Method for positioning exterior trim components of the tractor cab and the front of the tractor cab

Abstract

This application relates to a method for positioning exterior trim components for the front of a tractor cab and a tractor cab front panel, comprising the following steps: mating one side of the outer side panel assembly with the door assembly to complete the initial X-axis and Y-axis installation positioning of the outer side panel assembly; mating the other side of the outer side panel assembly with the front side longitudinal beam to complete the secondary X-axis and Z-axis installation positioning of the outer side panel assembly; using the mating position between the outer side panel assembly and the front side longitudinal beam on the front side longitudinal beam as the outer side panel positioning area, and using the contact position between the front cover assembly and the front side longitudinal beam on the front side longitudinal beam as the front cover positioning area, so that the outer side panel positioning area and the front cover positioning area are on the same plane, which is generated by the same stamping process; using the left and right outer side panel assemblies as positioning references, completing the Y-axis installation positioning of the front cover assembly; mating the front cover assembly with the front cover positioning area to complete the X-axis and Z-axis installation positioning of the front cover assembly. This invention optimizes the surface difference results of the vehicle assembly gap.

Description

Technical Field

[0001] This application relates to the field of automotive exterior design, and in particular to a method for positioning exterior parts of the front face of a tractor cab and the front face of the tractor cab. Background Technology

[0002] The existing exterior trim components of the tractor cab mainly include parts such as the front grille, wiper covers, and outer side panels. Traditional positioning solutions mostly rely on the connection points between the parts and the body-in-white to achieve self-positioning. The positioning accuracy of this design basically depends on the dimensional accuracy of the exterior trim parts themselves and the accuracy and manufacturing accuracy of the parts in the corresponding areas of the body. Since the positioning points of different parts are scattered on different body structural components, there are many dimensional links in the aesthetic function guarantee between exterior trim parts and between exterior trim parts and surrounding environmental parts. The tolerance of the links is large, and the actual matching effect is often unsatisfactory. Various gaps and surface differences are numerous, which cannot meet the needs of continuous improvement in the aesthetic characteristics and perceived quality of the whole vehicle. Summary of the Invention

[0003] This application provides a method for positioning the exterior trim of the front face of a tractor cab and a front face of the tractor cab, in order to solve the problems of unsatisfactory matching effect of different parts on the vehicle and numerous gap and surface defects in related technologies.

[0004] To achieve the above objectives, the present invention provides the following technical solution: Firstly, a method for positioning the exterior trim of the front face of a tractor cab is provided, comprising the steps of: aligning one side of the outer panel assembly with the door assembly to complete the initial X-axis and Y-axis installation positioning of the outer panel assembly; aligning the other side of the outer panel assembly with the front side longitudinal beam to complete the secondary X-axis and Z-axis installation positioning of the outer panel assembly; using the alignment position of the outer panel assembly on the front side longitudinal beam with the front side longitudinal beam as the outer panel positioning area, and the contact position of the front cover assembly on the front side longitudinal beam with the front side longitudinal beam as the front cover positioning area, so that the outer panel positioning area and the front cover positioning area are located on the same plane, which is generated by the same stamping process; using the left and right outer panel assemblies as positioning references, completing the Y-axis installation positioning of the front cover assembly; aligning the front cover assembly with the front cover positioning area to complete the X-axis and Z-axis installation positioning of the front cover assembly.

[0005] In some embodiments, the left and right outer side panel assemblies are used as positioning references to complete the Y-axis installation and positioning of the front cover assembly, and the front cover assembly is aligned with the front cover positioning area. After completing the X-axis and Z-axis installation and positioning of the front cover assembly, the method further includes: installing the positioning wiper cover assembly on the front upper crossbeam and the front side longitudinal beam.

[0006] In some embodiments, the front cover assembly includes a front cover body, two front cover hinges, and two front cover bolts, with the two front cover hinges and two front cover bolts mounted on the front cover body; the front cover positioning area includes a front cover hinge positioning area and a front cover bolt positioning area, with a front cover lock body mounted in the front cover bolt positioning area.

[0007] The front cover assembly is aligned with the front cover positioning area. The specific steps include: aligning the front cover hinge with the front cover hinge positioning area; and aligning the front cover bolt with the front cover lock body installed on the front cover bolt positioning area.

[0008] In some embodiments, before aligning the front cover hinge with the front cover hinge positioning area, the step further includes: using a sub-assembly fixture to install the front cover hinge onto the upper part of the front cover body, and ensuring that at least one bolt fastening area is located above the front cover body in the area where the front cover hinge aligns with the front cover hinge positioning area, so that at least one bolt of the fastening bolt of the single-sided front cover hinge on the vehicle body can be tightened when the front cover body is closed.

[0009] In some embodiments, there are two outer side panel assemblies, and the front cover assembly is located between the two outer side panel assemblies;

[0010] Using the left and right outer side panel assemblies as positioning references, after completing the Y-axis installation and positioning of the front cover assembly, before aligning the front cover assembly with the front cover positioning area, the method further includes: checking whether the gap between the front cover assembly and the left and right outer side panel assemblies is consistent; if not, adjusting the position of the front cover assembly until the gap between the two sides of the front cover assembly and the left and right outer side panel assemblies is consistent.

[0011] Secondly, a tractor cab front panel is provided, comprising: assembled using the tractor cab front panel exterior trim positioning method described above.

[0012] In some embodiments, the door assembly includes an upper hinge assembly and a lower hinge assembly, both of which include a hinge shaft. One end of the hinge shaft on the upper hinge assembly extends along a first direction to form an upper hinge extension shaft positioning member for connection with the outer side panel assembly. One end of the hinge shaft on the lower hinge assembly extends along the first direction to form a lower hinge extension shaft positioning member for connection with the outer side panel assembly.

[0013] In some embodiments, the outer side panel assembly includes:

[0014] Outer side plate body;

[0015] The mating component is fixed to the outer side panel body on the side near the door assembly, and the mating component is connected to the upper hinge extension shaft positioning component and the lower hinge extension shaft positioning component.

[0016] The bracket is fixed to the other side of the outer panel body near the front cover assembly, and the bracket is connected to the positioning area of ​​the outer panel.

[0017] In some embodiments, the front cover assembly includes a front cover body, two front cover hinges and two front cover bolts, wherein the two front cover hinges and the two front cover bolts are mounted on the front cover body;

[0018] The front cover positioning area includes a front cover hinge positioning area and a front cover bolt positioning area. The front cover bolt positioning area is equipped with a front cover lock body. The front cover hinge is connected to the front cover hinge positioning area, and the front cover bolt is connected to the front cover lock body installed on the front cover bolt positioning area.

[0019] In some embodiments, the front cover hinge is disposed on the upper part of the front cover body, and at least one bolt fastening area is located above the front cover body in the area where the front cover hinge and the front cover hinge positioning area are connected.

[0020] The beneficial effects of the technical solution provided in this application include:

[0021] This application provides a method for positioning exterior trim parts for the front of a tractor cab and a tractor cab front. Different exterior trim parts are positioned on the same vehicle body structure, i.e., an outer panel positioning area and a front cover positioning area are provided on the front side longitudinal beam, so that the outer panel assembly and the front cover assembly are positioned on the front side longitudinal beam. After the outer panel assembly is installed, the outer panel positioning area on the front side longitudinal beam is determined. Based on the position of the outer panel positioning area, the position of the front cover positioning area on the front side longitudinal beam is determined. By arranging the outer panel positioning area and the front cover positioning area adjacent to each other on the front side longitudinal beam, the dimensional chain of the gap surface difference between the outer panel assembly and the front cover assembly is reduced, and the vehicle assembly gap surface difference result is optimized. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the door assembly structure provided in the embodiments of this application (before the door assembly is assembled with the upper hinge assembly and the lower hinge assembly);

[0024] Figure 2 A schematic diagram of the door assembly structure provided in the embodiments of this application (after the door assembly is assembled with the upper hinge assembly and the lower hinge assembly);

[0025] Figure 3 A schematic diagram of the mating parts and the lower hinge extension shaft positioning parts provided in the embodiments of this application;

[0026] Figure 4 A schematic diagram of the outer side panel assembly structure (X-direction) provided for an embodiment of this application;

[0027] Figure 5 A schematic diagram of the outer side panel assembly structure (X+ direction) provided for an embodiment of this application;

[0028] Figure 6 This is a schematic diagram of the vehicle body and driver's cab provided in an embodiment of this application;

[0029] Figure 7 for Figure 6 Enlarged view of a portion of point A in the middle;

[0030] Figure 8 A schematic diagram of the front cover assembly structure (before disassembly) provided for an embodiment of this application;

[0031] Figure 9 A schematic diagram of the front cover assembly structure (after disassembly) provided for an embodiment of this application;

[0032] Figure 10 This is a schematic diagram of the front cover hinge structure provided in an embodiment of this application;

[0033] Figure 11 This is a schematic diagram of the wiper cover assembly structure provided in an embodiment of this application;

[0034] Figure 12 A flowchart illustrating the method for positioning the exterior trim of the front face of a tractor cab provided in this embodiment of the application.

[0035] In the diagram: 1. Door assembly; 10. Upper hinge assembly; 100. Upper hinge extension shaft positioning component; 11. Lower hinge assembly; 110. Lower hinge extension shaft positioning component; 12. Door assembly;

[0036] 2. Outer panel assembly; 20. Mating part; 21. Bracket; 210. Positioning hole; 22. Outer panel body;

[0037] 3. Front side longitudinal beams; 30. Outer side panel positioning area; 31. Front hood positioning area; 310. Front hood hinge positioning area; 311. Front hood bolt positioning area;

[0038] 4. Front cover assembly; 40. Front cover body; 41. Front cover hinge; 410. Front cover hinge positioning pin; 411. Front cover outline;

[0039] 5. Front upper crossbeam;

[0040] 6. Wiper cover assembly; 60. Clip; 61. Wiper cover positioning pin; 62. Wiper cover body. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] See Figures 1 to 12 This application provides a method for positioning the exterior trim of the front face of a tractor cab and a front face of the tractor cab, which can solve the problems of unsatisfactory matching effect of different parts on the vehicle and many gaps and surface defects in related technologies.

[0043] In a first aspect, embodiments of this application provide a method for positioning the exterior trim of the front fascia of a tractor cab, comprising the following steps:

[0044] 110: Align one side of the outer side panel assembly 2 with the door assembly 1 to complete the initial installation and positioning of the outer side panel assembly 2 in the X and Y directions;

[0045] 102: Connect the other side of the outer side panel assembly 2 to the front side longitudinal beam 3 to complete the secondary installation positioning in the X direction and the installation positioning in the Z direction of the outer side panel assembly 2;

[0046] 103: The position where the outer side panel assembly 2 on the front side longitudinal beam 3 meets the front side longitudinal beam 3 is designated as the outer side panel positioning area 30, and the position where the front cover assembly 4 on the front side longitudinal beam 3 meets the front side longitudinal beam 3 is designated as the front cover positioning area 31, so that the outer side panel positioning area 30 and the front cover positioning area 31 are located on the same plane, and this plane is generated by the same stamping process.

[0047] 104: Using the left and right outer side panel assemblies 2 as the positioning reference, complete the Y-direction installation positioning of the front cover assembly 4, and align the front cover assembly 4 with the front cover positioning area 31 to complete the X-direction and Z-direction installation positioning of the front cover assembly 4.

[0048] The existing tractor cab front exterior trim mainly includes parts such as the front cover assembly 4, wiper cover assembly 6, and outer side panel assembly 2. Traditional positioning schemes mostly rely on the connection points between the parts and the body-in-white to achieve self-positioning of the parts. The positioning accuracy of this positioning design basically depends on the dimensional accuracy of the exterior parts themselves and the accuracy and manufacturing accuracy of the parts in the corresponding areas of the body. Since the positioning points of different parts are scattered on different body structural components, there are many dimensional links in the aesthetic function guarantee between exterior parts and between exterior parts and surrounding environmental parts. The tolerance of the links is large, and the actual matching effect is often unsatisfactory. There are many gaps and surface differences, which cannot meet the needs of continuous improvement of the overall vehicle aesthetic characteristics and perceived quality.

[0049] Therefore, in order to solve the above problems, this application first aligns one side of the outer panel assembly 2 with the door assembly 1 to complete the initial installation and positioning of the outer panel assembly 2 in the X and Y directions; then, it aligns the other side of the outer panel assembly 2 with the front side longitudinal beam 3 to complete the secondary installation and positioning of the outer panel assembly 2 in the X and Z directions; then, the position where the outer panel assembly 2 on the front side longitudinal beam 3 aligns with the front side longitudinal beam 3 is designated as the outer panel positioning area 30, and the position where the front cover assembly 4 on the front side longitudinal beam 3 fits with the front side longitudinal beam 3 is designated as the front cover positioning area 31, so that the outer panel positioning area 30 and the front cover positioning area 31 are located on the same plane, which is generated by the same stamping process; finally, using the left and right outer panel assemblies 2 as the positioning reference, the front cover assembly 4 is installed and positioned in the Y direction, and the front cover assembly 4 is aligned with the front cover positioning area 31 to complete the installation and positioning of the front cover assembly 4 in the X and Z directions. Therefore, in this application, the different exterior trim positioning points of the tractor cab front are set on the same body structure, that is, the front side longitudinal beam 3 is provided with an outer panel positioning area 30 and a front cover positioning area 31, so that the outer panel assembly 2 and the front cover assembly 4 are positioned on the front side longitudinal beam 3 in the X and Z directions; after the outer panel assembly 2 is installed, the outer panel positioning area 30 and the front cover positioning area 31 are located on the same plane, which is generated by the same stamping process. This arrangement reduces the dimensional difference links between the outer panel assembly 2 and the front cover assembly 4.

[0050] It should be noted that the door assembly 1 includes an upper hinge assembly 10, a lower hinge assembly 11, and a door assembly 12. The upper hinge assembly 10 and the lower hinge assembly 11 are connected to the door assembly 12. During the assembly of the door assembly 1, the door assembly 12 is first assembled with the upper hinge assembly 10 and the lower hinge assembly 11 on an offline tooling to form the door assembly 1. Then, the door assembly 1 is transferred to the adjustment line, and the assembly template is used to assemble the door assembly 1 onto the body of the white car.

[0051] Due to styling requirements and cost reduction needs, some tractor models incorporate an outer side panel assembly 2 between the front hood assembly 4 and the left and right door assemblies 1. The outer side panel assembly 2 functions similarly to a fender in a passenger car. Specifically, the outer side panel assembly 2 includes: an outer side panel body 22, a mating component 20, and a bracket 21. The mating component 20 is fixed to the outer side panel body 22 on the side near the door assembly 1 and is connected to the upper hinge extension shaft positioning component 100 and the lower hinge extension shaft positioning component 110. The bracket 21 is fixed to the other side of the outer side panel body 22 near the front hood assembly 4 and is connected to the outer side panel positioning area 30. The outer side panel body 22 is generally made of engineering plastic. During assembly, the outer side panel assembly 2 is directly connected to the mating part 20 and the upper hinge extension shaft positioning part 100 and the lower hinge extension shaft positioning part 110. The upper hinge extension shaft positioning part 100 and the lower hinge extension shaft positioning part 110 are used to position the outer side panel body 22 in the X and Y directions. Then, the bracket 21 is connected to the front side longitudinal beam 3 to position the outer side panel body 22 in the Z direction. Here, the X direction refers to the length direction of the cab (X+ towards the rear of the vehicle body), and the Y direction refers to the width direction of the cab (Y+ towards the driver's side).

[0052] Furthermore, the upper hinge assembly 10 and the lower hinge assembly 11 include hinge shafts, one end of which extends along a first direction to form an upper hinge extension shaft positioning member 100 and a lower hinge extension shaft positioning member 110 for connection with the outer panel assembly 2; or, an extension rod is fixed at one end of the hinge shaft, the length direction of the extension rod being the first direction; wherein, the first direction refers to the Z direction (Z+ towards the top of the vehicle body), which also refers to the cab height direction. Therefore, the mating part 20 is provided with a slot opened along the first direction. When the outer panel assembly 2 is assembled, the mating part 20 is directly snapped onto the hinge shaft or the extension rod, and the hinge shaft is used to position the X and Y directions of the outer panel body 22. In this way, while ensuring good assembly of the outer panel body 22, the minimum dimensional link of the gap and surface difference between the outer panel body 22 and the door assembly 11 can be directly ensured.

[0053] A bracket 21 is installed on the side of the outer panel body 22 near the front side longitudinal beam 3. Multiple brackets 21 can be installed on the outer panel body 22 along the Z-direction. When the outer panel body 22 is connected to the front side longitudinal beam 3, the brackets 21 are aligned with the front side longitudinal beam 3 in the X-direction. Since the X and Y directions of the outer panel body 22 are positioned via hinge axes, the installation position of the bracket 21 on the outer panel body 22 can be determined based on the position of the outer panel positioning area 30 on the front side longitudinal beam 3.

[0054] The number of brackets 21 is the same as the number of outer panel positioning areas 30. For example, when there are three brackets 21, there must also be three outer panel positioning areas 30. Positioning holes 210 can be made on the brackets 21. The positioning holes 210 can be oblong holes (the minor diameter of the oblong hole is in the Z direction). A projection-welded nut is set at the outer panel positioning area 30 on the front side longitudinal beam 3. The bolt diameter is 0.5mm smaller than the minor diameter of the oblong hole. The bolt passes through the oblong hole on the bracket 21 and is tightened with the projection-welded nut to achieve the Z-direction positioning of the outer panel body 22.

[0055] Using the door assembly 1 as the X-axis and Y-axis reference for positioning, assemble the outer side panel assembly 2, and then using the outer side panel assembly 2 as the Y-axis reference for positioning, assemble the front cover assembly 4.

[0056] Preferably, in the embodiments of this application, the front cover assembly 4 includes a front cover body 40, two front cover hinges 41 and two front cover bolts, the two front cover hinges 41 and the two front cover bolts are mounted on the front cover body 40; the front cover positioning area 31 includes a front cover hinge positioning area 310 and a front cover bolt positioning area 311, the front cover bolt positioning area 311 is equipped with a front cover lock body;

[0057] The specific steps of “104: Aligning the front cover assembly 4 with the front cover positioning area 31” include:

[0058] 201: Connect the front cover hinge 41 to the front cover hinge positioning area 310;

[0059] 202: Connect the front cover bolt to the front cover lock body installed on the front cover bolt positioning area 311.

[0060] Specifically, the positioning and fastening scheme of the front cover assembly 4 is based on the premise that the front cover hinges 41 are arranged on both sides of the upper part of the front cover body 40. The front cover body 40 is assembled into an assembly offline with the front cover hinges 41 and the front cover bolts using tooling. The front cover bolts are arranged on both sides of the lower part of the front cover body 40. The maximum projection surface of the front cover assembly 4 is in the X direction, and there are 4 positioning points in the X direction: the contact surface between the front cover hinges 41 on the upper part of the front cover body 40 and the front side longitudinal beam 3 (one symmetrical on each side), and the contact surface between the front cover bolts on the lower part of the front cover body 40 and the front side longitudinal beam 3 (that is, the engagement point between the bolt and the lock body, one symmetrical on each side).

[0061] This step allows for the positioning and fastening of the front cover assembly 4 in the X direction. To further improve the stability of the front cover assembly 4 during installation, it is also necessary to position and fasten the front cover assembly 4 in the Z direction before fastening the X direction.

[0062] Specifically, a front cover hinge positioning pin 410 is designed on the front cover hinge 41, which cooperates with the elongated oval hole on the front side longitudinal beam 3. For example, a φ10 front cover hinge positioning pin 410 can be set, which cooperates with the elongated oval hole with a size of 10*16mm (short axis Z direction) on the front side longitudinal beam 3 to determine the Z direction of the front cover assembly 4. In order to ensure that when the front cover assembly 4 is installed on the white body, the bolts on both sides can be tightened in the closed state, before the front cover hinge 41 is connected to the front cover hinge positioning area 310, the steps also include: using an offline assembly fixture to install the front cover hinge 41 on the upper part of the front cover body 40, and ensuring that at least one bolt tightening area is located above the front cover body 40 in the area where the front cover hinge 41 is connected to the front cover hinge positioning area 310, so that the bolts of the front cover hinge 41 on the body can be tightened at least once when the front cover body 40 is closed. Figure 10 As shown, a front cover outline 411 can be provided on the front cover hinge 41. When the front cover hinge 41 is connected to the front cover body 40, the front cover outline 411 is used as a reference to ensure that the top of the front cover body 40 fits against the front cover outline 411. This ensures that the front cover assembly 4 can tighten the fastening bolts on the front cover hinge 41 on both sides when the front cover is closed. The remaining fastening bolts at the front cover latch can be tightened after the front cover body 40 is opened.

[0063] Preferably, in the embodiments of this application, there are two outer side panel assemblies 2, and the front cover assembly 4 is located between the two outer side panel assemblies 2;

[0064] The method described above, "using the left and right outer side panel assemblies 2 as positioning references, after completing the Y-axis installation and positioning of the front cover assembly 4, and before aligning the front cover assembly 4 with the front cover positioning area 31," further includes:

[0065] 301: Check whether the gap between the front cover assembly 4 and the outer side panel assemblies 2 on the left and right sides is consistent;

[0066] 302: If inconsistent, adjust the position of the front cover assembly 4 until the gap between the two sides of the front cover assembly 4 and the outer side panel assemblies 2 on the left and right sides is consistent.

[0067] Specifically, an automatic centering fixture is used to complete the Y-axis installation and positioning of the front cover assembly 4, using the outer side panel assemblies 2 on both sides as a reference to ensure the consistency of the gap between the front cover assembly 4 and the left and right outer side panel assemblies 2. The gap between the front cover assembly 4 and the left and right outer side panel assemblies 2 is the same as the gap between the front cover body 40 and the left and right outer side panel assemblies 2.

[0068] When the gap between the front cover assembly 4 and the left and right outer side plate assemblies 2 is inconsistent, the automatic centering fixture is operated again to ensure that the gap between the front cover assembly 4 and the left and right outer side plate assemblies 2 is consistent.

[0069] Preferably, in the embodiments of this application, after using the left and right outer side panel assemblies 2 as positioning references to complete the Y-direction installation and positioning of the front cover assembly 4, and docking the front cover assembly 4 with the front cover positioning area 31, and completing the X-direction and Z-direction installation and positioning of the front cover assembly 4, the method further includes:

[0070] 401: Install the positioning wiper cover assembly 6 on the front upper crossbeam 5 and the front side longitudinal beam 3.

[0071] The wiper cover assembly 6 is positioned and assembled after the outer side panel assembly 2 and the front cover assembly 4 are assembled. The wiper cover assembly 6 includes a wiper cover body 62, on which a buckle 60 and a wiper cover positioning pin 61 are provided. The wiper cover positioning pin 61 includes a Y-direction positioning pin 41 and a Z-direction positioning pin, such as... Figure 11 As shown, the wiper cover positioning pins 61 located on the left and right sides of the wiper cover body 62 can be set as Z-axis positioning pins, and the wiper cover positioning pin 61 located in the middle of the wiper cover body 62 can be set as Y-axis positioning pins 41. The positioning and fastening scheme of the wiper cover assembly 6 is as follows: the wiper cover body 62 is positioned on the front upper crossbeam 5 and the front side longitudinal beam 3 in the X direction by the buckle 60; the Y direction is positioned by the Y-axis positioning pin 41 in conjunction with the positioning round hole of the front upper crossbeam 5; and the Z direction is positioned by the Z-axis positioning pin in conjunction with the elongated round hole (short axis Z direction) on the left and right sides of the front side longitudinal beam 3.

[0072] In summary, this application follows the principle of prioritizing function, using the door assembly 1 as a reference for positioning and assembling the outer side panel assembly 2, and then using the outer side panel assembly 2 as a reference for positioning and assembling the front hood assembly 4. The positioning and fastening strategies for the front fascia exterior parts of the cab are considered holistically, ensuring that the gap surface difference between exterior parts is shorter than that of traditional self-positioning methods. If the degree of freedom in a certain direction of parts such as the outer side panel assembly 2, the front hood assembly 4, and the wiper cover assembly 6 is based on the body parts as positioning references, then the same part and the same stamping process should be used as positioning reference elements for the holes or planes generated as positioning reference elements, and the fastening points should be arranged and designed close to the positioning elements.

[0073] Secondly, embodiments of this application provide a front fascia for a tractor cab, characterized in that it comprises: assembled using the positioning method for the exterior trim of the tractor cab provided in any of the above embodiments of this application.

[0074] The front of the tractor cab includes a door assembly 1, a front side longitudinal beam 3, an outer side panel assembly 2, and a front cover assembly 4. The front side longitudinal beam 3 is provided with an outer side panel positioning area 30 and a front cover positioning area 31. One end of the outer side panel assembly 2 is connected to the door assembly 1, and the other end is connected to the outer side panel positioning area 30. The front cover assembly 4 is connected to the front cover positioning area 31.

[0075] Therefore, in this application, the different exterior trim positioning points of the tractor cab front are set on the same body structure. That is, the front side longitudinal beam 3 has an outer panel positioning area 30 and a front cover positioning area 31, so that the outer panel assembly 2 and the front cover assembly 4 are positioned on the front side longitudinal beam 3. After the outer panel assembly 2 is installed with the door assembly 1 as the X and Y axis reference, the outer panel positioning area 30 on the front side longitudinal beam 3 is determined. Based on the position of the outer panel positioning area 30, the position of the front cover positioning area 31 on the front side longitudinal beam 3 is determined, so that the outer panel positioning area 30 and the front cover positioning area 31 are located on the same plane, which is generated by the same stamping process. This product structure reduces the dimensional links of the gap surface difference between the outer panel assembly 2 and the front cover assembly 4, and optimizes the vehicle assembly gap surface difference result.

[0076] First, align one side of the outer panel assembly 2 with the door assembly 1 to complete the initial installation and positioning of the outer panel assembly 2 in the X and Y directions. Then, align the other side of the outer panel assembly 2 with the front side longitudinal beam 3 to complete the secondary installation and positioning of the outer panel assembly 2 in the X and Z directions. Next, the position where the outer panel assembly 2 on the front side longitudinal beam 3 aligns with the front side longitudinal beam 3 is designated as the outer panel positioning area 30, and the position where the front cover assembly 4 on the front side longitudinal beam 3 fits against the front side longitudinal beam 3 is designated as the front cover positioning area 31. Ensure that the outer panel positioning area 30 and the front cover positioning area 31 are on the same plane, which is generated by the same stamping process. Finally, using the left and right outer panel assemblies 2 as the positioning reference, use an automatic centering fixture to complete the Y-direction installation and positioning of the front cover assembly 4, and align the front cover assembly 4 with the front cover positioning area 31 to complete the X and Z-direction installation and positioning of the front cover assembly 4.

[0077] The door assembly 1 includes an upper hinge assembly 10, a lower hinge assembly 11, and a door assembly 12. The upper hinge assembly 10 and the lower hinge assembly 11 are connected to the door assembly 12. During the assembly of the door assembly 1, the door assembly 12, the upper hinge assembly 10, and the lower hinge assembly 11 are first assembled on an offline tooling to form the door assembly 1. Then, the door assembly 1 is transferred to the adjustment line, and the door assembly 1 is assembled onto the body of the white car using an assembly template.

[0078] Due to styling requirements and cost reduction needs, some tractor models incorporate an outer side panel assembly 2 between the front hood assembly 4 and the left and right door assemblies 1. The outer side panel assembly 2 functions similarly to a fender in a passenger car. Specifically, the outer side panel assembly 2 includes: an outer side panel body 22, a mating component 20, and a bracket 21. The mating component 20 is fixed to the outer side panel body 22 on the side near the door assembly 1 and is connected to the upper hinge extension shaft positioning component 100 and the lower hinge extension shaft positioning component 110. The bracket 21 is fixed to the other side of the outer side panel body 22 near the front hood assembly 4 and is connected to the outer side panel positioning area 30. The outer side panel body 22 is generally made of engineering plastic. During assembly, the outer side panel assembly 2 is directly connected to the mating part 20 and the upper hinge extension shaft positioning part 100 and the lower hinge extension shaft positioning part 110. The upper hinge extension shaft positioning part 100 and the lower hinge extension shaft positioning part 110 are used to position the outer side panel body 22 in the X and Y directions. Then, the bracket 21 is connected to the front side longitudinal beam 3 to position the outer side panel body 22 in the Z direction. Here, the X direction refers to the length direction of the cab (X+ towards the rear of the vehicle body), and the Y direction refers to the width direction of the cab (Y+ towards the driver's side).

[0079] Furthermore, the upper hinge assembly 10 and the lower hinge assembly 11 include hinge shafts, one end of which extends along a first direction to form an upper hinge extension shaft positioning member 100 and a lower hinge extension shaft positioning member 110 for connection with the outer panel assembly 2; or, an extension rod is fixed at one end of the hinge shaft, the length direction of the extension rod being the first direction; wherein, the first direction refers to the Z direction, which is also the direction of the cab height. Therefore, the mating part 20 is provided with a slot opened along the first direction. When the outer panel assembly 2 is assembled, the mating part 20 is directly snapped onto the hinge shaft or the extension rod, and the hinge shaft is used to position the outer panel body 22 in the X and Y directions. In this way, while ensuring good assembly of the outer panel body 22, the minimum dimensional link of the gap and surface difference between the outer panel body 22 and the door assembly 11 can be directly ensured.

[0080] A bracket 21 is installed on the side of the outer panel body 22 near the front side longitudinal beam 3. Multiple brackets 21 can be installed on the outer panel body 22 along the Z-direction. When the outer panel body 22 is connected to the front side longitudinal beam 3, the brackets 21 are aligned with the front side longitudinal beam 3 in the X-direction. Since the X and Y directions of the outer panel body 22 are positioned via hinge axes, the installation position of the brackets 21 on the outer panel body 22 can be determined based on the position of the outer panel positioning area 30 on the front side longitudinal beam 3. The number of brackets 21 is the same as the number of outer panel positioning areas 30. For example, when there are three brackets 21, there must also be three outer panel positioning areas 30. A positioning hole 210 can be made on the bracket 21. The positioning hole 210 can be an oblong hole (the minor diameter of the oblong hole is in the Z direction). A projection weld nut is set at the positioning area 30 of the outer side plate on the front side longitudinal beam 3. The bolt diameter is 0.5mm smaller than the minor diameter of the oblong hole. The bolt passes through the oblong hole on the bracket 21 and is tightened with the projection weld nut to achieve the positioning of the outer side plate body 22 in the Z direction.

[0081] The premise of the front cover assembly 4 positioning and fastening scheme is that the front cover hinges 41 are arranged on both sides of the upper part of the front cover body 40. The front cover body 40 is assembled into an assembly offline with the front cover hinges 41 and the front cover bolts using tooling. The front cover bolts are arranged on both sides of the lower part of the front cover body 40. The main positioning surface of the front cover assembly 4 is in the X direction, with a total of 4 locations: the contact surface between the front cover hinges 41 and the front side longitudinal beam 3 on the upper part of the front cover body 40 (one symmetrical location on each side); the contact surface between the front cover bolts and the front side longitudinal beam 3 on the lower part of the front cover body 40 (that is, the engagement point between the bolt and the lock body, one symmetrical location on each side).

[0082] This step allows for the positioning and fastening of the front cover assembly 4 in the X direction. To further improve the stability of the front cover assembly 4 during installation, it is also necessary to position and fasten the front cover assembly 4 in the Z direction before fastening the X direction.

[0083] Specifically, a front cover hinge positioning pin 410 is designed on the front cover hinge 41, which cooperates with the elongated hole on the front side longitudinal beam 3. For example, a φ10 front cover hinge positioning pin 410 can be set to cooperate with the elongated hole with a size of 10*16mm (short axis Z direction) on the front side longitudinal beam 3 to determine the Z direction of the front cover assembly 4.

[0084] To ensure that the front cover assembly 4 can be securely fastened with bolts on both sides when closed, before aligning the front cover hinge 41 with the front cover hinge positioning area 310, the following steps are included: installing the front cover hinge 41 onto the upper part of the front cover body 40, ensuring that the top of the front cover hinge 41 is above the front cover body 40. That is, the leaf plate on the front side longitudinal beam 3 where the front cover hinge 41 is fixed must protrude sufficiently from the front cover, meaning there must be a height difference between the top of the front cover hinge 41 and the top of the front cover body 40. Figure 10As shown, a front cover outline 411 can be provided on the front cover hinge 41. When the front cover hinge 41 is connected to the front cover body 40, the front cover outline 411 is used as a reference to ensure that the top of the front cover body 40 fits against the front cover outline 411. This ensures that the front cover assembly 4 can tighten the fastening bolts on the front cover hinge 41 on both sides when the front cover is closed. The remaining fastening bolts at the front cover latch can be tightened after the front cover body 40 is opened.

[0085] The front of the tractor cab also includes a wiper cover assembly 6. The wiper cover assembly 6 is positioned and assembled after the outer side panel assembly 2 and the front hood assembly 4 are assembled. The wiper cover assembly 6 includes a wiper cover body 62, on which are provided a buckle 60 and a wiper cover positioning pin 61. The wiper cover positioning pin 61 includes a Y-direction positioning pin 41 and a Z-direction positioning pin, such as... Figure 11 As shown, the wiper cover positioning pins 61 located on the left and right sides of the wiper cover body 62 can be set as Z-axis positioning pins, and the wiper cover positioning pin 61 located in the middle of the wiper cover body 62 can be set as Y-axis positioning pins 41. The positioning and fastening scheme of the wiper cover assembly 6 is as follows: the wiper cover body 62 is positioned on the front upper crossbeam 5 and the front side longitudinal beam 3 in the X direction by the buckle 60; the Y direction is positioned by the Y-axis positioning pin 41 in conjunction with the positioning round hole of the front upper crossbeam 5; and the Z direction is positioned by the Z-axis positioning pin in conjunction with the elongated round hole (short axis Z direction) on the left and right sides of the front side longitudinal beam 3.

[0086] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0087] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0088] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for positioning exterior trim components of the front fascia of a tractor cab, characterized in that, It includes steps of: One side of the outer side plate assembly (2) is connected with the door assembly (1), and the X and Y direction preliminary installation and positioning of the outer side plate assembly (2) are completed; The other side of the outer side plate assembly (2) is connected with the front wall side longitudinal beam (3), and the X direction secondary installation and positioning and the Z direction installation and positioning of the outer side plate assembly (2) are completed; The outer side plate assembly (2) on the front wall side longitudinal beam (3) is connected with the front wall side longitudinal beam (3) at the position of the outer side plate positioning area (30), the front cover assembly (4) on the front wall side longitudinal beam (3) is connected with the front wall side longitudinal beam (3) at the position of the front cover positioning area (31), so that the outer side plate positioning area (30) and the front cover positioning area (31) are located on the same plane, and the plane is generated by stamping the same process; The Y direction installation and positioning of the front cover assembly (4) is completed by taking the left and right outer side plate assemblies (2) as the positioning reference, the front cover assembly (4) is connected with the front cover positioning area (31), and the X and Z direction installation and positioning of the front cover assembly (4) are completed.

2. The tractor cab front face trim piece positioning method of claim 1, wherein, The Y direction installation and positioning of the front cover assembly (4) is completed by taking the left and right outer side plate assemblies (2) as the positioning reference, the front cover assembly (4) is connected with the front cover positioning area (31), and the X and Z direction installation and positioning of the front cover assembly (4) are completed. The rain cover plate assembly (6) is installed and positioned on the front wall upper cross beam (5) and the front wall side longitudinal beam (3).

3. The tractor cab front face trim piece positioning method of claim 1, wherein: The front cover assembly (4) comprises a front cover body (40), two front cover hinges (41) and two front cover locks, the two front cover hinges (41) and the two front cover locks are installed on the front cover body (40); The front cover positioning area (31) comprises a front cover hinge positioning area (310) and a front cover lock positioning area (311), and the front cover lock positioning area (311) is provided with a front cover lock body; The front cover assembly (4) is connected with the front cover positioning area (31), and the specific steps comprise: The front cover hinge (41) is connected with the front cover hinge positioning area (310); The front cover lock is connected with the front cover lock body installed on the front cover lock positioning area (311).

4. The tractor cab front face trim piece positioning method of claim 3, wherein: Before the front cover hinge (41) is connected with the front cover hinge positioning area (310), the step further comprises: The front cover hinge (41) is installed on the upper part of the front cover body (40) by using a split clamp, and at least one fastening area of the front cover hinge (41) connected with the front cover hinge positioning area (310) is located above the front cover body (40), so that at least one fastening screw of the single-side front cover hinge (41) on the vehicle body can be tightened in the closed state of the front cover body (40).

5. The tractor cab front face outer decoration part positioning method of claim 1, wherein: The outer side plate assembly (2) has two, and the front cover assembly (4) is located between the two outer side plate assemblies (2); After the Y direction installation and positioning of the front cover assembly (4) is completed by taking the left and right outer side plate assemblies (2) as the positioning reference, before the front cover assembly (4) is connected with the front cover positioning area (31), the method further comprises: Check if the gap between the front cover assembly (4) and the outer side plate assembly (2) on both sides is consistent. If not, adjust the position of the front cover assembly (4) until the gap on both sides of the front cover assembly (4) and the outer side plate assembly (2) on both sides is consistent.

6. A tractor cab front face characterized in that, It comprises: Assembled by using the positioning method of the tractor cab front face outer decoration part according to any one of claims 1 to 5.

7. The tractor cab front face of claim 6, wherein: The door assembly (1) comprises an upper hinge assembly (10) and a lower hinge assembly (11), the hinge shafts of the upper hinge assembly (10) and the lower hinge assembly (11) extend in the first direction at one end to form an upper hinge extended shaft positioning piece (100) for connecting with the outer side plate assembly (2), and the hinge shafts of the lower hinge assembly (11) extend in the first direction at one end to form a lower hinge extended shaft positioning piece (110) for connecting with the outer side plate assembly (2).

8. The tractor cab front face of claim 7, wherein, The outer side plate assembly (2) comprises: An outer side plate body (22); A matching piece (20) fixed to the outer side plate body (22) near the side of the door assembly (1), the matching piece (20) is connected with the upper hinge extended shaft positioning piece (100) and the lower hinge extended shaft positioning piece (110); A bracket (21) fixed to the other side of the outer side plate body (22) near the front cover assembly (4), the bracket (21) is connected with the outer side plate positioning area (30).

9. The tractor cab front face of claim 6, wherein: The front cover assembly (4) comprises a front cover body (40), two front cover hinges (41) and two front cover latches, the two front cover hinges (41) and the two front cover latches are installed on the front cover body (40); The front cover positioning area (31) comprises a front cover hinge positioning area (310) and a front cover latch positioning area (311), the front cover latch positioning area (311) is provided with a front cover latch body, the front cover hinge (41) is connected with the front cover hinge positioning area (310), and the front cover latch is connected with the front cover latch body installed on the front cover latch positioning area (311).

10. The tractor cab front face according to claim 9, characterized in that: The front cover hinge (41) is arranged on the upper part of the front cover body (40), and the area where the front cover hinge (41) is connected with the front cover hinge positioning area (310) has at least one fastening area of a bolt located above the front cover body (40).

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