Vehicle and its subframe

Abstract

This application relates to a vehicle and its subframe, wherein the subframe includes: a frame body comprising a plurality of fixedly connected splice bodies; wherein two adjacent splice bodies are joined in a first direction and have a cross-sectional splice line extending at least along a second direction; the first direction and the second direction intersect; the splice bodies have different dimensions along the second direction at different locations in the first direction. The beneficial effect of this application is that it balances the lightweight and strength of the frame through the splicing of the splice bodies in the first direction and the differentiated design of the splice bodies in the second direction.

Description

Technical Field

[0001] This application relates to the field of vehicle frame forming technology, and more particularly to a vehicle and its subframe. Background Technology

[0002] As a crucial structure for bearing loads in a vehicle, the chassis often requires high strength, while simultaneously, for economic reasons, lightweight chassis is often desired.

[0003] In related technologies, the frame is often formed by stamping and welding multiple blanks to create a hollow structure, thereby ensuring the strength of the frame while reducing its weight.

[0004] However, in related technologies, the splicing method between blanks often causes unnecessary weight increase, thus deviating from the purpose of lightweighting the frame; while simply reducing the amount of material used in the frame as a whole will affect the strength of the frame. Summary of the Invention

[0005] This application provides a vehicle and its subframe, which improves the safety of the subframe and at least partially solves the above-mentioned technical problems.

[0006] To achieve the above objectives, according to a first aspect of this application, a subframe is provided, comprising:

[0007] The frame consists of multiple fixedly connected assembly parts;

[0008] Wherein, two adjacent splicing bodies form a splice in a first direction and have a cross-sectional splicing line extending at least along a second direction; the first direction and the second direction intersect;

[0009] The splice body has different dimensions along the second direction at different locations in the first direction.

[0010] Optionally, in some embodiments of this application, the dimensions of different parts of the splice body along the second direction are the dimensions of the second direction; the splicing is welding, and the splice bodies are fixedly connected by the welding; the second direction dimension of the end of the splice body in the first direction is smaller than the maximum second direction dimension of the splice body.

[0011] Optionally, in some embodiments of this application, the second-direction dimension of the end of the splice body in the first direction is greater than the minimum second-direction dimension of the splice body and less than the maximum second-direction dimension of the splice body.

[0012] Optionally, in some embodiments of this application, the dimensions of different parts of the splice body along the second direction are the dimensions of the second direction;

[0013] The two ends of the two adjacent splicing bodies have different dimensions in the second direction.

[0014] Optionally, in some embodiments of this application, the dimensions of different parts of the splice body along the second direction are the dimensions of the second direction;

[0015] The splice body has different dimensions in a second direction at its two ends in the first direction.

[0016] Optionally, in some embodiments of this application, the dimensions of different parts of the splice body along the second direction are the dimensions of the second direction;

[0017] The position of the maximum second-direction dimension of the splice body is set between the two ends of the splice body in the first direction.

[0018] Optionally, in some embodiments of this application, the dimensions of different parts of the splice body along the second direction are the dimensions of the second direction;

[0019] The splicing body includes a splicing structure whose dimensions gradually change in the second direction.

[0020] Optionally, in some embodiments of this application, the splice body is configured to be composed of differential thickness plates.

[0021] Optionally, in some embodiments of this application, the blank of the splice body before stamping is composed of a plate of varying thickness.

[0022] Optionally, in some embodiments of this application, the splicing elements in the frame are all formed by a single stamping process.

[0023] Optionally, in some embodiments of this application, two adjacent splice bodies are interlocked.

[0024] Optionally, in some embodiments of this application, the cross-sectional splicing line includes: a straight segment or a curved segment.

[0025] Optionally, in some embodiments of this application, the curve of the cross-sectional splicing line includes a circular arc curve.

[0026] Optionally, in some embodiments of this application, the shape formed by the straight segments of the cross-sectional splicing line includes at least one of trapezoid, triangle and rectangle.

[0027] Optionally, in some embodiments of this application, at least a portion of the straight line segment is perpendicular to the first direction.

[0028] Optionally, in some embodiments of this application, at least a portion of the straight line segment is parallel to the second direction.

[0029] Optionally, in some embodiments of this application, the curved segment is disposed between two straight segments.

[0030] Optionally, in some embodiments of this application, the cross-sectional splicing line of two adjacent splice bodies extends along a second direction.

[0031] Optionally, in some embodiments of this application, the cross-sectional splicing line is inclined or perpendicular to the first direction; or, the cross-sectional splicing line is inclined to the second direction.

[0032] Optionally, in some embodiments of this application, the plurality of fixedly connected splicing bodies include at least two splicing bodies with different materials.

[0033] Optionally, in some embodiments of this application, the plurality of fixedly connected splice bodies include at least two splice bodies with different maximum thicknesses.

[0034] Optionally, in some embodiments of this application, the plurality of fixedly connected splice bodies include at least two splice bodies with different minimum thicknesses.

[0035] Optionally, in some embodiments of this application, the number of splicing elements in the frame is greater than or equal to 3.

[0036] Optionally, in some embodiments of this application, the splicing elements in the frame are all formed by a single stamping process.

[0037] Optionally, in some embodiments of this application, the subframe includes two frames disposed opposite to each other.

[0038] Optionally, in some embodiments of this application, the splicing body of one of the two opposing frames is configured to correspond to the splicing body of the other frame.

[0039] Optionally, in some embodiments of this application, the frame is divided into:

[0040] The crossbeam area is the crossbeam used to form the subframe;

[0041] The longitudinal beam area, which consists of the longitudinal beams that form the subframe;

[0042] At least one of the crossbeam region and the longitudinal beam region includes a plurality of the splice bodies.

[0043] Optionally, in some embodiments of this application, one of the splices constitutes at least a portion of the crossbeam region or the longitudinal beam region.

[0044] Optionally, in some embodiments of this application, the beam region is formed by one of the splice bodies.

[0045] Optionally, in some embodiments of this application, the subframe further includes: a suspension mounting structure, a suspension mounting structure, and a body mounting structure;

[0046] The suspension mounting structure, the suspension mounting structure, and the vehicle body mounting structure are all installed to the frame; at least two of the suspension mounting structure, the suspension mounting structure, and the vehicle body mounting structure are fixedly connected to two different splicing bodies.

[0047] Optionally, in some embodiments of this application, the plurality of fixedly connected splice bodies includes two splice bodies that are fixedly connected by welding.

[0048] Optionally, in some embodiments of this application, the second direction is the thickness direction of the splice body.

[0049] According to a second aspect of this application, a vehicle is also provided, including the aforementioned subframe.

[0050] The beneficial effect of this application is that it balances the lightweight and strength of the frame by splicing the splice in the first direction and the differentiated design of the splice in the second direction.

[0051] More specifically, some embodiments of this application may produce the following specific beneficial effects:

[0052] By improving the splicing method, the material redundancy in the second direction during splicing is reduced, while the spliced ​​body has dimensional changes in the second direction, so that when the spliced ​​body is used to form a frame, both the material usage and structural strength in the second direction can be taken into account.

[0053] By using smaller structural dimensions at the weld joints, welding becomes easier, and the weight reduction benefits from welding can be converted into structural reinforcement of the joints where needed, avoiding the previous problem that weld joints could not serve as load-bearing parts and required redundant materials.

[0054] This allows the spliced ​​components to achieve both the strength of the fixed connection and the effect of reducing weight through internal overlapping.

[0055] By using a one-piece stamping method for the spliced ​​parts, the production efficiency can be significantly improved.

[0056] By combining the splicing components, the thickness and materials of the splicing components can be configured to meet the specific needs of each area, thereby achieving targeted reinforcement of the frame.

[0057] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0058] 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 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.

[0059] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0060] Figure 1 This is a schematic diagram of the overall structure of the subframe provided in an exemplary embodiment of this application;

[0061] Figure 2 This is a schematic diagram of the structure of the upper plate provided in an exemplary embodiment of this application;

[0062] Figure 3 This is a top view of the upper plate structure provided in an exemplary embodiment of this application;

[0063] Figure 4 This is a schematic diagram of a structure in an exemplary embodiment of this application, showing that the upper and lower plates are joined by laser splicing.

[0064] Figure 5 This is a schematic diagram of the lap joint structure between the upper and lower plates using conventional gas shielded welding in related technologies;

[0065] Figure 6 This is a partial top view of the upper plate provided in an exemplary embodiment of this application;

[0066] Figure 7 This is a cross-sectional structural diagram of the upper plate provided in an exemplary embodiment of this application;

[0067] Figure 8 This is a schematic diagram of the upper plate using the first type of blank partitioning provided in an exemplary embodiment of this application;

[0068] Figure 9 This is a schematic diagram of the upper plate using a second type of blank partitioning provided in an exemplary embodiment of this application;

[0069] Figure 10 This is a schematic diagram of the first method of splicing line between splicing areas provided in the exemplary embodiments of this application;

[0070] Figure 11 This is a schematic diagram of the second method of splicing line between splicing areas provided in the exemplary embodiments of this application;

[0071] Figure 12This is a schematic diagram of a third method for splicing lines between splicing areas provided in an exemplary embodiment of this application;

[0072] Figure 13 This is a schematic diagram of the upper and lower plates using a first welding method provided in an exemplary embodiment of this application;

[0073] Figure 14 This is a schematic diagram illustrating the second welding method used between the upper and lower plates in an exemplary embodiment of this application.

[0074] Figure 15 This is a schematic diagram of the subframe plate thickness distribution provided in an exemplary embodiment of this application;

[0075] Figure 16 yes Figure 15 A schematic diagram of the first part of the subframe shown;

[0076] Figure 17 yes Figure 16 Schematic diagram of the BB section;

[0077] Figure 18 yes Figure 15 A schematic diagram of the second part of the subframe shown;

[0078] Figure 19 yes Figure 18 A schematic diagram of the C-section;

[0079] Figure 20 This is another schematic diagram of a subframe provided in an exemplary embodiment of this application;

[0080] Figure 21 yes Figure 20 A schematic diagram of a portion of the subframe shown;

[0081] Figure 22 yes Figure 21 Schematic diagram of the DD section;

[0082] Figure 23 This is a schematic diagram of a vehicle provided in an exemplary embodiment of this application.

[0083] Explanation of reference numerals in the attached figures:

[0084] 1. Vehicle; 10. Subframe; 100. Upper plate; 101. Assembly; 102. Suspension mounting structure; 103. Suspension mounting structure; 104. Body mounting structure; 105. Sectional splicing line; 200. Lower plate; 20. Space between plates; D1. First direction; D2. Second direction. Detailed Implementation

[0085] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0086] Reference Figures 1 to 22 As shown, this application provides a subframe 10, including: an upper plate 100 and a lower plate 200. The upper plate 100 can be used as one frame in this application; while the lower plate 200 can be used as another frame in this application.

[0087] Specifically, the subframe 10 includes an upper plate 100 disposed on a relatively upper side and a lower plate 200 disposed on a relatively lower side. The terms "relatively upper side" and "relatively lower side" are used to schematically describe the relative positional relationship between the upper plate 100 and the lower plate 200, and are not intended to limit the actual positions of the two plates. The upper plate 100 and the lower plate 200 are joined together to form a subframe 10.

[0088] Reference Figure 4 , Figure 10 as well as Figure 11 As shown, the upper plate 100 serves as a frame, comprising multiple fixedly connected splice bodies 101; wherein two adjacent splice bodies 101 form a splice in a first direction D1 and have a cross-sectional splice line 105 extending at least along a second direction D2. Specifically, the cross-sectional splice line 105 extends at least along the second direction D2 within the cross-section containing the first direction D1 and the second direction D2.

[0089] This will avoid Figure 5 In the scheme shown, there is an overlap in the first direction D1, which increases the weight unnecessarily.

[0090] Reference Figure 4 As shown, in a specific embodiment, two adjacent splicing bodies 101 only have a cross-sectional splicing line 105 extending along the second direction D2. That is, the two adjacent splicing bodies 101 are directly joined together using straight ends. More specifically, the cross-sectional splicing line 105 intersects the first direction D1 obliquely or perpendicularly; the cross-sectional splicing line 105 intersects the second direction D2 obliquely.

[0091] Reference Figure 10 and Figure 11 As shown, as a specific embodiment, two adjacent splicing bodies 101 form an overlapping arrangement located inside each other in the first direction D1.

[0092] Different from Figure 5In the scheme shown, the overlapping structure of the two splicing bodies 101 in the first direction D1 is set inside the second direction D2. This does not increase the thickness of the joint or the mass of the corresponding part, thus reducing the use of blanks while ensuring strength.

[0093] More specifically, refer to Figure 10 as well as Figure 11 As shown, the cross-sectional splicing line 105 includes: a straight line segment or a curved segment.

[0094] In some embodiments of this application, the curve of the cross-sectional splicing line 105 includes an arc curve.

[0095] In some embodiments of this application, the shape formed by the straight segments of the cross-sectional splicing line 105 includes at least one of trapezoid, triangle and rectangle.

[0096] In some embodiments of this application, at least a portion of the straight line segment is perpendicular to the first direction D1.

[0097] In some embodiments of this application, at least a portion of the straight line segment is parallel to the second direction D2.

[0098] In some embodiments of this application, the curved segment is positioned between two straight segment.

[0099] Reference Figure 4 , Figure 10 as well as Figure 11 As shown, the upper plate 100 is a frame that includes a plurality of fixedly connected splicing bodies; wherein two adjacent splicing bodies form a splice in a first direction and have a cross-sectional splicing line 105 extending at least along a second direction, and the first direction and the second direction intersect.

[0100] This will avoid Figure 5 In the scheme shown, there is an overlap in the first direction, which increases unnecessary weight.

[0101] Reference Figure 4 As shown, in a specific embodiment, two adjacent splicing bodies only have a cross-sectional splicing line extending along the second direction. That is, the two adjacent splicing bodies are directly joined together using straight ends. More specifically, the cross-sectional splicing line is inclined to either the first or second direction.

[0102] Reference Figure 10 and Figure 11 As shown, as a specific scheme, two adjacent splicing bodies form an overlapping arrangement located inside each other in the first direction.

[0103] Different from Figure 5The scheme shown has the two splicing bodies overlapping in the first direction, both of which are located inside the second direction. This does not increase the thickness of the joint or the mass of the corresponding part, thus reducing the amount of blank used while ensuring strength.

[0104] More specifically, refer to Figure 10 as well as Figure 11 As shown, the cross-sectional splicing line includes: straight line segment or curved segment.

[0105] In some embodiments of this application, the curve of the cross-sectional splicing line includes a circular arc curve.

[0106] In some embodiments of this application, the shape formed by the straight segments of the cross-sectional splicing line includes at least one of trapezoid, triangle and rectangle.

[0107] In some embodiments of this application, at least a portion of the straight line segment is perpendicular to the first direction.

[0108] In some embodiments of this application, at least a portion of the straight line segment is parallel to the second direction.

[0109] In some embodiments of this application, the curved segment is positioned between two straight segment.

[0110] Among them, reference Figures 2 to 9 As shown, the upper plate 100 or the lower plate 200 has multiple splicing bodies 101; the following is an illustrative description of the multiple splicing bodies on the upper plate.

[0111] The two splicing bodies 101 are fixedly connected by laser welding. That is, multiple splicing bodies 101 are connected into a whole by laser welding at least once.

[0112] By adopting the above solution, laser splicing welding can effectively avoid the overlapping surfaces between different splices, thereby saving materials at the overlapping positions. While reducing material usage, it can also improve the overall weight of the frame, and at the same time avoid dimensional errors caused by welding springback.

[0113] The upper plate 100 and the lower plate 200 are fixedly connected by welding, but other welding methods can also be used to form a fixed connection.

[0114] In some embodiments, the number of splicing bodies 101 is greater than or equal to 3, that is, the upper plate 100 or the lower plate 200 can be configured with a corresponding number of splicing bodies 101 according to different partitioning methods.

[0115] For example, depending on the connection position with the vehicle's suspension, body, and other parts, different connection positions can be set on different splicing bodies to rationally arrange the connection relationship between the subframe and other parts of the vehicle. This also makes it easier to configure the material, thickness, and other parameters of the corresponding splicing body 101 relatively independently according to the structural strength required for the connection position between the subframe and different parts of the vehicle, so as to meet the usage requirements.

[0116] In some embodiments, the different splice bodies 101 have different materials. That is, for at least two different splice bodies 101, the strength requirements of different areas of the subframe can be adapted by the difference in the material of the splice bodies 101. For example, a higher strength material is configured in areas of the subframe that bear high loads (such as the mounting position of the suspension) and a lower strength material is configured in areas that bear relatively low loads, so as to control the overall cost or weight of the subframe.

[0117] In some embodiments, different splice bodies 101 have different thicknesses. That is, for at least two different splice bodies 101, the strength requirements of different areas of the subframe 10 can be adapted by the difference in the material of the splice bodies 101. For example, a larger thickness is configured in areas where the subframe 10 bears high loads (such as the mounting position of the suspension) and a smaller thickness is configured in areas where the load is relatively low, so as to control the overall cost or weight of the subframe 10.

[0118] In some embodiments, the splice body 101 of the upper plate 100 and the splice body 101 of the lower plate 200 are respectively provided so that the upper plate 100 and the lower plate 200 are welded into a whole by laser welding.

[0119] In some embodiments, depending on the usage requirements, the splicing blank constituting the splicing body 101 has an irregular shape or a rectangular shape. This application does not limit the specific form of the splicing body. For example, the splicing blank may have protrusions, grooves, etc. formed on the rectangular cross-section of the whole, so that the cross-section of the splicing blank is an irregular shape that is different from the rectangular shape.

[0120] like Figures 2 to 4 As shown, the upper plate 100 has multiple splice bodies 101, and the splice bodies 101 are not connected by a joint. Figure 5 The welding is performed by overlapping, that is, instead of using traditional carbon dioxide gas shielded welding, laser welding is used to directly connect the two splicing bodies 101 to form a fixed connection.

[0121] During the stamping process, the blanks of multiple splicing bodies 101 are first spliced ​​together by laser welding, and then the two splicing bodies 101 are formed in one stamping. That is, the blanks of the two splicing bodies 101 are welded together and then formed into two splicing bodies 101 by one stamping.

[0122] In a specific implementation plan, all splice bodies 101 of the upper plate 100 or the lower plate 200 are formed by a single stamping process.

[0123] In some embodiments, the two splices produced by the same stamping process have different maximum sheet thicknesses.

[0124] Reference Figure 4 and Figure 5 As shown, by adopting the above solution, it is clear that reducing the overlap area reduces material usage and weight, and laser welding can effectively ensure the dimensional requirements of the joints. In this way, during the manufacturing process of the frame from raw material to finished product, the amount of material used to meet strength requirements can be reduced, effectively improving the material utilization rate of the raw material. Furthermore, while meeting strength requirements, effectively reducing the weight of the frame contributes to achieving frame lightweighting.

[0125] Reference Figure 6 and Figure 7 As shown, at least one splice 101 in the upper plate 100 is a differential thickness plate. That is, the thickness can also be designed within a splice 101, so that it is thickened where needed to ensure strength, while the rest of the part adopts a thinner structure to reduce weight.

[0126] Of course, in the upper plate 100, only some of the splicing bodies 101 can be formed by welding blanks together in one stamping. The other part of the splicing bodies 101 can be spliced ​​by welding after forming.

[0127] Reference Figure 8 As shown, the blank of the splice body 101 can be a regular rectangle to eliminate the blanking process for each area. Alternatively, the two splice bodies 101 produced by the same stamping can have different minimum sheet thicknesses. Alternatively, the two splice bodies 101 produced by the same stamping can have different sheet thicknesses at the welding point. Of course, all three of the above can be combined.

[0128] Reference Figure 9 As shown, the blank of the splice body 101 can be an irregular shape that is relatively consistent with the shape of the splice body 101 after molding, as long as the splice joint can be laser welded in a straight line.

[0129] As a specific solution, all the splicing bodies 101 in the upper plate 100 can be formed into splicing bodies 101 by stamping all the blanks in one go after the blanks are welded into a whole. As an optional solution, stamping can also be performed in stages, so that each stamping only forms a part of the blanks into splicing bodies 101.

[0130] Reference Figures 10 to 12As shown, in some embodiments, the end faces of two splicing bodies 101 abut to form a cross-sectional splicing line 105; the cross-sectional splicing line 105 includes: a straight line or a curve.

[0131] In some embodiments, the end faces of the two splicing bodies 101 form an embedding structure for one splicing body 101 to be embedded into the other splicing body 101. For example Figure 11 The trapezoidal embedding and Figure 12 The circular arc-shaped embedding shown not only maintains the strength of the joint but also reduces the welding area and the heat-affected zone.

[0132] That is, two adjacent splice bodies 101 are embedded into each other.

[0133] Reference Figure 13 and Figure 14 As shown, in some embodiments, the subframe 10 has two opposing upper plates 100 and lower plates 200; the upper plates 100 and lower plates 200 are fixedly connected by welding. In some embodiments, an inter-plate space 20 is formed between the upper plates 100 and 200. The welding between the upper plates 100 and lower plates 200 can be achieved by... Figure 13 The laser welding shown can also be performed using gas shielded welding with overlapping areas.

[0134] Reference Figures 1 to 14 As shown, in some embodiments, the two laser-welded joints 101 in the upper plate 100 have different maximum plate thicknesses. The two laser-welded joints 101 in the upper plate 100 have different minimum plate thicknesses. The two laser-welded joints 101 in the upper plate 100 have different plate thicknesses at the laser welding point.

[0135] Reference Figure 7 As shown, a splice 101 can have a continuous thickness variation, which facilitates stamping and forming.

[0136] Reference Figures 1 to 14 As shown, the entire subframe 10 can be divided into eight regions (corresponding to eight splice bodies 101) according to the stress, fatigue durability and assembly requirements of the subframe 10. Each region is set with different material thickness and different strength according to the requirements. The blanks of each region are connected into a whole by laser welding.

[0137] Reference Figures 1 to 14As shown, in some embodiments, the upper plate 100 includes a crossbeam region and a longitudinal beam region. The crossbeam region forms the crossbeams of the subframe 10; the longitudinal beam region forms the longitudinal beams of the subframe 10; wherein at least one of the crossbeam region and the longitudinal beam region of the upper plate 100 is composed of two laser-welded splice bodies 101. At least one splice body 101 in the upper plate 100 is fixedly connected to both the splice body 101 in the crossbeam region and the splice body 101 in the longitudinal beam region. The crossbeam region of the upper plate 100 is composed of only one splice body 101.

[0138] In some embodiments, at least one of the crossbeam region and the longitudinal beam region of the upper plate 100 is made of two splice bodies 101 formed by the same stamping. At least one splice body 101 is formed by the same stamping as the splice body 101 in the crossbeam region and the splice body 101 in the longitudinal beam region.

[0139] Specifically, a splice constitutes at least a portion of the crossbeam region or the longitudinal beam region.

[0140] Reference Figures 1 to 14 As shown, in some embodiments, the subframe 10 further includes: a suspension mounting structure 102, a suspension mounting structure 103, and a body mounting structure 104.

[0141] At least two of the suspension mounting structure 102, suspension mounting structure 103, and body mounting structure 104 are fixedly connected to two different splice bodies 101 in an upper plate 100. As a specific embodiment, the suspension mounting structure 102 is configured as a suspension bracket, the suspension mounting structure 103 is configured as a swing arm mounting nut, and the body mounting structure 104 is configured as a bushing or mounting sleeve, etc.

[0142] In some embodiments, at least two splice bodies 101 in the upper plate 100 are made of different materials. In particular, two splice bodies 101 formed in the same stamping process are made of different materials, for example, one splice body 101 is made of a relatively high-strength material and the other splice body 101 is made of a relatively low-strength material. Thus, the splice body 101 made of the higher-strength material can be used to connect and install vehicle components, while the splice body 101 made of the lower-strength material can reduce the overall cost of the frame.

[0143] Based on the technical solution of this application, when designing the subframe 10, the conversion status of each mounting point can be optimized to make the overall undulation of the sheet metal surface of the subframe 10 as smooth and continuous as possible. This allows the main body of the subframe 10 to be designed as two parts: an upper plate and a lower plate. The upper / lower plate can then be formed by stamping from a single sheet of material in one operation, effectively improving production efficiency. Furthermore, to effectively reduce the weight of the subframe 10 and lower material costs, the upper / lower plate can be divided into multiple areas. Each area can be configured with different material thicknesses and materials according to strength requirements. Areas with high strength requirements can use high-strength steel plates with varying thicknesses. The thickness of the sheet metal can be appropriately increased in areas with lower strength requirements, while ordinary sheet metal can be used in areas with lower strength requirements. The various areas are connected into a whole by welding. The material blank is made up of multiple small pieces of different thicknesses and materials, which can greatly improve the material utilization rate and reduce the material cost. Secondly, in order to further reduce the weight of the sheet metal of the subframe 10, differential thickness plates can be used in various areas. The differential thickness plates are made thicker in areas with installation requirements and thinner in areas without requirements. The weight reduction advantage of differential thickness plate material is fully utilized to further reduce the weight of the subframe 10 and reduce the material usage cost.

[0144] Based on the inventive concept of this application, the following provides a specific embodiment of the subframe 10 as an exemplary illustration of the inventive concept of this application.

[0145] Reference Figures 15 to 19 As shown, in Figure 15 The subframe 10 shown can be divided into several different areas, corresponding to the multiple spliced ​​bodies 101 forming the subframe 10, namely, a first high-strength thick plate area A1, a first high-strength thin plate area A2, a low-strength thin plate area A3, a second high-strength thin plate area A4, a second high-strength thick plate area A5, a first thick plate area A6, and a second thick plate area A7. For clarity, the relative positions of each plate area are indicated by varying line colors in the attached drawings. Furthermore, for ease of explanation, in... Figure 15 In the example, the upward direction is defined as the front end and the downward direction as the rear end. It is understood that the descriptions of "front end" and "rear end" in this application should be regarded as exemplary illustrations of the relative positions of the various structural parts in the subframe 10, and should not be regarded as limitations on the individual structures of the subframe 10 itself.

[0146] The first high-strength thick plate area A1 and the second high-strength thick plate area A5 may be equipped with front mounting points for the control arm, for connection to the vehicle control arm. For better transmission of load and torque at the wheel end, refer to... Figure 16 and Figure 17The first high-strength thick plate area A1 and the second high-strength thick plate area A5 are set to be thicker (relative to each thin plate area) high-strength steel plates. Specifically, a thicker plate can be set at the location of the installation point in front of the swing arm, and the thickness of the material can be reduced at the splicing position with its front end through the continuously changing Tailor Rolled Blanks (TRB) technology.

[0147] The first high-strength sheet metal area A2 and the second high-strength sheet metal area A4 may be provided with body mounting points for connection to the vehicle body. To buffer and isolate powertrain and wheel vibrations and forces, refer to... Figure 18 and Figure 19 The first high-strength thin plate area A2 and the second high-strength thin plate area A4 are designed as thinner plates of high-strength material (relative to each thick plate area). Specifically, the body mounting point area can be configured with a thicker plate thickness using TRB technology, while other areas can be configured with a thinner plate thickness. For example, the first high-strength thin plate area A2 is configured with a thinner plate thickness relative to the rear end of the first high-strength thick plate area A1, which is used to connect the first high-strength thick plate area A1.

[0148] The low-strength thin plate area A3 is configured with the main function of resisting bending. This area can be configured with low strength or relatively thin plate thickness. Its left and right ends are connected to the first high-strength thin plate area A2 and the second high-strength thin plate area A4 by laser welding (Tailor Welded Blank, abbreviated as TWB).

[0149] The stabilizer bar and steering gear are designed to be installed using steel sleeves. The installation points for the stabilizer bar and steering gear are located in the first thick plate area A6, where the dynamic stiffness requirement is high, and the design uses a thicker plate structure.

[0150] The powertrain mount mounting point is located in the second thick plate area A7, which is used to connect the powertrain mount. The second thick plate area A7 is an independent "bowl" shaped structure on the upper plate, thereby improving the dynamic stiffness of the mount mounting point.

[0151] Reference Figures 20 to 22 As shown, Figure 15 The partitioning of the subframe 10 shown is just one option; for example, it could also be implemented using... Figure 21 The subframe is shown in 10 sections. A1' and A3' are the left and right longitudinal beam sections, respectively, both made of TRB high-strength steel. A2' is the front crossbeam section, which uses a thinner plate. A4' is the rear crossbeam area, which uses a thicker plate. (Refer to...) Figure 21 and Figure 22 As shown in the diagram, the TRB thickness distribution in region A1' is divided into four regions of different thicknesses by TRB. For example, the thicker regions A11' are configured to connect the vehicle body, control arms, etc., while the thinner regions A12' connect the rest of the subframe or other regions.

[0152] In some embodiments, the subframe 10 of this application may be made of steel plate. Compared with conventional solutions that use aluminum to make the subframe in order to reduce the weight of the subframe, this application achieves relatively low manufacturing cost while controlling the weight of the subframe 10 by reasonably configuring the thickness and material of each area of ​​the subframe 10.

[0153] Reference Figure 23 As shown, this application also provides a vehicle 1, including the aforementioned subframe 10.

[0154] Reference Figure 4 , Figure 7 , Figure 17 , Figure 19 , Figure 22 As shown, the splice body 101 has different dimensions along the second direction D2 at different locations in the first direction D1 (e.g., Figure 22 (The parts referred to by A12' and A11' have different dimensions in the second direction D2). The dimensions of different parts of the splice body 101 along the second direction D2 are the dimensions of the second direction D2.

[0155] That is, the splice body 101 extends along the first direction D1 to form multiple parts with different sizes in the second direction D2. As a specific solution, the direction of the cross section splice line 105 can be set so that the second direction D2 is configured as the thickness direction of the splice body 101. Alternatively, the vertical direction of the subframe 10 can be set. In other words, in this application, the size of the second direction D2 can be equal to the thickness in some cases.

[0156] In some embodiments of this application, the dimensions of different parts of the splice body 101 along the second direction D2 are the dimensions of the second direction D2; the splicing is welding, and the splice bodies 101 are fixedly connected by welding; the second direction D2 dimension of the end of the splice body 101 in the first direction D1 is smaller than the maximum second direction D2 dimension of the splice body 101.

[0157] Wherein, the second direction D2 dimension of the end of the splice body 101 in the first direction D1 is greater than the minimum second direction D2 dimension of the splice body 101 and less than the maximum second direction D2 dimension of the splice body 101.

[0158] Among them, the dimensions of different parts of the splice body 101 along the second direction D2 are the dimensions of the second direction D2; the two ends of the splice formed by two adjacent splice bodies 101 have different dimensions of the second direction D2.

[0159] The dimensions of different parts of the splice body 101 along the second direction D2 are the dimensions of the second direction D2; the two ends of the splice body 101 in the first direction D1 have different dimensions of the second direction D2.

[0160] The dimensions of different parts of the splicing body 101 along the second direction D2 are the dimensions of the second direction D2; the position of the maximum second direction D2 dimension of the splicing body 101 is set between the two ends of the splicing body 101 in the first direction D1; the dimensions of different parts of the splicing body 101 along the second direction D2 are the dimensions of the second direction D2; the splicing body 101 includes a splicing structure part whose second direction D2 dimension gradually changes.

[0161] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0162] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0163] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0164] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A subframe, characterized in that, include: The frame consists of multiple fixedly connected assembly parts; Wherein, two adjacent splicing bodies form a splice in a first direction and have a cross-sectional splicing line extending at least along a second direction; the first direction and the second direction intersect; The splice body has different dimensions along the second direction at different locations in the first direction; Two adjacent splice bodies are interlocked.

2. The subframe according to claim 1, characterized in that, The dimensions of different parts of the splice body along the second direction are the dimensions of the second direction. The splicing is a welding process, and the spliced ​​bodies are fixedly connected by the welding; the second dimension of the end of the spliced ​​body in the first direction is smaller than the maximum second dimension of the spliced ​​body.

3. The subframe according to claim 2, characterized in that, in, The second-direction dimension of the end of the splice in the first direction is greater than the minimum second-direction dimension of the splice and less than the maximum second-direction dimension of the splice.

4. The subframe according to claim 1, characterized in that, The dimensions of different parts of the splice body along the second direction are the dimensions of the second direction. The two ends of the two adjacent splicing bodies have different dimensions in the second direction.

5. The subframe according to claim 1, characterized in that, The dimensions of different parts of the splice body along the second direction are the dimensions of the second direction. The splice body has different dimensions in a second direction at its two ends in the first direction.

6. The subframe according to claim 1, characterized in that, The dimensions of different parts of the splice body along the second direction are the dimensions of the second direction. The position of the maximum second-direction dimension of the splice body is set between the two ends of the splice body in the first direction.

7. The subframe according to claim 1, characterized in that, The dimensions of different parts of the splice body along the second direction are the dimensions of the second direction. The splicing body includes a splicing structure whose dimensions gradually change in the second direction.

8. The subframe according to any one of claims 1 to 7, characterized in that, The splicing body is configured to be composed of plates of varying thickness.

9. The subframe according to any one of claims 1 to 7, characterized in that, The blank of the spliced ​​body before stamping is composed of plates of varying thickness.

10. The subframe according to any one of claims 1 to 7, characterized in that, The splicing components in the frame are all formed by a single stamping process.

11. The subframe according to claim 10, characterized in that, in, The cross-sectional splicing line includes: a straight line segment or a curved segment.

12. The subframe according to claim 11, characterized in that, in, The curved segment of the cross-sectional splicing line includes a circular arc curve.

13. The subframe according to claim 11, characterized in that, in, The shape formed by the straight segments of the cross-sectional splicing line includes at least one of trapezoidal, triangular and rectangular shapes.

14. The subframe according to claim 11, characterized in that, At least a portion of the straight line segment is perpendicular to the first direction.

15. The subframe according to claim 11, characterized in that, At least a portion of the straight line segment is parallel to the second direction.

16. The subframe according to claim 11, characterized in that, The curved segment is positioned between the two straight segment segments.

17. The subframe according to claim 10, characterized in that, in, The cross-sectional splicing line of two adjacent splice bodies extends along the second direction.

18. The subframe according to claim 10, characterized in that, in, The cross-sectional splicing line is inclined or perpendicular to the first direction; or, the cross-sectional splicing line is inclined to the second direction.

19. The subframe according to claim 10, characterized in that, in, The multiple fixedly connected splice bodies include at least two splice bodies with different materials.

20. The subframe according to claim 10, characterized in that, in, The multiple fixedly connected splice bodies include at least two splice bodies with different maximum thicknesses.

21. The subframe according to claim 10, characterized in that, in, The multiple fixedly connected splice bodies include at least two splice bodies with different minimum thicknesses.

22. The subframe according to claim 10, characterized in that, in, The number of the splicing elements in the frame is greater than or equal to 3.

23. The subframe according to claim 10, characterized in that, The subframe comprises two frames arranged opposite each other.

24. The subframe according to claim 10, characterized in that, in, In two opposing frames, the splicing body of one frame is correspondingly arranged with the splicing body of the other frame.

25. The subframe according to any one of claims 1 to 7, characterized in that, The frame is divided into: The crossbeam area is the crossbeam used to form the subframe; The longitudinal beam area, which consists of the longitudinal beams that form the subframe; At least one of the crossbeam region and the longitudinal beam region includes a plurality of the splice bodies.

26. The subframe according to claim 25, characterized in that, One of the splices constitutes at least a portion of the crossbeam region or the longitudinal beam region.

27. The subframe according to claim 25, characterized in that, The beam area is composed of one of the splice bodies.

28. The subframe according to claim 1, characterized in that, The subframe also includes: a suspension mounting structure, a suspension mounting structure, and a body mounting structure; The suspension mounting structure, the suspension mounting structure, and the vehicle body mounting structure are all installed to the frame; at least two of the suspension mounting structure, the suspension mounting structure, and the vehicle body mounting structure are fixedly connected to two different splicing bodies.

29. The subframe according to claim 1, characterized in that, The multiple fixedly connected splice bodies include two splice bodies that are fixedly connected by welding.

30. The subframe according to claim 1, characterized in that, The second direction is the thickness direction of the spliced ​​body.

31. A vehicle, characterized in that, Includes the subframe as described in any one of claims 1 to 30.

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