A liftable electric drive axle air suspension system and vehicle

Abstract

The application provides a liftable electric drive axle air suspension system and a vehicle, which comprises an electric drive axle housing, two sides of the electric drive axle housing are provided with electric drive assemblies; at least two lifting elements are arranged, the two lifting elements are symmetrically arranged relative to the longitudinal center of the vehicle and are located above the electric drive axle housing, the top of the lifting element can be lifted along the height direction of the vehicle; a first support is fixedly connected to the vehicle frame and is located above the electric drive axle housing, the first support is fixedly connected to the bottom of the lifting element and is used for supporting the lifting element; a second support is arranged above the electric drive axle housing and is used for connecting the top of the lifting element with the electric drive axle housing, the second support can drive the electric drive axle housing to be lifted or lowered together when the top of the lifting element is lifted or lowered; the application has compact structure and high space utilization rate, the layout fully utilizes the limited space of the chassis, saves the installation space of the middle part of the vehicle frame and avoids the interference problem with other components.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a liftable air suspension system for electric drive axle and a vehicle. BACKGROUND

[0002] The main load-bearing element of the air suspension is the air spring (hereinafter referred to as air bag), which has the advantages of low frequency, good vehicle smoothness, constant chassis height under empty and full load, adjustable chassis height, etc., and is widely used in heavy trucks.

[0003] For a pure electric heavy truck, using an electric drive axle is an important technical route. The drive motor and the reducer are integrated on the front and rear sides of the electric drive axle housing respectively. There is no transmission shaft between the two electric drive axles. When the vehicle is empty, if one of the electric drive axles is lifted off the ground and only the other electric drive axle is used for driving, the power consumption can be saved and the tire wear can be reduced. However, the space occupied by the electric motor and the transmission on both sides of the electric drive axle is large, and the traditional air bag lifting mechanism cannot be arranged.

[0004] In the prior art, a patent with the application number CN108891218B discloses a lifting air suspension system. The lifting air suspension system includes a vehicle frame, an axle, two lifting air bags, and two transmission mechanisms. The two lifting air bags are arranged on both sides of the vehicle frame. One end of each transmission mechanism is connected to one lifting air bag, and the other end is connected to one side of the axle. Although the two lifting air bags are arranged on both sides of the vehicle frame, the middle installation space is saved. However, the lifting air bag occupies the space of the load-bearing air bag, which requires a large wheelbase to be arranged, and is not suitable for a tractor.

[0005] In addition, a patent with the application number CN209795094U also discloses a new type of air suspension device and an axle lifting mechanism. The axle lifting mechanism includes an upper mounting arm and a lower rotating arm. A lifting air bag is arranged between the end of the upper mounting arm and the corresponding end of the lower rotating arm. The other end of the lower rotating arm is provided with a jacking part for guiding the arm. The lifting air bag is no longer located below the support frame. The lifting air bag occupies the height of the support frame in the up-down direction, reduces the occupied height of the structure below the support frame, and increases the ground clearance of the vehicle. This structure occupies a large space and is only suitable for a driven axle, but not for an electric drive axle. SUMMARY

[0006] The present application provides a liftable air suspension system for electric drive axle and a vehicle to solve the problem of large space occupied by the existing lifting structure in the prior art, which makes it difficult to lift the electric drive axle.

[0007] The present application provides a liftable air suspension system for electric drive axle, which comprises:

[0008] An electric drive axle housing is provided with an electric drive assembly on both sides.

[0009] The lifting elements are arranged symmetrically relative to the longitudinal center of the vehicle and are located above the electric drive axle housing, and the top of the lifting elements can be lifted in the height direction of the vehicle;

[0010] The first support is fixedly connected to the vehicle frame and is located above the electric drive axle housing, and the first support is fixedly connected to the bottom of the lifting element to support the lifting element;

[0011] The second support is arranged above the electric drive axle housing and is used to connect the top of the lifting element to the electric drive axle housing, and the second support can drive the electric drive axle housing to rise or fall together when the top of the lifting element rises or falls.

[0012] The lifting elements are arranged symmetrically relative to the longitudinal center of the vehicle and are located above the electric drive axle housing, and the top of the lifting elements can be lifted in the height direction of the vehicle;

[0013] The lifting elements are arranged symmetrically relative to the longitudinal center of the vehicle and are located above the electric drive axle housing, and the top of the lifting elements can be lifted in the height direction of the vehicle;

[0014] The lifting elements are arranged symmetrically relative to the longitudinal center of the vehicle and are located above the electric drive axle housing, and the top of the lifting elements can be lifted in the height direction of the vehicle;

[0015] The lifting elements are arranged symmetrically relative to the longitudinal center of the vehicle and are located above the electric drive axle housing, and the top of the lifting elements can be lifted in the height direction of the vehicle;

[0016] The lifting elements are arranged symmetrically relative to the longitudinal center of the vehicle and are located above the electric drive axle housing, and the top of the lifting elements can be lifted in the height direction of the vehicle;

[0017] The liftable electric drive axle air suspension system provided by the application is provided with a limiting structure on the outer side of the vehicle frame, and the top of the electric drive axle housing is provided with a pressing plate corresponding to the limiting structure.

[0018] In a second aspect, the application further provides a vehicle, comprising a middle axle and a rear axle, wherein the rear axle is provided with the liftable electric drive axle air suspension system as described in the first aspect.

[0019] The vehicle provided by the application is provided with a plurality of second load-bearing air bags on the middle axle, and the second load-bearing air bags are connected in parallel through a third pipeline, and at least one second load-bearing air bag is connected with a second pressure sensor.

[0020] The vehicle provided by the application further comprises a solenoid valve, wherein the air inlet of the solenoid valve is connected with the air reservoir, and the three working ports of the solenoid valve are connected with the third pipeline, the first pipeline and the second pipeline of the liftable electric drive axle air suspension system respectively.

[0021] The liftable electric drive axle air suspension system provided by the application comprises an electric drive axle housing, a lifting element, a first support and a second support, wherein the two lifting elements are arranged above the electric drive axle and are arranged on the left and right sides respectively and are located above the electric drive axle housing, so that the structure is compact and the space utilization rate is high. This layout makes full use of the limited space of the chassis, saves the installation space in the middle of the vehicle frame, avoids the interference problem with other components, reduces the overall weight and volume, and realizes the height adjustment of the electric drive axle housing through the lifting function of the lifting element. The lifting element is connected with the electric drive axle housing through the second support, so that the housing can be lifted synchronously with the lifting element, thereby realizing stable height adjustment. This design can effectively absorb the road impact and improve the driving comfort. The symmetrical arrangement of the two lifting elements ensures that the forces on both sides of the vehicle are balanced, thereby further improving the handling performance. The split design of the lifting element, the first support and the second support makes the whole system more modular, which is convenient for installation and maintenance. If a fault occurs, the lifting element, the first support and the second support can be replaced individually without the need to disassemble the whole system. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0023] Figure 1 It is a structural schematic diagram of the liftable electric drive axle air suspension system provided by the embodiment of the application.

[0024] Figure 2 is a structural schematic diagram of an electric drive assembly provided by an embodiment of the present application.

[0025] Figure 3 is a sectional view of a lifting element provided by an embodiment of the present application.

[0026] Figure 4 is a structural schematic diagram of an electric drive axle in a normal load state provided by an embodiment of the present application.

[0027] Figure 5 is a structural schematic diagram of an electric drive axle in a lifting state provided by an embodiment of the present application.

[0028] Figure 6 is a control principle diagram of an air suspension of a vehicle in a middle axle and a rear axle air circuit provided by an embodiment of the present application.

[0029] Reference signs:

[0030] 1, frame; 2, electric drive axle housing; 3, lifting element; 4, first support; 5, second support; 6, first load air bag; 7, equalizing beam; 8, first pipeline; 9, second pipeline; 10, second load air bag; 11, third pipeline; 12, limiting structure; 13, pressing plate; 14, electromagnetic valve; 15, V-shaped thrust rod; 16, V-shaped thrust rod support; 17, lower thrust rod support; 18, U-shaped bolt; 19, lower thrust rod; 20, drive motor; 21, transmission; 22, air port; 23, threaded hole. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0032] The present application will be described below in combination with Figures 1-6 An electric drive axle air suspension system and a vehicle are described.

[0033] An electric drive axle air suspension system provided by an embodiment of the present application comprises: an electric drive axle housing 2, a lifting element 3, a first support 4 and a second support 5.

[0034] The two sides of the electric drive axle housing 2 are provided with electric drive assemblies, and the electric drive assemblies comprise a drive motor 20 and a transmission 21; at least two lifting elements 3 are arranged on the inner side of the vehicle frame 1 in a symmetrical manner relative to the longitudinal center of the vehicle and are located directly above the electric drive axle housing 2, and the top of the lifting element 3 can be lifted in the height direction of the vehicle; the first support 4 is fixedly connected to the vehicle frame 1 and is located above the electric drive axle housing 2, the first support 4 is fixedly connected to the bottom of the lifting element 3 and is used for supporting the lifting element 3; the second support 5 is arranged above the electric drive axle housing 2 and is used for connecting the top of the lifting element 3 to the electric drive axle housing 2, and the second support 5 can drive the electric drive axle housing 2 to rise or fall together when the top of the lifting element 3 rises or falls.

[0035] According to the above scheme, the two lifting elements 3 are arranged directly above the electric drive axle and are arranged on the left and right sides, and are located directly above the electric drive axle housing 2, which has a compact structure and high space utilization rate. This layout makes full use of the limited space of the chassis, saves the installation space in the middle of the vehicle frame 1, avoids interference with other components, reduces the overall weight and volume, and realizes height adjustment of the electric drive axle housing 2 through the lifting function of the lifting element 3. The second support 5 connects the lifting element 3 and the electric drive axle housing 2, so that the axle housing can rise and fall synchronously with the lifting element 3, thereby realizing stable height adjustment. This design can effectively absorb road impact and improve ride comfort. The symmetrical arrangement of the two lifting elements 3 ensures that the forces on both sides of the vehicle are balanced, further improving the handling performance. The split design of the lifting element 3, the first support 4 and the second support 5 makes the entire system more modular, facilitating installation and maintenance. If a fault occurs, the lifting element 3, the first support 4 and the second support 5 can be replaced individually without the need to disassemble the entire system.

[0036] As shown in Figure 1 , Figure 3 , the lifting element 3 is a lifting air bag, and two small lifting air bags are used to make full use of the limited space of the chassis and to enhance the stability of the lifting system. The lifting air bag comprises a cover plate and a bottom plate, both of which are metal plates. The cover plate is connected to the second support 5 and is provided with a gas inlet 22 for supplying gas to the lifting air bag. The bottom plate is connected to the first support 4. The cover plate and the second support 5 can be connected by welding or bolts. The bottom plate and the first support 4 can be connected by welding or bolts. In order to facilitate maintenance, the bottom plate and the cover plate are connected and fixed by bolts.

[0037] As preferred, the lifting air bag is a single-curved-bag air spring, the middle part is a rubber bag, the bottom plate and the cover plate are metal plates, the upper cover plate is provided with a gas port 22 and a threaded hole 23, the gas port 22 is the air inlet and outlet of the lifting air bag, the threaded hole 23 is used for being connected with the second support 5 through a bolt, and the lower bottom plate is provided with a threaded hole 23 and is used for being connected with the first support 4 through a bolt.

[0038] It should be noted that, as shown in Figure 1 The lifting element 3 of the present application is arranged in the second drive axle in the double drive axle, which is referred to as the rear axle, and the first drive axle is referred to as the middle axle and can only bear the load without the lifting function.

[0039] In the embodiment, the equalizing beam 7 is fixedly connected to the electric drive axle housing 2, and the plurality of first bearing air bags 6 are uniformly distributed in the rear drive axle of the vehicle and are connected in parallel through the first pipeline 8, at least one first bearing air bag 6 is connected with a first pressure sensor, the cover plate at the upper end of the bearing air bag is fixedly connected with the vehicle frame 1, the piston at the lower end of the bearing air bag is fixedly connected with the equalizing beam 7, and the bearing air bag is used for bearing the vertical load of the vehicle.

[0040] In this way, the plurality of first bearing air bags 6 are connected in parallel through the first pipeline 8, which ensures the consistency of the air pressure of the air bags and avoids the tilting of the vehicle body, and the design of parallel connection enables the plurality of first bearing air bags 6 to share the same air source, reducing the complexity of independent control, even if only one first bearing air bag 6 is connected with a pressure sensor, the state of other bearing air bags can also be indirectly reflected, ensuring that the air bag works within the normal pressure range, and if the air pressure is too high or too low, the system can timely adjust the air charging and discharging of the air bag through the control unit, avoiding the imbalance of the vehicle posture or other faults caused by abnormal air pressure.

[0041] As shown in Figure 1 The first bearing air bag 6 is provided with four air bags, which are uniformly distributed below the vehicle frame 1, the equalizing beam 7 is fixed on the electric drive axle housing 2 through the U-shaped bolt 18, and the four bearing air bags bear the vertical load of the vehicle; when the lifting air bag drives the electric drive axle housing 2 to rise, the equalizing beam 7 is fixedly connected with the electric drive axle housing 2, so that the equalizing beam 7 is driven to rise together, therefore, when the lifting air bag acts, the gas in the first bearing air bag 6 needs to be emptied first to avoid interfering with the lifting of the electric drive axle housing 2.

[0042] In a specific embodiment, the first support 4 is L-shaped and includes a first fixed plate and a second fixed plate, the first fixed plate is connected with the inner side of the vehicle frame 1, and the second fixed plate is connected with the bottom plate of the lifting air bag.

[0043] Optionally, the first fixing plate is parallel to the inner side of the vehicle frame 1, and the first fixing plate is welded or bolted to the inner side of the vehicle frame 1; the second fixing plate is perpendicular to the first fixing plate, and the second fixing plate is bolted to the bottom plate of the lifting air bag, facilitating disassembly and assembly of the lifting air bag.

[0044] As shown in Figure 1 , Figure 4 and Figure 5 , in one specific embodiment, the second support 5 is in the shape of an inverted "U", capable of simultaneously fixing and connecting two lifting air bags on both sides to the electric drive axle housing 2, including a middle connecting plate, a first end plate and a second end plate. The middle connecting plate is located in the middle of the second support 5, and the middle connecting plate is connected to the electric drive axle housing 2. The first end plate is connected to the cover plate of one lifting air bag, and the second end plate is connected to the cover plate of the other lifting air bag.

[0045] Further, the first support 4 and the second support 5 are both provided with reinforcing ribs to improve the structural stability and reliability of the supports.

[0046] In this embodiment, the two lifting air bags are connected in parallel through the second pipeline 9, and at least one lifting air bag is connected with a second pressure sensor for detecting the air pressure of the lifting air bag.

[0047] In this way, the two lifting air bags are connected in parallel through the second pipeline 9, ensuring the consistency of the air pressure of the two air bags, thereby ensuring the consistency of the height of the vehicle on both sides, avoiding tilting of the vehicle body. The design of parallel connection makes the two air bags share the same air source, reducing the complexity of independent control. Even if only one air bag is connected with a pressure sensor, the state of the other air bag can also be indirectly reflected, ensuring that the air bag works within the normal pressure range. If the air pressure is too high or too low, the system can adjust the air charging and discharging of the air bag in time through the control unit, avoiding the imbalance of the vehicle posture or other faults caused by abnormal air pressure.

[0048] As a preferred, the outer side of the vehicle frame 1 is provided with a limiting structure 12, and the top of the electric drive axle housing 2 is provided with a pressing plate 13 corresponding to the limiting structure 12. The limiting structure 12 can be a limiting support, which is used to limit the continuous upward movement of the electric drive axle housing 2 when the cover plate of the lifting air bag is lifted, driving the second support 5 and the electric drive axle housing 2 to move upward at the same time, and the pressing plate 13 is in contact with the limiting support after being lifted into place. The bottom of the limiting support is made of flexible material such as rubber to avoid rigid contact with the electric drive axle housing 2, causing structural damage and damage.

[0049] As shown in Figure 1 , the load bearing mechanism of the liftable electric drive axle air suspension system is a four-link air suspension, which includes a first load bearing air bag 6, an equalizing beam 7, a V-shaped thrust rod support 16, a V-shaped thrust rod 15, a lower thrust rod support 17 and a lower thrust rod 19.

[0050] The top of the lower push rod support 17 is fixed to the frame 1 by bolts, the bottom is hinged to one end of the lower push rod 19, the other end of the lower push rod 19 is hinged to the equalizing beam 7, the two free ends of the V-shaped push rod 15 are hinged to the two V-shaped push rod supports 16 respectively, and the bent part is hinged to the upper end of the electric drive axle housing 2 through the intermediate support; the V-shaped push rod 15 and the lower push rod 19 jointly bear the longitudinal load of the vehicle, and the V-shaped push rod 15 simultaneously bears the lateral load. The two ends of the second support 5 are connected to the cover plate of the lifting air bag by bolts, and the middle part is fixedly connected to the electric drive axle housing 2 and the intermediate support by bolts, and the cover plate of the lifting air bag, the second support 5, the electric drive axle housing 2 and the V-shaped push rod 15 move together.

[0051] The embodiment of the present application also provides a vehicle, comprising: a middle axle and a rear axle, and the rear axle is provided with the liftable electric drive axle air suspension system.

[0052] In the embodiment, the middle axle is uniformly provided with a plurality of second bearing air bags 10, which can be four, and the plurality of second bearing air bags 10 are connected in parallel through the third pipeline 11, and at least one second bearing air bag 10 is connected with a third pressure sensor.

[0053] In this way, the plurality of second bearing air bags 10 are connected in parallel through the third pipeline 11, which ensures the consistency of the air pressure of the air bags and avoids the tilting of the vehicle body, and the parallel connection design makes the plurality of second bearing air bags 10 share the same air source, reduces the complexity of independent control, and even if only one second bearing air bag 10 is connected with a pressure sensor, the state of other bearing air bags can also be indirectly reflected, so that the air bags can work within the normal pressure range, and if the air pressure is too high or too low, the system can timely adjust the air charging and discharging of the air bags through the control unit, so as to avoid the imbalance of the vehicle posture or other faults caused by abnormal air pressure.

[0054] Further, an electromagnetic valve 14 is further included, the air inlet 22 of the electromagnetic valve 14 is connected with the air reservoir, and the three working ports of the electromagnetic valve 14 are respectively connected with the third pipeline 11, the first pipeline 8 and the second pipeline 9 of the liftable electric drive axle air suspension system.

[0055] In this way, the electromagnetic valve 14 as a key control element can flexibly distribute the compressed air in the air reservoir to different pipelines according to the actual needs of the vehicle, and the multi-way distribution design makes the system can accurately adjust the air flow direction and flow under different working conditions such as lifting or lowering, and the accurate air flow control can also avoid overcharging or over-discharging, thereby improving the stability and reliability of the system.

[0056] The electromagnetic valve 14 can be connected with the electronic control unit ECU of the vehicle, and receives real-time data input from the pressure sensor, so as to realize intelligent control, such as dynamically optimizing the air bag pressure combined with load changes. By combining the use of the pressure sensor, the overcharging of the air bag can be avoided to cause explosion, or the insufficient air bag pressure can be prevented to affect the supporting performance, so as to improve the reliability and stability of the system.

[0057] In addition, through different working state combinations of the electromagnetic valve 14, the system can also realize multiple working modes, an independent control mode: respectively controlling the air flow of the first pipeline 8 and the second pipeline 9 to meet the independent needs of the electric drive axle air suspension and the lifting air bag. A priority mode: in the case of limited resources, preferentially supplying air to one pipeline to ensure the normal operation of the key function.

[0058] In a specific embodiment, the liftable electric drive axle air suspension control system is used for air supply control of a double drive axle air suspension, the middle axle has no lifting function, the rear axle has lifting function, and there are ten air bags in the whole vehicle, eight of which are used for bearing and two of which are used for lifting.

[0059] Referring to Figure 6 , the air path control principle of the liftable electric drive axle air suspension is divided into two parts, the first part is to control the middle axle air suspension without lifting function, and the second part is to control the rear axle air suspension with lifting function, and the two parts are controlled by one electromagnetic valve 14.

[0060] As Figure 6 shown, the middle axle air suspension without lifting function is controlled by one working port of the electromagnetic valve 14, and the control strategy is to keep the bearing air bag at a set height under different loads by charging and discharging. The four second bearing air bags 10 of the middle axle air suspension are connected in parallel, one of which is connected with a third pressure sensor for monitoring the air pressure of the four second bearing air bags 10. The rear axle air suspension with lifting function is controlled by the second working port of the electromagnetic valve 14, and is connected with the four parallel first bearing air bags 6 of the rear axle, one of which is connected with a first pressure sensor to monitor the air pressure of the four first bearing air bags 6. The third working port of the electromagnetic valve 14 is connected with the two parallel lifting air bags of the rear axle, one of which is connected with a second pressure sensor to monitor the internal air pressure of the two lifting air bags.

[0061] Referring to Figures 4-5 , two working states of the electric drive axle lifting air suspension system are given:

[0062] Full load running state: the electric drive axle is not lifted when the vehicle is full loaded, at this time the electric drive axle air suspension system can be lifted, the two lifting air bags are deflated by the electromagnetic valve 14, then the four first load bearing air bags 6 are inflated until the distance from the axle center to the lower surface of the frame 1 reaches the calibrated suspension height H, the system is controlled to keep the four first load bearing air bags 6 at this height under different loads.

[0063] Electric drive axle lifting state: when the vehicle is empty, lifting the rear axle can save electricity, after the driver gives a lifting instruction, the electromagnetic valve 14 first deflates the first load bearing air bag 6, then inflates the lifting air bag, the cover plate of the lifting air bag rises, driving the second support 5 and the electric drive axle housing 2 to rise at the same time, until the pressing plate 13 fixed to the axle housing collides with the limiting support, the electromagnetic valve 14 continues to inflate the lifting air bag to the set air pressure, at this time the upward force generated by the two lifting air bags is equal to the sum of the electric drive axle containing the wheel weight and the downward force of the limiting support on the electric drive axle, the electric drive axle is in a lifting balance state, at this time the suspension height is H-H1, the electric drive axle is lifted by H1.

[0064] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A liftable electrically driven axle air suspension system, characterized in that The utility model relates to an electric drive axle housing (2) is provided with electric drive assembly on both sides, and the utility model relates to a lifting element (3) is arranged in the inside of frame (1) relative to the longitudinal center of vehicle symmetry, and is located the upside of electric drive axle housing (2), the top of lifting element (3) can be lifted along the height direction of vehicle, and the utility model relates to a first support (4) is fixedly connected with frame (1) and is located the upside of electric drive axle housing (2), and the bottom of first support (4) is fixedly connected with lifting element (3) for supporting lifting element (3), and the utility model relates to a second support (5) is arranged in the upside of electric drive axle housing (2) for connecting the top of lifting element (3) with electric drive axle housing (2), and second support (5) can drive electric drive axle housing (2) to rise or fall together when the top of lifting element (3) rises or falls. The utility model relates to a lifting element (3) is lifting air bag, including cover and bottom plate, the cover is connected with second support (5), and the cover is provided with air port (22) for supplying air to lifting air bag, and the bottom plate is connected with first support (4). The utility model relates to a second support (5) is inverted " several " shape, including middle connecting plate, first end plate and second end plate, the middle connecting plate is located in the middle of second support (5), and the middle connecting plate is connected with electric drive axle housing (2), and the first end plate is connected with the cover of one lifting air bag, and the second end plate is connected with the cover of another lifting air bag. The utility model relates to V-shaped thrust rod (15), and the bending part of V-shaped thrust rod (15) is hinged with the upper end of electric drive axle housing (2) through intermediate support. The utility model relates to the both ends of second support (5) are connected with the cover of lifting air bag through bolt, and the middle part of second support (5) is fixedly connected with electric drive axle housing (2) and intermediate support through bolt. The utility model relates to equalizing beam (7) and a plurality of first bearing air bags (6), equalizing beam (7) is fixedly connected with electric drive axle housing (2), a plurality of first bearing air bags (6) are evenly distributed in the rear drive axle of vehicle, and a plurality of first bearing air bags (6) are connected in parallel through first pipeline (8), at least one first bearing air bag (6) is connected with first pressure sensor, the cover of the upper end of bearing air bag is fixedly connected with frame (1), and the piston of the lower end of bearing air bag is fixedly connected with equalizing beam (7), and bearing air bag is used for bearing the vertical load of vehicle. The utility model relates to a first support (4) is L-shaped, including first fixed plate and second fixed plate, the first fixed plate is connected with the inside of frame (1), and the second fixed plate is connected with the bottom plate of lifting air bag. Two lifting air bags are connected in parallel through second pipeline (9), and at least one lifting air bag is connected with second pressure sensor. ​ 2. The liftable electric drive axle air suspension system of claim 1, wherein, ​ 3. The liftable electric drive axle air suspension system of claim 1, wherein, ​ 4. The liftable electric drive axle air suspension system of claim 1, wherein, ​ 5. The liftable electric drive axle air suspension system of claim 1, wherein, The outer side of the frame (1) is provided with a limiting structure (12), and the top of the electric drive axle housing (2) is provided with a pressing plate (13) corresponding to the limiting structure (12).

6. A vehicle characterized by comprising: Comprise: The middle axle and the rear axle are provided with the liftable electric drive axle air suspension system according to any one of claims 1-5.

7. The vehicle of claim 6, wherein The middle axle is uniformly provided with a plurality of second bearing air bags (10), and the plurality of second bearing air bags (10) are connected in parallel through a third pipeline (11), and at least one second bearing air bag (10) is connected with a third pressure sensor.

8. The vehicle of claim 7, wherein, Further comprising a solenoid valve (14), an air inlet (22) of the solenoid valve (14) is connected with an air reservoir, and three working ports of the solenoid valve (14) are respectively connected with the third pipeline (11), the first pipeline (8) and the second pipeline (9) of the liftable electric drive axle air suspension system.

Images