Truck chassis assembly and 4*2 truck

Abstract

The utility model relates to a truck chassis assembly and a 4 * 2 truck, a truck chassis comprises a frame, a transmission, a drive axle, an engine and a connecting component, and the transmission is arranged on the frame; the drive axle is arranged on the side, away from the transmission, of the frame and connected with the transmission. The engine is arranged on the frame and is connected with the drive axle through the transmission; the transmission is connected with the frame through a connecting assembly, the connecting assembly and the frame jointly form a wire passing groove suitable for a pipeline harness to penetrate through, the connecting assembly comprises a support and a suspension which are connected with each other, the support is used for being connected with the transmission, and the suspension is used for being connected with the frame. The support, the suspension and the frame jointly define the wire passing groove which penetrates through and accommodates the pipeline harnesses of the engine and the transmission, so that the pipeline harnesses of the engine and the transmission can be effectively managed and protected, it is ensured that the pipeline harnesses are safely and neatly installed on the frame, and good layout and arrangement are provided.

Description

Technical Field

[0001] The utility model relates to the technical field of commercial passenger vehicles, in particular to a truck chassis assembly and a 4x2 truck. Background Art

[0002] Trucks play a vital role in modern logistics and transportation. They are the key link in delivering goods from production sites to consumers. With economic development and the growth of global trade, the demand for trucks is also increasing. In this context, the design and manufacture of trucks need to meet the requirements of efficiency, reliability and safety to cope with the growing demand for cargo transportation.

[0003] In the field of trucks, the layout and management of pipe harnesses is also a key technical challenge. The pipe harnesses on the truck chassis usually include electrical and hydraulic lines from the engine, transmission, brake system, electrical system, etc. They need to be effectively arranged and protected to ensure the normal operation and safety of the vehicle.

[0004] In the existing truck chassis, the pipe harnesses are often arranged in a disorderly manner, which not only affects the appearance, but also easily causes cross interference between the pipes. The disorderly arrangement of the pipe harnesses not only makes maintenance and repair difficult, but also increases the difficulty of troubleshooting, reducing the reliability and maintenance efficiency of the vehicle. The pipe harnesses are exposed to the external environment and are easily affected by mechanical collisions, chemical corrosion and other factors, which may cause damage or short circuit of the pipe harnesses, thereby causing vehicle failures. Utility Model Content

[0005] Based on this, it is necessary to provide a truck chassis assembly and a 4x2 truck to address the above problems.

[0006] The present application provides a truck chassis assembly, including a frame, a transmission, a drive axle, an engine and a connecting assembly, wherein the transmission is arranged on the frame; the drive axle is arranged on a side of the frame away from the transmission and is connected to the transmission; the engine is arranged on the frame, and the engine is connected to the drive axle through the transmission; the transmission is connected to the frame through a connecting assembly, and the connecting assembly and the frame together form a wire groove suitable for passing a pipe harness, and the connecting assembly includes a bracket and a suspension connected to each other, the bracket is used to connect the transmission, and the suspension is used to connect the frame.

[0007] In one embodiment, the bracket includes a mounting structure suitable for mounting the transmission and a connecting structure suitable for connecting the suspension, the mounting structure is provided with a plurality of first connecting holes, and reinforcing ribs are provided between the plurality of connecting holes; the connecting structure is provided with a second connecting hole, and the second connecting hole is suitable for connecting the suspension, and the connecting structure is also provided with a protrusion, and the protrusion is suitable for abutting the suspension for positioning.

[0008] In one embodiment, the outer width of the frame is 865 mm and the wheelbase of the frame is 5300.

[0009] In one embodiment, the maximum power of the engine is 320 horsepower, the maximum torque of the engine is 1125 Newton meters, and the transmission is a 12-speed AMT.

[0010] In one embodiment, the drive axle is a φ378 rear axle or a φ435 rear axle.

[0011] In one embodiment, the speed ratios of the gears 1-12 of the transmission are 12.189, 9.419, 7.348, 5.784, 4.475, 3.502, 2.724, 2.105, 1.642, 1.293, 1.000, and 0.783 respectively.

[0012] In one embodiment, the drive axle is a φ378 rear axle, and the rear axle speed ratio is 3.727.

[0013] In one of the embodiments, the transmission controller TCU outputs a gear signal, and the engine controller ECU receives the gear signal. When the gear signal is the first gear, the engine controller ECU controls the engine to limit torque to 900 Nm.

[0014] In one of the embodiments, when the gear position signal indicates a gear other than the first gear, the engine controller ECU does not limit the engine output torque.

[0015] The present application also provides a 4x2 truck, comprising the above-mentioned truck chassis assembly.

[0016] In the above-mentioned truck chassis assembly, the frame is the main supporting structure of the vehicle, bearing the weight of the entire vehicle and providing assembly points for installing other components. The transmission is used to adjust the engine output power and transmit the appropriate torque to the drive wheel. The drive axle is a bridge connecting the drive wheels of the vehicle. The engine is used to provide power to drive the vehicle, is installed on the frame, and is connected to the drive axle through the transmission. The connecting assembly is used to connect the transmission, the engine and the frame to ensure the correct position and stable connection between these components. In this embodiment, the connecting assembly includes a bracket and a suspension. The bracket, the suspension and the frame are jointly enclosed to form a wire groove that penetrates and accommodates the pipe and wire harness of the engine and the transmission, which helps to effectively manage and protect the pipe and wire harness of the engine and the transmission to ensure that it is safely and neatly installed on the frame, and provides a good layout and arrangement. The wire groove provides a space to protect the pipe and wire harness from external environment and mechanical damage, extending the service life of the pipe and wire harness. The arrangement of the pipe and wire harness through the wire groove is more neat, reducing messy wiring, and facilitating maintenance and management. The wire groove minimizes the interference between the pipe and wire harness and other vehicle components, ensuring the stability and safety of the pipe and wire harness.

[0017] The above-mentioned 4x2 truck adopts the above-mentioned truck chassis assembly, so the bracket, suspension and frame are used together to form a wire groove that passes through and accommodates the pipe harness of the engine and transmission, which helps to effectively manage and protect the pipe harness of the engine and transmission. In addition, the engine with a maximum power of 320 horsepower is selected, and the maximum torque is increased by 10% compared with the 260-280 horsepower engine, and the power is better. The range of the 12-speed AMT transmission adopted is reduced by 7%, the difference between the speed ratios is smaller, and the change during gear shifting is smoother, which helps to improve the driving comfort and user experience of the vehicle. Due to the smaller difference between the speed ratios, the engine can work more effectively in different speed ranges, thereby improving fuel economy, reducing fuel consumption and emissions. The rear axle torque range of the 12-speed AMT is larger than that of the 8-speed AMT, with stronger power and better adaptability to working conditions. Compared with the maximum rear axle torque of 30704 Newton meters of the 8-speed AMT, the maximum rear axle torque of the 12-speed AMT can reach 39600 Newton meters, and the power can be improved by 29%. Under the premise of meeting the reliability requirements, this embodiment fully utilizes the torque capacity of the φ378 rear axle and improves the vehicle's power performance, thereby improving the vehicle's overall performance and driving experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the overall structure of a truck chassis assembly provided in one embodiment of the present application;

[0019] Figure 2 A schematic diagram of a partial structure of a truck chassis assembly provided in one embodiment of the present application;

[0020] Figure 3 A schematic diagram of the connection structure of the bracket and the suspension of the truck chassis assembly provided in one embodiment of the present application;

[0021] Figure 4 A schematic diagram of a support structure of a truck chassis assembly provided in one embodiment of the present application;

[0022] Figure 5 A torque output curve graph of an engine of a truck chassis assembly provided in one embodiment of the present application as a function of speed.

[0023] Description of reference numerals:

[0024] 100-frame;

[0025] 200-Transmission;

[0026] 300-drive axle;

[0027] 400 - engine;

[0028] 500-connecting assembly; 510-bracket; 511-installing structure; 5111-first connecting hole; 5112-reinforcing rib; 512-connecting structure; 5121-second connecting hole; 5122-protrusion; 520-suspension. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0035] See also Figure 1 and Figure 2An embodiment of the utility model provides a truck chassis assembly, including a frame 100, a transmission 200, a drive axle 300, an engine 400 and a connecting assembly 500. The transmission 200 is arranged on the frame 100; the drive axle 300 is arranged on a side of the frame 100 away from the transmission 200 and is connected to the transmission 200; the engine 400 is arranged on the frame 100, and the engine 400 is connected to the drive axle 300 through the transmission 200; the transmission 200 is connected to the frame 100 through the connecting assembly 500, and the connecting assembly 500 and the frame 100 jointly form a wire groove suitable for passing a pipe harness, and the connecting assembly 500 includes a bracket 510 and a suspension 520 connected to each other, the bracket 510 is used to connect the transmission 200, and the suspension 520 is used to connect the frame 100.

[0036] The frame 100 is the main supporting structure of the vehicle, bearing the weight of the entire vehicle and providing assembly points for installing other components. The transmission 200 is used to adjust the output power of the engine 400 and transmit the appropriate torque to the drive wheel. In this embodiment, the transmission 200 is arranged on the frame 100. In this embodiment, the drive axle 300 is located at the rear of the frame 100, and the drive axle 300 and the transmission are connected by a transmission shaft. The engine 400 is used to provide power to drive the vehicle, is installed on the frame 100, and is connected to the drive axle 300 through the transmission 200. The connecting assembly 500 is used to connect the transmission 200, the engine 400 and the frame 100 to ensure the correct position and stable connection between these components. In this embodiment, the connecting assembly 500 includes a bracket 510 and a suspension 520, and the bracket 510, the suspension 520 and the frame 100 are used to enclose a wire groove that passes through and accommodates the pipe harness of the engine 400 and the transmission 200. This design helps to effectively manage and protect the pipe harnesses of the engine 400 and the transmission 200, ensuring that they are safely and neatly installed on the vehicle frame 100, and providing good layout and arrangement. The wire trough provides a space to protect the pipe harnesses from external environmental and mechanical damage, extending the service life of the pipe harnesses. The arrangement of the pipe harnesses through the wire trough is more neat, reducing messy wiring and facilitating maintenance and management. The wire trough minimizes interference between the pipe harnesses and other vehicle components, ensuring the stability and safety of the pipe harnesses.

[0037] See also Figure 3 and Figure 4In one embodiment, the bracket 510 includes a mounting structure 511 suitable for mounting the transmission 200 and a connecting structure 512 suitable for connecting the suspension 520, the mounting structure 511 is provided with a plurality of first connecting holes 5111, and reinforcing ribs 5112 are provided between the plurality of connecting holes; the connecting structure 512 is provided with a second connecting hole 5121, the second connecting hole 5121 is suitable for connecting the suspension 520, and the connecting structure 512 is also provided with a protrusion 5122, and the protrusion 5122 is suitable for abutting the suspension 520 for positioning. Specifically in this embodiment, the number of the first connecting holes 5111 is four, and the reinforcing ribs 5112 are cross-arranged between the four first connecting holes 5111 to improve the connection strength between the bracket 510 and the transmission 200. A through hole is also opened in the connecting structure 512 to reduce the weight of the structure. The second connecting hole 5121 is arranged on the end of the connecting structure 512 extending outward, and the protrusion 5122 is also arranged on the end. The axial rotation deviation between the bracket 510 and the suspension 520 is reduced by the abutment between the protrusion 5122 and the suspension 520.

[0038] In one embodiment, the outer width of the frame 100 is 865 mm, and the wheelbase of the frame 100 is 5300 mm. The outer width of the frame 100 refers to the width of the frame 100 in the horizontal direction, which is usually determined by the vehicle design to adapt to the overall size and stability requirements of the vehicle. In this embodiment, the outer width of the frame 100 is 865 mm. The wheelbase refers to the horizontal distance between the centers of the front and rear wheel axles of the vehicle, which is the distance between the front and rear wheels of the vehicle. The wheelbase directly affects the driving stability and ride comfort of the vehicle. In this embodiment, the wheelbase is 5300 mm.

[0039] In one embodiment, the maximum power of the engine 400 is 320 horsepower, the maximum torque of the engine 400 is 1125 Newton meters, and the transmission 200 is a 12-speed AMT. In this embodiment, an engine 400 with a maximum power of 320 horsepower is selected. Compared with a 260-280 horsepower engine 400, the maximum torque is increased by 10%, and the power is better. The maximum power of the engine 400 means that the engine 400 can output the maximum power at a certain speed. The power is an important indicator to describe the performance of the engine 400, which directly affects the acceleration performance and maximum speed of the vehicle. The maximum torque of the engine 400 is 1125 Newton meters. Torque is a physical quantity that describes the output torque of the engine 400. It affects the starting and climbing ability of the vehicle, as well as the performance when towing heavy loads. The transmission 200 is a 12-speed AMT. AMT stands for Automated Manual Transmission 200, which combines the characteristics of the automatic transmission 200 and the manual transmission 200, providing more convenient driving operations while retaining the efficiency and controllability of the manual transmission 200. However, the 8-speed AMT and 10-speed AMT that are currently used in 4×2 trucks on the market have a certain degree of gear shifting frustration and power reduction, and the user experience has not been greatly improved compared to MT. Especially in uphill conditions, the frustration is strong. At this time, if there are more gears, the gear shifting can be smoother. In addition, the gear shifting of AMT is not as direct as that of MT, and when power is needed, the downshifting is not as fast as that of humans. Therefore, matching high-horsepower with multi-speed AMT can not only improve the power reduction of AMT compared to MT, but also make gear shifting smoother, and obtain a better driving experience.

[0040] In one embodiment, the drive axle 300 is a φ378 rear axle or a φ435 rear axle. The φ378 rear axle refers to a rear axle with a diameter of 378 mm for the drive axle 300. This rear axle may be lighter and suitable for some medium-sized trucks, especially when there are certain requirements for cost and fuel economy. The φ435 rear axle refers to a rear axle with a diameter of 435 mm for the drive axle 300. Compared with the φ378 rear axle, this rear axle is more sturdy and durable, and is suitable for some medium-sized trucks that require higher load-bearing capacity and more severe working conditions. Choosing rear axles of different specifications will affect the performance and scope of application of the entire vehicle, such as load-bearing capacity, durability, and cost. Therefore, when designing and selecting the vehicle chassis, it is necessary to take into account the specific use environment and needs of the vehicle to ensure that it can meet the expected performance and reliability requirements.

[0041] In one embodiment, the speed ratios of the transmission 2001-12 gears are 12.189, 9.419, 7.348, 5.784, 4.475, 3.502, 2.724, 2.105, 1.642, 1.293, 1.000, 0.783. For reference, the speed ratios of the 8-speed AMT transmission 2001-8 gears are 7.323, 5.218, 3.761, 2.846, 1.947, 1.388, 1.000, 0.757. It can be seen that compared with the 8-speed AMT transmission 200, the range of the 12-speed AMT transmission 200 used in this embodiment is reduced by 7%, and the gear shifting is smoother because the difference between the speed ratios is smaller and the change during gear shifting is smoother, which helps to improve the driving comfort and user experience of the vehicle. Since the difference between the speed ratios is smaller, the engine 400 can operate more efficiently in different speed ranges, thereby improving fuel economy and reducing fuel consumption and emissions. Since the 12-speed AMT transmission 200 has more gear options, the vehicle can better adapt to different driving conditions and road conditions, such as providing more appropriate power output when starting, accelerating, climbing or high-speed cruising.

[0042] In one embodiment, the drive axle 300 is a φ378 rear axle, and the rear axle speed ratio is 3.727. In this embodiment, when the rear axle speed ratio is 3.727, the maximum output torques of the rear axles in gears 1-12 are 51107, 39493, 30809, 24252, 18763, 14683, 11421, 8826, 6885, 5421, 4193, and 3283 Newton meters, respectively. In contrast, under the 8-speed AMT, the maximum output torques of the rear axles in gears 1-8 are 30704, 21878, 15769, 11933, 8164, 5820, 4193, and 3174 Newton meters, respectively. It can be seen that the rear axle torque range of the 12-speed AMT is larger than that of the 8-speed AMT, with stronger power and better adaptability to working conditions.

[0043] In one embodiment, the controller TCU of the transmission 200 outputs a gear signal, and the controller ECU of the engine 400 receives the gear signal. When the gear signal is the first gear, the controller ECU of the engine 400 controls the engine 400 to limit the torque to 900 Nm. In this embodiment, considering that the peak torque allowed by the φ378 rear axle is 39,600 Nm, the maximum output torque of the rear axle in the first gear of the 12-speed AMT is 51,107 Nm, which exceeds the peak torque allowed by the φ378 rear axle, and there is a reliability risk. To solve this risk, a higher specification φ435 rear axle can be selected, but the cost increases a lot. At the same time, considering that the maximum output torque of the current 8-speed rear axle has met the needs of users, it is chosen to make full use of the φ378 torque capacity, that is, to limit the maximum torque of the rear axle output in the first gear to 39,600 Nm. Compared with the maximum rear axle torque of 30,704 Nm of the 8-speed AMT, the maximum torque of the rear axle matched with the 12-speed AMT can reach 39,600 Nm, and the power can be improved by 29%. This embodiment fully utilizes the torque capacity of the φ378 rear axle while meeting the reliability requirements, and improves the vehicle's power performance, thereby improving the vehicle's overall performance and driving experience. Figure 5 , Figure 5 The torque output curve of the engine 400 used in this application is a curve of torque versus speed. Curve 1 is the curve of torque output versus speed before the engine 400 is torque limited, and curve 2 is the curve of torque output versus speed after the engine 400 is torque limited.

[0044] In one embodiment, when the gear signal is a gear other than the first gear, the controller ECU of the engine 400 does not limit the output torque of the engine 400. This means that the engine 400 can freely output its maximum torque in other gears to meet the needs of different driving conditions. This design takes into account the power requirements of the vehicle under different working conditions. Normally, a larger torque is required to provide sufficient power when starting and driving at low speeds. But once the vehicle enters a high-speed driving state, the torque requirement may decrease, and increasing the speed is more critical. Therefore, not limiting the output torque of the engine 400 in gears other than the first gear helps ensure that the vehicle can freely provide additional power when a higher speed is required. Such a design helps to improve the flexibility and responsiveness of the vehicle, enhance the driving experience, and ensure that the vehicle has sufficient power performance under various driving conditions.

[0045] The utility model also provides a 4x2 truck, including the above truck chassis assembly. By adopting the above truck chassis assembly, the bracket 510, the suspension 520 and the frame 100 are used to form a wire groove that passes through and accommodates the pipe harness of the engine 400 and the transmission 200, which helps to effectively manage and protect the pipe harness of the engine 400 and the transmission 200. The engine 400 with a maximum power of 320 horsepower is selected. Compared with the 260-280 horsepower engine 400, the maximum torque is increased by 10%, and the power performance is better. The range of the 12-speed AMT transmission 200 used is reduced by 7%, the difference between the speed ratios is smaller, and the change during gear shifting is smoother, which helps to improve the driving comfort and user experience of the vehicle. Due to the smaller difference between the speed ratios, the engine 400 can work more effectively in different speed ranges, thereby improving fuel economy and reducing fuel consumption and emissions. The rear axle torque range of the 12-speed AMT is larger than that of the 8-speed AMT, with stronger power and better adaptability to working conditions. Compared with the maximum rear axle torque of 30,704 Nm of the 8-speed AMT, the maximum rear axle torque of the 12-speed AMT can reach 39,600 Nm, and the power can be improved by 29%. Under the premise of meeting the reliability requirements, this embodiment fully utilizes the torque capacity of the φ378 rear axle and improves the power performance of the vehicle, thereby improving the overall performance and driving experience of the vehicle.

[0046] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A truck chassis assembly, characterized in that: include: Frame (100); A transmission (200), wherein the transmission (200) is arranged on the vehicle frame (100); A drive axle (300), the drive axle (300) being arranged on a side of the vehicle frame (100) away from the transmission (200) and connected to the transmission (200); An engine (400), the engine (400) being arranged on the vehicle frame (100), and the engine (400) being connected to the drive axle (300) via the transmission (200); A connection assembly (500), wherein the transmission (200) is connected to the vehicle frame (100) via the connection assembly (500), wherein the connection assembly (500) and the vehicle frame (100) together form a wire groove suitable for passing a pipe harness, wherein the connection assembly (500) comprises a bracket (510) and a suspension (520) connected to each other, wherein the bracket (510) is used to connect the transmission (200), and the suspension (520) is used to connect the vehicle frame (100).

2. The truck chassis assembly according to claim 1, characterized in that: The bracket (510) comprises a mounting structure (511) suitable for mounting the transmission (200) and a connecting structure (512) suitable for connecting the suspension (520), wherein a plurality of first connecting holes (5111) are provided on the mounting structure (511), and reinforcing ribs (5112) are provided between the plurality of connecting holes; The connection structure (512) is provided with a second connection hole (5121), and the second connection hole (5121) is suitable for connecting the suspension (520). The connection structure (512) is also provided with a protrusion (5122), and the protrusion (5122) is suitable for abutting against the suspension (520) for positioning.

3. The truck chassis assembly according to claim 1, characterized in that: The outer width of the frame (100) is 865 mm, and the wheelbase of the frame (100) is 5300.

4. The truck chassis assembly according to claim 1, characterized in that: The maximum power of the engine (400) is 320 horsepower, the maximum torque of the engine (400) is 1125 Newton meters, and the transmission (200) is a 12-speed AMT.

5. The truck chassis assembly according to claim 4, characterized in that: The drive axle (300) is a φ378 rear axle or a φ435 rear axle.

6. The truck chassis assembly according to claim 4, characterized in that: The speed ratios of the 1st to 12th gears of the transmission (200) are 12.189, 9.419, 7.348, 5.784, 4.475, 3.502, 2.724, 2.105, 1.642, 1.293, 1.000, and 0.783 respectively.

7. The truck chassis assembly according to claim 5, characterized in that: The driving axle (300) is a φ378 rear axle, and the rear axle speed ratio is 3.

727.

8. The truck chassis assembly according to claim 7, characterized in that: The controller TCU of the transmission (200) outputs a gear signal, and the controller ECU of the engine (400) receives the gear signal. When the gear signal is the first gear, the controller ECU of the engine (400) controls the engine (400) to limit the torque to 900 Newton meters.

9. The truck chassis assembly according to claim 8, characterized in that: When the gear position signal indicates a gear position other than the first gear, the controller ECU of the engine (400) does not restrict the output torque of the engine (400).

10. A 4x2 truck, characterized in that: A truck chassis assembly comprising any one of claims 1-9.

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