A front subframe and a vehicle
By designing a box-shaped front subframe and employing specific deformation modes and reinforced supports, the problems of heavy weight, high cost, and low flexibility in existing technologies have been solved, achieving lightweight and efficient collision protection and improving collision safety performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GAC HONDA AUTOMOBILE CO LTD
- Filing Date
- 2025-07-10
- Publication Date
- 2026-06-26
AI Technical Summary
The existing front subframe is heavy, complex in structure, expensive, and lacks flexibility, and it fails to effectively achieve collision protection.
Design a front subframe including a front crossbeam, a rear crossbeam, a left longitudinal beam, and a right longitudinal beam. It adopts a box-shaped structure and a specific deformation mode. The specific deformation mode is achieved by forming a concave area through the corner fold line of the upper plate of the longitudinal beam to protect the safety of the occupants. The strength and rigidity are improved by strengthening the bracket.
It achieves lightweighting and cost reduction, while effectively protecting the power battery pack and occupant safety during a collision, reducing cab intrusion, and improving collision performance.
Smart Images
Figure CN224409385U_ABST
Abstract
Description
Technical Field
[0001] This utility model is applicable to the automotive field, and in particular relates to a front subframe and an automobile. Background Technology
[0002] The front subframe, a crucial component of the vehicle, is installed at the bottom of the front engine compartment, impacting the vehicle's driving quality, safety, and overall cost. The front subframe not only supports chassis components but also needs to fulfill collision protection functions. Existing publicly available front subframes are heavy, structurally complex, costly, and lack flexibility, which contradicts the trend towards lightweight vehicles. Furthermore, the subframe has collision energy absorption and collision deformation mode control functions, and current subframes do not clearly define how these collision functions are implemented.
[0003] In summary, the problems existing in the relevant technologies urgently need to be solved. Utility Model Content
[0004] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide a front subframe and automobile.
[0005] The technical solution adopted by this utility model to solve its technical problem is:
[0006] In a first aspect, a front subframe includes a front crossbeam, a rear crossbeam, a left longitudinal beam, and a right longitudinal beam. The left and right longitudinal beams are symmetrically arranged, and each of the left and right longitudinal beams includes an upper longitudinal beam plate and a lower longitudinal beam plate. The upper and lower longitudinal beam plates extend longitudinally, and at least one of the edges of the upper and lower longitudinal beam plates is provided with a folded edge. The upper and lower longitudinal beam plates are welded together through the folded edge to form a box-shaped structure with an inner cavity. A recessed area is formed in the middle of the upper longitudinal beam plate by providing a corner fold line.
[0007] In conjunction with the first aspect, in some implementations of the first aspect, the upper plate of the longitudinal beam is provided with a front inclined surface, a bottom plane and a rear inclined surface in the recessed area. The top surface of the upper plate of the longitudinal beam located on the front side of the recessed area extends downward at an angle to the bottom plane through the front inclined surface, and a first corner line is formed between the front inclined surface and the bottom plane. The top surface of the upper plate of the longitudinal beam located on the rear side of the recessed area extends downward at an angle to the bottom plane through the rear inclined surface, and a second corner line is formed between the rear inclined surface and the bottom plane.
[0008] In combination with the first aspect and the above-mentioned implementation methods, in some implementation methods of the first aspect, the upper plate of the longitudinal beam has a first folded edge that bends downward on both sides, and the lower plate of the longitudinal beam has a second folded edge that bends upward on both sides. The upper plate and the lower plate of the longitudinal beam are fastened together, and the first folded edge overlaps and is welded to the second folded edge.
[0009] In combination with the first aspect and the above-mentioned implementation methods, in some implementation methods of the first aspect, the upper plate of the longitudinal beam is formed by stamping the sheet metal to form the corner fold line and the first fold edge, and the lower plate of the longitudinal beam is formed by stamping the sheet metal to form the second fold edge.
[0010] In combination with the first aspect and the above-described implementations, in some implementations of the first aspect, a reinforcing bracket is provided inside the box-shaped structure behind the recessed area, the lower end of the reinforcing bracket is welded to the lower plate of the longitudinal beam, and the upper end of the reinforcing bracket is welded to the upper plate of the longitudinal beam.
[0011] In combination with the first aspect and the above-mentioned implementation methods, in some implementation methods of the first aspect, the upper end of the reinforcing bracket is provided with an overlapping flange bent to one side, the upper plate of the longitudinal beam is clearance-fitted with the overlapping flange, and the upper plate of the longitudinal beam is provided with a welding hole at the position where it fits with the overlapping flange.
[0012] In combination with the first aspect and the above-mentioned implementation methods, in some implementation methods of the first aspect, the left longitudinal beam and the right longitudinal beam are provided with a first vehicle body mounting point interface in front of the recessed area, and the left longitudinal beam and the right longitudinal beam are provided with a second vehicle body mounting point interface and a third vehicle body mounting point interface behind the recessed area.
[0013] In combination with the first aspect and the above-described implementations, in some implementations of the first aspect, the front crossbeam includes an extruded square tube, the left longitudinal beam forms a first insertion interface between the upper plate and the lower plate of the longitudinal beam and is fitted and welded to the left end of the extruded square tube, and the right longitudinal beam forms a second insertion interface between the upper plate and the lower plate of the longitudinal beam and is fitted and welded to the right end of the extruded square tube.
[0014] In combination with the first aspect and the above-mentioned implementation methods, in some implementation methods of the first aspect, the rear crossbeam is provided with a rear suspension mounting bracket and a steering gear mounting bracket. The rear suspension mounting bracket includes a first bracket plate and a second bracket plate, and a U-shaped space is formed between the first bracket plate and the second bracket plate. The edges of the first bracket plate and the second bracket plate are provided with flanges that curl toward the back side of the U-shaped space. The steering gear mounting bracket includes a third bracket plate, which is located on the back side of the second bracket plate and is welded to the second bracket plate as a whole.
[0015] Second, an automobile comprising a front subframe as described in any implementation of the first aspect.
[0016] One of the above technical solutions has at least one of the following advantages or beneficial effects: Since the rear point of the longitudinal beam is the power battery pack, to ensure the safety of the power battery pack, the rear point of the longitudinal beam needs to be fixed under collision conditions. Simultaneously, the drive motor components mounted on the front subframe need not intrude into the firewall or suffer leakage damage. In this technical solution, a concave area is formed in the middle of the upper plate of the longitudinal beam by setting a corner bend. During a collision, the load is transferred from the vehicle body to the front ends of the left and right longitudinal beams, and then through the longitudinal beams to the rear point. During this process, the front point of the front subframe collapses while the rear point remains intact. The front subframe undergoes a V-shaped bending deformation in the concave area, achieving a specific deformation mode to protect occupant safety. By setting the concave area formed by the corner bend, sufficient collision energy absorption is achieved, realizing the predetermined collision motor movement trajectory, reducing intrusion into the passenger compartment, significantly enhancing collision performance, protecting the battery pack from contact during a collision, and greatly improving collision electrical safety requirements.
[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0019] Figure 1 This is a schematic diagram of an embodiment of the front subframe of this utility model;
[0020] Figure 2 This is a side view of a structural embodiment of the front subframe of this utility model;
[0021] Figure 3 This is a top view of an embodiment of the front subframe of this utility model;
[0022] Figure 4 yes Figure 3 Cross-sectional view at point AA;
[0023] Figure 5 yes Figure 3 Cross-sectional view at point BB. Detailed Implementation
[0024] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.
[0025] In this utility model, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this utility model, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.
[0026] In this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number; "above," "below," "within," etc. are understood to include the stated number. In the description of this utility model, if "first" or "second" is used, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.
[0027] In this utility model, unless otherwise explicitly defined, terms such as "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model based on the specific content of the technical solution.
[0028] in, Figure 1 and Figure 3 The reference direction coordinate system of this utility model embodiment is given below, in conjunction with Figure 1 and Figure 3 The embodiments of this utility model will be described in the directions shown.
[0029] See Figure 1 , Figure 2 , Figure 3 This utility model provides a front subframe with a full-frame design, including a front crossbeam 100, a rear crossbeam 200, a left longitudinal beam 301, and a right longitudinal beam 302. The left and right longitudinal beams 301 and 302 are symmetrically arranged. Both the left and right longitudinal beams 301 and 302 include an upper longitudinal beam plate 303 and a lower longitudinal beam plate 304. The upper and lower longitudinal beam plates 303 and 304 extend longitudinally. At least one of the edges of the upper and lower longitudinal beam plates 303 and 304 is provided with a folded edge. The upper and lower longitudinal beam plates 303 and 304 are welded together to form a box-shaped structure with an inner cavity. A recessed area 305 is formed in the middle of the upper longitudinal beam plate 303 by a corner bend.
[0030] Combination Figure 1 , Figure 2 , Figure 3Since the rear point of the longitudinal beam is the power battery pack, it is necessary to fix the rear point of the longitudinal beam under collision conditions to ensure the safety of the power battery pack. Simultaneously, the drive motor components located on the front subframe must not intrude into the firewall or suffer leakage damage. In this technical solution, a recessed area 305 is formed in the middle of the upper plate 303 of the longitudinal beam by setting a corner bend. During a collision, the load is transferred from the vehicle body to the front ends of the left longitudinal beam 301 and right longitudinal beam 302, and then to the rear point of the longitudinal beam. During this process, the front point of the front subframe collapses while the rear point remains intact. The front subframe undergoes a V-shaped bending deformation in the recessed area 305, achieving a specific deformation mode for the subframe to protect occupant safety. By setting the recessed area 305 formed by the corner bend, sufficient collision energy absorption is achieved, realizing the predetermined collision motor movement trajectory, reducing intrusion into the passenger compartment, significantly enhancing collision performance, protecting the battery pack from being touched during a collision, and greatly improving collision electrical safety requirements.
[0031] In some embodiments, see Figure 1 , Figure 2 The upper plate 303 of the longitudinal beam has a front inclined surface 306, a bottom plane 307, and a rear inclined surface 308 in the recessed area 305. The top surface of the upper plate 303 on the front side of the recessed area 305 extends downwards to the bottom plane 307 via the front inclined surface 306, forming a first corner fold line 309 between the front inclined surface 306 and the bottom plane 307. The top surface of the upper plate 303 on the rear side of the recessed area 305 extends downwards to the bottom plane 307 via the rear inclined surface 308, forming a second corner fold line 310 between the rear inclined surface 308 and the bottom plane 307. In this embodiment, the upper plate 303 of the longitudinal beam forms a double-bend area in the recessed area 305 via the first corner fold line 309 and the second corner fold line 310. Under collision conditions, the front subframe can achieve a specific deformation mode to protect the safety of the occupants, achieve sufficient collision energy absorption, realize the predetermined collision motor movement trajectory, and reduce the intrusion into the cab.
[0032] In some embodiments, see Figure 1 The upper plate 303 of the longitudinal beam has downward-bent first folded edges 311 on both sides, and the lower plate 304 of the longitudinal beam has upward-bent second folded edges 312 on both sides. The upper plate 303 and the lower plate 304 of the longitudinal beam are fastened together, and the first folded edges 311 and the second folded edges 312 overlap and are welded. In this embodiment, the upper plate 303 and the lower plate 304 of the longitudinal beam form a box-shaped structure, which fully improves the strength and rigidity of the longitudinal beam.
[0033] Furthermore, the upper plate 303 of the longitudinal beam is formed with a corner fold line and a first folded edge 311 by sheet metal stamping, and the lower plate 304 of the longitudinal beam is formed with a second folded edge 312 by sheet metal stamping. In this embodiment, the left longitudinal beam 301 and the right longitudinal beam 302 adopt a low-cost plate structure welded to form a box-shaped structure, which fully improves the strength and rigidity of the longitudinal beam. Compared with the prior art, it can be miniaturized, has better strength and performance, and maximizes the improvement of strength, rigidity and buckling performance. It not only effectively solves the problems of handling stability and NVH performance, but also achieves the best cost.
[0034] In some embodiments, see Figure 4 , Figure 5 Inside the box-shaped structure, a reinforcing bracket 313 is provided behind the recessed area 305. The lower end of the reinforcing bracket 313 is welded to the lower plate 304 of the longitudinal beam, and the upper end of the reinforcing bracket 313 is welded to the upper plate 303 of the longitudinal beam. This greatly improves the strength and rigidity of the subframe, providing excellent strength and durability, as well as superior NV performance. Furthermore, this design fully considers processing requirements and completely satisfies manufacturing and processing requirements.
[0035] Since the upper plate 303 and lower plate 304 of the longitudinal beam are welded together to form a closed space, the reinforcing bracket 313 is welded to both the upper plate 303 and lower plate 304 within this closed space. Therefore, a special lap joint structure needs to be designed to ensure the welding process is feasible. (See also...) Figure 4 , Figure 5 The upper end of the reinforcing bracket 313 is provided with an overlapping flange 314 bent to one side. The upper plate 303 of the longitudinal beam is clearance-fitted with the overlapping flange 314 to allow space for manufacturing deviations and improve process feasibility. The upper plate 303 of the longitudinal beam is provided with a welding hole 320 at the position where it mates with the overlapping flange 314. The opening length of the welding hole 320 is reserved according to the actual welding length. In this embodiment, the reinforcing bracket 313 is first welded to the lower plate 304 of the longitudinal beam, then the upper plate 303 of the longitudinal beam is welded to the lower plate 304 of the longitudinal beam, and finally the upper plate 303 of the longitudinal beam and the overlapping flange 314 of the reinforcing bracket 313 are welded through the welding hole 320.
[0036] In some embodiments, see Figure 1 , Figure 3 The left longitudinal beam 301 and right longitudinal beam 302 have a first vehicle body mounting point interface 315 in front of the recessed area 305, and a second vehicle body mounting point interface 316 and a third vehicle body mounting point interface 317 behind the recessed area 305. The left and right longitudinal beams 301 and 302 have a total of six vehicle body mounting point interfaces, enabling six-point fixed installation with the vehicle body. The latter two points are particularly well-positioned behind the subframe, significantly enhancing collision performance and protecting the battery pack from impact during a collision, thus greatly improving collision safety requirements.
[0037] In some embodiments, see Figure 1 The front crossbeam 100 includes an extruded square tube. A left longitudinal beam 301 is fitted between the upper longitudinal beam plate 303 and the lower longitudinal beam plate 304 and welded to the first insertion interface 318 at the left end of the extruded square tube. A right longitudinal beam 302 is fitted between the upper longitudinal beam plate 303 and the lower longitudinal beam plate 304 and welded to the second insertion interface 319 at the right end of the extruded square tube. This technical solution optimizes weight, cost, and functionality through reasonable structural design. With ingenious component structure and basic stamping and welding processes, the various functions of the subframe can be achieved.
[0038] In some embodiments, see Figure 1 , Figure 3 The rear crossbeam 200 is equipped with a rear suspension mounting bracket and a steering gear mounting bracket. The rear suspension mounting bracket includes a first bracket plate 201 and a second bracket plate 202, forming a U-shaped space between them. The edges of the first bracket plate 201 and the second bracket plate 202 are provided with flanges 203 that curl towards the back of the U-shaped space to enhance strength. The steering gear mounting bracket includes a third bracket plate 204, which is located on the back of the second bracket plate 202 and welded to it as a single unit. The third bracket plate 204, through its irregularly shaped structure, achieves seamless welding with the rear suspension mounting bracket, meeting the requirements of stamping and welding processes. This also enhances the strength of the rear suspension and steering gear mounting interface, improves local rigidity, and significantly improves the overall vehicle NV performance.
[0039] An embodiment of this utility model also provides an automobile, including the front subframe of any of the above embodiments.
[0040] In the description of this specification, references to terms such as "example," "embodiment," or "some embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0041] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.
Claims
1. A front subframe, characterized in that, It includes a front crossbeam, a rear crossbeam, a left longitudinal beam, and a right longitudinal beam. The left and right longitudinal beams are symmetrically arranged. Each of the left and right longitudinal beams includes an upper plate and a lower plate. The upper and lower plates extend longitudinally. At least one of the upper and lower plates has a folded edge. The upper and lower plates are welded together through the folded edge to form a box-shaped structure with an inner cavity. A recessed area is formed in the middle of the upper plate by setting a corner fold line.
2. The front subframe according to claim 1, characterized in that, The upper plate of the longitudinal beam has a front inclined surface, a bottom plane and a rear inclined surface in the concave area. The top surface of the upper plate of the longitudinal beam located on the front side of the concave area extends downward to the bottom plane through the front inclined surface, forming a first corner line between the front inclined surface and the bottom plane. The top surface of the upper plate of the longitudinal beam located on the rear side of the concave area extends downward to the bottom plane through the rear inclined surface, forming a second corner line between the rear inclined surface and the bottom plane.
3. The front subframe according to claim 2, characterized in that, The upper plate of the longitudinal beam has a first folded edge that bends downward on both sides, and the lower plate of the longitudinal beam has a second folded edge that bends upward on both sides. The upper plate and the lower plate of the longitudinal beam are fastened together, and the first folded edge overlaps and is welded to the second folded edge.
4. The front subframe according to claim 3, characterized in that, The upper plate of the longitudinal beam is formed with the corner fold line and the first fold edge by stamping the sheet metal, and the lower plate of the longitudinal beam is formed with the second fold edge by stamping the sheet metal.
5. The front subframe according to claim 1, characterized in that, The box-shaped structure has a reinforcing bracket located behind the recessed area. The lower end of the reinforcing bracket is welded to the lower plate of the longitudinal beam, and the upper end of the reinforcing bracket is welded to the upper plate of the longitudinal beam.
6. The front subframe according to claim 5, characterized in that, The upper end of the reinforcing bracket is provided with an overlapping flange bent to one side, the upper plate of the longitudinal beam is clearance-fitted with the overlapping flange, and the upper plate of the longitudinal beam is provided with welding holes at the position where it mates with the overlapping flange.
7. The front subframe according to claim 1, characterized in that, The left and right longitudinal beams are provided with a first vehicle body mounting point interface in front of the recessed area, and the left and right longitudinal beams are provided with a second and a third vehicle body mounting point interface behind the recessed area.
8. The front subframe according to claim 1, characterized in that, The front crossbeam includes an extruded square tube, the left longitudinal beam forms a first insertion interface between the upper plate and the lower plate of the longitudinal beam and is welded to the left end of the extruded square tube, and the right longitudinal beam forms a second insertion interface between the upper plate and the lower plate of the longitudinal beam and is welded to the right end of the extruded square tube.
9. The front subframe according to claim 1, characterized in that, The rear crossbeam is provided with a rear suspension mounting bracket and a steering gear mounting bracket. The rear suspension mounting bracket includes a first bracket plate and a second bracket plate, and a U-shaped space is formed between the first bracket plate and the second bracket plate. The edges of the first bracket plate and the second bracket plate are provided with flanges that curl toward the back side of the U-shaped space. The steering gear mounting bracket includes a third bracket plate, which is located on the back side of the second bracket plate and is welded to the second bracket plate as a whole.
10. A car, characterized in that, Includes the front subframe as described in any one of claims 1 to 9.