Exhaust system and all-terrain vehicle

Abstract

The utility model discloses an exhaust system and an all-terrain vehicle. The exhaust system comprises an exhaust pipe, a silencer and a variable-diameter communicating pipe, the exhaust pipe is arranged in the first direction, the silencer is arranged in the second direction, the second direction is orthogonal to the first direction, the silencer is provided with a first end face and a second end face which are oppositely arranged in the second direction, and the variable-diameter communicating pipe is communicated with the first end face and the second end face. The silencer is located on one side, in the first direction, of the exhaust pipe, the inner diameter of the variable-diameter communicating pipe changes in the extending direction of the variable-diameter communicating pipe, the variable-diameter communicating pipe is provided with an air inlet end and an air outlet end, the air inlet end is connected with the exhaust pipe, the air outlet end is connected with the first end face of the silencer, and the variable-diameter communicating pipe is a bent pipe. According to the exhaust system, the bent reducing communicating pipe is arranged, so that the exhaust system is suitable for a vehicle with a limited space, the length of an exhaust path is increased, the speediness of exhaust is avoided, and noise is reduced.

Description

Exhaust system and all-terrain vehicle Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to an exhaust system and an all-terrain vehicle. Background Technology

[0002] As a mobile device operating under complex conditions, all-terrain vehicles (ATVs) require exhaust systems that control both exhaust emissions and noise. In related technologies, the combination of an exhaust pipe and a muffler is the core structure for achieving these functions. The exhaust pipe guides high-temperature, high-pressure exhaust gases from the engine cylinder head, while the muffler reduces exhaust noise through airflow buffering and sound wave reflection. However, existing exhaust systems occupy a significant amount of space, making them unsuitable for space-constrained ATVs. Summary of the Invention

[0003] This utility model aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of this utility model propose an exhaust system that is suitable for vehicles with limited space.

[0005] An embodiment of this utility model also proposes an all-terrain vehicle.

[0006] The exhaust system of this utility model embodiment includes an exhaust pipe, a muffler, and a variable diameter connecting pipe. The exhaust pipe is arranged along a first direction, and the muffler is arranged along a second direction, which is orthogonal to the first direction. The muffler has a first end face and a second end face arranged opposite to each other in the second direction. The muffler is located on one side of the exhaust pipe in the first direction. The inner diameter of the variable diameter connecting pipe changes along its extension direction. The variable diameter connecting pipe has an inlet end and an outlet end. The inlet end is connected to the exhaust pipe, and the outlet end is connected to the first end face of the muffler. The variable diameter connecting pipe is a curved pipe.

[0007] The exhaust system of this utility model embodiment, by setting a curved variable diameter connecting pipe, is suitable for vehicles with limited space, and increases the length of the exhaust path, avoiding the abruptness of exhaust and reducing noise.

[0008] In some embodiments, the variable diameter connecting pipe is generally U-shaped, and the opening of the U-shape of the variable diameter connecting pipe is arranged in a direction from the first end face of the muffler toward the second end face of the muffler.

[0009] In some embodiments, the variable diameter connecting pipe is generally S-shaped, and the S-shape of the variable diameter connecting pipe has at least two openings, one of which is arranged in a direction from the first end face of the muffler toward the second end face of the muffler, and the other opening is arranged in a direction from the second end face of the muffler toward the first end face of the muffler.

[0010] In some embodiments, the variable diameter connecting pipe includes a first section, a second section, and a third section. The first section is generally U-shaped, and the opening of the U-shape of the first section is arranged in a direction from the first end face of the muffler toward the second end face of the muffler. One end of the first section is connected to one end of the second section, and the other end of the first section is the air outlet. The second section extends in the second direction and is arranged side by side with the muffler in the radial direction of the muffler. The third section extends from the other end of the second section in a direction toward the exhaust pipe, and the end of the third section away from the second section is the air inlet.

[0011] In some embodiments, the muffler has a plurality of mounting brackets on its peripheral wall, the plurality of mounting brackets being arranged at intervals along a second direction, and the mounting brackets and the second segment being arranged at intervals along the circumference of the muffler.

[0012] In some embodiments, the inner diameter of the variable diameter connecting pipe gradually increases along the direction from the air inlet end to the air outlet end, and the ratio of the inner diameter of the air inlet end to the inner diameter of the air outlet end is 0.6 to 0.8.

[0013] In some embodiments, the air intake is located near the muffler at the center in the second direction.

[0014] In some embodiments, the muffler is provided with an exhaust outlet located on the second end face of the muffler.

[0015] In some embodiments, the ratio of the distance between the air inlet and the air outlet in the second direction to the distance between the air inlet and the exhaust outlet in the second direction is 0.5 to 1.

[0016] In some embodiments, the exhaust pipe includes a first pipe section, a second pipe section, and a tee pipe section. The first pipe section and the second pipe section are arranged at intervals along the second direction. The first pipe section and the second pipe section are connected to the third section of the variable diameter connecting pipe through the tee pipe section.

[0017] In some embodiments, the length of the first pipe segment is the same as the length of the second pipe segment.

[0018] The all-terrain vehicle of this utility model embodiment includes a frame and an exhaust system, wherein the exhaust system is the exhaust system described in any of the above embodiments, and the exhaust system is disposed on the frame.

[0019] In some embodiments, the all-terrain vehicle further includes a cab, a cargo box, and an engine, the cab and the cargo box being spaced apart along a first direction and disposed on the frame, the engine being disposed on the frame and located below the cargo box, the exhaust system being located on the side of the engine away from the cab, the exhaust pipe having an intake end connected to the engine, and the muffler being located on the end of the frame away from the cab.

[0020] In some embodiments, the frame is rotatably provided with a rear axle, and the ratio of the distance between the outlet end of the variable diameter connecting pipe and the rear axle in the first direction to the distance between the inlet end of the exhaust pipe and the rear axle in the first direction is 0.6 to 1.

[0021] In some embodiments, the muffler is connected to the vehicle frame via a mounting bracket. Attached Figure Description

[0022] Figure 1 is a first schematic diagram of an all-terrain vehicle according to an embodiment of the present invention.

[0023] Figure 2 is a top view of an all-terrain vehicle according to an embodiment of the present invention.

[0024] Figure 3 is a second schematic diagram of an all-terrain vehicle according to an embodiment of the present invention.

[0025] Figure 4 is a schematic diagram showing the arrangement of the exhaust pipe, the variable diameter connecting pipe, and the rear wheel axle in an embodiment of this utility model.

[0026] Figure 5 is a schematic diagram showing the arrangement relationship between the air inlet and outlet of the variable diameter connecting pipe and the exhaust outlet of the muffler in an embodiment of this utility model.

[0027] Figure 6 is a structural schematic diagram of the exhaust system according to an embodiment of the present invention.

[0028] Figure label:

[0029] 1-Exhaust pipe, 11-First pipe section, 12-Second pipe section, 13-Tee pipe section

[0030] 2-Muffler, 21-Mounting bracket, 211-First mounting bracket, 212-Second mounting bracket, 22-Exhaust outlet

[0031] 3-Reducing diameter connecting pipe, 31-First section, 32-Second section, 33-Third section,

[0032] 100 - Exhaust system, 101 - Chassis, 1011 - Driver's cab area, 1012 - Cargo box area, 1013 - Rear axle, 102 - Engine. Detailed Implementation

[0033] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0034] The exhaust system of this utility model embodiment is described below with reference to the accompanying drawings.

[0035] As shown in Figures 1 to 6, the exhaust system of this embodiment includes an exhaust pipe 1, a muffler 2, and a reducing pipe 3. The exhaust pipe 1 is arranged along a first direction, and the muffler 2 is arranged along a second direction, which is orthogonal to the first direction. The muffler 2 has a first end face and a second end face arranged opposite to each other in the second direction, and the muffler 2 is located on one side of the exhaust pipe 1 in the first direction. The reducing pipe 3 has an inlet end and an outlet end. The inlet end of the reducing pipe 3 is connected to the exhaust pipe 1, and the outlet end of the reducing pipe 3 is connected to the first end face of the muffler 2. The reducing pipe 3 is a curved pipe.

[0036] The first direction can be the front-to-back direction as shown in Figures 1, 2, 4, and 6, and the second direction can be the left-to-right direction as shown in Figures 2, 3, 5, and 6. The first end face of the muffler 2 is the left end face, and the second end face of the muffler 2 is the right end face. The muffler 2 is located behind the exhaust pipe 1.

[0037] In related technologies, the exhaust system of all-terrain vehicles typically features two exhaust structures. One type is a direct combination of the exhaust pipe and muffler, where airflow exits from the engine cylinder head and passes directly into the muffler chamber through a long, straight exhaust pipe. The other type is a combination of the exhaust pipe, a small muffler, and a large muffler, where airflow exits from the engine cylinder head, passes through the exhaust pipe, first enters the small muffler chamber for airflow buffering, and then enters the large muffler chamber.

[0038] The two structures described above are only suitable for vehicles with sufficient space to accommodate them. For vehicles without enough space, neither structure is suitable. For example, in an exhaust system using the first structure, the exhaust pipe is too short, resulting in excessively rapid airflow, which affects the engine's power and torque, especially in terms of exhaust noise and the surface temperature of the muffler chamber.

[0039] In the exhaust system of this utility model embodiment, after the airflow flows out from the exhaust pipe 1, it first passes through the variable diameter connecting pipe 3 before entering the inner cavity of the muffler 2, which slows down the flow rate of the airflow and relatively lengthens the path of the airflow before entering the muffler 2.

[0040] The exhaust system of this embodiment, by incorporating a curved, variable-diameter connecting pipe 3, is suitable for vehicles with limited space, increases the length of the exhaust path, avoids the abruptness of exhaust, and reduces noise. Furthermore, the muffler 2 is positioned perpendicular to the exhaust pipe 1, further minimizing the space occupied by the exhaust system.

[0041] In some embodiments, as shown in Figures 1 to 6, the inner diameter of the variable-diameter connecting pipe 3 varies along its extension direction. For example, the inner diameter of the variable-diameter connecting pipe 3 gradually increases along its extension direction from the air inlet end to the air outlet end, and the ratio of the inner diameter of the air inlet end to the inner diameter of the air outlet end is 0.6 to 0.8.

[0042] The curved design of the variable-diameter connecting pipe 3 extends the exhaust path, while the increased inner diameter further extends the equivalent airflow path. The combined effect significantly reduces the swiftness of the airflow. Through the gradual change in cross-section, the airflow energy can be effectively dispersed, reducing the impact of high-speed airflow on the muffler 2, thereby reducing noise.

[0043] Rapidly changing airflow velocities can generate pressure waves in pipes, leading to system vibration or mechanical fatigue. The gradually expanding inner diameter design of the variable-diameter connecting pipe 3 can smooth the airflow pressure distribution, reduce the impact of pressure fluctuations on the silencer 2, and extend the equipment's lifespan.

[0044] The ratio of the inner diameter of the air inlet to the inner diameter of the air outlet is preferably limited to a range of 0.6 to 0.8. For example, the ratio is 0.6, 0.7, or 0.8. If the ratio is too small (e.g., less than 0.6), the inner diameter of the air outlet will be too large, which may cause a sudden drop in airflow velocity, leading to airflow separation and increasing noise and resistance. If the ratio is too large (e.g., greater than 0.8), the inner diameter of the air outlet will increase too slowly, which may not effectively reduce the airflow velocity, resulting in insufficient noise reduction.

[0045] In some embodiments, as shown in Figures 3, 5, and 6, the air inlet end of the variable diameter connecting pipe 3 is adjacent to the middle of the muffler 2 in the second direction. The muffler 2 has a symmetrical structure in the left-right direction (second direction), and the air inlet end of the variable diameter connecting pipe 3 being close to its middle can avoid additional space occupation due to offset.

[0046] The transmission system, suspension system, and other components of an all-terrain vehicle are usually densely arranged in the space on the left and right sides of the vehicle. If the intake end of the variable diameter connecting pipe 3 is off-center from the muffler 2, it may cause the pipe to collide or interfere with these components. Positioning the intake end of the variable diameter connecting pipe 3 in the center of the muffler 2 ensures that the connection point between the variable diameter connecting pipe 3 and the exhaust pipe 1 and the muffler 2 is roughly on the centerline of the vehicle, reducing the space occupied on the left and right sides and avoiding layout conflicts caused by offset.

[0047] In some embodiments, as shown in Figures 1 to 5, the muffler 2 is provided with an exhaust outlet 22, which is located on the second end face of the muffler 2. The outlet end of the variable diameter connecting pipe 3 is connected to the left end face (first end face) of the muffler 2, forming a symmetrical path with the exhaust outlet 22 on the right end face (second end face) of the muffler 2, ensuring that the airflow is evenly distributed within the chamber of the muffler 2. Furthermore, compared to the peripheral wall of the muffler 2, it is more convenient and feasible to perform processing, sealing, and structural connections on the end face.

[0048] Optionally, as shown in Figure 5, the distance between the air inlet end and the air outlet end of the variable diameter connecting pipe 3 in the second direction is L3, and the distance between the air inlet end of the variable diameter connecting pipe 3 and the exhaust outlet 22 of the muffler 2 in the second direction is L4, with the ratio of L3 to L4 being 0.5 to 1.

[0049] The ratio of L3 to L4 is preferably limited to a range of 0.5 to 1, for example, a ratio of 0.5, 0.6, 0.7, 0.8, 0.9, or 1. This avoids a sudden drop in flow velocity due to an excessively long path, and the design of the bend and gradually widening inner diameter of the variable-diameter connecting pipe 3 smooths the airflow velocity and reduces abruptness. If the ratio is too small (e.g., less than 0.5), the variable-diameter connecting pipe 3 is too short, the airflow velocity is too high, the pressure fluctuation is severe, and the silencing effect is insufficient. If the ratio is too large (e.g., greater than 1), the variable-diameter connecting pipe 3 is too long, the airflow velocity is too low, the pressure fluctuation increases, and the silencing effect decreases.

[0050] The exhaust system of one embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0051] As shown in Figures 1 to 6, the exhaust system of this embodiment includes an exhaust pipe 1, a muffler 2, and a reducing connecting pipe 3. The reducing connecting pipe 3 is generally U-shaped, and the opening of the U-shape of the reducing connecting pipe 3 is arranged in a direction from the first end face of the muffler 2 toward the second end face of the muffler 2. That is, the U-shaped opening of the reducing connecting pipe 3 is arranged to the right.

[0052] The muffler 2 has a columnar structure. The variable diameter connecting pipe 3 can be connected to the end cap of the muffler 2 through a U-shaped bend structure around the muffler 2, so that the variable diameter connecting pipe 3 can be flexibly arranged in a limited space, reducing the space occupied in the front and rear directions of the vehicle and extending the path of airflow before entering the muffler 2.

[0053] In some embodiments, as shown in FIG6, the variable diameter connecting pipe 3 includes a first segment 31, a second segment 32 and a third segment 33.

[0054] The first section 31 is roughly U-shaped, with the U-shaped opening facing to the right. The upper end of the first section 31 is the outlet of the variable diameter connecting pipe 3, and the upper end of the first section 31 is welded to the left end cap of the silencer 2 as an integral structure.

[0055] The lower end of the first section 31 is connected to the left end of the second section 32. The second section 32 extends in the left-right direction and is arranged side by side with the muffler 2 in the radial direction of the muffler 2. The second section 32 is a pipe section that extends the path of the airflow before entering the muffler 2. Optionally, the second section 32 is located below the muffler 2 to avoid interference with the connection structure (mounting bracket 21) of the muffler 2.

[0056] The third section 33 extends from the right end of the second section 32 towards the exhaust pipe 1, with the end of the third section 33 furthest from the second section 32 serving as the intake end of the reducing connecting pipe 3. Optionally, the third section 33 is inclined from back to front and from bottom to top. The upper end of the third section 33 is sealed and fastened to the exhaust end of the exhaust pipe 1 using bolts, springs, and graphite sleeves to ensure the stability and sealing of the connection between the two.

[0057] In some embodiments, as shown in Figures 2 and 6, the exhaust pipe 1 includes a first pipe section 11, a second pipe section 12, and a tee pipe section 13. The first pipe section 11 and the second pipe section 12 are arranged at intervals along a second direction. The first pipe section 11 and the second pipe section 12 are connected to the third section 33 of the variable diameter connecting pipe 3 through the tee pipe section 13.

[0058] The exhaust pipe 1 can be used in a twin-cylinder engine 102. The two cylinders of the twin-cylinder engine 102 will exhaust alternately when working. The first pipe section 11 and the second pipe section 12 are independently connected to the two cylinders, guiding their respective exhausts. Finally, the two independent exhaust paths are merged through the three-way pipe section 13.

[0059] Optionally, as shown in Figures 2 and 6, the length of the first pipe section 11 is the same as the length of the second pipe section 12, so that the exhaust paths of the two cylinders are symmetrically distributed, avoiding uneven airflow speed or pressure fluctuations caused by path differences.

[0060] In some embodiments, as shown in Figures 1, 2, 3, and 6, the peripheral wall of the muffler 2 is provided with a plurality of mounting brackets 21, which are spaced apart along a second direction. The mounting brackets 21 and the second section 32 of the reducing diameter connecting pipe 3 are spaced apart along the circumference of the muffler 2. The mounting brackets 21 are used to fix the muffler 2, and the spaced arrangement of the mounting brackets 21 and the reducing diameter connecting pipe 3 is to avoid structural interference between the two.

[0061] Optionally, the mounting bracket 21 is positioned above the muffler 2 to avoid interference with the reducing connecting pipe 3 below the muffler 2. The plurality of mounting brackets 21 includes a first mounting bracket 211 and a second mounting bracket 212, with the first mounting bracket 211 located to the left of the second mounting bracket 212.

[0062] The exhaust system of another embodiment of this utility model is described in detail below.

[0063] The exhaust system of this embodiment includes an exhaust pipe 1, a muffler 2, and a reducing connecting pipe 3. The reducing connecting pipe 3 is generally S-shaped, and the S-shape of the reducing connecting pipe 3 has at least two openings. One opening is arranged along the direction from the first end face of the muffler 2 towards the second end face of the muffler 2, and the other opening is arranged along the direction from the second end face of the muffler 2 towards the first end face of the muffler 2. The reducing connecting pipe 3 can be connected to the end cap of the muffler 2 around the periphery of the muffler 2 through an S-shaped bending structure.

[0064] The following describes an embodiment of the all-terrain vehicle of this utility model with reference to the accompanying drawings.

[0065] As shown in Figures 1 to 6, the all-terrain vehicle of this utility model embodiment includes a frame 101 and an exhaust system. The exhaust system is the exhaust system 100 in any of the above embodiments, and the exhaust system 100 is disposed on the frame 101.

[0066] The all-terrain vehicle of this utility model, by setting up a combination structure of exhaust pipe 1, muffler 2 and bent variable diameter connecting pipe 3, avoids the problem of insufficient exhaust path length caused by the limitation of the whole vehicle space, and also avoids the abruptness of exhaust, thus reducing noise.

[0067] In some embodiments, as shown in Figures 1 to 6, the all-terrain vehicle further includes a driver's cab, a cargo box, and an engine 102, which are not shown in the figures. The frame 101 has a driver's cab area 1011 and a cargo box area 1012 spaced apart in a longitudinal direction. The driver's cab is located in the driver's cab area 1011, and the cargo box is located in the cargo box area 1012. The engine 102 is mounted on the frame 101 and located below the cargo box.

[0068] The exhaust system 100 is located on the side of the engine 102 away from the driver's compartment. The exhaust pipe 1 has an intake end, which is fastened to the engine 102 by cylinder head bolts and cap nuts. The muffler 2 is located at the end of the frame 101 away from the driver's compartment, and the mounting bracket 21 of the muffler 2 is fastened to the frame 101 by bolts.

[0069] The exhaust gas from engine 102 enters the variable diameter connecting pipe 3 through exhaust pipe 1 (each exhaust pipe 1 has an oxygen sensor to monitor the working status of each cylinder of engine 102) for sufficient expansion and buffering, reducing the flow rate, and then enters muffler 2 before being discharged through exhaust outlet 22.

[0070] When repairing or replacing the muffler 2, simply remove the bolts and springs connecting the reducing pipe 3 and the exhaust pipe 1 from the rear of the vehicle, and then remove the mounting bracket 21 between the muffler 2 and the frame 101 to remove the muffler 2 and the reducing pipe 3. When repairing the exhaust pipe 1, in addition to the steps for removing the muffler 2, simply raise the cargo box and then remove the cylinder head cap nut to remove the exhaust pipe 1.

[0071] The exhaust system 100 is located in the middle and rear of the all-terrain vehicle. The exhaust pipe 1 is located below the cargo box, the variable diameter connecting pipe 3 is located below the rear of the cargo box, and the muffler is located in the middle of the rear of the vehicle. This reduces the impact of heat damage to the cab and plastic and rubber parts, and also improves the ease of maintenance of the exhaust system 100. It can be removed by raising the cargo box.

[0072] The muffler 2 is located at the rear of the vehicle and is arranged laterally. The variable diameter connecting pipe 3 is connected to the left end cap of the muffler 2 to ensure the maximization of the airflow discharge path.

[0073] In some embodiments, as shown in FIG4, the frame 101 is rotatably provided with a rear wheel axle 1013, the distance between the outlet end of the variable diameter connecting pipe 3 and the rear wheel axle 1013 in the first direction is L1, the distance between the inlet end of the exhaust pipe 1 and the rear wheel axle 1013 in the first direction is L2, and the ratio of L1 to L2 is 0.6 to 1.

[0074] The ratio of L1 to L2 is preferably limited to a range of 0.6 to 1, for example, a ratio of 0.6, 0.7, 0.8, 0.9, or 1. The exhaust path length is optimized to balance airflow velocity and noise reduction, avoiding performance loss due to excessively short or long paths. Adapting to the compact layout of all-terrain vehicles, a highly efficient and stable exhaust system 100 is achieved within a limited space. This layout also improves ease of maintenance, reduces the impact of heat on the vehicle body, and lowers noise levels.

[0075] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0076] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0077] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0078] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0079] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0080] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An exhaust system, characterized in that, include: An exhaust pipe is arranged along a first direction; a muffler is arranged along a second direction, the second direction being orthogonal to the first direction, the muffler having a first end face and a second end face arranged opposite to each other in the second direction, the muffler being located on one side of the exhaust pipe in the first direction; a variable diameter connecting pipe has an inner diameter that varies along its extension direction, the variable diameter connecting pipe having an inlet end and an outlet end, the inlet end being connected to the exhaust pipe, the outlet end being connected to the first end face of the muffler, the variable diameter connecting pipe being a curved pipe.

2. The exhaust system according to claim 1, characterized in that, The variable diameter connecting pipe is generally U-shaped, and the opening of the U-shape of the variable diameter connecting pipe is arranged in the direction from the first end face of the muffler toward the second end face of the muffler.

3. The exhaust system according to claim 1, characterized in that, The variable diameter connecting pipe is generally S-shaped, and the S-shape of the variable diameter connecting pipe has at least two openings, one of which is arranged in the direction from the first end face of the muffler toward the second end face of the muffler, and the other opening is arranged in the direction from the second end face of the muffler toward the first end face of the muffler.

4. The exhaust system according to claim 1, characterized in that, The variable diameter connecting pipe includes a first section, a second section, and a third section. The first section is generally U-shaped, and the opening of the U-shape of the first section is arranged in a direction from the first end face of the muffler toward the second end face of the muffler. One end of the first section is connected to one end of the second section, and the other end of the first section is the air outlet. The second section extends in the second direction and is arranged side by side with the muffler in the radial direction of the muffler. The third section extends from the other end of the second section toward the exhaust pipe, and the end of the third section away from the second section is the air inlet.

5. The exhaust system according to claim 4, characterized in that, The muffler is provided with a plurality of mounting brackets on its peripheral wall. The plurality of mounting brackets are arranged at intervals along the second direction. The mounting brackets and the second segment are arranged at intervals along the circumference of the muffler.

6. The exhaust system according to claim 1, characterized in that, The inner diameter of the variable-diameter connecting pipe gradually increases from the air inlet end to the air outlet end, and the ratio of the inner diameter of the air inlet end to the inner diameter of the air outlet end is 0.6 to 0.

8.

7. The exhaust system according to claim 1, characterized in that, The air intake end is located near the muffler in the middle of the second direction.

8. The exhaust system according to claim 1, characterized in that, The muffler is provided with an exhaust outlet, which is located on the second end face of the muffler.

9. The exhaust system according to claim 8, characterized in that, The ratio of the distance between the air inlet and the air outlet in the second direction to the distance between the air inlet and the exhaust outlet in the second direction is 0.5 to 1.

10. The exhaust system according to claim 4, characterized in that, The exhaust pipe includes a first pipe section, a second pipe section, and a tee pipe section. The first pipe section and the second pipe section are arranged at intervals along the second direction. The first pipe section and the second pipe section are connected to the third section of the variable diameter connecting pipe through the tee pipe section.

11. The exhaust system according to claim 10, characterized in that, The length of the first pipe segment is the same as the length of the second pipe segment.

12. An all-terrain vehicle, characterized in that, include: Frame; An exhaust system, wherein the exhaust system is the exhaust system according to any one of claims 1-11, and the exhaust system is disposed on the vehicle frame.

13. The all-terrain vehicle according to claim 12, characterized in that, Also includes: The vehicle includes a cab and a cargo box, which are spaced apart along a first direction and mounted on the chassis; an engine mounted on the chassis and located below the cargo box; an exhaust system located on the side of the engine away from the cab; an exhaust pipe having an intake end connected to the engine; and a muffler located on the side of the chassis away from the cab.

14. The all-terrain vehicle according to claim 12, characterized in that, The frame is rotatably provided with a rear wheel axle, and the ratio of the distance between the outlet end of the variable diameter connecting pipe and the rear wheel axle in the first direction to the distance between the inlet end of the exhaust pipe and the rear wheel axle in the first direction is 0.6 to 1.

15. The all-terrain vehicle according to claim 12, characterized in that, The muffler is connected to the vehicle frame via a mounting bracket.

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