rear bumper mounting plate and a reinforcing member cooperating with each other of a rear body assembly according to one embodiment of the present application;

[0021] Figure 2 is a front schematic view of a rear bumper mounting plate and a reinforcing member cooperating with each other of a rear body assembly according to one embodiment of the present application;

[0022] Figure 3 is a layout plane schematic view of a rear body assembly on a vehicle according to one embodiment of the present application;

[0023] Figure 4 is a layout structure schematic view of a rear body assembly on a vehicle according to one embodiment of the present application.

[0024] REFERENCE NUMERALS:

[0025] 1, rear body assembly;

[0026] 11. rear bumper mounting plate, 111. weight reduction hole;

[0027] 12. reinforcement;

[0028] 121. bottom plate, 1211. first connecting part, 1212. inner edge, 1213. outer edge, 1213a. avoiding edge;

[0029] 122. side plate, 1221. second connecting part, 1222. first side plate, 1222a. gradual change section, 1223. second side plate, 1224. third side plate. DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as a limitation of the present application.

[0031] In the description of the present application, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0032] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In related technologies, the rear structure of the vehicle body lacks flexibility and versatility in meeting the needs of different market configurations. When the rear of the vehicle body needs to be reinforced to meet specific requirements such as trailers, large-scale modifications and adjustments to the entire structure are often required, which not only increases design and production costs but also prolongs the product development cycle.

[0034] The following is for reference. Figure 1 and Figure 2 Description of the rear vehicle body component 1 according to an embodiment of the present utility model.

[0035] like Figure 1 and Figure 2 As shown, the rear body assembly 1 according to this utility model is used in a vehicle. The rear body assembly 1 includes a longitudinal body beam and a rear bumper mounting plate 11. The longitudinal body beam extends along the length of the vehicle, providing longitudinal structural support. The rear bumper mounting plate 11 is a component connecting the rear bumper and the longitudinal body beam. The interior-facing surface of the rear bumper mounting plate 11 is connected to the end of the longitudinal body beam, providing a mounting position for the rear bumper. This allows the rear bumper to be securely fixed to the vehicle body and facilitates its removal and replacement when needed, improving the convenience of vehicle maintenance.

[0036] The rear vehicle assembly 1 also includes a reinforcing member 12. At least a portion of the reinforcing member 12 is attached to the surface of the rear bumper mounting plate 11, effectively enhancing the local strength and rigidity of the area where the rear bumper mounting plate 11 is located, and improving the ability of this part to withstand external forces. At least another portion of the reinforcing member 12 covers at least a portion of the outer periphery of the end of the vehicle longitudinal beam, further strengthening the load-bearing capacity of the end of the vehicle longitudinal beam, enabling it to better cope with the towing forces generated under specific working conditions such as trailers. The reinforcing member 12 is detachably connected to both the vehicle longitudinal beam and the rear bumper mounting plate 11, giving the rear vehicle assembly 1 a high degree of flexibility and versatility. When the vehicle has specific needs such as trailers, the reinforcing member 12 can be easily installed to meet the requirements; when the vehicle does not need this reinforcement function, the reinforcing member 12 can be easily removed, avoiding unnecessary cost investment, while shortening the product development cycle and improving the company's production efficiency and economic benefits.

[0037] Therefore, according to the present utility model, the rear vehicle assembly 1 can quickly adapt to trailer requirements or ordinary configurations without modifying the main body structure by means of the detachable reinforcement 12 when dealing with different market configuration needs, thus avoiding unnecessary cost investment, shortening the product development cycle, and improving the company's production efficiency and economic benefits.

[0038] According to some embodiments of this utility model, such as Figure 1 and Figure 2As shown, the reinforcing member 12 includes a base plate 121 and a side plate 122. The base plate 121 is attached to the surface of the rear bumper mounting plate 11, and has a first connecting portion 1211 suitable for detachable connection with the rear bumper mounting plate 11. This allows for a stable and convenient detachable connection between the reinforcing member 12 and the rear bumper mounting plate 11, enhancing the local strength and rigidity of the area where the rear bumper mounting plate 11 is located, and effectively improving the ability of this part to withstand external forces. The side plate 122 is connected to the edge of the base plate 121 and extends in a direction perpendicular to the surface of the base plate 121. The side plate 122 covers at least a portion of the outer periphery of the end of the vehicle longitudinal beam, and has a second connecting portion 1221 suitable for detachable connection with the vehicle longitudinal beam, further strengthening the load-bearing capacity of the end of the vehicle longitudinal beam. This allows the end of the vehicle longitudinal beam to better cope with the towing force generated under specific working conditions such as trailers.

[0039] Through the synergistic effect of the base plate 121 and the side plate 122, the reinforcement 12 not only optimizes the force transmission path between the rear bumper mounting plate 11 and the longitudinal beam of the vehicle body, but also improves the deformation resistance of the local structure, ensuring that it can maintain stable performance under extreme working conditions.

[0040] The reinforcing component 12 is detachably connected to the rear bumper mounting plate 11 and the body longitudinal beam via the base plate 121 and the side plate 122, respectively. This allows the reinforcing component 12 to be selectively installed to meet different market configuration requirements. This enables flexible fulfillment of the needs of ordinary configurations or special working conditions such as trailers without altering the main body structure. It ensures the cost advantage of the base model while quickly adapting to specific functional requirements, shortening the product development cycle and improving the versatility of the production line and assembly efficiency.

[0041] According to some embodiments of this utility model, the first connecting part 1211 and the second connecting part 1221 are respectively configured as mounting holes. The mounting holes are adapted to SPR (Self-Piercing Riveting) and FDS (Flow Drill Screw) riveting technologies to achieve a high-strength connection between the reinforcing member 12 and the rear bumper mounting plate 11 and the vehicle body longitudinal beam. SPR technology uses a special rivet to penetrate the plate under pressure and form a mechanical interlock, which can complete the connection without pre-drilling. It has the advantages of simple process, high connection strength and no thermal deformation. FDS technology uses a high-speed rotating self-tapping screw to penetrate the metal plate and form a threaded connection, which is particularly suitable for the combination of components of different materials or difficult to weld.

[0042] By adopting SPR or FDS riveting technology, the assembly process is simplified, and the overall rigidity and fatigue resistance of the rear body component 1 are improved while ensuring structural strength.

[0043] According to some embodiments of this utility model, such as Figure 1As shown, the side panel 122 includes a first side panel 1222, a second side panel 1223, and a third side panel 1224. The first side panel 1222 and the second side panel 1223 are spaced apart in the width direction of the vehicle and respectively cover the two side surfaces of the end of the vehicle body longitudinal beam. The two ends of the third side panel 1224 are respectively connected to the first side panel 1222 and the second side panel 1223 and cover the lower surface of the end of the vehicle body longitudinal beam. Through the coordinated cooperation of the first side panel 1222, the second side panel 1223, and the third side panel 1224, multi-directional covering and reinforcement of the end of the vehicle body longitudinal beam is achieved, so that the end of the vehicle body longitudinal beam can achieve uniform force distribution when subjected to drag force or impact load.

[0044] The first side plate 1222 and the second side plate 1223 are tightly attached to the two side surfaces of the end of the longitudinal beam of the vehicle body, forming effective lateral support for the longitudinal beam and improving the bending and torsional resistance of the end of the longitudinal beam. The two ends of the third side plate 1224 are connected to the first side plate 1222 and the second side plate 1223 respectively, and cover the lower surface of the end of the longitudinal beam of the vehicle body. This not only improves the three-dimensional protective structure of the end of the longitudinal beam of the vehicle body, but also enhances the load-bearing capacity of the longitudinal beam of the vehicle body in the vertical direction.

[0045] Furthermore, an insertion groove can be defined between the first side plate 1222, the second side plate 1223, and the third side plate 1224 to engage with the end of the vehicle body longitudinal beam. The contour of the insertion groove matches the shape of the end of the vehicle body longitudinal beam, achieving precise positioning and a tight fit. The formation of the insertion groove allows the reinforcement 12 to be quickly aligned with the end of the vehicle body longitudinal beam during installation, simplifying the assembly process and improving production efficiency.

[0046] According to some embodiments of this utility model, the first side plate 1222 and the second side plate 1223 are symmetrically arranged in the width direction of the vehicle, which not only optimizes the force transmission path but also simplifies the manufacturing and assembly process. The symmetrical arrangement of the first side plate 1222 and the second side plate 1223 ensures balanced reinforcement of both sides of the ends of the vehicle body longitudinal beam, effectively balancing loads from different directions and preventing local stress concentration caused by uneven force distribution.

[0047] The second connecting portions 1221 of the first side plate 1222 and the second side plate 1223 are symmetrically arranged in the width direction of the vehicle, making the connection force distribution between the reinforcing member 12 and the longitudinal beam of the vehicle body more uniform. The multiple second connecting portions 1221 work together to improve the reliability and durability of the connection parts, which not only enhances the stability of the overall structure, but also facilitates the alignment operation during assembly, improves production efficiency and assembly accuracy, and provides convenience for subsequent maintenance.

[0048] According to some embodiments of this utility model, such as Figure 1As shown, the first side plate 1222 has a transition section 1222a connected to the third side plate 1224, and the height of the transition section 1222a gradually decreases in the direction towards the third side plate 1224. The transition section 1222a achieves smooth stress transfer between the first side plate 1222 and the third side plate 1224, effectively avoiding stress concentration at the connection. Through the gradual decrease in height, the load can be naturally dispersed along the transition section 1222a, significantly improving the overall fatigue resistance of the stiffener 12. In addition, the transition section 1222a makes the connection between the first side plate 1222 and the third side plate 1224 more natural and smooth, which not only improves the overall aesthetics but also takes into account manufacturability and reliability.

[0049] According to some embodiments of this utility model, the transition segment 1222a and the third side plate 1224 are smoothly connected. Smooth transition means that the transition segment 1222a and the third side plate 1224 are connected in a continuous and gradual manner, without obvious abrupt changes in cross-section. Through the smooth transition connection between the transition segment 1222a and the third side plate 1224, a more optimized mechanical transfer path and structural performance can be achieved, allowing the load to be naturally and continuously transferred along the transition segment 1222a to the third side plate 1224, significantly improving the fatigue resistance of the connection area and the overall structural strength.

[0050] According to some embodiments of this utility model, such as Figure 1 As shown, the rear bumper mounting plate 11 has weight-reduction holes 111. By reasonably setting the weight-reduction holes 111, the weight of the components can be effectively reduced while ensuring structural strength, thus reducing the overall vehicle weight. The base plate 121 has an inner edge 1212 and an outer edge 1213 that are connected to each other. The inner edge 1212 is connected to the side plate 122 to ensure the continuity and stability of the overall structure of the reinforcement 12. The outer edge 1213 has a curved and extended avoidance edge 1213a. The avoidance edge 1213a is spaced apart from the edge of the weight-reduction hole 111 and surrounds at least part of the outer periphery of the weight-reduction hole 111. This avoids structural interference with the weight-reduction hole 111 and maintains the continuity of the edge of the base plate 121 through the surrounding arrangement.

[0051] The avoidance edge 1213a cleverly avoids the area of ​​the weight-reducing hole 111 by bending and extending, while maintaining an appropriate distance from the edge of the weight-reducing hole 111. This ensures that the overall rigidity of the base plate 121 is not affected by the weight-reducing hole 111, and also avoids stress concentration. By extending around the outer periphery of the weight-reducing hole 111, the avoidance edge 1213a creates a complete force transmission path around the weight-reducing hole 111, ensuring that local loads can be effectively distributed to the surrounding structure through the avoidance edge 1213a.

[0052] According to some embodiments of this utility model, the reinforcing member 12 is constructed as a sheet metal stamping part. By constructing the reinforcing member 12 as a sheet metal stamping part, the forming characteristics of the metal sheet can be fully utilized, and the bottom plate 121, side plate 122 and connecting parts can be integrally formed in one go by the mold. This not only ensures the consistency and precision of the structure, but also improves production efficiency and reduces manufacturing costs.

[0053] The sheet metal stamping process gives the reinforcing part 12 high dimensional accuracy and surface quality, ensuring its fit with the rear bumper mounting plate 11 and the body longitudinal beams, thereby optimizing force transmission. At the same time, the stamped reinforcing part 12, while ensuring strength, can achieve weight reduction through reasonable structural design, avoiding a significant increase in vehicle weight due to localized reinforcement.

[0054] Furthermore, sheet metal stampings possess excellent machinability and repeatability, facilitating mass production and allowing for flexible adaptation to the needs of different vehicle models. By optimizing stamping process parameters and die design, the rigidity and durability of the reinforcing part 12 can be further improved, enabling it to maintain stable performance even under special operating conditions such as trailers.

[0055] Compared to aluminum castings in related technologies, sheet metal stampings have a more significant cost advantage. The cost of aluminum castings is about five times that of sheet metal stampings.

[0056] Therefore, by using the sheet metal stamping forming of the reinforcing part 12, not only are the functional requirements of the rear body component 1 met, but the economic efficiency of manufacturing and the convenience of assembly are also taken into account, which helps to improve the overall production efficiency and product quality.

[0057] According to some embodiments of this utility model, a protective coating is provided on the outer surface of the reinforcing member 12. By providing a protective coating on the outer surface of the reinforcing member 12, direct contact between the metal substrate and the external environment can be effectively isolated, preventing rust problems caused by moisture, salt spray or chemical corrosive media, and significantly improving the durability and service life of the reinforcing member 12.

[0058] The protective coating can be a black paint coating, which is applied to the surface of the reinforcing member 12 by cathodic electrophoresis to form a dense and uniform protective layer with good anti-corrosion performance.

[0059] The vehicle according to this utility model is briefly described below.

[0060] like Figure 2 and Figure 3As shown, the vehicle according to this utility model includes the rear body component 1 in any of the above embodiments. Since the vehicle according to this utility model includes the rear body component 1 in any of the above embodiments, the vehicle according to this utility model has a rear body component 1 that can be flexibly adapted to different configuration requirements, ensuring body strength while also considering production economy and ease of maintenance.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0062] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A vehicle body rear subassembly for a vehicle, characterized by, The present application relates to a rear bumper mounting structure for a vehicle, and more particularly to a rear bumper mounting structure for a vehicle, which is capable of reducing the weight of the vehicle and improving the rigidity of the vehicle. The rear bumper mounting structure for a vehicle comprises: a vehicle body side member; a rear bumper mounting plate (11) connected to an end portion of the vehicle body side member on a surface thereof toward the inside of the vehicle; 2. The vehicle body rear assembly according to claim 1, characterized by a reinforcement member (12) having at least a portion thereof fitted to a surface of the rear bumper mounting plate (11) and at least another portion thereof covering at least a part of the outer periphery of the end portion of the vehicle body side member, the reinforcement member (12) being detachably connected to the vehicle body side member and the rear bumper mounting plate (11), respectively. The reinforcement member (12) comprises: a bottom plate (121) fitted to the surface of the rear bumper mounting plate (11), the bottom plate (121) being formed with a first connecting portion (1211) adapted to be detachably connected to the rear bumper mounting plate (11); 3. The vehicle body rear assembly according to claim 2, characterized by a side plate (122) connected to an edge of the bottom plate (121) and extending in a direction perpendicular to the surface of the bottom plate (121), the side plate (122) covering at least a part of the outer periphery of the end portion of the vehicle body side member, the side plate (122) being formed with a second connecting portion (1221) adapted to be detachably connected to the vehicle body side member. The side plate (122) comprises: a first side plate (1222) and a second side plate (1223) disposed in a width direction of the vehicle and covering both side surfaces of the end portion of the vehicle body side member, respectively; 4. The vehicle body rear assembly according to claim 3, characterized by a third side plate (1224) having both ends thereof connected to the first side plate (1222) and the second side plate (1223), respectively, the third side plate (1224) covering a lower surface of the end portion of the vehicle body side member.

5. The vehicle body rear assembly according to claim 4, characterized in that, The first side plate (1222) and the second side plate (1223) are disposed symmetrically to each other in the width direction of the vehicle, and the second connecting portions (1221) provided in the first side plate (1222) and the second side plate (1223) are disposed symmetrically to each other in the width direction of the vehicle.

6. The vehicle body rear assembly of claim 5, wherein, The first side plate (1222) is formed with a gradual change section (1222a) connected to the third side plate (1224), the gradual change section (1222a) gradually decreasing in height in a direction toward the third side plate (1224).

7. The vehicle body rear assembly of claim 2, wherein, The gradual change section (1222a) and the third side plate (1224) are smoothly connected. The rear bumper mounting plate (11) is formed with a weight-reducing hole (111); 8. The vehicle body rear assembly of claim 1, wherein, The bottom plate (121) is formed with an inner edge (1212) and an outer edge (1213) connected to each other, the inner edge (1212) being connected to the side plate (122), the outer edge (1213) being formed with a curved and extended avoiding edge (1213a) disposed apart from an edge of the weight-reducing hole (111) and surrounding at least a part of the outer periphery of the weight-reducing hole (111). The reinforcement member (12) is configured as a sheet metal stamping.

9. The vehicle body rear assembly of claim 1, wherein, The outer surface of the reinforcement (12) is provided with a protective coating.

10. A vehicle characterized by comprising: The rear body assembly according to any one of claims 1-9.

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