An extendable sub-frame structure, vehicle and working method

Abstract

The application discloses an extensible auxiliary frame structure, a vehicle and a mounting method, relates to the technical field of automobiles, and solves the problem of poor compatibility of an auxiliary frame to a motor size in the prior art, has the beneficial effects of reasonable space utilization and compatibility with more motors, and specifically has the following arrangement: an extensible auxiliary frame structure comprises an auxiliary frame body, the auxiliary frame body is formed into a frame structure through a cross beam and a longitudinal beam, the longitudinal beam of the auxiliary frame body is arranged to be higher than the cross beam, a positioning portion is arranged on the part of the longitudinal beam that is higher than the cross beam, at least one detachable cross beam can be mounted on the auxiliary frame body through the positioning portion at the longitudinal beam, the detachable cross beam is arranged with a suspension support, the auxiliary frame body is arranged with a suspension mounting portion, suspension mounting of a motor is realized through the suspension mounting portion and the suspension support, the detachable cross beam is arranged above one of the cross beams, the detachable cross beam is arranged to be staggered with the cross beam below, and the detachable cross beam has multiple choices.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobiles, especially electric vehicles, and in particular to an extensible subframe structure, a vehicle and a working method. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] The subframe can be regarded as the skeleton of the front and rear axles and is a component of the front and rear axles. The subframe is not a complete frame, but only a support for the front and rear axles and suspension, so that the axles and suspension are connected to the "main frame" through the subframe.

[0004] With the development of the times, the progress of science and technology, and the increasingly stringent environmental protection requirements, range-extended (REEV) vehicles, hybrid (PHEV) vehicles and pure electric (BEV) vehicles are becoming the mainstream of the automotive industry. In order to reduce the overall cost or to meet the needs of various configuration gradients, major automakers often install multiple motors on the same platform or the same vehicle model. The differences in motor size and torque will inevitably result in differences in boundary dimensions, which affect the boundaries of the subframe through the suspension system, making the platform development of the subframe difficult. That is, the existing subframe has poor compatibility with motor size and torque, and the subframe is a fixed structure. In some schemes, holes are drilled directly in the subframe to install the motor, making it difficult for the subframe to meet the requirements of suspension mounting point dynamic stiffness, constraint modal and other NVH (noise, vibration and harshness) performance requirements, further affecting the platformization, generalization and research and development cost investment of the vehicle.

[0005] There are also existing technologies that improve the subframe for motor installation, such as Chinese patent application CN202420873442.6, filed on April 25, 2024, which discloses a platformized front subframe for suspension power systems. The subframe is provided with a subframe front cross beam, and the subframe front cross beam is provided with a suspension mounting position for installing a motor. However, the subframe front cross beam is fixedly connected to the subframe body and serves as one of the cross beams of the subframe body. This affects the arrangement of structural components originally installed on the subframe body and results in insufficient space utilization. SUMMARY

[0006] In view of the deficiencies of the prior art, the present application aims to provide an extensible subframe structure to provide a solution for the platform development of the subframe.

[0007] To achieve the above-mentioned purpose, the present application is implemented by the following technical solutions:

[0008] An extendable subframe structure, comprising a subframe body, the subframe body is formed into a frame type structure by beams and longitudinal beams, the longitudinal beams of the subframe body are higher than the beams, the part of the longitudinal beams higher than the beams is provided with a positioning part, at least one detachable beam is installed on the subframe body through the positioning part at both sides of the longitudinal beams, the detachable beam is provided with a suspension support, the subframe body is provided with a suspension mounting part, the suspension mounting of the motor is realized through the suspension mounting part and the suspension support, the detachable beam is above one of the beams, and the detachable beam is arranged in a staggered manner with the beam below.

[0009] The extendable subframe structure as described above, in order to ensure versatility, the detachable beam has multiple options, the positions of the suspension supports of different detachable beams are different, or the numbers of the suspension supports are different, or the structures of the suspension supports are different, and a suitable detachable beam is selected according to the motor to be installed.

[0010] The extendable subframe structure as described above, considering that the sizes of the motors are different, in order to further meet the demand and maximize the platformization of the subframe structure, the detachable beam is concave towards the center of the subframe body to install a motor with a relatively small size;

[0011] Alternatively, the detachable beam is convex away from the center of the subframe body to install a motor with a relatively large size, the convex detachable beam ensures the space between the subframe body and the detachable beam, which can be used to install a motor with a large size.

[0012] The extendable subframe structure as described above, one end of the longitudinal beam is provided in an L shape, the horizontal section of the L-shaped end of the longitudinal beam is connected with the beam, and the vertical section of the L-shaped end of the longitudinal beam is provided with the positioning part, so that the space is fully utilized, and the detachable beam is above the beam on one side of the subframe body, and does not interfere with the installation of the structural member at the beam.

[0013] The extendable subframe structure as described above, the positioning part is a positioning boss, a first hole is arranged at the positioning part, and a second hole is arranged at each end of the detachable beam, a fastener passes through the second hole and the first hole to fasten the detachable beam to the subframe body.

[0014] The extendable subframe structure as described above, in order to avoid interference between the original component at the subframe and the detachable beam, the distance between the detachable beam and the center of the subframe body is less than the distance between the beam below the detachable beam and the center of the subframe body.

[0015] The suspension mounting part is arranged at a beam of the subframe body away from the detachable beam, so as to ensure stable support of the motor.

[0016] The height of the middle part of the detachable cross beam is greater than the height of the two sides of the detachable cross beam, at least one suspension bushing mounting hole is arranged in the detachable cross beam, a suspension bushing is arranged in the suspension bushing mounting hole, and the suspension bracket is tightly connected with the suspension bushing.

[0017] In order to control the weight of the detachable cross beam, the detachable cross beam is internally hollow, the detachable cross beam is provided with a reinforcing rib on the side of the suspension bushing mounting hole, and the detachable cross beam is covered with a protective layer on the outside.

[0018] The side of the suspension bracket away from the detachable cross beam is arc-shaped, at least three third holes are arranged on the arc-shaped side of the suspension bracket, and the adjacent two third holes are arranged at a distance.

[0019] The side of the suspension bracket away from the detachable cross beam is arc-shaped, at least three third holes are arranged on the arc-shaped side of the suspension bracket, and the adjacent two third holes are arranged at a distance.

[0020] The side of the suspension bracket away from the detachable cross beam is arc-shaped, at least three third holes are arranged on the arc-shaped side of the suspension bracket, and the adjacent two third holes are arranged at a distance.

[0021] The side of the suspension bracket away from the detachable cross beam is arc-shaped, at least three third holes are arranged on the arc-shaped side of the suspension bracket, and the adjacent two third holes are arranged at a distance.

[0022] The side of the suspension bracket away from the detachable cross beam is arc-shaped, at least three third holes are arranged on the arc-shaped side of the suspension bracket, and the adjacent two third holes are arranged at a distance.

[0023] The side of the suspension bracket away from the detachable cross beam is arc-shaped, at least three third holes are arranged on the arc-shaped side of the suspension bracket, and the adjacent two third holes are arranged at a distance.

[0024] The side of the suspension bracket away from the detachable cross beam is arc-shaped, at least three third holes are arranged on the arc-shaped side of the suspension bracket, and the adjacent two third holes are arranged at a distance.

[0025] The side of the suspension bracket away from the detachable cross beam is arc-shaped, at least three third holes are arranged on the arc-shaped side of the suspension bracket, and the adjacent two third holes are arranged at a distance.

[0026] The side of the suspension bracket away from the detachable cross beam is arc-shaped, at least three third holes are arranged on the arc-shaped side of the suspension bracket, and the adjacent two third holes are arranged at a distance.

[0027] 1) The subframe structure in the application, the subframe body is provided with a positioning part, the detachable cross beam can be installed on the subframe body through the positioning part, the detachable cross beam provides a suspension support, the subframe body is provided with a suspension mounting part, so that the subframe body can be placed on the side of the original motor, and the upper space of the subframe body is used to realize stable installation of the suspension motor, meet the demand of carrying multiple different size or wheel end torque motors on the same platform or the same vehicle model, improve the platformization and generalization degree of the subframe, reduce the research and development cost investment, and the detachable cross beam is placed above the one side cross beam to avoid interference with the installation of the cross beam upper component.

[0028] 2) The detachable cross beam in the application can be installed on the subframe body and provide a suspension support for connecting with the motor, without drilling holes on the subframe body, the increased motor is stably installed through the suspension support and the suspension mounting part, so that the dynamic stiffness and modal of the vehicle driving end are maximized, the vibration isolation performance of the motor is improved, and the whole vehicle NVH performance is improved.

[0029] 3) The detachable cross beam in the application can be concave towards the center of the subframe body or convex towards the outside of the subframe body, the detachable cross beam can have multiple choices, suitable detachable cross beams can be selected according to the expected installed motor, different size motors are compatible with small cost investment, the generalization and platformization degree of the subframe is high, and the research and development investment of the subframe is greatly reduced, such as mold and labor cost; the selection of concave or convex of the detachable cross beam and the change of the number of suspension supports meet the demand of motors with large and small wheel end torque on the premise of considering the cost.

[0030] 4) In the application, the structure characteristics of the longitudinal beam in the subframe body are utilized, the positioning part is reasonably arranged, the upper space of the subframe body is effectively utilized to realize suspension installation of the increased motor, the structure stiffness of the original subframe body is not affected, and interference with the structure component at the cross beam of the subframe body is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0031] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the exemplary embodiments of the application, serve to explain the application, and do not constitute an improper limitation on the application.

[0032] Figure 1 is a schematic diagram of an expandable subframe structure according to one or more embodiments of the application Figure One .

[0033] Figure 2 is a schematic diagram of an expandable subframe structure according to one or more embodiments of the application Figure Two .

[0034] Figure 3is a front view of an extendable subframe structure according to one or more embodiments of the present invention.

[0035] Figure 4 is a front view of a detachable cross beam in an extendable subframe structure according to one or more embodiments of the present invention.

[0036] Figure 5 is a schematic view of a suspension bracket in an extendable subframe structure according to one or more embodiments of the present invention.

[0037] Figure 6 is a schematic view of a suspension bracket mounted to a detachable cross beam in an extendable subframe structure according to one or more embodiments of the present invention. Figure One .

[0038] Figure 7 is a schematic view of a suspension bracket mounted to a detachable cross beam in an extendable subframe structure according to one or more embodiments of the present invention. Figure Two .

[0039] In the drawings: the mutual spacing or dimensions are exaggerated for showing the positions of the parts, and the schematic views are merely illustrative.

[0040] wherein: 1, detachable cross beam, 2, suspension bracket, 3, suspension bushing, 4, subframe body, 5. suspension mounting portion, 6. first bolt, 7. second bolt;

[0041] 1-1, reinforcing rib, 1-2, suspension bushing mounting hole, 1-3, second opening;

[0042] 2-1, fourth opening, 2-2, third opening;

[0043] 4-1, positioning portion, 4-2, first cross beam, 4-3, first longitudinal beam, 4-4, second longitudinal beam, 4-5, second cross beam, 4-6, third cross beam;

[0044] 5-1, first mounting bracket, 5-2, second mounting bracket. DETAILED DESCRIPTION

[0045] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0046] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0047] As introduced in the background, the compatibility of the subframe in the prior art is poor, in order to solve the above technical problems, the present application provides a scalable subframe structure.

[0048] Embodiment one

[0049] In a typical embodiment of the present application, referring to Figure 1 , Figure 2 and Figure 3 , a scalable subframe structure includes a subframe body 4, the subframe body 4 is formed by a cross beam and a longitudinal beam to form a frame structure, the longitudinal beam of the subframe body 4 is higher than the cross beam, the part of the longitudinal beam higher than the cross beam is provided with a positioning part, at least one detachable cross beam 1 is installed on the subframe body through the positioning part 4-1 at both sides of the longitudinal beam, the detachable cross beam 1 is provided with a suspension bracket 2, the subframe body 4 is provided with a suspension mounting part 5, the suspension mounting part 5 and the suspension bracket 2 realize the suspension mounting of the motor, the detachable cross beam is above one of the cross beams, and the detachable cross beam is arranged in a staggered manner with the cross beam below it.

[0050] Specifically, the subframe body 4 is provided with two suspension mounting parts 5, both of which are installed on the subframe body 4 away from the detachable cross beam 1 at one cross beam, so as to ensure stable support for the motor.

[0051] Referring to Figure 2 , the subframe body 4 includes a first cross beam 4-2, both ends of the first cross beam 4-2 are connected with a first longitudinal beam 4-3 and a second longitudinal beam 4-4 respectively, one end of the first longitudinal beam 4-3 and the second longitudinal beam 4-4 away from the first cross beam is connected with a second cross beam, the one end of the first longitudinal beam 4-3 and the second longitudinal beam 4-4 away from the first cross beam is provided with a positioning part, the second cross beam 4-5 is lower than the positioning part, the second cross beam 4-5 is lower than the first cross beam, the height of the middle part of the first longitudinal beam 4-3 and the second longitudinal beam 4-4 is greater than the height of both sides thereof, and a third cross beam 4-6 is further connected between the bottom sides of the first longitudinal beam and the second longitudinal beam;

[0052] In this embodiment, the first crossbeam 4-2 is provided with two suspension mounting parts 5, which are spaced apart. Each suspension mounting part 5 includes a first mounting bracket 5-1 and a second mounting bracket 5-2 arranged opposite to each other. The first mounting bracket 5-1 has a through hole, and the second mounting bracket 5-2 has a threaded hole. The first mounting bracket is a vertical bracket that is perpendicular to the first crossbeam. The second mounting bracket 5-2 protrudes from the first crossbeam. The first mounting bracket 5-1 and the second mounting bracket 5-2 have a set height. The thickness of the second mounting bracket is greater than that of the first mounting bracket. The second mounting bracket is connected to the first longitudinal beam or the second longitudinal beam as a whole to enhance the overall structural rigidity.

[0053] It is easy to understand that, in order to avoid interference between the original components at the subframe and the detachable crossbeam 1, the distance between the detachable crossbeam 1 and the center of the subframe body 4 is less than the distance between the second crossbeam 4-5 below it and the center of the subframe body 4, and the length of the second crossbeam 4-5 below the detachable crossbeam is greater than the length of the detachable crossbeam.

[0054] It should be noted that one end of the first longitudinal beam 4-3 and the second longitudinal beam 4-4 is set in an L-shape. The horizontal section of the L-shaped end of the longitudinal beam is connected to the crossbeam. The vertical section of the L-shaped end of the first longitudinal beam and the second longitudinal beam is provided with a positioning part. The positioning part protrudes in a direction away from the center of the subframe body 4. The positioning part is spaced apart from the second crossbeam. This makes full use of the space so that the detachable crossbeam 1 is located above the second crossbeam 4-5 of the subframe body and will not interfere with the installation of the structural components at the second crossbeam.

[0055] Specifically, the positioning part 4-1 is a positioning boss, and a first opening is provided at the positioning part 4-1. The first opening is a threaded hole. Second openings 1-3 are provided at both ends of the detachable crossbeam. The second opening is a through hole. The length of the detachable crossbeam 1 is adapted to the distance between the two positioning parts. Fasteners such as the first bolt 6 pass through the second opening and the first opening to fasten the detachable crossbeam 1 to the subframe body 4.

[0056] Considering the differences in motor size, in order to further meet the requirements and maximize the platformization of the subframe structure, the detachable crossbeam 1 is recessed towards the center of the subframe body 4 so that a relatively small motor can be installed through the detachable crossbeam and the suspension mounting part.

[0057] Or, refer to Figure 6 As shown, the detachable crossbeam 1 protrudes outward away from the center of the subframe body 4 to install a relatively large motor. The outward protrusion of the detachable crossbeam 1 ensures the space between the subframe body and the detachable crossbeam 1. At this time, the middle section of the detachable crossbeam 1 is a connecting plate. The connecting plate and the connecting ear are connected by an arc segment. A second opening 1-3 is provided at the connecting ear. In this way, the detachable crossbeam and the suspension mounting part can be used to install a large motor.

[0058] To ensure the structural strength of the detachable cross beam, the height of the middle part of the detachable cross beam 1 is greater than the height of the two sides, that is, the height at the connecting lug is less than the height at the connecting plate, as shown in Figure 4 The detachable cross beam is provided with at least one suspension bush mounting hole 1-2, a suspension bush is mounted in the suspension bush mounting hole 1-2, one end of the suspension bracket 2 is provided with a fourth opening 2-1, which is a threaded hole, as shown in Figure 7 The second bolt 7 is fastened and connected through the suspension bush 2 and the fourth opening 2-1; the connecting plate of the detachable cross beam is provided with a suspension bush mounting hole 1-2, and the suspension bush 3 is placed in the suspension bush mounting hole 1-2 by press fitting, so that the detachable cross beam with the suspension bush is connected with the auxiliary frame body through a bolt, which is convenient for expansion, and the detachable cross beam with the suspension bush reduces the difficulty and cost of replacement after the suspension bush is damaged.

[0059] To control the weight of the detachable cross beam 1, the detachable cross beam 1 is internally hollow, the detachable cross beam is provided with a reinforcing rib 1-1 on the side of the suspension bush mounting hole, the reinforcing rib 1-1 can be a rice-shaped reinforcing rib, to ensure that there is enough strength and dynamic stiffness under the structure of a large-size suspension bush, reinforcing ribs 1-1 are arranged on both sides of the suspension bush mounting hole 1-2, and the outer side of the detachable cross beam 1 is covered with a protective layer, which is weldably connected with the detachable cross beam.

[0060] To ensure versatility, it is easy to understand that the detachable cross beam 1 has multiple options, the positions of the suspension brackets at different detachable cross beams are different, that is, the suspension bracket 2 can be arranged at the middle position or both sides of the detachable cross beam, or the number of suspension brackets at different detachable cross beams is different, that is, the number of suspension brackets 2 can be one or two, the number of suspension brackets can be adjusted according to the size of the electric drive wheel end torque or performance requirements, to meet the requirements of durability of suspension support and resistance to torsion of large-torque motors; or the structures of the suspension brackets 2 of different detachable cross beams are different, that is, the suspension bracket and the motor mounting hole, that is, the third opening, can be designed as three or four in combination with the existing bolt slip checking results, generally, a single suspension bracket selects a bolt with a larger diameter, such as a M14 bolt, and a double suspension bracket selects a 2×M12 bolt;

[0061] As shown in Figure 5 The suspension bracket 2 is in the shape of a trapezoidal block, a cylindrical part is arranged on the shorter side of the suspension bracket, a fourth opening 2-2 is arranged at the cylindrical part, the side of the suspension bracket away from the detachable cross beam is arc-shaped, at least three third openings 2-2 are arranged on the arc-shaped side of the suspension bracket 2, the center axes of the third openings 2-2 and the center axis of the fourth opening 2-1 are perpendicular to each other, the center axes of the third openings are parallel to the length direction of the detachable cross beam, the adjacent two third openings 2-2 are arranged at a distance, and the size of the suspension bracket can be designed flexibly in combination with the motor boundary, to further widen the compatibility of the auxiliary frame structure to the motor size.

[0062] The auxiliary frame structure provided by the embodiment is characterized in that the auxiliary frame body 4 is provided with a positioning part 4-1, the detachable cross beam can be installed at the auxiliary frame body through the positioning part, the detachable cross beam 1 provides a suspension support 2, the auxiliary frame body is provided with a suspension mounting part, so that the auxiliary frame body can be arranged at the side of the original motor, and the suspension motor can be stably installed by using the upper space of the auxiliary frame body, the dynamic stiffness and the mode of the driving end of the vehicle can be maximized, the vibration isolation performance at the motor is improved, the NVH performance of the whole vehicle is improved, a high-universal and high-platform auxiliary frame structure is provided, the auxiliary frame structure design scheme of the motor with a large size span can be compatible, and the material, the number, the specific position of the detachable cross beam, the number of the specific mounting points of the suspension bushing, and the number and position of the mounting points of the suspension support and the suspension mounting part are not required to be hard.

[0063] Embodiment two

[0064] The embodiment provides a vehicle adopting the expandable auxiliary frame structure.

[0065] Embodiment three

[0066] The embodiment provides an installation method of the expandable auxiliary frame structure, and the installation method comprises the following contents.

[0067] The positioning part 4-1 is arranged at the longitudinal beam of the auxiliary frame body 4 during the manufacturing process;

[0068] The detachable cross beam 1 is installed through the positioning parts at two longitudinal beams, and the detachable cross beam 1 is arranged above the second cross beam 4-5 after installation;

[0069] According to the motor to be installed, the appropriate detachable cross beam is selected, part of the motor is located at the center of the auxiliary frame body, the suspension installation of the additional motor is realized through the suspension mounting part and the suspension support at the detachable cross beam, and thus the stable installation of the additional motor by the auxiliary frame structure is realized.

[0070] The above only describes the preferred embodiments of the application and is not used to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A scalable subframe structure, characterized in that, The subframe body is composed of crossbeams and longitudinal beams to form a frame structure. The longitudinal beams of the subframe body are set higher than the crossbeams. The part of the longitudinal beams that are higher than the crossbeams is provided with a positioning part. At least one detachable crossbeam is installed on the subframe body through the positioning parts at the longitudinal beams on both sides. The detachable crossbeam is provided with a suspension bracket. The subframe body is provided with a suspension mounting part. The motor is suspended and installed through the suspension mounting part and the suspension bracket. The detachable crossbeam is located above one of the crossbeams. The detachable crossbeam is staggered with the crossbeam below it. The detachable crossbeam has multiple options, and the positions of the suspension brackets, the number of suspension brackets, or the structure of the suspension brackets are different at different detachable crossbeams. The appropriate detachable crossbeam is selected according to the motor to be installed. The detachable crossbeam is recessed towards the center of the subframe body to mount a relatively small motor; or, the detachable crossbeam is convex outward away from the center of the subframe body to mount a relatively large motor.

2. The expandable subframe structure according to claim 1, characterized in that, One end of the longitudinal beam is configured as an L-shape, the horizontal section of the L-shaped end of the longitudinal beam is connected to the crossbeam, and the vertical section of the L-shaped end of the longitudinal beam is provided with the positioning part.

3. The expandable subframe structure according to claim 1, characterized in that, The positioning part is a positioning boss, and a first opening is provided at the positioning part. Second openings are provided at both ends of the detachable crossbeam. Fasteners pass through the second openings and the first openings to fasten the detachable crossbeam to the subframe body.

4. The expandable subframe structure according to claim 1, characterized in that, The distance between the detachable crossbeam and the center of the subframe body is less than the distance between the crossbeam below it and the center of the subframe body. The suspension mounting part is located on a crossbeam of the subframe body, away from the detachable crossbeam.

5. The expandable subframe structure according to claim 1, characterized in that, The height of the middle part of the detachable crossbeam is greater than the height of its two sides. The detachable crossbeam is provided with at least one suspension bushing mounting hole. The suspension bushing is installed in the suspension bushing mounting hole. The suspension bracket is fastened to the suspension bushing. The detachable crossbeam is hollow inside, and reinforcing ribs are provided on the side of the suspension bushing mounting hole. The outer side of the detachable crossbeam is covered with a protective layer.

6. The expandable subframe structure according to claim 1, characterized in that, The side of the suspension bracket away from the detachable crossbeam is arc-shaped, and the arc-shaped side of the suspension bracket is provided with at least three third openings, with a distance between adjacent third openings.

7. The expandable subframe structure according to claim 1, characterized in that, The subframe body includes a first crossbeam, with its two ends connected to a first longitudinal beam and a second longitudinal beam, respectively. The ends of the first and second longitudinal beams away from the first crossbeam are connected to the second crossbeam. The first and second longitudinal beams are provided with positioning parts, and the second crossbeam is positioned below the positioning parts. The height of the middle part of the first and second longitudinal beams is greater than the height of their sides. A third crossbeam is also connected between the bottom sides of the first and second longitudinal beams.

8. The expandable subframe structure according to claim 7, characterized in that, The first crossbeam is provided with the suspension mounting part, which includes a first mounting bracket and a second mounting bracket arranged opposite to each other. The first mounting bracket has a through hole and the second mounting bracket has a threaded hole.

9. A vehicle, characterized in that, The expandable subframe structure according to any one of claims 1-8 is adopted.

10. A method for installing an expandable subframe structure as described in any one of claims 1-8, characterized in that, Includes the following: Positioning parts are set at the longitudinal beams during the manufacturing process of the subframe body; The detachable crossbeam is installed through the positioning part at the longitudinal beam, and after installation, the detachable crossbeam is located above the crossbeam on the same side. The motor is mounted by means of a detachable crossbeam mounting section and a mounting bracket.

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