Electric heavy truck and frame assembly thereof

Abstract

The invention discloses an electric heavy truck and a frame assembly thereof, and belongs to the technical field of vehicle bearing systems. The frame assembly comprises two longitudinal beams arranged oppositely and a plurality of cross beams connected between the two longitudinal beams in a crossing mode. Wherein the longitudinal beams are integral beams, and the cross beams are arranged at intervals in the extending direction of the two longitudinal beams; the battery frame is connected with at least two cross beams arranged at intervals through connecting pieces, the battery frame is of a frame structure defined by a first rod body extending in the X direction, a second rod body extending in the Y direction and a third rod body extending in the Z direction, the X direction is the front-back direction of the frame, the Y direction is the left-right direction of the frame, and the Z direction is the up-down direction of the frame; the at least two second rod bodies of the battery frame are located under the cross beams connected with the second rod bodies; a closed ring beam structure is defined by the cross beams, the connecting pieces and the battery frame. The design requirements for rigidity and light weight can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of electric heavy trucks, and in particular to an electric heavy truck and a frame assembly thereof. Background Art

[0002] For new energy electric heavy trucks, the load-bearing system is particularly important. To ensure that the vehicle has sufficient mileage, strong load-bearing capacity and high lightness are the ultimate goals pursued by the current market.

[0003] At present, it is difficult for the load-bearing system of electric heavy trucks to meet both the requirements of rigidity and lightness. Usually, in order to give priority to the rigidity requirements of the load-bearing frame, the weight of the longitudinal beams and cross beams of the frame is increased to improve, for example, torsional rigidity and bending rigidity, which will lead to problems such as a larger vehicle weight and reduced vehicle range. In addition, since electric heavy trucks need to be equipped with a radiator with sufficient heat dissipation power, sufficient radiator layout space needs to be set at the front end of the frame, and the steering gear support must be compatible with the installation. Traditional straight beam frames and ladder frames are difficult to meet the above two requirements at the same time. Summary of the invention

[0004] The technical problem to be solved by the present invention is that it is difficult for existing heavy trucks to meet both the requirements of rigidity and lightness.

[0005] In view of the above technical problems, the present invention provides the following technical solutions: A frame assembly of an electric heavy truck comprises: two longitudinal beams arranged opposite to each other and a plurality of cross beams connected across the two longitudinal beams; wherein the longitudinal beams are integral beams, and a plurality of the cross beams are arranged at intervals along the extension direction of the two longitudinal beams; a battery frame, wherein the battery frame is connected to at least two cross beams arranged at intervals through a connecting piece, and the battery frame is surrounded by a first rod body extending along an X direction, a second rod body extending along a Y direction, and a third rod body extending along a Z direction to form a frame structure, wherein the X direction is the front-rear direction of the frame, the Y direction is the left-right direction of the frame, and the Z direction is the up-down direction of the frame; at least two of the second rod bodies of the battery frame are located directly below the cross beams connected thereto; and the cross beams, the connecting piece, and the battery frame form a closed ring beam structure.

[0006] In some embodiments of the present invention, the connecting member includes at least one first connecting portion extending along the Y direction and at least one second connecting portion extending along the Z direction, the crossbeam is connected to the first connecting portion of the connecting member, and the battery frame is connected to the second connecting portion of the connecting member.

[0007] In some embodiments of the present invention, the battery frame is entirely located at the lower side of the longitudinal beam, and the longitudinal beam divides the battery frame into a first area located between two longitudinal beams and a second area and a third area located on the left and right sides of the longitudinal beam respectively.

[0008] In some embodiments of the present invention, the second rod body located on the upper side of the second area and the third area of ​​the battery frame is connected to the second connecting portion of the connecting member through a fastening assembly.

[0009] In some embodiments of the present invention, the connector further includes at least one third connecting portion extending along the X direction, and at least one of the second rods in the first area of ​​the battery frame is connected to the third connecting portion of the connector via a fastening assembly.

[0010] In some embodiments of the present invention, the crossbeam includes a crossbeam body extending along the Y direction and support frames respectively connected to the left and right sides of the crossbeam body, the support frames are fixedly connected to the longitudinal beam, and the battery frame is connected to the support frame through the connecting member in an area opposite to the longitudinal cross-section of the crossbeam body.

[0011] In some embodiments of the present invention, the frame assembly forms a front area, a battery bearing area and a main bearing area from front to rear along the X-direction, the front area includes a first cross beam and a second cross beam, the battery bearing area includes a third cross beam, a fourth cross beam and a fifth cross beam, the battery frame is connected to the third cross beam and the fifth cross beam, and the main bearing area includes a sixth cross beam and a seventh cross beam.

[0012] In some embodiments of the present invention, the longitudinal beam is formed in the front region as an expanded beam body that gradually expands toward the front side, and the longitudinal beams in the front region and the battery supporting region are transitioned through a bending transition region.

[0013] In some embodiments of the present invention, a saddle support plate is further included which is connected to the outer area of ​​the longitudinal beam, and the support frame of the fifth cross beam extends to a partial area and overlaps with the saddle support plate along the X direction.

[0014] The present invention also provides an electric heavy truck, comprising the above-mentioned frame assembly.

[0015] The technical solution of the present invention has the following technical effects compared with the prior art: In the frame assembly of the electric heavy truck provided by the present invention, the longitudinal beam extending along the front-rear direction of the frame is an integral beam, which can ensure the overall rigidity of the frame. The battery frame is connected to at least two spaced-apart cross beams through a connecting piece, and the cross beam, the connecting piece and the battery frame are connected end to end to form a ring beam structure, which further improves the torsional rigidity and bending rigidity of the frame. The frame assembly can take into account the design requirements of rigidity and lightweight. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which will help to understand the objects and advantages of the present invention, wherein: Figure 1 A three-dimensional diagram of a specific embodiment of the frame assembly of the electric heavy truck of the present invention; Figure 2 A front view of a specific embodiment of the frame assembly of the electric heavy truck of the present invention; Figure 3 for Figure 2 Cross-sectional view of the AA section; Figure 4 A schematic diagram of a specific implementation of a connecting member in a vehicle frame assembly of the present invention; Figure 5 It is a partial schematic diagram of the frame assembly of the electric heavy truck of the present invention; Figure 6 Another partial schematic diagram of the frame assembly of the electric heavy truck of the present invention; Figure 7 A schematic diagram of a vehicle frame assembly without a battery frame according to the present invention; Figure 8 It is a top view of a specific implementation of the longitudinal beam in the frame assembly of the present invention. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] like Figure 1-3 The figure shows a specific embodiment of the frame assembly 100 of the electric heavy truck provided by the present invention, which includes two longitudinal beams 10 arranged opposite to each other and a plurality of cross beams 20 spanning and connecting between the two longitudinal beams 10; wherein the longitudinal beam 10 is an integral beam, and a plurality of the cross beams 20 are arranged at intervals along the extension direction of the two longitudinal beams 10; and further includes a battery frame 30 connected to at least two cross beams 20 arranged at intervals through a connecting member 40, wherein the battery frame 30 is surrounded by a first rod body 31 extending along the X direction, a second rod body 32 extending along the Y direction, and a third rod body 33 extending along the Z direction to form a frame structure, wherein the X direction is the front-to-back direction of the frame, the Y direction is the left-to-right direction of the frame, and the Z direction is the up-and-down direction of the frame Specifically, the first rod body 31, the second rod body 32 and the third rod body 33 can be formed as an integral rod body, or a split rod body connected by a connecting assembly. In addition, in addition to the rod body constituting the outer contour of the battery frame 30, in order to improve the strength of the battery frame 30, one or more groups of first rod bodies 31 extending along the X direction, second rod bodies 32 extending along the Y direction and third rod bodies 33 extending along the Z direction can be arranged inside the battery frame 30 to achieve enhanced support. At least two of the second rod bodies 32 of the battery frame 30 are located directly below the crossbeam 20 connected thereto; the crossbeam 20, the connecting member 40 and the battery frame 30 form a closed ring beam structure ( Figure 3 The ring beam structure described in the present invention refers to a beam structure that is connected end to end to form a ring.

[0022] In the above-mentioned frame, the longitudinal beam 10 is an integral beam, that is, a beam body that is formed in one piece and does not require other connecting parts to be connected, which can ensure the overall rigidity of the frame. The battery frame 30 is connected to at least two spaced-apart cross beams 20 through a connecting member 40, and the cross beam 20, the connecting member 40 and the battery frame 30 are connected end to end to form a ring beam structure, which further improves the torsional rigidity and bending rigidity of the frame. Therefore, the frame can take into account the design requirements of rigidity and lightweight.

[0023] Specifically, in an optional embodiment, the battery frame 30 is connected to two spaced cross beams 20 and the longitudinal beam 10 through four connecting members 40 located outside the longitudinal beam 10, wherein, Figure 4 As shown, the connecting member 40 is constructed as an integral casting, including at least one first connecting portion 41 extending along the Y direction and at least one second connecting portion 42 extending along the Z direction. Figure 1As shown, the crossbeam 20 is connected to the first connection portion 41 of the connector 40, and the battery frame 30 is connected to the second connection portion 42 of the connector 40. More specifically, the first connection portion 41 and the second connection portion 42 are formed as connection holes, and the crossbeam 20 and the battery frame 30 are connected to the connector 40 via threaded fastening components passing through the connection holes.

[0024] Specifically, in an optional embodiment, the battery frame 30 is entirely located at the lower side of the longitudinal beam 10, and the longitudinal beam 10 divides the battery frame 30 into a first area 30a located between the two longitudinal beams 10 and a second area 30b and a third area 30c located on the left and right sides of the longitudinal beam 10, respectively. The battery frame 30 is divided into three areas to accommodate three groups of battery packs. The first rod body 31 of the battery frame 30 extending along the X direction is constructed as an integral rod body to ensure the torsional stiffness and bending stiffness of the battery frame 30, such as Figure 1 As shown, four first rods 31 are arranged at intervals along the Y direction to form three areas for accommodating the battery pack. The second rod 32 of the battery frame 30 extending along the Y direction is constructed as a multi-section split rod, and the two ends of the second rod 32 are respectively connected to the two first rods 31 arranged at intervals through fastening components.

[0025] The second rod body 32 of the second area 30b and the third area 30c of the battery frame 30 is located on the upper side and is connected to the second connecting portion 42 of the connecting member 40 through a fastening assembly. More specifically, as Figure 4 As shown, a limiting hole 44 is also provided on the connecting member 40, and a limiting pin is provided on the second rod body 32 on the upper side of the second area 30b and the third area 30c of the battery frame 30. During installation, the connecting member 40 is first sleeved on the limiting pin, and then the connecting member 40 is connected to the second rod body 32 of the battery frame 30 through a fastening assembly.

[0026] Specifically, in an optional implementation manner, Figure 4 As shown, the connector 40 also includes at least one third connecting portion 43 extending along the X direction, and at least one second rod 32 of the first area 30a of the battery frame 30 is connected to the third connecting portion 43 of the connector 40 through a fastening assembly. Specifically, the third connecting portion 43 is a connecting hole formed on the connector 40 and extending along the X direction, and the second rod 32 is connected to the connector 40 through a threaded fastening assembly penetrated through the connecting hole. In this way, the battery frame 30 and the connector 40 are connected in both the X direction and the Z direction, further improving the connection strength between the battery frame 30 and the connector 40, thereby improving the torsional stiffness and bending stiffness of the entire frame.

[0027] Specifically, in an optional implementation manner, Figure 5 , Figure 6 As shown, the crossbeam 20 includes a crossbeam body 21 extending along the Y direction and support frames 22 respectively connected to the left and right sides of the crossbeam body 21, the support frame 22 is fixedly connected to the longitudinal beam 10, and the battery frame 30 is connected to the support frame 22 through the connecting member 40 on the area opposite to the longitudinal section of the crossbeam body 21.

[0028] Specifically, the beam body 21 is constructed as an integrally formed I-beam or frame beam body, and a plurality of connection holes are respectively provided on the upper surface and the lower surface of the beam body 21, and the support frame 22 is connected to the beam body 21 via a fastening assembly passing through the connection holes.

[0029] Specifically, the structural form of the support frame 22 is not unique. In a specific implementation, Figure 5 As shown, the support frame 22 is constructed in the form of an integral frame, which includes two first plates 221 extending in the horizontal direction and spaced apart, and a second plate 222 extending in the vertical direction and connected between the two first plates 221, wherein the length of the second plate 222 in the X direction is greater than the length of the crossbeam body 21 in the X direction, and the second plate 222 is provided with a first reinforcing plate 223 in the area opposite to the crossbeam body 21, and the battery frame 30 is connected to the area where the first reinforcing plate 223 is located through the connecting member 40. The reinforcing plate can improve the connection strength and avoid stress concentration.

[0030] In another specific embodiment, Figure 6 As shown, the support frame 22 is constructed as a split frame structure, which includes a first frame 224 located on the upper side and a second frame 225 located on the lower side, the first frame 224 and the second frame 225 are respectively formed as L-shaped plates, the plates of the first frame 224 and the second frame 225 extending in the vertical direction are connected to the inner wall of the longitudinal beam 10 through a fastening assembly, and the plates of the first frame 224 and the second frame 225 extending in the horizontal direction are connected to the cross beam body 21 through a fastening assembly; a partial area of ​​the plate of the second frame 225 extending in the vertical direction extends upward to form a second reinforcing plate 226, and the battery frame 30 is connected to the second reinforcing plate 226 through the connecting member 40.

[0031] Specifically, in a specific implementation manner, Figure 7As shown, the frame assembly 100 forms a front area 100a, a battery carrying area 100b and a main carrying area 100c from front to back along the X direction, wherein the front area 100a of the frame assembly 100 is used to carry the front of the vehicle, the battery carrying area 100b of the frame assembly 100 is used to carry and accommodate the battery pack, and the main carrying area 100c of the frame assembly 100 is used to carry the cargo box. Among them, the front area 100a includes a first crossbeam 20a and a second crossbeam 20b, wherein the first crossbeam 20a is connected to the front end of the two longitudinal beams 10, the battery bearing area 100b includes a third crossbeam 20c, a fourth crossbeam 20d and a fifth crossbeam 20e, the battery frame 30 is connected to the third crossbeam 20c and the fifth crossbeam 20e, the main bearing area 100c includes a sixth crossbeam 20f and a seventh crossbeam 20g, wherein the sixth crossbeam 20f is a cast tube beam, and the seventh crossbeam 20g is connected to the rear end of the two longitudinal beams 10.

[0032] Specifically, the cross beam bodies 21 of the fourth cross beam 20d and the fifth cross beam 20e are relatively close, and the two cross beam bodies 21 are connected to the longitudinal beam 10 through a support frame 22 of a split frame structure. The saddle support plate 50 is arranged in the area where the sixth cross beam 20f is located in the outer area of ​​the longitudinal beam 10, and the support frame 22 of the fifth cross beam 20e extends to a part of the area and overlaps with the saddle support plate 50 along the X direction (refer to Figure 6 , Figure 7 The circled part), that is, the rear area of ​​the support frame 22 of the fifth cross beam 20e and the front area of ​​the saddle support plate 50 are arranged opposite to each other on the inner and outer sides of the longitudinal beam 10 respectively to avoid the problem of stress concentration in this area.

[0033] Specifically, in an optional embodiment, the longitudinal beam 10 is formed into an expanded beam body that gradually expands toward the front side in the front area 100a, and the longitudinal beams 10 in the front area 100a and the battery carrying area 100b transition through a bending transition area 10a, so that the two longitudinal beams 10 form a trumpet shape in the front area. Compared with the existing trapezoidal transition area formed by two bends, the longitudinal beam 10 structure is compatible with the installation of different forms of steering gear brackets. Specifically, as Figure 8 As shown, the angle α of the front area of ​​the longitudinal beam 10 relative to the X direction is 2°-5°. The longitudinal beam 10 adopts a high belly and low thickness beam body form, and its cross-sectional inertia moment is relatively high, which further improves the torsional rigidity of the frame.

[0034] The present invention also provides a specific implementation of an electric heavy truck, which includes the above-mentioned frame assembly 100. The frame assembly 100 adopts the structure as described above. The use of the above-mentioned frame assembly 100 can greatly improve the rigidity of the frame and easily meet the lightweight design requirements.

[0035] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A frame assembly of an electric heavy truck, characterized in that: include: Two longitudinal beams arranged opposite to each other and a plurality of transverse beams spanning and connecting between the two longitudinal beams; wherein the longitudinal beams are integral beams, and the plurality of transverse beams are arranged at intervals along the extending direction of the two longitudinal beams; A battery frame, wherein the battery frame is connected to at least two spaced-apart cross beams through a connecting piece, and the battery frame is formed by a first rod extending along an X direction, a second rod extending along a Y direction, and a third rod extending along a Z direction to form a frame structure, wherein the X direction is the front-to-back direction of the frame, the Y direction is the left-to-right direction of the frame, and the Z direction is the up-and-down direction of the frame; at least two of the second rods of the battery frame are located directly below the cross beam connected thereto; the cross beam, the connecting piece, and the battery frame form a closed ring beam structure.

2. The frame assembly of an electric heavy truck according to claim 1, characterized in that: The connecting member includes at least one first connecting portion extending along the Y direction and at least one second connecting portion extending along the Z direction, the crossbeam is connected to the first connecting portion of the connecting member, and the battery frame is connected to the second connecting portion of the connecting member.

3. The frame assembly of an electric heavy truck according to claim 2, characterized in that: The battery frame is entirely located at the lower side of the longitudinal beam, and the longitudinal beam divides the battery frame into a first area located between the two longitudinal beams and a second area and a third area located at the left and right sides of the longitudinal beam respectively.

4. The frame assembly of an electric heavy truck according to claim 3, characterized in that: The second area and the third area of ​​the battery frame are located on the upper side of the second rod body connected to the second connecting portion of the connecting member through a fastening assembly.

5. The frame assembly of an electric heavy truck according to claim 4, characterized in that: The connecting member further includes at least one third connecting portion extending along the X direction, and at least one of the second rods in the first area of ​​the battery frame is connected to the third connecting portion of the connecting member through a fastening assembly.

6. The frame assembly of an electric heavy truck according to claim 1, characterized in that: The crossbeam includes a crossbeam body extending along the Y direction and support frames respectively connected to the left and right sides of the crossbeam body, the support frames are fixedly connected to the longitudinal beam, and the battery frame is connected to the area of ​​the support frame opposite to the longitudinal section of the crossbeam body through the connecting piece.

7. The frame assembly of an electric heavy truck according to claim 1, characterized in that: The frame assembly forms a front area, a battery bearing area and a main bearing area from front to rear along the X direction, respectively. The front area includes a first cross beam and a second cross beam, the battery bearing area includes a third cross beam, a fourth cross beam and a fifth cross beam, the battery frame is connected to the third cross beam and the fifth cross beam, and the main bearing area includes a sixth cross beam and a seventh cross beam.

8. The frame assembly of an electric heavy truck according to claim 7, characterized in that: The longitudinal beam is formed as an expanded beam body gradually expanding toward the front side in the front area, and the longitudinal beams in the front area and the battery supporting area are transitioned through a bending transition area.

9. The frame assembly of an electric heavy truck according to claim 7, characterized in that: It also includes a saddle support plate connected to the outer area of ​​the longitudinal beam, and the support frame of the fifth cross beam extends to a partial area and overlaps with the saddle support plate along the X direction.

10. An electric heavy truck, characterized in that: The vehicle frame assembly comprises any one of claims 1-9.

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