Self-positioning type rear bumper assembly

Abstract

The invention relates to the field of automobile rear protection, in particular to a self-positioning type rear protection assembly and a rear protection unit, the rear protection unit comprises a rear protection body, and the rear protection body is connected with a lower decoration plate; the rear bumper body is connected with the lower decorative plate; the rear protection body comprises a rear protection main body; the rear bumper main body comprises a rear bumper base body; the lower decoration plate comprises a decoration plate body; the plaque body comprises a plaque base body; a positioning unit is arranged between the rear bumper base body and the plaque base body; the positioning unit comprises an inserting protrusion arranged on the rear bumper base body and an inserting groove formed in the plaque base body. The rear bumper base body is inserted into the inserting groove of the plaque base body through the inserting bulge; through the arrangement of the positioning unit, the rear protection body is equivalently inserted into the lower decoration plate, so that the transverse positions of the rear protection body and the lower decoration plate can be better limited, and the problem that the rear protection body and the lower decoration plate are easy to shake due to the fact that a buckle is singly used for connection traditionally is solved.

Description

Technical Field

[0001] This invention relates to the field of automotive rear bumper systems, specifically a self-positioning rear bumper assembly. Background Technology

[0002] With the continuous advancement of lightweight and modular design in automobiles, the rear bumper assembly (rear bumper assembly) is an important component of the automotive exterior system, and its structural design and assembly methods are receiving increasing attention.

[0003] Traditional rear bumper assemblies typically use a one-piece structure, which results in an excessively large overall size, making actual injection molding production inconvenient.

[0004] Therefore, a segmented rear bumper assembly structure was developed, which mainly includes the rear bumper body and the lower trim panel. However, the traditional rear bumper body and lower trim panel are mostly directly connected by clips or bolts. Although the structure is simple, it has many problems in actual use and assembly:

[0005] 1. Low assembly efficiency and difficult positioning: In the traditional structure, there is no effective pre-positioning mechanism between the rear bumper body and the lower trim panel. During the assembly process, multiple people need to work together or use tooling fixtures to complete the positioning. It is impossible to achieve single-hand pre-attachment, resulting in low assembly efficiency and slow cycle time, which makes it difficult to meet the requirements of modern vehicle manufacturing for high cycle time and flexible production.

[0006] 2. Poor connection reliability and easy to generate abnormal noise: Since the rear bumper body and the lower trim panel are only connected by a buckle and lack a lateral limiting structure, the lower trim panel is prone to lateral movement when the vehicle is traveling at high speed, which is affected by cross wind and road surface excitation, thus causing "slapping noise" and affecting NVH performance and user experience.

[0007] 3. Differences in thermal expansion lead to changes in assembly gaps: The rear bumper body and lower trim panel are usually injection molded from thermoplastic materials such as PP, which have a large coefficient of thermal expansion.

[0008] In environments with significant temperature variations, linear misalignment caused by thermal expansion and contraction can easily lead to uneven assembly gaps, which in turn affects appearance quality and structural stability.

[0009] 4. Insufficient rigidity and low modal frequency of the rear bumper end mounting structure: Traditional rear bumper ends mostly use distributed brackets to connect to the vehicle body. The installation points are scattered and do not form an effective closed force transmission path, resulting in low rigidity and low modal frequency of the end structure. This makes it easy to cause resonance and excessive surface difference (>0.5 mm) during high-speed driving or low-speed collisions, increasing maintenance costs.

[0010] 5. Difficulty in balancing aerodynamic performance and aesthetic appeal: Existing rear bumper assemblies rarely consider the airflow guidance function at the rear during design, which easily generates turbulence and wake vortices at the rear of the vehicle, increasing wind resistance and affecting rear wheel grip; at the same time, the assembly gap between the lower trim panel and the rear bumper body is exposed and lacks a shielding structure, affecting the aesthetic appeal and weather resistance.

[0011] 6. Limited functionality and low structural integration of decorative components: The bright strips on traditional lower trim panels are used only as decorative elements and are fixed with double-sided tape or clips. Their function is limited and they are not integrated with functions such as structural reinforcement, weight reduction, or airflow guidance, resulting in system redundancy and increased costs.

[0012] The existing patent CN 120327432 A - A self-positioning rear bumper assembly does not explicitly disclose the technical content that solves the above-mentioned technical problems.

[0013] Therefore, in order to improve or solve at least one of the above technical problems, it is necessary to optimize the design of the existing rear protection structure. Summary of the Invention

[0014] The purpose of this invention is to provide a rear bumper assembly with a lateral positioning function between the rear bumper body and the lower trim panel.

[0015] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0016] A self-positioning rear bumper assembly, a rear bumper unit, the rear bumper unit including a rear bumper body, the rear bumper body being connected to a lower trim panel; the rear bumper body being connected to the lower trim panel;

[0017] The rear protection body includes a rear protection main body; the rear protection main body includes a rear protection substrate;

[0018] The lower trim panel includes a trim panel body; the trim panel body includes a trim panel substrate;

[0019] A positioning unit is provided between the rear retainer substrate and the trim panel substrate;

[0020] The positioning unit includes a plugging protrusion on the rear bumper base and a plugging groove on the trim panel base; the rear bumper base is plugged into the plugging groove of the trim panel base through the plugging protrusion.

[0021] The positioning unit is arranged in the middle area between the rear bumper base and the trim panel base.

[0022] The rear bumper body also includes a connecting plate unit disposed on the rear bumper base, the connecting plate unit including an upper connecting plate and a lower connecting plate disposed on the rear bumper base;

[0023] The rear protection body is provided with an installation structure;

[0024] The mounting structure includes an end mounting mechanism disposed at the end of the rear guard body;

[0025] The end mounting structure includes an integral mounting frame;

[0026] The integral installation frame includes a frame body, and the two ends of the frame body respectively press against the adjacent upper or lower connecting plate on the rear guard body.

[0027] One end of the integral mounting frame is snapped into the upper connecting plate on the rear bumper body, and the other end is connected to the lower connecting plate on the rear bumper body by fasteners.

[0028] The rear bumper body includes a rear bumper base plate, and the end of the rear bumper base plate is provided with a raised lip; the lower trim plate is attached to the raised lip of the rear bumper body.

[0029] The integral mounting frame also includes a protruding bracket on the frame body, which is connected to the vehicle body frame.

[0030] The main frame has a grid-like structure; the main frame is fitted to the inner side of the rear retainer.

[0031] The mounting structure also includes an upper edge mounting mechanism;

[0032] The upper edge mounting mechanism includes an upper mounting bracket;

[0033] The upper mounting bracket includes a bracket body, on which a buckle unit is provided; the bracket body is provided with a limiting unit, which includes a longitudinal limiting unit and a lateral limiting unit.

[0034] The longitudinal limiting unit includes a longitudinal mounting plate disposed on the support body. The longitudinal mounting plate includes a longitudinal first plate and a longitudinal second plate. The longitudinal second plate is connected to the support body through the longitudinal first plate. The longitudinal mounting plate is an inverted L-shaped plate.

[0035] The longitudinal mounting plate is mounted on the upper connecting plate in the rear protection body;

[0036] The lateral limiting unit includes a longitudinal limiting plate disposed on the longitudinal L-plate and a snap-fit ​​groove disposed on the upper connecting plate of the rear guard body.

[0037] The lower trim panel is provided with a bright strip unit, which is embedded in the lower trim panel; the bright strip unit includes a bright strip body, which is snapped onto the lower trim panel.

[0038] The rear bumper body has a flow guiding unit at its end; the flow guiding unit is connected to the rear bumper body and overlaps the end of the lower trim panel.

[0039] The advantages of this invention are:

[0040] This invention discloses a self-positioning rear bumper assembly. The rear bumper assembly disclosed in this invention mainly includes a rear bumper body and a lower trim panel. The two-section main structure facilitates the assembly and actual production of the rear bumper assembly.

[0041] In addition, the present invention, through the setting of the positioning unit, makes the rear bumper body essentially plugged into the lower trim panel, thereby better limiting the lateral position of the rear bumper body and the lower trim panel, avoiding the problem of easy shaking caused by the traditional single buckle connection. Attached Figure Description

[0042] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0043] Figure 1 This is a first-view structural schematic diagram of the rear bumper assembly in this invention.

[0044] Figure 2 This is a schematic diagram of the rear bumper assembly from a second perspective in this invention.

[0045] Figure 3 This is a structural schematic diagram of the rear bumper assembly from a third-view perspective in this invention.

[0046] Figure 4 This is a schematic diagram of the structure when the lower trim panel is connected to the flow guiding unit in this invention.

[0047] Figure 5 for Figure 4 A magnified view of a local area.

[0048] Figure 6 This is a schematic diagram of the structure from a first perspective when the rear retainer body and the flow guiding unit are connected in this invention.

[0049] Figure 7 This is a schematic diagram of the structure from a first perspective when the rear retainer body and the flow guiding unit are connected in this invention.

[0050] Figure 8 This is a schematic diagram of the structure when the rear retainer body is connected to the mounting structure in this invention.

[0051] Figure 9 This is a schematic diagram of the integral mounting frame in this invention.

[0052] Figure 10 This is a schematic diagram of the flow guiding unit in this invention.

[0053] Figure 11 This is a schematic diagram of the structure of the first guide plate in this invention.

[0054] Figure 12This is a schematic diagram of the structure of the second guide plate in this invention.

[0055] Figure 13 This is a first-view structural schematic diagram of the upper mounting bracket in this invention.

[0056] Figure 14 This is a first-view structural schematic diagram of the upper mounting bracket in this invention.

[0057] The markings in the above figures are all:

[0058] 1. End mounting mechanism, 2. Upper edge mounting mechanism, 3. Lower trim panel, 4. Bright strip unit, 5. Air guide unit, 6. Rear bumper body. Detailed Implementation

[0059] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and the description of the preferred embodiments.

[0060] A self-positioning rear bumper assembly includes a rear bumper unit comprising a rear bumper body 6 connected to a lower trim panel 3; the rear bumper body 6 and the lower trim panel 3 are connected; the rear bumper body 6 includes a rear bumper main body; the rear bumper main body includes a rear bumper base 61; the lower trim panel 3 includes a trim panel body; the trim panel body includes a trim panel base 31; a positioning unit 3-6 is provided between the rear bumper base 61 and the trim panel base 31; the positioning unit 3-6 includes an insertion protrusion 62 on the rear bumper base 61 and an insertion groove 3 on the trim panel base 31; the rear bumper base 61 is inserted into the insertion groove 3 of the trim panel base 31 via the insertion protrusion 62.

[0061] This invention discloses a self-positioning rear bumper assembly. The rear bumper assembly disclosed in this invention mainly includes a rear bumper body 6 and a lower trim panel 3. The two-section main structure facilitates the assembly and actual production of the rear bumper assembly.

[0062] In addition, by setting the positioning units 3-6, the rear bumper body 6 is essentially inserted into the lower trim panel 3, thereby better limiting the lateral position of the rear bumper body 6 and the lower trim panel 3, avoiding the problem of easy shaking caused by the traditional single buckle connection.

[0063] In this invention, the rear bumper base 61 serves as the main load-bearing plane of the entire rear bumper assembly, transmitting the collision force, pedestrian protection reaction force, and concentrated load at the mounting point to the downward trim panel 3 and the vehicle body.

[0064] The insertion protrusion 62 provides guidance and then interference clamping; Effect: During assembly: pre-attachment can be completed with one hand; during use, it can counteract the alternating lateral force generated by crosswinds on the lower trim panel 3 during vehicle operation, eliminating "slapping noise".

[0065] The decorative panel substrate 31 combines both "decorative" and "functional" aspects.

[0066] After the insertion groove 3 is compensated, the linear misalignment between the substrate 61 and the decorative panel substrate 31 under thermal expansion is prevented.

[0067] The interlocking interference and reverse clamping form a "micro-pre-tightening" system.

[0068] In this invention, the rear bumper body and the lower trim panel 3 are generally made of plastic material, typically PP material, and are generally produced using injection molding.

[0069] Furthermore, in this invention, the positioning units 3-6 are arranged in the middle area of ​​the rear bumper base 61 and the trim panel base 31; the rear bumper body and the lower trim panel 3 are connected by an overlapping and snap-fit ​​connection method; and the positioning units 3-6 are arranged in the middle area of ​​the rear bumper base 61 and the trim panel base 31, so that the rear bumper body 6 and the lower trim panel 3 can be installed and positioned in the middle during subsequent use; thus realizing the hanging installation of the two.

[0070] Furthermore, the rear bumper body 6 in this invention also includes a connecting plate unit disposed on the rear bumper base 61. The connecting plate unit includes an upper connecting plate 64 and a lower connecting plate 65 disposed on the rear bumper base 61. The rear bumper body 6 is provided with an installation structure. The installation structure includes an end mounting mechanism 1 disposed at the end of the rear bumper body 6. The end mounting structure includes an integral mounting frame 11. The integral mounting frame 11 includes a frame body 101, and the two ends of the frame body 101 respectively press against the adjacent upper connecting plate 64 or lower connecting plate 65 on the rear bumper body 6. In this invention, the rear bumper base 61 is provided with an upper connecting plate 64 and a lower connecting plate 65. The upper connecting plate 64 and the lower connecting plate 65 are essentially a flange, making the vertical cross-section of the rear bumper body similar to an "I" shape. This arrangement facilitates the limitation of the installation position of the integral mounting frame 11.

[0071] Specifically, in this invention, the two ends of the integral mounting frame 11 press against the upper connecting plate 64 and the lower connecting plate 65 of the rear bumper base 61, respectively, so that the rear bumper end forms a simply supported beam load-bearing system; two connecting plates are integrally formed on the upper and lower edges of the rear bumper base 61, and the two ends of the single-piece grid-like integral mounting frame 11 simultaneously press against the two connecting plates, so that the rear bumper end forms a simply supported beam self-centering system, thereby reducing the tail surface difference to ≤0.2 mm and maintenance costs by more than 50% under thermal expansion and contraction and low-speed collision conditions.

[0072] The upper connecting plate 64 and the lower connecting plate 65 are integrally injection molded with the rear bumper base 61, which not only facilitates the subsequent installation of the rear bumper assembly, but also facilitates its use in conjunction with the integral mounting frame 11. In the future, it can also be used to diffuse the concentrated force transmitted from the frame to the rear bumper base 61 in the form of surface pressure.

[0073] In this invention, the connecting plate unit mainly includes an upper connecting plate 64 and a lower connecting plate 65; in this invention, the upper connecting plate 64 and the lower connecting plate 65 are disposed on the rear support base 61; the upper connecting plate 64 and the lower connecting plate 65 provide local reinforcement, form mounting support points, and transfer loads; and provide a "pressure-resistant interface" for subsequent installation structures.

[0074] In this invention, the end mounting mechanism 1 mainly includes an integral mounting frame 11; the integral mounting frame 11 is essentially a mounting bracket, which realizes the rigid connection between the rear bumper assembly and the end of the vehicle body; and undertakes the function of the main mounting point.

[0075] The integral mounting frame 11 includes a frame body 101 (grid-like / integrated); spanning the rear retainer body 6 area, it disperses concentrated forces and avoids local stress concentration; it increases modal frequency and suppresses vibration.

[0076] In subsequent use, the integral mounting frame 11 is installed on the vehicle body, and then the rear bumper assembly is installed on the vehicle body.

[0077] The integral mounting frame 11 presses against the rear bumper body; the pressing structure allows for a certain range of sliding / compression deformation, achieving pre-positioning before bolt tightening; the frictional contact between the connecting plate unit and the frame body 101 serves as a temporary fixation, reducing the need for tooling fixtures; the integral frame reinforces the rear bumper body in 6 sections to avoid low-frequency resonance.

[0078] Furthermore, in this invention, one end of the integral mounting frame 11 is snapped onto the upper connecting plate 64 on the rear bumper body 6, and the other end is connected to the lower connecting plate 65 on the rear bumper body 6 via fasteners; the upper connecting plate 64 is snapped onto the upper connecting plate 64 on the rear bumper body 6 via multiple buckles, while the lower connecting plate 65 is attached to the lower connecting plate 65 on the rear bumper body 6, and then, with the fasteners, the integral mounting frame 11 is fixedly installed on the rear bumper body.

[0079] During subsequent installation, the integral mounting frame 11 is required to be installed onto the vehicle body first, usually by fasteners.

[0080] During subsequent installation, the lower end of the rear bumper unit overlaps with the lower connecting plate 65, and the upper end of the rear bumper unit is connected to the slot of the upper connecting plate 64, thereby realizing the installation connection between the rear bumper unit and the integral frame.

[0081] Furthermore, the rear bumper base 61 in this invention includes a rear bumper substrate, and the end of the rear bumper substrate is provided with a raised lip 63; the lower trim panel 3 is hung on the raised lip 63 of the rear bumper body 6; the raised lip 63 is a raised structure, and the lower trim panel 3 is provided with a groove area. Subsequently, the lower trim panel 3 is overlaid on the raised lip 63 through the groove area. Based on this design, it is convenient for the lower trim panel 3 to be hung and positioned on the rear bumper body.

[0082] Furthermore, the integral mounting frame 11 described in this invention also includes a protruding bracket 12 provided on the frame body 101, the protruding bracket 12 being connected to the vehicle frame; the protruding bracket 12 has a protruding design on the integral mounting frame 11, and can be inserted into the vehicle frame during subsequent use, thereby achieving the stability of the rear bumper assembly installation. In order to facilitate the accuracy and stability of the rear bumper assembly installation position, a groove structure can be provided on the vehicle frame of this invention; to facilitate the insertion, installation and positioning of the integral mounting frame 11.

[0083] Furthermore, in this invention, the frame body 101 has a grid-like structure; the frame body 101 is arranged in close contact with the inner side of the rear bumper body 6; the frame body 101 of this invention adopts a grid-like structure, which not only ensures the structural strength of the frame body 101, but also helps to reduce the weight of the integral mounting frame. In addition, in this invention, the frame body 101 is arranged in close contact with the inner side of the rear bumper body 6; based on this design, the contact area between the integral mounting frame 11 and the rear bumper body is well guaranteed; this setting makes the integral mounting frame 11 act as a reinforcing member, better ensuring the structural strength of the rear bumper assembly end.

[0084] Furthermore, the mounting structure described in this invention also includes an upper edge mounting mechanism 2; the upper edge mounting mechanism 2 is mainly arranged on the upper end of the rear bumper body; it acts as a front-end connector and a hook, and is used in conjunction with the end mounting mechanism 1 to better ensure the installation and fixation of the rear bumper assembly on the vehicle body.

[0085] Specifically, the upper mounting mechanism 2 in this invention includes an upper mounting bracket 201; the upper mounting bracket 201 is the main structure of the upper mounting mechanism 2; the upper mounting bracket 201 includes a bracket body 21, and the bracket body 21 is provided with a snap-fit ​​unit; the bracket body 21 is provided with a limiting unit, which includes a longitudinal limiting unit and a transverse limiting unit; the snap-fit ​​unit is mainly a snap-fit ​​block on the bracket body 21, which facilitates the snap-fit ​​with the rear bumper body.

[0086] In this invention, the limiting unit plays a good role in installation limiting. The longitudinal limiting unit includes a longitudinal mounting plate 22 disposed on the bracket body 21. The longitudinal mounting plate 22 includes a longitudinal first plate 221 and a longitudinal second plate 222. The longitudinal second plate 222 is connected to the bracket body 21 through the longitudinal first plate 221. The longitudinal mounting plate 22 is an inverted L-shaped plate. The longitudinal mounting plate 22 is mounted on the upper connecting plate 64 in the rear support body 6. The lateral limiting unit includes a longitudinal... The longitudinal limiting plate on the L-plate and the snap-fit ​​groove on the upper connecting plate 64 of the rear bumper body 6; the longitudinal hanging plate 22 of the present invention forms an inverted hook structure, and in subsequent use, the longitudinal hanging plate 22 is hung upside down on the upper connecting plate 64; in the present invention, the longitudinal limiting plate is set on the inner wall of the longitudinal hanging plate 22; one function is to increase the structural strength of the longitudinal hanging plate 22, and another function is to act as a limiting component, which can cooperate with the snap-fit ​​groove on the rear bumper body to realize the installation limitation between the upper mounting bracket 201 and the rear bumper body.

[0087] In this invention, the rear bumper body is provided with two end mounting mechanisms 1 and two upper edge mounting mechanisms 2; the two end mounting mechanisms 1 are distributed at both ends of the rear bumper body, while the upper edge mounting mechanisms 2 are located in the middle area of ​​the upper end of the rear bumper body.

[0088] Furthermore, in this invention, the lower trim panel 3 is provided with a bright strip unit 4, which is embedded in the lower trim panel 3; the bright strip unit 4 includes a bright strip body, which is snapped onto the lower trim panel 3; in this invention, the bright strip unit 4 mainly serves as a warning function, and the bright strip body is essentially a reflective bright strip structure, which is snapped onto the lower trim panel 3 by a buckle.

[0089] In addition, in this invention, the bright strip body is embedded in the lower trim panel 3. Generally, a recessed groove is designed on the lower trim panel 3, and the bright strip is subsequently arranged in the recessed groove. In this invention, the bright strip body can also serve as a reinforcing member, which helps to ensure the structural strength of the lower trim panel 3. At the same time, the recessed groove designed on the lower trim panel 3 can also play a good role in weight reduction.

[0090] Furthermore, in this invention, the lower trim panel 3 is provided with a bright strip unit 4, which is embedded in the outer surface of the lower trim panel 3; the bright strip unit 4 includes a bright strip body, which is detachably snapped to the lower trim panel 3 by a snap-fit ​​structure; the bright strip body is a reflective bright strip structure, which mainly serves as a warning and can improve the lateral visibility of the vehicle in low-light environments.

[0091] In addition, the lower trim panel 3 has a recessed groove structure corresponding to the bright strip body, and the bright strip body is embedded in the recessed groove to achieve a flat installation. The recessed groove structure not only realizes the positioning and hidden installation of the bright strip body, but also has a weight reduction function, which helps to reduce the overall weight of the lower trim panel 3.

[0092] When installed, the bright strip body forms a local structural reinforcement with the lower trim panel 3, improving the structural rigidity and deformation resistance of the lower trim panel 3 in the bright strip arrangement area.

[0093] Furthermore, in this invention, the rear bumper body 6 is provided with a flow guiding unit 5 at its end; the flow guiding unit 5 is connected to the rear bumper body 6 and overlaps the end of the lower trim panel 3; in this invention, the rear bumper body 6 is provided with a flow guiding unit 5 at its end near the side of the vehicle; the flow guiding unit 5 is assembled at the end of the rear bumper body 6, generally extending forward along the X direction of the vehicle, and its downstream end overlaps the upper surface of the corresponding end of the lower trim panel 3; in this invention, a flow guiding unit 5 is provided at each end of the rear bumper body; a flow guiding groove 54 is formed between the flow guiding unit 5 and the rear bumper body; it is used to guide the airflow at the rear of the vehicle, reduce turbulence intensity and wind resistance, and at the same time cover the assembly gap between the lower trim panel 3 and the rear bumper body 6, improving the appearance and weather resistance.

[0094] Specifically, in this invention, the flow guiding unit 5 includes a flow guiding plate 501; the flow guiding plate 501 includes a first flow guiding plate 51 and a second flow guiding plate 52; the first flow guiding plate 51 is connected to the rear bumper inner panel through the second flow guiding plate 52; the second flow guiding plate 52 includes an inner panel guide body, and the inner panel guide body is provided with a flow guiding groove 54; the flow guiding groove 54 is inclined; the height of the flow guiding groove 54 near the rear of the vehicle is lower than the height of the flow guiding groove 54 away from the rear of the vehicle from the horizontal plane; in this invention, the flow guiding plate 501 and the rear bumper body are connected by a flow guiding groove 54, forming a cantilevered flow guiding structure; which can optimize the flow at the rear of the car.

[0095] In this invention, a guide channel 54 is formed through the inner plate guide. The bottom surface of the guide channel 54 is inclined relative to the horizontal plane, and the bottom elevation of the downstream end of the channel near the rear of the vehicle is lower than the bottom elevation of the upstream end of the channel away from the rear of the vehicle. The inclined guide channel 54 is used to deflect the high-pressure airflow in the rear of the vehicle downward, thereby increasing the traction of the rear wheels of the vehicle and reducing the risk of the vehicle skidding.

[0096] In this invention, the flow guiding unit 5 includes a flow guiding plate 501, which extends forward along the X direction of the vehicle and is fastened to the rear bumper body 6 at its root. A flow guiding groove 54 is formed between the side of the flow guiding plate 501 and the rear bumper body at intervals.

[0097] In this invention, the guide plate 501 includes a first guide plate 51 and a second guide plate 52. The first guide plate 51 and the second guide plate 52 are essentially inner and outer plate structures, which ensures the structural strength of the guide plate 501.

[0098] In this invention, a guide channel 54 is formed through the inner plate guide. The bottom surface of the guide channel 54 is inclined at α = 3° to 8° relative to the horizontal plane, forming a sloping structure with "high upstream and low downstream". The bottom elevation of the downstream end of the guide channel 54 near the rear of the vehicle is lower than the bottom elevation of the upstream end away from the rear of the vehicle. During operation, the high-pressure airflow in the rear of the vehicle generates a downward deflection velocity component under the guidance of the inclined bottom surface of the guide channel 54, forming a low-pressure sweeping jet, which suppresses the tail vortex and reduces the overall vehicle wind resistance. The downward deflected airflow forms a local downwash in front of the rear wheels, increasing the rear wheel ground load and improving the rear wheel grip at high speeds, thereby reducing the risk of vehicle tail-swing. At the same time, the through design of the guide channel 54 avoids the accumulation of mud and water in the channel, taking into account both weather resistance and self-cleaning function.

[0099] Furthermore, in this invention, the first guide plate 51 includes an outer guide body; the outer guide body includes a first guide base plate 511, a first guide side plate 512, and a wrapping flange 513; the first guide base plate 511 is connected to the wrapping flange 513 through the first guide side plate 512; based on this design, the outer guide body has an overall tilted L-shaped structure, and the inner guide body includes a second guide base plate 521 and a second guide side plate 522. In this invention, the inner guide body has an overall tilted L-shaped structure, and the inner guide plate 501 is subsequently placed on the outer guide plate 501; the wrapping flange 513 is disposed at the end of the first guide side plate 512; it plays a good role in installation and limiting, facilitating the embedding and installation of the inner guide body on the outer guide plate 501, and the inner guide body and the outer guide plate 501 can be connected by adhesive bonding.

[0100] In this invention, the first flow guide side plate 512 includes a main flow guide side plate 5121 and a branch flow guide side plate 5122; the main flow guide side plate 5121 and the branch flow guide side plate 5122 extend in opposite directions; the main flow guide side plate 5121 plays a lateral support and connection role, while the branch flow guide side plate 5122 plays a good bridging role, which facilitates the overlapping and fitting of the inner plate flow guide plate 501 and the lower trim plate 3.

[0101] In this invention, one end of the branch guide plate 5122 abuts against the second guide plate 52, and the other end abuts against the end of the lower trim plate 3 body; the guide channel 54 extends to the outer side of the branch guide plate 5122 in the first guide plate 51; the guide channel 54 is disposed on the second guide plate 522; in this invention, based on this design, it is convenient for airflow to pass through the guide unit 5; and the smoothness of airflow operation is guaranteed.

[0102] In this invention, the second flow guiding substrate 521 is a stepped plate, which greatly ensures the structural strength of the second flow guiding substrate 521.

[0103] In this invention, the first guide plate 51 includes an outer guide plate. In this invention, the first guide plate 511, the first guide side plate 512 and the wrapping flange 513 are integrally injection molded.

[0104] In this invention, the first flow guide side plate 512 includes a main flow guide side plate 5121 and a branch flow guide side plate 5122; in this invention, the main flow guide side plate 5121 is spaced apart from the rear bumper body; the branch flow guide side plate 5122 overlaps the rear bumper body and the lower trim plate 3.

[0105] In this invention, the front end of the branch guide plate 5122 abuts against the end of the second guide plate 52, and the rear end abuts against the end of the lower trim plate 3, so as to improve the overall rigidity of the guide plate 501 and close the assembly step difference.

[0106] In this invention, the guide channel 54 extends continuously from the second guide side plate 522 to the outer side of the branch guide side plate 5122, so that the inclined guide channel 54 penetrates the entire guide plate 501 in the front-back direction, ensuring the continuity of the downward deflection of the airflow.

[0107] In this invention, the second guide plate 52 includes an inner plate guide fluid, the inner plate guide fluid includes a second guide substrate 521, and the second guide substrate 521 is bolted to the rear retainer body 6.

[0108] The second flow guide side plate 522 and the second flow guide base plate 521 are arranged intersectingly. The flow guide groove 54 is opened through the second flow guide side plate 522. The bottom inclination angle of the groove is α = 4°–8°, and the downstream end of the groove is 2–8 mm lower than the upstream end.

[0109] The guide channel 54 forms a complete inclined channel between the second guide side plate 522 and the branch guide side plate 5122. After the airflow enters the guide channel 54, it is continuously guided downward and flows out attached to the lower trim plate 3, further reducing the tail vortex intensity and improving the rear wheel adhesion, taking into account structural rigidity, lightweight and aerodynamic performance.

[0110] Furthermore, in this invention, the second guide side plate 522 includes a second guide base 5221 and a second guide side plate 5222; the thickness of the second guide side plate 5222 is less than the thickness of the second guide base 5221; the guide channel 54 is located at the connection between the second guide base 5221 and the second guide side plate 5222; this arrangement forms an L-shaped structure, that is, the second guide base 5221 and the second guide side plate 5222 form a stepped platform, which facilitates the formation of a gap between the second guide side plate 522 and the rear guard body during subsequent use, thus facilitating the airflow guidance.

[0111] Furthermore, in this invention, the second flow guide plate 5222 is provided with a support pad 53, which is located on the side of the second flow guide plate 5222 close to the rear bumper body. The support pad 53 provides good support and can be connected to the rear bumper body by fasteners. The support pad 53 provides good support and protection, preventing the second flow guide plate 5222 from being suspended.

[0112] Furthermore, in this invention, the outer panel guide fluid is connected to the lower trim panel 3 through a fastening unit; the fastening unit plays a good bridging role, facilitating the hanging and limiting of the outer panel guide fluid and the lower trim panel 3.

[0113] In this invention, the fastening unit includes a first fastening flange 55 disposed at the end of the outer panel fluid guide and a second fastening flange 311 disposed at the end of the lower trim panel 3; both the first fastening flange 55 and the second fastening flange 311 are L-shaped; the first fastening flange 55 and the second fastening flange 311 are mutually hooked and limited; based on the above design, the first fastening flange 55 and the second fastening flange 311 are both hook structures, which facilitates the hooking and installation of the outer panel fluid guide at the end of the lower trim panel 3.

[0114] Key points of the technical solution of this invention:

[0115] Modular design:

[0116] The rear bumper assembly consists of two main modules: the rear bumper body 6 and the lower trim panel 3. Precise positioning is achieved through the insertion of protrusions 62 and grooves.

[0117] The lower trim panel 3 can be attached to the raised lip 63 of the rear bumper body 6, simplifying assembly.

[0118] Innovative installation structure:

[0119] Integrated installation frame 11: The grid-like frame body 101 spans the rear retainer body 6, with both ends pressing against the upper connecting plate 64 and the lower connecting plate 65, one end snapped in and the other end fastened.

[0120] Upper edge mounting mechanism 2: Longitudinal / lateral limiting is achieved through an inverted L-shaped hanging plate and a longitudinal limiting plate.

[0121] Traffic diversion function integration:

[0122] The flow guiding unit 5 includes a first flow guiding plate 51 and a second flow guiding plate 52, and the flow guiding channel 54 is designed with an inclined shape to optimize airflow.

[0123] The outer panel fluid guide is connected to the lower trim panel 3 through a fastening unit to enhance structural stability.

[0124] Combining decoration and function:

[0125] Bright strip unit 4 is embedded in the lower trim panel 3, which enhances the appearance while maintaining a secure connection.

[0126] In terms of the overall technical solution:

[0127] Improved assembly efficiency of the rear support body: Tool-free design such as plug-in, hook-in, and snap-in reduces assembly time.

[0128] Structural strength: The monolithic frame and multiple limiting units enhance vibration resistance.

[0129] The inclined guide channel 54 can improve airflow at the rear of the vehicle.

[0130] Example 1:

[0131] The present invention discloses a self-positioning rear bumper assembly, which mainly includes a rear bumper body 6, a lower trim panel 3, an integral mounting frame 11, an upper mounting bracket 201, a deflector 501, and a bright strip body.

[0132] Pre-assembled - rear bumper body 6 and lower trim panel 3:

[0133] Insert the rear bumper body 6 into the lower trim panel 3, and then position the rear bumper body 6 and the lower trim panel 3 laterally.

[0134] The groove at the top of the lower trim panel 3 is attached to the raised lip 63 at the end of the rear retaining plate; thus achieving vertical pre-attachment.

[0135] At this point, the lower trim panel 3 can be held in place with one hand, awaiting subsequent tightening.

[0136] Installation of the integrated mounting frame 11:

[0137] The frame body 101 has a grid structure and fastener holes are provided on the frame body 101. The fasteners can be screws or bolts.

[0138] The integral mounting frame 11 is first installed on the vehicle body, and the rear bumper unit is then connected to the vehicle body through the integral mounting frame 11.

[0139] Installation of upper mounting mechanism 2:

[0140] The inverted L-shaped longitudinal mounting plate 22 of the upper mounting bracket 201 is hung along the -Z direction to the edge of the upper connecting plate 64; the longitudinal limiting plate simultaneously slides into the corresponding snap-fit ​​groove of the upper connecting plate 64 to provide Y-direction limiting.

[0141] Installation of flow guide unit 5:

[0142] The second guide plate 52 is glued and fixed to the first guide plate 51.

[0143] The outer guide plate of the deflector plate 501 is attached to the end of the lower trim plate 3.

[0144] Installation of Bright Strip Unit 4:

[0145] The bright strip is attached to the lower trim panel 3.

[0146] Through this embodiment, the rear bumper assembly achieves an integrated solution of "tool-free pre-mounting + grid frame simply supported beam + inclined guide channel + bright strip reinforcement", which takes into account assembly efficiency, structural strength, aerodynamic performance and appearance refinement.

[0147] Obviously, the specific implementation of this invention is not limited to the above-described methods. Any non-substantial improvements made using the inventive concept and technical solution of this invention are within the protection scope of this invention.

Claims

1. A self-positioning rear bumper assembly, characterized in that, The rear bumper unit includes a rear bumper body, and the rear bumper body is connected to a lower trim panel; the rear bumper body is connected to the lower trim panel. The rear protection body includes a rear protection main body; the rear protection main body includes a rear protection substrate; The lower trim panel includes a trim panel body; the trim panel body includes a trim panel substrate; A positioning unit is provided between the rear retainer substrate and the trim panel substrate; The positioning unit includes a plugging protrusion on the rear bumper base and a plugging groove on the trim panel base; the rear bumper base is plugged into the plugging groove of the trim panel base through the plugging protrusion.

2. The self-positioning rear bumper assembly according to claim 1, characterized in that, The positioning unit is arranged in the middle area between the rear bumper base and the trim panel base.

3. The self-positioning rear bumper assembly according to claim 1, characterized in that, The rear bumper body also includes a connecting plate unit disposed on the rear bumper base, the connecting plate unit including an upper connecting plate and a lower connecting plate disposed on the rear bumper base; The rear protection body is provided with an installation structure; The mounting structure includes an end mounting mechanism disposed at the end of the rear guard body; The end mounting structure includes an integral mounting frame; The integral installation frame includes a frame body, and the two ends of the frame body respectively press against the adjacent upper or lower connecting plate on the rear guard body.

4. A self-positioning rear bumper assembly according to claim 3, characterized in that, One end of the integral mounting frame is snapped into the upper connecting plate on the rear bumper body, and the other end is connected to the lower connecting plate on the rear bumper body by fasteners.

5. A self-positioning rear bumper assembly according to claim 3, characterized in that, The rear bumper body includes a rear bumper base plate, and the end of the rear bumper base plate is provided with a raised lip; the lower trim plate is attached to the raised lip of the rear bumper body.

6. A self-positioning rear bumper assembly according to claim 1, characterized in that, The integral mounting frame also includes a protruding bracket on the frame body, which is connected to the vehicle body frame.

7. A self-positioning rear bumper assembly according to claim 1, characterized in that, The main frame has a grid-like structure; the main frame is fitted to the inner side of the rear retainer.

8. A self-positioning rear bumper assembly according to claim 1, characterized in that, The mounting structure also includes an upper edge mounting mechanism; The upper edge mounting mechanism includes an upper mounting bracket; The upper mounting bracket includes a bracket body, on which a buckle unit is provided; the bracket body is provided with a limiting unit, which includes a longitudinal limiting unit and a lateral limiting unit. The longitudinal limiting unit includes a longitudinal mounting plate disposed on the support body. The longitudinal mounting plate includes a longitudinal first plate and a longitudinal second plate. The longitudinal second plate is connected to the support body through the longitudinal first plate. The longitudinal mounting plate is an inverted L-shaped plate. The longitudinal mounting plate is mounted on the upper connecting plate in the rear protection body; The lateral limiting unit includes a longitudinal limiting plate disposed on the longitudinal L-plate and a snap-fit ​​groove disposed on the upper connecting plate of the rear guard body.

9. A self-positioning rear bumper assembly according to claim 1, characterized in that, The lower trim panel is provided with a bright strip unit, which is embedded in the lower trim panel; the bright strip unit includes a bright strip body, which is snapped onto the lower trim panel.

10. A self-positioning rear bumper assembly according to claim 1, characterized in that, The rear bumper body has a flow guiding unit at its end; the flow guiding unit is connected to the rear bumper body and overlaps the end of the lower trim panel.

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