Vehicle and auxiliary frame thereof

Abstract

The invention relates to a vehicle and an auxiliary frame thereof, and the auxiliary frame comprises a frame body which comprises a plurality of fixedly connected splicing bodies; every two adjacent splicing bodies are spliced in the first direction and are provided with section splicing lines at least extending in the second direction; the first direction is intersected with the second direction; and the splicing bodies have different sizes in the second direction at different parts in the first direction. The vehicle frame has the beneficial effects that through splicing of the splicing bodies in the first direction and differentiated design of the splicing bodies in the second direction, the light weight and the strength of the vehicle frame are both considered.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle frame molding, and in particular to a vehicle and a subframe thereof. Background Art

[0002] As an important structure of a vehicle for bearing loads, the frame often has high requirements for frame strength. At the same time, for the sake of economy, it is often hoped that the frame will be lightweight.

[0003] In the related art, a vehicle frame is often formed by stamping and welding a plurality of blanks so that the frame has a hollow structure, thereby ensuring the strength of the frame while reducing the weight of the frame.

[0004] However, in the related art, the splicing method between the blanks often causes unnecessary weight increase, thus deviating from the purpose of lightweighting the frame; and simply reducing the overall frame material will affect the strength of the frame. Summary of the invention

[0005] The embodiments of the present application provide a vehicle and a subframe thereof, which improve the safety of the subframe and at least partially solve the above-mentioned technical problems.

[0006] In order to achieve the above object, according to a first aspect of the present application, a subframe is provided, comprising:

[0007] A frame body, comprising a plurality of fixedly connected spliced ​​bodies;

[0008] Wherein, two adjacent splicing bodies are spliced ​​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 splicing body has different sizes along the second direction at different locations along the first direction.

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

[0011] Optionally, in some embodiments of the present application, the second direction dimension of the end of the splicing body in the first direction is larger than the minimum second direction dimension of the splicing body and smaller than the maximum second direction dimension of the splicing body.

[0012] Optionally, in some embodiments of the present application, the size of different parts of the spliced ​​body along the second direction is the second direction size;

[0013] The two ends of the two adjacent splicing bodies that are spliced ​​have different second direction dimensions.

[0014] Optionally, in some embodiments of the present application, the size of different parts of the spliced ​​body along the second direction is the second direction size;

[0015] The two ends of the splicing body in the first direction have different dimensions in the second direction.

[0016] Optionally, in some embodiments of the present application, the size of different parts of the spliced ​​body along the second direction is the second direction size;

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

[0018] Optionally, in some embodiments of the present application, the size of different parts of the spliced ​​body along the second direction is the second direction size;

[0019] The splicing body comprises a splicing structure portion whose size in the second direction gradually changes.

[0020] Optionally, in some embodiments of the present application, the spliced ​​body is configured to be composed of plates of different thicknesses.

[0021] Optionally, in some embodiments of the present application, the blank of the splicing body before stamping is composed of a plate of different thickness.

[0022] Optionally, in some embodiments of the present application, the splicing bodies in the frame are all formed by one-time stamping.

[0023] Optionally, in some embodiments of the present application, two adjacent splicing bodies are embedded in each other.

[0024] Optionally, in some embodiments of the present application, the profile stitching line includes: a straight line segment or a curved line segment.

[0025] Optionally, in some embodiments of the present application, the curve of the profile splicing line includes an arc curve.

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

[0027] Optionally, in some embodiments of the present application, at least part of the straight line segments are perpendicular to the first direction.

[0028] Optionally, in some embodiments of the present application, at least part of the straight line segments are parallel to the second direction.

[0029] Optionally, in some embodiments of the present application, the curved segment is arranged between the two straight line segments.

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

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

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

[0033] Optionally, in some embodiments of the present application, the plurality of fixedly connected splicing bodies include at least two splicing bodies having different maximum thicknesses.

[0034] Optionally, in some embodiments of the present application, the plurality of fixedly connected splicing bodies include at least two splicing bodies having different minimum thicknesses.

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

[0036] Optionally, in some embodiments of the present application, the splicing bodies in the frame are all formed by one-time stamping.

[0037] Optionally, in some embodiments of the present application, the sub-frame includes two frames arranged opposite to each other.

[0038] Optionally, in some embodiments of the present application, the splicing body of one of the two relatively arranged frames is arranged corresponding to the splicing body of the other frame.

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

[0040] a crossbeam region for forming a crossbeam of the subframe;

[0041] A longitudinal beam region, used to form a longitudinal beam of the subframe;

[0042] Wherein, at least one of the cross beam area and the longitudinal beam area includes a plurality of the splicing bodies.

[0043] Optionally, in some embodiments of the present application, one of the spliced ​​bodies at least constitutes at least a part of the cross beam area or the longitudinal beam area.

[0044] Optionally, in some embodiments of the present application, the beam area is composed of one spliced ​​body.

[0045] Optionally, in some embodiments of the present application, the subframe further comprises: a suspension mounting structure, a hanging mounting structure and a vehicle body mounting structure;

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

[0047] Optionally, in some embodiments of the present application, the plurality of fixedly connected spliced ​​bodies include two spliced ​​bodies fixedly connected by welding.

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

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

[0050] The beneficial effect of the present application is that both the lightness and strength of the frame are taken into consideration through the splicing of the splicing bodies in the first direction and the differentiated design of the splicing bodies in the second direction.

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

[0052] By improving the splicing method, the redundancy of materials in the second direction during splicing is reduced, and at the same time, the spliced ​​body has a size change in the second direction so that the amount of material and the structural strength in the second direction can be taken into account when the spliced ​​body forms a frame;

[0053] Smaller structural dimensions are used at the welding points, making welding easier to achieve, and the lightweight benefits brought by welding can be converted into structural reinforcement of the joint body where needed, avoiding the problem that the welds cannot be used as load-bearing parts and require redundant materials.

[0054] The internal overlap of the spliced ​​body can ensure both the strength of the fixed connection and the effect of reducing the weight.

[0055] By adopting the scheme of integrally stamping the spliced ​​body, the production efficiency can be highly improved;

[0056] Through the combination of the splicing bodies, the thickness, material, etc. of the splicing bodies can be configured in a targeted manner according to the specific needs of each area, thereby achieving targeted reinforcement of the frame.

[0057] Other features and advantages of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0059] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

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

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

[0062] Figure 3 is a schematic diagram of a top view of the upper plate provided in an exemplary embodiment of the present application;

[0063] Figure 4 is a schematic diagram of a structure in which an upper plate and a lower plate are spliced ​​by laser in an exemplary embodiment of the present application;

[0064] Figure 5 It is a schematic diagram of the overlap structure between the upper plate and the lower plate using conventional gas shielded welding in the related art;

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

[0066] Figure 7 is a schematic cross-sectional structure diagram of an upper plate provided in an exemplary embodiment of the present application;

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

[0068] Fig. 9 is a schematic diagram of an upper plate provided in an exemplary embodiment of the present application using a second type of blank partition;

[0069] Fig.10 is a schematic diagram of a first mode of a welding line between splicing areas provided in an exemplary embodiment of the present application;

[0070] Fig.11 is a schematic diagram of a second method of welding lines between splicing areas provided in an exemplary embodiment of the present application;

[0071] Fig.12is a schematic diagram of a third method of welding lines between splicing areas provided in an exemplary embodiment of the present application;

[0072] Fig.13 is a schematic diagram of a first welding method between an upper plate and a lower plate provided in an exemplary embodiment of the present application;

[0073] Fig.14 Schematic diagram of the second welding method between the upper plate and the lower plate provided in the exemplary embodiment of the present application

[0074] Fig.15 is a schematic diagram of the thickness distribution of a subframe provided in an exemplary embodiment of the present application;

[0075] Fig.16 yes Fig.15 A schematic diagram of a first portion of the subframe shown;

[0076] Fig.17 yes Fig.16 Schematic diagram of the middle BB section;

[0077] Fig.18 yes Fig.15 A schematic diagram of a second portion of the subframe shown;

[0078] Fig.19 yes Fig.18 Schematic diagram of the CC section;

[0079] Fig. 20 is another schematic diagram of a subframe provided in an exemplary embodiment of the present application;

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

[0081] Fig. 22 yes Fig.21 Schematic diagram of the middle DD section;

[0082] Fig.23 is a schematic diagram of a vehicle provided in an exemplary embodiment of the present application.

[0083] Description of reference numerals:

[0084] 1. Vehicle; 10. Subframe; 100. Upper plate; 101. Splicing body; 102. Suspension mounting structure; 103. Suspension mounting structure; 104. Vehicle body mounting structure; 105. Section splicing line; 200. Lower plate; 20. Space between plates; D1. First direction; D2. Second direction. DETAILED DESCRIPTION

[0085] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0086] Reference Figures 1 to 22 As shown, the present application provides a sub-frame 10, comprising: an upper plate 100 and a lower plate 200. The upper plate 100 can be regarded as one frame in the present application, and the lower plate 200 can be regarded as another frame in the present application.

[0087] Specifically, the sub-frame 10 includes an upper plate 100 disposed at a relatively upper side and a lower plate 200 disposed at a relatively lower side, wherein the relatively upper side and the relatively lower side are used to schematically describe the relative positional relationship between the upper plate 100 and the lower plate 200, but are not intended to limit the specific positions of the two. The upper plate 100 and the lower plate 200 are butt-jointed together to form a sub-frame 10.

[0088] Reference Figure 4 , Fig.10 as well as Fig.11 As shown, the upper plate 100 is a frame, which includes a plurality of fixedly connected splicing bodies 101; wherein two adjacent splicing bodies 101 are spliced ​​in the first direction D1 and have a cross-sectional splicing line 105 extending at least along the second direction D2. Specifically, the cross-sectional splicing line 105 extends at least along the second direction D2 in the cross section where the first direction D1 and the second direction D2 are located.

[0089] This will avoid Figure 5 In the illustrated embodiment, there are overlapping portions in the first direction D1, thereby adding unnecessary weight.

[0090] Reference Figure 4 As shown, as a specific solution, 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 butted with 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 Fig.10 and Fig.11 As shown, as a specific solution, two adjacent splicing bodies 101 are arranged to overlap inside in the first direction D1.

[0092] Different from Figure 5In the solution shown, the overlapping structures of the two splicing bodies 101 in the first direction D1 are arranged inside in the second direction D2, which does not increase the thickness stacking of the joint and the mass of the corresponding part, thereby reducing the use of blanks while ensuring strength.

[0093] More specifically, refer to Fig.10 as well as Fig.11 As shown, the section stitching line 105 includes a straight line segment or a curve segment.

[0094] In some embodiments of the present application, the curve of the cross-section stitching line 105 includes an arc curve.

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

[0096] In some embodiments of the present application, at least a portion of the straight line segments are perpendicular to the first direction D1.

[0097] In some embodiments of the present application, at least a portion of the straight line segments are parallel to the second direction D2.

[0098] In some embodiments of the present application, the curved segment is disposed between two straight line segments.

[0099] Reference Figure 4 , Fig.10 as well as Fig.11 As shown, the upper plate 100 is used as a frame, which includes a plurality of fixedly connected splicing bodies; wherein two adjacent splicing bodies are spliced ​​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 illustrated solution, there are overlapping portions in the first direction, thereby adding unnecessary weight.

[0101] Reference Figure 4 As shown, as a specific solution, 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 butted with straight ends. More specifically, the cross-sectional splicing line is inclined with the first direction or the second direction.

[0102] Reference Fig.10 and Fig.11 As shown, as a specific solution, two adjacent splicing bodies are arranged to overlap inside in the first direction.

[0103] Different from Figure 5In the solution shown, the structures of the two splicing bodies overlapping in the first direction are arranged inside in the second direction, which does not increase the thickness stacking of the joint and the mass of the corresponding part, thereby reducing the use of blanks while ensuring strength.

[0104] More specifically, refer to Fig.10 as well as Fig.11 As shown, the section splicing line includes: a straight line segment or a curve segment.

[0105] In some embodiments of the present application, the curve of the cross-section splicing line includes an arc curve.

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

[0107] In some embodiments of the present application, at least a portion of the straight line segments are perpendicular to the first direction.

[0108] In some embodiments of the present application, at least part of the straight line segments are parallel to the second direction.

[0109] In some embodiments of the present application, the curved segment is disposed between two straight line segments.

[0110] Among them, refer to Figures 2 to 9 As shown, the upper plate 100 or the lower plate 200 has a plurality of splicing bodies 101 ; the following is a schematic description of the arrangement of a plurality of splicing bodies on the upper plate.

[0111] The two spliced ​​bodies 101 are fixedly connected by laser welding, that is, the multiple spliced ​​bodies 101 are connected into a whole at least by laser welding.

[0112] By adopting the above scheme, laser welding can effectively avoid overlapping surfaces between different joint bodies, thereby saving materials at the overlapping positions. On the basis of reducing material usage, the total weight of the frame can be improved, while avoiding dimensional errors caused by welding springback.

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

[0114] In some embodiments, the number of the 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, different connection positions are set on different splicing bodies according to the connection positions with the suspension, body, suspension and other parts of the vehicle, so as to reasonably arrange the connection relationship between the subframe and other parts of the vehicle. It is also convenient 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 to meet the use requirements.

[0116] In some embodiments, different splicing bodies 101 have different materials, that is, for at least two different splicing bodies 101, the difference in the materials of the splicing bodies 101 can be used to adapt to the strength requirements of different areas of the sub-frame. For example, in areas where the sub-frame is subjected to high loads when in use (such as the installation position of the suspension), higher-strength materials are configured, while in areas where the loads are relatively low, lower-strength materials are configured, so as to control the overall cost or weight of the sub-frame.

[0117] In some embodiments, different splicing bodies 101 have different thicknesses, that is, for at least two different splicing bodies 101, the strength requirements of different areas of the sub-frame 10 can be met by the difference in the materials of the splicing bodies 101. For example, a larger thickness is configured in an area that bears a high load when the sub-frame 10 is in use (such as the installation position of the suspension), and a smaller thickness is configured in an area that bears a relatively low load, so as to control the overall cost or weight of the sub-frame 10.

[0118] In some embodiments, the splicing body 101 of the upper plate 100 is arranged corresponding to the splicing body 101 of the lower plate 200, 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 different usage requirements, the splicing blanks constituting the splicing body 101 have an irregular shape or a rectangular shape. The present application does not limit the specific form of the splicing body. For example, the splicing blank can have a rectangular cross-section as a whole, and further form protrusions, grooves, etc. on the rectangular cross-section, so that the cross-section of the splicing blank is an irregular shape different from the rectangular shape.

[0120] like Figures 2 to 4 As shown, the upper plate 100 has a plurality of spliced ​​bodies 101, and the spliced ​​bodies 101 are not connected by Figure 5 The welding is performed in the overlapping manner shown, that is, conventional carbon dioxide gas shielded welding is not used, but laser welding is directly used to form a fixed connection between the two spliced ​​bodies 101.

[0121] During stamping, the blanks of the plurality of splicing bodies 101 are first spliced ​​by laser welding, and then two splicing bodies 101 are formed at one time by the same stamping, that is, the blanks of the two splicing bodies 101 are welded and then stamped into two splicing bodies 101 by one stamping.

[0122] In a specific implementation manner, all the splicing bodies 101 of the upper plate 100 or the lower plate 200 are, for example, formed by one-time stamping.

[0123] In some embodiments, the two spliced ​​bodies formed by the same stamping have different maximum sheet thicknesses.

[0124] Reference Figure 4 and Figure 5 As shown, the above solution obviously reduces the use of materials and weight because the overlap area is reduced, and laser welding can effectively ensure the size requirements of the splicing. In this way, in the process of manufacturing the frame from the blank to the finished product, the amount of material added to the blank to meet the use strength requirements can be reduced, effectively improving the material utilization rate of the blank. Moreover, under the premise of meeting the use strength requirements, the weight of the frame is effectively reduced, which is conducive to achieving lightweight frame.

[0125] Reference Figure 6 and Figure 7 As shown, at least one of the spliced ​​bodies 101 in the upper plate 100 is a plate of different thickness. That is, the thickness inside a spliced ​​body 101 can also be designed so that it is thickened at a required location to ensure strength, while the remaining parts are thinner to reduce weight.

[0126] Of course, only part of the spliced ​​bodies 101 of the upper plate 100 may be welded into one piece by blanks and then stamped at one time, while the other part of the spliced ​​bodies 101 may be spliced ​​by welding after forming.

[0127] Reference Figure 8 As shown, the blank of the splicing body 101 can be made into a regular rectangle to save the blanking process of each region. Alternatively, the two splicing bodies 101 made by the same stamping have different minimum plate thicknesses. Alternatively, the two splicing bodies 101 made by the same stamping have different plate thicknesses at the welding point. Of course, the above three situations can also be combined.

[0128] Reference Fig. 9 As shown, the blank of the splicing body 101 can be made into a special-shaped shape that is relatively consistent with the shape of the splicing body 101 after forming, as long as it is ensured that the splicing position 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 once after the blanks are welded into a whole. As an optional solution, stamping can also be performed in batches so that only a part of the blanks are formed into splicing bodies 101 each time.

[0130] Reference Figures 10 to 12As shown, in some embodiments, the end surfaces of two splicing bodies 101 are abutted 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 surfaces of the two splicing bodies 101 form an embedding structure for one splicing body 101 to be embedded in the other splicing body 101. Fig.11 The trapezoidal embedding shown and Fig.12 The arc-shaped embedding shown in the figure not only maintains the strength of the spliced ​​body, but also reduces the welding area and the area of ​​the heat-affected zone.

[0132] That is, two adjacent splicing bodies 101 are embedded in each other.

[0133] Reference Fig.13 and Fig.14 As shown, in some embodiments, the subframe 10 is provided with two upper plates 100 and lower plates 200 disposed opposite to each other; the upper plate 100 and the lower plate 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 plate 100 and the lower plate 200 can be performed by Fig.13 The laser welding shown can also be performed by gas shielded welding with overlapping areas.

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

[0135] Reference Figure 7 As shown, a spliced ​​body 101 can have a continuous thickness change, which is convenient for stamping and forming.

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

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

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

[0139] In particular, a spliced ​​body forms at least a part 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 hanging mounting structure 103 and a vehicle body mounting structure 104 .

[0141] At least two of the suspension mounting structure 102, the suspension mounting structure 103 and the body mounting structure 104 are fixedly connected to two different splicing bodies 101 in one upper plate 100. As a specific solution, 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 a mounting sleeve, etc.

[0142] In some embodiments, at least two splicing bodies 101 in the upper plate 100 are made of different materials. In particular, the two splicing bodies 101 made by the same stamping are made of different materials, for example, one splicing body 101 is made of a material with relatively high strength, and the other splicing body 101 is made of a material with relatively low strength, so that the splicing body 101 made of a material with relatively high strength can be used to connect and install vehicle parts, and the splicing body 101 made of a material with relatively low strength can reduce the overall cost of the frame.

[0143] Based on the technical solution of the present application, when designing the sub-frame 10, the transfer conditions of each installation point can be optimized to make the overall surface undulation of the sheet metal of the sub-frame 10 as smooth and continuous as possible, and then the main body of the sub-frame 10 can be designed into two parts, an upper plate and a lower plate, so that the upper plate / lower plate can be stamped and formed at one time through a sheet of material, which can effectively improve the production efficiency; wherein, in order to effectively reduce the weight of the sub-frame 10 and reduce the material cost, the upper plate / lower plate can be divided into a plurality of areas, and each area is set to a different material thickness and material according to the strength requirements. High-strength plates can be used in areas with high strength requirements, and the material thickness can be reduced. It can be appropriately set to be thicker, and ordinary plates can be used in areas with low strength requirements. The material thickness can be appropriately thinner. Each area is connected into a whole by welding. The material blank is made of multiple small pieces of different material thicknesses and different materials. The material utilization rate can be greatly improved and the material cost can be reduced. Secondly, in order to further reduce the weight of the sub-frame 10 sheet metal, each area can use a differential thickness plate. The differential thickness plate is set thicker at the position with installation requirements, and appropriately thinner at the place without requirements. The weight reduction advantage of the differential thickness plate material is fully utilized to further achieve the weight reduction of the sub-frame 10 and reduce the material usage cost.

[0144] Based on the inventive concept of the present application, a specific implementation scheme of a subframe 10 is provided below as an exemplary description of the inventive concept of the present application.

[0145] Reference Figures 15 to 19 As shown, in Fig.15 In the subframe 10 shown, the subframe 10 can be divided into several different areas, corresponding to the multiple splicing bodies 101 forming the subframe 10 in the subframe, which are the first high-strength thick plate area A1, the first high-strength thin plate area A2, the low-strength thin plate area A3, the second high-strength thin plate area A4, the second high-strength thick plate area A5, the first thick plate area A6 and the second thick plate area A7. For the convenience of illustration, the relative positions of the plate areas are indicated by the shades of the lines in the drawings, and for the convenience of explanation, Fig.15 In the perspective of the example, the upward direction is defined as the front end, and the downward direction is defined as the rear end. It is understood that the description of the "front end" and "rear end" in the present application should be regarded as an exemplary description of the relative positions of the various structures in the sub-frame 10, and should not be regarded as a limitation on the various structures of the sub-frame 10 itself.

[0146] The first high-strength thick plate area A1 and the second high-strength thick plate area A5 may be provided with a swing arm front mounting point for connecting to the vehicle swing arm. In order to better transmit the load and torque at the wheel end, refer to Fig.16 and Fig.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 thickness can be set at the location of the front installation point of the swing arm, and the material thickness can be reduced at the front end splicing position through the continuously changing roller thin plate (Tailor Rolled Blanks, TRB for short) technology.

[0147] The first high-strength sheet area A2 and the second high-strength sheet area A4 may be provided with body mounting points for connecting to the body of the vehicle. In order to buffer and isolate the vibration and force of the powertrain and wheels, refer to Fig.18 and Fig.19 The first high-strength thin plate area A2 and the second high-strength thin plate area A4 are designed to be thinner plates of high-strength materials (relative to the thick plate areas). Specifically, the TRB technology can be used to configure the material thickness in the vehicle body mounting point area with a thicker plate thickness, and other areas with a thinner plate thickness. For example, the first high-strength thin plate area A2 is used to connect the rear end of the first high-strength thick plate area A1 and is configured as a thinner plate thickness relative to the vehicle body mounting point area.

[0148] The low-strength thin plate area A3 is configured to resist bending. This area can be configured as low strength or thinner 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 tailor welding (Tailor Welded Blank, abbreviated as TWB).

[0149] The installation method of the stabilizer bar and the steering gear is designed to be steel sleeve installation. The installation points of the stabilizer bar and the steering gear are set in the first thick plate area A6. This area has high dynamic stiffness requirements and is designed as a thicker plate structure.

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

[0151] Reference Figure 20 to Figure 22 As shown, Fig.15 The partitioning of the subframe 10 shown is only one solution. For example, Fig.21 The subframe 10 is shown as partitions. A1' and A3' are the left longitudinal beam partition and the right longitudinal beam partition respectively, both of which are made of TRB high-strength steel plates. A2' is the front cross beam partition, which is a thinner plate. A4' is the rear cross beam area, which is a thicker plate. Fig.21 and Fig. 22 As shown, the schematic diagram of the TRB material thickness distribution of the A1' area is divided into four areas of different thicknesses by the TRB, wherein, for example, each thicker area A11' is configured to connect the vehicle body, swing arm, etc., and each thinner area A12' is connected to the rest of the subframe or the rest of the area.

[0152] In some embodiments, the subframe 10 of the present application can be made of a steel plate. Compared with the conventional solution in which the subframe is made of aluminum to reduce the weight of the subframe, the present application reasonably configures the thickness and material of each area of ​​the subframe 10, thereby controlling the weight of the subframe 10 and reducing the manufacturing cost.

[0153] Reference Fig.23 As shown, the present application also provides a vehicle 1 , comprising the aforementioned subframe 10 .

[0154] Reference Figure 4 , Figure 7 , Fig.17 , Fig.19 , Fig. 22 As shown in the figure, different parts of the splicing body 101 in the first direction D1 have different sizes along the second direction D2 (for example, Fig. 22 The sizes of the parts indicated by A12' and A11' in the second direction D2 are different), and the sizes of different parts of the splicing body 101 along the second direction D2 are the sizes of the second direction D2.

[0155] That is, the splicing body 101 extends along the first direction D1 to form a plurality of parts with different sizes in the second direction D2. As a specific solution, the direction of the cross-sectional splicing line 105 can be set so that the second direction D2 is configured as the thickness direction of the splicing body 101, or the up and down direction of the sub-frame 10 can be set, that is, in the present application, the size of the second direction D2 can be equal to the thickness in some cases.

[0156] In some embodiments of the present application, 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 is welding, and the splicing bodies 101 are fixedly connected by welding; the dimensions of the second direction D2 of the ends of the splicing body 101 in the first direction D1 are smaller than the maximum dimensions of the splicing body 101 in the second direction D2.

[0157] The dimension of the end of the splicing body 101 in the first direction D1 in the second direction D2 is larger than the minimum dimension of the splicing body 101 in the second direction D2 and smaller than the maximum dimension of the splicing body 101 in the second direction D2.

[0158] The dimensions of different parts of the splicing body 101 along the second direction D2 are the dimensions of the second direction D2; and the two ends of two adjacent splicing bodies 101 that form the splicing have different dimensions of the second direction D2.

[0159] The dimensions of different parts of the splicing body 101 along the second direction D2 are the dimensions of the second direction D2; the two ends of the splicing 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 dimension of the splicing body 101 in the second direction D2 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 portion whose dimension in the second direction D2 gradually changes.

[0161] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0162] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0163] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0164] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A subframe, characterized in that: include: A frame body, comprising a plurality of fixedly connected spliced ​​bodies; Wherein, two adjacent splicing bodies are spliced ​​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 splicing body has different sizes along the second direction at different locations along the first direction.

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

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

5. The subframe according to claim 1, characterized in that: The dimensions of different parts of the splicing body along the second direction are the second direction dimensions; The two ends of the splicing body in the first direction have different dimensions in the second direction.

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

7. The subframe according to claim 1, characterized in that: The dimensions of different parts of the splicing body along the second direction are the second direction dimensions; The splicing body comprises a splicing structure portion whose size in the second direction gradually changes.

8. The subframe according to any one of claims 1 to 7, characterized in that: The spliced ​​body is configured to be composed of plates of different thickness.

9. The subframe according to any one of claims 1 to 7, characterized in that: The blank of the spliced ​​body before punching is composed of a plate of different thickness.

10. The subframe according to any one of claims 1 to 7, characterized in that: The splicing bodies in the frame are all formed by one-time stamping.

11. The subframe according to any one of claims 1 to 7, characterized in that: in, Two adjacent splicing bodies are embedded in each other.

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

13. The subframe according to claim 11, characterized in that: in, The curve of the section splicing line includes an arc curve.

14. The subframe according to claim 11, characterized in that: in, The shape formed by the straight line segments of the cross-section splicing line includes at least one of a trapezoid, a triangle and a rectangle.

15. The subframe according to claim 11, characterized in that: At least part of the straight line segments are perpendicular to the first direction.

16. The subframe according to claim 11, characterized in that: At least part of the straight line segments are parallel to the second direction.

17. The subframe according to claim 11, characterized in that: The curved line segment is arranged between the two straight line segments.

18. The subframe according to claim 10, characterized in that: in, A cross-sectional splicing line between two adjacent splicing bodies extends along a second direction.

19. 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.

20. The subframe according to claim 10, characterized in that in, The plurality of fixedly connected splicing bodies include at least two splicing bodies made of different materials.

21. The subframe according to claim 10, characterized in that: in, The plurality of fixedly connected splicing bodies include at least two splicing bodies having different maximum thicknesses.

22. The subframe according to claim 10, characterized in that: in, The plurality of fixedly connected splicing bodies include at least two splicing bodies having different minimum thicknesses.

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

24. The subframe according to claim 10, characterized in that: in, The splicing bodies in the frame are all formed by one-time stamping.

25. The subframe according to claim 10, characterized in that: The auxiliary frame includes two frame bodies which are arranged opposite to each other.

26. The subframe according to claim 24, characterized in that: in, The splicing body of one of the two oppositely arranged frames is arranged correspondingly to the splicing body of the other frame.

27. The subframe according to any one of claims 1 to 7, characterized in that: The frame is divided into: a crossbeam region for forming a crossbeam of the subframe; A longitudinal beam region, used to form a longitudinal beam of the subframe; Wherein, at least one of the cross beam area and the longitudinal beam area includes a plurality of the splicing bodies.

28. The subframe according to claim 27, characterized in that: One of the spliced ​​bodies at least forms at least a part of the transverse beam region or the longitudinal beam region.

29. The subframe according to claim 26, characterized in that The crossbeam region is formed by one of the spliced ​​bodies.

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

31. The subframe according to claim 1, characterized in that: The plurality of fixedly connected spliced ​​bodies include two spliced ​​bodies fixedly connected by welding.

32. The subframe according to claim 1, characterized in that: The second direction is the thickness direction of the splicing body.

33. A vehicle, characterized in that: A subframe comprising the subframe described in any one of claims 1 to 32.

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