Truck bumper positioning structure and assembly method

Abstract

The application belongs to the technical field of automobile manufacturing, and discloses a truck bumper positioning structure and an assembling method, which comprise a support, a middle cross beam, an upper cross beam, a headlamp shell, a middle assembly, a side assembly, an air inlet grid, a turnover pedal and a decorative plate, and differentiated positioning structures are arranged on the support, the middle cross beam, the upper cross beam, the headlamp shell, the middle assembly, the side assembly, the air inlet grid, the turnover pedal and the decorative plate; the middle cross beam, the upper cross beam, the headlamp shell, the middle assembly, the side assembly, the air inlet grid and the turnover pedal are positioned and assembled on the support; and the decorative plate is positioned and assembled on the middle assembly. The differentiated positioning structures are designed according to the castings, stamping parts and injection molded parts to improve manufacturing convenience, the positioning positions are developed according to the functional requirements of the appearance parts and the structural parts, the strength and the appearance are double optimized, the positioning structure and the assembling method are cooperatively designed to achieve the goal that the bumper appearance is excellent, the connection is reliable and the manufacturing is easy.

Description

Technical Field

[0001] This invention belongs to the field of automobile manufacturing technology, specifically relating to a truck bumper positioning structure and assembly method. Background Technology

[0002] In the commercial truck sector, bumpers are an indispensable core component, serving a dual function of safety protection and aesthetic enhancement. They are not only a crucial barrier ensuring vehicle safety but also a key element reflecting the overall vehicle engineering design language and enhancing the vehicle's visual appeal. Their protective performance directly relates to the integrity of the vehicle's structure during operation and pedestrian safety, while their appearance directly impacts the vehicle's visual harmony and market competitiveness. Therefore, truck bumpers must not only meet stringent safety performance requirements during manufacturing but also strictly control dimensional accuracy to ensure a smooth appearance and a perfect fit.

[0003] In existing technologies, truck bumpers typically have a complex structure, mainly composed of multiple components such as a bumper frame, left / center / right split parts, air intake grille, and headlight mounting section. The manufacturing processes for these components vary significantly, encompassing casting, stamping, injection molding, and other processing methods. Due to the differences in materials and molding characteristics of each component, achieving precise positioning of these parts during manufacturing and assembly becomes a key challenge for improving bumper manufacturing efficiency and ensuring product consistency.

[0004] Currently, the positioning design for truck bumpers mostly adopts a standardized structure, failing to fully incorporate the different molding characteristics and structural requirements of castings, stampings, and injection molded parts for differentiated design. This results in insufficient positioning accuracy, poor manufacturing convenience, and some positioning structures even conflicting with the functional requirements of the components. For example, if the positioning design for appearance parts is too cumbersome, it is easy to leave machining marks on the surface, affecting the aesthetics; while if the positioning design for structural parts is not strong enough, it will lead to poor connection reliability after assembly, failing to meet safety protection requirements.

[0005] Meanwhile, the existing bumper positioning system and assembly method lack coordinated design. The selection of positioning positions does not fully take into account both structural strength and appearance, often resulting in a trade-off: either the positioning structure is simplified to ensure a flat appearance, leading to weak component connections and low assembly accuracy; or the positioning structure is added to improve connection reliability, sacrificing the integrity of the appearance and ease of manufacturing.

[0006] In summary, current truck bumper manufacturing processes suffer from unreasonable positioning structure design, insufficient differentiation, and poor coordination between positioning systems and assembly methods. This makes it difficult to simultaneously achieve multiple goals such as excellent appearance, reliable connection, and ease of manufacturing, and fails to meet the demands of commercial trucks for high performance, high consistency, and high production efficiency in bumpers. Therefore, there is an urgent need for a truck bumper positioning and assembly technology solution that can address the aforementioned technical problems. Summary of the Invention

[0007] The purpose of this invention is to provide a truck bumper positioning structure and assembly method, focusing on the actual use and manufacturing process of the bumper. Differentiated positioning structures are designed for castings, stampings and injection molded parts to improve manufacturing convenience. Positioning positions are developed according to the functional requirements of appearance parts and structural parts to achieve dual optimization of strength and appearance. Through the coordinated design of positioning system and assembly method, the goal of achieving a bumper with excellent appearance, reliable connection and easy manufacturing is finally achieved.

[0008] The specific details of the plan are as follows:

[0009] A truck bumper positioning structure includes a bracket, a middle crossbeam, an upper crossbeam, a headlight housing, a central assembly, a side assembly, an air intake grille, a tilting pedal, and a decorative panel. The bracket, middle crossbeam, upper crossbeam, headlight housing, central assembly, side assembly, air intake grille, tilting pedal, and decorative panel are all provided with differentiated positioning structures. The middle crossbeam, upper crossbeam, headlight housing, central assembly, side assembly, air intake grille, and tilting pedal are all positioned and assembled onto the bracket through corresponding positioning structures, and the decorative panel is positioned and assembled onto the central assembly through corresponding positioning structures.

[0010] The bumper of this invention uses a bracket as its frame, which is made of aluminum alloy, cast and machined to ensure dimensional accuracy. The bracket has good rigidity, dimensional stability, and can be machined with various positioning structures such as round holes, round pins, diamond pins, and threaded holes. All other components of the bumper, except for the decorative panel, are positioned and assembled onto the bracket. The bracket has large round holes as hanging holes for installation and positioning of the bumper during hoisting and transportation.

[0011] The middle crossbeam is made of iron, and its assembly and positioning structure consists of four round holes, which are the positioning pin holes for the middle crossbeam. The corresponding positioning structure on the bracket consists of four round pins, which are the positioning pins for the middle crossbeam. There are two crossbeam positioning pin holes on each of the left and right brackets. The upper crossbeam's assembly and positioning structure consists of two round holes, which are the positioning pin holes for the crossbeam. The corresponding positioning structure on the bracket consists of two round pins, which are the positioning pins for the crossbeam.

[0012] The headlight housing is made of plastic. The assembly and positioning structure consists of four cross pins, two for each headlight. The corresponding positioning structure on the bracket consists of four round holes, two for each headlight housing.

[0013] The central assembly is made of iron. Its main positioning structure uses a round hole (the central assembly main positioning hole) and an oblong hole (the central assembly secondary positioning hole). The corresponding positioning structure on the bracket consists of two round pins (one for the central assembly and one for the side assemblies), with one round pin on each of the left and right brackets. These round pins are shared by both the central and side assemblies.

[0014] The side assembly is made of iron, and its positioning structure consists of four round holes, which are the main positioning holes of the side assembly, with two round holes on the lower part of each side assembly. The corresponding main positioning structure on the bracket consists of two round pins, which are the positioning pins of the middle assembly and the side assembly, with one round pin on each of the left and right brackets. This round pin is shared with the middle assembly. The side assembly also includes two secondary positioning holes, and the corresponding positioning structure on the bracket consists of two diamond-shaped pins, with one diamond-shaped pin on each of the left and right brackets.

[0015] The air intake grille is made of plastic, and its positioning structure consists of two round holes, known as air intake grille positioning holes. Correspondingly, the bracket has two threaded holes, known as air intake grille positioning threaded holes. The air intake grille positioning holes are 0.5mm larger than the air intake grille positioning threaded holes. Preferably, the specifications of the air intake grille positioning threaded holes are M8, and the diameter of the air intake grille positioning holes is 8.5mm. The gap between the air intake grille and surrounding components is avoided through design, making it aesthetically insignificant. Therefore, M8 bolts are used in conjunction with the 8.5mm diameter holes for positioning and assembly. This method balances aesthetic quality and cost.

[0016] The flip pedal is made of iron, and its positioning structure consists of two round holes, namely the flip pedal positioning pin holes. The corresponding positioning structure on the bracket consists of two diamond-shaped pins, namely the flip pedal positioning diamond pins, with one diamond pin on each of the left and right brackets.

[0017] The decorative panel is made of plastic, and its positioning structure consists of two cross pins: a main positioning cross pin and two secondary positioning cross pins. These two cross pins are symmetrically positioned on the left and right decorative panels. The main positioning structure on the central assembly corresponding to the main positioning pins consists of two round holes, which are the main positioning holes for the decorative panel. The secondary positioning structure on the central assembly corresponding to the secondary positioning pins consists of two oblong holes, which are the secondary positioning holes for the decorative panel.

[0018] The bumper is assembled using the actual vehicle posture. First, the left and right brackets are hoisted onto the tooling. Next, the middle crossbeam and the upper crossbeam are positioned with the bracket pin holes. After the middle and upper crossbeams are positioned, ordinary bolts are used to assemble the bumper frame. Then, using the pin hole structure, the headlights, the middle assembly, and the side assemblies are positioned and assembled onto the bracket in sequence. Next, the air intake grille is assembled onto the threaded holes of the bracket using bolts. Then, the flip-up pedal is assembled onto the bracket using the pin hole positioning structure. During the assembly process, the foot pedal position is adjusted. Finally, the decorative panel is positioned onto the middle assembly using the pin hole structure and the buckles are fastened. After the assembly is completed, the bumper can be transported together with the tooling.

[0019] This invention provides a novel positioning structure system and assembly method for truck bumpers, which not only ensures good dimensional accuracy but also provides reliable connections and is easy to assemble.

[0020] Furthermore, the bracket includes a left bracket and a right bracket. The positioning structure of the bracket includes two suspension holes, four middle crossbeam positioning pins, two upper crossbeam positioning pins, four headlight housing positioning pin holes, two middle assembly and side assembly positioning pins, two side assembly positioning diamond pins, two air intake grille positioning threaded holes, and two tilting pedal positioning diamond pins. The two suspension holes are symmetrically arranged at corresponding positions on the adjacent frames of the left and right brackets for installation positioning during bumper hoisting and transportation. The four middle crossbeam positioning pins are symmetrically arranged in pairs at corresponding positions on the adjacent frames of the left and right brackets for positioning in conjunction with the middle crossbeam positioning structure. The two upper crossbeam positioning pins are respectively arranged at corresponding positions on the adjacent frames of the left and right brackets for positioning in conjunction with the upper crossbeam positioning structure. The four headlight housing positioning pin holes are symmetrically arranged in pairs. Positioned on the middle and outer edges of the left and right brackets, these pins cooperate with the headlight housing's positioning structure for positioning. Two central assembly and side assembly positioning pins are symmetrically positioned on the bottom edges of the left and right brackets, respectively, to cooperate with the positioning structures of the central and side assemblies for positioning. Two side assembly positioning diamond pins are symmetrically positioned on the corresponding edges of the left and right brackets, for auxiliary positioning in cooperation with the side assembly's positioning structure. Two air intake grille positioning threaded holes are symmetrically positioned on the adjacent edges of the left and right brackets, for positioning in cooperation with the air intake grille's positioning structure. Two flip pedal positioning diamond pins are symmetrically positioned on the adjacent edges of the left and right brackets, for positioning in cooperation with the flip pedal's positioning structure.

[0021] Furthermore, the positioning structure of the middle crossbeam includes four middle crossbeam positioning pin holes, which are set in pairs at corresponding positions on the left and right ends of the middle crossbeam. The four middle crossbeam positioning pins are matched and inserted into the four middle crossbeam positioning pin holes. The positioning structure of the upper crossbeam includes two upper crossbeam positioning pin holes, which are set in corresponding positions on the left and right ends of the upper crossbeam. The two upper crossbeam positioning pins are matched and inserted into the two upper crossbeam positioning pin holes.

[0022] Furthermore, the headlight housing includes a left headlight housing and a right headlight housing. The positioning structure of the headlight housing includes four headlight housing positioning cross pins. The four headlight housing positioning cross pins are symmetrically arranged in pairs at corresponding positions on the left and right headlight housings. The four headlight housing positioning cross pins are matched and inserted into the four headlight housing positioning pin holes.

[0023] Furthermore, the positioning structure of the central assembly includes a main positioning hole, a secondary positioning hole, two main positioning holes for the decorative panels, and two secondary positioning holes for the decorative panels. The main positioning hole is a round pin hole, and the secondary positioning holes are oblong holes. The main positioning hole is located on the left side of the central assembly and matches the position of the central assembly and side assembly positioning pins on the left bracket. The secondary positioning hole is located on the right side of the central assembly and matches the position of the central assembly and side assembly positioning pins on the right bracket. The central assembly and side assembly positioning pins on the left bracket are matched and inserted into the main positioning hole of the central assembly, and the central assembly and side assembly positioning pins on the right bracket are matched and inserted into the secondary positioning hole of the central assembly. The two main positioning holes and two secondary positioning holes for the decorative panels are respectively located at corresponding positions on the central assembly and are used to cooperate with the positioning structure of the decorative panels for positioning.

[0024] Furthermore, the side assembly includes a left side assembly and a right side assembly. The positioning structure of the side assembly includes two main positioning holes and two auxiliary positioning holes. The two main positioning holes are symmetrically arranged below the left and right side assemblies and correspond to the positions of the two middle assemblies and the side assembly positioning pins. The two auxiliary positioning holes are symmetrically arranged above the left and right side assemblies and correspond to the positions of the two side assembly positioning diamond pins. The two middle assemblies and the side assembly positioning pins are respectively matched and inserted into the two main positioning holes of the side assembly, and the two side assembly positioning diamond pins are respectively matched and inserted into the two auxiliary positioning holes of the side assembly.

[0025] Furthermore, the positioning structure of the air intake grille includes two air intake grille positioning holes, which are respectively located on the left and right ends of the air intake grille. The diameter of the air intake grille positioning holes is 0.5mm larger than the diameter of the air intake grille positioning threaded holes. The two air intake grille positioning holes and the two air intake grille positioning threaded holes are matched and aligned. The air intake grille is fixed to the corresponding bracket by bolts that match the air intake grille positioning threaded holes, which pass through the air intake grille positioning holes and the aligned air intake grille positioning threaded holes in sequence.

[0026] Furthermore, the positioning structure of the flip pedal includes two flip pedal positioning pin holes, which are respectively located at the corresponding positions on the left and right ends of the flip pedal, and two flip pedal positioning diamond pins are respectively matched and inserted into the two flip pedal positioning pin holes.

[0027] Furthermore, the decorative panel includes a left decorative panel and a right decorative panel. The positioning structure of the decorative panel includes two main positioning cross pins and two secondary positioning cross pins. The two main positioning cross pins and the two secondary positioning cross pins are respectively disposed on the left decorative panel and the right decorative panel, and the positions of the two main positioning cross pins correspond to the positions of the two main positioning holes. The positions of the two secondary positioning cross pins correspond to the positions of the two secondary positioning holes. The two main positioning cross pins are respectively matched and inserted into the two main positioning holes, and the two secondary positioning cross pins are matched and inserted into the two secondary positioning holes.

[0028] A method for assembling a truck bumper, utilizing the aforementioned truck bumper positioning structure, wherein the bumper is assembled in the actual vehicle posture, the steps include:

[0029] S1, Suspension bracket: The left and right brackets are suspended on the fixture. The fixture is equipped with two hooks that match the position of the suspension holes. The two hooks are at the same horizontal height and are theoretically the same distance from the suspension holes on the left and right brackets.

[0030] S2. Positioning and assembly of the bracket: First, pass the middle crossbeam positioning pin through the corresponding middle crossbeam positioning pin hole, then pass the upper crossbeam positioning pin through the corresponding upper crossbeam positioning pin hole, and finally use bolts to tighten and assemble the positioned middle crossbeam and upper crossbeam onto the bracket.

[0031] S3. Positioning and assembly of exterior components, including:

[0032] S31. Headlight housing assembly: Pass the headlight housing positioning cross pin through the corresponding headlight housing positioning pin hole, and then tighten the headlight assembly bolts.

[0033] S32. Assembly of the middle assembly: First, fit the main positioning hole of the middle assembly into the positioning pins of the middle assembly and the side assembly on the left bracket. Then, fit the auxiliary positioning hole of the middle assembly into the positioning pins of the middle assembly and the side assembly on the right bracket. Finally, install and tighten the assembly bolts of the middle assembly.

[0034] S33. Assembly of the side assembly: First, fit the main positioning hole on the left side assembly into the positioning pins of the middle assembly and side assembly on the left bracket. Then, fit the auxiliary positioning hole on the left side assembly into the positioning diamond pin of the left side assembly. Finally, install and tighten the assembly bolts of the left side assembly. Then, fit the main positioning hole on the right side assembly into the positioning pins of the middle assembly and side assembly on the right bracket. Then, fit the auxiliary positioning hole on the right side assembly into the positioning diamond pin of the right side assembly. Finally, install and tighten the assembly bolts of the right side assembly.

[0035] S34. Assembly of the air intake grille: First, align the air intake grille positioning hole with the air intake grille positioning threaded hole, then insert the bolt and tighten it.

[0036] S35. Assembly of the flip pedal: Fit the flip pedal positioning pin hole into the corresponding flip pedal positioning diamond pin, adjust the position of the flip pedal, and then install and tighten the assembly bolts.

[0037] S36. Assembly of decorative panels: Align the main positioning cross pin and the secondary positioning cross pin of the left decorative panel with the main positioning hole and the secondary positioning hole of the left decorative panel respectively, and then push hard to make the buckle fasten. Then align the main positioning cross pin and the secondary positioning cross pin of the right decorative panel with the main positioning hole and the secondary positioning hole of the right decorative panel respectively, and then push hard to make the buckle fasten.

[0038] S4. Transportation: After assembly, the bumper is transported while suspended on the tooling. When it needs to be assembled into the vehicle, the bumper can be removed from the tooling.

[0039] Compared with the prior art, the present invention has the following advantages:

[0040] This invention focuses on the practical application and manufacturing process of bumpers. It designs differentiated positioning structures for castings, stampings, and injection molded parts to improve manufacturing convenience. It develops positioning positions according to the functional requirements of appearance and structural parts to achieve dual optimization of strength and appearance. Through the collaborative design of positioning structures and assembly methods, it achieves the goal of bumpers with excellent appearance, reliable connection, and ease of manufacturing. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the bumper frame component structure of the present invention.

[0042] Figure 2 This is a schematic diagram of the bumper exterior component structure of the present invention.

[0043] Figure 3 This is a schematic diagram of the bracket positioning structure of the present invention.

[0044] Figure 4 This is a schematic diagram of the middle crossbeam positioning structure of the present invention.

[0045] Figure 5 This is a schematic diagram of the upper crossbeam positioning structure of the present invention.

[0046] Figure 6 This is a schematic diagram of the headlight positioning structure of the present invention.

[0047] Figure 7 This is a schematic diagram of the positioning structure of the middle assembly of the present invention.

[0048] Figure 8 This is a schematic diagram of the side assembly positioning structure of the present invention.

[0049] Figure 9 This is a schematic diagram of the air intake grille positioning structure of the present invention.

[0050] Figure 10 This is a schematic diagram of the flip pedal positioning structure of the present invention.

[0051] Figure 11 This is a schematic diagram of the decorative panel positioning structure of the present invention.

[0052] In the picture:

[0053] 1. Bracket; 1.1. Suspension hole; 1.2. Middle crossbeam positioning pin; 1.3. Upper crossbeam positioning pin; 1.4. Headlight housing positioning pin hole; 1.5. Middle assembly and side assembly positioning pins; 1.6. Side assembly positioning diamond pin; 1.7. Air intake grille positioning threaded hole; 1.8. Tilting pedal positioning diamond pin; 2. Middle crossbeam; 2.1. Middle crossbeam positioning pin hole; 3. Upper crossbeam; 3.1. Upper crossbeam positioning pin hole; 4. Headlight housing; 4.1. Headlight housing positioning pin hole 5. Middle Assembly; 5.1. Main positioning hole of the middle assembly; 5.2. Secondary positioning hole of the middle assembly; 5.3. Main positioning hole of the decorative panel; 5.4. Secondary positioning hole of the decorative panel; 6. Side Assembly; 6.1. Main positioning hole of the side assembly; 6.2. Secondary positioning hole of the side assembly; 7. Air intake grille; 7.1. Positioning hole of the air intake grille; 8. Flip pedal; 8.1. Positioning pin hole of the flip pedal; 9. Decorative panel; 9.1. Main positioning cross pin of the decorative panel; 9.2. Secondary positioning cross pin of the decorative panel. Detailed Implementation

[0054] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all of them.

[0055] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0056] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0057] The following combination Figures 1-11 The invention will be illustrated by the following examples:

[0058] Example 1:

[0059] A truck bumper positioning structure, see Figure 1 and Figure 2 As shown, the assembly includes a bracket 1, a middle crossbeam 2, an upper crossbeam 3, a headlight housing 4, a central assembly 5, a side assembly 6, an air intake grille, a flip-up pedal, and a decorative panel. The bracket 1, middle crossbeam 2, upper crossbeam 3, headlight housing 4, central assembly 5, side assembly 6, air intake grille 7, flip-up pedal 8, and decorative panel 9 are all equipped with differentiated positioning structures. The middle crossbeam 2, upper crossbeam 3, headlight housing 4, central assembly 5, side assembly 6, air intake grille 7, and flip-up pedal 8 are all positioned and assembled onto the bracket 1 through corresponding positioning structures, and the decorative panel 9 is positioned and assembled onto the central assembly 5 through corresponding positioning structures.

[0060] See Figure 3As shown, bracket 1 includes a left bracket and a right bracket. The positioning structure of bracket 1 includes two suspension holes 1.1, four middle crossbeam positioning pins 1.2, two upper crossbeam positioning pins 1.3, four headlight housing positioning pin holes 1.4, two middle assembly and side assembly positioning pins 1.5, two side assembly positioning diamond pins 1.6, two air intake grille positioning threaded holes 1.7, and two tilting pedal positioning diamond pins 1.8. The two suspension holes 1.1 are symmetrically arranged at corresponding positions on the adjacent frames of the left and right brackets for installation positioning during bumper hoisting and transportation. The four middle crossbeam positioning pins 1.2 are symmetrically arranged in pairs at corresponding positions on the adjacent frames of the left and right brackets for positioning in conjunction with the positioning structure of the middle crossbeam 2. The two upper crossbeam positioning pins 1.3 are respectively arranged at corresponding positions on the adjacent frames of the left and right brackets for positioning in conjunction with the positioning structure of the upper crossbeam 3. The four headlight housing positioning pin holes 1.4 Two sets of symmetrically arranged pins 1.5 are positioned on the corresponding positions of the middle and outer edges of the left and right brackets, respectively, for positioning in conjunction with the positioning structure of the headlight housing 4; two central assembly and side assembly positioning pins 1.5 are symmetrically arranged on the corresponding positions of the bottom edges of the left and right brackets, for positioning the central assembly 5 and side assembly 6 in sequence with the positioning structures of the central assembly and side assembly 6; two side assembly positioning diamond pins 1.6 are symmetrically arranged on the corresponding positions of the adjacent edges of the left and right brackets, for auxiliary positioning in conjunction with the positioning structure of the side assembly 6; two air intake grille positioning threaded holes 1.7 are symmetrically arranged on the corresponding positions of the adjacent edges of the left and right brackets, for positioning in conjunction with the positioning structure of the air intake grille 7; two flip pedal positioning diamond pins 1.8 are symmetrically arranged on the corresponding positions of the adjacent edges of the left and right brackets, for positioning in conjunction with the positioning structure of the flip pedal 8.

[0061] See Figure 4 As shown, the positioning structure of the middle crossbeam 2 includes four middle crossbeam positioning pin holes 2.1. The four middle crossbeam positioning pin holes 2.1 are arranged in pairs at corresponding positions on the left and right ends of the middle crossbeam 2. The four middle crossbeam positioning pins 1.2 are matched and inserted into the four middle crossbeam positioning pin holes 2.1. Figure 5 As shown, the positioning structure of the upper crossbeam 3 includes two upper crossbeam positioning pin holes 3.1. The two upper crossbeam positioning pin holes 3.1 are respectively set at corresponding positions at the left and right ends of the upper crossbeam 3. The two upper crossbeam positioning pins 1.3 are matched and inserted into the two upper crossbeam positioning pin holes 3.1.

[0062] See Figure 6As shown, the headlight housing 4 includes a left headlight housing and a right headlight housing. The positioning structure of the headlight housing 4 includes four headlight housing positioning cross pins 4.1. The four headlight housing positioning cross pins 4.1 are symmetrically arranged in pairs at corresponding positions on the left headlight housing and the right headlight housing. The four headlight housing positioning cross pins 4.1 are matched and inserted into the four headlight housing positioning pin holes 1.4.

[0063] See Figure 7 As shown, the positioning structure of the middle assembly 5 includes a main positioning hole 5.1, a secondary positioning hole 5.2, two main positioning holes 5.3 for the decorative panels, and two secondary positioning holes 5.4 for the decorative panels. The main positioning hole 5.1 is a round pin hole, and the secondary positioning hole 5.2 is an oblong hole. The main positioning hole 5.1 is located on the left side of the middle assembly 5 and matches the position of the positioning pins 1.5 of the middle assembly and the side assembly on the left bracket. The secondary positioning hole 5.2 is located on the right side of the middle assembly 5. The positioning pins 1.5 of the middle assembly and side assembly on the right bracket are matched with the positioning pins 1.5 of the middle assembly and side assembly on the left bracket. The positioning pins 1.5 of the middle assembly and side assembly on the left bracket are matched and inserted into the main positioning hole 5.1 of the middle assembly. The positioning pins 1.5 of the middle assembly and side assembly on the right bracket are matched and inserted into the secondary positioning hole 5.2 of the middle assembly. The two main positioning holes 5.3 and the two secondary positioning holes 5.4 of the decorative panel are respectively set at the corresponding positions of the middle assembly 5, and are used to cooperate with the positioning structure of the decorative panel 9 for positioning.

[0064] See Figure 8 As shown, the side assembly 6 includes a left side assembly and a right side assembly. The positioning structure of the side assembly 6 includes two main positioning holes 6.1 and two secondary positioning holes 6.2. The two main positioning holes 6.1 are symmetrically arranged below the left and right side assemblies and correspond to the positions of the two middle assemblies and the side assembly positioning pins 1.5. The two secondary positioning holes 6.2 are symmetrically arranged above the left and right side assemblies and correspond to the positions of the two side assembly positioning diamond pins 1.6. The two middle assemblies and the side assembly positioning pins 1.5 are respectively matched and inserted into the two main positioning holes 6.1, and the two side assembly positioning diamond pins 1.6 are respectively matched and inserted into the two secondary positioning holes 6.2.

[0065] See Figure 9As shown, the positioning structure of the air intake grille 7 includes two air intake grille positioning holes 7.1, which are respectively located on the left and right ends of the air intake grille. The diameter of the air intake grille positioning holes 7.1 is 0.5 mm larger than the diameter of the air intake grille positioning threaded holes 1.7. The two air intake grille positioning holes 7.1 and the two air intake grille positioning threaded holes 1.7 are matched and aligned. The air intake grille is fixed to the corresponding bracket by bolts that match the air intake grille positioning threaded holes 1.7, which pass through the air intake grille positioning holes 7.1 and the aligned air intake grille positioning threaded holes 1.7 in sequence.

[0066] See Figure 10 As shown, the positioning structure of the flip pedal 8 includes two flip pedal positioning pin holes 8.1. The two flip pedal positioning pin holes 8.1 are respectively set at the corresponding positions at the left and right ends of the flip pedal 8. The two flip pedal positioning diamond pins 1.8 are respectively matched and inserted into the two flip pedal positioning pin holes 8.1.

[0067] See Figure 11 As shown, the decorative panel 9 includes a left decorative panel and a right decorative panel. The positioning structure of the decorative panel 9 includes two main positioning cross pins 9.1 and two secondary positioning cross pins 9.2. The two main positioning cross pins 9.1 and the two secondary positioning cross pins 9.2 are respectively disposed on the left decorative panel and the right decorative panel. The positions of the two main positioning cross pins 9.1 and the two main positioning holes 5.3 correspond to the positions of the two secondary positioning cross pins 9.2 and the two secondary positioning holes 5.4. The two main positioning cross pins 9.1 are respectively matched and inserted into the two main positioning holes 5.3, and the two secondary positioning cross pins 9.2 are matched and inserted into the two secondary positioning holes 5.4.

[0068] Example 2:

[0069] The present invention also provides a method for assembling a truck bumper, which utilizes the aforementioned truck bumper positioning structure, and includes the following steps:

[0070] S1, Suspension bracket: The left and right brackets are suspended on the fixture. The fixture is equipped with two hooks that match the position of the suspension hole 1.1. The two hooks are at the same horizontal height and are theoretically the same distance from the suspension hole 1.1 on the left and right brackets.

[0071] S2. Positioning and assembly of the bracket: First, pass the middle crossbeam positioning pin 1.2 through the corresponding middle crossbeam positioning pin hole 2.1, then pass the upper crossbeam positioning pin 1.3 through the corresponding upper crossbeam positioning pin hole 3.1, and finally use bolts to tighten and assemble the middle crossbeam 2 and upper crossbeam 3 that have been positioned onto the bracket.

[0072] S3. Positioning and assembly of exterior components, including:

[0073] S31. Assembly of headlight housing 4: Pass the headlight housing positioning cross pin 4.1 through the corresponding headlight housing positioning pin hole 1.4, and then tighten the headlight assembly bolts.

[0074] S32. Assembly of the middle assembly 5: First, fit the main positioning hole 5.1 of the middle assembly into the positioning pin 1.5 of the middle assembly and the side assembly on the left bracket. Then, fit the auxiliary positioning hole 5.2 of the middle assembly into the positioning pin 1.5 of the middle assembly and the side assembly on the right bracket. Then, install and tighten the assembly bolts of the middle assembly 5.

[0075] S33. Assembly of side assembly 6: First, fit the main positioning hole on the left side assembly into the positioning pin 1.5 of the middle assembly and side assembly on the left bracket. Then, fit the auxiliary positioning hole on the left side assembly into the positioning diamond pin 1.6 of the left side assembly. Finally, install and tighten the assembly bolts of the left side assembly. Then, fit the main positioning hole on the right side assembly into the positioning pin 1.5 of the middle assembly and side assembly on the right bracket. Then, fit the auxiliary positioning hole on the right side assembly into the positioning diamond pin 1.6 of the right side assembly. Finally, install and tighten the assembly bolts of the right side assembly.

[0076] S34. Assembly of intake grille 7: First, align the intake grille positioning hole 7.1 with the intake grille positioning threaded hole 1.7, then insert the bolt and tighten it;

[0077] S35. Assembly of the flip pedal 8: Fit the flip pedal positioning pin hole 8.1 into the corresponding flip pedal positioning diamond pin 1.8, adjust the position of the flip pedal 8, and then install and tighten the assembly bolts.

[0078] S36. Assembly of decorative panel 9: Align the main positioning cross pin and the secondary positioning cross pin of the left decorative panel with the main positioning hole 5.3 and the secondary positioning hole 5.4 of the left decorative panel respectively, and then push hard to make the buckle fasten. Then align the main positioning cross pin and the secondary positioning cross pin of the right decorative panel with the main positioning hole 5.3 and the secondary positioning hole 5.4 of the right decorative panel respectively, and then push hard to make the buckle fasten.

[0079] S4. Transportation: After assembly, the bumper is transported while suspended on the tooling. When it needs to be assembled into the vehicle, the bumper can be removed from the tooling.

[0080] Example 3:

[0081] In this embodiment

[0082] Bracket positioning structure: 1.1 hanging holes, one on each side of the bracket, with a diameter of 50mm;

[0083] Center crossbeam positioning: There are 2 round pins on each of the left and right brackets for center crossbeam positioning, totaling 4 pins with a diameter of 8mm.

[0084] Upper crossbeam positioning: There are 1.3mm diameter round pins for positioning the upper crossbeam, one on each of the left and right supports, for a total of two, with a diameter of 8mm.

[0085] Headlight positioning: There are 1.4mm diameter positioning pin holes on the headlight housing, 2 on each of the left and right brackets, for a total of 4, with 8mm diameter round pin holes.

[0086] Central assembly positioning: There are 1.5mm diameter round pins for positioning the central assembly and side assembly, one on each of the left and right brackets, for a total of two round pins with a diameter of 8mm.

[0087] Side assembly positioning: 1.5 round pins for positioning the middle assembly and the side assembly (shared with the middle assembly), 1 on each of the left and right brackets, a total of 2 round pins with a diameter of 8mm; 1.6 diamond pins for positioning the side assembly, 1 on each of the left and right brackets, a total of 2 diamond pins with a diameter of 5×8mm.

[0088] Air intake grille positioning: There are 1.7mm threaded holes for positioning the air intake grille, one on each of the left and right brackets, for a total of two, with a specification of M8.

[0089] Flip pedal positioning: Flip pedal positioning diamond pin 1.8, 1 on each of the left and right brackets, a total of 2, 5×8mm diamond pins.

[0090] The center crossbeam positioning structure consists of four 2.1mm diameter round pin holes, each 8mm in diameter.

[0091] Upper crossbeam positioning structure: There are 2 positioning pin holes 3.1 on the upper crossbeam, with a diameter of 8mm.

[0092] Headlight positioning structure: There are 4.1 cross pins for positioning the headlight housing, 2 on each of the left and right headlights, for a total of 4, with a diameter of 8mm.

[0093] Central assembly positioning structure: Central assembly main positioning hole 5.1, 8mm diameter hole.

[0094] The central assembly has a 5.2mm, 8×9mm oblong hole for positioning.

[0095] There are two main positioning holes for the decorative panel, each with a diameter of 8mm.

[0096] There are two secondary positioning holes for the decorative panel, each 8×9mm in diameter.

[0097] Side assembly positioning structure: Side assembly main positioning hole 6.1, 8mm diameter hole.

[0098] The side assembly has a 6.2mm positioning hole with a diameter of 8mm.

[0099] Air intake grille positioning structure: There are 2 air intake grille positioning holes with a diameter of 8.5mm.

[0100] Flip pedal positioning structure: There are 2 flip pedal positioning pin holes with a diameter of 8mm.

[0101] Decorative panel positioning structure: 9.1 main positioning cross pins for decorative panels, 1 on each side, totaling 2, with a diameter of 8mm; 9.2 secondary positioning cross pins for decorative panels, 1 on each side, totaling 2, with a diameter of 8mm.

[0102] Hang the left and right supports on the fixture. The fixture must have two hooks that match the hanging holes 1.1 for hanging. The two hooks on the fixture must be at the same horizontal height and the distance between them must be the same as the theoretical distance between the two holes 11 on the left and right supports. This ensures that the left and right supports are not easy to fall off when they are hung on the fixture and can swing around the hooks.

[0103] ① Positioning and assembly of skeleton components:

[0104] First, insert the center crossbeam positioning pin 1.2 through the corresponding center crossbeam positioning pin hole 2.1. During positioning, the bracket needs to be adjusted to allow the pin to pass through the hole. Then, insert the upper crossbeam positioning pin 1.3 through the corresponding upper crossbeam positioning pin hole 3.1. Finally, use ordinary bolts to tighten the positioned center crossbeam 2 and upper crossbeam 3 onto the bracket. The diameter tolerance of the positioning pin is (-0.1, 0) mm, and the diameter tolerance of the positioning hole is (0, +0.1) mm. When assembling the center crossbeam 2 and upper crossbeam 3 onto bracket 1, a total of 6 pins and 6 holes are used for positioning to ensure reliable positioning. This effectively reduces frame deformation, and the pin-hole positioning method provides reliable strength. The method of positioning with pin holes first and then tightening bolts ensures good assemblability.

[0105] The positional accuracy of the functional holes, pins, and threaded holes on the assembled skeleton can be guaranteed to be 0.5mm.

[0106] ② Positioning and assembly of exterior components:

[0107] Headlight assembly: Pass the headlight housing positioning cross pin 4.1 through the corresponding headlight housing positioning pin hole 1.4. Since all positioning is done using cross pins and round holes, there may be slight interference during the positioning process. Apply slight force to pass the pin through. Then tighten the headlight assembly bolts. The diameter tolerance of the positioning pin is (-0.1, +0.1) mm, and the diameter tolerance of the positioning round hole is (0, +0.1) mm. This cross pin and round hole positioning method, due to over-positioning, will result in slight interference. At this time, the cross pin will undergo slight deformation, and the pin hole will have an interference fit, resulting in better and more reliable positioning accuracy.

[0108] Middle Assembly Assembly: First, fit the main locating hole 5.1 of the middle assembly into the locating pins 1.5 of the middle and side assemblies on the left bracket. Then, fit the secondary locating hole 5.2 of the middle assembly into the locating pins 1.5 of the middle and side assemblies on the right bracket. Finally, install and tighten the assembly bolts of the middle assembly 5. The diameter tolerance of the locating pins is (-0.1, 0) mm, and the diameter tolerance of the locating holes is (0, +0.1) mm. The locating direction tolerance of the oblong holes is (0, +0.1) mm. The use of oblong holes in the middle assembly positioning avoids positioning interference. Since the middle assembly is a thin-plate stamped part, this design not only facilitates assembly but also avoids component deformation and loss of precision caused by positioning interference.

[0109] Side assembly assembly: First, fit the main positioning hole 6.1 on the left side assembly into the center assembly and side assembly positioning pin 1.5 on the left bracket. Then, fit the secondary positioning hole 6.2 on the left side assembly into the left side assembly positioning diamond pin 1.6. Finally, install and tighten the left side assembly assembly bolts. Next, fit the main positioning hole 6.1 on the right side assembly into the center assembly and side assembly positioning pin 1.5 on the right bracket. Then, fit the secondary positioning hole 6.2 on the right side assembly into the right side assembly positioning diamond pin 1.6. Finally, install and tighten the right side assembly assembly bolts. The diameter tolerance of the circular positioning pin is (-0.1, 0) mm, the positioning direction tolerance of the diamond positioning pin is (-0.1, 0) mm, and the diameter tolerance of the positioning hole is (0, +0.1) mm. The side assembly shares two locating pins with the central assembly, which improves accuracy and reduces costs. The use of diamond-shaped pins avoids positioning interference. The side assembly is a thin sheet stamping part. This design not only facilitates assembly but also avoids component deformation and loss of accuracy caused by positioning interference.

[0110] Air intake grille assembly: First, align the air intake grille positioning hole 7.1 with the air intake grille positioning threaded hole 1.7, then insert the bolt and tighten it. The gap between the air intake grille 7 and the surrounding parts is avoided by design and is not noticeable in appearance, so M8 bolts are used with 8.5mm diameter holes for positioning and assembly. This method balances the relationship between appearance quality and cost.

[0111] Flip pedal assembly: Fit the flip pedal positioning pin hole 8.1 into the corresponding flip pedal positioning diamond pin 1.8, adjust the position of the flip pedal 8, and then install and tighten the assembly bolts. The positioning direction tolerance of the diamond positioning pin is (-0.1, 0) mm, and the diameter tolerance of the positioning round hole is (0, +0.1) mm. The flip pedal is an opening and closing component, and it is positioned using two diamond pins and two round holes. This incomplete positioning method leaves a certain adjustment space for the flip pedal, ensuring positioning accuracy while facilitating fine-tuning according to the position of the mechanism during flip pedal assembly.

[0112] Decorative panel assembly: The main and auxiliary locating cross pins of the left decorative panel are aligned with the main locating hole 5.3 and auxiliary locating hole 5.4 of the left decorative panel, respectively. Then, push firmly to lock the snap fasteners. Similarly, align the main and auxiliary locating cross pins of the right decorative panel with the main locating hole 5.3 and auxiliary locating hole 5.4 of the right decorative panel, and push firmly to lock the snap fasteners. The diameter tolerance of the locating pins is (-0.1, +0.1) mm, the diameter tolerance of the locating round holes is (0, +0.1) mm, and the tolerance of the locating oblong holes in the locating direction is (0, +0.1) mm. The main locating of the decorative panel uses a cross pin with a round hole, and the auxiliary locating uses a cross pin with an oblong hole. This snap fastener assembly method provides reliable accuracy and facilitates single-sided assembly.

[0113] ③ After assembly, the bumper is transported while suspended on the tooling. When it needs to be assembled into the vehicle, the bumper can be removed from the tooling.

[0114] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A truck bumper positioning structure, comprising a bracket (1), a middle crossbeam (2), an upper crossbeam (3), a headlight housing (4), a central assembly (5), a side assembly (6), an air intake grille (7), a flip-up pedal (8), and a decorative panel (9), characterized in that, The bracket (1), middle crossbeam (2), upper crossbeam (3), headlight housing (4), middle assembly (5), side assembly (6), air intake grille (7), flip pedal (8) and decorative panel (9) are all provided with differentiated positioning structures. The middle crossbeam (2), upper crossbeam (3), headlight housing (4), middle assembly (5), side assembly (6), air intake grille (7) and flip pedal (8) are all positioned and assembled onto the bracket (1) through the corresponding positioning structures. The decorative panel (9) is positioned and assembled onto the middle assembly (5) through the corresponding positioning structures.

2. The truck bumper positioning structure according to claim 1, characterized in that, The bracket (1) includes a left bracket and a right bracket. The positioning structure of the bracket (1) includes two suspension holes (1.1), four middle crossbeam positioning pins (1.2), two upper crossbeam positioning pins (1.3), four headlight housing positioning pin holes (1.4), two middle assembly and side assembly positioning pins (1.5), two side assembly positioning diamond pins (1.6), two air intake grille positioning threaded holes (1.7), and two flip pedal positioning diamond pins (1.8), and two suspension holes (1.1). Symmetrically positioned on the corresponding positions of the left and right brackets near the frame, used for installation positioning during bumper hoisting and transportation; four middle crossbeam positioning pins (1.2) are symmetrically positioned in pairs on the corresponding positions of the left and right brackets near the frame, used to cooperate with the positioning structure of the middle crossbeam (2) for positioning; two upper crossbeam positioning pins (1.3) are respectively positioned on the corresponding positions of the left and right brackets near the frame, used to cooperate with the positioning structure of the upper crossbeam (3) for positioning; four headlight housing positioning pin holes (1.4) Two sets are symmetrically arranged on the middle and outer edges of the left and right brackets respectively, for positioning in conjunction with the positioning structure of the headlight housing (4); two middle assembly and side assembly positioning pins (1.5) are symmetrically arranged on the bottom edges of the left and right brackets respectively, for positioning the middle assembly (5) and the side assembly (6) in sequence with the positioning structure of the middle assembly and the positioning structure of the side assembly (6); two side assembly positioning diamond pins (1. 6) Symmetrically arranged on the corresponding positions of the left and right brackets near the frame, used to cooperate with the positioning structure of the side assembly (6) for auxiliary positioning; two air intake grille positioning threaded holes (1.7) are symmetrically arranged on the corresponding positions of the left and right brackets near the frame, used to cooperate with the positioning structure of the air intake grille (7) for positioning; two flip pedal positioning diamond pins (1.8) are symmetrically arranged on the corresponding positions of the left and right brackets near the frame, used to cooperate with the positioning structure of the flip pedal (8) for positioning.

3. The truck bumper positioning structure according to claim 2, characterized in that, The positioning structure of the middle crossbeam (2) includes four middle crossbeam positioning pin holes (2.1). The four middle crossbeam positioning pin holes (2.1) are set in pairs at the corresponding positions at the left and right ends of the middle crossbeam (2). The four middle crossbeam positioning pins (1.2) are matched and inserted into the four middle crossbeam positioning pin holes (2.1). The positioning structure of the upper crossbeam (3) includes two upper crossbeam positioning pin holes (3.1). The two upper crossbeam positioning pin holes (3.1) are set at the corresponding positions at the left and right ends of the upper crossbeam (3). The two upper crossbeam positioning pins (1.3) are matched and inserted into the two upper crossbeam positioning pin holes (3.1).

4. The truck bumper positioning structure according to claim 2, characterized in that, The headlight housing (4) includes a left headlight housing and a right headlight housing. The positioning structure of the headlight housing (4) includes four headlight housing positioning cross pins (4.1). The four headlight housing positioning cross pins (4.1) are symmetrically arranged in pairs at corresponding positions on the left headlight housing and the right headlight housing. The four headlight housing positioning cross pins (4.1) are matched and inserted into the four headlight housing positioning pin holes (1.4).

5. The truck bumper positioning structure according to claim 2, characterized in that, The positioning structure of the central assembly (5) includes a central assembly main positioning hole (5.1), a central assembly secondary positioning hole (5.2), two decorative panel main positioning holes (5.3) and two decorative panel secondary positioning holes (5.4). The central assembly main positioning hole (5.1) is a round pin hole, and the central assembly secondary positioning hole (5.2) is an oblong hole. The central assembly main positioning hole (5.1) is located on the left side of the central assembly (5) and matches the position of the central assembly and side assembly positioning pins (1.5) on the left bracket. The central assembly secondary positioning hole (5.2) is located on the central assembly (5). The right end of the middle assembly and the side assembly positioning pin (1.5) on the right bracket are matched and positioned in the middle assembly main positioning hole (5.1) on the left bracket. The middle assembly and the side assembly positioning pin (1.5) on the right bracket are matched and positioned in the middle assembly secondary positioning hole (5.2). The two main positioning holes (5.3) and the two secondary positioning holes (5.4) of the decorative panel are respectively set at the corresponding positions of the middle assembly (5) for positioning in cooperation with the positioning structure of the decorative panel (9).

6. The truck bumper positioning structure according to claim 2, characterized in that, The side assembly (6) includes a left side assembly and a right side assembly. The positioning structure of the side assembly (6) includes two main positioning holes (6.1) and two auxiliary positioning holes (6.2). The two main positioning holes (6.1) are symmetrically arranged below the left side assembly and the right side assembly and correspond to the positions of the two middle assemblies and the side assembly positioning pins (1.5). The two auxiliary positioning holes (6.2) are symmetrically arranged above the left side assembly and the right side assembly and correspond to the positions of the two side assembly positioning diamond pins (1.6). The two middle assemblies and the side assembly positioning pins (1.5) are respectively matched and inserted into the two main positioning holes (6.1) of the side assembly, and the two side assembly positioning diamond pins (1.6) are respectively matched and inserted into the two auxiliary positioning holes (6.2) of the side assembly.

7. The truck bumper positioning structure according to claim 2, characterized in that, The positioning structure of the air intake grille (7) includes two air intake grille positioning holes (7.1). The two air intake grille positioning holes (7.1) are respectively set on the left and right ends of the air intake grille. The diameter of the air intake grille positioning hole (7.1) is 0.5mm larger than the diameter of the air intake grille positioning threaded hole (1.7). The two air intake grille positioning holes (7.1) and the two air intake grille positioning threaded holes (1.7) are matched and aligned. The air intake grille is positioned by bolts that match the air intake grille positioning threaded hole (1.7) passing through the air intake grille positioning hole (7.1) and the aligned air intake grille positioning threaded hole (1.7) in sequence and screwing them into the corresponding bracket.

8. The truck bumper positioning structure according to claim 2, characterized in that, The positioning structure of the flip pedal (8) includes two flip pedal positioning pin holes (8.1). The two flip pedal positioning pin holes (8.1) are respectively set at the corresponding positions at the left and right ends of the flip pedal (8). The two flip pedal positioning diamond pins (1.8) are respectively matched and inserted into the two flip pedal positioning pin holes (8.1).

9. The truck bumper positioning structure according to claim 2, characterized in that, The decorative panel (9) includes a left decorative panel and a right decorative panel. The positioning structure of the decorative panel (9) includes two main positioning cross pins (9.1) and two secondary positioning cross pins (9.2). The two main positioning cross pins (9.1) and the two secondary positioning cross pins (9.2) are respectively set on the left decorative panel and the right decorative panel. The positions of the two main positioning cross pins (9.1) and the two main positioning holes (5.3) of the decorative panel are corresponding. The positions of the two secondary positioning cross pins (9.2) and the two secondary positioning holes (5.4) of the decorative panel are corresponding. The two main positioning cross pins (9.1) are respectively matched and inserted into the two main positioning holes (5.3) of the decorative panel, and the two secondary positioning cross pins (9.2) are matched and inserted into the two secondary positioning holes (5.4) of the decorative panel.

10. A method for assembling a truck bumper, characterized in that, The truck bumper positioning structure as described in any one of claims 1-9 is used, and the bumper is assembled in the actual vehicle posture, the steps of which include: S1, Suspension bracket: The left and right brackets are suspended on the fixture. The fixture is equipped with two hooks that match the position of the suspension hole (1.1). The two hooks are at the same horizontal height and are theoretically the same distance from the suspension hole (1.1) on the left and right brackets. S2. Positioning and assembly of the bracket: First, pass the middle crossbeam positioning pin (1.2) through the corresponding middle crossbeam positioning pin hole (2.1), then pass the upper crossbeam positioning pin (1.3) through the corresponding upper crossbeam positioning pin hole (3.1), and finally use bolts to tighten and assemble the middle crossbeam (2) and upper crossbeam (3) that have been positioned onto the bracket. S3. Positioning and assembly of exterior components, including: S31. Assembly of headlight housing (4): Pass the headlight housing positioning cross pin (4.1) through the corresponding headlight housing positioning pin hole (1.4), and then tighten the headlight assembly bolts. S32. Assembly of the middle assembly (5): First, fit the main positioning hole (5.1) of the middle assembly into the positioning pin (1.5) of the middle assembly and the side assembly on the left bracket. Then, fit the auxiliary positioning hole (5.2) of the middle assembly into the positioning pin (1.5) of the middle assembly and the side assembly on the right bracket. Then, install and tighten the assembly bolts of the middle assembly (5). S33. Assembly of the side assembly (6): First, fit the main positioning hole 6.1 of the side assembly on the left side assembly into the positioning pin (1.5) of the middle assembly and side assembly on the left bracket. Then, fit the auxiliary positioning hole 6.2 of the side assembly on the left side assembly into the positioning diamond pin (1.6) of the left side assembly. Finally, install and tighten the assembly bolts of the left side assembly. Then, fit the main positioning hole 6.1 of the side assembly on the right side assembly into the positioning pin (1.5) of the middle assembly and side assembly on the right bracket. Then, fit the auxiliary positioning hole 6.2 of the side assembly on the right side assembly into the positioning diamond pin (1.6) of the right side assembly. Finally, install and tighten the assembly bolts of the right side assembly. S34. Assembly of the air intake grille (7): First, align the air intake grille positioning hole (7.1) with the air intake grille positioning threaded hole (1.7), then insert the bolt and tighten it; S35. Assembly of the flip pedal (8): Insert the flip pedal positioning pin hole (8.1) into the corresponding flip pedal positioning diamond pin (1.8), adjust the position of the flip pedal (8), and then install and tighten the assembly bolts. S36. Assembly of decorative panel (9): The main positioning cross pin and the auxiliary positioning cross pin of the left decorative panel are respectively matched and aligned with the main positioning hole (5.3) and the auxiliary positioning hole (5.4) of the left decorative panel, and then pushed hard to make the buckle fastened. Then the main positioning cross pin and the auxiliary positioning cross pin of the right decorative panel are respectively aligned with the main positioning hole (5.3) and the auxiliary positioning hole (5.4) of the right decorative panel, and then pushed hard to make the buckle fastened. S4. Transportation: After assembly, the bumper is transported while suspended on the tooling. When it needs to be assembled into the vehicle, the bumper can be removed from the tooling.

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