A four-door special-purpose vehicle intake system

Abstract

The application provides a four-door special-purpose vehicle air intake system, and belongs to the technical field of vehicle air intake systems.The technical scheme is as follows: a four-door special-purpose vehicle air intake system, comprising an air cleaner, a pre-filter being arranged above the air cleaner, and an air outlet pipe of the pre-filter being connected with an air inlet of the air cleaner, the air cleaner and the pre-filter being arranged above an upper wing surface of a vehicle frame, and the air cleaner and the pre-filter being jointly installed on a combined support assembly, the combined support assembly being fixedly connected with the vehicle frame; an air outlet of the air cleaner being connected with an air inlet end of an air outlet rubber pipe, the air inlet end of the air outlet rubber pipe being connected with an air inlet end of an air outlet steel pipe, the air inlet end of the air outlet steel pipe being capable of being connected with an air inlet of an engine supercharger, and the air outlet steel pipe being arranged above the upper wing surface of the vehicle frame.The application has the beneficial effect of effectively avoiding water intake hazards when the vehicle is wading, thereby ensuring driving safety.

Description

Technical Field

[0001] This application belongs to the technical field of vehicle air intake systems, specifically relating to a four-door vehicle air intake system. Background Technology

[0002] The vehicle's air intake system provides the engine with clean, dry, sufficient, and stable air through a complete air filtration system to meet the engine's air requirements during operation and ensure engine power. The filtration system prevents impurities and large dust particles from entering the engine's combustion chamber, thus avoiding abnormal engine wear and improving engine reliability.

[0003] As shown in the patent with publication number CN108518291A, the core filtering components of the existing air intake system mostly adopt a low-position installation layout. The air filter is often fixed under the cab floor, and some models even integrate the air filter and pre-filter in the right rear door step bracket. The air intake duct is usually fixed in the rear or side of the cab, and its air outlet is directly connected to the air inlet of the air filter. Moreover, the air inlet of the air intake duct is mostly located on the side or lower part of the vehicle. All the core components are still within the low-position installation range of the vehicle.

[0004] However, due to the low installation position of the air filter and pre-filter, when a vehicle drives through sections of road with deep water, the negative pressure generated by the engine will directly draw water from the road surface into the pre-filter, and then into the air filter. This water not only quickly soaks the air filter element, causing a decrease in filtration accuracy and an increase in intake resistance, but also accelerates mold growth and damage to the filter element, significantly shortening its lifespan. In extreme cases, water can enter the engine combustion chamber with the intake airflow, causing abnormal wear on components such as pistons and cylinder walls, and even directly leading to engine power interruption, seriously affecting the vehicle's driving safety and reliability. Utility Model Content

[0005] This application addresses the problem that existing air intake systems are installed too low, making vehicles prone to water ingress when wading through water, thus affecting driving safety. It provides a four-door dedicated vehicle air intake system that can effectively avoid the risk of water ingress when vehicles are wading through water, thereby ensuring driving safety.

[0006] To solve the above problems, the technical solution adopted in this application is a four-door vehicle air intake system, including an air filter, a pre-filter above the air filter, and the air outlet pipe of the pre-filter connected to the air inlet of the air filter. Both the air filter and the pre-filter are located above the upper wing surface of the vehicle frame, and the air filter and the pre-filter are jointly mounted on a combined bracket assembly, which is fixedly connected to the vehicle frame. The air outlet of the air filter is connected to the air inlet end of the air outlet hose, the air outlet end of the air outlet hose is connected to the air inlet end of the air outlet steel pipe, and the air outlet end of the air outlet steel pipe can be connected to the air inlet of the engine turbocharger, and the air outlet steel pipe is located above the upper wing surface of the vehicle frame.

[0007] In this technical solution, a pre-filter is provided above the air filter, and the air outlet pipe of the pre-filter is connected to the air inlet of the air filter. Both the air filter and the pre-filter are located above the upper wing surface of the frame, and both are mounted together on the combined bracket assembly, which is fixedly connected to the frame. The air outlet of the air filter is connected to the air inlet end of the air outlet hose, and the air outlet end of the air outlet hose is connected to the air inlet end of the air outlet steel pipe. The air outlet end of the air outlet steel pipe can be connected to the air inlet of the engine turbocharger, and the air outlet steel pipe is also located above the upper wing surface of the frame. Compared to existing technologies where air filters, pre-filters, and intake pipes are typically installed in low-lying areas such as below the cab floor or on the foot pedal brackets, this solution elevates the core filtration components of the intake system—the air filter, pre-filter, and the crucial exhaust pipe—to above the upper wing of the vehicle frame. This significantly increases the installation height compared to the depth of water in typical wading sections, fundamentally preventing the risk of engine negative pressure drawing water directly into the pre-filter and air filter when the vehicle passes through deep water. Simultaneously, the robust connection between the combined bracket assembly and the frame ensures the structural reliability of this high-level arrangement. Combined with the sealed connection between the exhaust hose and the exhaust pipe, this further blocks the path of water infiltration, effectively eliminating the risk of water ingress during wading, ensuring engine intake cleanliness and operational stability, and ultimately providing reliable protection for vehicle safety.

[0008] Furthermore, the pre-filter's outlet pipe is equipped with a hose clamp one, the outlet hose's inlet end with a hose clamp two, and the outlet hose's outlet end with a hose clamp three. By installing dedicated hose clamps at the connection points between the pre-filter and the air filter, and at both ends of the outlet hose, the sealing performance of each pipe connection node can be specifically enhanced. This effectively prevents pipe loosening or gaps caused by vibration during vehicle operation, avoids external moisture and dust from seeping into the intake system through connection gaps, and ensures stable airflow within the pipes. This reduces the problem of insufficient engine air intake caused by air leakage, further improving the reliability of the intake system.

[0009] Furthermore, both the inlet and outlet ends of the exhaust pipe are equipped with pipe clamps. The pipe clamp near the inlet end of the exhaust pipe is fixedly connected to bracket one, which is fixed to bracket two. Bracket two is fixed to the muffler mounting bracket, which is fixedly connected to the vehicle frame. The pipe clamp near the outlet end of the exhaust pipe is fixedly connected to bracket three, which is fixed to bracket four, which is fixedly connected to the vehicle frame. The pipe clamps at both ends of the exhaust pipe ensure a rigid connection between the pipe and adjacent pipes, preventing pipe detachment or displacement due to vehicle bumps. The cascaded fixing structure of the multi-layer brackets, muffler mounting bracket, and vehicle frame distributes the stress on the exhaust pipe to the vehicle frame and muffler mounting bracket, significantly improving the installation stability of the exhaust pipe and reducing vibration fatigue during long-term use. At the same time, the shared design of the muffler mounting bracket simplifies the overall structural layout and reduces the manufacturing cost of additional brackets.

[0010] Furthermore, bracket four is L-shaped, with two connecting holes on the vertical section where it fits against the side of the frame. These connecting holes are elongated oval holes extending along the length of the frame. The L-shaped structure allows bracket four to form surface contact with the side of the frame, increasing the stress area and improving the stability of the connection with the frame. The elongated oval connecting holes extending along the length of the frame allow for flexible adjustment of the installation position of bracket four during assembly, effectively compensating for dimensional errors during the manufacturing of the frame or bracket, avoiding assembly difficulties caused by accumulated tolerances, ensuring a precise fit between bracket four and the frame, and thus guaranteeing the installation accuracy of the exhaust pipe end, reducing stress caused by positional deviations in the pipeline.

[0011] Furthermore, the combined bracket assembly includes two vertical beams, which are parallel to each other and fixed to the side of the frame; a horizontally arranged crossbeam is fixed to the top of each vertical beam, which is located above the upper wing surface of the frame; two L-shaped tube beams are provided on the crossbeams, the bottom horizontal section of each L-shaped tube beam is vertically fixed to the two crossbeams, and the top vertical section of the L-shaped tube beam extends vertically upward. Two parallel vertical beams provide bottom support for the combined bracket assembly, and their fixing method to the side of the frame ensures the basic stability of the overall structure. The horizontally arranged crossbeams are located above the upper wing surface of the frame, providing a high-level mounting platform for the air filter and pre-filter, directly meeting the raising requirements of the core components. The L-shaped tube beam forms a cross-connection structure through the vertical connection between the bottom horizontal section and the two crossbeams, enhancing the connection strength between the crossbeams, while the top vertical section provides stable vertical support for the pre-filter. The overall frame structure can not only ensure the installation height of the air filter and pre-filter, but also distribute the load generated by the weight of the components, improving the load-bearing capacity of the combined bracket assembly.

[0012] Furthermore, at least two connecting beams are fixedly connected between the two vertical beams. These connecting beams are horizontally arranged and parallel to the crossbeams. The horizontal connecting beams between the two vertical beams and the crossbeams form a parallel transverse support structure, which effectively enhances the lateral deformation resistance of the vertical beams and prevents them from tilting or bending when bearing the weight of the air filter and pre-filter. At the same time, the arrangement of multiple connecting beams creates a closed frame structure for the combined bracket assembly, significantly improving overall rigidity. This ensures that the bracket assembly will not deform significantly due to vibration when the vehicle is traveling on complex road conditions, thereby guaranteeing the stable installation position of the air filter and pre-filter and preventing pipeline connection failures caused by positional misalignment.

[0013] Furthermore, several through holes are provided on the vertical beam, and a sleeve is fixedly installed in each through hole, with the sleeve perpendicular to the side of the frame. The through holes on the vertical beam are used to pass bolts to connect with the frame or other components, while the sleeves in the through holes enhance the local structural strength at the through holes, preventing the vertical beam from tearing or deforming due to stress concentration when the bolts are tightened. The way the sleeves are set perpendicular to the side of the frame ensures that the force direction of the bolts is consistent with the axis of the sleeves, so that the preload of the bolts is evenly transmitted to the vertical beam and the frame, improving the reliability and durability of the connection, while reducing fatigue damage to the vertical beam during long-term use.

[0014] Furthermore, each crossbeam has two notches on its side, with the horizontal sections of the two L-shaped tube beams located within each notch. Each crossbeam also has two clearance holes at its top, with the diameter of the clearance holes larger than the outer diameter of the pneumatic wrench sleeve. The notches on the side of the crossbeam limit the horizontal sections of the L-shaped tube beams, ensuring the vertical connection accuracy between the L-shaped tube beams and the crossbeams, preventing lateral displacement of the L-shaped tube beams under stress, and enhancing the stability of the connection. The clearance holes at the top of the crossbeams provide operating space for the pneumatic wrench sleeve, allowing assemblers to install or remove the connecting bolts between the air filter and the crossbeam without being restricted by the space above the crossbeam, significantly improving assembly and maintenance efficiency and reducing operational difficulty.

[0015] Furthermore, a first reinforcing rib is provided between the vertical beam and the horizontal beam, and a second reinforcing rib is provided between the horizontal and vertical sections of the L-shaped tube beam. Both the first and second reinforcing ribs are obliquely arranged plate-like structures. The connection between the vertical beam and the horizontal beam is the weakest point of the combined support assembly. The obliquely arranged plate-like reinforcing rib can disperse the stress at this point through a triangular stabilizing structure, enhance the shear strength of the connection between the vertical beam and the horizontal beam, and prevent relative rotation or separation between the two under load. Similarly, the second reinforcing rib is provided at the corner of the horizontal and vertical sections of the L-shaped tube beam, which can effectively resist the bending stress at the corner, prevent the L-shaped tube beam from deforming due to the weight or vibration of the pre-filter, ensure its support stability, and extend the service life of the entire combined support assembly.

[0016] Furthermore, a mounting bracket is fixed to the top of the vertical section of the L-shaped tube beam. The mounting bracket has two notches (2), which respectively snap onto the corresponding vertical section of the L-shaped tube beam. The mounting bracket engages with the vertical section of the L-shaped tube beam through the notches (2), allowing for quick positioning of the mounting bracket during assembly and improving assembly efficiency. Simultaneously, the snap-fit ​​structure enhances the connection strength between the mounting bracket and the L-shaped tube beam, preventing the mounting bracket from loosening or shifting during vehicle vibration. This ensures the positional stability of the pre-filter after it is fixed by the mounting bracket, thereby guaranteeing a reliable pipeline connection between the pre-filter and the air filter and reducing pipeline twisting or leakage problems caused by positional deviations.

[0017] As can be seen from the above technical solutions, the beneficial effects of this application are as follows: 1. Significantly improves the vehicle's wading ability, preventing water from being sucked into the air intake system and ensuring driving safety.

[0018] 2. Optimize the support and pipeline fixing structure to enhance overall rigidity and connection reliability, and extend service life.

[0019] 3. The design of elongated holes and clearance holes reduces assembly difficulty, improves maintenance efficiency, and reduces costs by using shared brackets. Attached Figure Description

[0020] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a structural schematic diagram of a specific embodiment of this application; Figure 2 This is a front view schematic diagram of a specific embodiment of this application; Figure 3 This is a left-side view of a specific embodiment of this application; Figure 4 This is a structural schematic diagram of the combined support assembly in a specific embodiment of this application; Figure 5 This is a front view schematic diagram of the combined support assembly in a specific embodiment of this application; Figure 6 This is a left-side view of the combined support assembly in a specific embodiment of this application; Figure 7 This is a schematic diagram of the crossbeam structure in a specific embodiment of this application; Figure 8 for Figure 7 A top-down view; Figure 9This is a schematic diagram of the structure of bracket four in a specific embodiment of this application.

[0022] In the diagram: 1. Air filter; 2. Pre-filter; 3. Frame; 4. Combined bracket assembly; 5. Exhaust hose; 6. Exhaust steel pipe; 7. Hose clamp one; 8. Hose clamp two; 9. Hose clamp three; 10. Steel pipe clamp; 11. Bracket one; 12. Bracket two; 13. Muffler mounting bracket; 14. Bracket three; 15. Bracket four; 16. Vertical beam; 17. Horizontal beam; 18. L-shaped tube beam; 19. Connecting beam; 20. Sleeve; 21. Reinforcing rib one; 22. Reinforcing rib two; 23. Mounting bracket; 24. Notch two; 25. Connecting hole; 26. Notch one; 27. Clearance hole. Detailed Implementation

[0023] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0024] A four-door vehicle intake system is designed to address the water ingress problem caused by the low mounting position of core components in existing intake systems. By employing a high-positioning arrangement and optimized fixing structure, the system ensures vehicle driving safety and the reliability of the intake system. Figure 1-3 As shown, its core components include an air filter 1, a pre-filter 2, a frame 3, a combined bracket assembly 4, an exhaust hose 5, and an exhaust steel pipe 6. The air filter 1 and the pre-filter 2 are mounted together on the combined bracket assembly 4, which is fixedly connected to the frame 3. The air filter 1 is connected to the engine turbocharger intake port in sequence through the exhaust hose 5 and the exhaust steel pipe 6. The specific positional relationship and connection structure of each component are described in detail below.

[0025] like Figure 4-6As shown, the combined bracket assembly 4 serves as the mounting base for the air filter 1 and pre-filter 2, and its structural design directly determines the stability of the high-position installation. The combined bracket assembly 4 includes two vertical beams 16, which are parallel to each other and fixed to the side of the frame 3 by bolts. Several through holes are formed on the vertical beams 16, and a sleeve 20 is welded and fixed into each through hole. The sleeve 20 is perpendicular to the side of the frame 3, and its axis is completely coincident with the axis of the through hole. The sleeve 20 is made of high-strength steel, which effectively enhances the local structural strength at the through hole, preventing the vertical beam 16 from tearing or deforming due to concentrated stress during subsequent bolt tightening. It also ensures that the direction of bolt force is consistent with the axis of the sleeve 20, allowing the bolt preload to be evenly transmitted to the vertical beam 16 and the frame 3, improving the reliability and durability of the connection.

[0026] like Figure 7-8 As shown, the top of each vertical beam 16 is fixedly connected to a horizontally arranged crossbeam 17 by welding. The crossbeam 17 is located above the upper wing surface of the frame 3. A U-shaped notch is pre-cut at the upper end of the vertical beam 16. The end of the crossbeam 17 is inserted into the U-shaped notch and then fully welded to ensure the verticality and stability of the connection between the vertical beam 16 and the crossbeam 17. Two L-shaped tube beams 18 are provided on the crossbeam 17. Two notches 26 are cut on the side of each crossbeam 17. The bottom horizontal sections of the two L-shaped tube beams 18 are respectively inserted into the two notches 26. The vertical connection between the L-shaped tube beams 18 and the crossbeam 17 is achieved by welding. The size of the notch 26 is adapted to the cross-sectional size of the horizontal section of the L-shaped tube beam 18, which can provide lateral restraint for the L-shaped tube beam 18 and prevent displacement under stress. The top vertical section of the L-shaped tube beam 18 extends vertically upward to provide vertical support for the installation of the pre-filter 2.

[0027] At least two connecting beams 19 are fixedly connected to the two vertical beams 16 by welding. The connecting beams 19 are horizontally arranged and parallel to the horizontal beams 17. The two ends of the connecting beams 19 are welded to the inner sidewalls of the two vertical beams 16 respectively, forming a closed frame structure together with the two vertical beams 16 and the two horizontal beams 17. This greatly improves the overall rigidity and resistance to lateral deformation of the combined support assembly 4, and prevents the vertical beams 16 from tilting or bending when bearing the weight of the air filter 1 and the pre-filter 2.

[0028] A reinforcing rib 21 is provided between the vertical beam 16 and the horizontal beam 17, and a reinforcing rib 22 is provided between the horizontal and vertical sections of the L-shaped tube beam 18. Both reinforcing ribs 21 and 22 are obliquely arranged plate-like structures. One end of the reinforcing rib 21 is fixedly connected to the outer wall of the vertical beam 16 by welding, and the other end is fixedly connected to the lower surface of the horizontal beam 17 by welding, forming a triangular stable structure. This disperses the stress at the connection between the vertical beam 16 and the horizontal beam 17, enhances the shear strength of this part, and prevents relative rotation or separation when the two are under load. One end of the reinforcing rib 22 is welded to the upper surface of the horizontal section of the L-shaped tube beam 18, and the other end is welded to the inner wall of the vertical section of the L-shaped tube beam 18. This effectively resists the bending stress at the corner of the L-shaped tube beam 18, prevents deformation due to the weight of the pre-filter 2 or vehicle vibration, and ensures the stability of the support.

[0029] Two clearance holes 27 are provided at the top of each crossbeam 17. The diameter of the clearance hole 27 is larger than the outer diameter of the pneumatic wrench. The clearance hole 27 is provided at the position of the mounting bolt of the air filter 1, which can provide sufficient operating space for the pneumatic wrench. This allows the assembler to install or remove the connecting bolts between the air filter 1 and the crossbeam 17 without being restricted by the space above the crossbeam 17, which significantly reduces the difficulty of operation and improves the efficiency of assembly and maintenance.

[0030] The pre-filter 2 is positioned above the air filter 1, and its outlet pipe is connected to the air inlet of the air filter 1. A mounting bracket 23 is welded to the top of the vertical section of the L-shaped tube beam 18. The mounting bracket 23 has two notches 24, which are respectively snapped into the vertical sections of the two L-shaped tube beams 18. After snapping into place, the mounting bracket 23 is fixedly connected to the vertical section of the L-shaped tube beam 18 by welding. This snap-fit ​​structure enables rapid positioning of the mounting bracket 23, ensuring installation accuracy and enhancing connection strength.

[0031] The pre-filter 2 is bolted to the mounting bracket 23. Its outlet pipe extends towards the air inlet of the air filter 1, and a sealing gasket is fitted at the connection between the outlet pipe and the air inlet of the air filter 1. It is then secured with hose clamp 7, achieving a fixed connection between the pre-filter 2 and the air filter 1 while ensuring a tight seal at the connection to prevent air leakage or moisture ingress. The air filter 1 is bolted to the crossbeam 17 of the combined bracket assembly 4. The bolts pass through the mounting holes at the bottom of the air filter 1 and engage with the pre-drilled threaded holes on the crossbeam 17. During bolt tightening, the clearance hole 27 at the top of the crossbeam 17 allows for the insertion of a pneumatic wrench, ensuring the bolts are properly tightened and achieving a fixed connection between the air filter 1 and the crossbeam 17. This allows the air filter 1 to be stably positioned above the upper wing surface of the frame 3.

[0032] The air outlet of the air filter 1 is connected to the air inlet of the air outlet hose 5, and the connection is secured with hose clamp 2 8 to achieve a fixed connection. The air outlet of the air outlet hose 5 is connected to the air inlet of the air outlet steel pipe 6, and the connection is secured with hose clamp 3 9 after a sealing sleeve is fitted, also achieving a fixed connection. Hose clamps 1 7, 2 8, and 3 9 are all made of stainless steel, and their inner walls have anti-slip textures to enhance friction with the outer wall of the pipe, prevent the pipe from loosening due to vehicle vibration, and improve the sealing performance of the connection.

[0033] Both the inlet and outlet ends of the exhaust pipe 6 are fitted with pipe clamps 10, which are bolted to the outer wall of the exhaust pipe 6. The pipe clamp 10 near the inlet end of the exhaust pipe 6 is welded to bracket 11 for fixed connection. Bracket 11 is bolted to bracket 2 12, which is bolted to muffler mounting bracket 13. The muffler mounting bracket 13 is welded to the frame 3, forming a multi-level fixing structure that distributes the force on the inlet end of the exhaust pipe 6 to the frame 3 and the muffler mounting bracket 13, improving installation stability.

[0034] The steel pipe clamp 10 near the air outlet end of the air outlet steel pipe 6 is fixedly connected to the bracket three 14 by welding. The bracket three 14 is fixedly connected to the bracket four 15 by bolts. The bracket four 15 is fixedly connected to the frame 3. Figure 9 As shown, bracket 4 15 has an L-shaped structure. Two connecting holes 25 are formed on the vertical section that fits against the side of the frame 3. The connecting holes 25 are elongated oval holes extending along the length of the frame 3. Bolts pass through these elongated oval holes to fix bracket 4 15 to the side of the frame 3. The design of the elongated oval holes allows for flexible adjustment of the installation position of bracket 4 15 during assembly, effectively compensating for dimensional errors generated during the manufacturing process of the frame 3 or the bracket, avoiding assembly difficulties caused by accumulated tolerances, ensuring a precise fit between bracket 4 15 and the frame 3, thereby guaranteeing the installation accuracy of the end of the exhaust pipe 6 and reducing stress caused by positional deviations in the pipeline.

[0035] The exhaust pipe 6 is located above the upper wing surface of the frame 3, with its exhaust end extending toward the air intake of the engine turbocharger. It is fixedly connected to the air intake of the engine turbocharger via a flange or quick connector to ensure that the intake airflow can be stably delivered to the engine to meet the engine's operating requirements.

[0036] In this embodiment, all welded connections are made using arc welding, resulting in full welds without any incomplete or missing welds, ensuring the stability of the fixed connections. All bolted connections are equipped with flat washers and spring washers to further enhance the anti-loosening performance and prevent bolt loosening due to long-term vehicle vibration. Through the above-described specific implementation structure, the air filter 1, pre-filter 2, and exhaust pipe 6 are positioned high up, fundamentally avoiding the risk of water ingress during wading. Simultaneously, by optimizing the fixing and connection structure, the overall rigidity, sealing performance, and ease of assembly of the intake system are guaranteed.

[0037] As can be seen from the above embodiments, the beneficial effects of this application are as follows: 1. Significantly improves the vehicle's wading ability, preventing water from being sucked into the air intake system and ensuring driving safety.

[0038] 2. Optimize the support and pipeline fixing structure to enhance overall rigidity and connection reliability, and extend service life.

[0039] 3. The design of elongated holes and clearance holes reduces assembly difficulty, improves maintenance efficiency, and reduces costs by using shared brackets.

[0040] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A four-door vehicle air intake system, comprising an air filter (1), a pre-filter (2) above the air filter (1), and the outlet pipe of the pre-filter (2) connected to the inlet of the air filter (1), characterized in that, The air filter (1) and the pre-filter (2) are both located above the upper wing surface of the frame (3), and the air filter (1) and the pre-filter (2) are jointly mounted on the combined bracket assembly (4), which is fixedly connected to the frame (3). The air outlet of the air filter (1) is connected to the air inlet of the air outlet hose (5), the air outlet of the air outlet hose (5) is connected to the air inlet of the air outlet steel pipe (6), the air outlet of the air outlet steel pipe (6) can be connected to the air inlet of the engine turbocharger, and the air outlet steel pipe (6) is located above the upper wing surface of the frame (3).

2. The four-door vehicle intake system according to claim 1, characterized in that, The pre-filter (2) has a hose clamp 1 (7) on its outlet pipe, a hose clamp 2 (8) on its inlet end of the outlet hose (5), and a hose clamp 3 (9) on its outlet end of the outlet hose (5).

3. The four-door vehicle intake system according to claim 1, characterized in that, The air inlet and outlet of the exhaust pipe (6) are both equipped with pipe clamps (10); the pipe clamp (10) near the air inlet of the exhaust pipe (6) is fixedly connected to bracket one (11), bracket one (11) is fixed on bracket two (12), bracket two (12) is fixed on muffler fixing bracket (13), and muffler fixing bracket (13) is fixedly connected to the frame (3); the pipe clamp (10) near the air outlet of the exhaust pipe (6) is fixedly connected to bracket three (14), bracket three (14) is fixed on bracket four (15), and bracket four (15) is fixedly connected to the frame (3).

4. The four-door dedicated vehicle air intake system according to claim 3, characterized in that, The fourth bracket (15) is L-shaped. Two connecting holes (25) are opened on the vertical section of the fourth bracket (15) that fits against the side of the frame (3). The connecting holes (25) are elongated holes that extend along the length of the frame (3).

5. The four-door vehicle intake system according to claim 1, characterized in that, The combined support assembly (4) includes two vertical beams (16), which are parallel to each other and fixed to the side of the frame (3); each vertical beam (16) has a horizontally arranged crossbeam (17) fixed at the top, and the crossbeam (17) is located above the upper wing surface of the frame (3); the crossbeam (17) is provided with two L-shaped tube beams (18), the bottom horizontal section of each L-shaped tube beam (18) is vertically fixed to the two crossbeams (17), and the top vertical section of the L-shaped tube beam (18) extends vertically upward.

6. The four-door vehicle intake system according to claim 5, characterized in that, At least two connecting beams (19) are fixedly connected between the two vertical beams (16). The connecting beams (19) are horizontally arranged and parallel to each other with the horizontal beams (17).

7. The four-door vehicle intake system according to claim 5, characterized in that, The vertical beam (16) has several through holes, and each through hole is fixedly fitted with a sleeve (20), which is perpendicular to the side of the frame (3).

8. The four-door vehicle intake system according to claim 5, characterized in that, Two notches (26) are opened on the side of each crossbeam (17), and the horizontal sections of the two L-shaped tube beams (18) are located in the two notches (26) respectively; two clearance holes (27) are opened on the top of each crossbeam (17), and the diameter of the clearance holes (27) is larger than the outer diameter of the pneumatic wrench sleeve.

9. The four-door vehicle intake system according to claim 5, characterized in that, A reinforcing rib (21) is provided between the vertical beam (16) and the horizontal beam (17), and a reinforcing rib (22) is provided between the horizontal and vertical sections of the L-shaped tube beam (18). Both the reinforcing rib (21) and the reinforcing rib (22) are obliquely arranged plate structures.

10. The four-door vehicle intake system according to claim 5, characterized in that, The top of the vertical section of the L-shaped pipe beam (18) is fixed with an installation bracket (23). The installation bracket (23) has two notches (24) which are respectively engaged with the corresponding vertical section of the L-shaped pipe beam (18).

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