Vehicle D column structure, manufacturing method thereof and vehicle

Abstract

The invention discloses a vehicle D column structure, a manufacturing method thereof and a vehicle, the vehicle D column structure comprises a rear support column reinforcing plate assembly, a rear support column inner plate assembly and a D column tubular beam assembly, and the D column tubular beam assembly is arranged between the rear support column reinforcing plate assembly and the rear support column inner plate assembly. The D-column tubular beam assembly comprises a D-column tubular beam extending in the longitudinal direction and a plurality of connectors arranged at the two ends of the D-column tubular beam. The multiple connectors comprise a C-column tubular beam connector located at one end, a D-column upper tubular beam connector, a D-column middle tubular beam connector and a D-column lower tubular beam connector, wherein the D-column upper tubular beam connector, the D-column middle tubular beam connector and the D-column lower tubular beam connector are sequentially arranged towards the other end at intervals. The D-column tubular beam is made of high-strength steel, and a plurality of joints are aluminum casting pieces and are connected into a whole through a semi-solid casting process. The manufacturing method comprises the steps that the D-column tubular beam is placed into a mold cavity, aluminum alloy is heated to the semi-solid temperature range and injected into the mold cavity, cooling forming is conducted after pressurization and pressure maintaining are conducted, and finally all assemblies are connected. The structural strength and rigidity of the D column are improved, and the safety performance of a vehicle during rolling is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile structures, and in particular to a vehicle D-pillar structure and a manufacturing method thereof, and a vehicle. Background Art

[0002] With the development of society and the improvement of people's living standards, cars have become a necessity in modern life. Consumers' demand for cars is no longer limited to basic appearance and handling performance, and the number of off-road driving enthusiasts is growing. These car owners often drive in complex road conditions such as deserts, steep slopes, and mountain roads, so the risk of vehicle rollover is greatly increased, seriously threatening the safety of passengers in the car.

[0003] Especially in the field of new energy off-road vehicles, due to the weight of the power battery, the vehicle mass is significantly increased compared to traditional fuel vehicles. Once a rollover accident occurs, the larger vehicle mass will cause more serious deformation of the vehicle structure, further exacerbating safety hazards. The existing D-pillar structure often has the following problems:

[0004] 1. The structural strength is insufficient, which may easily cause significant deformation when the vehicle rolls over;

[0005] 2. There are many parts and the welding process is complicated, which is not conducive to improving production efficiency;

[0006] 3. The connection method between the D-pillar and other parts of the car body is single, which makes it difficult to ensure the overall performance of the structure. Summary of the invention

[0007] The purpose of the present invention is to provide a vehicle D-pillar structure and a manufacturing method thereof, and a vehicle, so as to solve the problem of insufficient vehicle body rigidity under harsh road conditions in the prior art, enhance the strength and rigidity of the D-pillar, improve the pressure resistance of the vehicle, reduce the deformation of the vehicle body structure during rollover, and protect the safety of the occupants.

[0008] To achieve the above-mentioned purpose, in a first aspect, the present invention provides a vehicle D-pillar structure, comprising: a rear pillar reinforcement plate assembly, a rear pillar inner plate assembly and a D-pillar tube beam assembly, wherein the D-pillar tube beam assembly is arranged between the rear pillar reinforcement plate assembly and the rear pillar inner plate assembly; the D-pillar tube beam assembly comprises a D-pillar tube beam extending in the longitudinal direction and a plurality of joints arranged at both ends of the D-pillar tube beam, wherein the plurality of joints comprises a C-pillar tube beam joint located at one end and a plurality of D-pillar tube beam joints arranged in sequence and spaced apart toward the other end; the D-pillar tube beam is connected to the rear pillar reinforcement plate assembly and the rear pillar inner plate assembly through the plurality of joints.

[0009] In some optional embodiments of the present invention, the D-pillar tube beam includes a D-pillar transverse portion and a D-pillar vertical portion; the multiple D-pillar tube beam joints include a D-pillar upper tube beam joint, a D-pillar middle tube beam joint and a D-pillar lower tube beam joint; the C-pillar tube beam joint is located at the end of the D-pillar transverse portion, the D-pillar upper tube beam joint is located in the middle of the D-pillar transverse portion, and the D-pillar middle tube beam joint and the D-pillar lower tube beam joint are respectively located at both ends of the D-pillar vertical portion.

[0010] In some optional embodiments of the present invention, the rear pillar reinforcement plate assembly includes a rear pillar upper reinforcement plate, a rear pillar upper support plate, a rear pillar inner support plate, and a D-pillar reinforcement plate lower section that are welded and connected in sequence; it also includes a combined lamp holder plate welded and connected to the rear pillar inner support plate and the D-pillar reinforcement plate lower section; the rear pillar upper reinforcement plate, the rear pillar upper support plate, the rear pillar inner support plate, the D-pillar reinforcement plate lower section, the combined lamp holder plate and the rear pillar inner plate assembly form a cavity for accommodating the D-pillar tube beam assembly, and are combined into a D-pillar structure.

[0011] Preferably, the upper reinforcement plate of the rear pillar, the upper support plate of the rear pillar and the inner support plate of the rear pillar are provided with welding holes for welding the D-pillar pipe beam plugs.

[0012] Preferably, the inner support plate of the rear pillar is provided with a through hole, and the fastener connects the inner support plate of the rear pillar to the tubular beam joint in the D-pillar through the through hole.

[0013] Preferably, the D-pillar tube beam is connected to the upper support plate of the rear pillar by double welding.

[0014] In some optional embodiments of the present invention, the rear pillar inner panel assembly includes a welded rear pillar inner panel and a top cover rear cross beam connecting plate, and a rear pillar inner panel angle plate welded to the rear pillar inner panel and the top cover rear cross beam connecting plate; it also includes a tailgate limiter installation reinforcement plate welded to the rear pillar inner panel angle plate; the rear pillar inner panel, the top cover rear cross beam connecting plate, the rear pillar inner panel angle plate, the tailgate limiter installation reinforcement plate and the rear pillar reinforcement plate assembly form a cavity for accommodating the D-pillar tube beam assembly, and are combined into a D-pillar structure.

[0015] Preferably, a rear pillar middle support plate is welded between the rear pillar inner plate angle plate and the tailgate limiter mounting reinforcement plate.

[0016] Preferably, the rear pillar inner plate is provided with a plurality of through holes, and the fasteners respectively connect the C-pillar tube beam joint and the D-pillar upper tube beam joint to the rear pillar inner plate through the through holes.

[0017] Preferably, the rear pillar inner panel angle plate is provided with a through hole, and the fastener connects the D-pillar lower tube beam to the rear pillar inner panel angle plate through the through hole.

[0018] In some optional embodiments of the present invention, the D-pillar tube beam is made of high-strength steel, and the multiple joints are cast aluminum parts; the D-pillar tube beam and the multiple joints are connected into a whole through a semi-solid casting process.

[0019] In a second aspect, the present invention provides a method for manufacturing a vehicle D-pillar structure, which is used to manufacture the vehicle D-pillar structure described in the first aspect, and the method comprises the following steps:

[0020] Placing the formed D-pillar tube beam in the mold cavity;

[0021] heating the aluminum alloy to a semi-solid temperature range;

[0022] injecting a semi-solid aluminum alloy into a mold cavity;

[0023] After pressurization and pressure maintenance, the tube is cooled and formed to form a D-pillar tube beam assembly;

[0024] The rear pillar reinforcement plate assembly and the rear pillar inner plate assembly are connected to each other by spot welding, and then connected to the D-pillar tube beam assembly to form a whole.

[0025] In some optional embodiments of the present invention, the rear pillar upper reinforcement plate, the rear pillar upper support plate and the rear pillar inner support plate are sequentially connected by spot welding;

[0026] Weld the lower section of the D-pillar reinforcement plate to the lower end of the rear pillar inner support plate;

[0027] Weld the combination lamp holder plate to the inner support plate of the rear pillar and the lower section of the D-pillar reinforcement plate.

[0028] In some optional embodiments of the present invention, the rear pillar inner plate is welded to the roof rear cross beam connecting plate;

[0029] Weld the rear pillar inner plate angle plate to the rear pillar inner plate and the roof rear cross beam connecting plate;

[0030] Weld the middle support plate of the rear pillar to the gusset plate of the inner plate of the rear pillar;

[0031] Weld the back door stopper installation reinforcement plate to the rear pillar inner panel angle plate.

[0032] In some optional embodiments of the present invention, the D-pillar tube beam assembly is placed in a cavity formed between the rear pillar reinforcement plate assembly and the rear pillar inner plate assembly;

[0033] Connecting the D-pillar tube beam to the rear pillar upper reinforcement plate, the rear pillar upper support plate and the rear pillar inner support plate by plug welding;

[0034] Connect the D-pillar tube beam to the upper support plate of the rear pillar by two weldings;

[0035] Connect the D-pillar middle tube beam joint to the rear pillar inner support plate through fasteners;

[0036] Connect the C-pillar tube beam joint and the D-pillar upper tube beam joint to the rear pillar inner plate through fasteners;

[0037] Connect the D-pillar lower tube beam joint to the rear pillar inner panel angle plate through fasteners.

[0038] In some optional embodiments of the present invention, the semi-solid temperature range is 570-590°C.

[0039] In a third aspect, the present invention provides a vehicle, comprising the vehicle D-pillar structure as described in the first aspect.

[0040] The present invention provides a vehicle D-pillar structure and a manufacturing method thereof, wherein a D-pillar tube beam assembly is arranged between a rear pillar reinforcement plate assembly and a rear pillar inner plate assembly, and a D-pillar tube beam made of high-strength steel is connected to a cast aluminum joint through a semi-solid casting process to form an integral whole, thereby achieving the following beneficial effects:

[0041] 1. The vehicle D-pillar structure provided by the present invention is provided with a tube beam structure and a connecting joint inside the D-pillar, wherein the D-pillar tube beam is made of high-strength steel material, and the connecting joint is made of cast aluminum structure, and the two are connected into a whole through a semi-solid casting process, which significantly improves the overall strength and rigidity of the D-pillar structure. This structural design not only enhances the pressure resistance of the rear part of the vehicle body, but also effectively reduces the deformation of the vehicle body when the vehicle rolls over, thereby better protecting the safety of the passengers in the vehicle.

[0042] 2. The D-pillar tube beam assembly of the present invention is connected to the rear pillar reinforcement plate assembly and the rear pillar inner plate assembly through multiple joints, and adopts a bolt connection method, which is convenient for installation, reduces the number of parts, simplifies the welding process, and improves production efficiency. In addition, this connection method is easy to repair and replace, reducing the cost of later maintenance.

[0043] 3. The semi-solid casting process adopted by the present invention heats the aluminum alloy to a semi-solid temperature range (570-590°C) and then injects it into the mold cavity, which can ensure a stable metallurgical bond between the aluminum alloy joint and the steel pipe beam, thereby improving the reliability and durability of the joint connection. This process not only improves production efficiency, but also ensures the stability of product quality.

[0044] 4. The D-pillar structural design of the present invention fully considers the characteristics of new energy vehicles. Aiming at the heavy weight of new energy vehicles, the layout and connection structure of the D-pillar tube beam are optimized to provide better load-bearing capacity and protection performance, which is particularly suitable for new energy off-road vehicles.

[0045] 5. The present invention accommodates the D-pillar tube beam assembly through the cavity formed by the rear pillar reinforcement plate assembly and the rear pillar inner plate assembly. This design not only ensures the compactness of the structure, but also provides sufficient installation space, facilitates the assembly and connection between the various components, and improves the coordination of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments disclosed in the present invention, the drawings of the embodiments will be briefly introduced below. These drawings are only used for illustrative purposes and are not intended to limit the protection scope of the present invention.

[0047] Figure 1 is a front schematic diagram of a vehicle D-pillar structure provided by an embodiment of the present invention;

[0048] Figure 2 It is a schematic diagram of the composition of a vehicle D-pillar structure provided by an embodiment of the present invention;

[0049] Figure 3 is a schematic diagram of a rear pillar reinforcement plate assembly of a vehicle D-pillar structure provided by an embodiment of the present invention;

[0050] Figure 4 Schematic diagram of a rear pillar inner panel assembly of a vehicle D-pillar structure provided by an embodiment of the present invention;

[0051] Figure 5 Schematic diagram of a D-pillar tube beam assembly of a vehicle D-pillar structure provided by an embodiment of the present invention;

[0052] Figure 6 Figure 1 AA section diagram in;

[0053] Figure 7 Figure 1 BB cross-section diagram in;

[0054] Figure 8 Figure 1 Schematic diagram of CC cross section;

[0055] Fig. 9 Figure 1 DD cross-section diagram in;

[0056] Fig.10 Figure 1 EE cross-sectional diagram in ;

[0057] In the figure: rear pillar reinforcement plate assembly 1; rear pillar inner plate assembly 2; D-pillar tube beam assembly 3; mounting bolt 4;

[0058] Rear pillar upper reinforcement plate 1-1; rear pillar upper support plate 1-2; rear pillar inner support plate 1-3; D-pillar reinforcement plate lower section 1-4; rear combination lamp holder plate 1-5; rear combination lamp holder plate supplement plate 1-6;

[0059] Rear pillar inner plate 2-1; roof rear crossbeam connecting plate 2-2; rear pillar inner plate angle plate 2-3; rear pillar middle support plate 2-4; back door stopper installation reinforcement plate 2-5;

[0060] D-pillar tube beam 3-1; C-pillar tube beam joint 3-2; D-pillar upper tube beam joint 3-3; D-pillar middle tube beam joint 3-4; D-pillar lower tube beam joint 3-5. DETAILED DESCRIPTION

[0061] The technical solution of the present invention (including the preferred technical solution) is further described in detail below by means of the accompanying drawings and by listing some optional embodiments of the present invention. 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 work are within the scope of protection of the present invention.

[0062] Example 1

[0063] like Figures 1 to 10 As shown, this embodiment provides a vehicle D-pillar structure, including a rear pillar reinforcement plate assembly 1, a rear pillar inner plate assembly 2 and a D-pillar tube beam assembly 3. The D-pillar tube beam assembly 3 is arranged in a cavity between the rear pillar reinforcement plate assembly 1 and the rear pillar inner plate assembly 2. Among them, the D-pillar tube beam assembly 3 includes a D-pillar tube beam 3-1 extending along the longitudinal direction of the vehicle body, and a plurality of joints arranged at both ends of the D-pillar tube beam 3-1. These joints include a C-pillar tube beam joint 3-2 located at one end of the D-pillar tube beam 3-1, and a D-pillar upper tube beam joint 3-3, a D-pillar middle tube beam joint 3-4 and a D-pillar lower tube beam joint 3-5 arranged in sequence toward the other end.

[0064] like Figure 3 As shown, the rear pillar reinforcement plate assembly 1 includes a plurality of parts welded in sequence:

[0065] Rear pillar upper reinforcement plate 1-1: located at the upper part of the D-pillar structure, providing top support.

[0066] Rear pillar upper support plate 1-2: connects the rear pillar upper reinforcement plate 1-1 and the rear pillar inner support plate 1-3 to enhance structural stability.

[0067] Rear pillar inner support plate 1-3: As the inner support component of the D-pillar structure, it is provided with a through hole for connecting with the D-pillar middle pipe beam joint 3-4 through fasteners.

[0068] The lower section 1-4 of the D-pillar reinforcement plate is welded to the lower end of the rear pillar inner support plate 1-3 and extends to the lower part of the D-pillar structure.

[0069] Combination lamp holder plate 1-5: welded to the rear pillar inner support plate 1-3 and the lower section of the D-pillar reinforcement plate 1-4, used for installing the rear combination lamp and also serving as a structural support.

[0070] Combination lamp holder plate supplementary plate 1-6: used to reinforce the combination lamp holder plate 1-5 to improve the connection strength.

[0071] The above components are connected by spot welding. The rear pillar upper reinforcement plate 1-1, the rear pillar upper support plate 1-2, and the rear pillar inner support plate 1-3 are provided with plug welding holes for welding the D-pillar pipe beam 3-1.

[0072] like Figure 4 As shown, the rear pillar inner panel assembly 2 includes multiple parts connected by welding:

[0073] Rear pillar inner plate 2-1: As the main load-bearing member on the inner side of the D-pillar structure, it is provided with a plurality of through holes, and fasteners connect the C-pillar tube beam joint 3-2 and the D-pillar upper tube beam joint 3-3 with the rear pillar inner plate 2-1 through these through holes.

[0074] Top cover rear cross beam connecting plate 2-2: welded to the top of the rear pillar inner plate 2-1, used to connect the vehicle top cover rear cross beam.

[0075] Rear pillar inner panel angle plate 2-3: welded between the rear pillar inner panel 2-1 and the roof rear cross beam connecting plate 2-2 to enhance the structural strength of the corner, with a through hole provided on it, through which the fastener connects the D-pillar lower tube beam joint 3-5 to the rear pillar inner panel angle plate 2-3.

[0076] The middle support plate 2-4 of the rear pillar is welded between the rear pillar inner plate angle plate 2-3 and the back door limiter installation reinforcement plate 2-5 to provide middle support.

[0077] Back door stopper installation reinforcement plate 2-5: used to install the back door stopper to enhance the structural strength of the back door area.

[0078] The above components are also connected by spot welding.

[0079] like Figure 5 As shown, the D-pillar tube beam assembly 3 includes:

[0080] D-pillar tube beam 3-1: Made of high-strength steel, including a D-pillar transverse portion and a D-pillar vertical portion, wherein the D-pillar transverse portion substantially extends along the transverse direction of the vehicle body, and the D-pillar vertical portion substantially extends along the vertical direction of the vehicle body. C-pillar tube beam joint 3-2 is located at the end of the D-pillar transverse portion, D-pillar upper tube beam joint 3-3 is located in the middle of the D-pillar transverse portion, and D-pillar middle tube beam joint 3-4 and D-pillar lower tube beam joint 3-5 are located at the upper end and lower end of the D-pillar vertical portion, respectively.

[0081] C-pillar tube beam joint 3-2: Located at the end of the D-pillar transverse portion of the D-pillar tube beam 3-1, it is a cast aluminum part, connected to the D-pillar tube beam 3-1 through a semi-solid casting process, and is provided with threaded holes for connection with the rear pillar inner panel 2-1 through fasteners.

[0082] D-pillar upper tube beam joint 3-3: located in the middle of the D-pillar transverse portion of the D-pillar tube beam 3-1, it is a cast aluminum part, integrally formed with the D-pillar tube beam 3-1, and is provided with threaded holes for connection with the rear pillar inner plate 2-1.

[0083] D-pillar middle tube beam joint 3-4: located at the upper end of the D-pillar vertical portion of the D-pillar tube beam 3-1, it is a cast aluminum part with threaded holes for connection with the rear pillar inner support plate 1-3.

[0084] D-pillar lower tube beam joint 3-5: located at the lower end of the D-pillar vertical portion of the D-pillar tube beam 3-1, it is a cast aluminum part with threaded holes for connection with the rear pillar inner plate angle plate 2-3.

[0085] The D-pillar tube beam 3-1 and the above-mentioned joint are connected into a whole through a semi-solid casting process, achieving a reliable connection between high-strength steel and aluminum alloy.

[0086] Connection between the D-pillar tube beam 3-1 and the rear pillar reinforcement plate assembly 1: Through the plug welding holes, the D-pillar tube beam 3-1 is welded to the rear pillar upper reinforcement plate 1-1, the rear pillar upper support plate 1-2, and the rear pillar inner support plate 1-3. At the same time, the D-pillar tube beam 3-1 is connected to the rear pillar upper support plate 1-2 through double welding to enhance the welding strength.

[0087] Connection between the D-pillar tube beam assembly 3 and the rear pillar inner panel assembly 2: the C-pillar tube beam joint 3-2 and the D-pillar upper tube beam joint 3-3 are respectively connected to the rear pillar inner panel 2-1 through fasteners; the D-pillar lower tube beam joint 3-5 is connected to the rear pillar inner panel angle plate 2-3.

[0088] The connection between the tube beam joint 3-4 in the D-pillar and the inner support plate 1-3 of the rear pillar is connected to the tube beam joint 3-4 in the D-pillar by fasteners passing through the through holes on the inner support plate 1-3 of the rear pillar.

[0089] The above connection method enables the D-pillar tube beam assembly 3 and the rear pillar reinforcement plate assembly 1 and the rear pillar inner plate assembly 2 to form an integral D-pillar structure, thereby improving the strength and rigidity of the D-pillar.

[0090] Example 2

[0091] This embodiment provides a method for manufacturing a vehicle D-pillar structure, which is used to manufacture the vehicle D-pillar structure described in Embodiment 1, and the specific steps are as follows:

[0092] First, the D-pillar tube beam 3-1 is processed by stamping, bending and other processes, and the surface is treated. At the same time, a mold is prepared, and the shape of the mold cavity is adapted to the shape of the final D-pillar tube beam assembly 3.

[0093] The formed D-pillar tube beam 3-1 is placed in the mold cavity; the aluminum alloy is heated to a semi-solid temperature range (about 570-590° C.); the semi-solid aluminum alloy is injected into the mold cavity at a certain speed and pressure, and the aluminum alloy is filled to both ends and a predetermined middle position of the D-pillar tube beam 3-1 to form a C-pillar tube beam joint 3-2, a D-pillar upper tube beam joint 3-3, a D-pillar middle tube beam joint 3-4 and a D-pillar lower tube beam joint 3-5;

[0094] After pressurization and pressure maintenance, it is cooled and formed, and the cast aluminum joint is connected to the D-pillar tube beam 3-1 as a whole to form a D-pillar tube beam assembly 3.

[0095] In some embodiments of the present invention, the prepared D-pillar tube beam 3-1 is placed at a specified position in the mold cavity. The AlSi7Mg aluminum alloy is heated to a semi-solid temperature range (570-590°C), at which time the alloy presents a "solid-liquid coexistence" state. The semi-solid aluminum alloy is then injected into the mold cavity at a speed of 15-20m / s, and the injection pressure is controlled at 80-100MPa. After the injection is completed, the pressure is increased immediately, the pressure is 100-120MPa, and the holding time is 10-15s. Finally, it is cooled to obtain the D-pillar tube beam assembly 3.

[0096] The rear pillar upper reinforcement plate 1-1, the rear pillar upper support plate 1-2 and the rear pillar inner support plate 1-3 are sequentially connected by spot welding. Then the D-pillar reinforcement plate lower section 1-4 is welded to the lower end of the rear pillar inner support plate 1-3. Finally, the rear combination lamp holder plate 1-5 is welded to the rear pillar inner support plate 1-3 and the D-pillar reinforcement plate lower section 1-4 to form the rear pillar reinforcement plate assembly 1.

[0097] Specifically, the upper reinforcement plate 1-1 of the rear pillar, the upper support plate 1-2 of the rear pillar and the inner support plate 1-3 of the rear pillar are connected by spot welding; the lower section 1-4 of the D-pillar reinforcement plate is welded to the lower end of the inner support plate 1-3 of the rear pillar; the combination lamp holder plate 1-5 is welded to the inner support plate 1-3 of the rear pillar and the lower section 1-4 of the D-pillar reinforcement plate, and if necessary, the combination lamp holder plate supplementary plate 1-6 is added for reinforcement.

[0098] First, the rear pillar inner panel 2-1 is welded to the roof rear cross beam connecting plate 2-2, and then the rear pillar inner panel angle plate 2-3 is welded to them. Then the rear pillar middle support plate 2-4 is welded to the rear pillar inner panel angle plate 2-3, and finally the back door stopper installation reinforcement plate 2-5 is welded in place to form the rear pillar inner panel assembly 2.

[0099] Specifically, weld the rear pillar inner panel 2-1 and the top cover rear cross beam connecting plate 2-2; weld the rear pillar inner panel angle plate 2-3 to the rear pillar inner panel 2-1 and the top cover rear cross beam connecting plate 2-2 respectively; weld the rear pillar middle support plate 2-4 between the rear pillar inner panel angle plate 2-3 and the tailgate limiter mounting reinforcement plate 2-5 to provide middle support; weld the tailgate limiter mounting reinforcement plate 2-5 to the rear pillar inner panel angle plate 2-3.

[0100] Place the D-pillar tube beam assembly 3 in the cavity formed between the rear pillar reinforcement plate assembly 1 and the rear pillar inner plate assembly 2, and connect the D-pillar tube beam 3-1 to the rear pillar upper reinforcement plate 1-1, the rear pillar upper support plate 1-2 and the rear pillar inner support plate 1-3 by plug welding. At the same time, connect the D-pillar tube beam 3-1 to the rear pillar upper support plate 1-2 by double welding. Then use bolts to connect each joint to the corresponding plate: the D-pillar middle tube beam joint 3-4 is connected to the rear pillar inner support plate 1-3, the C-pillar tube beam joint 3-2 and the D-pillar upper tube beam joint 3-3 are connected to the rear pillar inner plate 2-1, and the D-pillar lower tube beam joint 3-5 is connected to the rear pillar inner plate angle plate 2-3. The strength grade of the bolts used is not less than 10.9.

[0101] Assembly of the assembly:

[0102] 1. Place the D-pillar tube beam assembly 3 in the cavity formed between the rear pillar reinforcement plate assembly 1 and the rear pillar inner plate assembly 2.

[0103] 2. Connect the D-pillar tube beam 3-1 to the rear pillar upper reinforcement plate 1-1, the rear pillar upper support plate 1-2 and the rear pillar inner support plate 1-3 by plug welding.

[0104] 3. Connect the D-pillar tube beam 3-1 and the rear pillar upper support plate 1-2 through double welding to enhance the welding strength.

[0105] 4. Connect the tube beam joint 3-4 in the D-pillar to the inner support plate 1-3 of the rear pillar through fasteners. The fasteners pass through the through holes on the inner support plate 1-3 of the rear pillar and are screwed to the threaded holes on the tube beam joint 3-4 in the D-pillar.

[0106] 5. Connect the C-pillar tube beam joint 3-2 and the D-pillar upper tube beam joint 3-3 to the rear pillar inner plate 2-1 through fasteners. The fasteners pass through the through holes on the rear pillar inner plate 2-1 and are screwed to the threaded holes on the joints respectively.

[0107] 6. Connect the D-pillar lower tube beam joint 3-5 to the rear pillar inner plate angle plate 2-3 through fasteners. The fasteners pass through the through holes on the rear pillar inner plate angle plate 2-3 and are screwed to the threaded holes on the joint.

[0108] Integration with other vehicle parts: The assembled D-pillar structure is welded to the side panel and other body parts to form a complete side panel assembly. Finally, it is assembled with the vehicle as a whole to complete the manufacturing of the vehicle's D-pillar structure.

[0109] Example 3

[0110] This embodiment provides a vehicle using the above-mentioned D-pillar structure. The vehicle can be a traditional fuel vehicle or a new energy vehicle. In particular, when applied to a new energy vehicle, since the weight of the new energy vehicle is relatively large, the D-pillar structure of the present invention can provide better anti-rollover protection.

[0111] In practical applications, the D-pillar structure of the present invention can be appropriately adjusted according to the specific requirements of different models. For example, the strength requirements of different models can be met by changing the wall thickness of the D-pillar tube beam, adjusting the size of the joint, etc. At the same time, the appearance can be appropriately modified according to the styling requirements of the entire vehicle while ensuring that the basic structure remains unchanged.

[0112] The D-pillar tube beam of the present invention runs through the rear pillar reinforcement plate assembly and the rear pillar inner plate assembly, and is connected thereto through a plurality of joints, forming a continuous load-bearing structure, which greatly improves the strength and rigidity of the D-pillar and enhances the vehicle's ability to resist compression in extreme situations such as rollover. The combination of high-strength steel and cast aluminum parts not only ensures the strength of the structure, but also achieves the purpose of lightweight, which helps to reduce the overall weight of the vehicle and improve fuel economy or endurance. The enhanced D-pillar structure can effectively resist body deformation, protect the integrity of the passenger compartment, and enhance the safety of the occupants when the vehicle rolls over or rolls. The integral connection between the D-pillar tube beam and the joint is achieved through a semi-solid casting process, which reduces the number of parts, simplifies the welding and assembly processes, improves production efficiency, and reduces manufacturing costs. The joint is connected to the rear pillar reinforcement plate assembly and the rear pillar inner plate assembly through fasteners, which facilitates subsequent maintenance and replacement and improves the maintainability of the vehicle.

[0113] Those skilled in the art will readily appreciate that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, replacements, improvements, etc. made within the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. A vehicle D-pillar structure, characterized in that: include: A rear pillar reinforcement plate assembly, a rear pillar inner plate assembly and a D-pillar tube beam assembly, wherein the D-pillar tube beam assembly is disposed between the rear pillar reinforcement plate assembly and the rear pillar inner plate assembly; The D-pillar tube beam assembly includes a D-pillar tube beam extending in the longitudinal direction and a plurality of joints arranged at both ends of the D-pillar tube beam, wherein the plurality of joints include a C-pillar tube beam joint located at one end and a plurality of D-pillar tube beam joints arranged in sequence and spaced apart toward the other end; The D-pillar tube beam is connected to the rear pillar reinforcement plate assembly and the rear pillar inner plate assembly through the multiple joints.

2. The vehicle D-pillar structure according to claim 1, characterized in that: The D-pillar tube beam includes a D-pillar transverse portion and a D-pillar vertical portion; The plurality of D-tube beam joints include a D-pillar upper tube beam joint, a D-pillar middle tube beam joint and a D-pillar lower tube beam joint; The C-pillar tube beam joint is located at the end of the D-pillar transverse portion, the D-pillar upper tube beam joint is located in the middle of the D-pillar transverse portion, and the D-pillar middle tube beam joint and the D-pillar lower tube beam joint are respectively located at both ends of the D-pillar vertical portion.

3. The vehicle D-pillar structure according to claim 1 or 2, characterized in that: The rear pillar reinforcement plate assembly comprises: The rear pillar upper reinforcement plate, the rear pillar upper support plate, the rear pillar inner support plate, and the lower section of the D-pillar reinforcement plate are welded and connected in sequence; and A combined lamp holder plate welded to the rear pillar inner support plate and the lower section of the D-pillar reinforcement plate; The rear pillar upper reinforcement plate, the rear pillar upper support plate, the rear pillar inner support plate, the lower section of the D-pillar reinforcement plate, the combined lamp holder plate and the rear pillar inner plate assembly form a cavity for accommodating the D-pillar tube beam assembly and are combined into a D-pillar structure.

4. The vehicle D-pillar structure according to claim 3, characterized in that: The upper reinforcement plate of the rear pillar, the upper support plate of the rear pillar, and the inner support plate of the rear pillar are provided with plug welding holes for welding the D-pillar tube beam; The inner support plate of the rear pillar is provided with a through hole, and the fastener connects the inner support plate of the rear pillar to the pipe beam joint in the D-pillar through the through hole; The D-pillar tube beam is connected to the upper support plate of the rear pillar by double welding.

5. The vehicle D-pillar structure according to claim 1 or 2, characterized in that: The rear pillar inner panel assembly comprises: A rear pillar inner plate and a roof rear cross beam connecting plate connected by welding, and a rear pillar inner plate angle plate connected by welding to the rear pillar inner plate and the roof rear cross beam connecting plate; The back door stopper installation reinforcement plate is welded to the rear pillar inner plate angle plate; The rear pillar inner plate, the roof rear cross beam connecting plate, the rear pillar inner plate angle plate, the back door limiter installation reinforcement plate and the rear pillar reinforcement plate assembly form a cavity for accommodating the D-pillar tube beam assembly and are combined into a D-pillar structure.

6. The vehicle D-pillar structure according to claim 5, characterized in that: A rear pillar middle support plate is provided between the rear pillar inner plate angle plate and the back door stopper installation reinforcement plate; The rear pillar inner plate is provided with a plurality of through holes, and the fasteners respectively connect the C-pillar tube beam joint and the D-pillar upper tube beam joint to the rear pillar inner plate through the plurality of through holes; The rear pillar inner plate angle plate is provided with a through hole, and the fastener connects the D-pillar lower tube beam joint with the rear pillar inner plate angle plate through the through hole.

7. The vehicle D-pillar structure according to claim 1, characterized in that: The D-pillar tube beam is made of high-strength steel, and the multiple joints are cast aluminum parts; The D-pillar tube beam and the plurality of joints are connected into an integral whole through a semi-solid casting process.

8. A method for manufacturing a vehicle D-pillar structure, used for manufacturing the vehicle D-pillar structure according to any one of claims 1 to 7, characterized in that: The following steps are involved: Placing the formed D-pillar tube beam in the mold cavity; heating the aluminum alloy to a semi-solid temperature range; injecting a semi-solid aluminum alloy into a mold cavity; After pressurization and pressure maintenance, the tube is cooled and formed to form a D-pillar tube beam assembly; The rear pillar reinforcement plate assembly and the rear pillar inner plate assembly are connected to each other by spot welding, and then connected to the D-pillar tube beam assembly to form a whole.

9. The manufacturing method according to claim 8, characterized in that: The semi-solid temperature range is 570-590°C.

10. A vehicle, characterized in that: The vehicle D-pillar structure comprises the vehicle D-pillar structure as claimed in any one of claims 1 to 7.

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