Low suspension height air suspension system for electric drive axle of semi-trailer and assembling method

Abstract

The application relates to a low-suspension-height electric drive axle air suspension system of a semitrailer and an assembling method, which 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 housing, the two ends of the electric drive axle housing 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 portion for mounting the power system and two symmetrical connecting portions arranged at the two ends of the mounting portion, a fixing portion is arranged between the connecting portion and the mounting portion, the suspension assembly comprises two symmetrical suspension assemblies, the two suspension assemblies are connected with the two fixing portions through connecting assemblies, and the electric drive axle housing is of an integrated structure. The electric drive axle air suspension system not only greatly improves the space utilization rate, but also optimizes the dynamic performance and improves the lightweight demand.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy truck, in particular to a low-suspension-height electric drive axle air suspension system for a semitrailer and an assembling method thereof. BACKGROUND

[0002] With the increasingly upgrading of the national energy-saving and emission-reduction requirements, new energy commercial vehicles have developed rapidly. It is predicted that more than 30% of commercial vehicles will adopt electric drive configuration in the next 5-10 years. At present, new energy buses are relatively widely used in electric vehicles, while in the field of trucks, the electric vehicle process is still mainly based on "oil to electricity", and the power battery is usually arranged behind the cab. Limited by the space layout of the vehicle, this design leads to limited endurance mileage, which is difficult to meet the needs of long-distance transportation and efficient logistics.

[0003] In terms of electric drive technology, the typical electric drive axle structure currently mainly includes a central integrated drive axle and a wheel-side electric drive axle. 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 semitrailers, especially in urban logistics trucks, the application of electric drive axle is still relatively small. This is mainly limited by the low flat height of the semitrailer and the complex working condition requirements, which leads to a greater challenge in the space layout of the electric drive axle and the suspension system.

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

[0005] However, the existing air suspension system still has difficulties in space limitation, lightweight demand, dynamic performance optimization, cost control, etc. when applied to electric drive axle semitrailers. SUMMARY

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

[0007] The technical scheme adopted by the present application to solve its technical problems is: a low-suspension-height electric drive axle air suspension system of a semitrailer, comprising a central integrated electric drive axle, a suspension assembly and a frame assembly, the central integrated electric drive axle comprising a power system and an electric drive axle housing, two ends of the electric drive axle housing being connected with the suspension assembly, a top of the suspension assembly being connected with the frame assembly, the frame assembly being located above the suspension assembly and the electric drive axle housing, the frame assembly being used for connecting with the semitrailer, the electric drive axle housing comprising a mounting portion for mounting the power system and two connecting portions symmetrically arranged at two ends of the mounting portion, a fixing portion being arranged between the connecting portions and the mounting portion, the suspension assembly comprising two suspension assemblies symmetrically arranged, the two suspension assemblies being connected with the two fixing portions through connecting assemblies respectively, and the electric drive axle housing being of an integral structure.

[0008] In one of the embodiments, a thrust assembly is arranged between the electric drive axle housing and the frame assembly of the low-suspension-height electric drive axle air suspension system of the semitrailer, the thrust assembly comprising a thrust rod, a first mounting seat and a second mounting seat, the first mounting seat being mounted at a top of the electric drive axle housing, the second mounting seat being mounted at an inner wall side end of the frame assembly, one end of the thrust rod being hinged with the first mounting seat, and the other end of the thrust rod being hinged with the second mounting seat.

[0009] In one of the embodiments, the mounting portion of the low-suspension-height electric drive axle air suspension system of the semitrailer comprises a first mounting plate and a second mounting plate, two ends of the first mounting plate being connected with two ends of the second mounting plate respectively, the first mounting plate being located above the second mounting plate, and an installation space for mounting the power system being formed between the first mounting plate and the second mounting plate.

[0010] In one of the embodiments, the fixing portion of the low-suspension-height electric drive axle air suspension system of the semitrailer comprises a first fixing plate and a second fixing plate, the first fixing plate and the second fixing plate being connected through two symmetrically arranged connecting plates, the second fixing plate being located below the first fixing plate, the connecting portion comprising a ring-shaped fixing plate and a connecting head, and the ring-shaped fixing plate being sleeved at one end of the connecting head close to the fixing portion.

[0011] In one of the embodiments, the suspension assembly of the low-suspension-height electric drive axle air suspension system of the semitrailer comprises a guide arm assembly, a bracket and an air spring, one end of the guide arm assembly being connected with the bracket through a wheelbase adjustment mechanism, the other end of the guide arm assembly being connected with the air spring, the connecting assembly comprising an upper pressing plate, a lower pressing plate and a first fastener, the upper pressing plate and the lower pressing plate being respectively wrapped at a top end and a bottom end of an intermediate portion of the guide arm assembly, and the first fastener being used for sequentially penetrating through the lower pressing plate, the upper pressing plate and the fixing portion of the electric drive axle housing to lock the electric drive axle housing and the guide arm assembly together, and a shock absorber being arranged between the upper pressing plate and the frame assembly.

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

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

[0014] In one of the embodiments, the outer wall of the longitudinal beam of the low-suspension-height electric drive axle air suspension system of the semi-trailer is provided with a plurality of second reinforcing ribs, one end of the longitudinal beam close to the bracket is provided with a detachable first pad plate connected to the bracket, and the inner wall of the longitudinal beam is provided with a second pad plate for reinforcing the rigidity of the longitudinal beam.

[0015] In one of the embodiments, the low-suspension-height electric drive axle air suspension system of the semi-trailer further comprises a thrust assembly arranged between the electric drive axle housing and the frame assembly, the thrust assembly comprises a thrust rod, a first mounting seat and a second mounting seat, the first mounting seat is mounted on the top of the electric drive axle housing, the second mounting seat is mounted on the inner wall side end 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 low-suspension-height electric drive axle air suspension system of the semi-trailer further comprises two tire assemblies, the two connecting parts of the electric drive axle housing are respectively connected to the two tire assemblies through a wheel end assembly, and the wheel end assembly comprises a brake base plate, a brake caliper, a brake disc, a 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 low-suspension-height electric drive axle air suspension system of the semi-trailer comprises a tire and a rim, the tire is sleeved on the rim, and the rim is connected to the connecting part of the electric drive axle housing through the wheel end assembly.

[0018] A method for assembling a low-suspension-height electric drive axle air suspension system of a semi-trailer, for assembling the low-suspension-height electric drive axle air suspension system of the semi-trailer, the steps are as follows:

[0019] First step: install the power system on the mounting part of the electric drive axle housing, connect the two connecting parts of the electric drive axle housing with the two tire assemblies through the wheel end assembly, and then connect the power system with the wheel end assembly;

[0020] Second step: connect the two suspension assemblies with the two fixed parts of the electric drive axle housing through the connecting assembly;

[0021] Third step: connect the top of the frame assembly with the bottom of the trailer body, weld the bottom of the frame assembly with the supports and air springs of the two suspension assemblies, and connect the two longitudinal beams of the frame assembly with the upper pressing plates of the two suspension assemblies through the shock absorbers;

[0022] Fourth step: connect one end of the thrust rod with the top of the electric drive axle housing through the first mounting seat, and connect the other end of the thrust rod with the inner wall of the frame assembly through the second mounting seat.

[0023] The beneficial effects of the present application are:

[0024] The present application provides a low-suspension-height electric drive axle air suspension system for a semitrailer, which realizes the application of a central integrated electric drive axle for a semitrailer by setting the central integrated electric drive axle, the suspension assembly, the frame assembly, and the tire assembly to cooperate with each other, greatly expands the layout space of the power system, meets the long endurance requirement, improves the dynamic performance of the semitrailer, and reduces the operation cost. After checking, the layout space of the low-suspension-height electric drive axle air suspension system for a semitrailer is improved by at least 35% compared with that of a traditional semitrailer air suspension.

[0025] The low-suspension-height electric drive axle air suspension system for a semitrailer uses an integrated electric drive axle housing to install, fix, and connect the power system, the suspension assembly, and the tire assembly, which greatly expands the layout space and meets the application requirement of the vehicle.

[0026] The low-suspension-height electric drive axle air suspension system for a semitrailer uses a thrust assembly to rigidly connect with the electric drive axle housing and the frame assembly, which reduces the vibration and displacement of the central integrated electric drive axle, improves the stability of the vehicle during driving, especially during high-speed driving or sudden acceleration or braking, the thrust assembly can effectively suppress the swing of the central integrated electric drive axle, and improve the handling. The thrust assembly is used in cooperation with the suspension assembly, the central integrated electric drive axle, and the frame assembly, and after CAE checking, the roll angle stiffness of the suspension system can reach more than 50000 Nm / °, while the roll angle stiffness of the traditional semitrailer air suspension is about 20000 Nm / °, which significantly improves the lateral stability of the suspension. And the lateral displacement of the axle under the action of lateral force is reduced by more than 50% compared with that of the traditional semitrailer air suspension, which is beneficial to smooth driving and reduces the wear of the tire assembly.

[0027] The low-suspension-height semi-trailer electric drive axle air suspension system adopts a suspension assembly to achieve low-suspension-height design, thereby reducing the overall center of the vehicle. The low-center-of-gravity design improves the driving stability and anti-roll ability of the vehicle, is particularly suitable for high-speed driving and curved driving, and reduces the occupation of the space at the bottom of the vehicle, thereby 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 vehicle body but also installs and fixes the suspension assembly and the central integrated electric drive axle. When the central integrated electric drive axle outputs driving force to the tire assembly, the frame assembly bears the reaction force during braking and steering, thereby ensuring the rigidity of the vehicle body. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 FIG. 1 is a schematic view of a low-suspension-height semi-trailer electric drive axle air suspension system according to an embodiment of the present application;

[0030] Figure 2 FIG. 2 is a schematic view of a central integrated electric drive axle and a tire assembly of the low-suspension-height semi-trailer electric drive axle air suspension system according to the embodiment of the present application;

[0031] Figure 3 FIG. 3 is a schematic view of an electric drive axle housing of the low-suspension-height semi-trailer electric drive axle air suspension system according to the embodiment of the present application;

[0032] Figure 4 FIG. 4 is a schematic view of the electric drive axle housing, the suspension assembly, and the frame assembly of the low-suspension-height semi-trailer electric drive axle air suspension system according to the embodiment of the present application from one perspective;

[0033] Figure 5 FIG. 5 is a schematic view of the electric drive axle housing, the suspension assembly, and the frame assembly of the low-suspension-height semi-trailer electric drive axle air suspension system according to the embodiment of the present application from another perspective;

[0034] Figure 6 FIG. 6 is a schematic view of the suspension assembly of the low-suspension-height semi-trailer electric drive axle air suspension system according to the embodiment of the present application;

[0035] Figure 7 FIG. 7 is a sectional view of the suspension assembly and the electric drive axle housing of the low-suspension-height semi-trailer electric drive axle air suspension system according to the embodiment of the present application;

[0036] Figure 8 FIG. 8 is a top view of the suspension assembly and the electric drive axle housing of the low-suspension-height semi-trailer electric drive axle air suspension system according to the embodiment of the present application;

[0037] wherein:

[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 portion; 122, connecting portion; 123, fixing portion; 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, connecting head; 21, suspension assembly; 22, connecting assembly; 211, guide arm assembly; 212, bracket; 213, air spring; 221, upper pressing plate; 225, lower pressing plate; 222, first fastener; 223, shock absorber; 224, wear plate; 008, first positioning pin; 009, second positioning 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 gusset plate; 38, second gusset plate; 41, wheel end assembly; 42, tire; 43, rim. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objectives, features and advantages of the present application more apparent, a detailed description of the specific embodiments of the present application will be given below with reference to the accompanying drawings.

[0040] As shown in Figures 1-3 The embodiment of the present application provides a low-suspension-height electric drive axle air suspension system of a semitrailer, which comprises a central integrated electric drive axle 1, a suspension assembly 2 and a frame assembly 3. The central integrated electric drive axle 1 comprises a power system 11 and an electric drive axle housing 12. The two ends of the electric drive axle housing 12 are connected with the suspension assembly 2. The top of the suspension assembly 2 is connected with the frame assembly 3. The frame assembly 3 is located above the suspension assembly 2 and the electric drive axle housing 12. The frame assembly 3 is used for connecting with the semitrailer. The electric drive axle housing 12 comprises a mounting portion 121 for mounting the power system 11 and two connecting portions 122 which are symmetrically arranged at the two ends of the mounting portion 121. The fixing portion 123 is arranged between the connecting portion 122 and the mounting portion 121. The suspension assembly 2 comprises two symmetrically arranged suspension assemblies 21. The two suspension assemblies 21 are connected with the two fixing portions 123 through the connecting assembly 22. The electric drive axle housing 12 is of 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 with the two tire assemblies 4 through the wheel end assemblies 41, the power system 11 is connected with the wheel end assemblies 41, and the power system 11 drives the wheel end assemblies 41 to drive the two tire assemblies 4 to rotate. The two suspension assemblies 21 are respectively connected with the two fixed portions 123 of the electric drive axle housing 12 through the connecting assemblies 22, and the connecting assemblies 22 lock and fix the electric drive axle housing 12 and the two suspension assemblies 21 together. The top of the frame assembly 3 is connected with the bottom of the trailer body, the bottom of the frame assembly 3 is welded with the supports 212 and the air springs 213 of the two suspension assemblies 21, and the two longitudinal beams 31 of the frame assembly 3 and the upper pressing plates 221 of the two suspension assemblies 21 are connected through the shock absorbers 223. The mounting portion 121, the two fixed portions 123 and the two connecting portions 122 of the electric drive axle housing 12 are integrally cast. The power system 11 mainly consists of a driving motor and a transmission.

[0042] In the above structure, the mounting portion 121 of the electric drive axle housing 12 is used to install the power system 11, the two fixed 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 fixed portion 123 and the connecting portion 122 facilitates the connection with the suspension assembly 2 and the tire assembly 4, and greatly saves the occupied space. The integrally cast electric drive axle housing 12 not only strengthens the structural strength, but also improves the lightweight of the system. Through the setting of the central integrated electric drive axle 1, the suspension assembly 2 and the frame assembly 3, the central integrated electric drive axle 1 is applied to the low-suspension-height semi-trailer, the low-flat-height demand of the ordinary logistics vehicle is met, the layout space of the power system 11 is greatly expanded, the long-endurance demand is met, the efficient operation, lightweight design and dynamic performance optimization of the semi-trailer are realized. After checking, 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] As Figure 4As shown, in one embodiment, the low suspension height of the electric drive axle air suspension system of the semi-trailer is provided with a thrust assembly 13 between the electric drive axle housing 12 and the frame assembly 3, 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 installed on the top of the electric drive axle housing 12, the second mounting seat 133 is installed on the inner wall side end of the frame assembly 3, one end of the thrust rod 131 is hinged with the first mounting seat 132, the other end of the thrust rod 131 is hinged with the second mounting seat 133. The first mounting seat 132 is installed on the first mounting plate 001 of the electric drive axle housing 12, the second mounting seat 133 is installed on the inner wall of one of the longitudinal beams 31 of the frame assembly 3, one end of the thrust rod 131 is hinged with the first mounting seat 132, the other end of the thrust rod 131 is hinged with the second mounting seat 133. The thrust rod 131 is rigidly connected with the electric drive axle housing 12 and the frame assembly 3, reducing the vibration and displacement of the central integrated electric drive axle 1, improving the stability of the vehicle during driving, especially during high-speed driving or sudden acceleration, sudden braking, 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 cooperation with the suspension assembly 2, the central integrated electric drive axle 1 and the frame assembly 3, and the CAE check shows that the roll angle stiffness of the suspension system can reach more than 50000 Nm / °, while the roll angle stiffness of the traditional semi-trailer air suspension is about 20000 Nm / °, 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 beneficial to smooth driving and reduces the wear of the tire assembly 4.

[0044] As shown in the drawings, Figure 3 As shown, in one embodiment, the low suspension height of the electric drive axle air suspension system of the semi-trailer is provided with a thrust assembly 13 between the electric drive axle housing 12 and the frame assembly 3, 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 installed on the top of the electric drive axle housing 12, the second mounting seat 133 is installed on the inner wall side end of the frame assembly 3, one end of the thrust rod 131 is hinged with the first mounting seat 132, the other end of the thrust rod 131 is hinged with the second mounting seat 133. The first mounting seat 132 is installed on the first mounting plate 001 of the electric drive axle housing 12, the second mounting seat 133 is installed on the inner wall of one of the longitudinal beams 31 of the frame assembly 3, one end of the thrust rod 131 is hinged with the first mounting seat 132, the other end of the thrust rod 131 is hinged with the second mounting seat 133. The thrust rod 131 is rigidly connected with the electric drive axle housing 12 and the frame assembly 3, reducing the vibration and displacement of the central integrated electric drive axle 1, improving the stability of the vehicle during driving, especially during high-speed driving or sudden acceleration, sudden braking, 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 cooperation with the suspension assembly 2, the central integrated electric drive axle 1 and the frame assembly 3, and the CAE check shows that the roll angle stiffness of the suspension system can reach more than 50000 Nm / °, while the roll angle stiffness of the traditional semi-trailer air suspension is about 20000 Nm / °, 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 beneficial to smooth driving and reduces the wear of the tire assembly 4.

[0045] As shown in the drawings, Figure 3As shown in the drawings, in one embodiment, the fixed part 123 of the low-suspension-height air suspension system of the electric drive axle of the semitrailer includes a first fixed plate 003 and a second fixed plate 004, the first fixed plate 003 and the second fixed plate 004 are connected by two symmetrically arranged connecting plates 005, the second fixed plate 004 is located below the first fixed plate 003, the connecting part 122 includes an annular fixed plate 006 and a connecting head 007, the annular fixed plate 006 is sleeved on one end of the connecting head 007 close to the fixed part 123. The horizontally arranged first fixed plate 003 and the horizontally arranged second fixed plate 004 are connected by two vertically arranged connecting plates 005, forming a I-shaped fixed part 123. The fixed part 123 is arranged to facilitate the connecting assembly 22 to firmly lock the guide arm assembly 211 of the suspension assembly 21 and the fixed part 123 together. The connecting head 007 is connected with the tire assembly 4 through the wheel end assembly 41, and the wheel end assembly 41 is locked with the annular fixed plate 006 through a bolt assembly. The arrangement of the connecting part 122 facilitates the connection with the tire assembly 4 and facilitates the power system 11 to provide power support for the wheel end assembly 41 and the tire assembly 4.

[0046] As shown in the drawings, Figure 5 and Figure 6 As shown in the drawings, in one embodiment, the suspension assembly 21 of the low-suspension-height air suspension system of the electric drive axle of the semitrailer includes a guide arm assembly 211, a bracket 212, and an air spring 213, one end of the guide arm assembly 211 is connected with the bracket 212 through an axle distance adjusting mechanism, the other end of the guide arm assembly 211 is connected with 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 wrapped around the top end and the bottom end of the middle part of the guide arm assembly 211, the first fastener 222 is used to sequentially pass through the lower pressing plate 225, the upper pressing plate 221, and the fixed 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 pressing plate 221 and the frame assembly 3. The first fastener 222 includes four bolts and four self-locking nuts. The upper pressing plate 221 and the lower pressing plate 225 are wrapped around the middle part of the guide arm assembly 211, and then the guide arm assembly 211 is tightly arranged on the second fixed plate 004 of the electric drive axle housing 12, four bolts are sequentially passed through the lower pressing plate 225, the upper pressing plate 221, the second fixed plate 004, and the first fixed plate 003, and then locked by four self-locking nuts, so that the guide arm assembly 211 and the electric drive axle housing 12 are firmly locked together. The arrangement facilitates the locking of the two suspension assemblies 21 and the two fixed parts 123 of the electric drive axle housing 12 together, so that the arrangement space of the power system 11 between the two suspension assemblies 21 and the electric drive axle housing 12 is greatly expanded, meeting the long endurance demand of new energy trucks.

[0047] AsFigure 7 As shown in the drawings, in one embodiment, the upper pressing plate 221 of the low-suspension-height electric drive axle air suspension system of the semitrailer is provided with a first positioning pin 008 for positioning cooperation with the fixed part 123, and the guide arm assembly 211 is provided with a second positioning pin 009 for positioning cooperation with the upper pressing plate 221. The wear-resistant plate 224 is wrapped around the guide arm assembly 211, with the top end of the wear-resistant plate 224 located between the upper pressing plate 221 and the guide arm assembly 211, and the bottom end of the wear-resistant plate 224 located between the lower pressing plate 225 and the guide arm assembly 211. When the upper pressing plate 221 is wrapped around the guide arm assembly 211, the second positioning pin 009 of the guide arm assembly 211 extends into the positioning hole of the upper pressing plate 221 to position the upper pressing plate 221. When the guide arm assembly 211 drives the upper pressing plate 221 to abut against the second fixed plate 004 of the fixed part 123, the first positioning pin 008 of the upper pressing plate 221 extends into the positioning hole of the second fixed plate 004 to position the second fixed plate 004. The positioning pins 008 and 009 improve the positioning effect of the guide arm assembly 211 and the electric drive axle housing 12. The wear-resistant plate 224 is wrapped around the upper and lower ends of the middle part of the guide arm assembly 211. The wear-resistant plate 224 facilitates increasing the friction between the guide arm assembly 211 and the upper pressing plate 221 and the lower pressing plate 225, and improves the anti-slippage coefficient of the guide arm assembly 211 and the electric drive axle housing 12 in the event of road conditions.

[0048] As shown in the drawings, Figure 4 and Figure 5 As shown in the drawings, in one embodiment, the frame assembly 3 of the low-suspension-height electric drive axle air suspension system of the semitrailer includes two longitudinal beams 31 arranged symmetrically, two first channel steels 32 and two cross beams 33 arranged symmetrically between the two longitudinal beams 31, and two supports 212 of the suspension assembly 21 and the top of the air spring 213 welded to the two longitudinal beams 31, respectively. A second channel steel 34 is arranged between the two supports 212, and the second channel steel 34 is connected to the first channel steel 32 by two first reinforcing ribs 35, with the side ends of the first reinforcing ribs 35 welded to the supports 212 and the longitudinal beams 31. The longitudinal beams 31 are welded to the top of the supports 212 and the air spring 213 of the suspension assembly 21, thereby improving the connection strength of the longitudinal beams 31 and the suspension assembly 21. The longitudinal beams 31 are also provided with a shock absorber 223 connecting seat, the upper pressing plate 221 is provided with a shock absorber 223 support plate, 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 connecting seat. The two longitudinal beams 31, the two first channel steels 32, and the two cross beams 33 are all connected by welding. The frame assembly 3 not only bears the vehicle body but also installs and fixes the suspension assembly 2 and the central integrated electric drive axle 1. When the central integrated electric drive axle 1 outputs driving force to the tire assembly 4, it bears the reaction force during braking and steering, thereby ensuring the rigidity of the vehicle body.

[0049] As Figure 5 shown in one of the embodiments, the outer wall of the longitudinal beam 31 of the low-height air suspension system of the electric drive axle of the semi-trailer is provided with a plurality of second reinforcing ribs 36, and the end of the longitudinal beam 31 close to the support 212 is provided with a detachable first pad plate 37, which is connected with the support 212, and the inner wall of the longitudinal beam 31 is provided with a second pad plate 38 for reinforcing 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 support 212 to reinforce the local rigidity of the longitudinal beam 31. The first pad plate 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 assemblies 21. The second pad plate 38 is welded on the inner wall of the longitudinal beam 31 to facilitate the reinforcement of the local rigidity of the longitudinal beam 31.

[0050] As Figure 2 shown in one of the embodiments, the low-height air suspension system of the electric drive axle of the semi-trailer further comprises two tire assemblies 4, and the two connecting portions 122 of the electric drive axle housing 12 are respectively connected with the two tires 42 through the wheel end assembly 41, which comprises a brake bottom plate, a brake caliper, a brake disc, a 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 assembly 4 through the wheel end assembly 41 to provide power to the tire assembly 4.

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

[0052] As Figure 7 and Figure 8 shown, specific examples:

[0053] The guide arm assembly 211 includes a guide arm front section and a guide arm rear section. The lever arm ratio of the guide arm front section and the guide arm rear section is 500:380, the height from the axle center of the tire assembly 4 to the lower wing surface of the vehicle frame is 280mm, the upstroke stroke is 90mm, the downstroke 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 distance N between the two rim mounting surfaces of the two wheel 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 edge peak torque of the central integrated electric drive axle 1 can reach 35000Nm, not only realizing the application of the central integrated drive axle of the semitrailer, but also greatly meeting the long endurance demand of the semitrailer.

[0054] The embodiment of the present application also provides an assembly method of the low-suspension-height semitrailer electric drive axle air suspension system.

[0055] First step: installing the power system 11 on the mounting part 121 of the electric drive axle housing 12, connecting the two connecting parts 122 of the electric drive axle housing 12 with the two tire assemblies 4 through the wheel end assembly 41, and connecting the power system 11 with the wheel end assembly 41;

[0056] Second step: connecting the two suspension assemblies 21 with the two fixed parts 123 of the electric drive axle housing 12 through the connecting assembly 22;

[0057] Third step: connecting the top of the vehicle frame assembly 3 with the bottom of the trailer body, welding the bottom of the vehicle frame assembly 3 with the bracket 212 and the air spring 213 of the two suspension assemblies 21, and connecting the two longitudinal beams 31 of the vehicle frame assembly 3 with the upper pressing plate 221 of the two suspension assemblies 21 through the shock absorber 223;

[0058] Fourth step: connecting one end of the thrust rod 131 with the top of the electric drive axle housing 12 through the first mounting seat 132, and connecting the other end of the thrust rod 131 with the inner wall of the vehicle frame assembly 3 through the second mounting seat 133.

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

[0060] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A low-height air suspension system for an electric drive axle of a semi-trailer, characterized in that, The application relates to 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), the two ends of the electric drive axle housing (12) are connected with the suspension assembly (2), the top of the suspension assembly (2) is connected with the frame assembly (3), the frame assembly (3) is located above the suspension assembly (2) and the electric drive axle housing (12), the frame assembly (3) is used for being connected with a semitrailer, the electric drive axle housing (12) comprises a mounting part (121) for mounting the power system (11) and two symmetrical connecting parts (122) arranged at the two ends of the mounting part (121), a fixing part (123) is arranged between the connecting part (122) and the mounting part (121), the suspension assembly (2) comprises two symmetrical suspension assemblies (21), the two suspension assemblies (21) are connected with the two fixing parts (123) through connecting assemblies (22), and the electric drive axle housing (12) is of an integrated structure. The suspension assembly (21) comprises a guide arm assembly (211), a support (212) and an air spring (213), one end of the guide arm assembly (211) is connected with the support (212) through an axle distance adjusting mechanism, the other end of the guide arm assembly (211) is connected with the air spring (213), the connecting assembly (22) comprises 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 wrapped at the top end and the bottom end of the middle part of the guide arm assembly (211), the first fastener (222) is used for sequentially penetrating through the lower pressing plate (225), the upper pressing 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 pressing plate (221) and the frame assembly (3).

2. The low-height air suspension system for an electric drive axle of a semi-trailer 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), the thrust assembly (13) comprises 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), the second mounting seat (133) is mounted on the inner wall side end of the frame assembly (3), one end of the thrust rod (131) is hinged with the first mounting seat (132), and the other end of the thrust rod (131) is hinged with the second mounting seat (133).

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

4. The low-height tractor trailer electric drive axle air suspension system of claim 1, wherein, The fixed part (123) comprises a first fixed plate (003) and a second fixed plate (004), the first fixed plate (003) and the second fixed plate (004) are connected through two symmetrically arranged connecting plates (005), the second fixed plate (004) is located below the first fixed plate (003), the connecting part (122) comprises an annular fixed plate (006) and a connecting head (007), the annular fixed plate (006) is sleeved on one end of the connecting head (007) close to the fixed part (123).

5. The low-height tractor trailer electric drive axle air suspension system of claim 4, wherein, The upper pressing plate (221) is provided with a first positioning pin (008) for positioning cooperation with the fixed part (123), the guide arm assembly (211) is provided with a second positioning pin (009) for positioning cooperation with the upper pressing plate (221), the guide arm assembly (211) is provided with a wear-resistant plate (224), the top end of the wear-resistant plate (224) is located between the upper pressing plate (221) and the guide arm assembly (211), and the bottom end of the wear-resistant plate (224) is located between the lower pressing plate (225) and the guide arm assembly (211).

6. The low-profile air suspension system for an electric drive axle of a semi-trailer according to claim 1, wherein, The frame assembly (3) comprises two longitudinal beams (31) arranged symmetrically, two first channel steels (32) and two cross beams (33) arranged symmetrically between the two longitudinal beams (31), the two longitudinal beams (31) are respectively welded with the supports (212) of the two suspension assemblies (21) and the top of the air springs (213), a second channel steel (34) is arranged between the two supports (212), the second channel steel (34) is connected with the first channel steel (32) through two first reinforcing ribs (35), and the side ends of the first reinforcing ribs (35) are welded with the supports (212) and the longitudinal beams (31).

7. The low-height tractor trailer electric drive axle air suspension system of claim 6, wherein, A plurality of second reinforcing ribs (36) are arranged on the outer wall of the longitudinal beam (31), a detachable first pad plate (37) is arranged at one end of the longitudinal beam (31) close to the support (212), the first pad plate (37) is connected with the support (212), and a second pad plate (38) is arranged on the inner wall of the longitudinal beam (31), and the second pad plate (38) is used for strengthening the rigidity of the longitudinal beam (31).

8. The low-profile air suspension system for an electric drive axle of a semi-trailer according to claim 1, wherein, Further comprising two tire assemblies (4), the two connecting parts (122) of the electric drive axle housing (12) are connected with two tires (42) through wheel end assemblies (41) respectively, the wheel end assembly (41) comprises a brake base plate, a brake caliper, a brake disc, a 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 with the connecting part (122) of the electric drive axle housing (12) through the wheel end assembly (41).

9. A method for assembling a low-height air suspension system of an electric drive axle of a semi-trailer, for assembling a low-height air suspension system of an electric drive axle of a semi-trailer according to any one of claims 1 to 8, characterized in that, The steps are: First step: install the power system (11) on the mounting part (121) of the electric drive axle housing (12), connect the two connecting parts (122) of the electric drive axle housing (12) with the two tire assemblies (4) through the wheel end assembly (41), and then connect the power system (11) with the wheel end assembly (41); Second step: two suspension assemblies (21) are connected with two fixed parts (123) of the electric drive axle housing (12) through the connecting assembly (22) respectively; Third step: the top of the frame assembly (3) is connected with the bottom of the trailer body, the bottom of the frame assembly (3) is welded with the support (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 pressing plate (221) of the two suspension assemblies (21) are connected through the shock absorber (223); Fourth step: one end of the thrust rod (131) is connected with 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 with the inner wall of the frame assembly (3) through the second mounting seat (133).

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