A vehicle-mounted host

Abstract

This utility model relates to a vehicle-mounted main unit, including a middle frame, a front cover and a bottom cover respectively fastened to both sides of the middle frame in the height direction, a first circuit board disposed between the middle frame and the front cover, and a second circuit board disposed between the middle frame and the bottom cover. The front cover has a clamping plate for pressing and fixing the first circuit board to the middle frame, and the bottom cover has a clamping protrusion for pressing and fixing the second circuit board to the middle frame. The front cover, the first circuit board, the middle frame, the second circuit board, and the bottom cover are fastened together into an integrated structure by through-type fasteners. The vehicle-mounted main unit designed in this utility model, through structural optimization, reduces the number of screws used, shortens the process cycle, and improves assembly efficiency.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and in particular to an in-vehicle host. Background Technology

[0002] The in-vehicle head unit is an indispensable component of automobiles, providing various functions such as radio, navigation, and video decoding. Currently, the structure of an in-vehicle head unit includes a mid-frame, bottom cover, top cover, and several PCB boards. The PCB boards are mounted on the mid-frame and secured with screws. The bottom and top covers fit over the top and bottom sides of the mid-frame, respectively, enclosing the PCB boards, and are then secured together with screws to form a single unit. This structure results in a large number of screws being used, requiring numerous screws during assembly. This screw-in process is time-consuming, leading to low assembly efficiency and impacting production output. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this utility model is to design a vehicle-mounted host that, through structural optimization, reduces the number of screws used, lowers the cycle time, and improves assembly efficiency.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] Design a vehicle-mounted host, including a middle frame, a front cover and a bottom cover respectively fastened to both sides of the middle frame in the height direction, a first circuit board is provided between the middle frame and the front cover, a second circuit board is provided between the middle frame and the bottom cover, the front cover is provided with a clamping plate for pressing and fixing the first circuit board to the middle frame, and the bottom cover is provided with a clamping protrusion for pressing and fixing the second circuit board to the middle frame. The front cover, the first circuit board, the middle frame, the second circuit board and the bottom cover are locked together into an integral structure by through fasteners.

[0006] In this solution, the middle frame can be made by integral die casting technology, using aluminum alloy die casting or magnesium-aluminum alloy die casting. It not only provides support but also has high thermal conductivity, which is conducive to rapid heat dissipation. The first circuit board and the second circuit board are located on both sides of the middle frame, which realizes the physical isolation of functional modules, avoids signal interference, and facilitates individual repair or replacement of a circuit board. During assembly, the clamping plate of the front cover and the clamping protrusion of the bottom cover pre-fix the first and second circuit boards through mechanical pressure, and then lock them together in one go using through fasteners, integrating the structure into a rigid whole and reducing assembly steps. Specifically, firstly, the first circuit board is assembled to the corresponding position of the middle frame, and then the front cover is fastened to the middle frame. After the front cover is assembled to the middle frame, the clamping plate on the side of the front cover facing the first circuit board contacts the edge of the first circuit board or the position without electronic components, pressing the first circuit board onto the middle frame to prevent it from moving. Then, in the same way, the second circuit board is assembled to the corresponding position of the middle frame, and then the bottom cover is fastened to the middle frame. After the bottom cover is assembled to the middle frame, the clamping protrusion on the side of the bottom cover facing the second circuit board contacts the position of the second circuit board without electronic components, pressing the second circuit board onto the middle frame to prevent it from moving. Finally, the front cover, the first circuit board, the middle frame, the second circuit board, and the bottom cover are locked into a single structure using through fasteners. By optimizing the structure of the vehicle-mounted host, a through-type fastener is used for integrated fastening, replacing the separate fastening of each component. This reduces the number of fasteners used, shortens the cycle time, and improves the assembly efficiency of the vehicle-mounted host.

[0007] Furthermore, the bottom cover is provided with a first fastening hole, the middle frame is provided with a third fastening hole, the top cover is provided with a fifth fastening hole, and the fastener is a through screw, which passes through the first fastening hole and the third fastening hole in sequence and is locked in the fifth fastening hole.

[0008] Through-type screws pass sequentially through the bottom cover, the second circuit board, the middle frame, and the first circuit board, and are finally locked to the top cover, forming a rigid connection at all levels. All fastening holes are coaxially aligned. During assembly, only the screws need to be inserted in sequence without any additional adjustments. This allows for better adaptation to automated production lines and facilitates fully automated assembly.

[0009] Furthermore, the cover includes a panel and a first side panel surrounding the panel, the first side panel having snap holes, and the side wall of the middle frame having snaps that engage with the snap holes.

[0010] The buckles are set on the opposite side walls of the middle frame. Through the buckle holes and the cooperation of the buckles, the front cover and the middle frame can be quickly and initially assembled, so that the front cover and the middle frame become one piece. At the same time, the first circuit board is pre-fixed by the clamping plate. When flipping and assembling the second circuit board and the bottom cover on the other side of the middle frame, the displacement of the front cover and the first circuit board can be effectively avoided.

[0011] Furthermore, the first side plate is provided with a first positioning groove, the panel is provided with a first positioning hole, and the middle frame is provided with a first positioning protrusion corresponding to the first positioning groove and a first positioning post corresponding to the first positioning hole.

[0012] To achieve high-precision assembly and improve assembly efficiency during the assembly of the faceplate, a double-positioning structure is designed, consisting of a first positioning groove and a first positioning protrusion, a first positioning hole and a first positioning post. The first positioning groove and the first positioning protrusion provide lateral horizontal positioning to prevent the faceplate from shifting left or right relative to the middle frame; the first positioning hole and the first positioning post provide vertical positioning to ensure the parallelism between the panel and the middle frame and prevent the faceplate from being assembled crookedly.

[0013] Furthermore, the middle frame has a first mounting area on the side facing the face cover, the first circuit board is located in the first mounting area, and the first mounting area has a second positioning post for positioning the first circuit board.

[0014] The first installation area is provided with several support platforms, and at least two support platforms are provided with second positioning posts on their sides. The first circuit board is assembled onto the support platform and is positioned by the second positioning posts.

[0015] Furthermore, a heat dissipation protrusion is provided on the side of the middle frame facing the second circuit board, and the second circuit board is in contact with the heat dissipation protrusion.

[0016] Heat dissipation bosses are provided at the locations of components that generate significant heat on the middle frame and the second circuit board. The heat dissipation bosses are in direct contact with the components, thereby improving the heat dissipation efficiency of the components. In addition, thermally conductive materials can be coated on the heat dissipation bosses to further improve the heat transfer efficiency between the heat dissipation bosses and the components.

[0017] Furthermore, heat dissipation fins are provided on the side of the first installation area.

[0018] The heat generated by the components on the second circuit board is conducted to the middle frame through the heat dissipation protrusions. The heat dissipation area is increased by setting heat dissipation fins, and the channels between the fins facilitate airflow, which can quickly dissipate heat and improve the heat dissipation efficiency of the middle frame, thus helping to achieve rapid cooling of the components on the second circuit board.

[0019] Furthermore, the edge of the second circuit board is provided with a positioning protrusion, the middle frame is provided with a third positioning groove at the position corresponding to the positioning protrusion, and a third positioning post for positioning the second circuit board is provided next to the heat dissipation boss.

[0020] To improve the accuracy and efficiency of the second circuit board assembly, a double positioning structure to prevent errors is designed, consisting of a positioning protrusion, a third positioning groove, a through hole in the second circuit board, and a third positioning post. The positioning protrusion is embedded in the third positioning groove to eliminate the risk of lateral displacement of the circuit board; the through hole in the second circuit board cooperates with the third positioning post to achieve vertical positioning and prevent the second circuit board from tilting.

[0021] Furthermore, the bottom cover includes a bottom plate and a second side plate surrounding the bottom plate. The second side plate is provided with a second positioning groove, and the middle frame is provided with a second positioning protrusion corresponding to the second positioning groove.

[0022] When the bottom cover is assembled, the bottom cover is fastened to the middle frame, and the second positioning protrusion is embedded in the second positioning groove. The second positioning groove and the second positioning protrusion cooperate to form a rigid constraint in the horizontal direction, ensuring that the first fastening hole is coaxial with other fastening holes.

[0023] Furthermore, the fastener is a bolt integrally formed with the bottom cover, the middle frame is provided with a third fastening hole, the top cover is provided with a fifth fastening hole, and the bolt passes through the third fastening hole and the fifth fastening hole in sequence and is locked to the top cover by a nut.

[0024] In this design, the bolts and the bottom cover can be die-cast as a single unit, which reduces the need for inserting screws during assembly compared to separate screws, thus improving assembly efficiency.

[0025] Compared with the prior art, the beneficial effects of this utility model are:

[0026] In this solution, the middle frame can be made by integral die casting technology, using aluminum alloy die casting or magnesium-aluminum alloy die casting. It not only provides support but also has high thermal conductivity, which is conducive to rapid heat dissipation. The first circuit board and the second circuit board are located on both sides of the middle frame, which realizes the physical isolation of functional modules, avoids signal interference, and facilitates individual repair or replacement of a circuit board. During assembly, the clamping plate of the front cover and the clamping protrusion of the bottom cover pre-fix the first and second circuit boards through mechanical pressure, and then lock them together in one go using through fasteners, integrating the structure into a rigid whole and reducing assembly steps. Specifically, firstly, the first circuit board is assembled to the corresponding position of the middle frame, and then the front cover is fastened to the middle frame. After the front cover is assembled to the middle frame, the clamping plate on the side of the front cover facing the first circuit board contacts the edge of the first circuit board or the position without electronic components, pressing the first circuit board onto the middle frame to prevent it from moving. Then, in the same way, the second circuit board is assembled to the corresponding position of the middle frame, and then the bottom cover is fastened to the middle frame. After the bottom cover is assembled to the middle frame, the clamping protrusion on the side of the bottom cover facing the second circuit board contacts the position of the second circuit board without electronic components, pressing the second circuit board onto the middle frame to prevent it from moving. Finally, the front cover, the first circuit board, the middle frame, the second circuit board, and the bottom cover are locked into a single structure using through fasteners. By optimizing the structure of the vehicle-mounted host, a through-type fastener is used for integrated fastening, replacing the separate fastening of each component. This reduces the number of fasteners used, shortens the cycle time, and improves the assembly efficiency of the vehicle-mounted host. Attached Figure Description

[0027] Figure 1 This is an exploded view of the structure of a vehicle-mounted host according to an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of the frame structure in one embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram of the structure of the face cover according to an embodiment of the present invention.

[0030] Figure 4 This is a schematic diagram of the structure on the other side of the frame in one embodiment of the present invention.

[0031] Figure 5 This is a schematic diagram of the bottom cover of one embodiment of the present invention.

[0032] Illustration: 1. Middle frame; 11. Third fastening hole; 12. Buckle; 13. First positioning protrusion; 14. First positioning post; 15. First mounting area; 151. Second positioning post; 16. Heat dissipation boss; 17. Heat dissipation fins; 18. Third positioning groove; 19. Third positioning post; 110. Second positioning protrusion; 2. Face cover; 21. Pressure plate; 22. Fifth fastening hole; 23. Front panel; 231. First positioning hole; 24. First side panel; 241. Buckle hole; 242. First positioning groove; 3. Bottom cover; 31. Pressure protrusion; 32. First fastening hole; 33. Bottom plate; 34. Second side panel; 341. Second positioning groove; 4. First circuit board; 41. Fourth fastening hole; 5. Second circuit board; 51. Second fastening hole; 52. Positioning protrusion; 6. Fastener. Detailed Implementation

[0033] To facilitate understanding of this invention, a more comprehensive description will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the invention. However, this invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0034] like Figure 1 As shown, this embodiment provides a vehicle-mounted host, including a middle frame 1, a front cover 2 and a bottom cover 3 respectively fastened to both sides of the middle frame 1 in the height direction. Exemplarily, the middle frame 1, the front cover 2 and the bottom cover 3 are structurally compatible and are all rectangular. A first circuit board 4 is provided between the middle frame 1 and the front cover 2, and a second circuit board 5 is provided between the middle frame 1 and the bottom cover 3. The front cover 2 is provided with a pressing plate 21 for pressing and fixing the first circuit board 4 to the middle frame 1, and the bottom cover 3 is provided with a pressing protrusion 31 for pressing and fixing the second circuit board 5 to the middle frame 1. The front cover 2, the first circuit board 4, the middle frame 1, the second circuit board 5 and the bottom cover 3 are locked together into an integral structure by through fasteners 6. In this embodiment, the bottom cover 3 has a first fastening hole 32, the second circuit board 5 has a second fastening hole 51, the middle frame 1 has a third fastening hole 11, the first circuit board 4 has a fourth fastening hole 41, and the top cover 2 has a fifth fastening hole 22. The fastener 6 is a through-type screw, which passes through the first fastening hole 32, the second fastening hole 51, the third fastening hole 11, and the fourth fastening hole 41 in sequence, and is locked to the fifth fastening hole 22. By having the through-type screw pass through the bottom cover 3, the second circuit board 5, the middle frame 1, and the first circuit board 4 in sequence, and finally lock to the top cover 2, a rigid connection at all levels is formed. All fastening holes are coaxially aligned, and during assembly, only the screws need to be inserted in sequence without additional adjustment, which can better adapt to automated production lines and facilitate fully automated assembly. For example, in this embodiment, the number of screws is set to five. In other embodiments, the number of screws is adapted to the structure and size of the vehicle host.

[0035] It should be noted that the first circuit board 4 and the second circuit board 5 may not have or may have fewer fourth fastening holes 41 and 51. The placement of the fourth fastening holes 41 and 51 is related to the size and shape of the first circuit board 4 and the second circuit board 5. If the screws can avoid the first circuit board 4 and the second circuit board 5, then the first circuit board 4 and the second circuit board 5 may not have the fourth fastening holes 41 and 51. The first circuit board 4 is pressed and fixed to the middle frame 1 by the clamping plate 21, thus restricting its movement; the second circuit board 5 is pressed and fixed to the middle frame 1 by the clamping protrusion 31, thus restricting its movement.

[0036] In another embodiment, the fastener 6 can be a bolt integrally formed with the bottom cover 3. During assembly, the bolt passes sequentially through the second fastening hole 51, the third fastening hole 11, the fourth fastening hole 41, and the fifth fastening hole 22, and is secured to the top cover 2 by a nut. The bolt and the bottom cover 3 can be die-cast as a single unit, which reduces the need for inserting screws during assembly compared to separate screws, further improving assembly efficiency.

[0037] like Figure 2 As shown, the middle frame 1 has a first mounting area 15 on the side facing the cover 2. The first mounting area 15 is provided with several support platforms. At least two support platforms are provided with second positioning posts 151 on their sides. The first circuit board 4 is assembled onto the support platform and is positioned by the second positioning posts 151 to ensure the coaxiality of the fourth fastening hole 41 with other fastening holes.

[0038] like Figure 3As shown, the cover 2 includes a panel 23 and a first side plate 24 surrounding the panel 23. The first side plate 24 has snap-fit ​​holes 241, and the side wall of the middle frame 1 has snap-fit ​​holes 12 that cooperate with the snap-fit ​​holes 241. The snap-fit ​​holes 12 are set on the opposite side walls of the middle frame, with two snap-fit ​​holes 12 spaced apart on each side wall. Through the cooperation of the snap-fit ​​holes 241 and snap-fit ​​holes 12, the cover 2 and the middle frame 1 can be quickly and initially assembled, making the cover 2 and the middle frame 1 an integral unit. The first side plate 24 has a first positioning groove 242, the panel has a first positioning hole 231, and the middle frame 1 has a first positioning protrusion 13 corresponding to the first positioning groove 242 and a first positioning post 14 corresponding to the first positioning hole 231. To achieve high-precision assembly and improve assembly efficiency during the assembly of the faceplate 2, a double-positioning structure is designed, consisting of a first positioning groove 242, a first positioning protrusion 13, a first positioning hole 231, and a first positioning post 14. Two sets of the first positioning groove 242 and the first positioning protrusion 13 are provided, while one set of the first positioning hole 231 and the first positioning post 14 is provided. The first positioning groove 242 and the first positioning protrusion 13 provide lateral horizontal positioning to prevent the faceplate 2 from shifting left or right relative to the middle frame 1; the first positioning hole 231 and the first positioning post 14 provide vertical positioning to ensure the parallelism between the panel 23 and the middle frame 1, preventing the faceplate 2 from being misaligned during assembly and ensuring the coaxiality of the fifth fastening hole 22 with the other fastening holes. Panel 23 is provided with a clamping plate 21 for pressing and fixing the first circuit board 4 onto the middle frame 1. The bottom of the clamping plate 21 is provided with pressure plates at intervals. The edge of the pressure plates can abut against the edge of the first circuit board 4 where there are no electronic components. After the face cover 2 and the middle frame 1 are fastened together, the first circuit board 4 is pre-fixed by the clamping plate 21. When flipping and assembling the second circuit board 5 and the bottom cover 3 on the other side of the middle frame, the displacement of the face cover 2 and the first circuit board 4 can be effectively prevented.

[0039] like Figure 4 As shown, heat dissipation protrusions 16 are provided at the positions corresponding to the components with high heat generation on the middle frame 1 and the second circuit board 5. The heat dissipation protrusions 16 are in direct contact with the components, thereby improving the heat dissipation efficiency of the components. In addition, thermally conductive material can be coated on the heat dissipation protrusions 16 to further improve the heat transfer efficiency between the heat dissipation protrusions 16 and the components. In addition, heat dissipation fins 17 are provided on the side of the first mounting area 15. The heat generated by the components on the second circuit board 5 is conducted to the middle frame 1 through the heat dissipation protrusions 16. By setting the heat dissipation fins 17, the heat dissipation area is increased, and the channels between the fins facilitate airflow, which can quickly dissipate the heat and improve the heat dissipation efficiency of the middle frame 1, which is conducive to the rapid cooling of the components on the second circuit board 5. To further enhance the heat dissipation effect, the heat dissipation fins 17 can be provided with a second mounting area. The second mounting area can be equipped with a cooling fan to accelerate the airflow. The cooling fan can be fixed to the middle frame 1 in the same way as the first circuit board 4, that is, by pressing it with the cover 2, or by screwing it.

[0040] like Figure 1 As shown, the edge of the second circuit board 5 is provided with a positioning protrusion 52, and the middle frame 1 is provided with a third positioning groove 18 at the position corresponding to the positioning protrusion 52. A third positioning post 19 for positioning the second circuit board 5 is provided on the side of the heat dissipation boss 16. In order to improve the assembly accuracy and efficiency of the second circuit board 5, a double positioning structure for preventing errors is designed, consisting of the positioning protrusion 52 and the third positioning groove 18, and the through hole of the second circuit board 5 and the third positioning post 19. The positioning protrusion 52 is embedded in the third positioning groove 18 to eliminate the risk of lateral displacement of the circuit board; the through hole of the second circuit board 5 cooperates with the third positioning post 19 to achieve vertical positioning and avoid the second circuit board 5 from being skewed. Through the double positioning structure, the coaxiality of the second fastening hole 51 and the third fastening hole 11 can be guaranteed. In addition, in order to prevent wear on the positioning protrusion 52, a protective sleeve can be fitted on the positioning protrusion 52 to prevent wear.

[0041] like Figure 5 As shown, the bottom cover 3 includes a bottom plate 33 and a second side plate 34 surrounding the bottom plate 33. The second side plate 34 is provided with a second positioning groove 341, and the middle frame 1 is provided with a second positioning protrusion 110 corresponding to the second positioning groove 341. The bottom plate 33 is provided with a pressing protrusion 31 on the side facing the second circuit board 5 for pressing and fixing the second circuit board 5 onto the middle frame 1. When the bottom cover 3 is assembled, the bottom cover 3 is fastened to the middle frame 1, and the pressing protrusion 31 contacts the part of the second circuit board 5 without electronic components, pressing the second circuit board 5 onto the middle frame 1 to prevent the second circuit board 5 from moving. The second positioning protrusion 110 is embedded in the second positioning groove 341. The second positioning groove 341 and the second positioning protrusion 110 cooperate to form a horizontal rigid constraint to ensure that the first fastening hole 32 is coaxial with other fastening holes. Two sets of second positioning protrusions 110 and second positioning grooves 341 are provided. The second positioning protrusions 110 and the first positioning protrusion 13 are located at opposite positions on the side wall of the middle frame, and the two are connected to form a reinforcing structure.

[0042] In this embodiment, the middle frame 1 can be manufactured using integrated die-casting technology. An aluminum alloy die-cast middle frame or a magnesium-aluminum alloy die-cast middle frame not only provides support but also has high thermal conductivity, facilitating rapid heat dissipation. The first circuit board 4 and the second circuit board 5 are located on opposite sides of the middle frame 1, achieving physical isolation of functional modules, avoiding signal interference, and facilitating individual repair or replacement of a single circuit board. During assembly, the clamping plate 21 of the face cover 2 and the clamping protrusion 31 of the bottom cover 3 achieve pre-fixation of the first circuit board 4 and the second circuit board 5 through mechanical pressure. Then, they are locked in one go by through fasteners 6, integrating the structure into a rigid whole and reducing assembly steps. Specifically, firstly, the first circuit board 4 is assembled to the corresponding position on the middle frame 1, and then the face cover 2 is fastened to the middle frame 1. After the face cover 2 is assembled onto the middle frame 1, the clamping plate 21 on the side of the face cover 2 facing the first circuit board 4 contacts the edge of the first circuit board 4 or a position without electronic components, thus securing the first circuit board 4. The first circuit board 4 is pressed firmly onto the middle frame 1 to prevent it from moving. Then, in the same way, the second circuit board 5 is assembled to the corresponding position on the middle frame 1. Next, the bottom cover 3 is fastened onto the middle frame 1. After the bottom cover 3 is assembled onto the middle frame 1, the pressing protrusion 31 on the side of the bottom cover 3 facing the second circuit board 5 contacts the position of the second circuit board 5 without electronic components, pressing the second circuit board 5 firmly onto the middle frame 1 to prevent it from moving. Finally, the front cover 2, the first circuit board 4, the middle frame 1, the second circuit board 5, and the bottom cover 3 are locked into a single structure by a through-type fastener 6. By optimizing the structure of the vehicle host, the through-type fastener 6 is used for integrated locking, replacing the separate locking of each component, reducing the number of fasteners used, reducing the cycle time, and improving the assembly efficiency of the vehicle host.

[0043] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0044] Furthermore, the terms "first," "second," etc., 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. Therefore, the inclusion of "first," "second," etc., in a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vehicle-mounted host computer, characterized by comprising: The device includes a middle frame, a front cover and a bottom cover that are respectively fastened to both sides of the middle frame in the height direction. A first circuit board is provided between the middle frame and the front cover, and a second circuit board is provided between the middle frame and the bottom cover. The front cover is provided with a clamping plate for pressing and fixing the first circuit board to the middle frame, and the bottom cover is provided with a clamping protrusion for pressing and fixing the second circuit board to the middle frame. The front cover, the first circuit board, the middle frame, the second circuit board and the bottom cover are fastened together into an integral structure by through fasteners.

2. The in-vehicle host of claim 1, wherein, The bottom cover has a first fastening hole, the middle frame has a third fastening hole, and the top cover has a fifth fastening hole. The fastener is a through screw, which passes through the first fastening hole and the third fastening hole in sequence and is locked to the fifth fastening hole.

3. The in-vehicle host of claim 1, wherein, The cover includes a panel and a first side panel surrounding the panel. The first side panel has snap-fit ​​holes, and the side wall of the middle frame has snap-fits that engage with the snap-fit ​​holes.

4. The in-vehicle host of claim 3, wherein, The first side plate is provided with a first positioning groove, the panel is provided with a first positioning hole, and the middle frame is provided with a first positioning protrusion corresponding to the first positioning groove and a first positioning post corresponding to the first positioning hole.

5. The in-vehicle host of claim 1, wherein, The middle frame has a first mounting area on the side facing the face cover, the first circuit board is located in the first mounting area, and the first mounting area has a second positioning post for positioning the first circuit board.

6. The in-vehicle host of claim 5, wherein, The middle frame has a heat dissipation protrusion on the side facing the second circuit board, and the second circuit board is in contact with the heat dissipation protrusion.

7. The in-vehicle host of claim 6, wherein, Heat dissipation fins are provided on the side of the first installation area.

8. The in-vehicle host of claim 7, wherein, The edge of the second circuit board is provided with a positioning protrusion, the middle frame is provided with a third positioning groove at the position corresponding to the positioning protrusion, and a third positioning post for positioning the second circuit board is provided next to the heat dissipation boss.

9. The in-vehicle host of claim 1, wherein, The bottom cover includes a bottom plate and a second side plate surrounding the bottom plate. The second side plate is provided with a second positioning groove, and the middle frame is provided with a second positioning protrusion corresponding to the second positioning groove.

10. The in-vehicle host of claim 1, wherein, The fastener is a bolt integrally formed with the bottom cover. The middle frame is provided with a third fastening hole, and the top cover is provided with a fifth fastening hole. The bolt passes through the third fastening hole and the fifth fastening hole in sequence and is locked to the top cover by a nut.

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