Exhaust pipe for an EGR model engine and engine
By optimizing the exhaust manifold structure, including the design of the intake section and guide channel, the problem of insufficient EGR rate of the engine under certain operating conditions was solved, achieving efficient exhaust gas recirculation, reducing NOx emissions, meeting emission regulations, and optimizing engine performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WEICHAI POWER CO LTD
- Filing Date
- 2025-09-12
- Publication Date
- 2026-07-21
AI Technical Summary
Existing engines struggle to achieve high EGR rates under certain operating conditions, making it difficult for nitrogen oxide (NOx) emissions to meet stricter emission limits.
By optimizing the exhaust manifold structure, a flow guide section is designed on the inner wall of the main exhaust pipe, and a flow guide channel is designed between the EGR intake and the turbocharger interface, including a first flow guide channel and a second flow guide channel, which work together to increase the flow rate of the EGR intake and reduce gas flow interference.
It significantly improves the exhaust gas diversion efficiency of the EGR system, increases the EGR rate, reduces NOx emissions, meets stricter emission regulations, and optimizes engine power and economy.
Smart Images
Figure CN224532810U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of engine technology, and in particular to an exhaust pipe and engine for an EGR engine. Background Technology
[0002] As consumers' expectations for vehicle performance rise, so too do their demands for engine performance. Simultaneously, to protect the environment and public health, restrictions on engine exhaust emissions are becoming increasingly stringent. Among these restrictions, nitrogen oxide (NOx) emissions have become a key indicator that must be controlled. Exhaust gas recirculation (EGR) technology is one of the effective strategies for reducing NOx emissions.
[0003] In existing technologies, some engines significantly reduce nitrogen oxide (NOx) emissions by employing external exhaust gas recirculation (EGR) systems. Nevertheless, even with the combination of conventional wastegate turbochargers and one-way valve designs, achieving high EGR rates under certain conditions remains difficult during road vehicle engine emissions testing due to limitations in turbocharger performance and operating conditions.
[0004] Therefore, how to improve the EGR rate is a technical problem that needs to be solved by those skilled in the art. Utility Model Content
[0005] The purpose of this application is to overcome the shortcomings of the prior art and provide an exhaust pipe and engine for EGR models.
[0006] To achieve the above objectives, in a first aspect, this application provides an exhaust pipe for an EGR engine, employing the following technical solution:
[0007] An exhaust pipe for an EGR engine includes an exhaust manifold. The exhaust manifold includes a main exhaust pipe and a plurality of cylinder exhaust pipes disposed along one side of the main exhaust pipe. The cylinder exhaust pipes are connected to the main exhaust pipe. The main exhaust pipe has an EGR intake port and a turbocharger interface. The connection position between the EGR intake port and the main exhaust pipe is located between two adjacent cylinder exhaust pipes. The main exhaust pipe has a guide portion that protrudes from the inner wall of the main exhaust pipe. The projection of the guide portion toward the EGR intake port covers at least a portion of the EGR intake port. At least one cylinder exhaust pipe is disposed between the EGR intake port and the turbocharger interface. The cylinder exhaust pipe between the EGR intake port and the turbocharger interface is an intermediate cylinder exhaust pipe. The intermediate cylinder exhaust pipe has a first guide channel and a second guide channel. The first guide channel is used to guide the exhaust flow to the turbocharger interface, and the second guide channel is used to guide the exhaust flow to the EGR intake port.
[0008] Furthermore, the drainage section is an arc-shaped surface facing the EGR air intake, and the center of the arc-shaped surface is on the same straight line as the center of the EGR air intake.
[0009] Furthermore, along the exhaust flow direction of the first guide channel, the cross-sectional area of the first guide channel is minimized at the airflow inlet end; and / or, along the exhaust flow direction of the second guide channel, the cross-sectional area of the second guide channel is minimized at the airflow inlet end.
[0010] Furthermore, the cross-sectional area of the airflow inlet end of the first guide channel is 1-2 times the cross-sectional area of the airflow inlet end of the second guide channel.
[0011] Furthermore, the inner diameter of the main exhaust pipe is D, the diameter of the EGR intake port is d, and the radius of the arc surface is R, where d≤R≤D.
[0012] Furthermore, the diameter of the main exhaust pipe is 2-5 times the minimum gap between the arc surface and the EGR intake port.
[0013] Furthermore, the line connecting the center of the arc surface and the center of the EGR intake port is perpendicular to the axis of the main exhaust pipe.
[0014] Furthermore, the main exhaust pipe is sequentially connected to the exhaust pipes of the first cylinder, the second cylinder, the third cylinder, and the fourth cylinder arranged in parallel. The EGR intake port is located between the first cylinder exhaust pipe and the second cylinder exhaust pipe, and the turbocharger interface is located between the second cylinder exhaust pipe and the third cylinder exhaust pipe.
[0015] Furthermore, the cylinder exhaust pipe, EGR intake port, and turbocharger interface are respectively provided with cylinder exhaust pipe flange, EGR intake port flange, and turbocharger interface flange, and mounting holes are provided on the cylinder exhaust pipe flange, the EGR intake port flange, and the turbocharger interface flange.
[0016] Secondly, this application provides an engine that adopts the following technical solution:
[0017] An engine including the exhaust pipe for the aforementioned EGR engine model.
[0018] The beneficial effects of this application are:
[0019] This application optimizes the structural design of the exhaust manifold, including adding a protruding guide section to the inner wall of the main exhaust pipe and setting a first and second guide channel in the intermediate cylinder exhaust pipe between the EGR intake and the turbocharger interface. The first guide channel directs exhaust gas to the turbocharger interface, and the second guide channel directs exhaust gas to the EGR intake, achieving airflow path control in the intermediate cylinder exhaust pipe. Furthermore, the guide section physically guides a portion of the exhaust gas from the cylinder exhaust pipe directly to the EGR intake, reducing interference from gas bypassing the EGR intake. Through the synergistic effect of the guide section and the guide channel, the flow rate at the EGR intake is significantly increased, improving the exhaust gas diversion efficiency of the EGR system and thus reducing NOx emissions. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art 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 the structures shown in these drawings without creative effort.
[0021] Figure 1 This is a three-dimensional structural diagram of the exhaust pipe for the EGR engine model in this application;
[0022] Figure 2 This is a three-dimensional structural diagram of the exhaust pipe for the EGR engine model of this application from another direction;
[0023] Figure 3 This is a partial structural cross-sectional view of the exhaust pipe for the EGR engine model in this application;
[0024] Figure 4 This is a top view of the exhaust pipe used in the EGR engine model of this application;
[0025] Figure 5 For the purposes of this application Figure 4 Sectional view at AA;
[0026] Figure 6 The simulated streamline diagram of the exhaust pipe for the EGR engine model of this application;
[0027] Figure 7 This is a simulated streamline diagram of a general exhaust pipe according to this application.
[0028] In the diagram, 100 is the main exhaust pipe; 200 is the cylinder exhaust pipe; 210 is the intermediate cylinder exhaust pipe; 211 is the first guide channel; 212 is the second guide channel; 221 is the first cylinder exhaust pipe; 222 is the second cylinder exhaust pipe; 223 is the third cylinder exhaust pipe; 224 is the fourth cylinder exhaust pipe; 300 is the EGR intake port; 400 is the turbocharger interface; 500 is the flow guide section; 600 is the cylinder exhaust pipe flange; 700 is the EGR intake port flange; 800 is the turbocharger interface flange; and 900 is the mounting hole. Detailed Implementation
[0029] The following is in conjunction with the appendix Figure 1 -Appendix Figure 7 The technical solutions in the embodiments of this application are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0030] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0031] Furthermore, the use of terms such as "first," "second," etc., in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0032] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0033] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this application.
[0034] like Figures 1-7 As shown in the figure, this application discloses an exhaust pipe for an EGR engine, including an exhaust manifold. The exhaust manifold includes a main exhaust pipe 100 and a plurality of cylinder exhaust pipes 200 arranged along one side of the main exhaust pipe 100. The cylinder exhaust pipes 200 communicate with the main exhaust pipe 100. The main exhaust pipe 100 is provided with an EGR intake port 300 and a turbocharger interface 400. The connection position of the EGR intake port 300 and the main exhaust pipe 100 is located between two adjacent cylinder exhaust pipes 200. The main exhaust pipe 100 is provided with a drain portion 500, which protrudes from the inner wall of the main exhaust pipe 100. The projection of part 500 toward the EGR intake port 300 covers at least a portion of the EGR intake port 300; at least one cylinder exhaust pipe 200 is provided between the EGR intake port 300 and the turbocharger interface 400, and the cylinder exhaust pipe 200 between the EGR intake port 300 and the turbocharger interface 400 is an intermediate cylinder exhaust pipe 210, which is provided with a first guide channel 211 and a second guide channel 212. The first guide channel 211 is used to guide the exhaust flow to the turbocharger interface 400, and the second guide channel 212 is used to guide the exhaust flow to the EGR intake port 300.
[0035] This application optimizes the structural design of the exhaust manifold, including adding a protruding guide section 500 to the inner wall of the main exhaust pipe 100, and setting a first guide channel 211 and a second guide channel 212 in the intermediate cylinder exhaust pipe 210 between the EGR intake port 300 and the turbocharger interface 400. Through the synergistic effect of the guide section 500 and the guide channel, the flow rate of the EGR intake port 300 is significantly increased, improving the exhaust gas diversion efficiency of the EGR (exhaust gas recirculation) system, reducing the technical difficulty of achieving a high EGR rate, and thus reducing NOx emissions.
[0036] Specifically, such as Figures 5-7As shown, during the engine exhaust process, the exhaust airflow flows from the exhaust pipes 200 of each cylinder to the main exhaust pipe 100, and finally to the turbocharger interface 400 and the EGR intake port 300. The intermediate cylinder exhaust pipe is connected to the main exhaust pipe 100 through the first guide channel 211 and the second guide channel 212. The first guide channel 211 and the second guide channel 212 form a "V" shaped structure. This "V" shaped structure is used to transition the connection between the outlet end of the intermediate cylinder exhaust pipe 210 and the main exhaust pipe 100, so that the exhaust in the intermediate cylinder exhaust pipe 210 flows to the turbocharger interface 400 through the first guide channel 211. The second guide channel 212 can also guide the exhaust in the intermediate cylinder exhaust pipe 210 to the EGR intake port 300, thereby realizing the control of the airflow path of the intermediate cylinder exhaust pipe 210. Furthermore, by adding a protruding guide portion 500 to the inner wall of the main exhaust pipe 100, the guide portion 500 protrudes towards the EGR intake port 300, and the projected area of the guide portion 500 towards the EGR intake port 300 at least partially covers the EGR intake port 300. The guide portion 500 can physically guide a portion of the exhaust gas from the cylinder exhaust pipe 200 directly to the EGR intake port 300, reducing interference from gas flow around the intake port. Further, Figure 6 Point A is a simulated streamline diagram of the "V"-shaped structure of the intermediate cylinder exhaust pipe 210 during the engine exhaust process; Figure 7 Point B is a simulated streamline diagram of a typical exhaust pipe during the engine exhaust process.
[0037] In one embodiment of this application, the drainage portion 500 is an arc surface facing the EGR intake port 300, and the center of the arc surface and the center of the EGR intake port 300 are on the same straight line.
[0038] like Figure 3 , Figure 4 As shown, the air intake 500 adopts an arc-shaped surface facing the EGR intake 300, with its center aligned with the center of the EGR intake 300, forming a precise airflow guidance path. By providing an arc-shaped surface on the inner wall of the main exhaust pipe 100, the exhaust gas flow from the cylinder exhaust pipes 200 on both sides of the arc-shaped surface can be guided towards the EGR intake 300, increasing the flow rate at the EGR intake 300, reducing airflow bypass or dispersion interference to the EGR system, lowering NOx emissions, and meeting stricter emission regulations. Furthermore, to balance engine performance and avoid sacrificing turbocharger efficiency for EGR system requirements, a larger turbocharger can be selected, optimizing the balance between power and fuel economy.
[0039] In one embodiment of this application, the cross-sectional area of the first guide channel 211 is the smallest at the airflow inlet end along the exhaust flow direction of the first guide channel 211; and / or, the cross-sectional area of the second guide channel 212 is the smallest at the airflow inlet end along the exhaust flow direction of the second guide channel 212.
[0040] By optimizing the cross-sectional area distribution of the guide channels, the exhaust gas diversion efficiency of the EGR intake 300 is further improved, solving the problem of low EGR rate caused by uneven airflow distribution in existing technologies. Specifically, the cross-sectional area of the second guide channel 212 is smallest at the inlet end and gradually expands towards the outlet end along the airflow direction, and / or the cross-sectional area of the first guide channel 211 is smallest at the inlet end and gradually expands towards the outlet end along the airflow direction. By gradually expanding the guide channels so that the cross-sectional area is smallest at the inlet end, based on the Venturi effect, the airflow is accelerated and concentrated through the change in cross-sectional area. This increases the airflow velocity at the inlet end of the guide channels, forming a local low-pressure zone, thereby enhancing the exhaust gas diversion capacity. This allows some exhaust gas to preferentially flow to the EGR intake 300, rather than all of it being concentrated in the direction of the booster, reducing the problem of insufficient EGR intake caused by the single manifold guidance in traditional designs.
[0041] In one embodiment of this application, the cross-sectional area of the airflow inlet end of the first guide channel 211 is 1-2 times the cross-sectional area of the airflow inlet end of the second guide channel 212.
[0042] By optimizing the cross-sectional area ratio of the first guide channel 211 and the second guide channel 212 at the gas inlet end, the exhaust gas diversion efficiency of the EGR intake port 300 is further improved. This design alters the airflow velocity and pressure distribution through the difference in cross-sectional area between the first guide channel 211 and the second guide channel 212. Specifically, for example... Figure 5 As shown, the cross-sectional area S1 of the airflow inlet end of the first guide channel 211 and the cross-sectional area S2 of the airflow inlet end of the second guide channel 212 are different. The first guide channel 211 has a larger inlet area and a lower airflow velocity, forming a high-pressure zone; the second guide channel 212 has a smaller inlet area and a higher airflow velocity, forming a low-pressure zone. This drives the exhaust gas to be preferentially diverted to the EGR intake port 300 after entering the main exhaust pipe 100.
[0043] In one embodiment of this application, the inner diameter of the main exhaust pipe 100 is D, the diameter of the EGR intake port 300 is d, the radius of the arc surface is R, and d≤R≤D.
[0044] By optimizing the geometric parameters of the arc surface radius R, the exhaust gas diversion efficiency of the EGR intake 300 is further improved, enhancing the EGR system's treatment of exhaust gas, reducing NOx emissions, and meeting stricter emission regulations. Specifically, to ensure sufficient contact area between the arc surface and the EGR intake 300, and to prevent vortices or separation of airflow at the EGR intake 300 due to an excessively small arc surface radius, thus reducing diversion efficiency, the arc surface radius is greater than or equal to the diameter of the EGR intake 300. Simultaneously, to limit the extension range of the arc surface and prevent an excessively large arc surface from causing an imbalance in airflow distribution on the inner wall of the exhaust manifold, affecting the turbocharger's intake efficiency, the arc surface radius is less than or equal to the inner diameter of the main exhaust pipe 100.
[0045] In one embodiment of this application, the diameter of the main exhaust pipe 100 is 2-5 times the minimum gap between the arc surface and the EGR intake port 300.
[0046] To improve the exhaust gas diversion efficiency of the EGR intake 300, the ratio between the diameter of the main exhaust pipe 100, the arc surface, and the gap between the EGR intake 300 is further optimized. Specifically, the coordinated design of the main exhaust pipe 100 diameter D and the minimum gap H between the arc surface and the EGR intake 300, i.e., D is 2-5 times H, ensures sufficient flow space for exhaust gas during diversion, avoiding airflow obstruction or blockage due to excessively small gaps, especially under high load conditions. It also limits excessive expansion of the pipe diameter, preventing airflow dispersion or energy loss, and maintaining the concentrated diversion effect of the EGR intake 300. Furthermore, the range of D / H ratio avoids stress concentration (such as welding or casting defects) caused by excessively large or small pipe diameters, extending the service life of the exhaust pipe.
[0047] In one embodiment of this application, the line connecting the center of the arc surface and the center of the EGR intake port 300 is perpendicular to the axis of the main exhaust pipe 100.
[0048] By designing the vertical relationship between the center of the arc surface and the center of the EGR intake 300, the airflow direction is altered, causing exhaust gas to preferentially flow towards the EGR intake 300, reducing interference from bypassing or dispersion on the EGR system. Specifically, the vertical relationship design ensures that exhaust gas, after entering the main exhaust pipe 100, is preferentially diverted to the EGR intake 300, reducing the problem of insufficient EGR intake caused by the single guidance of the manifold in traditional designs. The vertical relationship ensures that the arc surface is arranged at a specific angle in space, forming a physical barrier that forces the exhaust gas to flow along a predetermined path to the EGR intake 300, rather than directly impacting the central area of the main exhaust pipe 100.
[0049] In one embodiment of this application, the main exhaust pipe 100 is sequentially connected to a first cylinder exhaust pipe 221, a second cylinder exhaust pipe 222, a third cylinder exhaust pipe 223, and a fourth cylinder exhaust pipe 224 arranged in parallel. The EGR intake port 300 is located between the first cylinder exhaust pipe 221 and the second cylinder exhaust pipe 222, and the turbocharger interface 400 is located between the second cylinder exhaust pipe 222 and the third cylinder exhaust pipe 223.
[0050] like Figure 1 As shown, by optimizing the connection positions of the main exhaust pipe 100 and the exhaust pipes 200 of each cylinder, the exhaust gas diversion efficiency of the EGR intake port 300 is further improved, while ensuring that the turbocharger interface 400 can effectively obtain exhaust gas to maintain engine performance. Specifically, by placing the EGR intake port 300 between the first cylinder exhaust pipe 221 and the second cylinder exhaust pipe 222, and placing the turbocharger interface 400 between the second cylinder exhaust pipe 222 and the third cylinder exhaust pipe 223, the flow rate of the EGR intake port 300 is significantly increased, reducing NOx emissions.
[0051] In one embodiment of this application, the cylinder exhaust pipe 200, the EGR intake port 300, and the turbocharger interface 400 are respectively provided with a cylinder exhaust pipe flange 600, an EGR intake port flange 700, and a turbocharger interface flange 800, and each of the cylinder exhaust pipe flange 600, the EGR intake port flange 700, and the turbocharger interface flange 800 is provided with a mounting hole 900.
[0052] By installing specially designed flanges on the cylinder exhaust pipe 200, EGR intake port 300, and turbocharger interface 400, these flanges not only provide additional support but also facilitate subsequent installation and maintenance. This ensures a more secure connection between the cylinder exhaust pipe 200, EGR intake port 300, and turbocharger interface 400 and other components, preventing loosening due to vibration or thermal expansion and contraction. The mounting holes 900 on the flanges facilitate fixing with bolts and other fasteners, while the sealing gaskets effectively prevent gas leakage, ensuring efficient system operation and guaranteeing the reliability and durability of the connection.
[0053] Secondly, this application provides an engine that adopts the following technical solution:
[0054] An engine including the exhaust pipe for the aforementioned EGR engine model.
[0055] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.
Claims
1. An exhaust pipe for an EGR engine, characterized in that, include: An exhaust manifold, comprising a main exhaust pipe (100) and a plurality of cylinder exhaust pipes (200) arranged along one side of the main exhaust pipe (100), wherein the cylinder exhaust pipes (200) are connected to the main exhaust pipe (100), wherein the main exhaust pipe (100) is provided with an EGR intake port (300) and a turbocharger interface (400), wherein the connection position of the EGR intake port (300) and the main exhaust pipe (100) is located between two adjacent cylinder exhaust pipes (200); The main exhaust pipe (100) is provided with a flow guide (500), the flow guide (500) protrudes from the inner wall of the main exhaust pipe (100), and the projection of the flow guide (500) toward the EGR intake port (300) covers at least a portion of the EGR intake port (300). At least one cylinder exhaust pipe (200) is provided between the EGR intake port (300) and the turbocharger interface (400). The cylinder exhaust pipe (200) between the EGR intake port (300) and the turbocharger interface (400) is an intermediate cylinder exhaust pipe (210). The intermediate cylinder exhaust pipe (210) is provided with a first guide channel (211) and a second guide channel (212). The first guide channel (211) is used to guide the exhaust flow to the turbocharger interface (400), and the second guide channel (212) is used to guide the exhaust flow to the EGR intake port (300).
2. The exhaust pipe for EGR engines according to claim 1, characterized in that, The drainage section (500) is an arc surface facing the EGR intake port (300), and the center of the arc surface is on the same straight line as the center of the EGR intake port (300).
3. The exhaust pipe for EGR engines according to claim 1, characterized in that, Along the exhaust flow direction of the first guide channel (211), the cross-sectional area of the first guide channel (211) is the smallest at the airflow inlet end; And / or, along the exhaust flow direction of the second guide channel (212), the cross-sectional area of the second guide channel (212) is minimized at the airflow inlet end.
4. The exhaust pipe for EGR engines according to claim 1, characterized in that, The cross-sectional area of the airflow inlet end of the first guide channel (211) is 1-2 times the cross-sectional area of the airflow inlet end of the second guide channel (212).
5. The exhaust pipe for EGR engines according to claim 2, characterized in that, The inner diameter of the main exhaust pipe (100) is D, the diameter of the EGR intake port (300) is d, and the radius of the arc surface is R, where d≤R≤D.
6. The exhaust pipe for EGR engines according to claim 5, characterized in that, The diameter of the main exhaust pipe (100) is 2-5 times the minimum gap between the arc surface and the EGR intake port (300).
7. The exhaust pipe for EGR engines according to claim 2, characterized in that, The line connecting the center of the arc surface and the center of the EGR intake (300) is perpendicular to the axis of the main exhaust pipe (100).
8. The exhaust pipe for an EGR engine according to claim 1, characterized in that, The main exhaust pipe (100) is sequentially connected to the first cylinder exhaust pipe (221), the second cylinder exhaust pipe (222), the third cylinder exhaust pipe (223), and the fourth cylinder exhaust pipe (224) arranged in parallel. The EGR intake port (300) is located between the first cylinder exhaust pipe (221) and the second cylinder exhaust pipe (222) and the turbocharger interface (400) is located between the second cylinder exhaust pipe (222) and the third cylinder exhaust pipe (223).
9. The exhaust pipe for an EGR engine according to claim 1, characterized in that, The cylinder exhaust pipe (200), EGR intake port (300) and turbocharger interface (400) are respectively provided with cylinder exhaust pipe flange (600), EGR intake port flange (700) and turbocharger interface flange (800), and mounting holes (900) are provided on the cylinder exhaust pipe flange (600), the EGR intake port flange (700) and the turbocharger interface flange (800).
10. An engine, characterized in that, Includes an exhaust pipe for an EGR engine as described in any one of claims 1 to 9.