semitrailer

Abstract

This utility model provides a semi-trailer, including a frame and an electric drive system. The frame includes two main beams spaced apart. The electric drive system includes an electronic control device and a thermal management device, which are positioned between the two main beams. This design allows the frame to protect the electronic control device and thermal management device, preventing them from malfunctioning due to collisions with flying debris or other debris on rough roads. The electronic control device and thermal management device are distributed along the front-rear direction of the frame, with the thermal management device positioned behind it. This allows the hot airflow from the thermal management device to be directly discharged from the rear of the semi-trailer, preventing the hot airflow from directly blowing onto the electronic control device and thus avoiding performance degradation.

Description

Technical Field

[0001] This utility model relates to the field of semi-trailer technology, and in particular to a semi-trailer. Background Technology

[0002] With the advent of the electrification wave in commercial vehicles, major manufacturers are attempting to integrate power batteries and electric drive axles into trailers. However, similar to the early stages of new energy passenger vehicle development which adopted a "convert from gasoline to electric" approach, the current mainstream, and even the only, solution is to treat the electric drive system as an accessory mounted on a traditional semi-trailer. This means the electric drive system is exposed on the outside of the trailer, with weak protection and significant safety hazards. Especially for engineering vehicles operating on rough roads, they are prone to collisions with flying debris and other objects. A collision could result in system failure, battery thermal runaway, or even the total loss of the vehicle. This severely limits the speed of commercial vehicle electrification development. Utility Model Content

[0003] The purpose of this invention is to solve the problem that the electronic control devices and thermal management devices of existing semi-trailers are prone to malfunction due to being easily bumped and knocked on the outside of the main beam.

[0004] To solve the above-mentioned technical problems, this utility model provides a semi-trailer, including a frame and an electric drive system; the frame includes two main beams, which are spaced apart; the electric drive system includes an electronic control device and a thermal management device, both of which are disposed between the two main beams, with the thermal management device located behind the electronic control device.

[0005] In some embodiments of this application, there is a gap between the thermal management device and the electronic control device, the gap being sufficient for airflow to dissipate heat from the thermal management device.

[0006] In some embodiments of this application, the thermal management device includes a heat exchanger and a fan, the heat exchanger and the fan being distributed along the front-rear direction of the vehicle frame, and the fan driving the airflow passing through the heat exchanger to flow away from the electronic control device when it is working.

[0007] In some embodiments of this application, the electronic control device includes a power battery, a high-voltage distribution box, and a controller. The power battery, the high-voltage distribution box, and the controller are arranged sequentially along the front-rear direction of the vehicle frame. The high-voltage distribution box is electrically connected to the power battery and the controller via wires. The thermal management device is connected to the heat exchange channel of the power battery via a cooling pipe.

[0008] In some embodiments of this application, the power battery has a battery wiring portion located on the side of the power battery closer to the high-voltage distribution box; there is a wiring gap between the power battery and the high-voltage distribution box, which can be used to connect the wires and the cooling pipes to the power battery.

[0009] In some embodiments of this application, there is a distance between the side of the high-voltage distribution box and the main beam, the gap between the side of the high-voltage distribution box and the main beam forms a first wiring space, the high-voltage distribution box has a high-voltage distribution box wiring part, and the high-voltage distribution box wiring part is located on the side of the high-voltage distribution box close to the first wiring space. There is a distance between the side of the controller and the main beam, and the gap between the side of the controller and the main beam forms a second wiring space. The position of the second wiring space corresponds to the position of the first wiring space. The controller has a first control wiring part, which is located on the side of the controller closer to the second wiring space. The first control wiring part is electrically connected to the high-voltage distribution box wiring part by a wire, and the wire between the first control wiring part and the high-voltage distribution box wiring part is arranged in the first wiring space and the second wiring space.

[0010] In some embodiments of this application, the controller is located on the side close to the thermal management device; the cooling pipe between the thermal management device and the power battery passes through the first wiring space and the second wiring space.

[0011] In some embodiments of this application, the electric drive system further includes an electric drive bridge, which is disposed below the main beam and electrically connected to the controller; the electric drive bridge is connected to the thermal management device via a cooling pipe.

[0012] In some embodiments of this application, the electric drive bridge has an electric drive wiring portion located at the top of the electric drive bridge; a second control wiring portion is provided on the rear side of the controller, and the second control wiring portion is electrically connected to the electric drive wiring portion.

[0013] In some embodiments of this application, the electric drive system further includes a battery; the battery is disposed on the side of the thermal management device away from the electronic control device, and the battery and the thermal management device are spaced apart; or, the battery is disposed between the thermal management device and the electronic control device.

[0014] As can be seen from the above technical solution, the beneficial effects of this utility model are as follows: The semi-trailer of this application includes a frame and an electric drive system. The frame comprises two main beams spaced apart. The electric drive system includes an electronic control device and a thermal management device, which are positioned between the two main beams. This design allows the frame to protect the electronic control device and thermal management device, preventing them from malfunctioning due to collisions with flying debris or other debris when the semi-trailer is traveling on rough roads. The electronic control device and thermal management device are distributed along the front-rear direction of the frame, with the thermal management device positioned behind the electronic control device. This allows the hot airflow from the thermal management device to be directly discharged from the rear of the semi-trailer, preventing the hot airflow from the thermal management device from directly blowing onto the electronic control device and causing a performance degradation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a semi-trailer in one embodiment.

[0016] Figure 2 yes Figure 1 The diagram shows the semi-trailer from another perspective; the electric drive axle has been removed.

[0017] Figure 3 yes Figure 1 The diagram shows the main structural layout of the semi-trailer.

[0018] Figure 4 yes Figure 1 The diagram shows a top view of the semi-trailer.

[0019] Figure 5 This is a schematic diagram of the electric drive system in one embodiment; in which the electric drive bridge has been removed.

[0020] Figure 6 yes Figure 5 A schematic diagram of the electric drive system shown from another perspective; Figure 7 yes Figure 5 The diagram shows a top view of the electric drive system.

[0021] Figure 8 This is a schematic diagram of the semi-trailer in another embodiment.

[0022] Figure 9 yes Figure 8 The diagram shows the structure of the semi-trailer from another perspective.

[0023] Figure 10 yes Figure 8 The diagram shows the main structural layout of the semi-trailer.

[0024] Figure 11 This is a schematic diagram of the structure of a semi-trailer frame in one embodiment.

[0025] Figure 12 yes Figure 11 A magnified view of the structure at point A.

[0026] Figure 13 yes Figure 11 The diagram shows the structure of the semi-trailer frame from another perspective.

[0027] Figure 14 yes Figure 11 The diagram shows the front view of the semi-trailer frame.

[0028] Figure 15 yes Figure 11 The diagram shows a top view of the semi-trailer frame.

[0029] Figure 16 This is a schematic diagram of the battery support beam in one embodiment.

[0030] Figure 17 This is a schematic diagram of the structure of a mixer semi-trailer frame in one embodiment.

[0031] The annotations in the attached figures are explained as follows: 100 - Frame; 110 - Main beam; 111 - Web plate; 112 - Upper wing plate; 1121 - First connecting hole; 1122 - Second connecting hole; 113 - Lower wing plate; 114 - First main beam section; 115 - Second main beam section; 1151 - Inclined surface; 120 - Crossbeam; 121 - First crossbeam; 1211 - Mounting hole; 122 - Second crossbeam; 1221 - Weight reduction hole; 123 - Third crossbeam; 130 - Support beam; 131 - Battery support beam; 1311 - Connecting beam; 1312 - First protective plate; 13121 - Drain outlet; 1313 - Second protective plate; 132 - Controller support beam; 1321 - First Support beam; 1322-Second support beam; 133-Thermal management device support beam; 1331-Support plate; 1332-Reinforcing rod; 134-Battery support beam; 1341-Third support beam; 1342-Fourth support beam; 140-Installation space; 150-High voltage distribution box support beam; 160-Traction disc crossbeam; 170-Tail end beam; 180-Spring bracket; 181-First spring bracket; 182-Second spring bracket; 183-Third spring bracket; 184-Fourth spring bracket; 190-Diagonal brace; 191-First diagonal brace; 192-Second diagonal brace; 193-Third diagonal brace; 101-Front end; 102-Back end; 200 - Electric drive system; 210 - Electronic control device; 211 - Power battery; 2111 - Battery wiring section; 212 - High voltage distribution box; 2121 - High voltage distribution box wiring section; 213 - Controller; 2131 - First control wiring section; 2132 - Second control wiring section; 220 - Thermal management device; 230 - Electric drive bridge; 231 - Electric drive wiring section; 240 - Cooling pipe; 250 - Wire; 260 - Battery; 271 - First wiring space; 272 - Second wiring space; 273 - Third wiring space; 274 - Wiring gap. Detailed Implementation

[0032] Typical embodiments embodying the features and advantages of this utility model will be described in detail in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this utility model.

[0033] In the description of this application, it should be understood that, in the embodiments shown in the accompanying drawings, the indications of direction or positional relationships (such as up, down, left, right, front, and back, etc.) are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the accompanying drawings. If the description of the positions of these elements changes, these directional indications also change accordingly.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] See Figure 1 , Figure 2 as well as Figure 3 A semi-trailer includes a frame 100 and an electric drive system 200. The frame 100 includes two main beams 110 and a crossbeam 120, the two main beams 110 being spaced apart and connected to each other as a single structure by the crossbeams 120. The electric drive system 200 is mounted on the frame 100 and is used to drive the movement of the semi-trailer.

[0036] The electric drive system 200 includes an electronic control unit 210, a thermal management unit 220, and an electric drive axle 230. The electronic control unit 210 is electrically connected to the drive motor of the electric drive axle 230, which is connected to the wheels, enabling the electronic control unit 210 to control the electric drive axle 230 to drive the wheels and move the semi-trailer. The electric drive axle 230 is located below the main beam 110 for easy connection to the wheels. The thermal management unit 220 is connected to the electronic control unit 210 and the electric drive axle 230 via a cooling pipe 240, and is used to dissipate heat from the electronic control unit 210 and the electric drive axle 230.

[0037] The electronic control device 210 and the thermal management device 220 are both mounted between the two main beams 110, so that the frame 100 protects the electronic control device 210 and the thermal management device 220. It makes full use of the strength and rigidity of the frame 100 to provide protection and avoid the problem of the electronic control device 210 and the thermal management device 220 malfunctioning when the semi-trailer is traveling on bad road conditions and colliding with flying gravel, etc. It can also effectively reduce the weight of adding extra protective structures, thereby reducing the weight of the whole vehicle.

[0038] The thermal management device 220 is located behind the electronic control device 210, allowing the hot airflow from the thermal management device 220 to be directly discharged from the rear of the semi-trailer, preventing the hot airflow from the thermal management device 220 from directly blowing on the electronic control device 210 and causing a decrease in the performance of the electronic control device 210. The thermal management device 220 is located behind the electric drive axle 230, allowing the hot airflow from the thermal management device 220 to be directly discharged from the rear of the semi-trailer, preventing the hot airflow from the thermal management device 220 from directly blowing on the electric drive axle 230 and causing a decrease in the performance of the electric drive axle 230.

[0039] In one embodiment, there is a gap between the thermal management device 220 and the electronic control device 210. The gap allows airflow to pass through to dissipate heat from the thermal management device 220 and also provides operating space for the connection of the wires 250 between the electronic control device 210 and the electric drive bridge 230, as well as the connection of the cooling pipes 240 between the thermal management device 220 and the electric drive bridge 230.

[0040] The thermal management device 220 includes a heat exchanger connected to a heat exchange channel on the electronic control device 210, so that the coolant in the heat exchange channel can carry the heat of the electronic control device 210 to the heat exchanger and dissipate it to the external environment, thereby cooling the electronic control device 210.

[0041] The thermal management device 220 also includes a booster pump connected in series between the heat exchanger and the heat exchange channel to drive the coolant to flow between the heat exchanger and the heat exchange channel, thereby bringing the heat from the electronic control device 210 to the heat exchanger.

[0042] The thermal management device 220 also includes a fan. The heat exchanger and the fan are distributed along the front-rear direction of the frame 100. When the fan is working, it drives the airflow passing through the heat exchanger to flow away from the electronic control device 210, so as to avoid the hot airflow after heat exchange with the heat exchanger blowing directly on the electronic control device 210, which would cause a decrease in system performance. The fan can be specifically arranged on the rear side of the heat exchanger.

[0043] The thermal management device 220 also includes a housing, in which a heat exchanger, a booster pump and a fan are integrated, thereby facilitating the placement of the thermal management device 220 on the frame 100.

[0044] See Figure 4 In some embodiments, the thermal management device 220 has a distance between its side near the main beam 110 and the main beam 110, creating a third wiring space 273 between the thermal management device 220 and the main beam 110. The cooling pipe 240 between the thermal management device 220 and the electrical control device 210 passes through the third wiring space 273, allowing the cooling pipe 240 to be arranged along the inner wall of the web of the main beam 110, particularly between the upper and lower flanges of the main beam 110, thus improving the protection of the cooling pipe 240 by the main beam 110. The cooling pipe interface of the thermal management device 220 is located on the side near the main beam 110, facilitating the connection between the cooling pipe 240 and the thermal management device 220. Figure 4 In the embodiment shown, a third wiring space 273 is provided between the thermal management device 220 and the two main beams 110. The third wiring space 273 on one side can be used to run the cooling pipe 240, and the third wiring space 273 on the other side can be used to run the wire 250 that is electrically connected to the thermal management device 220.

[0045] See Figure 3 as well as Figures 5 to 7 The electronic control device 210 includes a power battery 211, a high-voltage distribution box 212, and a controller 213. The high-voltage distribution box 212 is electrically connected to the controller 213, and the power battery 211 is electrically connected to the high-voltage distribution box 212. The controller 213 is also electrically connected to the drive motor of the electric drive axle 230, enabling the controller 213 to control the high-voltage distribution box 212 to distribute the electricity stored in the power battery 211 to the drive axle 230 for use by the drive motor, thereby driving the semi-trailer. The thermal management device 220 is electrically connected to the controller 213, enabling the controller 213 to control the operation of the thermal management device 220. The thermal management device 220 is connected to the heat exchange channel of the power battery 211 through a cooling pipe 240, enabling the thermal management device 220 to cool the power battery 211.

[0046] The power battery 211, high-voltage distribution box 212, and controller 213 are arranged sequentially along the length of the main beam 110, so that the wiring 250 between the power battery 211, high-voltage distribution box 212, and controller 213 is minimized, making the wiring harness arrangement of the wires 250 more organized and smoother, effectively reducing product weight and improving assembly efficiency.

[0047] exist Figure 3 In the illustrated embodiment, the controller 213 is positioned near the electric drive axle 230, specifically above the front of the electric drive axle 230, resulting in shorter wiring between the controller 213 and the electric drive axle 230. In other words, the power battery 211 is positioned near the front of the frame 100, the high-voltage distribution box 212 is positioned behind the power battery 211, and the controller 213 is positioned behind the high-voltage distribution box 212. The controller 213 is located above the electric drive axle 230 and is positioned close to the electric drive axle 230 along the length of the beam 110. This arrangement of the power battery 211, high-voltage distribution box 212, and controller 213 along the front-rear direction of the frame 100 minimizes the wiring 250 between the power battery 211, high-voltage distribution box 212, controller 213, and electric drive axle 230, resulting in a more organized and smoother wiring harness arrangement. This effectively reduces product weight and improves assembly efficiency.

[0048] The power battery 211 has a battery wiring section 2111, which is located on the side of the power battery 211 close to the high voltage distribution box 212, so that when the power battery 211 is electrically connected to the high voltage distribution box 212 through its battery wiring section 2111, the length of the wire 250 harness is shorter.

[0049] There is a wiring gap 274 between the power battery 211 and the high-voltage distribution box 212. The wiring gap 274 can be used to connect the operating wires 250 and the cooling pipes 240 to the power battery 211, so that the connection of the power battery 211's wires 250 and cooling pipes 240 makes the overall installation of the semi-trailer's electric drive system 200 more convenient.

[0050] In some embodiments, the height of the high-voltage distribution box 212 is less than the height of the power battery 211. Setting the top surface of the high-voltage distribution box 212 flush with the top surface of the power battery 211 creates a greater distance between the bottom surface of the high-voltage distribution box 212 and the ground, reducing the risk of the high-voltage distribution box 212 being struck by flying debris. This arrangement also creates a height difference between the bottom surface of the high-voltage distribution box 212 and the bottom surface of the power battery 211, facilitating wiring work on the power battery 211 and connecting the cooling pipes 240 from below the high-voltage distribution box 212, and simplifying future maintenance of the power battery 211.

[0051] The width of the high-voltage distribution box 212 is smaller than the distance between the two main beams 110. There is a distance between the side of the high-voltage distribution box 212 and the main beam 110, forming a first wiring space 271. The high-voltage distribution box 212 has a high-voltage distribution box wiring section 2121, located on the side of the high-voltage distribution box 212 closest to the main beam 110, i.e., close to the first wiring space 271, allowing operators to easily wire the high-voltage distribution box 212 within the first wiring space 271. This arrangement fully utilizes the space between the high-voltage distribution box 212 and the main beam 110, making the semi-trailer structure more compact. Figure 4 In the embodiment shown, the high-voltage distribution box 212 is provided with a high-voltage distribution box wiring part 2121 on the side of each of the two main beams 110, and a first wire passage space 271 is provided between the high-voltage distribution box 212 and the two main beams 110.

[0052] See Figure 4 and Figure 5 The width of the controller 213 is smaller than the distance between the two main beams 110, and the distance between the side of the controller 213 and the main beam 110 forms a second wiring space 272. The controller 213 has a first control wiring section 2131, which is located on the side of the controller 213 closest to the main beam 110, i.e., close to the second wiring space 272, allowing operators to wire the controller 213 within the second wiring space 272. This arrangement fully utilizes the space between the controller 213 and the main beam 110, making the semi-trailer structure more compact.

[0053] The position of the second wiring space 272 corresponds to the position of the first wiring space 271. The crossbeam 120 is provided with a wire-passing hole at the corresponding second wiring space 272 and first wiring space 271. The first wiring space 271, the wire-passing hole, and the second wiring space 272 are on the same straight line. The first control wiring part 2131 and the high-voltage distribution box wiring part 2121 are electrically connected by a wire 250. The wire 250 between the first control wiring part 2131 and the high-voltage distribution box wiring part 2121 is arranged in the first wiring space 271, the second wiring space 272, and the wire-passing hole, so that the wiring between the controller 213 and the high-voltage distribution box 212 is shorter.

[0054] See Figure 3The electric drive bridge 230 has an electric drive wiring section 231, which is located on top of the electric drive bridge 230. The controller 213 is located above the front side of the electric drive bridge 230. A second control wiring section 2132 is provided on the rear side of the controller 213 (i.e., the side near the electric drive wiring section 231). The second control wiring section 2132 is electrically connected to the electric drive wiring section 231 through a wire 250, which makes the wiring between the controller 213 and the electric drive bridge 230 shorter.

[0055] The thermal management device 220 is located behind the controller 213. The power battery 211, high-voltage distribution box 212, controller 213, and thermal management device 220 are arranged sequentially along the front-rear direction of the vehicle frame 100. The cooling pipe 240 between the thermal management device 220 and the power battery 211 passes through the first wiring space 271 and the second wiring space 272, minimizing the length of the cooling pipe 240 and making its arrangement more organized and smoother. This effectively reduces product weight and improves overall assembly efficiency.

[0056] The power battery 211, high-voltage distribution box 212, controller 213 and thermal management device 220 are located in the middle between the two main beams 110, so that the center of the frame 100 and the electric drive system 200 is located in the middle of the semi-trailer, which raises the middle of the semi-trailer, reduces the risk of rollover and improves safety.

[0057] The electric drive system 200 also includes a battery 260, which is used for electrical connection to the controller 213 and provides low-voltage DC power to the controller 213.

[0058] See Figures 1 to 4 In some embodiments, the battery 260 is disposed on the side of the thermal management device 220 away from the electronic control device 210, specifically at the rear of the frame 100, making routine maintenance of the battery 260 more convenient. The battery 260 and the thermal management device 220 are spaced apart, so that the battery 260 does not affect the heat dissipation of the thermal management device 220.

[0059] See Figures 8 to 10 In one embodiment, the battery 260 is disposed between the thermal management device 220 and the controller 213, making the overall structure of the electric drive system 200 more compact and convenient for placement in a smaller electric drive system vehicle model.

[0060] See Figure 11 , Figure 14 and Figure 15The frame 100 also includes support beams 130. A crossbeam 120 is positioned between the two main beams 110, with both ends of the crossbeam 120 fixedly connected to the two main beams 110. Similarly, a support beam 130 is positioned between the two main beams 110, with both ends of the support beam 130 fixedly connected to the main beams 110, thus connecting the two main beams 110 into a single structure via the crossbeam 120 and the support beam 130. The length direction of the main beam 110 aligns with the longitudinal direction of the semi-trailer, and the two main beams 110 are spaced apart along the width direction of the semi-trailer. The length directions of the crossbeam 120 and the support beam 130 are aligned with the width direction of the semi-trailer. The crossbeam 120 and the support beam 130 are distributed along the length direction of the main beam 110, resulting in more even stress distribution on the frame 100 at various locations and improving the stability of the frame 100.

[0061] The crossbeam 120 is vertically arranged, and the support beam 130 is horizontally arranged, with the support beam 130 positioned behind the crossbeam 120. The crossbeam 120 and the support beam 130 enclose an installation space 140 located between the two main beams 110. The installation space 140 is used to install the electronic control device 210 and the thermal management device 220. After the electronic control device 210 and the thermal management device 220 are installed in the installation space 140, the main beam 110 protects the electronic control device 210 and the thermal management device 220 on both sides corresponding to the width of the semi-trailer, the crossbeam 120 protects the front side of the electronic control device 210 and the thermal management device 220, and the support beam 130 protects the lower side of the electronic control device 210 and the thermal management device 220, preventing collisions between the electronic control device 210 and the thermal management device 220 during semi-trailer movement. For example, when a semi-trailer is traveling on a road with poor conditions, it may encounter flying gravel. The structure of the main beam 110, cross beam 120 and support beam 130 of this application can effectively protect the electronic control device 210 and the thermal management device 220, preventing the electronic control device 210 and the thermal management device 220 from being impacted by gravel.

[0062] In some embodiments, the bottom surfaces of the crossbeam 120 and the support beam 130 are higher than the bottom surface of the main beam 110, or the bottom surfaces of the crossbeam 120 and the support beam 130 are on the same plane as the bottom surface of the main beam 110, so that the two sides of the installation space 140 are completely blocked by the two main beams 110, thereby improving the protection effect on the electronic control device 210 and the thermal management device 220.

[0063] See Figure 12, the side rail 110 comprises a web 111, an upper flange 112 arranged on the top surface of the web 111, and a lower flange 113 arranged on the bottom surface of the web 111. The middle part of the upper flange 112 is connected with the web 111, and the middle part of the lower flange 113 is connected with the web 111, so that the upper flange 112, the web 111 and the lower flange 113 form an I-shaped steel structure, which enables the side rail 110 to have relatively high bearing strength. It should be noted that the upper flange 112, the web 111 and the lower flange 113 form a C-shaped steel structure.

[0064] Referring to Figure 14 , in one embodiment, the rear end of the frame 100 is mainly configured to bear the weight of cargo, and the front end of the frame 100 is mainly configured to connect with the tractor head that pulls the semi-trailer. The side rail 110 comprises a first side rail segment 114 and a second side rail segment 115, wherein the first side rail segment 114 is located at the front end of the side rail 110, the second side rail segment 115 is located at the rear end of the side rail 110, and the second side rail segment 115 is connected with the first side rail segment 114. The height dimension of the first side rail segment 114 is smaller than that of the second side rail segment 115, and the top surfaces of the second side rail segment 115 are flush, so that the whole side rail 110 forms a gooseneck structure, thereby reducing the overall weight of the frame 100 while the side rail 110 ensures the capability of bearing the weight of cargo.

[0065] The bottom surface of the first side rail segment 114 and the bottom surface of the second side rail segment 115 are in smooth transition, which prevents stress concentration at the position where the height dimension of the side rail 110 changes, and ensures the bearing strength of the side rail 110.

[0066] In some embodiments, the top surface of the rear end of the side rail 110 (i.e., the second side rail segment 115) is provided with an inclined surface 1151, which inclines backward and downward. The design of the inclined surface 1151 can effectively reduce the drag coefficient when the vehicle is running, especially during high-speed driving, by guiding the air flow to smoothly pass through the rear of the vehicle, thus reducing air resistance. The design of the inclined surface 1151 can also disperse the impact force to a wider area in a rear-end collision, reducing concentrated damage to the rear part of the frame 100. The inclination angle of the inclined surface 1151 is preferably in the range of 10° to 20°. In some embodiments, the inclination angle of the inclined surface 1151 is preferably 15°.

[0067] A cross member 120 and a support beam 130 are arranged on the second side rail segment 115, or arranged on the second side rail segment 115 and the portion of the first side rail segment 114 close to the second side rail segment 115. Since the height dimension of the second side rail segment 115 is relatively large, the installation space 140 enclosed by the cross member 120 and the support beam 130 has a large volume, which facilitates the arrangement of an electric control device 210 and a thermal management device 220.

[0068] Referring to Figure 11 , Figure 14 and Figure 15The crossbeam 120 includes a first crossbeam 121, a second crossbeam 122, and a third crossbeam 123, which are spaced apart along the length (i.e., front-to-back) of the main beam 110. The power battery 211, high-voltage distribution box 212, controller 213, and thermal management device 220 can be distributed between the first crossbeam 121 and the second crossbeam 122, and between the second crossbeam 122 and the third crossbeam 123, so that the two main beams 110 and the first, second, and third crossbeams 121, 122, and 123 provide protection for the power battery 211, high-voltage distribution box 212, controller 213, and thermal management device 220.

[0069] exist Figure 14 In the illustrated embodiment, the first crossbeam 121, the second crossbeam 122, and the third crossbeam 123 are all disposed on the second main beam section 115. Specifically, the first crossbeam 121 is disposed at the front end of the second main beam section 115, the second crossbeam 122 is disposed at the middle end of the second main beam section 115, and the third crossbeam 123 is disposed at the rear end of the second main beam section 115. This disperses the force transmitted through the first crossbeam 121, the second crossbeam 122, and the third crossbeam 123, thereby avoiding stress concentration and deformation of the main beam 110. It should be noted that the positions of the first crossbeam 121, the second crossbeam 122, and the third crossbeam 123 can be adjusted as needed. The power battery 211 and the high-voltage distribution box 212 are installed between the first crossbeam 121 and the second crossbeam 122, and the controller 213 and the thermal management device 220 are installed between the second crossbeam 122 and the third crossbeam 123.

[0070] The first crossbeam 121 is located on the side of the second main beam section 115 near the first main beam section 114. The first crossbeam 121 is vertically arranged, and its two ends are respectively connected to the web plates 111 of the two main beams 110. The bottom surface of the first crossbeam 121 is also connected to the lower flange plate 113 of the main beam 110, which makes the position of the first crossbeam 121 lower, thereby making the first crossbeam 121 provide better protection for the front of the power battery 211 and the high-voltage distribution box 212.

[0071] The first crossbeam 121 has a mounting hole 1211 in the middle of its height direction. The charging interface of the power battery 211 can be installed on the rear side of the first crossbeam 121 and corresponding to the mounting hole 1211, thereby protecting the charging interface of the power battery 211. In addition, the mounting hole 1211 on the first crossbeam 121 reduces the weight of the first crossbeam 121.

[0072] The first crossbeam 121 has folded edges on both the upper and lower sides, which improves the load-bearing strength of the first crossbeam 121.

[0073] The second crossbeam 122 is located in the middle of the second main beam section 115 in the front-rear direction. The second crossbeam 122 is vertically arranged, and its two ends are respectively connected to the web plates 111 of the two main beams 110. The bottom surface of the second crossbeam 122 is also connected to the lower flange plate 113 of the main beam 110, which makes the position of the second crossbeam 122 lower, thereby making the protection effect of the second crossbeam 122 on the front side of the controller 213 and the thermal management device 220 better.

[0074] The second crossbeam 122 is provided with a weight-reducing hole 1221 to reduce its weight. The weight-reducing hole 1221 can also be used for the passage of wires 250 and cooling pipes 240, facilitating the arrangement of lines and pipes between the power battery 211, the high-voltage distribution box 212, the controller 213, and the thermal management device 220. For example, the wires 250 between the high-voltage distribution box 212 and the controller 213 can be passed through the weight-reducing hole 1221, or the cooling pipes 240 between the power battery 211 and the thermal management device 220 can be passed through the weight-reducing hole 1221.

[0075] The second crossbeam 122 has folded edges on both the upper and lower sides, which improves the load-bearing strength of the second crossbeam 122.

[0076] The third crossbeam 123 is located at the rear end of the second main beam section 115. The third crossbeam 123 is located on the upper part of the main beam 110, and the height dimension of the third crossbeam 123 is small, so that the third crossbeam 123 will not block the hot airflow discharged by the thermal management device 220 when dissipating heat.

[0077] In some embodiments, the third crossbeam 123 is disposed at the lower part of the main beam 110, and the height dimension of the third crossbeam 123 is small, so that the third crossbeam 123 will not block the hot airflow discharged when the thermal management device 220 dissipates heat.

[0078] In some embodiments, multiple third crossbeams 123 are provided, with third crossbeams 123 located at both the lower and upper parts of the main beam 110, thereby improving the load-bearing strength of the frame 100. A heat dissipation space is provided between the third crossbeams 123 located at the lower part of the main beam 110 and those located at the upper part of the main beam 110, allowing the hot airflow exhausted by the thermal management device 220 during heat dissipation to be discharged through the heat dissipation space.

[0079] In some embodiments, the top surfaces of the first crossbeam 121, the second crossbeam 122, and the third crossbeam 123 are lower than the top surface of the main beam 110, that is, the top surfaces of the first crossbeam 121, the second crossbeam 122, and the third crossbeam 123 are located below the upper flange 112, so that a wiring channel is formed between the top surfaces of the first crossbeam 121, the second crossbeam 122, and the third crossbeam 123 and the top surface of the main beam 110. The power battery 211, the high-voltage distribution box 212, the controller 213, the thermal management device 220, and the power wires 250 and cooling pipes between the tractor head can be arranged in the wiring channel, thereby facilitating the arrangement of the power wires 250 and cooling pipes.

[0080] When installing the power battery 211, high-voltage distribution box 212, controller 213, and thermal management device 220, these components are installed from above the frame 100 into the installation space 140. Then, the wiring 250 and cooling pipes are arranged above the frame 100, making installation more convenient when the wiring 250 and cooling pipes are routed through the wiring channel. The top surfaces of the first crossbeam 121, second crossbeam 122, and third crossbeam 123 also provide support for the wiring 250 and cooling pipes.

[0081] The support beam 130 includes a battery support beam 131, a controller support beam 132, and a thermal management device support beam 133. The battery support beam 131, the controller support beam 132, and the thermal management device support beam 133 are arranged sequentially along the length of the main beam 110.

[0082] A battery support beam 131 is disposed between the first crossbeam 121 and the second crossbeam 122, with its front end connected to the first crossbeam 121. A space is formed above the battery support beam 131 for mounting the power battery 211, which houses the electronic control device 210 and the thermal management device 220. When the power battery 211 is mounted on the battery support beam 131, the first crossbeam 121 protects the front of the power battery 211, and the battery support beam 131 protects the bottom of the power battery 211, preventing impact from flying debris.

[0083] The battery support beam 131 is horizontally arranged and located at the lower part of the web plate 111, so that there is a large space above the battery support beam 131 for installing the power battery 211 for the electronic control device 210 and the thermal management device 220. Moreover, the area of ​​the battery support beam 131 that protects the power battery 211 is larger and the protection effect is better.

[0084] See Figure 16In some embodiments, the battery support beam 131 includes multiple connecting beams 1311 and a first protective plate 1312. The multiple connecting beams 1311 are spaced apart in the horizontal direction, and both ends of the connecting beams 1311 are fixedly connected to the two main beams 110. Specifically, the connecting beams 1311 can be fixedly connected to the web plate 111 or the lower flange plate 113 of the main beam 110. Figure 16 In the illustrated embodiment, the connecting beam 1311 includes a first support portion and first reinforcing portions connected to both sides of the first support portion. The two first reinforcing portions and the first support portion form an approximately "U"-shaped structure, thereby increasing the stress resistance of the connecting beam 1311. In some embodiments, the side of the first reinforcing portion away from the first support portion is further provided with a folded edge, thereby further increasing the stress resistance of the connecting beam 1311.

[0085] The first protective plate 1312 is disposed between two adjacent connecting beams 1311. The two sides of the first protective plate 1312 along its length are connected to the two adjacent connecting beams 1311, and the two sides of the first protective plate 1312 along its width are fixedly connected to the two large beams 110 respectively. This allows the first protective plate 1312 and the connecting beams 1311 to work together to completely cover the bottom surface of the power battery 211, preventing flying gravel from impacting the power battery 211. Furthermore, the interconnection between the first protective plate 1312 and the connecting beams 1311 improves the load-bearing strength of the battery support beam 131.

[0086] In some embodiments, the first protective plate 1312 is a plate structure, which not only protects the power battery 211, but also reduces the weight of the battery support beam 131, thereby reducing the overall weight of the vehicle frame 100.

[0087] In some embodiments, the first protective plate 1312 is corrugated, which increases the stress strength of the first protective plate 1312, thereby increasing the stress strength of the battery support beam 131.

[0088] The first protective plate 1312 is positioned below the top surface of the connecting beam 1311, and a drain outlet 13121 is provided at the lowest point of the first protective plate 1312. When the battery leaks liquid, or when water droplets fall on the outer surface of the power battery 211, the liquid can converge at the first protective plate 1312 and be discharged from the drain outlet 13121.

[0089] The position of the drain outlet 13121 on the first protective plate 1312 is higher than the bottom surface of the connecting beam 1311, and the drain outlet 13121 is located on the first protective plate 1312 near the front of the connecting beam 1311, so that the first protective plate 1312 can prevent flying gravel from entering the power battery 211 from the drain outlet 13121.

[0090] In some embodiments, the battery support beam 131 further includes a second protective plate 1313. In this embodiment, the connecting beam 1311 is spaced apart from the first crossbeam 121, and the two ends of the second protective plate 1313 in the longitudinal direction are respectively connected to the first crossbeam 121 and the connecting beam 1311 near the first crossbeam 121. The second protective plate 1313 is a plate structure, and the connection between the connecting beam 1311 and the first crossbeam 121 is achieved through the second protective plate 1313, which can increase the protection area of ​​the power battery 211 and reduce the overall weight of the frame 100. It should be noted that the connecting beam 1311 can also be set close to the first crossbeam 121, so that the second protective plate 1313 is not required between the connecting beam 1311 and the first crossbeam 121.

[0091] See Figure 14 The controller support beam 132 is located behind the second crossbeam 122. Above the controller support beam 132, a space is formed for installing the controller 213 of the electronic control device 210 and the thermal management device 220. After the controller 213 is installed on the controller support beam 132, the second crossbeam 122 protects the front of the controller 213, and the controller support beam 132 protects the bottom of the controller 213.

[0092] exist Figure 14 In the embodiment shown, the controller support beam 132 includes a first support beam 1321 and a second support beam 1322. The first support beam 1321 and the second support beam 1322 are spaced apart in the horizontal direction, so that the first support beam 1321 and the second support beam 1322 can support the front and rear ends of the bottom of the controller 213 respectively, and the position of the support beam 130 is distributed, thereby improving the stress strength of the frame 100.

[0093] In some embodiments, the first support beam 1321 is disposed on one side near the second crossbeam 122, and the first support beam 1321 is fixedly connected to the rear side of the second crossbeam 122, thereby enabling the first support beam 1321 to strengthen the second crossbeam 122 and improve the stress strength of the second crossbeam 122.

[0094] exist Figure 14 In the embodiment shown, the first support beam 1321 includes a second support portion and a second reinforcing portion connected to the side of the second support portion away from the second crossbeam 122. The side of the second support portion near the second crossbeam 122 is fixedly connected to the second crossbeam 122, so that the first support beam 1321 and the second crossbeam 122 support each other, thereby improving the stress strength of the first support beam 1321 and the second crossbeam 122, and the structure is simple and the weight is reduced.

[0095] The structure of the second support beam 1322 is the same as that of the connecting beam 1311. That is, the second support beam 1322 includes a third support part and a third reinforcing part connected to both sides of the third support part. The two third reinforcing parts and the third support part form an approximately "U" shaped structure, thereby increasing the stress strength of the second support beam 1322.

[0096] The thermal management device support beam 133 is located behind the controller support beam 132. The space above the thermal management device support beam 133 is used to create space for mounting the thermal management device 220 (both the electronic control device 210 and the thermal management device 220). After the thermal management device 220 is mounted on the thermal management device support beam 133, its location behind the controller 213 ensures that the heat dissipated by the thermal management device 220 does not affect the controller 213 or the power battery 211.

[0097] The thermal management device support beam 133 includes a support plate 1331, which is horizontally arranged so that the thermal management device support beam 133 can better support the thermal management device 220.

[0098] In some embodiments, the thermal management device support beam 133 further includes a reinforcing rod 1332, which is disposed on the bottom surface of the support plate 1331 to increase the stress strength of the support plate 1331.

[0099] In one embodiment, the third crossbeam 123 is disposed on the upper part of the main beam 110. The thermal management device support beam 133 is disposed close to the third crossbeam 123 and located on the lower part of the main beam 110, so that the thermal management device support beam 133 and the third crossbeam 123 respectively support the upper and lower sides of the main beam 110, thereby balancing the forces on the main beam 110 at the thermal management device support beam 133 and the third crossbeam 123. Moreover, disposing of the third crossbeam 123 on the upper part of the main beam 110 can also prevent the third crossbeam 123 from blocking the hot airflow discharged when the thermal management device 220 dissipates heat.

[0100] The thermal management device support beam 133 and the controller support beam 132 are spaced apart in the horizontal direction, so that the space between the thermal management device support beam 133 and the controller support beam 132 can allow the airflow entering the thermal management device 220 for heat exchange to pass through, and can also provide operating space when wiring the controller 213.

[0101] The support beam 130 also includes a battery support beam 134, above which a space is formed for mounting the battery 260 of the electronic control device 210 and the thermal management device 220. The battery 260 is mounted on the battery support beam 134. The battery support beam 134 is positioned between the thermal management device support beam 133 and the controller support beam 132. The battery 260 is relatively small, so positioning it between the controller 213 and the thermal management device 220 does not obstruct the airflow into the thermal management device 220 for heat exchange, nor does it hinder wiring operations for the controller 213, and also makes the overall structure more compact. It should be noted that the battery support beam 134 can also be positioned near the rear end of the main beam 110, i.e., the battery 260 can be mounted near the rear end of the main beam 110, facilitating routine maintenance of the battery 260.

[0102] In one embodiment, the battery support beam 134 includes a third support beam 1341 and a fourth support beam 1342, which are spaced apart horizontally. The two ends of the battery 260 in the front-rear direction are respectively connected to the third support beam 1341 and the fourth support beam 1342.

[0103] The frame 100 also includes a high-voltage distribution box support beam 150, which is disposed between the two main beams 110 and connected to the crossbeam 120. Above the high-voltage distribution box support beam 150, a space is formed for installing a high-voltage distribution box 212 for mounting an electronic control device 210 and a thermal management device 220.

[0104] exist Figure 14 In the illustrated embodiment, the high-voltage distribution box support beam 150 is located behind the battery support beam 131 and fixed to the second crossbeam 122. The high-voltage distribution box support beam 150 and the battery support beam 131 are spaced apart along the length of the main beam 110, with the high-voltage distribution box support beam 150 positioned higher than the battery support beam 131, creating an operating space between them for wiring the power battery 211. It should be noted that the high-voltage distribution box support beam 150 can also be connected to the main beam 110.

[0105] In some embodiments, the frame 100 further includes a traction disc crossbeam 160, which is disposed at the front end of the main beam 110, i.e., connected to the first main beam section 114, to improve the stress strength at the first main beam section 114. The traction disc crossbeam 160 is provided with a pivot for connecting to a tractor unit, so that the frame 100 is mounted on the tractor unit.

[0106] In some embodiments, the frame 100 further includes a rear end beam 170, which is disposed at the rear end of the main beam 110. The rear end beam 170 can serve as a mounting bracket for the rear end of a semi-trailer.

[0107] In one embodiment, the stress strength of the tail end beam 170 is less than that of the main beam 110, the cross beam 120 and the support beam 130, so that when the semi-trailer is rear-ended, the tail end beam 170 will break first to absorb the impact force and reduce the degree of damage.

[0108] Multiple spring supports 180 are provided below the main beam 110. Specifically, the spring supports 180 are mounted on the second main beam section 115. The multiple spring supports 180 are spaced apart along the length of the main beam 110, and are used to connect the shock-absorbing springs of the wheels. Figure 6 In the embodiment shown, there are four spring supports 180. The four spring supports 180 are arranged sequentially from the front end to the rear end of the main beam 110 as the first spring support 181, the second spring support 182, the third spring support 183 and the fourth spring support 184.

[0109] The positions of the first spring bracket 181, the second spring bracket 182, and the third spring bracket 183 correspond one-to-one with the positions of the battery support beam 131, the second crossbeam 122, and the thermal management device support beam 133, respectively. The frame 100 also includes multiple diagonal braces 190, which are correspondingly arranged with the multiple spring brackets 180, and the diagonal braces 190 are connected to the spring brackets 180 to support the spring brackets 180. Figure 6 In the illustrated embodiment, there are a first diagonal brace 191, a second diagonal brace 192, and a third diagonal brace 193. One end of the first diagonal brace 191 is connected to the first spring bracket 181, and the other end is connected to the battery support beam 131, enabling the first diagonal brace 191 to support the first spring bracket 181 and improve the structural stability of the first spring bracket 181. One end of the second diagonal brace 192 is connected to the second spring bracket 182, and the other end is connected to the second crossbeam 122, enabling the second diagonal brace 192 to support the second spring bracket 182 and improve the structural stability of the second spring bracket 182. One end of the third diagonal brace 193 is connected to the third spring bracket 183, and the other end is connected to the thermal management device support beam 133, enabling the third diagonal brace 193 to support the third spring bracket 183 and improve the structural stability of the third spring bracket 183.

[0110] The spring bracket 180 and the diagonal brace 190 can also prevent flying gravel from entering the installation space 140 from below the main beam 110, thereby preventing flying gravel from hitting the electronic control device 210 and the thermal management device 220.

[0111] See Figure 11 and Figure 17In one embodiment, the front top surface of the main beam 110 is provided with a first connecting hole 1121, which is specifically located on the upper wing plate 112. The first connecting hole 1121 is used for detachable connection with the front end 101. The rear top surface of the main beam 110 is provided with a second connecting hole 1122, which is specifically located on the upper wing plate 112. The second connecting hole 1122 is used for detachable connection with the rear end 102. The frame 100 can be used as a mixer truck frame 100, meaning that after the front end 101 and the rear end 102 are connected to the frame 100, a mixer truck frame 100 is formed. The front end 101 and the rear end 102 are used to support the mixing drum of the mixer semi-trailer. When the front end 101 and the rear end 102 are not installed, the chassis 100 can be used as a transport chassis 100 (such as the chassis 100 of a rear-tipping dump semi-trailer), realizing the uniformity of the chassis 100 platform design, reducing design and manufacturing costs, and significantly improving production efficiency and parts commonality, giving full play to the advantages of large-scale development and manufacturing.

[0112] In some embodiments, the traction disc crossbeam 160 and the third crossbeam 123 are also provided with connection holes. The connection holes on the traction disc crossbeam 160 are used to connect with the front end 101 to improve the connection strength of the front end 101. The connection holes on the third crossbeam 123 are used to connect with the back end 102 to improve the connection strength of the back end 102.

[0113] The semi-trailer of this application includes a frame 100 and an electric drive system 200. The frame 100 includes two main beams 110 spaced apart. The electric drive system 200 includes an electronic control device 210 and a thermal management device 220, which are positioned between the two main beams 110. This allows the frame 100 to protect the electronic control device 210 and the thermal management device 220, preventing them from malfunctioning due to collisions with flying gravel or other debris when the semi-trailer is traveling on rough roads. The electronic control device 210 and the thermal management device 220 are distributed along the front-rear direction of the frame 100, with the thermal management device 220 positioned behind the electronic control device 210. This allows the hot airflow from the thermal management device 220 to be directly discharged from the rear of the semi-trailer, preventing the hot airflow from the thermal management device 220 from directly blowing onto the electronic control device 210 and causing a decrease in system performance.

[0114] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A semi-trailer, characterized in that, include: The frame consists of two main beams, which are spaced apart. An electric drive system includes an electronic control device and a thermal management device, both of which are disposed between the two main beams, with the thermal management device located behind the electronic control device.

2. The semi-trailer according to claim 1, characterized in that, There is a gap between the thermal management device and the electronic control device, and the gap allows airflow to pass through to dissipate heat from the thermal management device.

3. The semi-trailer according to claim 1, characterized in that, The thermal management device includes a heat exchanger and a fan, which are distributed along the front-rear direction of the vehicle frame. When the fan is working, it drives the airflow passing through the heat exchanger to flow away from the electronic control device.

4. The semi-trailer according to claim 1, characterized in that, The electronic control device includes a power battery, a high-voltage distribution box, and a controller. The power battery, the high-voltage distribution box, and the controller are arranged sequentially along the front and rear direction of the vehicle frame. The high-voltage distribution box is electrically connected to the power battery and the controller via wires. The thermal management device is connected to the heat exchange channel of the power battery via a cooling pipe.

5. The semi-trailer according to claim 4, characterized in that, The power battery has a battery terminal, which is located on the side of the power battery closer to the high-voltage distribution box; There is a wiring gap between the power battery and the high-voltage distribution box, which can be used to connect the wires and the cooling pipes to the power battery.

6. The semi-trailer according to claim 4, characterized in that, There is a distance between the side of the high-voltage distribution box and the main beam. The gap between the side of the high-voltage distribution box and the main beam forms a first wiring space. The high-voltage distribution box has a high-voltage distribution box wiring part, which is located on the side of the high-voltage distribution box closer to the first wiring space. There is a distance between the side of the controller and the main beam, and the gap between the side of the controller and the main beam forms a second wiring space. The position of the second wiring space corresponds to the position of the first wiring space. The controller has a first control wiring part, which is located on the side of the controller closer to the second wiring space. The first control wiring section and the high-voltage distribution box wiring section are electrically connected by wires, and the wires between the first control wiring section and the high-voltage distribution box wiring section are arranged in the first wire passage space and the second wire passage space.

7. The semi-trailer according to claim 6, characterized in that, The controller is located on a side close to the thermal management device; The cooling pipe between the thermal management device and the power battery passes through the first wiring space and the second wiring space.

8. The semi-trailer according to claim 4, characterized in that, The electric drive system also includes an electric drive bridge, which is disposed below the main beam and is electrically connected to the controller. The electric drive bridge is connected to the thermal management device via a cooling pipe.

9. The semi-trailer according to claim 8, characterized in that, The electric drive bridge has an electric drive wiring section, which is located at the top of the electric drive bridge; The controller has a second control wiring section on its rear side, which is electrically connected to the electric drive wiring section.

10. The semi-trailer according to claim 1, characterized in that, The electric drive system also includes a battery; The battery is disposed on the side of the thermal management device away from the electronic control device, and the battery and the thermal management device are disposed at a distance; or, the battery is disposed between the thermal management device and the electronic control device.

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