body frame

Abstract

The present invention relates to a vehicle body frame, which includes a lower body, a left side panel, and a right side panel. The lower body includes two symmetrically arranged lower body A-pillars, two front floor longitudinal beams, and two rear floor longitudinal beams. The left side panel and the right side panel each include two symmetrically arranged side panel A-pillars and a front sill beam connected to the bottom of the side panel A-pillar. The upper portion of the lower body A-pillar is fixed to the upper portion of the side panel A-pillar by a main positioning system joint reinforcement assembly. The lower portion of the side panel A-pillar is fixed to the lower portion of the lower body A-pillar by a secondary positioning system joint reinforcement assembly. The rear portion of the front sill beam is fixed to the rear portion of the front floor longitudinal beam by an auxiliary positioning system joint reinforcement assembly. The left side panel, the right side panel, and the lower body are positioned and assembled in the Y direction or the Z direction by the main positioning system joint reinforcement assembly, the secondary positioning system joint reinforcement assembly, and the auxiliary positioning system joint reinforcement assembly. The present invention adopts a modular structural design, and a complete vehicle body frame is formed by assembly to achieve precise positioning. It saves the investment in a total assembly welding production line, simplifies the production process, and reduces production difficulty and cost.

Description

Technical Field

[0001] The present invention relates to an automobile body structure, in particular to a vehicle body frame. Background Art

[0002] The production and manufacturing of automobiles is divided into four major production processes: stamping, welding, painting, and assembly. The body frame of a car needs to go through the three major processes of mold stamping, welding assembly, and painting and anti-corrosion before it can enter the assembly workshop and be matched with other automobile parts to be installed into an automobile product. The body frame is an important carrier of the vehicle and is also the only core component that runs through the four major production processes.

[0003] Traditional automobile body manufacturing involves welding hundreds of stamped parts into dozens of sub-assemblies, which are then connected through assembly welding lines and finally welded into a body frame assembly through a main assembly line. The variety and quantity of parts are large, which requires the large-scale use of land resources, the construction and planning of large-scale manufacturing workshops, and the investment in production equipment for product lines. In addition, energy consumption, material transfer, environmental pollution, personnel recruitment, management training, and safety hazards all come at a huge cost of billions or even tens of billions of dollars.

[0004] Under the traditional assembly method, the body frame has been completely welded into a cage-type frame structure. Assembly workers need to drill in and out with tools and parts. Large parts are especially difficult to assemble under the cage-type frame structure, and there are dead corners that cannot be used, which affects production timeliness. Summary of the Invention

[0005] The purpose of the present invention is to provide a vehicle body frame that uses an assembly positioning system to assemble the left side panel, the right side panel and the lower body, eliminating the investment in a general assembly welding production line, simplifying the production process, and reducing production difficulty and cost. Its various modules can be subcontracted for production, independently transported, and assembled in different locations. The space occupied by the module is significantly reduced, the transportation time is significantly improved, and the warehousing and logistics costs are greatly reduced.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: A vehicle body frame adopts a modular structural design and is assembled to form a complete vehicle body frame, which includes a lower body, a left side panel and a right side panel assembled on both sides of the lower body, the lower body including two symmetrically arranged lower body A-pillars, two front floor longitudinal beams and two rear floor longitudinal beams, the left side panel and the right side panel both include two symmetrically arranged side panel A-pillars and a front sill beam connected to the bottom of the side panel A-pillars, the upper part of the lower body A-pillar and the upper part of the side panel A-pillar are fixed by a main positioning system joint reinforcement assembly, the lower part of the side panel A-pillar and the lower part of the lower body A-pillar are fixed by a secondary positioning system joint reinforcement assembly, the rear part of the front sill beam and the rear part of the front floor longitudinal beam are fixed by an auxiliary positioning system joint reinforcement assembly, and the left side panel, the right side panel and the lower body are positioned and assembled in the Y direction or the Z direction by the main positioning system joint reinforcement assembly, the secondary positioning system joint reinforcement assembly and the auxiliary positioning system joint reinforcement assembly.

[0007] The main positioning system joint reinforcement assembly includes a first upper body fixed to the upper part of the side A-pillar, a first lower body and a bolt fixed to the upper part of the lower body A-pillar, the first upper body includes a first upper body base and a first upper connecting piece fixed to the outer surface of the first upper body base, the first lower body includes a first lower body base and a first lower connecting piece fixed to the inner surface of the first lower body base, the first upper connecting piece and the first lower connecting piece are fixedly connected, and the connection method is bolt connection, gluing or riveting.

[0008] The first upper connecting member has a first upper body screw hole running through its upper and lower surfaces, the center line of the first upper body screw hole is parallel to the outer surface of the first upper body base, the first lower connecting member has a first receiving groove for accommodating the first upper connecting member, a first lower body screw hole is provided at the bottom of the first receiving groove, the first lower body screw hole has an internal thread, the bolt passes through the first upper body screw hole and engages with the internal thread of the first lower body screw hole.

[0009] The left side panel and the right side panel also include a mounting longitudinal beam connected to the upper end of the side panel A-pillar, and the lower body also includes a mounting cross beam connecting the two lower body A-pillars. The inner surface of the first upper body base is fixed to the front outer end surface of the mounting longitudinal beam in the Y direction, and the first lower connecting piece is installed in the upper cavity of the lower body A-pillar. The first upper connecting piece is installed in the first receiving groove in a vertical direction, and the bolt passes through the first upper body screw hole and the first lower body screw hole in sequence from top to bottom.

[0010] The left side panel and the right side panel also include a mounting longitudinal beam connected to the upper end of the side panel A-pillar, and the lower body also includes a mounting crossbeam connecting the two lower body A-pillars. The inner surface of the first upper body base is fixed to the front outer end surface of the mounting longitudinal beam in the Z direction, the first lower connecting piece is installed in the side cavity of the mounting crossbeam, and the first upper connecting piece is installed in the first receiving groove in a horizontal direction. The bolt passes through the first upper body screw hole and the first lower body screw hole in sequence from the outside to the inside.

[0011] The auxiliary positioning system joint reinforcement assembly includes a second upper body fixed to the lower part of the side A-pillar, a second lower body fixed to the lower part of the lower body A-pillar and a bolt, and a second receiving groove is formed inwardly recessed from the bottom of the second upper body, and the second lower body includes a first base and a matching block extending outward from the surface of the first base, and the two sides of the second receiving groove are respectively a first guide block and a second guide block, and a second base located on the surface of the first base is spaced apart on one side of the matching block, and a guide groove is formed between the matching block and the second base, and the second guide block is installed in the guide groove, and the matching block is installed in the second receiving groove and fixedly connected to the second upper body, and the connection method is bolt connection, gluing or riveting.

[0012] The second upper body has a second upper body screw hole that passes through the bottom of the second receiving groove, and the matching block has a second lower body screw hole that passes through the first base. The second lower body screw hole has an internal thread, and the bolt passes through the second upper body screw hole and is engaged with the internal thread of the second lower body screw hole.

[0013] The inner side surface of the second upper body is fixed to the outer end surface of the front part of the front sill beam in the Y direction, the bottom surface of the second lower body is fixed to the front top surface of the front floor longitudinal beam, the second receiving groove covers the matching block in the vertical direction, the bolt passes through the second upper body screw hole and the second lower body screw hole in sequence from top to bottom, the inner side surface of the second upper body is fixed to the outer end surface of the front part of the front sill beam in the Z direction, the outer end surface of the second lower body is fixed to the front top surface of the front floor longitudinal beam, the second receiving groove covers the matching block in the horizontal direction, and the bolt passes through the second upper body screw hole and the second lower body screw hole in sequence from outside to inside.

[0014] The auxiliary positioning system joint reinforcement assembly includes a third upper body fixed to the rear of the front door sill beam and a third lower body fixed to the rear of the front floor longitudinal beam. The third upper body includes a third upper body base and a third upper connecting member fixed to the outer surface of the third upper body base. The third lower body has a third receiving groove that is recessed from the outside to the inside. The third upper connecting member is installed in the third receiving groove and fixedly connected to the third lower body. The connection method is bolt connection, adhesive connection or riveting.

[0015] The third upper connecting member is a trapezoidal structure, a columnar structure, a hemispherical structure, a conical structure, or a rectangular structure, and the third receiving groove matches the third upper connecting member.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention assembles the left and right side panels with the lower body by providing an assembly positioning system. During installation, the left and right side panels can be precisely positioned with the lower body, and the welding deformation of the frame can be automatically corrected to ensure that the assembly hardpoint area meets the design requirements. This eliminates the need for a complete assembly welding production line, simplifies the production process, and reduces production difficulty and cost. Each module can be subcontracted for production, independently transported, and assembled at a different location, significantly reducing the space occupied, significantly improving transportation efficiency, and significantly reducing warehousing and logistics costs.

[0018] 2. The present invention locates the main positioning connection point at the junction between the upper portion of the lower body A-pillar of the lower body and the upper portion of the side panel A-pillar of the left or right side panel, and uses the main positioning system joint to strengthen the assembly parts. The upper area of the lower body A-pillar is equipped with core components such as the windshield, engine cover and hinges, doors and hinges, fenders, shock absorbers, instrument panel and pipe beam, and steering column. This can effectively maintain the dimensional accuracy of the upper area of the lower body A-pillar and reduce the difficulty of component assembly.

[0019] 3. The present invention locates a secondary positioning connection point at the junction between the lower end of the lower body A-pillar of the lower body and the lower end of the side panel A-pillar of the left or right side panel, and strengthens the fixation of the assembly parts through the secondary positioning system joint. Core components such as the door and hinge, fender, and A-pillar lower trim (with instrument panel) are installed in the lower area of the A-pillar. This can effectively maintain the dimensional accuracy of the upper area of the lower body A-pillar, reducing the difficulty of component assembly.

[0020] 4. The present invention provides an auxiliary positioning connection point at the junction of the rear end of the front sill beam and the rear end of the front floor longitudinal beam, and strengthens the fixation of the assembly parts through the auxiliary positioning system joint. The front sill beam area, namely the lower and middle sections of the B-pillar and the C-pillar, is equipped with core components such as the vehicle doors and locking mechanisms, interior seats and locking mechanisms, seat belts, rear suspension trailing arms, shock absorbers, coil springs, wheels, tailgate, and rear bumper. This can effectively maintain the dimensional accuracy of the upper area of the lower body A-pillar and reduce the difficulty of component assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the vehicle body frame assembly structure of the present invention;

[0022] Figure 2 for Figure 1 Schematic diagram of the exploded structure of the vehicle body frame;

[0023] Figure 3 for Figure 2 Schematic diagram of the middle and lower body, left side panel, and right side panel structures;

[0024] Figure 4 This is a schematic diagram of the main positioning connection points between the left side panel and the lower body of the present invention;

[0025] Figure 5 for Figure 4 Schematic diagram of the structure of the joint reinforcement assembly of the central main positioning system;

[0026] Figure 6 for Figure 5 Cross-sectional view of the central main positioning system joint reinforcement assembly;

[0027] Figure 7 This is a schematic diagram of the secondary positioning connection point between the left side panel and the lower vehicle body of the present invention;

[0028] Figure 8 for Figure 7 Schematic diagram of the structure of the joint reinforcement assembly of the center auxiliary positioning system;

[0029] Figure 9 for Figure 8 Cross-sectional view of the joint reinforcement assembly of the center sub-positioning system;

[0030] Figure 10 Schematic diagram of the auxiliary positioning connection point between the lower vehicle body and the left side panel of the present invention;

[0031] Figure 11 for Figure 10 Schematic diagram of the structure of the joint reinforcement assembly of the auxiliary positioning system;

[0032] Figure 12 for Figure 11 Cross-sectional view of the auxiliary positioning system joint reinforcement assembly. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] See also Figures 1 to 12 The present invention is a vehicle body frame, which includes a lower body 1, a left side panel 2, a right side panel 3, a rear panel 4, and a top crossbeam 5. Specifically, the left and right side panels are assembled on both sides of the lower body 1, the rear panel 4 is assembled at the rear end of the upper body 1, and the top crossbeam 5 is assembled with the upper ends of the left and right side panels.

[0035] See also Figure 2The lower body 1 includes two symmetrically arranged lower body A-pillars 11, and a front floor and a rear floor connected to the bottom of the two lower body A-pillars 11. Specifically, the front floor has two front floor longitudinal beams 12 on either side, and the rear floor has two rear floor longitudinal beams 13 on either side. Both the left and right side panels include a side panel A-pillar 21, a front sill beam 22 connected to the bottom of the side panel A-pillar 21, and a side panel lower sill 23 located behind the front sill beam 22.

[0036] See also Figure 3 The left side panel or the right side panel is positioned and connected to the lower body 1 through the main positioning connection point 100, the secondary positioning connection point 200, and the auxiliary positioning connection point 300. The main positioning connection point 100, the secondary positioning connection point 200, and the auxiliary positioning connection point 300 constitute an assembly positioning system.

[0037] See also Figure 4 and Figure 5 The main positioning connection point 100 is where the upper portion (100A) of the lower body A-pillar 11 and the upper portion (100B) of the side A-pillar 21 meet, and the two are connected by the main positioning system joint reinforcement assembly 10. The main positioning system joint reinforcement assembly 10 includes a first upper body 101 fixed to the upper portion of the side A-pillar 21 and a first lower body 102 fixed to the upper portion of the lower body A-pillar 11.

[0038] See also Figure 4 The left side panel or the right side panel also includes a mounting longitudinal beam 24 connected to the upper end of the side panel A-pillar 21, and the first upper body 101 is fixed to the front outer end surface of the mounting longitudinal beam 103 in the Y direction or the Z direction; the lower body 1 also includes a mounting cross beam 15 connecting the two lower body A-pillars 11, and the first lower body 102 is fixed to the upper outer end surface of the lower body A-pillar 11 or the side outer end surface of the mounting cross beam 15. Specifically, the first upper body 101 fixed to the front outer end surface of the mounting longitudinal beam 103 in the Y direction and the first lower body 102 fixed to the upper outer end surface of the lower body A-pillar 11 are positioned and assembled in the Y direction; the first upper body 101 fixed to the front outer end surface of the mounting longitudinal beam 103 in the Z direction and the first lower body 102 fixed to the side outer end surface of the mounting cross beam 15 are positioned and assembled in the Z direction.

[0039] See also Figure 5 The first upper body 101 includes a first upper body base 1011 and a first upper connecting member 1012 fixed to the outer surface of the first upper body base 1011. The axis of the first upper body base is perpendicular to the axis of the first upper connecting member. The first upper connecting member 1012 has a first upper body screw hole 10121 extending through its upper and lower surfaces. The centerline of the first upper body screw hole 10121 is parallel to the outer surface of the first upper body base 1011. The inner surface of the first upper body base 1011 is fixed to the front outer end surface of the mounting longitudinal beam 103 in the Y direction or the Z direction.

[0040] For details, see Figure 6 The first upper connecting member 1012 comprises a primarily cylindrical structure, comprising a first upper section 10121, a first middle section 10122, and a first lower section 10123. The width of the first upper section 10121 is greater than that of the first middle section 10122. The first middle section 10122 is a plum blossom-shaped columnar structure that corrects module assembly angles, correcting skew during guide assembly. It also reduces assembly friction and aids positioning. The outer diameter of the first lower section 10123 gradually decreases from the inside outward, with the maximum outer diameter of the first lower section 10123 not exceeding the outer diameter of the first middle section 10122.

[0041] See also Figure 5 The first lower body 102 includes a first lower body base 1021 and a first lower connecting member 1022 fixed to the inner surface of the first lower body base 1021 and coaxial with the first lower body base 1021. The first lower connecting member 1022 is installed in the upper cavity of the lower body A-pillar 11 or the side cavity of the mounting crossbeam 15. The inner surface of the first lower body base 1021 is fixedly connected to the upper outer end surface of the lower body A-pillar 11 or the side outer end surface of the mounting crossbeam 15.

[0042] See also Figure 5 and Figure 6 The first lower connecting member 1022 has a first receiving groove 1023 that passes through the first lower body base. The first upper connecting member 1012 is installed in the first receiving groove 1023 and rotates around the axis of the first lower body base 1021. The first receiving groove 1023 includes a first upper groove body 10231 and a first lower groove body 10232.

[0043] Specifically, the barrel-shaped structure of the first upper groove body 10231 serves to correct the assembly angle, preventing the guide from tilting during assembly and ensuring vertical engagement. The inner diameter of the first lower groove body 10232 gradually decreases from the inner end of the first upper groove body 10231 outward.

[0044] See also Figure 6 The bottom of the first receiving groove 1023 is provided with a first lower body screw hole 10233 having an internal thread. The inner diameter of the first upper groove 10231 is larger than the maximum inner diameter of the first lower groove 10232. A first step 10234 is formed at the connection between the first lower body screw hole 10233 and the first lower groove 10232.

[0045] The first middle section 10122 is installed in the first upper section groove 10231, and the first lower section 10123 is installed in the first lower section groove 10232. The outer end surface of the first lower section 10123 abuts against the first step 10234. The first upper section 10121 abuts against the outer surface of the first lower body base 1021.

[0046] The bolt passes through the first upper body screw hole 10121 of the first upper body 101 and penetrates into the first lower body screw hole 10233. The internal thread inside the first lower body screw hole 10233 is engaged with the bolt, eliminating the nut during the assembly process, realizing one-way operation of the bolt for installation, and improving assembly efficiency.

[0047] A first reinforcing rib is provided at the connection between the first upper section and the first upper body base, and a plurality of second reinforcing ribs are evenly provided on the outer surface of the first lower connecting piece.

[0048] The inner surface of the base of the first upper body is hollowed out to reduce the surface matching error caused by the large-area contact with the upper part of the side A-pillar 21.

[0049] The inner surface of the first upper body base 1011 is fixed to the front outer end surface of the mounting longitudinal beam 103 in the Y direction, and the first lower connecting member 1022 is installed in the upper cavity of the lower body A-pillar 11. The first upper connecting member 1012 is installed in the first receiving groove 1023 in the vertical direction. The bolts pass through the first upper body screw hole 10121 and the first lower body screw hole 10233 from top to bottom in sequence to realize the positioning and assembly of the first upper body 101 and the first lower body 102 in the Y direction.

[0050] The inner surface of the first upper body base 1011 is fixed to the front outer end surface of the mounting longitudinal beam 103 in the Z direction. The first lower connecting member 1022 is installed in the side cavity of the mounting crossbeam 15. The first upper connecting member 1012 is installed horizontally in the first receiving groove 1023. Bolts pass through the first upper body screw hole 10121 and the first lower body screw hole 10233 from the outside to the inside, thereby achieving the positioning and assembly of the first upper body 101 and the first lower body 102 in the Z direction. The connection method of the first upper body 101 and the first lower body 102 is not limited to bolt connection. Other connection methods such as gluing or riveting can also be used.

[0051] See also Figure 7 and Figure 8 The secondary positioning connection point 200 is where the lower portion (200B) of the side A-pillar 21 is connected to the lower portion (200A) of the lower body A-pillar 11, and the two are connected by the secondary positioning system joint reinforcement assembly 20.

[0052] See also Figure 7 The auxiliary positioning system joint reinforcement assembly 20 includes a second upper body 201 fixed to the lower portion of the side A-pillar and a second lower body 202 fixed to the front top surface of the front floor longitudinal beam 12 in the Y direction or the Z direction.

[0053] The second upper body 201 has a second receiving groove 2011 formed inwardly from the bottom, and two sides of the second receiving groove 2011 are respectively a first guide block 2012 and a second guide block 2013 .

[0054] The second lower body 202 includes a first base 2022 and a mating block 2021 extending outward from the surface of the first base 2022. A second base 2023 is spaced apart from the mating block 2021 and located on the surface of the first base 2022. A guide groove 2024 is formed between the mating block 2021 and the second base 2023. The second guide block 2013 is mounted in the guide groove 2013. The mating block 2021 is mounted in the second receiving groove 2011 and is fixedly connected to the second upper body 201. The bottom of the first base 2022 is hollowed out.

[0055] The matching block 2021 is a trapezoidal structure, and both sides of the matching block 2021 have first inclined surfaces 20212 . The second receiving groove 2011 matches the matching block 2021 , and the first inclined surfaces 20212 fit the side surfaces of the second receiving groove 2011 .

[0056] A part is cut off at both ends of the matching block 2021 to form a second inclined surface 20213, and the bottom of the second receiving groove 2011 is recessed inward to form an inner groove 20111. Both ends of the inner groove 20111 have guide inclined surfaces 20112, and the second inclined surface 20213 is fitted with the guide inclined surface 20112. By setting the first inclined surface 20212 and the second inclined surface 20213, the matching block 2021 and the second receiving groove 2011 can be assembled to absorb errors.

[0057] The inner surface of the second base 2023 is inclined and extends outward from the bottom of the guide groove 2013 . The inner surface of the second base 2023 is clearance-matched with the outer surface of the second guide block 2013 .

[0058] The second upper body 201 has a second upper body screw hole 2014 running through its upper and lower surfaces, and the matching block 2021 has a second lower body screw hole 20211 running through its upper and lower surfaces. The second upper body screw hole 2014 is connected to the second receiving groove 2011, and the second lower body screw hole 20211 has an internal thread. The bolt passes through the second upper body screw hole 2014 and engages with the internal thread of the second lower body screw hole 20211.

[0059] The inner side surface 2015 of the second upper body 201 is fixed to the front outer end surface of the front door sill beam 22 in the Y direction, the bottom of the first base 2022 is fixed to the front top surface of the front floor longitudinal beam 12, the second receiving groove 2011 covers the matching block 2021 in the vertical direction, and the bolt passes through the second upper body screw hole and the second lower body screw hole in sequence from top to bottom.

[0060] The inner side surface 2015 of the second upper body is fixed to the front outer end surface of the front door sill beam in the Z direction. The bottom of the second base 2023 is fixed to the front top surface of the front floor longitudinal beam. The second receiving groove 2011 horizontally covers the mating block 2021. Bolts pass through the second upper body screw holes and the second lower body screw holes in sequence from the outside to the inside. The connection between the second upper body and the second lower body is not limited to bolting; other connection methods such as gluing or riveting can also be used.

[0061] See also Figure 10 and Figure 11 The auxiliary positioning connection point 300 is where the rear portion (300B) of the front sill beam 22 of the left side panel 2 is connected to the rear portion (300A) of the front floor longitudinal beam 12 of the lower vehicle body 1, and the two are fixedly connected by the auxiliary positioning system joint reinforcement assembly 30.

[0062] The auxiliary positioning system joint reinforcement assembly 30 includes a third upper body 301 fixed to the rear outer end surface of the front rocker beam 22 in the Y direction or the Z direction and a third lower body 302 fixed to the rear top surface of the front floor longitudinal beam 12 in the Y direction or the Z direction.

[0063] Specifically, the third upper body 301 fixed to the rear outer end surface of the front sill beam 22 in the Y direction and the third lower body 302 fixed to the rear top surface of the front floor longitudinal beam 12 in the Y direction are positioned and assembled in the Y direction; the third upper body 301 fixed to the rear outer end surface of the front sill beam 22 in the Z direction and the third lower body 302 fixed to the rear top surface of the front floor longitudinal beam 12 in the Z direction are positioned and assembled in the Z direction.

[0064] See also Figure 11 The third upper body 301 includes a third upper body base 3011 and a third upper connecting member 3012 fixed to the outer surface of the third upper body base 3011. In this embodiment, the third upper connecting member 3012 has a trapezoidal structure, including two parallel surfaces and two inclined surfaces connecting the two parallel surfaces. The third upper body screw hole passes through the two parallel surfaces. The two side surfaces of the third receiving groove are inclined and extend outward from the bottom of the third receiving groove. The two inclined surfaces of the third upper connecting member are in contact with the two side surfaces of the third receiving groove.

[0065] However, this structure is not limited to a trapezoidal shape and can also include other shapes such as cylindrical, hemispherical, conical, and rectangular. The third upper connecting member 3012 serves as an assembly guide, allowing for correction of the longitudinal dimensions of the vehicle frame during assembly. The third upper connecting member 3012 has third upper body screw holes 30121 extending through its upper and lower surfaces. The axes of these third upper body screw holes are perpendicular to the axis of the third upper body base. The inner surface of the third upper body base 3011 is fixed to the rear outer end surface of the front door sill beam 22 in the Y or Z direction.

[0066] See also Figure 11 The third lower body 302 has a third receiving groove 3021 that is recessed from the outside to the inside. The third upper connecting member 3012 is mounted within this third receiving groove 3021. The bottom of the third receiving groove 3021 has a third lower body screw hole 3022 extending through its upper and lower surfaces. The third lower body screw hole 3022 has internal threads. Bolts pass through the third upper body screw holes 30121 and engage with the internal threads in the third lower body screw holes 3022, enabling one-way bolt installation and improving assembly efficiency. Furthermore, the third upper connecting member is mounted within the third receiving groove and secured to the third lower body via gluing or riveting.

[0067] See also Figure 12 The third lower body 302 has a third bottom surface 3023 and two third side surfaces 3024. The third lower body 302 is fixed to the rear top surface of the front floor longitudinal beam 12 in the Y direction, meaning that the third bottom surface 3023 is fixed to the rear top surface of the front floor longitudinal beam 12, thereby positioning and assembling the third upper body 301 and the third lower body 302 in the Y direction. The third lower body 302 is fixed to the rear top surface of the front floor longitudinal beam 12 in the Z direction, meaning that the third bottom surface 3023 is rotated 90 degrees, and one of the third side surfaces 3024 is fixed to the rear top surface of the front floor longitudinal beam 12, thereby positioning and assembling the third upper body 301 and the third lower body 302 in the Z direction. The surface of the third upper body base 3011 is in close proximity to one of the third side surfaces 3024.

[0068] The lower body 1 is spliced and assembled with the left and right side panels through the main positioning system joint reinforcement assembly parts 10, the secondary positioning system joint reinforcement assembly parts 20, and the auxiliary positioning system joint reinforcement assembly parts 30 with different structures, thereby ensuring structural strength and eliminating environmental pollution caused by partial welding. During the assembly process, assembly workers do not need to drill in and out with tools and parts, thereby improving work efficiency.

[0069] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A vehicle body frame comprising a lower body, a left side panel and a right side panel assembled on either side of the lower body, the lower body comprising two symmetrically arranged lower body A-pillars, two front floor longitudinal beams, and two rear floor longitudinal beams, the left side panel and the right side panel each comprising two symmetrically arranged side panel A-pillars and a front sill beam connected to the bottom of the side panel A-pillars, characterized in that: The upper portion of the lower body A-pillar is fixed to the upper portion of the side panel A-pillar by a main positioning system joint reinforcement assembly, the lower portion of the side panel A-pillar is fixed to the lower portion of the lower body A-pillar by a secondary positioning system joint reinforcement assembly, the rear portion of the front sill beam is fixed to the rear portion of the front floor longitudinal beam by an auxiliary positioning system joint reinforcement assembly, and the left side panel, right side panel and lower body are all positioned and assembled in the Y direction or the Z direction by the main positioning system joint reinforcement assembly, the secondary positioning system joint reinforcement assembly and the auxiliary positioning system joint reinforcement assembly; The main positioning system joint reinforcement assembly includes a first upper body fixed to the upper portion of the side A-pillar, a first lower body fixed to the upper portion of the lower body A-pillar, and a bolt; the first upper body includes a first upper body base and a first upper connecting member fixed to the outer surface of the first upper body base; the first lower body includes a first lower body base and a first lower connecting member fixed to the inner surface of the first lower body base; the first upper connecting member and the first lower connecting member are fixedly connected, and the connection method is bolt connection, adhesive connection, or riveting; The auxiliary positioning system joint reinforcement assembly includes a second upper body fixed to the lower part of the side panel A-pillar, a second lower body fixed to the lower part of the lower body A-pillar and a bolt, a second receiving groove is formed inwardly recessed from the bottom of the second upper body, the second lower body includes a first base and a matching block extending outward from the surface of the first base, the two sides of the second receiving groove are respectively a first guide block and a second guide block, a second base located on the surface of the first base is spaced apart on one side of the matching block, a guide groove is formed between the matching block and the second base, the second guide block is installed in the guide groove, the matching block is installed in the second receiving groove and is fixedly connected to the second upper body, and the connection method is bolt connection, adhesive connection or riveting; The auxiliary positioning system joint reinforcement assembly includes a third upper body fixed to the rear of the front door sill beam and a third lower body fixed to the rear of the front floor longitudinal beam. The third upper body includes a third upper body base and a third upper connecting member fixed to the outer surface of the third upper body base. The third lower body has a third receiving groove that is recessed from the outside to the inside. The third upper connecting member is installed in the third receiving groove and is fixedly connected to the third lower body. The connection method is bolt connection, gluing or riveting.

2. The vehicle body frame according to claim 1, wherein: The first upper connecting member has a first upper body screw hole running through its upper and lower surfaces, the center line of the first upper body screw hole is parallel to the outer surface of the first upper body base, the first lower connecting member has a first receiving groove for accommodating the first upper connecting member, a first lower body screw hole is provided at the bottom of the first receiving groove, the first lower body screw hole has an internal thread, the bolt passes through the first upper body screw hole and engages with the internal thread of the first lower body screw hole.

3. The vehicle body frame according to claim 2, wherein: The left side panel and the right side panel also include a mounting longitudinal beam connected to the upper end of the side panel A-pillar, and the lower body also includes a mounting cross beam connecting the two lower body A-pillars. The inner surface of the first upper body base is fixed to the front outer end surface of the mounting longitudinal beam in the Y direction, and the first lower connecting piece is installed in the upper cavity of the lower body A-pillar. The first upper connecting piece is installed in the first receiving groove in a vertical direction, and the bolt passes through the first upper body screw hole and the first lower body screw hole in sequence from top to bottom.

4. The vehicle body frame according to claim 2, wherein: The left side panel and the right side panel also include a mounting longitudinal beam connected to the upper end of the side panel A-pillar, and the lower body also includes a mounting crossbeam connecting the two lower body A-pillars. The inner surface of the first upper body base is fixed to the front outer end surface of the mounting longitudinal beam in the Z direction, the first lower connecting piece is installed in the side cavity of the mounting crossbeam, and the first upper connecting piece is installed in the first receiving groove in a horizontal direction. The bolt passes through the first upper body screw hole and the first lower body screw hole in sequence from the outside to the inside.

5. The vehicle body frame according to claim 1, wherein: The second upper body has a second upper body screw hole that passes through the bottom of the second receiving groove, and the matching block has a second lower body screw hole that passes through the first base. The second lower body screw hole has an internal thread, and the bolt passes through the second upper body screw hole and is engaged with the internal thread of the second lower body screw hole.

6. The vehicle body frame according to claim 5, characterized in that: The inner side surface of the second upper body is fixed to the outer end surface of the front part of the front sill beam in the Y direction, the bottom surface of the second lower body is fixed to the front top surface of the front floor longitudinal beam, the second receiving groove covers the matching block in the vertical direction, the bolt passes through the second upper body screw hole and the second lower body screw hole in sequence from top to bottom, the inner side surface of the second upper body is fixed to the outer end surface of the front part of the front sill beam in the Z direction, the outer end surface of the second lower body is fixed to the front top surface of the front floor longitudinal beam, the second receiving groove covers the matching block in the horizontal direction, and the bolt passes through the second upper body screw hole and the second lower body screw hole in sequence from outside to inside.

7. The vehicle body frame according to claim 1, wherein: The third upper connecting member is a trapezoidal structure, a columnar structure, a hemispherical structure, a conical structure, or a rectangular structure, and the third receiving groove matches the third upper connecting member.

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