electric commercial vehicle chassis structure

Abstract

An electric commercial vehicle chassis structure is provided, including a battery pack unit. The battery pack unit includes: a first bracket and a second bracket, disposed on the outer sides of two longitudinal beams, each including a pair of spaced-apart connecting plates at the top and a pair of spaced-apart support arms extending downwards beyond the bottom of the longitudinal beams; a pair of frames for accommodating the battery pack; a first mounting unit and a second mounting unit, disposed on a first side of each frame, each including: a vertical beam with a horizontally arranged central through-hole at its upper part, and a first rubber bushing fitted inside the central through-hole; a first support beam; and a first connecting beam for connecting the middle of the vertical beams of the first and second mounting units, with both ends connected to the two ends of the frame respectively; wherein the first rubber bushing is movable between the pair of connecting plates and its two ends are respectively connected to the pair of connecting plates. This battery pack unit has a larger mounting space and achieves weight reduction.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle components, and in particular to a chassis structure for an electric commercial vehicle. Background Technology

[0002] The domestic heavy-duty commercial vehicle market is gradually becoming electrified. For example, Chinese patent ZL202411889954.2 discloses a battery pack mounting structure for vehicles, including a first battery mounting unit. This first battery mounting unit includes: a first square frame, a second square frame, and a third square frame arranged sequentially at intervals along the longitudinal beam direction; a first longitudinal support rod and a second longitudinal support rod arranged in parallel; a third longitudinal support rod and a fourth longitudinal support rod arranged in parallel; a first guard plate bracket; a first upright, a second upright, a third upright, and a fourth upright; multiple rubber bushings or elastic connectors; multiple mounting brackets; a first connector disposed on the first square frame, the second square frame, and the third square frame; and a second connector disposed on the first square frame, the second square frame, and the third square frame. The first battery mounting unit and the battery pack can be pre-installed in the factory, and on-site, they only need to be connected to the mounting brackets on the longitudinal beam through rubber bushings or elastic connectors. The length is adjustable.

[0003] However, this structure is relatively heavy, and the space available for the battery pack needs further improvement. How to achieve lightweight chassis structure and / or how to increase the space available for the battery pack are urgent problems to be solved.

[0004] Therefore, it is necessary to study an electric commercial vehicle chassis structure to solve one or more of the aforementioned technical problems. Summary of the Invention

[0005] To solve at least one of the above-mentioned technical problems, according to one aspect of the present invention, an electric commercial vehicle chassis structure is provided, characterized in that it includes a battery pack unit, an air suspension system, and an electric drive axle arranged sequentially from front to rear, wherein the battery pack unit includes: The first and second supports are located on the outside of the two longitudinal beams and each includes a pair of spaced-apart connecting plates at the top and a pair of spaced-apart support arms extending downward and beyond the bottom of the longitudinal beams. A pair of frames to accommodate the battery pack; The first and second mounting units are disposed on the first side of each frame and each includes: a vertical beam with a horizontally arranged central through hole at its upper part and a first rubber bushing fitted inside the central through hole; and a first support beam connected to the bottom end of the vertical beam and used to support the bottom of the frame; and The first connecting beam is used to connect the middle of the vertical beams of the first and second hanging units and its two ends are respectively connected to the two ends of the frame; The upper and lower parts of the vertical beam are connected to the frame, and the first rubber bushing is movable between the pair of connecting plates and its two ends are respectively connected to the pair of connecting plates.

[0006] According to another aspect of the invention, the frame is formed by connecting four parallel L-shaped longitudinal beams, four vertical beams and four parallel transverse beams, defining a through space for accommodating the battery pack.

[0007] According to another aspect of the invention, the air suspension system includes a first suspension unit, the first suspension unit comprising: V-shaped push rods connect the tubular beam and the electric drive bridge; The upper ends of the first suspension bracket and the second suspension bracket are at least partially overlapped and connected to both ends of the tube beam and the outer sides of the two longitudinal beams, respectively. The first and second equalizing beams are connected in the middle to the electric drive axle, and the first and second airbags are respectively installed at both ends; and The U-shaped composite stabilizer bar has its two free ends connected to the middle of the first and second equalization beams, respectively. The U-shaped composite stabilizer bar is formed by connecting a first rod, a second rod, and a third rod in sequence to form a U-shape. The two ends of the second rod are connected to the bottom ends of the first suspension bracket and the second suspension bracket, respectively.

[0008] According to another aspect of the invention, the air suspension system includes a first suspension unit, the first suspension unit comprising: V-shaped push rods connect the tubular beam and the electric drive bridge; The upper ends of the first suspension bracket and the second suspension bracket are at least partially overlapped and connected to both ends of the tube beam and the outer sides of the two longitudinal beams, respectively. The first and second equalizing beams are connected in the middle to the electric drive axle, and the first and second airbags are respectively installed at both ends; and The first lower thrust rod and the second lower thrust rod are respectively connected between the bottom end of the first suspension bracket and the middle part of the first equalizer beam, and between the bottom end of the second suspension bracket and the middle part of the second equalizer beam. The first airbag and the second airbag are respectively connected to the two longitudinal beams via an upper bracket.

[0009] According to another aspect of the invention, the air suspension system includes a first suspension unit, the first suspension unit comprising: V-shaped push rods connect the tubular beam and the electric drive bridge; The upper ends of the first suspension bracket and the second suspension bracket are at least partially overlapped and connected to both ends of the tube beam and the outer sides of the two longitudinal beams, respectively. The U-shaped composite torsion tube has its two free ends connected to the bottom ends of the first suspension bracket and the second suspension bracket, respectively; and The first and second airbags are arranged vertically and connected between the U-shaped composite torsion tube and the two longitudinal beams, respectively.

[0010] According to another aspect of the invention, the air suspension system includes a first suspension unit, the first suspension unit comprising: X-shaped arm connects the tubular beam and the electric drive bridge; The upper ends of the first suspension bracket and the second suspension bracket are at least partially overlapped and connected to both ends of the tube beam and the outer sides of the two longitudinal beams, respectively. The first and second equalizing beams are connected in the middle to the electric drive axle, and the first and second airbags are respectively installed at both ends; and The first lower thrust rod and the second lower thrust rod are respectively connected between the bottom end of the first suspension bracket and the middle part of the first equalizer beam, and between the bottom end of the second suspension bracket and the middle part of the second equalizer beam. The first airbag and the second airbag are respectively connected to the two longitudinal beams via an upper bracket.

[0011] According to another aspect of the present invention, the first equalizing beam and the second equalizing beam are integrally cast with the housing of the electric drive bridge.

[0012] According to another aspect of the invention, the air suspension system includes two first suspension units arranged sequentially along a longitudinal beam; or, the air suspension system includes two mirror-arranged first suspension units sharing a common tube beam and a first suspension bracket and a second suspension bracket; or the air suspension system is replaced by a leaf spring suspension system.

[0013] According to another aspect of the present invention, the electric commercial vehicle chassis structure further includes: Another frame for accommodating a battery pack is positioned in front of the pair of frames for accommodating a battery pack and includes: two hollow end plates, each with a protruding front mounting part and a rear mounting part; and four parallel crossbeams, each connected between the two hollow end plates to form a through space for accommodating the battery pack. A crossbeam is positioned between two longitudinal beams. The front and rear connecting parts are respectively connected between the front connecting beam and the crossbeam, or respectively connected between the upper surface of the longitudinal beam and the crossbeam.

[0014] This invention can achieve one or more of the following technical effects: 1. Compared to ZL202411889954.2, the frame structure has been simplified, forming a through space to accommodate the battery pack, providing more space for installation and reducing weight by about 200kg, thus achieving lightweighting.

[0015] 2. A first rubber bushing and a second rubber bushing were installed, which improved the vibration resistance of the battery pack units on both sides and the battery pack unit in the middle.

[0016] 3. The second rubber bushing is arranged below the longitudinal beam, which reduces the space occupied.

[0017] 4. The arrangement of the middle battery pack moving forward can shift the center of gravity forward, increase the ground contact force of the front wheels, and free up the middle space to arrange electronic control components. It can also shorten the total length of the high-voltage line and facilitate wiring. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a perspective view of the battery pack unit of an electric commercial vehicle chassis structure according to a first preferred embodiment of the present invention.

[0020] Figure 2 for Figure 1 A schematic diagram of the middle part of the battery pack unit.

[0021] Figure 3 for Figure 1 A schematic diagram of the two sides of the battery pack unit.

[0022] Figure 4 for Figure 1 A schematic diagram of the installation of the first and second brackets of the battery pack unit.

[0023] Figure 5 for Figure 1 A schematic diagram showing the connection between the first and second brackets of the battery pack unit and the third and fourth mounting units.

[0024] Figure 6 for Figure 1 A schematic diagram showing the connection between the first and second brackets of the battery pack unit and the first to fourth mounting units.

[0025] Figure 7 for Figure 1 Side view of the battery pack unit.

[0026] Figure 8 This is a top view of the electric commercial vehicle chassis structure according to a first preferred embodiment of the present invention.

[0027] Figure 9 for Figure 8 A schematic diagram of the suspension system of the chassis structure of an electric commercial vehicle.

[0028] Figure 10 for Figure 9 Another perspective view of the central suspension system.

[0029] Figure 11This is a schematic diagram of the electric drive axle housing integrated box-shaped support arm forming a balanced beam in the electric commercial vehicle chassis structure according to the second preferred embodiment of the present invention.

[0030] Figure 12 This is a schematic diagram of the suspension system of an electric commercial vehicle chassis structure according to a third preferred embodiment of the present invention.

[0031] Figure 13 for Figure 12 Another perspective diagram of the air suspension system.

[0032] Figure 14-15 This is a schematic diagram of the suspension system of an electric commercial vehicle chassis structure according to a fourth preferred embodiment of the present invention.

[0033] Figure 16-17 This is a perspective view of the suspension system of an electric commercial vehicle chassis structure according to a fifth preferred embodiment of the present invention.

[0034] Figure 18-23 This is a perspective view of the suspension system of an electric commercial vehicle chassis structure according to the sixth to eleventh preferred embodiments of the present invention.

[0035] Figure 24 This is a perspective view of the electric commercial vehicle chassis structure according to the twelfth preferred embodiment of the present invention. Detailed Implementation

[0036] The preferred embodiments of the present invention will now be described with reference to the accompanying drawings. These specific embodiments are intended to illustrate the present invention in detail, but should not be construed as limiting the present invention. Various modifications and variations can be made without departing from the spirit and scope of the present invention, and all of these should be included within the protection scope of the present invention.

[0037] Example 1 According to a preferred embodiment of the present invention, an electric commercial vehicle chassis structure is provided, characterized in that it includes a battery pack unit, an air suspension system, and an electric drive axle arranged sequentially from front to rear. See also Figure 1-7 The battery pack unit includes: The first support 9 and the second support are located on the outside of the two longitudinal beams 60 and each includes a pair of spaced-apart connecting plates 91 located at the top and a pair of spaced-apart support arms 92 extending downward and beyond the bottom of the longitudinal beams. See Figure 3 A pair of frames 1 that can accommodate the battery pack; The first mounting unit 6 and the second mounting unit are disposed on the first side of each frame 1. Figure 3The frame 1 includes, on the side closest to the longitudinal beam: a vertical beam with a horizontally arranged central through hole at its upper part, and a first rubber bushing 7 fitted inside the central through hole; and a first support beam 5, connected to the bottom end of the vertical beam and used to support the bottom of the frame 1; and The first connecting beam 4 is used to connect the middle of the vertical beams of the first hanging unit and the second hanging unit, and its two ends are respectively connected to the two ends of the frame 1; The upper and lower parts of the vertical beam are connected to the frame 1, and the first rubber bushing 7 is movable between the pair of connecting plates 91 and its two ends are respectively connected to the pair of connecting plates.

[0038] According to another preferred embodiment of the present invention, see Figure 3 The frame is formed by connecting four parallel L-shaped longitudinal beams, four vertical beams, and four parallel transverse beams, which define a through space for accommodating the battery pack.

[0039] According to another preferred embodiment of the present invention, the battery pack unit further includes reinforcing ribs and / or skin disposed on the outer periphery of the frame.

[0040] According to another preferred embodiment of the present invention, see Figure 2 The electric commercial vehicle chassis structure also includes: The third and fourth mounting units are disposed on both sides of another frame that can accommodate a battery pack and each includes: a vertically arranged main body 83 with a horizontally arranged central through hole at the top and a second rubber bushing 81 fitted inside the central through hole; a connecting part 82 extending obliquely upward from the main body; and a second support beam 3, which connects the lower parts of the main body 83 of the third mounting unit and the lower parts of the main body of the fourth mounting unit to support the bottom of the frame 1 that can accommodate a battery pack. The second connecting beam 2 is used to connect the connecting parts 82 of the third and fourth hanging units and its two ends are respectively connected to the two ends of the frame 1 that can accommodate the battery pack. Among them, see Figure 5 The second rubber bushing 81 is movable between the pair of said arms 92 and its two ends are respectively connected to the pair of said arms.

[0041] Preferably, the two ends of the second rubber bushing 81 are respectively connected to the bottom ends of the pair of support arms. In other words, the second rubber bushing 81 is located below the longitudinal beam.

[0042] Example 2 This embodiment describes the chassis structure of a 4×2 electric commercial vehicle.

[0043] According to another preferred embodiment of the present invention, see Figure 8-10The present invention provides an electric commercial vehicle chassis structure according to a first preferred embodiment, characterized in that it includes: a front suspension system 100; a battery pack unit 200; a suspension system 300; an electric drive axle; and a reinforcing beam 400 located above the battery pack unit 200 between two longitudinal beams.

[0044] See Figure 9-10 The suspension system 300 includes a first suspension unit, which includes: V-shaped push rod 11 connects the tube beam 500 and the electric drive bridge 600; The upper ends of the first suspension bracket 18 and the second suspension bracket are at least partially overlapped and connected to both ends of the tube beam and the outer sides of the two longitudinal beams, respectively. A first equalizing beam 19 and a second equalizing beam are connected in the middle to the electric drive axle 600, and a first airbag 13 and a second airbag 13 are respectively provided at both ends; and The U-shaped composite stabilizer bar 17 has its two free ends connected to the middle of the first and second equalization beams, respectively. The U-shaped composite stabilizer bar 17 is formed by a first rod, a second rod, and a third rod connected in sequence to form a U-shape. The two ends of the second rod are respectively connected to the bottom ends of the first suspension bracket 18 and the second suspension bracket.

[0045] Preferably, the first suspension unit further includes: a first shock absorber 15 and a second shock absorber, the top ends of which are respectively connected to the two longitudinal beams via upper supports 14, and the bottom ends of which are respectively connected to the middle of the first equalizing beam and the second equalizing beam; and buffer blocks 16, which are respectively disposed on the outer sides of the two longitudinal beams. The first airbag 13 to the second airbag are respectively connected to the two longitudinal beams via upper brackets 12.

[0046] According to another preferred embodiment of the present invention, see Figure 11 ,and Figure 9-10 The first suspension unit structure is basically the same, the only difference being that the first equalizing beam 19 and the second equalizing beam are integrally cast with the electric drive axle housing. More specifically, the first equalizing beam 19 and the second equalizing beam are formed by extending a predetermined distance from the electric drive axle housing to both sides using box-shaped support arms. The lengths of the box-shaped support arms on both sides can be set differently as needed.

[0047] Preferably, the middle part of the first equalizing beam and the second equalizing beam is provided with a connecting seat 193 for connecting the U-shaped composite stabilizer bar 17 and two supports 192 for connecting the lower end of the first shock absorber, and the two ends are respectively provided with mounting seats 191 for connecting the bottom ends of the first airbag 13 and the second airbag.

[0048] According to another preferred embodiment of the present invention, see Figure 12-13 The suspension system 300 includes a first suspension unit, which includes: V-shaped push rod 21 connects the tube beam 500 and the electric drive bridge 600; The upper ends of the first suspension bracket 28 and the second suspension bracket are at least partially overlapped and connected to both ends of the tube beam 500 and the outer sides of the two longitudinal beams 60, respectively. A first equalizing beam 29 and a second equalizing beam are connected in the middle to the electric drive axle 600, and a first airbag 23 and a second airbag 23 are respectively provided at both ends; and The first lower thrust rod 27 and the second lower thrust rod are respectively connected between the bottom end of the first suspension bracket 28 and the middle part of the first equalizing beam 29, and between the bottom end of the second suspension bracket and the middle part of the second equalizing beam. The first airbag 23 and the second airbag are respectively connected to the two longitudinal beams via the upper bracket 22.

[0049] Preferably, the first suspension unit further includes: a first shock absorber 25 and a second shock absorber, the top ends of which are respectively connected to the two longitudinal beams via upper supports 24, and the bottom ends of which are respectively connected to the middle of the first equalizing beam and the second equalizing beam; and buffer blocks 26, which are respectively disposed on the outer side of the two longitudinal beams.

[0050] According to another preferred embodiment of the present invention, see Figure 14-15 The suspension system 300 includes a first suspension unit, which includes: V-shaped push rod 31 connects the tube beam 500 and the electric drive bridge 600; The upper ends of the first suspension bracket 38 and the second suspension bracket are at least partially overlapped and connected to both ends of the tube beam and the outer sides of the two longitudinal beams, respectively. The U-shaped composite torsion tube 37 has its two free ends connected to the bottom ends of the first suspension bracket 38 and the second suspension bracket, respectively; and The first airbag 33 and the second airbag are arranged vertically and connected between the U-shaped composite torsion tube 37 and the two longitudinal beams 60, respectively.

[0051] Preferably, the first air suspension unit further includes: a first shock absorber 35 and a second shock absorber, the top ends of which are respectively connected to the two longitudinal beams via upper supports 34, and the bottom ends of which are connected to a U-shaped composite torsion tube 37; and buffer blocks 36, which are respectively disposed on the outer sides of the two longitudinal beams. The first airbag 33 and the second airbag are respectively connected to the two longitudinal beams via upper brackets 32.

[0052] According to another preferred embodiment of the present invention, see Figure 16-17 The suspension system 300 includes a first suspension unit, which includes: X-shaped arm 41 connects the tube beam 500 and the electric drive bridge 600; The upper ends of the first suspension bracket 48 and the second suspension bracket are at least partially overlapped and connected to both ends of the tube beam and the outer sides of the two longitudinal beams 60, respectively. The first and second equalizing beams are connected in the middle to the electric drive axle 600, and the first and second airbags 43 are respectively installed at both ends; and The first lower thrust rod 44 and the second lower thrust rod are respectively connected between the bottom end of the first suspension bracket 48 and the middle part of the first equalizing beam, and between the bottom end of the second suspension bracket and the middle part of the second equalizing beam. The first airbag 43 and the second airbag are respectively connected to the two longitudinal beams via the upper bracket 42.

[0053] Preferably, the first air suspension unit further includes: a first shock absorber 45 and a second shock absorber, the top ends of which are respectively connected to the two longitudinal beams via upper supports 44, and the bottom ends of which are respectively connected to the middle of the first equalizing beam and the second equalizing beam; and buffer blocks 46, which are respectively disposed on the outer side of the two longitudinal beams.

[0054] Example 3 This embodiment describes a 6×4 electric commercial vehicle chassis structure, which is similar to the 4×2 electric commercial vehicle chassis structure in Embodiment 2, except that the suspension system 300 is the only difference.

[0055] Specifically, according to another preferred embodiment of the present invention, see [link to previous section]. Figure 18 The suspension system 300 includes two mirror-arranged first suspension units sharing a common tube beam 500 with a first suspension bracket 18 and a second suspension bracket. These first suspension units are connected to... Figure 9-10 The first suspension unit in the system has the same structure.

[0056] According to another preferred embodiment of the present invention, see Figure 19 The suspension system 300 includes two first suspension units arranged sequentially along the longitudinal beam, the first suspension units being connected to... Figure 9-10 The first suspension unit in the system has the same structure.

[0057] According to another preferred embodiment of the present invention, see Figure 20 The suspension system 300 includes two mirror-arranged first suspension units sharing a common tube beam 500 with a first suspension bracket 18 and a second suspension bracket. These first suspension units are connected to... Figure 12-13 The first suspension unit in the system has the same structure.

[0058] Similarly, the suspension system 300 may include two first suspension units arranged sequentially along a longitudinal beam, the first suspension units being connected to... Figure 12-13 The first suspension unit in the system has the same structure.

[0059] According to another preferred embodiment of the present invention, see Figure 21 The suspension system 300 includes two first suspension units arranged sequentially along the longitudinal beam, the first suspension units being connected to... Figure 14-15The first suspension unit in the system has the same structure.

[0060] Similarly, the suspension system 300 may include two mirror-arranged first suspension units sharing a common tube beam 500 with the first suspension bracket 18 and the second suspension bracket, the first suspension unit being... Figure 14-15 The first suspension unit in the system has the same structure.

[0061] According to another preferred embodiment of the present invention, see Figure 22 The suspension system 300 includes two mirror-arranged first suspension units sharing a common tube beam 500 with a first suspension bracket 18 and a second suspension bracket. These first suspension units are connected to... Figure 16-17 The first suspension unit in the system has the same structure.

[0062] Similarly, the suspension system 300 may include two first suspension units arranged sequentially along a longitudinal beam, the first suspension units being connected to... Figure 16-17 The first suspension unit in the system has the same structure.

[0063] According to another preferred embodiment of the present invention, see Figure 23 The suspension system 300 is a leaf spring suspension system and includes: The tube beam is 500mm long and is positioned between two longitudinal beams. The first balance suspension bracket 53 and the second balance suspension bracket have their upper ends at least partially overlapped and connected to both ends of the tube beam and the outer sides of the two longitudinal beams, respectively. The first V-shaped push rod 51 and the second V-shaped push rod are connected between the tube beam 500 and the electric drive bridge 600 and are arranged in a mirror image of the tube beam 500. The pull-down horizontal plate 52 is connected at both ends to the lower ends of the first balance suspension bracket and the lower ends of the second balance suspension bracket, respectively. The first lower straight-pull thrust rod 56 and the second straight-pull thrust rod are respectively connected between the lower end of the first balance suspension bracket 53 and the first end of the electric drive axle, and between the lower end of the second balance suspension bracket and the second end of the electric drive axle. The first leaf spring 54 and the second leaf spring are respectively connected to the first balance suspension bracket 53 and the second balance suspension bracket via leaf spring seat 55 in the middle, and are respectively connected to the electric drive axle at both ends.

[0064] Example 4 This embodiment is based on embodiment 2 ( Figure 8 Based on this, see [link / reference]. Figure 24 The battery pack between the two longitudinal beams (located in the middle) is moved forward to the front connecting beam.

[0065] Specifically, a connecting unit can be provided between the first support beams 5 of the first hanging units on both sides, and this connecting unit is connected to... Figure 2The third mounting unit 8 has a similar structure and includes: a second support beam 3; and vertical main body parts 83 disposed at both ends of the second support beam, with a horizontally arranged central through hole at the top and a second rubber bushing 81 fitted inside the central through hole. The second rubber bushing 81 is movable between the pair of support arms 92 and its two ends are respectively connected to the pair of support arms. The two ends of the second support beam 3 are connected to the first support beam 5. It can be understood that the connecting unit omits the connecting part 82 and the connecting beam 2 of the third mounting unit 8.

[0066] Preferably, the forward-moving battery pack adopts a different frame structure and hanging method. Specifically, the battery pack frame includes: two hollow end plates, each with an outwardly protruding front hanging part and a rear hanging part 201; and four parallel crossbeams, which are respectively connected between the two hollow end plates to form a through space for accommodating the battery pack. The front hanging part and the rear hanging part 201 are respectively hung on the front connecting beam and the crossbeam 700.

[0067] Preferably, the front and rear attachment portions are provided with vertical central through holes to accommodate rubber bushings, which are stacked on the front connecting beam and the crossbeam and connected by bolts. Alternatively, the front attachment portion can be stacked and attached to the upper surface of the two longitudinal beams.

[0068] This invention can achieve one or more of the following technical effects: 1. Compared to ZL202411889954.2, the frame structure has been simplified, forming a through space to accommodate the battery pack, providing more space for installation and reducing weight by about 200kg, thus achieving lightweighting.

[0069] 2. A first rubber bushing and a second rubber bushing were installed, which improved the vibration resistance of the battery pack units on both sides and the battery pack unit in the middle.

[0070] 3. The second rubber bushing is arranged below the longitudinal beam, which reduces the space occupied.

[0071] 4. The arrangement of the middle battery pack moving forward can shift the center of gravity forward, increase the ground contact force of the front wheels, and free up the middle space to arrange electronic control components. It can also shorten the total length of the high-voltage line and facilitate wiring.

[0072] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A chassis structure for an electric commercial vehicle, characterized in that... The battery pack unit, air suspension system, and electric drive axle are arranged sequentially from front to back. The battery pack unit includes: The first and second supports are located on the outside of the two longitudinal beams and each includes a pair of spaced-apart connecting plates at the top and a pair of spaced-apart support arms extending downward and beyond the bottom of the longitudinal beams. A pair of frames to accommodate the battery pack; The first and second mounting units are disposed on the first side of each frame and each includes: a vertical beam with a horizontally arranged central through hole at its upper part and a first rubber bushing fitted inside the central through hole; and a first support beam connected to the bottom end of the vertical beam and used to support the bottom of the frame; and The first connecting beam is used to connect the middle of the vertical beams of the first and second hanging units and its two ends are respectively connected to the two ends of the frame; The upper and lower parts of the vertical beam are connected to the frame, and the first rubber bushing is movable between the pair of connecting plates and its two ends are respectively connected to the pair of connecting plates; The electric commercial vehicle chassis structure also includes: The third and fourth mounting units are disposed on both sides of another frame capable of accommodating a battery pack and each includes: a vertically arranged main body with a horizontally arranged central through hole at the top and a second rubber bushing fitted inside the central through hole; a connecting part extending obliquely upward from the main body; and a second support beam connecting the lower parts of the main bodies of the third and fourth mounting units to support the bottom of the frame capable of accommodating the battery pack; and The second connecting beam is used to connect the connecting parts of the third and fourth mounting units and its two ends are respectively connected to the two ends of the frame that can accommodate the battery pack. The second rubber bushing is movable between the pair of said arms and its two ends are respectively connected to the pair of said arms; The second support beam is connected to the first support beam at both ends.

2. The electric commercial vehicle chassis structure according to claim 1, characterized in that... The frame is formed by connecting four parallel L-shaped longitudinal beams, four vertical beams, and four parallel transverse beams, defining a through space for accommodating the battery pack.

3. The electric commercial vehicle chassis structure according to claim 1, characterized in that... The air suspension system includes a first suspension unit, which includes: V-shaped push rods connect the tubular beam and the electric drive bridge; The upper ends of the first suspension bracket and the second suspension bracket are at least partially overlapped and connected to both ends of the tube beam and the outer sides of the two longitudinal beams, respectively. The first and second equalizing beams are connected in the middle to the electric drive axle, and the first and second airbags are respectively installed at both ends; and The U-shaped composite stabilizer bar has its two free ends connected to the middle of the first and second equalization beams, respectively. The U-shaped composite stabilizer bar is formed by connecting a first rod, a second rod, and a third rod in sequence to form a U-shape. The two ends of the second rod are connected to the bottom ends of the first suspension bracket and the second suspension bracket, respectively.

4. The electric commercial vehicle chassis structure according to claim 1, characterized in that... The air suspension system includes a first suspension unit, which includes: V-shaped push rods connect the tubular beam and the electric drive bridge; The upper ends of the first suspension bracket and the second suspension bracket are at least partially overlapped and connected to both ends of the tube beam and the outer sides of the two longitudinal beams, respectively. The first and second equalizing beams are connected in the middle to the electric drive axle, and the first and second airbags are respectively installed at both ends; and The first lower thrust rod and the second lower thrust rod are respectively connected between the bottom end of the first suspension bracket and the middle part of the first equalizer beam, and between the bottom end of the second suspension bracket and the middle part of the second equalizer beam. The first airbag and the second airbag are respectively connected to the two longitudinal beams via an upper bracket.

5. The electric commercial vehicle chassis structure according to claim 1, characterized in that... The air suspension system includes a first suspension unit, which includes: V-shaped push rods connect the tubular beam and the electric drive bridge; The upper ends of the first suspension bracket and the second suspension bracket are at least partially overlapped and connected to both ends of the tube beam and the outer sides of the two longitudinal beams, respectively. The U-shaped composite torsion tube has its two free ends connected to the bottom ends of the first suspension bracket and the second suspension bracket, respectively; and The first and second airbags are arranged vertically and connected between the U-shaped composite torsion tube and the two longitudinal beams, respectively.

6. The electric commercial vehicle chassis structure according to claim 1, characterized in that... The air suspension system includes a first suspension unit, which includes: X-shaped arm connects the tubular beam and the electric drive bridge; The upper ends of the first suspension bracket and the second suspension bracket are at least partially overlapped and connected to both ends of the tube beam and the outer sides of the two longitudinal beams, respectively. The first and second equalizing beams are connected in the middle to the electric drive axle, and the first and second airbags are respectively installed at both ends; and The first lower thrust rod and the second lower thrust rod are respectively connected between the bottom end of the first suspension bracket and the middle part of the first equalizer beam, and between the bottom end of the second suspension bracket and the middle part of the second equalizer beam. The first airbag and the second airbag are respectively connected to the two longitudinal beams via an upper bracket.

7. The electric commercial vehicle chassis structure according to any one of claims 3-4 and 6, characterized in that... The first and second equalizing beams are integrally cast with the electric drive axle housing.

8. The electric commercial vehicle chassis structure according to claim 7, characterized in that... The air suspension system includes two first suspension units arranged sequentially along the longitudinal beam; or, the air suspension system includes two mirror-arranged first suspension units sharing a tube beam and a first suspension bracket and a second suspension bracket; or the air suspension system is replaced by a leaf spring suspension system.

9. A chassis structure for an electric commercial vehicle, characterized in that... The battery pack unit, air suspension system, and electric drive axle are arranged sequentially from front to back. The battery pack unit includes: The first and second supports are located on the outside of the two longitudinal beams and each includes a pair of spaced-apart connecting plates at the top and a pair of spaced-apart support arms extending downward and beyond the bottom of the longitudinal beams. A pair of frames to accommodate the battery pack; The first and second mounting units are disposed on the first side of each frame and each includes: a vertical beam with a horizontally arranged central through hole at its upper part and a first rubber bushing fitted inside the central through hole; and a first support beam connected to the bottom end of the vertical beam and used to support the bottom of the frame; and The first connecting beam is used to connect the middle of the vertical beams of the first and second hanging units and its two ends are respectively connected to the two ends of the frame; The upper and lower parts of the vertical beam are connected to the frame; the first rubber bushing is movable between the pair of connecting plates and its two ends are respectively connected to the pair of connecting plates; a second support beam is connected between the first support beams; The electric commercial vehicle chassis structure also includes: Another frame for accommodating a battery pack, positioned in front of the pair of frames for accommodating the battery pack, includes: two hollow end plates, each with a protruding front and rear mounting portion; and four parallel crossbeams connected between the two hollow end plates to form a through space for accommodating the battery pack; and A crossbeam is positioned between two longitudinal beams. The front and rear connecting parts are respectively connected between the front connecting beam and the crossbeam, or respectively connected between the upper surface of the longitudinal beam and the crossbeam.

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