Engine air inlet structure, engine system and vehicle

Abstract

The utility model provides an engine air inlet structure, an engine system and a vehicle, and belongs to the field of vehicles, the engine air inlet structure comprises a plurality of air inlet branches which are independently arranged, and a communication branch arranged between at least two air inlet branches. In addition, an air outlet of each air inlet branch is connected with an air inlet of the engine, and the communicating branch is arranged at the end, close to the air inlet, of each air inlet branch. According to the air inlet structure of the engine, the phase difference can be generated when sound waves are transmitted in different branches, when the sound waves are converged through the communicating branches, the sound waves with part of frequencies can be mutually counteracted due to opposite phases, and therefore the order noise with the specific frequency is reduced. In addition, the inherent frequency of the air inlet system can be changed through the communicating branch, and the situation that the engine order noise frequency coincides with the resonant frequency of the air inlet system can be effectively avoided. Moreover, the structure is compact, efficient noise control can be achieved in a limited engine compartment space, and the problem that space arrangement is limited can be effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field, especially a kind of engine air intake structure, simultaneously, the utility model also relates to a kind of engine system with the engine air intake structure, and vehicle with the engine system. BACKGROUND

[0002] During the driving of automobile, booming sound is easy to be produced in the vehicle, and the main cause of the noise is the order noise produced by the engine when it is running at low speed, which is transmitted into the vehicle through the air intake system or the exhaust system. When the frequency of the noise is consistent with the natural frequency of the acoustic cavity in the vehicle, acoustic resonance phenomenon will be caused. The negative effects of the resonance noise are multidimensional. On the one hand, from the perspective of riding comfort, it will greatly destroy the quiet acoustic environment in the vehicle, so that the driver and passengers are greatly disturbed by the noise during the journey, and the comfort of the riding experience is significantly reduced. On the other hand, the driver and passengers are easily in a state of fatigue after long-term exposure to the noisy resonance environment, which will pose a serious threat to driving safety.

[0003] To solve the above problems, the common solutions include trying to increase the volume of the air filter to expand the internal space of the air filter so that the airflow can be more fully buffered and noise-reduced therein. Or install a Helmholtz resonance muffler to precisely cancel the noise of a specific frequency by using its special acoustic structure. However, due to the severe restrictions of vehicle space layout, especially in the trend of modern cars pursuing compact and efficient design, the available space in the engine compartment is increasingly limited. In such a cramped space environment, it is difficult to have enough space to design and place a large-volume air filter. Or it is difficult to provide enough space to design a large-volume air filter or a complex Helmholtz muffler in the case of limited space in the engine compartment. SUMMARY

[0004] Therefore, the utility model aims at providing an engine air intake structure to solve the problem that the existing air intake system cannot effectively suppress the order noise due to the space limitation of the engine compartment.

[0005] To achieve the above purpose, the technical scheme of the utility model is as follows:

[0006] An engine air intake structure, comprising a plurality of air intake branches arranged independently, and a communication branch arranged between at least two of the air intake branches.

[0007] The air outlet of each air intake branch is connected to the air inlet of the engine, and the communication branch is arranged at one end of each air intake branch close to the air inlet.

[0008] Further, each of the air intake branches comprises an air cleaner and an air outlet pipe arranged at an outlet of the air cleaner;

[0009] The air outlet pipes of each of the air intake branches are connected with the air intake port, and the communication branch is arranged between the two air outlet pipes.

[0010] Further, a muffler is arranged in series with the air outlet pipe, and the muffler is arranged upstream of the communication branch along a gas flow path in the air outlet pipe.

[0011] Further, the air outlet pipe comprises a first pipe body connected with the air cleaner and a second pipe body connected with the air intake port.

[0012] The second pipe body extends along a top-bottom direction of the vehicle, and the second pipe body has a curved section curved to one side of the first pipe body, the muffler is arranged between the first pipe body and the curved section, and the communication branch is arranged between the curved sections of the two air outlet pipes.

[0013] Further, the curved section is provided with a convex portion protruding outward, the convex portion is provided with a pipe joint, and the communication branch comprises a communication pipe inserted into the pipe joint.

[0014] Further, the communication pipe is a rubber pipe; and / or,

[0015] The second pipe body is a corrugated pipe.

[0016] Further, the air intake branches are two air intake branches arranged oppositely along a left-right direction of the vehicle.

[0017] The communication branch extends along the left-right direction of the vehicle and is arranged in an "H" shape between the two air intake branches.

[0018] Further, the structures of the plurality of air intake branches are the same.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] The engine intake structure, through setting independent multiple intake branches, and setting the communication branch between at least two intake branches, therefore, the design of multiple intake branches can disperse noise energy into different paths, reduces the noise intensity in single intake path, and moreover, can make the phase difference when sound waves propagate in different branches, when sound waves converge through the communication branch, the sound waves of partial frequency will be mutually cancelled due to opposite phase, thereby reducing the order noise of specific frequency.In addition, the communication branch can change the acoustic characteristics of the intake system, thereby changing the natural frequency of the intake system, can effectively avoid the coincidence of the engine order noise frequency and the intake system resonance frequency, thereby inhibiting the acoustic resonance phenomenon.Therefore, compared with the traditional setting of large-capacity muffler, the engine intake structure is more compact in structure, does not need larger arrangement space, can realize efficient noise control in the limited engine compartment space, can effectively solve the problem of limited space arrangement.

[0021] Secondly, each intake branch includes an air cleaner, and an air outlet pipe arranged at the outlet of the air cleaner, and the communication branch is arranged between the two air outlet pipes, the air cleaner can filter air and also play a certain buffering and stabilizing effect on airflow, which can help to reduce noise and vibration caused by unstable airflow; the communication branch is connected between the two air outlet pipes, which can balance the pressure between different intake branches and reduce engine shaking and noise caused by uneven intake.

[0022] By setting the muffler upstream of the communication branch, the noise can be preliminarily attenuated before entering the communication branch, avoiding the propagation and superposition of noise between multiple branches, thereby more effectively reducing the overall noise level, and also effectively inhibiting the acoustic resonance phenomenon, and adjusting the phase characteristics of the sound wave, so that the sound wave in the communication branch and the sound wave in the other branch better phase cancellation, further enhancing the noise control effect.

[0023] Furthermore, the muffler is located between the curved segments of the first pipe body and the second pipe body, which can attenuate noise in the early stage of propagation, avoiding further amplification of noise in the second pipe body, and the communication branch is arranged between the curved segments of the two air outlet pipes, which can make the airflow entering the communication branch relatively stable, so that the communication branch is not disturbed by too much complex noise when adjusting the acoustic resonance, and can more effectively process the target order noise, further improving the noise reduction performance of the entire intake system.

[0024] In addition, by arranging the convex part outwardly protruding on the bending section and arranging the pipe joint, the installation and dismounting of the communication branch become easier. The communication pipe is made of rubber pipe, which has good flexibility and elasticity, can effectively buffer the impact force caused by engine vibration and intake airflow pulsation, and has relatively low elastic modulus, so that the flexible structure can change the acoustic characteristics of the communication branch, help to adjust the natural frequency of the intake structure, and avoid resonance phenomenon during engine operation. The second pipe body is made of corrugated pipe, which can effectively buffer the engine vibration.

[0025] The two intake branches are arranged in the left-right direction of the vehicle, which can make the intake on both sides of the engine more uniform. The communication branch is arranged in the shape of "H" with the two intake branches. Due to the geometric symmetry of the layout, when the engine operates at low speed and generates order noise, the noise propagates in the two intake branches and the communication branch, and the interference phenomenon is more likely to occur, which can effectively reduce the strength of the order noise. The structures of the multiple intake branches are the same, which can ensure the airflow characteristics of each branch to be consistent, and also help to better offset the noise in different intake branches in the communication branch, so that the order noise can be more effectively reduced.

[0026] Another purpose of the utility model is to provide an engine system, which comprises an engine and an engine intake structure as described above connected with the engine.

[0027] The engine system can reduce the noise source in the engine compartment, avoid the transmission of noise into the vehicle to cause acoustic resonance, thereby significantly reducing the booming sound in the vehicle and improving the acoustic comfort in the vehicle. Moreover, the structure is compact, does not require a large layout space, and is convenient to arrange in the limited engine compartment.

[0028] Meanwhile, the utility model also provides a vehicle, which is provided with the engine system as described above.

[0029] The vehicle can effectively suppress the engine noise, create a quiet and comfortable space for the driver and passengers, and improve the ride comfort and quality of the vehicle. Meanwhile, the engine system is more compact, does not require a large layout space, and can be arranged in the limited engine compartment space, thereby facilitating the arrangement of other components in the engine compartment and effectively solving the problem of limited space arrangement. BRIEF DESCRIPTION OF DRAWINGS

[0030] The drawings that form a part of the utility model are used to provide a further understanding of the utility model, and the illustrative embodiments of the utility model and the description thereof are used to explain the utility model and do not constitute an improper limitation on the utility model. In the drawings:

[0031] Figure 1 A structure schematic view of the engine intake structure according to the embodiment one of the present application;

[0032] Figure 2 A structure schematic view of the engine intake structure according to the embodiment one of the present application from another perspective;

[0033] Figure 3 A partial structure schematic view of the engine intake structure according to the embodiment one of the present application;

[0034] Figure 4 A partial structure schematic view of the engine intake structure according to the embodiment one of the present application;

[0035] Figure 5 A structure schematic view of the pipe joint according to the embodiment one of the present application;

[0036] Figure 6 A correlation between the engine speed and the order noise at the intake port thereof according to the embodiment two of the present application.

[0037] Explanation of reference signs:

[0038] 1, intake branch; 2, communication branch;

[0039] 101, air cleaner; 102, first pipe body; 103, second pipe body; 104, muffler; 105, pipe joint;

[0040] 1031, curved section; 10311, convex part;

[0041] 201, main section; 202, connecting section. DETAILED DESCRIPTION

[0042] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0043] In the description of the present application, it should be noted that the orientation words such as "up, down, left, right, front, back" used in the present embodiment are defined based on the up-down direction, left-right direction and front-back direction of the automobile. Among them, the up-down direction of the automobile is also the height direction (Z direction) of the automobile, the front-back direction of the automobile is also the length direction (X direction) of the automobile, and the left-right direction of the automobile is also the width direction (Y direction) of the automobile. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0044] Moreover, in the description of the utility model, unless otherwise expressly limited, the terms "mounting", "connecting", "connection", "connector" should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected. It can be mechanically connected, or it can be electrically connected. It can be directly connected, or it can be indirectly connected through an intermediate medium. It can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood in combination with specific circumstances.

[0045] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0046] Embodiment one

[0047] During the driving process of the automobile, the order noise generated by the engine when running at low speed is transmitted into the vehicle through the air intake system or the exhaust system. In the prior art, in order to solve the order noise of the engine, the volume of the air cleaner 101 is usually increased or a Helmholtz resonance muffler 104 is additionally installed. Moreover, if it is required to reduce the order noise by 3dB, the volume of the air cleaner 101 generally needs to be increased by 3L. In the case of limited engine compartment space, this method is difficult to implement. Therefore, the present embodiment particularly proposes a novel engine air intake structure to solve the problem that the existing air intake system cannot effectively suppress the order noise due to the limitation of the engine compartment space.

[0048] In the present embodiment, the engine air intake structure comprises a plurality of air intake branches 1 which are independently arranged, and a communication branch 2 which is arranged between at least two air intake branches 1. Moreover, the air outlet of each air intake branch 1 is connected with the air inlet of the engine, and the communication branch 2 is arranged at one end of each air intake branch 1 close to the air inlet.

[0049] The engine air intake structure of the present embodiment, by arranging a plurality of independent air intake branches 1 and a communication branch 2 between at least two air intake branches 1, the design of the plurality of air intake branches 1 can disperse the noise energy into different paths, thereby reducing the noise intensity in a single air intake path, and the phase difference can be generated when the sound waves propagate in different branches. When the sound waves converge through the communication branch 2, the sound waves of some frequencies will be cancelled out due to the opposite phase, thereby reducing the order noise of the specific frequency.

[0050] In addition, the communication branch 2 can change the acoustic characteristics of the air intake system, thereby changing the natural frequency of the air intake system, which can effectively avoid the coincidence of the engine order noise frequency and the air intake system resonance frequency, thereby suppressing the acoustic resonance phenomenon. Therefore, compared with the traditional large-volume muffler, the engine air intake structure of the present embodiment has a more compact structure and does not require a large layout space, and can achieve efficient noise control in a limited engine compartment space, thereby effectively solving the problem of limited space layout.

[0051] Based on the overall introduction as above, one exemplary structure of the engine intake structure of the present embodiment is shown in FIG. 1, and as a preferred embodiment, the structures of the plurality of intake branches 1 are all identical. By so arranging, on the one hand, the airflow characteristics of each intake branch 1 can be ensured to remain consistent, so that the airflow entering the engine is stable and uniform. On the other hand, when the noises in different intake branches 1 are conducted to the communication branch 2, the identical structures help the noises to better cancel each other based on the acoustic characteristics, and in turn, the order noise can be reduced in a more efficient manner, creating a relatively quiet intake environment for the engine operation. Figures 1 to 4

[0052] As a specific embodiment, the engine intake structure of the present embodiment is particularly suitable for a dual supercharged engine. Since a dual supercharged engine is generally equipped with two intake ports, the number of intake branches 1 in the engine intake structure is set to two, and the two intake branches 1 are arranged in a relative arrangement state in the left-right direction of the vehicle. At the same time, the communication branch 2 is extended along the left-right direction of the vehicle and, together with the two intake branches 1, forms an "H" shaped arrangement structure. Based on the geometric symmetry of this arrangement, when the engine is in a low speed operating condition and inevitably generates order noise, the noise is extremely prone to interference during the propagation in the channel formed by the two intake branches 1 and the communication branch 2.

[0053] Since the phases of the sound waves are opposite during the interference process, the noise energy is partially canceled, thereby effectively reducing the intensity of the order noise. Moreover, this symmetrical structure can also make the acoustic characteristics of the entire intake system more balanced, effectively avoiding the problem of resonance frequency shift caused by the difference between the left and right intake paths, and can greatly reduce the risk of coinciding with the frequency of the engine order noise, thereby reducing the noise hazard from the root. In addition, the left and right relative arrangement of the intake branches 1 can also reliably ensure that the intake amount on both sides of the engine is evenly distributed, and the combustion fluctuation phenomenon caused by uneven airflow distribution is minimized, thereby reducing the noise source intensity from the source of noise generation, and optimizing the intake and operation state of the engine in all directions.

[0054] It should be noted that the number of intake branches 1 is not limited to two in a relative arrangement, and in actual application scenarios, the number of intake branches 1 can be flexibly set to other suitable numbers according to different structural designs, performance requirements, and application conditions of the engine, to meet the diversified engine intake requirements.

[0055] As a specific embodiment, the engine intake structure of the present embodiment is particularly suitable for a dual supercharged engine. Since a dual supercharged engine is generally equipped with two intake ports, the number of intake branches 1 in the engine intake structure is set to two, and the two intake branches 1 are arranged in a relative arrangement state in the left-right direction of the vehicle. At the same time, the communication branch 2 is extended along the left-right direction of the vehicle and, together with the two intake branches 1, forms an "H" shaped arrangement structure. Based on the geometric symmetry of this arrangement, when the engine is in a low speed operating condition and inevitably generates order noise, the noise is extremely prone to interference during the propagation in the channel formed by the two intake branches 1 and the communication branch 2. Figures 1 to 4 ​As shown in the figure, each intake branch 1 includes an air filter 101, and an air outlet pipe arranged at the outlet of the air filter 101. Moreover, the air outlet pipe of each intake branch 1 is connected with the air inlet of the engine, and the communication branch 2 is arranged between the two air outlet pipes. The air filter 101 directly adopts the conventional structure in the prior art, and refers to the conventional setting of the existing vehicle. Based on the characteristics that it has been widely recognized and applied, the internal structure and working principle thereof will not be described here. By equipping the air filter 101 on each intake branch 1, the air entering the engine can be effectively guaranteed to have high cleanliness, effectively filtering out particulate matters such as impurities and dust in the air, preventing them from entering the engine and causing wear and damage. At the same time, the air filter 101 can also play a preliminary stabilizing role on the airflow in the process of filtering impurities, which helps to reduce the noise and vibration phenomenon caused by sudden changes in airflow, making the air intake process more stable and smooth, and laying a solid foundation for the stable operation of the engine.

[0056] In addition, the communication branch 2 is connected between the two air outlet pipes, which can effectively balance the pressure between different intake branches 1. During the operation of the engine, the situation of uneven intake often occurs, and the communication branch 2 can intervene in time to effectively reduce the engine vibration and abnormal noise caused by uneven intake through the pressure conduction and balance mechanism, so that the engine runs more stably and reliably, and the overall performance and operation stability of the engine are significantly improved. At the same time, the communication branch 2 and the air outlet pipe together form an acoustic structure similar to a Helmholtz resonator. When the engine order noise propagates to the communication branch 2 through the air outlet pipe, due to the difference in phase and frequency of sound waves in different branches, sound wave interference phenomenon occurs.

[0057] During the interference process, the sound wave energy cancels each other out, so that the order noise frequency generated by the engine under low speed working condition can be accurately and effectively suppressed. By skillfully utilizing the characteristics of sound waves to reduce noise intensity, the acoustic environment in the vehicle is further optimized, providing a more comfortable and quiet driving experience for the driver and passengers, and greatly improving the comfort quality of the vehicle. As a further embodiment, a muffler 104 is connected in series on the air outlet pipe, and along the gas flow path in the air outlet pipe, the muffler 104 is arranged upstream of the communication branch 2. The muffler 104 also adopts the conventional structure in the prior art, and generally has an intake cavity, a muffling cavity and an outlet cavity arranged in sequence inside. The cross section of the intake cavity is designed in a gradually expanding manner. When the airflow flows into the air outlet pipe at high speed, the gradually expanding intake cavity can effectively reduce the flow rate of the airflow, play a preliminary buffering role, avoid the impact of airflow on the internal structure due to excessive speed, and reduce the generation of airflow noise.

[0058] The core noise reduction area, the sound absorption cavity, is filled with sound-absorbing materials such as glass fiber cotton or rock wool. These sound-absorbing materials are carefully arranged in a specific structure, such as a multi-layer staggered arrangement or a honeycomb structure. When noise waves enter the sound absorption cavity, the pores on the surface of the sound-absorbing materials can convert the sound wave energy into heat energy for consumption. Different frequencies of noise will be weakened layer by layer when passing through these complex sound-absorbing structures, achieving efficient absorption and attenuation of multiple frequency noises.

[0059] The design of the outlet cavity is opposite to that of the inlet cavity, adopting a tapered cross-section. It can re-converge and accelerate the airflow before it exits the muffler, ensuring that the airflow enters the subsequent communication branch or inlet at a relatively stable and appropriate flow rate, avoiding the impact on engine intake efficiency due to slow flow rate. In addition, as shown in Figure 4 In order to facilitate the installation of the muffler 104 on the vehicle body, outwardly protruding mounting plates are provided on the outside of the muffler 104 housing. Moreover, the mounting plates are two, located on opposite sides of the muffler 104 housing. This symmetrical layout can ensure uniform stress during installation, avoiding installation skewing or loosening problems caused by unilateral stress. On the other hand, it is also conducive to finding the most suitable installation point in the limited vehicle body space, achieving a compact and reasonable layout. In addition, openings are provided on each mounting plate to allow the connection member connected to the vehicle body to pass through, greatly facilitating the installation operation process.

[0060] In this embodiment, by setting the muffler 104, the noise in the airflow can be effectively attenuated. Its working mechanism helps to reduce pressure fluctuations and high-frequency noise energy in the airflow, thereby greatly reducing the impact of noise on the structure of the communication branch 2 and the vibration influence, protecting the integrity and stability of the communication branch 2 structure and ensuring its continuous and efficient function. In addition, locating the muffler 104 upstream of the communication branch 2 allows the relatively quiet airflow after passing through the muffler 104 to enter the communication branch 2, which is conducive to the communication branch 2 to better balance the pressure and eliminate resonance. Because the airflow noise entering the communication branch 2 at this time is already low, it will not interfere with the effect of the communication branch 2 on airflow pressure balance and sound wave interference, allowing the communication branch 2 to more accurately process order noise and other noise, thereby improving the noise reduction performance of the entire intake system.

[0061] Here, as a specific embodiment, in combination with Figure 3 and Figure 4As shown in the embodiment, the air outlet pipe comprises a first pipe body 102 connected with the air filter 101, and a second pipe body 103 connected with the air inlet. The second pipe body 103 extends along the up-down direction of the vehicle, and the second pipe body 103 has a bending section 1031 bending to the side of the first pipe body 102. The muffler 104 is arranged between the first pipe body 102 and the bending section 1031, and the communication branch 2 is arranged between the bending sections 1031 of the two air outlet pipes.

[0062] In the embodiment, the bending section 1031 arranged on the second pipe body 103 can change the flow direction and speed distribution of the airflow. When the airflow flows through the bending section 1031, the airflow vortex that may exist is further dispersed, so that the airflow enters the air inlet of the engine more uniformly and stably, the intake efficiency is improved, the combustion process of the engine is optimized, and the performance of the engine is comprehensively improved. The muffler 104 is arranged between the air outlet pipe body and the bending section 1031, at this time, the airflow has been preliminarily stabilized by the air filter 101, and the muffler 104 can most effectively process the noise at this critical moment when the airflow characteristics are relatively stable, and the noise reduction effect is maximized. In addition, the communication branch 2 is arranged between the bending sections 1031 of the two air outlet pipes, which fully utilizes the structural characteristics of the bending section 1031 and is beneficial to the pressure balance between the communication branch 2 and the communication branch 2. At the same time, since the airflow noise entering the communication branch 2 is already low, the communication branch 2 will not be disturbed by too much complex noise when performing acoustic resonance adjustment, and can process the target order noise with higher precision, further improving the noise reduction performance of the entire intake system and creating an extremely quiet intake atmosphere for the engine.

[0063] As shown in the embodiment, the air outlet pipe comprises a first pipe body 102 connected with the air filter 101, and a second pipe body 103 connected with the air inlet. The second pipe body 103 extends along the up-down direction of the vehicle, and the second pipe body 103 has a bending section 1031 bending to the side of the first pipe body 102. The muffler 104 is arranged between the first pipe body 102 and the bending section 1031, and the communication branch 2 is arranged between the bending sections 1031 of the two air outlet pipes. Figure 3 and Figure 4 As shown in the embodiment, the air outlet pipe comprises a first pipe body 102 connected with the air filter 101, and a second pipe body 103 connected with the air inlet. The second pipe body 103 extends along the up-down direction of the vehicle, and the second pipe body 103 has a bending section 1031 bending to the side of the first pipe body 102. The muffler 104 is arranged between the first pipe body 102 and the bending section 1031, and the communication branch 2 is arranged between the bending sections 1031 of the two air outlet pipes.

[0064] Furthermore, as a preferred embodiment, the outer diameter of the convex portion 10311 gradually decreases in the direction away from the curved section 1031. In this way, firstly, the gradually decreasing outer diameter can guide and accelerate the airflow. When the airflow flows through the convex portion 10311 after leaving the curved section 1031, due to the gradual change of the channel space, the airflow will automatically adjust the flow rate and flow direction according to the principle of fluid mechanics, so that the airflow more smoothly enters the subsequent intake path, reduces the generation of airflow turbulence and vortex, and thus improves the intake efficiency, ensures that the engine can inhale sufficient and stable air, and ensures the efficient combustion process.

[0065] Secondly, the tapered structure can effectively change the sound wave propagation characteristics. With the gradual decrease of the outer diameter, the reflection and refraction of sound waves in this area change, which helps to disperse and consume part of the noise energy, avoids the concentration of noise reflection in local area, further reduces the noise radiation of the intake system, optimizes the acoustic environment in the vehicle, and improves the driving comfort.

[0066] And by setting the pipe joint 105, the installation and disassembly of the connecting pipe can be made easier, which can improve the work efficiency and reduce the operation difficulty in the manufacturing, assembly and later maintenance process of the intake system. Moreover, the pipe joint 105 is a commonly used and easily accessible part in the technical field, and its specific adoption of existing technology is available. As shown in Figure 5 the pipe joint 105 is generally in a columnar structure, and a plurality of annular protrusions are arranged around the outer wall of the connecting end of the curved section 1031. These annular protrusions are uniformly distributed at intervals, and their role is to tightly embed the annular protrusions in the inner wall groove of the curved section 1031 when the pipe joint 105 is connected with the corresponding mounting part on the curved section 1031 to form a stable mechanical connection, effectively preventing the pipe joint 105 from loosening or displacing due to vibration, airflow impact and other factors during operation.

[0067] In addition, the middle part of the pipe joint 105 is also provided with a flange protruding radially outward, which can abut against the flange when the connecting pipe is inserted and assembled on the pipe joint 105, so as to limit the insertion displacement of the connecting pipe. It can be understood that, in addition to setting the pipe joint 105 and inserting the connecting pipe on the pipe joint 105, the connecting pipe can also be directly welded to the curved section 1031 or connected together with the convex portion 10311 through a clamp or the like.

[0068] In this embodiment, as a preferred embodiment, the connecting pipe adopts a rubber pipe. Because the rubber pipe has good flexibility and elasticity, it can effectively buffer the impact force caused by engine vibration and intake airflow pulsation, and the elastic modulus of the rubber pipe is relatively low, and the flexible structure can change the acoustic characteristics of the connecting branch 2, which is helpful to the natural frequency of the intake structure and avoids the resonance phenomenon during engine operation.

[0069] In addition, as shown in Figure 1 As a preferred embodiment, the connecting pipe of the present embodiment includes a main body section 201 extending along the left-right direction of the vehicle, and a connecting section 202 arranged at both ends of the main body section 201. Moreover, the connecting section 202 at each end is arranged at an obtuse angle with the main body section 201 and is connected to the protruding portion 10311. Among them, the main body section 201 is the core bearing part of the connecting pipe, responsible for ensuring the stable transmission of airflow in the left-right direction, and has good straightness and smooth inner surface to minimize airflow resistance and ensure the efficiency of the air intake process.

[0070] And the connecting section 202 at each end is arranged at an obtuse angle with the main body section 201. On the one hand, the obtuse angle structure can effectively buffer the stress transmission from different directions. When the engine is vibrating, the airflow is impacting, or the vehicle body is shaking, etc. under the action of external force, the connecting section 202 at an obtuse angle can disperse the stress to a larger area by virtue of its unique geometric shape, avoiding stress concentration and causing damage to the connecting part, thereby significantly improving the structural reliability and durability of the connecting pipe as a whole.

[0071] On the other hand, it is also convenient to connect the connecting section 202 to the protruding portion 10311, which is conducive to ensuring the sealing between the connecting pipe and the air intake branch, preventing gas leakage from affecting the engine performance, and further helping to maintain the overall acoustic stability of the intake system, avoiding additional noise due to loose connection, and further optimizing the acoustic environment inside the vehicle, providing a more quiet and comfortable driving experience for the driver and passengers.

[0072] In addition, the second pipe body 103 of the present embodiment preferably adopts a corrugated pipe, which has good flexibility and can effectively buffer engine vibration, avoid pipe rupture or loose connection caused by vibration transmission, ensure the sealing and stability of the intake system, and prolong the service life of the intake system. Moreover, the bending and deforming characteristics of the corrugated pipe make the installation of the intake pipe more flexible in the limited space of the engine compartment. It can adjust its direction according to the position and shape of other components in the engine compartment, and more reasonably arrange the intake pipe.

[0073] Of course, in addition to using a rubber pipe for the connecting pipe and a corrugated pipe for the second pipe body 103, under the premise of meeting the connection arrangement relationship and performance requirements between the above-mentioned components, the connecting pipe and the second pipe body 103 can also be made of other suitable materials respectively to adapt to different application scenarios, cost budget and technical requirements, providing diversified solutions for the engine intake system.

[0074] The engine intake structure of this embodiment, by adopting the above structure, effectively eliminates first-order noise while taking into account its small size and ease of overall arrangement of the intake system. Thus, it can achieve efficient noise control within the limited engine compartment space and effectively solve the problem of limited space arrangement.

[0075] Example 2

[0076] This embodiment relates to an engine system, including an engine and an engine intake structure as described in Embodiment 1 connected to the engine.

[0077] In addition, after experimental verification, such as Figure 6 As shown in the figure, this diagram illustrates the intrinsic correlation between engine speed and the order noise at the air intake. In the engine system of this embodiment, by setting the engine intake structure as detailed in Embodiment 1, extensive experimental data comparison and analysis revealed that this intake structure can significantly and effectively reduce the 1.5th order noise and the 3rd order noise at the engine intake, greatly optimizing the engine's intake acoustic environment.

[0078] in, Figure 6 The double-dotted line clearly represents the trend of the third-order noise at the engine intake as a function of engine speed when the engine system has a connecting pipe. Figure 6 The dotted lines illustrate the relationship between the third-order noise at the engine intake and engine speed when the engine system lacks a connecting pipe. A direct comparison of these two curves clearly shows that, under the same engine speed conditions, the third-order noise at the engine intake is effectively reduced after the connecting pipe is installed. This fully demonstrates the effectiveness of the connecting pipe in suppressing specific order noise, providing strong support for improving engine intake quality.

[0079] Similarly, Figure 6 The dashed line in the diagram illustrates the detailed trend of the 1.5th order noise at the engine intake as engine speed changes, when the engine system has a connecting pipe. Figure 6 The solid line in the figure reflects the original correspondence between the 1.5th order noise at the engine intake and engine speed when the engine system lacks a connecting pipe. Here, from... Figure 6 It is evident that by setting up the connecting pipe, the 1.5th order noise at the engine intake port is significantly reduced, further confirming the effectiveness of the connecting pipe in improving the acoustic characteristics of engine intake, which is beneficial to improving the quietness and stability of the engine during operation.

[0080] In summary, through experimental verification and... Figure 6The interpretation of the above-mentioned data fully proves that the engine intake structure and the communication pipe of the embodiment can reduce the key order noise at the engine air inlet, and is beneficial to the optimization of the engine intake technology.

[0081] The engine system of the embodiment can reduce the noise source in the engine compartment, avoid the transmission of noise into the vehicle to cause acoustic resonance, thereby significantly reducing the booming sound in the vehicle and improving the acoustic comfort in the vehicle.

[0082] Meanwhile, the embodiment also relates to a vehicle provided with the above-mentioned engine system.

[0083] The vehicle of the embodiment can ensure that the engine can stably inhale sufficient and uniform air under various driving conditions through the coordinated operation of the multiple air intake branches in the engine intake structure and the balance of pressure by the communication branch, avoid the power output instability phenomenon caused by air intake fluctuation, and make the vehicle run more smoothly.

[0084] In addition, whether it is the 1.5 order noise generated when the engine runs at a low speed or the 3 order noise, it can be effectively inhibited by the communication pipe, the muffler and the special pipeline layout in the engine intake structure, which can greatly optimize the acoustic environment in the vehicle, create a quiet and comfortable space for the driver and passengers, and improve the riding comfort and quality of the vehicle.

[0085] Furthermore, the engine intake system, such as the second pipe body 103 adopting the corrugated pipe, can buffer the engine vibration and prevent the pipe from breaking or the connection from loosening. Thus, it is beneficial to ensure the sealing and stability of the intake system, thereby indirectly improving the reliability of the vehicle as a whole, reducing the maintenance frequency caused by the failure of the intake system, reducing the use cost, and prolonging the service life of the vehicle. At the same time, the engine system is more compact and does not require a large layout space, which can be arranged in the limited engine compartment space, thereby facilitating the arrangement of other components in the engine compartment and effectively solving the problem of limited space arrangement.

[0086] The above-mentioned is only a preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An engine air intake structure, characterized in that: a plurality of air intake branches (1) are independently arranged, and a communication branch (2) is arranged between at least two of the air intake branches (1); an air outlet of each of the air intake branches (1) is connected to an air inlet of an engine, and the communication branch (2) is arranged at one end of each of the air intake branches (1) close to the air inlet.

2. The engine air intake structure according to claim 1, characterized in that: each of the air intake branches (1) comprises an air cleaner (101), and an air outlet pipe arranged at an outlet of the air cleaner (101); the air outlet pipe of each of the air intake branches (1) is connected to the air inlet, and the communication branch (2) is arranged between two of the air outlet pipes.

3. The engine air intake structure according to claim 2, characterized in that: a silencer (104) is arranged in series on the air outlet pipe, and along a gas flow path in the air outlet pipe, the silencer (104) is arranged upstream of the communication branch (2).

4. The engine air intake structure according to claim 3, characterized in that: the air outlet pipe comprises a first pipe body (102) connected to the air cleaner (101), and a second pipe body (103) connected to the air inlet; the second pipe body (103) extends along a top-bottom direction of the vehicle, and the second pipe body (103) has a bending section (1031) bent to one side of the first pipe body (102), the silencer (104) is arranged between the first pipe body (102) and the bending section (1031), and the communication branch (2) is arranged between the bending sections (1031) of the two air outlet pipes.

5. The engine air intake structure according to claim 4, characterized in that: the bending section (1031) is provided with a convex portion (10311) protruding outward, the convex portion (10311) is provided with a pipe joint (105), and the communication branch (2) comprises a communication pipe inserted into the pipe joint (105).

6. The engine air intake structure according to claim 5, characterized in that: the communication pipe is a rubber pipe; and / or the second pipe body (103) is a corrugated pipe.

7. The engine air intake structure according to claim 1, characterized in that: the air intake branches (1) are two air intake branches (1) arranged opposite to each other in a left-right direction of the vehicle; and the communication branch (2) extends along the left-right direction of the vehicle, and the communication branch (2) is arranged in an "H" shape between the two air intake branches (1).

8. The engine air intake structure according to claim 1, characterized in that: the plurality of air intake branches (1) are of the same structure.

9. An engine system, characterized in that: the engine system comprises an engine, and the engine air intake structure according to any one of claims 1 to 8 connected to the engine.

10. A vehicle, characterized in that: the vehicle is provided with the engine system according to claim 9. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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