A front subframe assembly for automobiles

Abstract

This invention discloses a front subframe assembly for automobiles, belonging to the field of automobile chassis technology. It includes a subframe body, with a longitudinal beam fixedly connected to each side of the subframe body. A crossbeam connects the two longitudinal beams, and mounting brackets are fixedly installed at the connecting corners of the longitudinal beams and the crossbeams. The longitudinal beams have a variable cross-section structure, with the longitudinal direction of the longitudinal beams being curved and the cross-section of the longitudinal beams being variable.

Description

Technical Field

[0001] This invention belongs to the field of automotive chassis technology, specifically relating to a front subframe assembly for automobiles. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] The front subframe is an important component that connects the car body and the suspension. While improving the rigidity of the car body, the front subframe also supports the powertrain.

[0004] Currently, the market is moving towards new energy vehicles, and the power system is rapidly iterating from internal combustion engines to electric motors or hybrids. The existing front subframe structure is generally "ingot-type" or "full-frame type". The "full-frame type" is composed of two longitudinal beams on the left and right and a cross beam bolted to the "ingot-type" subframe. The connection between the longitudinal beams and the cross beam is a single layer of sheet metal bonded to the bolts, without forming a closed space. The structural strength and modal characteristics are relatively low. The power system vibrates during operation, and the existing subframe is prone to resonance, reducing comfort. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a front subframe assembly for automobiles that can improve overall modal performance.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] In a first aspect, the present invention provides a front subframe assembly for an automobile, including a subframe body, wherein both sides of the subframe body are fixedly connected to a longitudinal beam, and a crossbeam is connected between the two longitudinal beams, and a mounting bracket is fixedly installed at the connecting corner of the longitudinal beam and the crossbeam; the longitudinal beam is a variable cross-section structure, the longitudinal direction of the longitudinal beam is curved, and the cross-section of the longitudinal beam is variable cross-section.

[0008] As a further technical solution, one end of the longitudinal beam is fixedly connected to the subframe body, and the other end of the longitudinal beam has a corner. One side of the corner is fixedly connected to the crossbeam, and the other side of the corner is fixedly connected to the mounting bracket.

[0009] As a further technical solution, the cross-section of the longitudinal beam near the subframe body is shaped like the number 7, and the cross-section of the longitudinal beam near the crossbeam is rectangular. The cross-sectional area of ​​the longitudinal beam gradually decreases from the subframe body to the crossbeam, and the cross-section of the longitudinal beam forms an irregular cavity shape.

[0010] As a further technical solution, the sidewall of the longitudinal beam is curved, the two longitudinal beams are symmetrically arranged, and the distance between the two longitudinal beams gradually increases from the subframe body to the crossbeam.

[0011] As a further technical solution, the longitudinal beam includes an upper longitudinal beam plate and a lower longitudinal beam plate arranged opposite each other, with the edges of the upper and lower longitudinal beam plates overlapping, and the overlap point of the two being fixedly connected to form a whole.

[0012] As a further technical solution, the cross-sections of the upper and lower plates of the longitudinal beam are both curved, and the longitudinal sections of the upper and lower plates of the longitudinal beam are of variable cross-section form.

[0013] As a further technical solution, the upper plate of the longitudinal beam is a C-shaped structure with an opening facing downwards, and the lower plate of the longitudinal beam is a curved structure with an opening facing upwards.

[0014] As a further technical solution, the subframe body includes a subframe lower plate, a longitudinal beam upper plate and a longitudinal beam lower plate sandwiching the subframe lower plate between the two, and the welding positions of the longitudinal beam upper plate, the longitudinal beam lower plate and the subframe lower plate are staggered.

[0015] As a further technical solution, the upper longitudinal beam plate is longer than the lower longitudinal beam plate, the upper longitudinal beam plate is placed on top of the lower subframe plate, and the rear section of the upper longitudinal beam plate is fixed to the lower subframe plate as the upper subframe plate; the lower longitudinal beam plate is placed at the bottom of the lower subframe plate, and the lower longitudinal beam plate overlaps and is fixed to the lower subframe plate; the front section of the upper longitudinal beam plate is fixedly connected to the lower longitudinal beam plate.

[0016] As a further technical solution, a shrinkage groove is provided in the middle of the longitudinal beam, which is a groove formed on the surface of the longitudinal beam.

[0017] The beneficial effects of the present invention are as follows:

[0018] The front subframe assembly of the present invention designs the longitudinal beam body as a 7-shaped variable cross-section closed space structure. While ensuring that the strength and durability requirements are met, the stiffness of the subframe can be improved, and the overall modality of the front subframe can be effectively improved. This will cause the resonance zone between the front subframe and the powertrain to be offset, eliminate the resonance phenomenon, and improve the driving comfort of the car.

[0019] The front subframe assembly of the present invention sets the lengths of the upper and lower longitudinal beams to be different, and staggers the welding positions of the upper and lower longitudinal beams and the subframe body, which can improve the bending and torsional resistance of the front subframe assembly.

[0020] The front subframe assembly of the present invention has grooves formed on the surface of the longitudinal beams to create crumple zones, which can cause the longitudinal beams to collapse in the event of a collision, absorb impact energy, and improve collision safety. Attached Figure Description

[0021] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0022] Figure 1 This is a schematic diagram of the front subframe assembly of the automobile of the present invention;

[0023] Figure 2 This is a schematic diagram of the longitudinal beam of the front subframe assembly of the automobile of the present invention;

[0024] Figure 3a This is a cross-sectional view of the longitudinal beam AA of the front subframe assembly of the automobile of the present invention;

[0025] Figure 3b This is a cross-sectional view of the longitudinal beam BB of the front subframe assembly of the automobile of the present invention;

[0026] Figure 3c This is a cross-sectional view of the longitudinal beam of the front subframe assembly of the automobile of the present invention (CC section).

[0027] Figure 4 This is a schematic diagram showing the cooperation between the upper longitudinal beam plate, the lower longitudinal beam plate, and the lower subframe plate of the present invention;

[0028] In the diagram: 1. Subframe body, 2. Left longitudinal beam, 3. Left front mounting bracket, 4. Front crossbeam, 5. Right front mounting bracket, 6. Right longitudinal beam, 7. Crushing groove, 8. First section, 9. Second section, 10. Third section, 11. Subframe lower plate, 12. Longitudinal beam upper plate, 13. Longitudinal beam lower plate, 111. Connection position, 112. Connection position, 113. Connection position, 114. Connection position.

[0029] The distances or dimensions between parts have been exaggerated to show their positions; the diagram is for illustrative purposes only. Detailed Implementation

[0030] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0031] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0032] For ease of description, the words "up," "down," "left," and "right" appearing in this invention only indicate that they are consistent with the up, down, left, and right directions of the accompanying drawings themselves, and do not limit the structure. They are merely for the purpose of facilitating the description of this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] Terminology Explanation: In this invention, terms such as “installation,” “connection,” “linking,” and “fixing” should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction relationship between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] In a typical embodiment of the present invention, such as Figure 1 As shown, a front subframe assembly for automobiles is proposed, which includes a subframe body 1. Both sides of the subframe body 1 are fixedly connected to a longitudinal beam, and a crossbeam is connected between the two longitudinal beams. Mounting brackets are fixedly installed at the corners where the longitudinal beams and the crossbeams connect.

[0035] Specifically, the subframe body 1 includes a subframe lower plate 11, with both sides of one end of the subframe lower plate 11 fixedly connected to a longitudinal beam. Two opposing longitudinal beams are provided, such as... Figure 1 One side of the subframe lower plate 11 is fixedly connected to the left longitudinal beam 2, and the other side of the subframe lower plate 11 is fixedly connected to the right longitudinal beam 6. The left longitudinal beam 2 and the right longitudinal beam 6 are opposite to each other and spaced apart.

[0036] It should be noted that the left longitudinal beam 2 and the right longitudinal beam 6 are symmetrically arranged with respect to the center line of the subframe lower plate 11, which can improve the stability of the overall structure.

[0037] A front crossbeam 4 is fixedly installed between the ends of the left longitudinal beam 2 and the right longitudinal beam 6. The front crossbeam 4 is set approximately perpendicular to the left longitudinal beam 2 and the right longitudinal beam 6. The front crossbeam 4 is set parallel to the subframe lower plate 11. The subframe lower plate 11, the left longitudinal beam 2, the right longitudinal beam 6 and the front crossbeam 4 together form a frame structure.

[0038] A left front mounting bracket 3 is installed at the corner where the left longitudinal beam 2 and the front crossbeam 4 connect. The left front mounting bracket 3 is fixedly connected to the ends of both the left longitudinal beam 2 and the front crossbeam 4. A right front mounting bracket 5 is installed at the corner where the right longitudinal beam 6 and the front crossbeam 4 connect. The right front mounting bracket 5 is fixedly connected to the ends of both the left longitudinal beam 2 and the front crossbeam 4. Each of the left bracket 3 and the right bracket 5 includes a mounting hole, providing one mounting point on the left and one on the right for the front subframe.

[0039] In the specific setup, the lower plate 11 of the subframe, the left longitudinal beam 2, and the right longitudinal beam 6 are all connected by welding.

[0040] The front crossbeam 4 is fixedly connected to the left longitudinal beam 2 and the right longitudinal beam 6. Specifically, the left longitudinal beam 2 is welded to the front crossbeam 4 and the left front mounting bracket 3, and the right longitudinal beam 6 is welded to the front crossbeam 4 and the right front mounting bracket 5. A bracket is installed on the front crossbeam 4 to provide mounting points for the powertrain.

[0041] In a preferred embodiment, such as Figure 2 , Figure 3a , Figure 3b , Figure 3c As shown, the longitudinal beams are designed as variable cross-section structures. In order to enable the front subframe to have high modal performance, while ensuring that the strength and durability requirements are met, the longitudinal beams are designed as 7-shaped variable cross-section structures. The design of the longitudinal beam structure shape and size effectively improves the overall modality of the front subframe.

[0042] like Figure 2 The longitudinal beams are curved in the longitudinal direction. One end of the longitudinal beam is fixedly connected to the subframe body 1, and the other end of the longitudinal beam has a corner. One side of the corner is fixedly connected to the front crossbeam, and the other side of the corner is fixedly connected to the mounting bracket. Specifically, one end of the left longitudinal beam 2 and the right longitudinal beam 6 are fixedly connected to the lower plate 11 of the subframe. One side of the corner of the left longitudinal beam 2 and the right longitudinal beam 6 is fixedly connected to the front crossbeam 4. The other side of the corner of the left longitudinal beam 2 is fixedly connected to the left front mounting bracket 3, and the other side of the corner of the right longitudinal beam 6 is fixedly connected to the right front mounting bracket 5.

[0043] The sidewalls of the longitudinal beams are curved, and the left and right longitudinal beams are symmetrically arranged, with the spacing between the left and right longitudinal beams gradually increasing from the subframe body to the crossbeam.

[0044] The longitudinal beam has a variable cross-section, meaning both its cross-sectional area and shape vary. The cross-section near the subframe body 1 is L-shaped, while the cross-section near the front crossbeam 4 is rectangular. Figures 3a-3c As shown, the cross-section of the longitudinal beam changes from a "7" shape (CC section) to a rectangle (AA section). The cross-sectional area of ​​the longitudinal beam gradually decreases from the subframe body to the crossbeam. Through this variable cross-section design, the overall modal characteristics and stiffness of the subframe are improved. Figure 2 , Figures 3a-3c As shown, the cross-sectional areas of the third section 10, the second section 9, and the first section 8 of the longitudinal beam gradually decrease, and the cross-section of the longitudinal beam forms an irregular cavity, which is a closed space structure.

[0045] like Figure 4 As shown, the longitudinal beam includes an upper longitudinal beam plate 12 and a lower longitudinal beam plate 13 arranged opposite each other; as Figures 3a-3cAs shown, the longitudinal beam is hollow. Both the upper and lower plates 12 and 13 of the longitudinal beam have curved cross-sections, and their longitudinal sections are variable. The upper plate 12 has a downward-opening C-shape, while the lower plate 13 has an upward-opening curved shape. The upper and lower plates 12 overlap and are fixedly connected. The upper and lower plates 12 and 13 form a closed cavity.

[0046] Specifically, the edges of the upper plate 12 and the lower plate 13 of the longitudinal beam overlap, and the overlap is welded together to form a whole.

[0047] It should be noted that the upper longitudinal beam plate 12 and the lower longitudinal beam plate 13 are formed by stamping and bending, and the upper and lower longitudinal beam plates are welded to form an irregular cavity cross section, which effectively improves the overall mode of the front subframe.

[0048] like Figure 4 As shown, the upper longitudinal beam plate 12 and the lower longitudinal beam plate 13 sandwich the lower subframe plate 11 in the middle. The upper longitudinal beam plate 12 is longer than the lower longitudinal beam plate 13. The upper longitudinal beam plate 12 is placed on top of the lower subframe plate 11, and the rear section of the upper longitudinal beam plate 12 is welded to the lower subframe plate 11 as the upper subframe plate. The lower longitudinal beam plate 13 is placed at the bottom of the lower subframe plate 11, and the lower longitudinal beam plate 13 overlaps and is welded to the lower subframe plate 11. The front section of the upper longitudinal beam plate 12 is connected to the lower longitudinal beam plate 13 by welding.

[0049] The upper longitudinal beam plate 12 is welded to the lower subframe plate 11, with weld beads distributed at connection positions 111, 112, 113, and 114 of the lower subframe plate 11; the lower longitudinal beam plate 13 is welded to the lower subframe plate 11, with weld beads distributed at connection position 111 of the lower subframe plate 11. Due to their different lengths, the upper longitudinal beam plate 12 and the lower longitudinal beam plate 13 are staggered when welded to the lower subframe plate 11.

[0050] The upper longitudinal beam plate 12 is designed as the maximum plate boundary, and the lower longitudinal beam plate 13 is designed as the minimum plate boundary. The upper and lower longitudinal beam plates have different lengths, and the welding positions of the upper and lower longitudinal beam plates and the lower subframe plate are staggered, which increases the overlap area of ​​the welding, lengthens the weld bead, and makes the distribution more reasonable, effectively improving the welding strength. At the same time, it avoids the weld bead from being concentrated in one place, causing stress concentration and welding deformation. Through the above design, the bending and torsional resistance of the front subframe assembly can be improved.

[0051] In a preferred embodiment, in order to improve the overall vehicle collision safety, a crumple zone 7 is provided in the middle of the longitudinal beam. The crumple zone 7 is opened on the surface of the longitudinal beam. When the vehicle is involved in a head-on collision, the crumple zone causes the longitudinal beam to crumple and deform, absorbing the impact energy of the collision and improving collision safety.

[0052] Specifically, a groove is made in the middle of the surface of the upper plate 12 of the longitudinal beam to form a crumple groove 7. The crumple groove 7 can be in the form of a semi-circular or arc-shaped groove, which causes the longitudinal beam to crumple and absorb the impact energy when it is hit.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A front subframe assembly for an automobile, characterized in that, The vehicle includes a subframe body, with each side of the subframe body fixedly connected to a longitudinal beam. A crossbeam connects the two longitudinal beams, and mounting brackets are fixedly installed at the corners where the longitudinal beams and the crossbeams connect. The longitudinal beams are variable cross-section structures, with the longitudinal direction of the longitudinal beams being curved and the cross-section of the longitudinal beams being variable cross-sections. The longitudinal beam includes an upper longitudinal beam plate and a lower longitudinal beam plate arranged opposite each other. The edges of the upper longitudinal beam plate and the lower longitudinal beam plate overlap, and the overlap is fixedly connected to form a whole. The subframe body includes a subframe lower plate, a longitudinal beam upper plate and a longitudinal beam lower plate sandwiching the subframe lower plate between the two, and the welding positions of the longitudinal beam upper plate, the longitudinal beam lower plate and the subframe lower plate are staggered. The upper longitudinal beam plate is longer than the lower longitudinal beam plate. The upper longitudinal beam plate is placed on top of the lower subframe plate, and the rear section of the upper longitudinal beam plate is fixed to the lower subframe plate as the upper subframe plate. The lower longitudinal beam plate is placed at the bottom of the lower subframe plate, and the lower longitudinal beam plate overlaps and is fixed to the lower subframe plate. The front section of the upper longitudinal beam plate is fixedly connected to the lower longitudinal beam plate.

2. The automotive front subframe assembly as described in claim 1, characterized in that, One end of the longitudinal beam is fixedly connected to the subframe body, and the other end of the longitudinal beam has a corner. One side of the corner is fixedly connected to the crossbeam, and the other side of the corner is fixedly connected to the mounting bracket.

3. The automotive front subframe assembly as described in claim 1, characterized in that, The longitudinal beam has a 7-shaped cross-section near the subframe body and a rectangular cross-section near the crossbeam. The cross-sectional area of ​​the longitudinal beam gradually decreases from the subframe body to the crossbeam, and the cross-section of the longitudinal beam forms an irregular cavity shape.

4. The automotive front subframe assembly as described in claim 3, characterized in that, The sidewalls of the longitudinal beams are curved, the two longitudinal beams are symmetrically arranged, and the distance between the two longitudinal beams gradually increases from the subframe body to the crossbeam.

5. The automotive front subframe assembly as described in claim 1, characterized in that, The cross-sections of the upper and lower plates of the longitudinal beam are both curved, and the longitudinal sections of the upper and lower plates are of variable cross-section.

6. The automotive front subframe assembly as described in claim 5, characterized in that, The upper plate of the longitudinal beam has a downward-opening C-shaped structure, while the lower plate of the longitudinal beam has an upward-opening curved structure.

7. The automotive front subframe assembly as described in claim 1, characterized in that, A shrinkage groove is provided in the middle of the longitudinal beam, which is a groove formed on the surface of the longitudinal beam.

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