Auxiliary frame and vehicle

Abstract

The utility model discloses an auxiliary frame and a vehicle, the auxiliary frame comprises two longitudinal beams, a first cross beam and a second cross beam which are connected to form a frame structure, a third cross beam is connected between the two longitudinal beams, and an adjusting rod used for adjusting the modality of the auxiliary frame is connected between the first cross beam and the third cross beam. In the embodiment of the utility model, the first cross beam is connected with the third cross beam through the adjusting rod, the first-order bending mode can be improved, and the adjusting rod is small in size and light in weight, so that the weight of the whole auxiliary frame can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a subframe and a vehicle. Background Art

[0002] The subframe usually serves as an intermediate buffer for connecting the suspension and the vehicle body. The subframe is divided into a front subframe and a rear subframe, which are respectively located at the front and rear ends of the vehicle.

[0003] The existing rear subframe is usually a five-link rear subframe. The cross beam and longitudinal beam in the rear subframe are usually formed by stamping and welding, hydroforming and other methods. The modal of the existing rear subframe is relatively low. In order to improve the modal of the rear subframe, usually the method of additionally adding longitudinal beams with heavier weight or increasing the thickness of the longitudinal beams is adopted. However, this will result in a heavier weight of the rear subframe. Summary of the Utility Model

[0004] The utility model provides a subframe and a vehicle, aiming to at least solve the technical problem of how to improve the modal of the subframe and reduce the weight of the subframe in the prior art.

[0005] In a first aspect, an embodiment of the utility model provides a subframe, which includes two longitudinal beams, a first cross beam and a second cross beam connected to form a frame structure. A third cross beam is connected between the two longitudinal beams, and an adjusting rod for adjusting the modal of the subframe is connected between the first cross beam and the third cross beam;

[0006] Optionally, the number of the adjusting rods is two, and the two adjusting rods are arranged crosswise, or the two adjusting rods are arranged at intervals along the extending direction of the third cross beam.

[0007] Optionally, one end of the adjusting rod is detachably connected to the first cross beam, and the other end of the adjusting rod is detachably connected to the third cross beam.

[0008] Optionally, the longitudinal beam is formed by rolling and welding a first sheet material; the first cross beam is formed by rolling and welding a second sheet material.

[0009] Optionally, from the middle of the longitudinal beam to both ends of the longitudinal beam, the cross-sectional area of the longitudinal beam gradually increases, and the cross-sectional area of the adjusting rod is smaller than the minimum cross-sectional area of the longitudinal beam.

[0010] Optionally, from the middle of the first cross beam to both ends of the first cross beam, the cross-sectional area of the first cross beam gradually decreases.

[0011] Optionally, the second cross beam is formed by welding a first stamping part and a second stamping part, and the cross-sectional shapes of the first stamping part and the second stamping part are both L-shaped.

[0012] Optionally, the second cross beam is connected to the third cross beam through a connecting member.

[0013] Optionally, one end of the adjusting rod is connected to the first cross beam through a fastener, and the other end of the adjusting rod is connected to the third cross beam through a fastener.

[0014] In a second aspect, an embodiment of the present invention provides a vehicle, including the subframe as described above.

[0015] In the embodiment of the present invention, the first cross beam is connected to the third cross beam through the adjusting rod, which can improve the first-order bending mode, and the adjusting rod has a small size, low cost and light weight, so as to reduce the weight of the entire subframe.

[0016] The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are given below. Description of the Drawings

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the subframe provided by the embodiment of the present invention;

[0018] Figure 2 It is a front view structural schematic diagram of the subframe provided by the embodiment of the present invention;

[0019] Figure 3 It is a top view structural schematic diagram of the subframe provided by the embodiment of the present invention;

[0020] Figure 4 It is a sectional view structural schematic diagram of the second cross beam in the subframe provided by the embodiment of the present invention.

[0021] Reference Numerals:

[0022] 1 - First cross beam, 2 - Second cross beam, 21 - First stamping part, 22 - Second stamping part, 3 - Third cross beam, 31 - Third cross beam main body, 32 - Connection section, 4 - Longitudinal beam, 5 - Adjusting rod, 6 - Connecting member. Detailed Embodiments

[0023] Hereinafter, the exemplary embodiments of the present invention will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be completely conveyed to those skilled in the art.

[0024] The existing rear subframe is usually a five-link rear subframe. The crossbeam and longitudinal beam in the rear subframe are usually formed by stamping and welding, hydroforming and other methods. The modal of the existing rear subframe is relatively low. In order to improve the modal of the rear subframe, usually the method of adding longitudinal beams with heavier weight or increasing the thickness of the longitudinal beams is adopted. However, this will lead to a heavier weight of the rear subframe. To solve the above problems, the embodiments of the present invention provide a subframe and a vehicle, and the above-mentioned subframe and vehicle will be specifically described below.

[0025] In the first aspect, referring to Figures 1 to 3 , the embodiments of the present invention disclose a subframe, which includes two longitudinal beams 4, a first crossbeam 1 and a second crossbeam 2 connected into a frame structure. A third crossbeam 3 is connected between the two longitudinal beams 4, and an adjusting rod 5 for adjusting the modal of the subframe is connected between the first crossbeam 1 and the third crossbeam 3.

[0026] This subframe is applied to vehicles of various models, such as sedans, commercial vehicles, off-road vehicles, sports utility vehicles, etc. It should be noted that in the description of this embodiment, the up and down directions, front and back directions, and left and right directions are consistent with the up and down directions, front and back directions, and left and right directions of the vehicle. The following takes the subframe as the rear subframe, the first crossbeam 1 as the front crossbeam, the second crossbeam 2 as the rear crossbeam, and the third crossbeam 3 as the lower crossbeam to illustrate the content of the present invention.

[0027] The first crossbeam 1 and the second crossbeam 2 are respectively connected to both ends of the two longitudinal beams 4. The third crossbeam 3 is located below the longitudinal beams 4, and the adjusting rod 5 is located below the two longitudinal beams 4. One end of the longitudinal beam 4 is connected to the first crossbeam 1, and the other end of the longitudinal beam 4 is connected to the second crossbeam 2. The connection method between the longitudinal beam 4 and the first crossbeam 1 can be welding, and the connection method between the longitudinal beam 4 and the second crossbeam 2 can be welding. The number of longitudinal beams 4 is two, and the first crossbeam 1, the second crossbeam 2 and the two longitudinal beams 4 are connected to form a frame structure. The two longitudinal beams 4 are arranged oppositely along the width direction of the subframe and arch upward, and the width direction of the subframe is parallel to the width direction of the vehicle. The third crossbeam 3 can be connected to the lower sides of the two longitudinal beams 4. The third crossbeam 3 can be formed by welding a plurality of stamping parts. The third crossbeam 3 is used for the installation of the spring arm. A first bushing assembly for installing a suspension bracket is provided on the second crossbeam 2. A second bushing assembly for installing a suspension bracket can be provided on the third crossbeam 3.

[0028] The cross-section of the adjusting rod 5 is the section perpendicular to the length direction of the adjusting rod 5. The shape of the cross-section of the adjusting rod 5 can be circular, square, etc. The adjusting rod 5 can be a variable cross-section rod or an equal cross-section rod. The adjusting rod 5 is preferably an equal cross-section rod with a circular cross-section shape. The connection mode between the adjusting rod 5 and the first cross beam 1 can be welding, detachable connection, etc., and the connection mode between the adjusting rod 5 and the third cross beam 3 can be welding, detachable connection, etc. When the cross-section shape of the adjusting rod 5 is circular, both ends of the adjusting rod 5 need to go through a flattening process to facilitate the connection between both ends of the adjusting rod 5 and the first cross beam 1 and the third cross beam 3.

[0029] In the existing subframe, there is no connection between the front cross beam and the lower cross beam, which will result in a relatively low first-order bending mode. Or, the front cross beam and the lower cross beam are connected by a relatively heavy lower longitudinal beam, which is heavy in weight, complex in structure, and high in cost. In the embodiment of the present invention, the first cross beam 1 is connected to the third cross beam 3 through the adjusting rod 5, which can improve the first-order bending mode, and the size of the adjusting rod 5 is small, the cost is low, and the weight is light, so that the weight of the entire subframe can be reduced. It should be noted that the above-mentioned first-order bending mode specifically refers to the first-order Y-direction bending mode, and the Y-direction refers to the width direction of the whole vehicle.

[0030] In a preferred embodiment of the present invention, the number of the adjusting rods 5 is two, and the two adjusting rods 5 are arranged crosswise, or the two adjusting rods 5 are arranged at intervals along the extension direction of the third cross beam 3.

[0031] Wherein, the third cross beam 3 includes a third cross beam main body 31 and two connecting sections 32 connected to both ends of the third cross beam main body 31. The connecting sections 32 are arranged at an angle with the third cross beam main body 31, the connecting sections 32 are connected to the longitudinal beam 4, and the two adjusting rods 5 are respectively connected to both ends of the third cross beam main body 31. The extension direction of the third cross beam 3 is parallel to the width direction of the subframe, and the width direction of the subframe can be referred to Figure 1 the direction shown by the A arrow in []. Referring to Table 1, through comparative analysis, it can be known that when the two adjusting rods 5 are arranged at intervals along the extension direction of the third cross beam 3, the first-order bending mode can be significantly improved. When the two adjusting rods 5 are arranged crosswise, the first-order bending mode and the first-order torsional mode can be significantly improved. It should be noted that the first-order bending mode and the first-order torsional mode can be adjusted by adjusting the wall thickness of the adjusting rod 5 and the size of the cross-section of the adjusting rod 5.

[0032] Table 1

[0033]

[0034] In a preferred embodiment of the present invention, the second cross beam 2 is connected to the third cross beam 3 through a connecting piece 6.

[0035] Among them, both ends of the third cross beam 3 are respectively connected to two longitudinal beams 4, and the connection manner between the third cross beam 3 and the longitudinal beam 4 can be welding, bolt connection, etc. The main body 31 of the third cross beam is connected to the longitudinal beam 4 through a connection section 32. The second cross beam 2 is specifically connected to the main body 31 of the third cross beam 3 in the third cross beam 3 through a connecting member 6. The connection manner between the connecting member 6 and the second cross beam 2 can be welding, bolt connection, etc., and the connection manner between the connecting member 6 and the third cross beam 3 can be welding, bolt connection, etc. In this embodiment, the end of the third cross beam 3 is connected to the longitudinal beam 4, and the main body 31 of the third cross beam is connected to the second cross beam 2 through the connecting member 6, which can improve the installation stability of the third cross beam 3, and further improve the stiffness of the spring arm mounting point.

[0036] In a preferred embodiment of the present utility model, one end of the adjusting rod 5 is detachably connected to the first cross beam 1, and the other end of the adjusting rod 5 is detachably connected to the third cross beam 3. Among them, the connection manner between one end of the adjusting rod 5 and the first cross beam 1 can be bolt connection, clamping by a clamping member, etc., and the connection manner between the other end of the adjusting rod 5 and the second cross beam 2 can be bolt connection, clamping by a clamping member, etc. In this embodiment, the adjusting rod 5 is detachably connected to the first cross beam 1 and the third cross beam 3. Therefore, according to actual needs, the adjusting rod 5 can be removed or the arrangement manner of the two adjusting rods 5 can be adjusted to adjust the first-order bending mode.

[0037] In a preferred embodiment of the present utility model, the longitudinal beam 4 is formed by rolling and welding a first sheet material, and the first cross beam 1 is formed by rolling and welding a second sheet material.

[0038] The material of the first sheet material is metal, such as steel. The material of the first sheet material can specifically be high-strength steel such as QSTE550, FB590, FB780, CP800, etc. After the first sheet material is rolled and welded to form the longitudinal beam 4, the longitudinal beam 4 has only one weld seam, and this weld seam can be located at the lower part of the longitudinal beam 4, or at the side of the longitudinal beam 4, or at the upper part of the longitudinal beam 4.

[0039] When the existing longitudinal beam is formed by a hydroforming method, it is usually to hydroform an equal-diameter round tube, and the cross-section change rate is usually less than 10%, and it is difficult to achieve a large cross-section change. In this embodiment, the longitudinal beam 4 is formed by rolling and welding a first sheet material, that is, the longitudinal beam 4 is formed by curling and welding the sheet material. The cross-section change rate of the longitudinal beam 4 is not limited, and the design flexibility is relatively high. The size of the cross-section of the longitudinal beam 4 can be set according to actual needs. For example, a larger cross-section size can be used at the position where high strength is required, and a smaller cross-section size can be used at the position where the strength requirement is low.

[0040] When the existing longitudinal beam is formed by stamping and welding, the longitudinal beam is usually formed by welding two stamping plates. A single longitudinal beam has two weld seams, with a complex structure and a relatively heavy weight. In this embodiment, the longitudinal beam 4 is formed by curling and welding a sheet material. The longitudinal beam 4 has only one weld seam. Compared with the double weld seams of the existing longitudinal beam, the total length of the weld seam is shortened, which can reduce the manufacturing cost; and compared with the longitudinal beam formed by welding two stamping plates, the longitudinal beam 4 formed by curling and welding a sheet material is lighter in weight.

[0041] The material of the second sheet material is metal, such as steel. Specifically, the material of the second sheet material can be high-strength steel such as QSTE550, FB590, FB780, CP800, etc. The materials of the second cross beam 2, the third cross beam 3, and the adjusting rod 5 can all be steel, such as high-strength steel such as QSTE550, FB590, FB780, CP800, etc. After the second sheet material is rolled and welded to form the first cross beam 1, the first cross beam 1 has only one weld seam, and this weld seam can be located at the lower part of the first cross beam 1, or on the side of the first cross beam 1, or at the upper part of the first cross beam 1.

[0042] In a preferred embodiment of the present utility model, from the middle of the longitudinal beam 4 to both ends of the longitudinal beam 4, the cross-sectional area of the longitudinal beam 4 gradually increases, and the cross-sectional area of the adjusting rod 5 is smaller than the minimum cross-sectional area of the longitudinal beam 4.

[0043] Among them, the cross-sectional area of the adjusting rod 5 is preferably less than one-half of the minimum cross-sectional area of the longitudinal beam 4. Control arm mounting brackets and swing arm mounting brackets are provided on the longitudinal beam 4, and the swing arm mounting brackets are located at both ends of the longitudinal beam 4. The cross-section of the longitudinal beam 4 is the section perpendicular to the extending direction of the longitudinal beam 4, and the extending direction of the longitudinal beam 4 can be consistent with the length direction of the vehicle. The cross-sectional shape of the longitudinal beam 4 can be square. The specific dimensions of the cross-section of the longitudinal beam 4 can be adjusted according to the results of strength and fatigue analysis. The cross-sectional dimensions of the middle part of the longitudinal beam 4 are small, and the cross-sectional dimensions of both ends of the longitudinal beam 4 are large, which can improve the stiffness at the connection between the longitudinal beam 4 and the first cross beam 1 and the second cross beam 2, can improve the stiffness of the longitudinal arm mounting point, and can improve the Y-direction stiffness of the control arm mounting point. The longitudinal beam 4 is a variable cross-section beam, which can optimize the mode of the subframe, and there is no need to increase the thickness of the longitudinal beam to improve the mode of the subframe, which can reduce the weight of the subframe.

[0044] In this embodiment, the first crossbeam 1 is formed by rolling and welding a second sheet material, that is, the first crossbeam 1 is formed by curling and welding the sheet material. The cross-sectional change rate of the first crossbeam 1 is not limited, and the design flexibility is relatively high. The size of the cross-section of the first crossbeam 1 can be set according to actual needs. For example, a larger cross-section size can be used at positions where high strength is required, and a smaller cross-section size can be used at positions where the strength requirement is low. In addition, since the first crossbeam 1 is formed by curling and welding the sheet material, the first crossbeam 1 has only one weld seam. Compared with the double weld seams of the existing crossbeams, the total length of the weld seam is shortened, and the manufacturing cost can be reduced; and compared with the crossbeam formed by welding two stamping plates, the first crossbeam 1 formed by curling and welding the sheet material is lighter in weight.

[0045] Both the first crossbeam 1 and the longitudinal beam 4 are hollow inside. Molds are required when the first crossbeam 1 and the longitudinal beam 4 are formed by curling and welding the sheet material. Due to the hollow design of the first crossbeam 1 and the longitudinal beam 4, there can be a certain amount of redundancy in the molds used for curling and welding the sheet material to be compatible with different vehicle models. For example, the redundancy can be 0.2 mm. Then, for a mold opening thickness of 2.2 mm, the lower limit can be 2 mm thick.

[0046] One first crossbeam 1 and two longitudinal beams 4 are all formed by curling and welding the sheet material, and each has one weld seam. Compared with the beam formed by welding two stamping plates, the total weld seam of the three beams can be reduced by about three meters, and the manufacturing cost can be reduced. One first crossbeam 1 and two longitudinal beams 4 are all formed by curling and welding the sheet material, and one first crossbeam 1 and two longitudinal beams 4 are all variable cross-section beams, which can significantly reduce the overall weight. Compared with the beam formed by welding two stamping plates with a constant cross-section, the total weight of the three beams can be reduced by about three kilograms.

[0047] In a preferred embodiment of the present utility model, from the middle of the first crossbeam 1 to both ends of the first crossbeam 1, the area of the cross-section of the first crossbeam 1 gradually decreases.

[0048] Wherein, the cross-section of the first crossbeam 1 is the section perpendicular to the extending direction of the first crossbeam 1. In the middle of the first crossbeam 1, the area of its cross-section is the largest, and at both ends of the first crossbeam 1, the area of its cross-section is the smallest. A suspension mounting structure is provided in the middle of the first crossbeam 1. Body mounting structures are provided at both ends of the first crossbeam 1 and the second crossbeam 2, and the body mounting structure can be a bushing assembly. The bushing assembly can include a bushing sleeve and a bushing. The bushing sleeve is used to install the bushing. The bushing sleeve is a cylindrical structure, and the axial direction of the bushing sleeve is parallel to the height direction of the subframe. In this embodiment, the cross-section size in the middle of the first crossbeam 1 is large, and the cross-section size at both ends of the first crossbeam 1 is small, which can meet the Z-direction stiffness of the suspension mounting point and can be adapted to the welding of the bushing sleeve at the same time.

[0049] In a preferred embodiment of the present utility model, referring toFigure 4 The second crossbeam 2 is formed by welding a first stamping part 21 and a second stamping part 22. The cross-sectional shapes of the first stamping part 21 and the second stamping part 22 are both L-shaped. Among them, the cross-sectional shape of the second crossbeam 2 is square. The cross-section of the first stamping part 21 is the section perpendicular to the length direction of the first stamping part 21, and the cross-section of the second stamping part 22 is the section perpendicular to the length direction of the second stamping part 22. Both the first stamping part 21 and the second stamping part 22 are formed by stamping, without the need for heat treatment, so that the sizes of the first stamping part 21 and the second stamping part 22 are relatively stable. In this embodiment, the second crossbeam 2 is formed by welding the L-shaped first stamping part 21 and the second stamping part 22, and the mold used is relatively simple and has strong design flexibility.

[0050] In a preferred embodiment of the present utility model, one end of the adjusting rod 5 is connected to the first crossbeam 1 through a fastener, and the other end of the adjusting rod 5 is connected to the third crossbeam 3 through a fastener. Among them, the fastener can be a bolt. The number of fasteners can be set according to actual needs, for example, set to at least two, so as to achieve a reliable connection between the adjusting rod 5 and the first crossbeam 1 and the third crossbeam 3. In this embodiment, the adjusting rod 5 is connected to the first crossbeam 1 and the third crossbeam 3 through fasteners. The connection method of the fasteners is easy to disassemble and assemble, and can ensure the reliability of the connection.

[0051] In a second aspect, an embodiment of the present utility model provides a vehicle, including the subframe provided in the first aspect above. Since the vehicle includes the above subframe, it also has the beneficial effects of the above subframe, which will not be elaborated here.

[0052] It should be noted that in this article, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the element.

[0053] The embodiments of the present utility model have been described above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present utility model, those of ordinary skill in the art can also make many forms without departing from the purpose and scope protected by the claims of the present utility model. All of these are within the protection scope of the present utility model.

Claims

1. A subframe, characterized in that, It includes two longitudinal beams, a first cross beam and a second cross beam which are connected to form a frame structure. A third cross beam is connected between the two longitudinal beams, and an adjusting rod for adjusting the mode of the subframe is connected between the first cross beam and the third cross beam.

2. The subframe according to claim 1, characterized in that, The number of the adjusting rods is two, and the two adjusting rods are arranged crosswise, or the two adjusting rods are arranged at intervals along the extending direction of the third cross beam.

3. The subframe according to claim 1, characterized in that, One end of the adjusting rod is detachably connected to the first cross beam, and the other end of the adjusting rod is detachably connected to the third cross beam.

4. The subframe according to any one of claims 1 to 3, characterized in that The longitudinal beam is formed by rolling and welding a first sheet material, and the first cross beam is formed by rolling and welding a second sheet material.

5. The subframe according to claim 1, wherein, From the middle of the longitudinal beam to both ends of the longitudinal beam, the area of the cross section of the longitudinal beam gradually increases, and the area of the cross section of the adjusting rod is smaller than the minimum area of the cross section of the longitudinal beam.

6. The subframe according to any one of claims 1 to 3, characterized in that, From the middle of the first cross beam to both ends of the first cross beam, the area of the cross section of the first cross beam gradually decreases.

7. The subframe according to any one of claims 1 to 3, characterized in that, The second cross beam is formed by welding a first stamping part and a second stamping part, and the cross sections of the first stamping part and the second stamping part are both L-shaped.

8. The subframe according to any one of claims 1 to 3, characterized in that, The second cross beam is connected to the third cross beam through a connecting piece.

9. The subframe according to claim 3, characterized in that, One end of the adjusting rod is connected to the first cross beam through a fastener, and the other end of the adjusting rod is connected to the third cross beam through a fastener.

10. A vehicle, characterized in that, It includes the subframe according to any one of claims 1 to 9.

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