Automobile rear bumper, automobile rear assembly and automobile

Abstract

The automobile rear bumper comprises a lower body, an upper body is arranged above the lower body, lower decoration plates are connected to the bottoms of the two sides of the upper body and the edge of the bottom of the lower body, fog lamp mounting positions are located on the two sides of the upper body, and the lower decoration plates are obliquely arranged towards the inner side of the automobile from top to bottom. A plurality of heat dissipation holes are formed in the high-temperature area corresponding to the bottom end part, forming the smallest included angle with the horizontal plane, in the lower decoration plate, the heat dissipation holes are distributed at intervals in the length direction of the bottom end part of the lower decoration plate, the rear bumper is prevented from being heated to deform, and meanwhile drainage of the inner side of the bumper is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and in particular to an automobile rear bumper, an automobile rear assembly and an automobile. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] With the continuous development of the automotive industry, automobile styling design is becoming increasingly diversified and personalized. As an important component of the car's appearance, the bumper must not only provide basic collision protection, but also meet certain requirements in terms of vehicle performance. One type of rear bumper assembly has a problem with heat accumulation from the exhaust system due to the close proximity of the bottom area to the rear exhaust system, resulting in deformation of the rear bumper. In related technologies, due to the constraints of styling and vehicle layout, the solution to solve the problem of exhaust heat accumulation is often to add insulation tiles to the rear exhaust to reduce the heating of the rear bumper. However, this solution is relatively expensive and is not conducive to overall vehicle cost control.

[0004] At present, there is a car rear assembly and a car, including a rear bumper and a muffler, a rear fog lamp and a protective cover are installed on the rear bumper, the rear fog lamp is located between the rear bumper and the muffler, and a protective cavity is formed between the inner wall surface of the protective cover and the rear bumper, the rear fog lamp is located inside the protective cavity, and the protective cover blocks the heat generated by the muffler from flowing to the rear fog lamp, the rear fog lamp is fixed in the middle of the bumper, and heat dissipation holes are provided on both sides of the rear fog lamp. When the above solution is adopted, an additional protective cover or heat insulation cover is required to block the heat from radiating backward, resulting in an increase in the cost of the entire vehicle. If the protective cover is omitted, the setting position of the muffler needs to be lowered to increase the distance between it and the fog lamp, which brings the problem of the muffler being exposed, reducing the aesthetics of the entire vehicle. At the same time, the heat dissipation holes are provided on the part of the rear bumper that is approximately perpendicular to the horizontal plane. When the vehicle wades through water, water enters the inner side of the rear bumper from the heat dissipation holes, and the accumulated water is not easy to discharge. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a rear bumper, a rear assembly and a vehicle, which overcome the defects of the current rear assembly.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions: In the first aspect, an embodiment of the present invention provides a rear bumper of an automobile, comprising a lower body, an upper body being provided above the lower body, lower trim panels being connected to the bottom of both sides of the upper body and the bottom edge of the lower body, the fog lamp mounting positions being located on both sides of the upper body, and the lower trim panels being tilted toward the inner side of the automobile from top to bottom, a plurality of heat dissipation holes being provided in a high temperature zone corresponding to the bottom portion of the lower trim panel where the angle with the horizontal plane is the smallest, and the plurality of heat dissipation holes are spaced apart along the length direction of the bottom portion of the lower trim panel.

[0007] Optionally, the high temperature area of ​​the rear bumper is determined according to the temperature field simulation analysis results of the rear bumper and the tail muffler of the automobile, and heat dissipation holes are opened in the area corresponding to the high temperature area and the bottom part of the lower trim panel.

[0008] Optionally, the heat dissipation hole is a square hole or a circular hole. Preferably, the heat dissipation hole is a square hole.

[0009] Optionally, the plurality of heat dissipation holes in the high temperature zone are distributed at equal intervals along the length direction of the bottom portion of the lower decorative panel.

[0010] Optionally, an inner end portion of the bottom portion of the lower trim panel is provided with an arc plate segment, which is tangent to the bottom portion of the lower trim panel and bends toward the inner side of the vehicle.

[0011] Optionally, the distance between the outer side of the heat dissipation hole and the outer edge of the bottom part of the lower decorative plate is 10mm-12mm, preferably 11mm, and the distance between the inner side of the heat dissipation hole and the inner end of the arc plate segment is 5mm-7mm, preferably 6mm.

[0012] Optionally, the spacing between adjacent heat dissipation holes is 2 mm-4 mm, preferably 3 mm.

[0013] Optionally, a plurality of stiffening ribs are provided on the inner side surface of the lower decorative panel to compensate for the weakening of the lower decorative panel structure caused by the provision of the heat dissipation holes.

[0014] In a second aspect, an embodiment of the present invention provides a rear automobile assembly, comprising the automobile rear bumper described in the first aspect, wherein a tail muffler is provided on the inner side of the automobile rear bumper, and the tail muffler is arranged on the inner side of the lower trim panel.

[0015] In a third aspect, an embodiment of the present invention provides a vehicle provided with the vehicle rear assembly described in the second aspect.

[0016] The beneficial effects of the present invention are as follows: The rear bumper of the automobile of the present invention is provided with heat dissipation holes at the bottom end portion of the lower trim panel where the angle with the horizontal plane is the smallest. The heat generated by the tail muffler can be dissipated through the heat dissipation holes, thereby solving the problem of rear bumper deformation caused by heat accumulation in the area of ​​the rear bumper near the tail muffler. The heat dissipation holes only need to be provided on the lower trim panel. Moreover, the fog lamp mounting holes are provided on both sides of the upper body and are far away from the tail muffler. The heat generated by the tail muffler is dissipated through the heat dissipation holes and has little effect on the fog lamp. No protective cover is required, which is convenient for modification and does not increase the cost of a single vehicle. By providing the heat dissipation holes at the bottom end portion of the lower trim panel, the heat dissipation holes can also play a drainage role. When the automobile is driving in wading conditions, the accumulated water entering the inner side of the rear bumper can be discharged through the heat dissipation holes, thereby reducing the structural impact of the rear bumper due to wading. At the same time, the heat dissipation holes are provided at the bottom end portion of the lower trim panel and are not visible on the rear appearance of the automobile, so as not to affect the appearance of the entire vehicle. The entire rear bumper has strong practicality and operability.

[0017] 2. The heat dissipation holes of the automobile rear bumper of the present invention are square holes, which are convenient for structural adjustment on the mold in the later stage and convenient for processing and manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present invention; Figure 2 This is a top view of the overall structure of Example 1 of the present invention; Figure 3 This invention Figure 2 A partial enlarged view of point C; Figure 4 This invention Figure 3 Schematic diagram of the cross section at point B in FIG. Figure 5 This is a schematic diagram of the temperature field simulation of a traditional rear bumper; Figure 6 2 is a schematic diagram of the temperature field simulation of the rear bumper of Example 1 of the present invention; Figure 7 This is a schematic diagram of heat accumulation in the rear muffler of a conventional car rear assembly; Figure 8 This invention Figure 2 Schematic diagram of the cross section at point A; Among them, 1. Upper body, 2. Lower body, 3. Lower trim, 4. Tail muffler, 5. Cooling holes, 6. Stiffening ribs; 3-1. Plate part, 3-2. Arc-shaped plate segment. DETAILED DESCRIPTION

[0020] For the convenience of description, if the words "upper" and "lower" appear in the present invention, they only indicate that they are consistent with the upper and lower directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0021] Example 1 This embodiment provides a car rear bumper, such as Figure 1-Figure 3 As shown, the lower body 2 comprises a lower body 2, the upper body 1 being connected to its upper edge. The lower edges of the upper body 1 and the lower body 2 are fixedly connected to the upper edge of a lower trim panel 3. In this embodiment, the lower trim panel 3 is made of a PP-based plastic that can withstand temperatures of approximately 90°C. The PP-based plastic has a low density and is lightweight, helping to reduce the overall weight of the vehicle and improve fuel economy. It also exhibits excellent chemical stability, resisting corrosion from a variety of chemicals and ensuring the service life of the lower trim panel in various environments.

[0022] From top to bottom, the lower trim panel 3 is tilted toward the interior of the vehicle. This tilted design protects the lower trim panel 3 from direct impact from external objects to a certain extent. The lower trim panel 3 is composed of multiple panels connected in an integrated manner. This integrated design enhances the overall structural strength of the lower trim panel 3, reduces weak links at the connections, and improves its impact resistance. The multiple panels are arranged at a predetermined acute angle with the horizontal plane, with the bottommost panel 3-1 having the smallest angle with the horizontal plane. An arcuate panel segment 3-2 is provided at the inner end of the bottommost panel 3-1. The arcuate panel segment 3-2 is arranged tangentially to the bottommost panel 3-1 and curves toward the interior of the vehicle. The arcuate panel segment 3-2 serves as a styling surface.

[0023] The arc-shaped plate segment 3-2 serves as a styling surface, which not only adds a unique aesthetic element to the rear of the car, but also optimizes the air flow to a certain extent, reduces the generation of vortices, and further reduces wind resistance.

[0024] The structures and arrangements of the lower body 2 , the upper body 1 and the lower decorative plate 3 may be based on existing technologies and will not be described in further detail herein.

[0025] The lower trim panel 3 of the traditional rear bumper is arranged on one side of the tail muffler 4. This layout has obvious defects in heat dissipation. Since the lower trim panel 3 of the traditional rear bumper has no heat dissipation holes, the heat accumulated in the rear bumper is dissipated slowly. The tail muffler 4 generates a large amount of heat during operation. This heat cannot be dissipated in time, which will easily cause heat to accumulate near the lower trim panel 3 and then cause the rear bumper to be subjected to high temperature. Through simulation analysis, the temperature of the lower trim panel 3 of the rear bumper is as high as about 103°C under the action of the tail muffler 4. Therefore, the rear bumper is very likely to be deformed by baking at the lower trim panel 3 due to slow heat dissipation. The deformed rear bumper will not only affect the overall appearance of the car, but may also reduce its protective performance. When subjected to external impact, it cannot effectively protect the safety of the car body and the people in the car, and there is a major safety hazard.

[0026] In order to solve this problem, this embodiment improves the current rear bumper.

[0027] A plurality of heat dissipation holes 5 are provided on the lower trim plate, through which the heat accumulated in the rear bumper is dissipated, thereby preventing the lower trim plate of the rear bumper from being subjected to high temperature baking and being deformed.

[0028] Specifically: these heat dissipation holes 5 form "heat dissipation channels" that can quickly dissipate the heat accumulated in the rear bumper, effectively avoiding deformation of the lower trim panel 3 due to high-temperature baking, and greatly improving the reliability and service life of the rear bumper.

[0029] In this embodiment, the heat dissipation holes 5 are arranged on the plate portion 3-1 at the bottom end of the lower decorative panel 3. With this arrangement, on the one hand, since the acute angle between the plate portion 3-1 at the bottom end of the lower decorative panel 3 and the horizontal plane is the smallest and is close to a horizontal arrangement, the heat dissipation holes 5 are invisible on the rear appearance of the car and do not affect the appearance of the entire car. On the other hand, the heat dissipation holes 5 can also play a role in drainage. When the car is driving in wading conditions, water may enter the inside of the bumper. If there is no effective drainage path, the collected water will cause an impact on the structure of the rear bumper and affect its structural strength. By providing the heat dissipation holes 5, the accumulated water entering the inside of the rear bumper can be discharged, reducing the structural impact of the rear bumper due to wading and protecting the internal structure of the bumper.

[0030] In this embodiment, the method for determining the location of the heat dissipation hole 5 on the bottommost plate portion 3 - 1 of the lower decorative plate 3 is as follows: First, a three-dimensional model of the rear bumper and tail muffler 4 is created. This process requires precise measurement and drawing of the size and shape of each component to ensure the accuracy and authenticity of the model.

[0031] The three-dimensional model is imported into the finite element simulation software, and the temperature field of the rear bumper and the tail muffler is simulated and analyzed using the finite element simulation software to obtain the high temperature area of ​​the rear bumper.

[0032] Finite element simulation analysis is an analysis method based on mathematical models and computer technology. It can simulate the temperature distribution under actual working conditions and obtain the high-temperature area of ​​the rear bumper through complex calculations.

[0033] The establishment of the three-dimensional model of the rear bumper and the tail muffler 4 and the subsequent simulation analysis of the temperature field can be carried out using existing technologies and will not be described in detail here.

[0034] The area corresponding to the high temperature zone on the bottommost plate portion 3 - 1 of the lower decorative plate 3 is used as the area where the heat dissipation holes 5 are set, and this area is defined as the heat dissipation area.

[0035] With this setting method, the heat dissipation holes 5 can be set on the lower trim panel 3 in a targeted manner, rather than setting the heat dissipation holes 5 on the entire surface of the plate portion 3-1 at the bottom end of the lower trim panel 3. While ensuring the heat dissipation effect, the degree to which the heat dissipation holes 5 weaken the rear bumper structure is minimized.

[0036] In the bottom end plate portion 3-1 of the lower decorative panel 3, each heat dissipation area is provided with a plurality of heat dissipation holes 5, and the plurality of heat dissipation holes 5 are distributed at intervals along the length direction of the bottom end plate portion 3-1 of the lower decorative panel 3, that is, distributed at intervals along the edge of the bottom end plate portion 3-1 of the lower decorative panel 3.

[0037] Preferably, the plurality of heat dissipation holes 5 are distributed at equal intervals along the edge of the bottommost plate portion 3 - 1 of the lower decorative plate 3 .

[0038] The heat dissipation holes 5 are circular holes or square holes. In this embodiment, in order to facilitate structural adjustment on the mold in the later stage and facilitate processing and manufacturing, the heat dissipation holes 5 are square holes.

[0039] In this embodiment, Figure 4 As shown, the distance between the outer edge of the heat dissipation hole 5 and the outer edge of the bottommost plate portion 3 - 1 of the lower decorative plate 3 is 10 mm-12 mm, preferably 11 mm.

[0040] The distance between the inner edge of the heat dissipation hole 5 and the inner end of the arc-shaped plate segment 3 - 2 is 5 mm to 7 mm, preferably 6 mm.

[0041] The appropriate spacing between adjacent heat dissipation holes 5 can not only ensure that the mutual influence between the heat dissipation holes is small, but also make the number of heat dissipation holes 5 in the heat dissipation area reasonable to achieve the best heat dissipation effect. In this embodiment, the spacing between adjacent square holes is 2mm-4mm, preferably 3mm.

[0042] Therefore, the size of the square hole is 25 mm in length and 18 mm in width, which can ensure that the heat dissipation hole 5 has enough space for heat dissipation while avoiding excessive weakening of the structural strength of the lower decorative plate 3 by the heat dissipation hole 5 .

[0043] Through the above-mentioned size setting, the structural strength of the lower trim panel can be guaranteed while ensuring the heat dissipation effect.

[0044] In this embodiment, the rear bumper is provided with three high-temperature zones, corresponding to three heat dissipation areas. The heat dissipation areas on both sides are provided with seven heat dissipation holes 5, and the heat dissipation area in the middle is provided with twenty heat dissipation holes 5. The number of heat dissipation holes is determined based on the size of the high-temperature zones and the heat dissipation requirements, ensuring that heat from each high-temperature zone is effectively dissipated.

[0045] It is understandable that those skilled in the art can flexibly adjust the size of the heat dissipation holes, the distance between adjacent heat dissipation holes, and the number of heat dissipation holes according to actual needs.

[0046] In one embodiment, the high temperature area of ​​the rear bumper is first obtained based on a finite element analysis of the temperature field of the rear bumper and the tail muffler.

[0047] Then, according to the size of the high-temperature area, the sizes and layout of various heat dissipation holes are pre-set.

[0048] For each scheme, the temperature field finite element analysis and structural strength analysis of the rear bumper and the tail muffler 4 are performed, and the heat dissipation hole arrangement scheme that meets the structural strength requirements and has the best heat dissipation effect is selected as the final heat dissipation hole arrangement scheme.

[0049] Furthermore, to compensate for the weakening of the lower panel's structural strength caused by the heat dissipation holes, the inner surface of the lower panel is provided with a plurality of stiffening ribs 6. These ribs act as "reinforcement bars" for the lower panel 3, enhancing its structural strength and preventing deformation when subjected to external forces. Furthermore, these ribs 6 can reduce thermal deformation of the lower panel 3. During the heat dissipation process through the heat dissipation holes 5, the lower panel 3 may generate certain thermal stresses due to temperature changes. The presence of these ribs effectively disperses these thermal stresses, reducing the risk of thermal deformation.

[0050] Multiple stiffening ribs 6 are distributed along the length direction of the lower trim panel 3. The stiffening ribs 6 on both sides of the center line of the lower trim panel 3 are symmetrically arranged relative to the center line of the lower trim panel 3. This symmetrical distribution method can make the force on the lower trim panel 3 more uniform in all directions, further improving its structural stability.

[0051] The stiffening ribs 6 enhance the structural strength of the lower trim panel 3 and reduce the thermal deformation of the lower trim panel 3. Moreover, the stiffening ribs 6 are arranged on the inner side of the lower trim panel 3 and will not affect the appearance of the rear bumper.

[0052] The stiffening ribs 6 and lower trim panel 3 can be integrally injection molded, which will not be described in detail here. This integral injection molding process ensures a tight connection between the stiffening ribs and lower trim panel, eliminating any weak links and allowing the stiffening ribs to fully enhance structural strength. Furthermore, this integral injection molding process offers the advantages of high production efficiency and low cost, making it suitable for large-scale production.

[0053] In this embodiment, three stiffening ribs 6 are provided, one stiffening rib 6 is provided at a position between adjacent high-temperature zones, and one stiffening rib 6 is provided at a central position of a central high-temperature zone.

[0054] Fog lights are important lighting devices for vehicles driving in low-visibility conditions such as fog and rain. The rationality of their installation location has a significant impact on both the lighting effect and the vehicle's safety. Traditional fog lights are usually installed in the middle of the rear bumper. This installation method makes the distance between the fog lights and the tail muffler relatively close, and the heat accumulated by the tail muffler in the rear bumper is easily transferred to the fog lights, causing damage to the fog lights due to high temperatures. In this embodiment, the fog lights are installed on the raised portions on both sides of the upper plate. Compared with the traditional installation method of the fog lights in the middle of the rear bumper, this arrangement increases the distance between the fog lights and the tail muffler 4 after installation, making it difficult for the heat accumulated by the tail muffler 4 in the rear bumper to be transferred to the fog lights, effectively protecting the fog lights from damage due to high temperatures.

[0055] Therefore, in this embodiment, a protective cover is not required to protect the fog lamp, which makes modification easy and does not increase the cost of the vehicle.

[0056] It is understandable that after the heat dissipation holes 5 are opened, if the temperature of the high temperature zone meets the heat resistance requirement of the fog lamp, the fog lamp can also be arranged in the middle position of the rear bumper.

[0057] Those skilled in the art can set the fog lamp installation position according to actual needs, which will not be described in detail here.

[0058] In this embodiment, a plurality of heat dissipation holes 5 and stiffening ribs 6 are only provided on the bottom plate portion 3-1 of the lower trim panel 3, and fog lamp mounting positions are provided on the raised portions on both sides of the upper body 1. The remaining structures can adopt the existing technology of the rear bumper and will not be described in detail here.

[0059] The rear bumper of this embodiment is provided with heat dissipation holes at the bottom end portion of the lower trim panel 3 where the angle with the horizontal plane is the smallest. The heat generated by the tail muffler 4 can be dissipated through the heat dissipation holes, thereby solving the problem of rear bumper deformation caused by heat accumulation in the area of ​​the rear bumper near the tail muffler. It is sufficient to provide the heat dissipation holes 5 on the lower trim panel 3. Moreover, the fog lamp mounting holes are provided on both sides of the upper body, which are far away from the tail muffler 4. The heat generated by the tail muffler 4 is dissipated through the heat dissipation holes, which has little effect on the fog lamp. There is no need to provide a protective cover, which is convenient for modification and does not increase the cost of a single vehicle. By providing the heat dissipation holes 5 at the bottom end portion of the lower trim panel 3, the heat dissipation holes 5 can also play a drainage role. When the car is driving in wading conditions, the accumulated water entering the inside of the rear bumper can be discharged through the heat dissipation holes 5, reducing the structural impact of the rear bumper due to wading. At the same time, the heat dissipation holes are provided at the bottom end portion of the lower trim panel and are not visible in the appearance of the rear of the car, so as not to affect the beauty of the entire vehicle. The entire rear bumper has strong practicality and operability.

[0060] In order to verify the heat dissipation effect of the heat dissipation holes of this embodiment, a temperature field finite element analysis was performed on a traditional rear bumper and the rear bumper of this embodiment.

[0061] Figure 5 The temperature field analysis diagram of the traditional rear bumper is shown. There is no heat dissipation hole 5 on the lower trim of the rear bumper. Figure 5 It can be seen that three high-temperature areas with relatively high temperatures are formed on the lower trim panel 3, and the temperature of the high-temperature areas reaches 103°C. Such a high temperature indicates that the traditional rear bumper has serious problems in heat dissipation. The rear bumper is very likely to be baked and deformed in the high-temperature areas due to slow heat dissipation.

[0062] Figure 6 This is the temperature field analysis diagram of the rear bumper of this embodiment. This embodiment is provided with heat dissipation holes 5. Figure 6 It can be seen that the area of ​​the high-temperature zone on the lower trim panel 3 is significantly reduced, and the temperature of the high-temperature zone is controlled at about 90°C, which greatly reduces the risk of baking deformation of the lower trim panel 3. This result fully demonstrates that the heat dissipation hole 5 design of this embodiment can effectively reduce the temperature of the rear bumper, greatly reducing the risk of baking deformation of the lower trim panel 5, and verifying the effectiveness and scientific nature of the improvement measures of this embodiment.

[0063] Example 2 This embodiment provides a rear assembly of an automobile, including the rear bumper described in Example 1, and a tail muffler 4 is provided on the inner side of the lower trim of the rear bumper. The tail muffler 4 can adopt existing equipment and will not be described in detail here. The relative position between the tail muffler and the lower trim can adopt existing technology and will not be described in detail here.

[0064] In this embodiment, compared with the traditional rear assembly of a car, only the rear bumper is improved, and the installation position and structure of the tail muffler 4 are not improved. There is no need to lower the installation position of the tail muffler 4, which avoids the exposure of the tail muffler and does not reduce the aesthetics of the entire vehicle.

[0065] like Figure 7 As shown, during the operation of the car, the heat generated by the tail muffler 4 will accumulate between the tail muffler 4 and the rear bumper. After a large amount of heat is accumulated, the rear bumper is easily baked and deformed. After the rear assembly of the car of this embodiment is adopted, Figure 8 As shown, the hot air flow generated by the heat of the tail muffler 4 flows under the action of the lower trim, flows through the heat dissipation holes, and flows out from the heat dissipation holes, thereby achieving heat dissipation and reducing heat accumulation in the area between the lower trim and the tail muffler.

[0066] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A rear bumper for an automobile, comprising a lower body, an upper body disposed above the lower body, lower trim panels connected to the bottoms of both sides of the upper body and to the bottom edge of the lower body, fog lamp mounting positions located on both sides of the upper body, the lower trim panels tilted toward the inside of the automobile from top to bottom, a plurality of heat dissipation holes disposed in a high-temperature area corresponding to a bottom portion of the lower trim panel where the angle with the horizontal plane is smallest, the plurality of heat dissipation holes being spaced apart along the length of the bottom portion of the lower trim panel.

2. The automobile rear bumper according to claim 1, characterized in that: The high-temperature area of ​​the rear bumper is determined based on the temperature field simulation analysis results of the rear bumper and the tail muffler, and heat dissipation holes are opened in the area corresponding to the bottom part of the lower trim panel in the high-temperature area.

3. The automobile rear bumper according to claim 1, characterized in that: The heat dissipation holes are square holes or circular holes. Preferably, the heat dissipation holes are square holes.

4. The automobile rear bumper according to claim 1, characterized in that: The plurality of heat dissipation holes in the high temperature zone are distributed at equal intervals along the length direction of the bottom end portion of the lower decorative panel.

5. The automobile rear bumper according to claim 1, characterized in that: An arc plate segment is provided at the inner end portion of the bottom end portion of the lower decorative panel. The arc plate segment is tangent to the bottom end portion of the lower decorative panel and is bent toward the inner side of the automobile.

6. The automobile rear bumper according to claim 5, characterized in that: The distance between the outer side of the heat dissipation hole and the outer edge of the bottom part of the lower decorative plate is 10mm-12mm, preferably 11mm, and the distance between the inner side of the heat dissipation hole and the inner end of the arc plate segment is 5mm-7mm, preferably 6mm.

7. The automobile rear bumper according to claim 1, characterized in that: The spacing between adjacent heat dissipation holes is 2mm-4mm, preferably 3mm.

8. The automobile rear bumper according to claim 1, characterized in that: The inner side surface of the lower decorative plate is provided with a plurality of stiffening ribs.

9. A rear assembly of an automobile, characterized in that: The invention comprises the automobile rear bumper according to any one of claims 1 to 8, wherein a tail muffler is provided on the inner side of the automobile rear bumper, and the tail muffler is arranged on the inner side of the lower decorative panel.

10. An automobile, characterized in that: A rear vehicle assembly according to claim 9 is provided.

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