Exhaust manifold, exhaust system and vehicle

Abstract

The invention relates to an exhaust manifold, an exhaust system and a vehicle, the exhaust manifold comprises an exhaust main pipe and a first branch pipe, the first branch pipe comprises a first branch part and a first transition pipe, the first branch part communicates with the exhaust main pipe through the first transition pipe, and the direction perpendicular to a mounting reference surface of the first branch pipe is defined as the projection direction A; the second branch pipe comprises a second branch part and a second transition pipe, the second branch part is communicated with the exhaust main pipe through the second transition pipe, and the length size of the second branch part is larger than that of the first branch part; in the projection direction A, a first included angle theta 1 is formed between the center line of the first transition pipe and the main center line of the main exhaust pipe, a second included angle theta 2 is formed between the center line of the second transition pipe and the main center line of the main exhaust pipe, and the first included angle theta 1 is smaller than the second included angle theta 2. The exhaust manifold solves the problem that pressure differences exist among branch pipes in an existing exhaust manifold, and effectively avoids the problems that exhaust pulses are disordered, and horsepower and torsion output of an engine is low.

Description

Technical Field

[0001] This application relates to the field of exhaust manifolds, and more particularly to an exhaust manifold, an exhaust system, and a vehicle. Background Technology

[0002] In automotive exhaust systems, the most important design consideration for the exhaust manifold is to avoid chaotic exhaust pulses between cylinders, ensuring that the turbine blades on the exhaust side are subjected to measured, smooth, and continuous pressure. Furthermore, due to space constraints within the engine, the branch pipes of existing exhaust manifolds are generally S-shaped twists. This facilitates the design of the branch pipe's size and structure, reducing pressure differences between the branch pipes during operation. This significantly improves the turbine's operating speed limit, efficiency, and stability, thereby increasing boost pressure.

[0003] Generally, in a car engine, theoretically, the firing order and timing of each cylinder are the same. However, since the branch pipes of the exhaust manifold are of varying lengths, the exhaust efficiency of each cylinder will inevitably differ. This not only reduces cylinder efficiency but also affects the smoothness of exhaust flow, i.e., the exhaust resistance inside the exhaust pipe. The magnitude of exhaust resistance is closely related to factors such as the diameter of the exhaust pipe. Therefore, pressure differences exist between the branch pipes in existing exhaust manifolds, leading to disordered exhaust pulses and reduced engine horsepower and torque output. Summary of the Invention

[0004] This application provides an exhaust manifold, an exhaust system, and a vehicle, which solves the problem of pressure differences between the branch pipes in existing exhaust manifolds, effectively avoiding exhaust pulse disorder and low engine horsepower and torque output.

[0005] To achieve the above objectives, according to a first aspect of this application, an exhaust manifold is provided, comprising:

[0006] Exhaust main; and

[0007] The first branch pipe includes a first branch portion and a first transition pipe. The first branch portion is connected to the exhaust main pipe through the first transition pipe. The direction perpendicular to the mounting reference plane of the first branch pipe is defined as the projection direction A.

[0008] The second branch pipe includes a second branch section and a second transition pipe. The second branch section is connected to the exhaust main pipe through the second transition pipe. The length of the second branch section is longer than the length of the first branch section.

[0009] In the projection direction A, a first angle θ1 is formed between the centerline of the first transition pipe and the main centerline of the exhaust pipe, and a second angle θ2 is formed between the centerline of the second transition pipe and the main centerline of the exhaust pipe. The first angle θ1 is smaller than the second angle θ2.

[0010] Optionally, the first included angle θ1 is an acute angle, and the second included angle θ2 is an obtuse angle.

[0011] Optionally, the first included angle θ1 ranges from 70° to 80°, and the second included angle θ2 ranges from 120° to 135°.

[0012] Optionally, the first branch pipe further includes a first flange disposed at the end of the first branch portion away from the first transition pipe, and the second branch pipe further includes a second flange disposed at the end of the second branch portion away from the second transition pipe, wherein the flange face of the first flange is the mounting reference surface of the first branch pipe.

[0013] In the projection direction A, the distance between the first flange and the exhaust pipe is less than the distance between the second flange and the exhaust pipe.

[0014] Optionally, the first branch includes a first branch pipe and a second branch pipe, both of which converge at the first transition pipe and are connected to the first transition pipe.

[0015] Optionally, the second branch includes a third branch pipe and a fourth branch pipe, both of which converge at the second transition pipe and are connected to the second transition pipe.

[0016] Optionally, the first branch pipe includes a first inner pipe body and a first heat insulation body disposed on the outside of the first inner pipe body;

[0017] And / or, the second branch pipe includes a second inner pipe body and a second heat insulation body disposed outside the second inner pipe body.

[0018] Optionally, the first branch pipe is provided with a first assembly slot for installing a first sensor, and the first assembly slot is connected to the first branch pipe; the second branch pipe is provided with a second assembly slot for installing a second sensor, and the second assembly slot is connected to the second branch pipe.

[0019] According to a second aspect of this application, an exhaust system is provided, including an exhaust manifold as described above.

[0020] Optionally, the exhaust system includes an engine and a turbocharger, with the main exhaust pipe of the exhaust manifold detachably mounted to the turbocharger, and both the first branch pipe and the second branch pipe of the exhaust manifold detachably mounted to the engine.

[0021] According to a third aspect of this application, a vehicle is also provided, including the exhaust system described above.

[0022] In the exhaust manifold of this application embodiment, by adjusting the first angle θ1 formed between the centerline of the first transition pipe and the main centerline of the exhaust main pipe, and the second angle θ2 formed between the centerline of the second transition pipe and the main centerline of the exhaust main pipe, the exhaust pressure loss generated by the first angle θ1 combined with the length of the first branch pipe can be balanced with the exhaust pressure loss generated by the second angle θ2 combined with the length of the second branch pipe. This effectively solves the problem of pressure difference between each branch pipe in the existing exhaust manifold, ensures the uniformity of exhaust inside the exhaust manifold, and effectively avoids the problem of chaotic exhaust pulses and low engine horsepower and torque output.

[0023] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the 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.

[0025] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0026] Figure 1 This is a schematic diagram of the first structure of the exhaust manifold provided in an exemplary embodiment of this disclosure;

[0027] Figure 2 yes Figure 1 An enlarged schematic diagram of part A in the middle.

[0028] Figure 3 This is a schematic diagram of the second structure of the exhaust manifold provided in an exemplary embodiment of this disclosure;

[0029] Figure 4 This is a projection diagram of the center curve of the exhaust manifold provided in an exemplary embodiment of this disclosure;

[0030] Figure 5 Based on Figure 4Projection diagram of the center lines of each branch pipe of the exhaust manifold in projection direction A.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. First branch pipe; 11. First branch section; 111. First branch body; 112. Second branch body; 12. First transition pipe; 13. First inner pipe body; 14. First heat insulation body; 15. First assembly groove; 16. First flange;

[0033] 2. Second branch pipe; 21. Second branch section; 211. Third branch pipe body; 212. Fourth branch pipe body; 22. Second transition pipe; 25. Second assembly groove; 26. Second flange;

[0034] 3. Exhaust main pipe; 31. Exhaust flange. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0036] This application provides an exhaust manifold; please refer to [link / reference]. Figure 1 and Figure 3 , Figure 1 This is a first structural schematic diagram of the exhaust manifold provided in an embodiment of this application. Figure 3 This is a schematic diagram of the second structure of the exhaust manifold provided in an exemplary embodiment of this disclosure.

[0037] The exhaust manifold includes a main exhaust pipe 3, a first branch pipe 1, and a second branch pipe 2. The first branch pipe 1 includes a first branch section 11 and a first transition pipe 12. The first branch section 11 is connected to the main exhaust pipe 3 through the first transition pipe 12. That is, both the first branch section 11 and the main exhaust pipe 3 are smoothly connected to the first transition pipe 12 to ensure smooth gas flow. The second branch pipe 2 includes a second branch section 21 and a second transition pipe 22. The second branch section 21 is connected to the main exhaust pipe 3 through the second transition pipe 22. That is, both the second branch section 21 and the main exhaust pipe 3 are smoothly connected to the second transition pipe 22 to ensure smooth gas flow.

[0038] Understandably, please refer to the specifics. Figures 1 to 3As shown, the end of the first transition pipe 12 near the exhaust main pipe 3 intersects with the end of the second transition pipe 22 near the exhaust main pipe 3, and both the first transition pipe 12 and the second transition pipe 22 are fixedly connected to the exhaust main pipe 3. This fixed connection can be either welded or integrally formed to ensure the overall stability of the exhaust manifold structure. Airflow can flow between the exhaust main pipe 3 and the first transition pipe 12 of the first branch pipe 1, and between the exhaust main pipe 3 and the second transition pipe 22 of the second branch pipe 2; that is, the gas flowing through the first branch pipe 1 and the second branch pipe 2 can converge and flow into the exhaust main pipe 3.

[0039] In addition, please refer to the specific details. Figures 1 to 3 As shown, the first branch pipe 1 further includes a first flange 16, which is located at the end of the first branch 11 away from the first transition pipe 12. The first flange 16 is fixedly connected to the first branch 11. This fixed connection can be either a welded connection or an integrally formed connection. The first flange 16 is used for mounting connection with the cylinder block of the first engine. The second branch pipe 2 further includes a second flange 26, which is located at the end of the second branch 21 away from the second transition pipe 22. The second flange 26 is fixedly connected to the second branch 21. This fixed connection can be either a welded connection or an integrally formed connection. The second flange 26 is used for mounting connection with the cylinder block of the second engine.

[0040] For example, please refer to the following: Figure 4 and Figure 5 , Figure 4 This is a projection diagram of the center curve of the exhaust manifold provided in an exemplary embodiment of this disclosure. Figure 5 Based on Figure 4 Projection view of the center lines of each branch pipe of the exhaust manifold in projection direction A. Driven by the first and second engines, gas flows into the first branch 11 and the second branch 21, forming an airflow. Guided by the first transition pipe 12 and the second transition pipe 22, the airflow converges into the main exhaust pipe 3. An exhaust flange 31 is provided at the end of the main exhaust pipe 3. The exhaust flange 31 is used for connection to the turbocharger, so the airflow is pressurized by the turbocharger and then exits the main exhaust pipe 3.

[0041] In this embodiment, please refer to the specific details. Figure 5 As shown, the length of the first branch 11 is smaller than the length of the second branch 21. Therefore, the shorter length of the first branch 11 results in lower exhaust pressure loss, thus lower exhaust pressure loss in the first branch pipe 1, meaning lower gas pressure loss. Conversely, the longer length of the second branch 21 results in higher exhaust pressure loss, thus higher exhaust pressure loss in the second branch pipe 2, meaning higher gas pressure loss.

[0042] The core of this application is that the direction perpendicular to the mounting reference plane of the first branch pipe 1 is defined as the projection direction A, and the mounting reference plane here is the flange face of the first flange 16. In the projection direction A, the center line of the first transition pipe 12 and the main center line of the exhaust main pipe 3 form a first angle θ1, and the center line of the second transition pipe 22 and the main center line of the exhaust main pipe 3 form a second angle θ2.

[0043] It should be noted that the centerline of the first transition pipe 12 is perpendicular to the central axis of the cross-section of the first end of the first transition pipe 12, which is the end of the first transition pipe 12 used to connect to the first branch 11. The centerline of the second transition pipe 22 is perpendicular to the central axis of the cross-section of the second end of the second transition pipe 22, which is the end of the second transition pipe 22 used to connect to the second branch 21.

[0044] With this configuration, when both the first included angle θ1 and the second included angle θ2 are between 0° and 90°, since the first included angle θ1 is smaller than the second included angle θ2, the increased exhaust pressure loss of the first branch pipe 1 is greater than the increased exhaust pressure loss of the second branch pipe 2, until the exhaust pressure loss of the first branch pipe 1 and the exhaust pressure loss of the second branch pipe 2 are balanced. This allows the airflow to converge at a more uniform pressure in the exhaust main pipe 3, thereby improving the uniformity of exhaust.

[0045] Alternatively, when both the first included angle θ1 and the second included angle θ2 are between 90° and 180°, since the first included angle θ1 is smaller than the second included angle θ2, the reduced exhaust pressure loss of the first branch pipe 1 is smaller than the reduced exhaust pressure loss of the second branch pipe 2, until the exhaust pressure loss of the first branch pipe 1 is balanced with the exhaust pressure loss of the second branch pipe 2. This allows the airflow to converge at the pressure of the exhaust main pipe 3 to be more uniform, thereby improving the uniformity of exhaust.

[0046] Alternatively, when the first included angle θ1 is between 0° and 90°, and the second included angle θ2 is between 90° and 180°, that is, when the first included angle θ1 between the centerline of the first transition pipe 12 and the main centerline of the exhaust pipe 3 is set to an acute angle, and the second included angle θ2 between the centerline of the second transition pipe 22 and the main centerline of the exhaust pipe 3 is set to an obtuse angle, the exhaust pressure loss of the first branch pipe 1 can be increased, while the exhaust pressure loss of the second branch pipe 2 can be reduced. This allows for a faster and more effective balance between the exhaust pressure losses of the first branch pipe 1 and the second branch pipe 2, resulting in a more uniform pressure at which the airflow converges in the exhaust pipe 3, thus improving the uniformity of the exhaust.

[0047] In summary, this application cleverly utilizes the bending angles formed between the branch pipes of the exhaust manifold and the main exhaust pipe 3, as well as the lengths of the branch pipes of the exhaust manifold, to effectively solve the problem of pressure differences between the branch pipes in the existing exhaust manifold without changing the lengths of the branch pipes. This ensures the uniformity of exhaust flow inside the exhaust manifold and effectively avoids the problems of chaotic exhaust pulses and low engine horsepower and torque output.

[0048] In addition to adjusting the bending angle to regulate the exhaust pressure loss of the first branch pipe 1 and the second branch pipe 2, thereby improving exhaust uniformity, it is understood that the first opening of the first branch pipe 1 and the second opening of the second branch pipe 2 can also be offset and independently set. This offset distribution can be chosen such that both the first opening of the first branch pipe 1 and the second opening of the second branch pipe 2 are offset to the same side of the main exhaust pipe 3, or it can be chosen such that the first opening of the first branch pipe 1 and the second opening of the second branch pipe 2 are offset to opposite sides of the main exhaust pipe 3. This allows for adjustments to the first branch pipe 1 and the second branch pipe 2 according to the available space, improving the flexibility of the assembly design and the convenience of the exhaust system during assembly. It is not limited by the available space, nor by the length dimensions of the first branch pipe 1 and the second branch pipe 2, greatly improving the adaptability of the exhaust manifold and reducing the processing precision required for the exhaust manifold.

[0049] Of course, in the projection direction A, the distance between the first flange 16 and the exhaust pipe 3 is less than the distance between the second flange 26 and the exhaust pipe 3. That is, the first flange 16 will be closer to the exhaust pipe 3 than the second flange 26, so as to better fit the arrangement of the engine block.

[0050] It should be noted that a first angle θ1 is defined between the first centerline of the first branch pipe 1 and the main centerline of the exhaust main pipe 3. The angle range of the first angle θ1 is 70° to 80°. Within this angle range, the first branch pipe 1 has a significant impact on gas pressure loss, and the gas pressure loss increases with the increase of the bend angle. When the first angle θ1 is greater than the 70° to 80° angle range, the first angle θ1 between the first centerline of the first branch pipe 1 and the main centerline of the exhaust main pipe 3 is too large, which not only results in excessive gas pressure loss and significant loss of gas flow energy, but also causes significant stress concentration at the connection point between the first branch pipe 1 and the exhaust main pipe 3. When the first angle θ1 is less than the 70° to 80° angle range, the effect of the first branch pipe 1 on regulating gas pressure loss within this angle range will be greatly reduced. Preferably, the first angle θ1 between the first centerline of the first branch pipe 1 and the main centerline of the exhaust main pipe 3 is 75° and 78°.

[0051] It should also be noted that a second angle θ2 is formed between the second centerline of the second branch pipe 2 and the main centerline of the exhaust main pipe 3. The angle θ2 ranges from 120° to 135°. Within this angle range, the second branch pipe 2 can significantly reduce gas pressure loss. However, if the second angle θ2 is greater than the range of 120° to 135°, the angle θ2 between the second centerline of the second branch pipe 2 and the main centerline of the exhaust main pipe 3 is too large, resulting in excessive reduction of gas pressure loss and hindering the adjustment of gas pressure loss in the second branch pipe 2. Conversely, if the second angle θ2 is less than the range of 120° to 135°, the reduction in gas pressure loss within this angle range is not significant, also hindering the adjustment of gas pressure loss in the second branch pipe 2. Preferably, the second angle θ2 between the second centerline of the second branch pipe 2 and the main centerline of the exhaust main pipe 3 is 125°, 127°, or 130°.

[0052] In some cases, please refer to the specific details. Figure 5 As shown, the first branch 11 includes a first branch pipe body 111 and a second branch pipe body 112. Both the first branch pipe body 111 and the second branch pipe body 112 converge at the first transition pipe 12. Both the first branch pipe body 111 and the second branch pipe body 112 are smoothly connected to the first transition pipe 12, and both the first branch pipe body 111 and the second branch pipe body 112 are connected to the first transition pipe 12. The end of the first branch pipe body 111 away from the first transition pipe 12 and the end of the second branch pipe body 112 away from the first transition pipe 12 are both fixedly connected to the first flange 16.

[0053] With this configuration, the first branch pipe 111 and the second branch pipe 112 intersect to form an angle, allowing gas to converge from both pipes into the first transition pipe 12. A third angle θ3 is defined between the centerline of the first branch pipe 111 and the centerline of the second branch pipe 112, with the angle θ3 ranging from 10° to 90°. It should be noted that the centerline of the first branch pipe 111 is the central axis of the end of the first branch pipe 111 closest to the first transition pipe 12, and the centerline of the second branch pipe 112 is the central axis of the end of the second branch pipe 112 closest to the first transition pipe 12.

[0054] After the exhaust manifold is assembled and the angles of the first and second branches are adjusted, there is still a slight deviation in the gas pressure drop generated by the first branch pipe 1 and the second branch pipe 2. At this time, the curvature of the first branch pipe body 111 and the second branch pipe body 112 can be changed by changing the angle of the third branch pipe 3, thereby fine-tuning the gas pressure drop generated by the first branch pipe 1. This allows the gas pressure drop generated by the first branch pipe 1 to be better balanced with the gas pressure drop generated by the second branch pipe 2, achieving better exhaust uniformity of the exhaust manifold.

[0055] For example, such as Figure 5 As shown, when the gas pressure loss generated by the first branch pipe 1 is small, the angle θ3 of the third included angle can be adjusted to be smaller. Then, the converging position between the first branch pipe body 111 and the second branch pipe body 112 will be slightly shifted to the right. This is equivalent to the airflow separation effect at the converging position between the first branch pipe body 111 and the second branch pipe body 112 becoming worse. At this time, the airflow is prone to cross-flow and generate turbulence, which causes the gas pressure loss of the first branch pipe 1 to increase slightly.

[0056] In some cases, please refer to the specific details. Figure 5 As shown, the second branch 21 includes a third branch pipe 211 and a fourth branch pipe 212. Both the third branch pipe 211 and the fourth branch pipe 212 converge at the second transition pipe 22. Both the third branch pipe 211 and the fourth branch pipe 212 are smoothly connected to the second transition pipe 22, and both are connected to the second transition pipe 22. The end of the third branch pipe 211 away from the second transition pipe 22 and the end of the fourth branch pipe 212 away from the second transition pipe 22 are both fixedly connected to the second flange 26.

[0057] With this configuration, the third branch pipe 211 and the fourth branch pipe 212 intersect to form an angle, allowing gas to converge from both pipes into the second transition pipe 22. A fourth angle θ4 is defined between the centerline of the third branch pipe 211 and the centerline of the fourth branch pipe 212, ranging from 10° to 90°. It should be noted that the centerline of the third branch pipe 211 is the central axis of the end of the third branch pipe 211 closest to the second transition pipe 22, and the centerline of the fourth branch pipe 212 is the central axis of the end of the fourth branch pipe 212 closest to the second transition pipe 22.

[0058] After the exhaust manifold is assembled and the first included angle θ1 and the second included angle θ2 are adjusted, there is still a small deviation in the gas pressure drop generated by the first branch pipe 1 and the gas pressure drop generated by the second branch pipe 2. At this time, the curvature of the third branch pipe body 211 and the fourth branch pipe body 212 can be changed by changing the size of the fourth included angle θ4, thereby achieving fine adjustment of the gas pressure drop generated by the second branch pipe 2, so that the gas pressure drop generated by the second branch pipe 2 can be better balanced with the gas pressure drop generated by the first branch pipe 1, and achieve better exhaust uniformity of the exhaust manifold.

[0059] It should also be noted that, in addition to adjusting the size of the third included angle θ3 and the fourth included angle θ4 separately to achieve fine-tuning of the exhaust pressure loss of each exhaust manifold branch, it is also possible to simultaneously adjust the size of the third included angle θ3 and the fourth included angle θ4 to achieve fine-tuning of the exhaust pressure loss of each exhaust manifold branch.

[0060] For details on some implementations, please refer to [link / reference]. Figure 1 and Figure 2 , Figure 2 for Figure 1 Enlarged schematic diagram of part A. The aforementioned first branch pipe 1 includes a first inner pipe body 13 and a first heat insulation body 14 disposed outside the first inner pipe body 13. The first heat insulation body 14 completely covers the outside of the first inner pipe body 13, so that the heat outside the first inner pipe body 13 will not be transferred to the gas inside the first inner pipe body 13, thereby avoiding the risk of high temperature in the exhaust manifold.

[0061] For example, a gap is formed between the first insulation body 14 and the first inner tube body 13 to improve the overall insulation effect of the first branch pipe 1.

[0062] And / or, the second branch pipe 2 includes a second inner pipe body and a second heat insulation body disposed on the outside of the second inner pipe body. The second heat insulation body completely covers the outside of the second inner pipe body, so that the heat on the outside of the second branch pipe 2 will not be transferred to the gas inside the second inner pipe body, thereby avoiding the risk of high temperature in the exhaust manifold.

[0063] For example, a gap is formed between the second insulation body and the second inner tube body to improve the overall insulation effect of the second branch pipe 2.

[0064] In some implementations, please refer to the specific details. Figure 1 and Figure 3 As shown, the first branch pipe 1 is provided with a first assembly slot 15 for installing a first sensor, and the first assembly slot 15 is connected to the first branch pipe 1. The first sensor can be configured in the first assembly slot 15 to monitor the parameter values ​​(such as oxygen content, temperature value, etc.) and their changes in the gas in the first branch pipe 1. The second branch pipe 2 is provided with a second assembly slot 25 for installing a second sensor, and the second assembly slot 25 is connected to the second branch pipe 2. The second sensor can be configured in the second assembly slot 25 to monitor the parameter values ​​(such as oxygen content, temperature value, etc.) and their changes in the gas in the second branch pipe 2.

[0065] According to a second aspect of this disclosure, an exhaust system is provided that includes the exhaust manifold described above. This exhaust system possesses all the beneficial effects of the exhaust manifold described above, which will not be elaborated further herein.

[0066] In some embodiments, the exhaust system includes an engine and a turbocharger, with the main exhaust pipe 3 of the exhaust manifold detachably mounted to the turbocharger, and both the first branch pipe 1 and the second branch pipe 2 of the exhaust manifold detachably mounted to the engine. The engine here includes a first engine block and a second engine block, wherein the first branch pipe 1 of the exhaust manifold is detachably mounted to the first engine block, and the second branch pipe 2 of the exhaust manifold is detachably mounted to the second engine block.

[0067] This configuration ensures that when there is a difference in exhaust efficiency between the first and second engine blocks, the exhaust manifold prevents pressure differences from occurring within it. This effectively avoids the risk of chaotic exhaust pulses and guarantees the uniformity, stability, and smoothness of gas flow within the exhaust manifold. Simultaneously, the turbocharger also ensures a high level of horsepower and torque output from the engine.

[0068] According to a third aspect of this disclosure, a vehicle is provided that includes the exhaust system described above, and the vehicle has all the beneficial effects of the exhaust system described above, which will not be repeated here.

[0069] It should be noted that the vehicle may be a gasoline-powered vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., and this disclosure does not make any specific restrictions.

[0070] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0071] In the above embodiments, the descriptions of each embodiment have their own emphasis. Parts not described in detail in a particular embodiment can be referred to in the relevant descriptions of other embodiments. The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0072] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An exhaust manifold, characterized in that, include: Exhaust main pipe (3); as well as The first branch pipe (1) includes a first branch section (11) and a first transition pipe (12). The first branch section (11) is connected to the exhaust main pipe (3) through the first transition pipe (12). The direction perpendicular to the mounting reference plane of the first branch pipe (1) is defined as the projection direction A. The second branch pipe (2) includes a second branch section (21) and a second transition pipe (22). The second branch section (21) is connected to the exhaust main pipe (3) through the second transition pipe (22). The length of the second branch section (21) is longer than that of the first branch section (11). In the projection direction A, the center line of the first transition pipe (12) and the main center line of the exhaust pipe (3) form a first angle θ1, and the center line of the second transition pipe (22) and the main center line of the exhaust pipe (3) form a second angle θ2, wherein the first angle θ1 is smaller than the second angle θ2.

2. The exhaust manifold according to claim 1, characterized in that, The first included angle θ1 is an acute angle, and the second included angle θ2 is an obtuse angle.

3. The exhaust manifold according to claim 2, characterized in that, The first included angle θ1 has an angle range of 70° to 80°, and the second included angle θ2 has an angle range of 120° to 135°.

4. The exhaust manifold according to claim 1, characterized in that, The first branch pipe (1) further includes a first flange (16) disposed at the end of the first branch (11) away from the first transition pipe (12), and the second branch pipe (2) further includes a second flange (26) disposed at the end of the second branch (21) away from the second transition pipe (22), and the flange face of the first flange (16) is the mounting reference surface of the first branch pipe (1); In the projection direction A, the distance between the first flange (16) and the exhaust pipe (3) is less than the distance between the second flange (26) and the exhaust pipe (3).

5. The exhaust manifold according to any one of claims 1 to 4, characterized in that, The first branch (11) includes a first branch pipe (111) and a second branch pipe (112). The first branch pipe (111) and the second branch pipe (112) both converge at the first transition pipe (12), and the first branch pipe (111) and the second branch pipe (112) are both connected to the first transition pipe (12).

6. The exhaust manifold according to any one of claims 1 to 4, characterized in that, The second branch (21) includes a third branch pipe (211) and a fourth branch pipe (212), both of which converge at the second transition pipe (22) and are connected to the second transition pipe (22).

7. The exhaust manifold according to any one of claims 1 to 4, characterized in that, The first branch pipe (1) includes a first inner pipe body (13) and a first heat insulation body (14) disposed outside the first inner pipe body (13); And / or, the second branch pipe (2) includes a second inner pipe body and a second heat insulation body disposed outside the second inner pipe body.

8. The exhaust manifold according to any one of claims 1 to 4, characterized in that, The first branch pipe (1) is provided with a first assembly slot (15) for installing a first sensor, and the first assembly slot (15) is connected to the first branch pipe (1). The second branch pipe (2) is provided with a second assembly slot (25) for installing a second sensor, and the second assembly slot (25) is connected to the second branch pipe (2).

9. An exhaust system, characterized in that, Includes the exhaust manifold as described in claim 8.

10. The exhaust system according to claim 9, characterized in that, Includes an engine and a turbocharger, wherein the exhaust main pipe (3) of the exhaust manifold is detachably installed on the turbocharger, and both the first branch pipe (1) and the second branch pipe (2) of the exhaust manifold are detachably installed on the engine.

11. A vehicle, characterized in that, Includes the exhaust system as described in claim 9 or 10.

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