Semitrailer electric drive axle air suspension system with low suspension height and assembly method

Abstract

The invention relates to a semi-trailer electric drive axle air suspension system with a low suspension height and an assembling method.The semi-trailer electric drive axle air suspension system comprises a central integrated electric drive axle, a suspension assembly and a frame assembly, the central integrated electric drive axle comprises a power system and an electric drive axle shell, and the two ends of the electric drive axle shell are connected with the suspension assembly; the top of the suspension assembly is connected with the frame assembly, the frame assembly is located above the suspension assembly and the electric drive axle housing, the frame assembly is used for being connected with the semitrailer, the electric drive axle housing comprises a mounting part used for mounting a power system and two connecting parts symmetrically arranged at the two ends of the mounting part, and fixing parts are arranged between the connecting parts and the mounting part. The suspension assembly comprises two suspension assemblies which are symmetrically arranged, the two suspension assemblies are connected with the two fixing parts through connecting assemblies respectively, and the electric drive axle housing is of an integrated structure. According to the air suspension system of the electric drive axle, the space utilization rate is greatly increased, the dynamic performance is optimized, and the light weight requirement is met.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy trucks, and in particular to an air suspension system for an electric drive axle of a semitrailer with a low suspension height and an assembly method thereof. Background Art

[0002] With the increasing national energy conservation and emission reduction requirements, new energy commercial vehicles have developed rapidly. It is expected that in the next 5-10 years, more than 30% of commercial vehicles will adopt electric drive configuration. At present, the application of new energy buses in electrification is relatively extensive, while in the field of trucks, the electrification process is still mainly "oil to electricity", and the power battery is usually arranged behind the cab. Limited by the vehicle space layout, this design leads to a relatively limited cruising range, which is difficult to meet the needs of long-distance transportation and efficient logistics.

[0003] In terms of electric drive technology, the current typical electric drive axle structures mainly include central integrated drive axles and wheel-side electric drive axles. Among them, the central integrated drive axle has become the mainstream choice in the current market due to its compact structure and high transmission efficiency, and has been widely used in tractors. However, in the field of semi-trailers, especially in urban logistics trucks, the application of electric drive axles is still relatively small. This is mainly limited by the low flatbed height and complex working conditions of semi-trailers, resulting in great challenges in the spatial layout of the electric drive axle and suspension system.

[0004] On the one hand, urban environmental governance has put forward an urgent demand for the electrification of logistics trucks to reduce exhaust emissions and noise pollution; on the other hand, the low-profile design of logistics trucks combined with the power system of the electric drive axle further compresses the layout space of the suspension system. Due to its large size and high weight, the traditional leaf spring suspension is difficult to meet the requirements of electric logistics vehicles for lightweight and space optimization. Therefore, air suspension, as a lightweight, compact and adjustable suspension form, has become a key technical direction to solve this problem.

[0005] However, the existing air suspension system still faces difficulties such as space limitations, lightweight requirements, dynamic performance optimization, and cost control when applied to electric drive axle semi-trailers. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide an electric drive axle air suspension system for a semi-trailer with a low suspension height, which not only greatly improves the space utilization rate, but also optimizes the dynamic performance and saves the operation cost.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a semi-trailer electric drive axle air suspension system with a low suspension height, including a central integrated electric drive axle, a suspension assembly and a frame assembly, the central integrated electric drive axle includes a power system and an electric drive axle bridge housing, the two ends of the electric drive axle bridge housing are connected to the suspension assembly, the top of the suspension assembly is connected to the frame assembly, the frame assembly is located above the suspension assembly and the electric drive axle bridge housing, the frame assembly is used to connect to the semi-trailer, the electric drive axle bridge housing includes a mounting portion for installing the power system and two connecting portions symmetrically arranged at both ends of the mounting portion, a fixing portion is arranged between the connecting portion and the mounting portion, the suspension assembly includes two symmetrically arranged suspension assemblies, the two suspension assemblies are respectively connected to the two fixing portions through a connecting assembly, and the electric drive axle bridge housing is an integrated structure.

[0008] In one of the embodiments, a thrust assembly is arranged between the electric drive axle housing and the frame assembly of the electric drive axle air suspension system of the semi-trailer with low suspension height, and the thrust assembly includes a thrust rod, a first mounting seat and a second mounting seat, the first mounting seat is installed on the top of the electric drive axle housing, and the second mounting seat is installed on the side end of the inner wall of the frame assembly, one end of the thrust rod is hinged to the first mounting seat, and the other end of the thrust rod is hinged to the second mounting seat.

[0009] In one embodiment, the mounting portion of the air suspension system of the electric drive axle of a semi-trailer with a low suspension height includes a first mounting plate and a second mounting plate, two ends of the first mounting plate are respectively connected to two ends of the second mounting plate, the first mounting plate is located above the second mounting plate, and an installation space for installing the power system is formed between the first mounting plate and the second mounting plate.

[0010] In one embodiment, the fixing part of the air suspension system of the electric drive axle of the semi-trailer with low suspension height includes a first fixing plate and a second fixing plate, the first fixing plate and the second fixing plate are connected by two symmetrically arranged connecting plates, the second fixing plate is located below the first fixing plate, and the connecting part includes an annular fixing plate and a connecting head, and the annular fixing plate is sleeved on one end of the connecting head close to the fixing part.

[0011] In one of the embodiments, the suspension assembly of the electric drive axle air suspension system of the semi-trailer with low suspension height includes a guide arm assembly, a bracket and an air spring. One end of the guide arm assembly is connected to the bracket through a wheelbase adjustment mechanism, and the other end of the guide arm assembly is connected to the air spring. The connecting assembly includes an upper pressure plate, a lower pressure plate and a first fastener. The upper pressure plate and the lower pressure plate are respectively covered on the top and bottom ends of the middle part of the guide arm assembly. The first fastener is used to sequentially pass through the lower pressure plate, the upper pressure plate and the fixing part of the electric drive axle housing to lock the electric drive axle housing and the guide arm assembly together. A shock absorber is arranged between the upper pressure plate and the frame assembly.

[0012] In one of the embodiments, the upper pressure plate of the air suspension system of the electric drive axle of the semi-trailer with low suspension height is provided with a first positioning pin for positioning and cooperating with the fixing part, and the guide arm assembly is provided with a second positioning pin for positioning and cooperating with the upper pressure plate, and the guide arm assembly is covered with a wear-resistant plate, the top end of the wear-resistant plate is located between the upper pressure plate and the guide arm assembly, and the bottom end of the wear-resistant plate is located between the lower pressure plate and the guide arm assembly.

[0013] In one of the embodiments, the frame assembly of the air suspension system of the electric drive axle of the semi-trailer with low suspension height includes two symmetrically arranged longitudinal beams, two first channel steels and two cross beams are symmetrically arranged between the two longitudinal beams, the two longitudinal beams are respectively welded to the brackets of the two suspension components and the top of the air spring, a second channel steel is arranged between the two brackets, the second channel steel is connected to the first channel steel by two first reinforcing ribs, and the side ends of the first reinforcing ribs are welded to the brackets and the longitudinal beams.

[0014] In one of the embodiments, a plurality of second reinforcing ribs are arranged on the outer wall of the longitudinal beam of the air suspension system of the electric drive axle of the semi-trailer with low suspension height, a removable first pad is arranged at one end of the longitudinal beam close to the bracket, the first pad is connected to the bracket, and a second pad is arranged on the inner wall of the longitudinal beam, and the second pad is used to strengthen the rigidity of the longitudinal beam.

[0015] In one of the embodiments, a thrust assembly is arranged between the electric drive axle housing and the frame assembly of the electric drive axle air suspension system of the semi-trailer with low suspension height, and the thrust assembly includes a thrust rod, a first mounting seat and a second mounting seat, the first mounting seat is installed on the top of the electric drive axle housing, and the second mounting seat is installed on the side end of the inner wall of the frame assembly, one end of the thrust rod is hinged to the first mounting seat, and the other end of the thrust rod is hinged to the second mounting seat.

[0016] In one of the embodiments, the electric drive axle air suspension system for a semi-trailer with a low suspension height also includes two tire assemblies, and the two connecting parts of the electric drive axle bridge housing are respectively connected to the two tire assemblies through wheel end assemblies, and the wheel end assembly includes a brake base plate, a brake caliper, a brake disc, a wheel hub, a connecting disc, a wheel bolt, a brake air chamber and a second fastener.

[0017] In one of the embodiments, the tire assembly of the electric drive axle air suspension system of the semi-trailer with low suspension height includes a tire and a rim, the tire is mounted on the rim, and the connection between the rim and the electric drive axle housing is connected through a wheel end assembly.

[0018] A method for assembling an air suspension system for an electric drive axle of a semitrailer with a low suspension height is provided, and the method is used to assemble the air suspension system for an electric drive axle of a semitrailer with a low suspension height, and the steps are as follows:

[0019] Step 1: Install the power system on the mounting part of the electric drive axle housing. The two connecting parts of the electric drive axle housing are respectively connected to the two tire assemblies through the wheel end assembly, and then the power system is connected to the wheel end assembly;

[0020] Step 2: The two suspension components are respectively connected to the two fixing parts of the electric drive axle housing through the connecting components;

[0021] Step 3: The top of the frame assembly is connected to the bottom of the trailer body, the bottom of the frame assembly is welded to the brackets and air springs of the two suspension assemblies, and the two longitudinal beams of the frame assembly and the upper pressure plates of the two suspension assemblies are connected through shock absorbers;

[0022] Step 4: One end of the thrust rod is connected to the top of the electric drive axle housing through a first mounting seat, and the other end of the thrust rod is connected to the inner wall of the frame assembly through a second mounting seat.

[0023] The beneficial effects of this application are:

[0024] The present application provides a low suspension height semi-trailer electric drive axle air suspension system, which realizes the application of the central integrated electric drive axle of the semi-trailer by setting up a central integrated electric drive axle, a suspension assembly, a frame assembly and a tire assembly to cooperate with each other, so that the layout space of the power system is greatly expanded, meeting the long-range requirements, and also improving the dynamic performance of the semi-trailer and reducing the operating cost. After verification, the layout space of the low suspension height semi-trailer electric drive axle air suspension system is increased by at least 35% compared with the traditional semi-trailer air suspension.

[0025] The low suspension height semi-trailer electric drive axle air suspension system adopts an integrated electric drive axle housing to install, fix and connect the power system, suspension assembly and tire assembly respectively, achieving a significant expansion of the layout space and meeting the application requirements of the vehicle.

[0026] The low suspension height semi-trailer electric drive axle air suspension system uses a thrust component to rigidly connect the electric drive axle housing and the frame assembly, reducing the vibration and displacement of the central integrated electric drive axle and improving the stability of the vehicle during driving. Especially when driving at high speed or accelerating or braking suddenly, the thrust component can effectively suppress the swing of the central integrated electric drive axle and improve the handling. The thrust component is used in conjunction with the suspension assembly, the central integrated electric drive axle and the frame assembly. After CAE verification, the roll angle stiffness of the suspension system can reach more than 50,000 Nm / °, while the roll angle stiffness of the traditional semi-trailer air suspension is about 20,000 Nm / °, which significantly improves the lateral stability of the suspension. Moreover, the lateral movement of the axle under the action of lateral force is reduced by more than 50% compared with the traditional semi-trailer air suspension, which is conducive to smooth driving and reducing the wear of the tire assembly.

[0027] The low suspension height semi-trailer electric drive axle air suspension system adopts the suspension assembly to achieve a low suspension height design, which lowers the overall center of gravity of the vehicle. The low center of gravity design improves the driving stability and anti-roll capability of the vehicle, which is particularly suitable for high-speed and curved driving, and reduces the space occupied by the bottom of the vehicle, providing more layout space for the power system.

[0028] The low suspension height semi-trailer electric drive axle air suspension system adopts a frame assembly that not only bears the body, but also plays a role in installing and fixing the suspension assembly and the central integrated electric drive axle. When the central integrated electric drive axle outputs driving force to the tire assembly, it bears the reaction force during braking and steering to ensure the rigidity of the body. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of an air suspension system for an electric drive axle of a semitrailer with a low suspension height according to an embodiment of the present application;

[0030] Figure 2 A schematic diagram of a central integrated electric drive axle and a tire assembly of an electric drive axle air suspension system for a semi-trailer with a low suspension height according to an embodiment of the present application;

[0031] Figure 3 A schematic diagram of an electric drive axle housing of an electric drive axle air suspension system for a semitrailer with a low suspension height according to an embodiment of the present application;

[0032] Figure 4 A schematic diagram of an electric drive axle housing, a suspension assembly and a frame assembly of an electric drive axle air suspension system for a semi-trailer with a low suspension height according to an embodiment of the present application from one perspective;

[0033] Figure 5 A schematic diagram of an electric drive axle housing, a suspension assembly and a frame assembly of an electric drive axle air suspension system for a semi-trailer with a low suspension height according to an embodiment of the present application from another perspective;

[0034] Figure 6 A schematic diagram of a suspension assembly of an air suspension system for an electric drive axle of a semitrailer with a low suspension height according to an embodiment of the present application;

[0035] Figure 7 A cross-sectional view of a suspension assembly and an electric drive axle housing of an air suspension system for an electric drive axle of a semitrailer with a low suspension height according to an embodiment of the present application;

[0036] Figure 8 A top view of a suspension assembly and an electric drive axle housing of an air suspension system for an electric drive axle of a semitrailer with a low suspension height according to an embodiment of the present application;

[0037] in:

[0038] 1. Central integrated electric drive axle; 2. Suspension assembly; 3. Frame assembly; 4. Tire assembly; 11. Power system; 12. Electric drive axle housing; 13. Thrust assembly; 121. Mounting part; 122. Connecting part; 123. Fixing part; 131. Thrust rod; 132. First mounting seat; 133. Second mounting seat; 001. First mounting plate; 002. Second mounting plate; 003. First fixing plate; 004. Second fixing plate; 005. Connecting plate; 006. Annular fixing plate; 007. Connector; 21. Suspension assembly 1. Part; 22. Connecting assembly; 211. Guide arm assembly; 212. Bracket; 213. Air spring; 221. Upper pressure plate; 225. Lower pressure plate; 222. First fastener; 223. Shock absorber; 224. Wear plate; 008. First locating pin; 009. Second locating pin; 31. Longitudinal beam; 32. First channel steel; 33. Cross beam; 34. Second channel steel; 35. First reinforcing rib; 36. Second reinforcing rib; 37. First pad; 38. Second pad; 41. Wheel end assembly; 42. Tire; 43. Rim. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0040] like Figure 1-Figure 3 As shown, an embodiment of the present application provides an air suspension system for an electric drive axle of a semi-trailer with a low suspension height, comprising a central integrated electric drive axle 1, a suspension assembly 2 and a frame assembly 3, wherein the central integrated electric drive axle 1 comprises a power system 11 and an electric drive axle housing 12, wherein both ends of the electric drive axle housing 12 are connected to the suspension assembly 2, and the top of the suspension assembly 2 is connected to the frame assembly 3, and the frame assembly 3 is located above the suspension assembly 2 and the electric drive axle housing 12, and the frame assembly 3 is used to be connected to the semi-trailer, and the electric drive axle housing 12 comprises a mounting portion 121 for mounting the power system 11 and two connecting portions 122 symmetrically arranged at both ends of the mounting portion 121, and a fixing portion 123 is arranged between the connecting portion 122 and the mounting portion 121, and the suspension assembly 2 comprises two symmetrically arranged suspension components 21, and the two suspension components 21 are respectively connected to the two fixing portions 123 through a connecting component 22, and the electric drive axle housing 12 is an integrated structure.

[0041] Specifically, the power system 11 is installed on the mounting portion 121 of the electric drive axle housing 12, the two connecting portions 122 of the electric drive axle housing 12 are respectively connected to the two tire assemblies 4 through the wheel end assembly 41, the power system 11 is connected to the wheel end assembly 41, and the power system 11 drives the wheel end assembly 41 to drive the two tire assemblies 4 to rotate. The two suspension assemblies 21 are respectively connected to the two fixing portions 123 of the electric drive axle housing 12 through the connecting assembly 22, and the connecting assembly 22 locks and fixes the electric drive axle housing 12 and the two suspension assemblies 21 together. The top of the frame assembly 3 is connected to the bottom of the trailer body, the bottom of the frame assembly 3 is welded to the bracket 212 and the air spring 213 of the two suspension assemblies 21, and the two longitudinal beams 31 of the frame assembly 3 and the upper pressure plates 221 of the two suspension assemblies 21 are connected through the shock absorber 223. The mounting portion 121, two fixing portions 123 and two connecting portions 122 of the electric drive axle housing 12 are made by an integrated casting process. The power system 11 mainly comprises a drive motor and a transmission.

[0042] In the above structure, the power system 11 is installed by using the mounting portion 121 of the electric drive axle housing 12, the two fixing portions 123 are respectively locked and connected with the two suspension assemblies 21 through the first fasteners 222, and the two connecting portions 122 are respectively connected with the two tire assemblies 4. The setting of the mounting portion 121 not only expands the installation space of the power system 11, but also facilitates the installation of the thrust assembly 13. The setting of the fixing portion 123 and the connecting portion 122 facilitates the connection with the suspension assembly 2 and the tire assembly 4, which greatly saves the occupied space. The use of the one-piece cast electric drive axle housing 12 not only strengthens the structural strength, but also improves the lightweight of the system. By setting the synergistic effect of the central integrated electric drive axle 1, the suspension assembly 2 and the frame assembly 3, not only the central integrated electric drive axle 1 is applied to the semi-trailer with low suspension height, meeting the low flatbed height requirement of ordinary logistics vehicles, but also the layout space of the power system 11 is greatly expanded, meeting the long endurance requirement, and realizing the efficient operation, lightweight design and dynamic performance optimization of the semi-trailer. After verification, the low suspension height semi-trailer electric drive axle air suspension system is improved by at least 35% compared with the traditional semi-trailer air suspension.

[0043] like Figure 4As shown, in one embodiment, a thrust assembly 13 is provided between the electric drive axle housing 12 and the frame assembly 3 of the electric drive axle air suspension system of the semi-trailer with low suspension height, and the thrust assembly 13 includes a thrust rod 131, a first mounting seat 132 and a second mounting seat 133. The first mounting seat 132 is mounted on the top of the electric drive axle housing 12, and the second mounting seat 133 is mounted on the side end of the inner wall of the frame assembly 3. One end of the thrust rod 131 is hinged to the first mounting seat 132, and the other end of the thrust rod 131 is hinged to the second mounting seat 133. The first mounting seat 132 is mounted on the first mounting plate 001 of the electric drive axle housing 12, and the second mounting seat 133 is mounted on the inner wall of a longitudinal beam 31 of the frame assembly 3. One end of the thrust rod 131 is hinged to the first mounting seat 132, and the other end of the thrust rod 131 is hinged to the second mounting seat 133. The thrust rod 131 is rigidly connected to the electric drive axle housing 12 and the frame assembly 3, reducing the vibration and displacement of the central integrated electric drive axle 1, and improving the stability of the vehicle during driving. Especially when driving at high speed or accelerating or braking suddenly, the thrust assembly can effectively suppress the swing of the central integrated electric drive axle 1 and improve the handling. The thrust rod 131 is used in conjunction with the suspension assembly 2, the central integrated electric drive axle 1 and the frame assembly 3. After CAE verification, the roll angle stiffness of the suspension system can reach more than 50000Nm / °, while the roll angle stiffness of the traditional semi-trailer air suspension is about 20000Nm / °, which significantly improves the lateral stability of the suspension. And the lateral movement of the axle under the action of lateral force is reduced by more than 50% compared with the traditional semi-trailer air suspension, which is conducive to smooth driving and reducing the wear of the tire assembly 4.

[0044] like Figure 3 As shown, in one embodiment, the installation part 121 of the air suspension system of the electric drive bridge of the semi-trailer with low suspension height includes a first installation plate 001 and a second installation plate 002, the two ends of the first installation plate 001 are respectively connected to the two ends of the second installation plate 002, the first installation plate 001 is located above the second installation plate 002, and an installation space for installing the power system 11 is formed between the first installation plate 001 and the second installation plate 002. The first installation plate 001 and the second installation plate 002 form a vertically arranged installation space, which not only occupies a small space, but also facilitates the installation of the power system 11, thereby improving the space utilization of the power system 11 and meeting the long-range requirements.

[0045] like Figure 3As shown, in one embodiment, the fixing part 123 of the air suspension system of the electric drive bridge of the semi-trailer with low suspension height includes a first fixing plate 003 and a second fixing plate 004, the first fixing plate 003 and the second fixing plate 004 are connected by two symmetrically arranged connecting plates 005, the second fixing plate 004 is located below the first fixing plate 003, and the connecting part 122 includes an annular fixing plate 006 and a connecting head 007, and the annular fixing plate 006 is sleeved on one end of the connecting head 007 close to the fixing part 123. The horizontally arranged first fixing plate 003 and the horizontally arranged second fixing plate 004 are connected by two vertically arranged connecting plates 005 to form an I-shaped fixing part 123. The fixing part 123 is arranged to facilitate the connecting assembly 22 to securely lock the guide arm assembly 211 of the suspension assembly 21 with the fixing part 123. The connecting head 007 is connected to the tire assembly 4 through the wheel end assembly 41, and the wheel end assembly 41 is locked with the annular fixing plate 006 through a bolt assembly. The connection portion 122 is provided to facilitate connection with the tire assembly 4 , so that the power system 11 can provide power support to the wheel end assembly 41 and the tire assembly 4 .

[0046] like Figure 5 and Figure 6 As shown, in one embodiment, the suspension assembly 21 of the air suspension system of the electric drive axle of the semi-trailer with low suspension height includes a guide arm assembly 211, a bracket 212 and an air spring 213. One end of the guide arm assembly 211 is connected to the bracket 212 through a wheelbase adjustment mechanism, and the other end of the guide arm assembly 211 is connected to the air spring 213. The connecting assembly 22 includes an upper pressing plate 221, a lower pressing plate 225 and a first fastener 222. The upper pressing plate 221 and the lower pressing plate 225 are respectively covered at the top and bottom of the middle part of the guide arm assembly 211. The first fastener 222 is used to pass through the lower pressing plate 225, the upper pressing plate 221 and the fixing part 123 of the electric drive axle housing 12 in sequence to lock the electric drive axle housing 12 and the guide arm assembly 211 together. A shock absorber 223 is provided between the upper pressing plate 221 and the frame assembly 3. The first fastener 222 includes four bolts and four self-locking nuts. The upper pressure plate 221 and the lower pressure plate 225 are wrapped around the middle part of the guide arm assembly 211, and then the guide arm assembly 211 is pressed against the second fixing plate 004 of the electric drive axle housing 12. Four bolts are passed through the lower pressure plate 225, the upper pressure plate 221, the second fixing plate 004 and the first fixing plate 003 in sequence, and then locked with four self-locking nuts, so that the guide arm assembly 211 and the electric drive axle housing 12 are firmly locked together. This setting facilitates locking the two suspension components 21 and the two fixing parts 123 of the electric drive axle housing 12 together, so that the layout space of the power system 11 between the two suspension components 21 and the electric drive axle housing 12 is greatly expanded, meeting the long-range requirements of new energy trucks.

[0047] like Figure 7 As shown, in one embodiment, the upper pressure plate 221 of the air suspension system of the electric drive axle of the semi-trailer with low suspension height is provided with a first positioning pin 008 for positioning and cooperating with the fixing part 123, and the guide arm assembly 211 is provided with a second positioning pin 009 for positioning and cooperating with the upper pressure plate 221, and the guide arm assembly 211 is covered with a wear-resistant plate 224, the top end of the wear-resistant plate 224 is located between the upper pressure plate 221 and the guide arm assembly 211, and the bottom end of the wear-resistant plate 224 is located between the lower pressure plate 225 and the guide arm assembly 211. When the upper pressure plate 221 is covered on the guide arm assembly 211, the second positioning pin 009 of the guide arm assembly 211 passes through the wear-resistant plate 224 and extends into the positioning hole of the upper pressure plate 221 to position the upper pressure plate 221. When the guide arm assembly 211 drives the upper pressure plate 221 to abut against the second fixing plate 004 of the fixing part 123, the first positioning pin 008 of the upper pressure plate 221 extends into the positioning hole of the second fixing plate 004 to position the second fixing plate 004. The provision of the first positioning pin 008 and the second positioning pin 009 improves the positioning effect of the guide arm assembly 211 and the electric drive axle housing 12. The wear-resistant plate 224 covers the upper and lower ends of the middle part of the guide arm assembly 211. The provision of the wear-resistant plate 224 is convenient for increasing the friction between the guide arm assembly 211 and the upper pressure plate 221 and the lower pressure plate 225, and improving the anti-slip coefficient of the guide arm assembly 211 and the electric drive axle housing 12 when road conditions occur.

[0048] like Figure 4 and Figure 5 As shown, in one embodiment, the frame assembly 3 of the air suspension system of the electric drive bridge of the semi-trailer with low suspension height includes two symmetrically arranged longitudinal beams 31, two first channel steels 32 and two cross beams 33 are symmetrically arranged between the two longitudinal beams 31, and the two longitudinal beams 31 are respectively welded to the top of the brackets 212 and the air springs 213 of the two suspension components 21, and a second channel steel 34 is arranged between the two brackets 212, and the second channel steel 34 is connected to the first channel steel 32 through two first reinforcing ribs 35, and the side ends of the first reinforcing ribs 35 are welded to the brackets 212 and the longitudinal beams 31. The longitudinal beams 31 are welded to the brackets 212 and the top of the air springs 213 of the suspension components 21, which strengthens the connection strength between the longitudinal beams 31 and the suspension components 21. A shock absorber 223 connection seat is also provided on the longitudinal beam 31, and a shock absorber 223 support plate is provided on the upper pressure plate 221. One end of the shock absorber 223 is hinged to the support plate, and the other end of the shock absorber 223 is hinged to the connection seat. The two longitudinal beams 31, the two first channel steels 32 and the two cross beams 33 are all connected by welding. The setting of the frame assembly 3 not only plays a bearing role on the vehicle body, but also plays a role in installing and fixing the suspension assembly 2 and the central integrated electric drive bridge 1. When the central integrated electric drive bridge 1 outputs the driving force to be transmitted to the tire assembly 4, it bears the reaction force during braking and steering to ensure the rigidity of the vehicle body.

[0049] like Figure 5 As shown, in one embodiment, a plurality of second reinforcing ribs 36 are arranged on the outer wall of the longitudinal beam 31 of the air suspension system of the electric drive bridge of the semi-trailer with low suspension height, and a removable first pad 37 is arranged at one end of the longitudinal beam 31 close to the bracket 212, and the first pad 37 is connected to the bracket 212, and a second pad 38 is arranged on the inner wall of the longitudinal beam 31, and the second pad 38 is used to strengthen the rigidity of the longitudinal beam 31. Two second reinforcing ribs 36 are arranged on the outer wall of the longitudinal beam 31 close to the bracket 212 to strengthen the local rigidity of the longitudinal beam 31. The first pad 37 can be used to compensate for the deviation between the center distance of the two longitudinal beams 31 and the center distance of the two suspension components 21. The second pad 38 is welded to the inner wall of the longitudinal beam 31 to facilitate strengthening the local rigidity of the longitudinal beam 31.

[0050] like Figure 2 As shown, in one embodiment, the electric drive axle air suspension system for a semitrailer with a low suspension height further includes two tire assemblies 4, and the two connecting parts 122 of the electric drive axle housing 12 are respectively connected to two tires 42 through a wheel end assembly 41, and the wheel end assembly 41 includes a brake base plate, a brake caliper, a brake disc, a wheel hub, a connecting disc, a wheel bolt, a brake air chamber, and a second fastener. This arrangement facilitates the power system 11 to drive the tire 42 through the wheel end assembly 41 to provide power to the tire assembly 4.

[0051] like Figure 2 As shown, in one embodiment, the tire assembly 4 of the low suspension height semi-trailer electric drive axle air suspension system includes a tire 42 and a rim 43, the tire 42 is mounted on the rim 43, and the rim 43 is connected to the connecting portion 122 of the electric drive axle housing 12 through the wheel end assembly 41. The tire 42 can be a single tire 425 / 65R22.5. This arrangement facilitates the coordinated action with the central integrated electric drive axle 1, the suspension assembly 2 and the frame assembly 3 to drive the semi-trailer.

[0052] like Figure 7 and Figure 8 As shown, the specific example:

[0053] The guide arm assembly 211 includes a guide arm front section and a guide arm rear section. The lever arm of the guide arm front section and the guide arm rear section is 500:380, the height from the axis of the tire assembly 4 to the lower wing surface of the frame is 280mm, the upward jump stroke is 90mm, the downward jump stroke is 90mm, the center distance L of the two guide arm assemblies 211 is 1018mm, the center distance M of the two air springs 213 is 898mm, the spacing N between the mounting surfaces of the two rims 43 is 1836mm, and the center distance of the two longitudinal beams 31 is 920mm. This setting can increase the battery loading capacity of the power system 11 by more than 500kWh, and the wheel side peak torque of the central integrated electric drive bridge 1 can reach 35000Nm, which not only realizes the application of the central integrated drive bridge of the semi-trailer, but also greatly meets the long-range requirements of the semi-trailer.

[0054] The embodiment of the present application also provides a method for assembling an air suspension system for an electric drive axle of a semi-trailer with a low suspension height, which is used to assemble the air suspension system for an electric drive axle of a semi-trailer with a low suspension height, and the steps are as follows:

[0055] Step 1: Install the power system 11 on the mounting portion 121 of the electric drive axle housing 12, the two connecting portions 122 of the electric drive axle housing 12 are respectively connected to the two tire assemblies 4 through the wheel end assemblies 41, and then connect the power system 11 to the wheel end assemblies 41;

[0056] Step 2: The two suspension components 21 are respectively connected to the two fixing parts 123 of the electric drive axle housing 12 through the connecting components 22;

[0057] Step 3: The top of the frame assembly 3 is connected to the bottom of the trailer body, the bottom of the frame assembly 3 is welded to the brackets 212 and air springs 213 of the two suspension assemblies 21, and the two longitudinal beams 31 of the frame assembly 3 and the upper pressure plates 221 of the two suspension assemblies 21 are connected through the shock absorber 223;

[0058] Step 4: One end of the thrust rod 131 is connected to the top of the electric drive axle housing 12 through the first mounting seat 132 , and the other end of the thrust rod 131 is connected to the inner wall of the frame assembly 3 through the second mounting seat 133 .

[0059] The assembly method of the electric drive axle air suspension system for a semitrailer with a low suspension height not only simplifies the assembly process, but also improves the stability, controllability, comfort and safety of the semitrailer.

[0060] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A semi-trailer electric drive axle air suspension system with low suspension height, characterized in that: The invention comprises a central integrated electric drive axle (1), a suspension assembly (2) and a frame assembly (3), wherein the central integrated electric drive axle (1) comprises a power system (11) and an electric drive axle housing (12), wherein both ends of the electric drive axle housing (12) are connected to the suspension assembly (2), and the top of the suspension assembly (2) is connected to the frame assembly (3), and the frame assembly (3) is located above the suspension assembly (2) and the electric drive axle housing (12), and the frame assembly (3) is used to be connected to a semitrailer, and the electric drive axle housing (12) is connected to the semitrailer. ) comprises a mounting portion (121) for mounting a power system (11) and two connecting portions (122) symmetrically arranged at both ends of the mounting portion (121), a fixing portion (123) being arranged between the connecting portion (122) and the mounting portion (121), the suspension assembly (2) comprising two symmetrically arranged suspension components (21), the two suspension components (21) being respectively connected to the two fixing portions (123) via connecting components (22), and the electric drive axle housing (12) being an integrated structure.

2. The low suspension height semi-trailer electric drive axle air suspension system according to claim 1, characterized in that: A thrust assembly (13) is arranged between the electric drive axle housing (12) and the frame assembly (3), and the thrust assembly (13) comprises a thrust rod (131), a first mounting seat (132) and a second mounting seat (133), wherein the first mounting seat (132) is mounted on the top of the electric drive axle housing (12), and the second mounting seat (133) is mounted on the side end of the inner wall of the frame assembly (3), one end of the thrust rod (131) is hinged to the first mounting seat (132), and the other end of the thrust rod (131) is hinged to the second mounting seat (133).

3. The low suspension height semi-trailer electric drive axle air suspension system according to claim 1, characterized in that: The mounting portion (121) comprises a first mounting plate (001) and a second mounting plate (002), the two ends of the first mounting plate (001) being respectively connected to the two ends of the second mounting plate (002), the first mounting plate (001) being located above the second mounting plate (002), and an installation space for installing the power system (11) being formed between the first mounting plate (001) and the second mounting plate (002).

4. The low suspension height semi-trailer electric drive axle air suspension system according to claim 1, characterized in that: The fixing portion (123) comprises a first fixing plate (003) and a second fixing plate (004), the first fixing plate (003) and the second fixing plate (004) being connected via two symmetrically arranged connecting plates (005), the second fixing plate (004) being located below the first fixing plate (003), and the connecting portion (122) comprising an annular fixing plate (006) and a connecting head (007), the annular fixing plate (006) being sleeved on one end of the connecting head (007) close to the fixing portion (123).

5. The low suspension height semi-trailer electric drive axle air suspension system according to claim 1, characterized in that: The suspension assembly (21) comprises a guide arm assembly (211), a bracket (212) and an air spring (213); one end of the guide arm assembly (211) is connected to the bracket (212) via a wheelbase adjustment mechanism; the other end of the guide arm assembly (211) is connected to the air spring (213); the connection assembly (22) comprises an upper pressure plate (221), a lower pressure plate (225) and a first fastener (222); the upper pressure plate (22 1) and a lower pressure plate (225) are respectively covered on the top and bottom ends of the middle part of the guide arm assembly (211), and the first fastener (222) is used to sequentially pass through the lower pressure plate (225), the upper pressure plate (221) and the fixing part (123) of the electric drive axle housing (12) to lock the electric drive axle housing (12) and the guide arm assembly (211) together, and a shock absorber (223) is arranged between the upper pressure plate (221) and the frame assembly (3).

6. The low suspension height semi-trailer electric drive axle air suspension system according to claim 5, characterized in that: The upper pressure plate (221) is provided with a first positioning pin (008) for positioning with the fixing portion (123), the guide arm assembly (211) is provided with a second positioning pin (009) for positioning with the upper pressure plate (221), the guide arm assembly (211) is covered with a wear-resistant plate (224), the top end of the wear-resistant plate (224) is located between the upper pressure plate (221) and the guide arm assembly (211), and the bottom end of the wear-resistant plate (224) is located between the lower pressure plate (225) and the guide arm assembly (211).

7. The low suspension height semitrailer electric drive axle air suspension system according to claim 5, characterized in that: The vehicle frame assembly (3) comprises two symmetrically arranged longitudinal beams (31), two first channel steels (32) and two cross beams (33) are symmetrically arranged between the two longitudinal beams (31), the two longitudinal beams (31) are respectively welded to the tops of the brackets (212) and the air springs (213) of the two suspension components (21), a second channel steel (34) is arranged between the two brackets (212), the second channel steel (34) is connected to the first channel steel (32) via two first reinforcing ribs (35), and the side ends of the first reinforcing ribs (35) are welded to the brackets (212) and the longitudinal beams (31).

8. The low suspension height semitrailer electric drive axle air suspension system according to claim 7, characterized in that: A plurality of second reinforcing ribs (36) are arranged on the outer wall of the longitudinal beam (31); a detachable first pad (37) is arranged at one end of the longitudinal beam (31) close to the bracket (212); the first pad (37) is connected to the bracket (212); a second pad (38) is arranged on the inner wall of the longitudinal beam (31); the second pad (38) is used to strengthen the rigidity of the longitudinal beam (31).

9. The low suspension height semi-trailer electric drive axle air suspension system according to claim 1, characterized in that: The invention also comprises two tire assemblies (4), wherein the two connecting parts (122) of the electric drive axle housing (12) are respectively connected to the two tires (42) through the wheel end assembly (41), the wheel end assembly (41) comprises a brake base plate, a brake caliper, a brake disc, a wheel hub, a connecting disc, a wheel bolt, a brake air chamber and a second fastener, the tire assembly (4) comprises a tire (42) and a rim (43), the tire (42) is sleeved on the rim (43), and the rim (43) is connected to the connecting part (122) of the electric drive axle housing (12) through the wheel end assembly (41).

10. A method for assembling an electric drive axle air suspension system for a semi-trailer with a low suspension height, used for assembling the electric drive axle air suspension system for a semi-trailer with a low suspension height as claimed in any one of claims 1 to 9, characterized in that: The steps are: The first step is to install the power system (11) on the installation part (121) of the electric drive axle housing (12), and the two connecting parts (122) of the electric drive axle housing (12) are respectively connected to the two tire assemblies (4) through the wheel end assembly (41), and then the power system (11) is connected to the wheel end assembly (41); Step 2: The two suspension components (21) are respectively connected to the two fixing parts (123) of the electric drive axle housing (12) via the connecting components (22); Step 3: The top of the frame assembly (3) is connected to the bottom of the trailer body, the bottom of the frame assembly (3) is welded to the bracket (212) and the air spring (213) of the two suspension assemblies (21), and the two longitudinal beams (31) of the frame assembly (3) and the upper pressure plates (221) of the two suspension assemblies (21) are connected via the shock absorber (223); Step 4: one end of the thrust rod (131) is connected to the top of the electric drive axle housing (12) via a first mounting seat (132), and the other end of the thrust rod (131) is connected to the inner wall of the frame assembly (3) via a second mounting seat (133).

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