EGR (Exhaust Gas Recirculation) air inlet pipe

Abstract

The EGR air inlet pipe comprises an air inlet pipe body, a first connecting piece and a second connecting piece, wherein the first connecting piece and the second connecting piece are arranged at the two ends of the air inlet pipe body correspondingly. Wherein the air inlet pipe body comprises a first piece and a second piece which are divided in the length direction of the air inlet pipe body, the first piece and the second piece are each of an injection-molded plastic structure, and the first piece and the second piece are connected in a friction welding mode to form the air inlet pipe body. According to the EGR air inlet pipe, the air inlet pipe body is only composed of the first piece and the second piece, the structure is simpler, machining is more convenient, and the leakage problem caused by poor welding quality of the corrugated section can be avoided. Due to the fact that the first piece and the second piece are each of a plastic structure, the air inlet pipe body formed through combination is also of a plastic structure and has the characteristic of being adjustable in deformation, even if a corrugated section is omitted, the transmission path and direction of the air inlet pipe can be adjusted, the adjusting range and angle are wider, and the flexibility is higher; and the assembly requirements of different engines can be met.

Description

Technical Field

[0001] This application relates to the technical field of engines, and particularly to an EGR intake pipe. Background Art

[0002] EGR is the abbreviation of Exhaust Gas Re-circulation, which means the recirculation of exhaust gas. Exhaust gas recirculation refers to sending a part of the exhaust gas discharged from the engine back to the intake manifold and entering the cylinder again together with the fresh air-fuel mixture. Since the exhaust gas contains a large amount of polyatomic gases such as carbon dioxide, and gases such as carbon dioxide cannot burn but absorb a large amount of heat due to their high specific heat capacity, the maximum combustion temperature of the air-fuel mixture in the cylinder is reduced, thereby reducing the generation amount of NOx.

[0003] The existing EGR intake pipes usually include a pipe body and connectors provided at both ends of the pipe body. The connectors are used to connect the intake pipe to the engine. The pipe body includes two sections of round pipes and one section of corrugated pipe. The two ends of the corrugated pipe are respectively welded to one end of the two sections of round pipes, so that the round pipes and the corrugated pipe form an integral body. The EGR intake pipe usually adopts the bending forming + welding process, with a complex structure, high manufacturing difficulty and high processing requirements. Especially at the welded joints of the corrugated section and the flange position on the pipeline, leakage is likely to occur due to quality problems. At the same time, because the metal pipe has corrugations and poor toughness, it is difficult to bend and form, and the requirements for the pipeline orientation and length are harsh. If the orientation is complex or the length is too long, production cannot be carried out or the produced parts cannot meet the design requirements, resulting in problems such as difficult pipeline assembly or inability to assemble. Utility Model Content

[0004] Based on this, the present utility model provides an EGR intake pipe to solve the problems of high manufacturing difficulty and poor toughness of the existing EGR intake pipe, resulting in difficult assembly.

[0005] An EGR intake pipe provided by the present utility model includes an intake pipe body, and a first connector and a second connector respectively provided at both ends of the intake pipe body;

[0006] Wherein, the intake pipe body includes a first sheet and a second sheet divided along its length direction. Both the first sheet and the second sheet are plastic structures formed by injection molding, and the first sheet and the second sheet are welded together to form the intake pipe body.

[0007] In one embodiment, a positioning structure is provided between the first sheet and the second sheet; the positioning structure includes a matching welding groove and a welding rib. Wherein, the welding groove is provided on one of the first sheet and the second sheet, and the welding rib is provided on the other of the first sheet and the second sheet.

[0008] In one embodiment, on one side where the first sheet and the second sheet are connected to each other, there are connecting sheets extending outward.

[0009] The welding groove is provided on a first docking surface formed by the combination of the first sheet and the connecting sheet, and the welding rib is provided on a second docking surface formed by the combination of the second sheet and the connecting sheet.

[0010] In one embodiment, the materials of the first sheet and the second sheet are both nylon plus glass fiber.

[0011] In one embodiment, a number of first reinforcing ribs extending along the length direction thereof are provided on both the first sheet and the second sheet.

[0012] In one embodiment, the first connecting member is integrally provided on the first sheet or the second sheet; the second connecting member is integrally provided on the first sheet or the second sheet.

[0013] In one embodiment, both the first connecting member and the second connecting member are flanges. Among them, the first connecting member is an intake flange, and the second connecting member is an exhaust flange.

[0014] In one embodiment, an auxiliary limiting structure is further provided on the intake pipe body. The auxiliary limiting structure includes a fixing structure provided in the middle of the intake pipe body and a clamping structure provided on the side of the intake pipe body close to the first connecting member; the fixing structure is used for fixedly connecting with the engine, and the clamping structure is used for clamping with the engine.

[0015] In one embodiment, the fixing structure includes a connecting plate and a mounting plate. The connecting plate is connected to the intake pipe body, the mounting plate is provided on the connecting plate, and mounting holes are provided on the mounting plate.

[0016] In one embodiment, the clamping structure includes a clamping throat provided on the intake pipe body. There is a gap between the connecting sheet and the end of the first reinforcing rib and the intake flange, and the clamping throat is formed at the gap on the intake pipe body.

[0017] The utility model has at least the following beneficial effects compared with the prior art:

[0018] This EGR intake pipe, the intake pipe body is only composed of the first piece and the second piece. Compared with the existing corrugated intake pipe, the corrugated section is cancelled. Not only is the structure simpler and the processing more convenient, but also the leakage problem caused by poor welding quality of the corrugated section can be avoided. In addition, since both the first piece and the second piece are plastic structures, the combined intake pipe body is also a plastic structure, which itself has the characteristic of deformation and adjustment. Therefore, even if the corrugated section is cancelled, the transmission path and direction of the intake pipe can be adjusted according to the deformation and adjustment characteristics of the intake pipe body, achieving the effect of controlling the shape of the pipeline, and its adjustable position is no longer limited to a specific area (corrugated section) of the intake pipe, the adjustment range and angle are wider, and the flexibility is higher, which can meet the assembly requirements of different engines. Brief Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the EGR intake pipe in an embodiment;

[0020] Figure 2 It is a schematic structural diagram of the EGR intake pipe from another angle in an embodiment;

[0021] Figure 3 It is a schematic exploded view of the EGR intake pipe in an embodiment;

[0022] Figure 4 It is a schematic diagram of the second piece of the EGR intake pipe in an embodiment;

[0023] Figure 5 It is a schematic diagram of the first connecting piece of the EGR intake pipe in an embodiment.

[0024] The reference numerals in the drawings of the specification include: intake pipe body 1, first piece 101, second piece 102, welding groove 103, welding rib 104, first connecting piece 105, second connecting piece 106, first connecting member 2, annular groove 201, limiting notch 202, sealing ring 203, support leg 204, second connecting member 3, first reinforcing rib 4, fixing structure 5, connecting plate 501, mounting plate 502, mounting hole 503, second reinforcing rib 504, third reinforcing rib 505, clamping throat 6. Detailed Description of the Embodiment

[0025] In order to make the purpose, technical solutions and advantages of the present application clearer, the following further describes the present application in detail with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] It should be noted that the illustrations provided in this embodiment only schematically illustrate the basic concept of the present invention.

[0027] The structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0028] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0029] The existing EGR intake pipe, which is composed of a metal tube with a corrugated section, needs to adopt a bending forming + welding process. It has a complex structure, is difficult to manufacture, and has high processing requirements, especially the welding points of the corrugated section and the flange position on the pipeline, which are prone to leakage due to quality problems. At the same time, because the metal tube is corrugated and has poor toughness, it is difficult to bend and form, and has strict requirements on the direction and length of the pipeline. If the direction is complex or the length is too long, it cannot be produced or the produced parts cannot meet the design requirements, resulting in problems such as difficulty or inability to assemble the pipeline.

[0030] To address this, an embodiment of the utility model provides an EGR intake pipe, which includes an intake pipe body 1 and a first connecting member 2 and a second connecting member 3 respectively arranged at two ends of the intake pipe body 1;

[0031] The air intake pipe body 1 includes a first piece 101 and a second piece 102 divided along its length direction. The first piece 101 and the second piece 102 are both injection-molded plastic structures, and the first piece 101 and the second piece 102 are welded together to form the air intake pipe body 1.

[0032] The EGR intake pipe provided by the embodiment of the present utility model, the intake pipe body 1 is only composed of the first piece 101 and the second piece 102. Compared with the existing corrugated intake pipe, its corrugated section is cancelled, which not only makes the structure simpler and the processing more convenient, but also can avoid the leakage problem caused by poor welding quality of the corrugated section. In addition, since both the first piece 101 and the second piece 102 are plastic structures, the combined intake pipe body 1 is also a plastic structure, which itself has the characteristic of deformation and adjustability. Therefore, even if the corrugated section is cancelled, the transmission path and direction of the intake pipe can be adjusted according to the deformation and adjustability of the intake pipe body 1, achieving the effect of controlling the shape of the pipeline, and its adjustable position is no longer limited to a specific area (corrugated section) of the intake pipe, the adjustment range and angle are wider, and the flexibility is higher, which can meet the assembly requirements of different engines.

[0033] The following will describe in detail the EGR intake pipe provided by the embodiment of the present utility model with reference to the accompanying drawings.

[0034] According to Figure 1 Exemplarily showing the EGR intake pipe of at least one implementation manner of the present utility model, the EGR intake pipe includes: an intake pipe body 1 and a first connector 2 and a second connector 3 respectively arranged at both ends of the intake pipe body 1.

[0035] Among them, the intake pipe body 1 is a pipe fitting with a circular cross-section, and is used to send part of the exhaust gas discharged from the engine back to the intake manifold. Specifically, the intake pipe body 1 has an intake passage inside, and both ends are an intake port connected to the EGR system and an outlet port connected to the intake manifold. When the system is running, the exhaust gas is introduced into the intake passage from the intake port, then flows along the intake passage, and finally is discharged into the intake manifold from the outlet port.

[0036] In this embodiment, the intake pipe body 1 is a plastic structure, enabling it to have the ability of deformation and adjustability. According to the deformation and adjustability of the intake pipe body 1, the transmission path and direction of the intake pipe can be adjusted, achieving the effect of controlling the shape of the pipeline, and the adjustment range and angle are wide, and the flexibility is high, enabling it to be adjusted according to the layout of different engines, meeting the assembly requirements of different engines, and having better adaptability.

[0037] Specifically, refer to Figure 3, in this embodiment, the intake pipe body 1 includes a first piece 101 and a second piece 102 divided along its length direction. Both the first piece 101 and the second piece 102 are plastic structures formed by injection molding. For example, the materials of the first piece 101 and the second piece 102 are both nylon plus glass fiber. Specifically, the materials of the first piece 101 and the second piece 102 can be PA66+GF30 or GF35. With such a setting, the intake pipe body 1 formed by combining the plastic-structured first piece 101 and second piece 102 is also a plastic structure and has the ability to be deformed and adjusted, which can meet the assembly requirements of different engines.

[0038] More specifically, referring to Figure 3 , both the first piece 101 and the second piece 102 have channel grooves inside. The first piece 101 has a docking surface along the contour of its channel groove, and the second piece 102 also has a docking surface along the contour of its channel groove. The first piece 101 and the second piece 102 can be docked and combined into the intake pipe body 1 through the docking surfaces. When the first piece 101 and the second piece 102 are combined into the intake pipe body 1, the channel grooves inside the first piece 101 and the second piece 102 are combined to form an intake channel to realize the transportation of engine exhaust gas.

[0039] In this embodiment, the first piece 101 and the second piece 102 are connected by friction welding. After the first piece 101 and the second piece 102 are docked through the docking surfaces, vibration friction welding is then used. This connection method can ensure the connection strength between the first piece 101 and the second piece 102, ensure the reliability of the combined intake pipe body 1, and avoid air leakage points caused by bending of the intake pipe body 1.

[0040] Furthermore, in this embodiment, a positioning structure is provided between the first piece 101 and the second piece 102. Through the positioning structure, the welding operation of the first piece 101 and the second piece 102 can be made more accurate and reliable, ensuring the firmness and reliability of welding. For example, referring to Figure 3 , the positioning structure includes a welding groove 103 and a welding rib 104. The welding rib 104 can be embedded into the welding groove 103, and the welding groove 103 is provided on one of the first piece 101 and the second piece 102, and the welding rib 104 is provided on the other of the first piece 101 and the second piece 102. For example, in Figure 3 and Figure 4In the example, the welding groove 103 is provided on the butting surface of the first sheet 101, and the welding rib 104 is provided on the butting surface of the second sheet 102. With such an arrangement, when the first sheet 101 and the second sheet 102 are butted, the welding rib 104 on the first sheet 101 is embedded into the welding groove 103 on the second sheet 102, so as to achieve the precise positioning of the first sheet 101 and the second sheet 102. Moreover, the welding rib 104 and the welding groove 103 can also improve the quality of friction welding, making the welding firmness and reliability better.

[0041] Further, in this embodiment, on one side of the first sheet 101 and the second sheet 102 that are connected to each other, connection pieces extending outward are provided. Among them, referring to Figure 2 , the connection piece on the first sheet 101 is the first connection piece 105. The first connection piece 105 extends outward along the butting surface on the first sheet 101. The first connection piece 105 can be combined with the original butting surface on the first sheet 101 to form a butting surface with a larger area, denoted as the first butting surface; similarly, referring to Figure 3 , the connection piece on the second sheet 102 is the second connection piece 106. The second connection piece 106 extends outward along the butting surface on the second sheet 102. The second connection piece 106 can be combined with the original butting surface on the second sheet 102 to form a butting surface with a larger area, denoted as the second butting surface. In this way, through the first connection piece 105 and the second connection piece 106, the butting area between the first sheet 101 and the second sheet 102 can be increased, making the butting of the first sheet 101 and the second sheet 102 more stable and the welding effect better.

[0042] Further, in this embodiment, the welding groove 103 is provided on the first butting surface formed by the combination of the first sheet 101 and the connection piece, and the welding rib 104 is provided on the second butting surface formed by the combination of the second sheet 102 and the connection piece. Based on the first butting surface and the second butting surface with a larger butting area, the designed widths of the welding groove 103 and the welding rib 104 can be larger, the cooperation is more stable, and the welding firmness and reliability are further improved.

[0043] Referring to Figure 1 , in some embodiments, first reinforcing ribs 4 extending along their length directions are provided on both the first sheet 101 and the second sheet 102. On the one hand, the reinforcing ribs increase the overall strength and NVH characteristics of the intake pipe, and on the other hand, they increase the aesthetics of the parts.

[0044] In this embodiment, the first connecting member 2 and the second connecting member 3 at both ends of the intake pipe body 1 are both used to connect the components of the engine system to ensure the connection stability between the intake pipe body 1 and the EGR system as well as the intake manifold. For example, referring to Figure 1, the first connecting member 2 is disposed on one side of the air inlet of the air inlet pipe body 1 for connecting to the EGR system; the second connecting member 3 is disposed on one side of the air outlet of the air inlet pipe body 1 for connecting to the intake manifold.

[0045] In this embodiment, the first connecting member 2 is integrally disposed on the first piece 101 or the second piece 102; the second connecting member 3 is integrally disposed on the first piece 101 or the second piece 102. For example, Figure 3 An exemplary embodiment shows that both the first connecting member 2 and the second connecting member 3 are disposed on the first piece 101. Among them, the integral setting can be integral injection molding. In this way, by connecting the air inlet pipe body 1 with the first connecting member 2 and the second connecting member 3 in an integral molding manner, the leakage problem caused by poor welding quality between the connecting member and the air inlet pipe body 1 can be avoided.

[0046] Specifically, refer to Figure 1 , both the first connecting member 2 and the second connecting member 3 are flanges. Among them, the first connecting member 2 is an intake flange, and the second connecting member 3 is an exhaust flange. Flange holes are provided on both the intake flange and the exhaust flange. During installation, the engine components are connected by bolts passing through the flange holes, which has a simple structure and stable connection.

[0047] Furthermore, refer to Figure 5 , a ring groove 201 is provided on the intake flange, and a sealing ring 203 is disposed in the ring groove 201; a limiting notch 202 communicating with the ring groove 201 is also provided on the intake flange, and a limiting leg 204 limited in the limiting notch 202 is connected to the sealing ring 203. In this way, the sealing ring 203 can ensure the docking sealing performance between the intake flange and the EGR system, avoiding air leakage at the connection, and the limiting notch 202 can play a role in limiting the installation of the sealing ring 203, ensuring the reliable and firm installation of the sealing ring 203.

[0048] In this embodiment, an auxiliary limiting structure is further provided on the air inlet pipe body 1. The air inlet pipe body 1 is connected to the engine manifold through the auxiliary limiting structure, which can ensure the connection stability between the air inlet pipe and the engine, avoid large swings of the air inlet pipe during vehicle operation, and improve its stability.

[0049] Refer to Figure 1 , the auxiliary limiting structure specifically includes a fixing structure 5 and a clamping structure. Among them, the fixing structure 5 is disposed in the middle of the air inlet pipe body 1 to facilitate fixing and limiting it from the middle of the air inlet pipe body 1, improving the overall installation stability of the air inlet pipe, while the clamping structure is disposed on the side of the air inlet pipe body 1 close to the air inlet to facilitate clamping and limiting the part where the air inlet pipe is connected to the EGR system, improving the installation stability of this connection part.

[0050] Specifically, refer to Figure 1 andFigure 3 , the fixing structure 5 is integrally formed on the first piece 101, but not limited to this. For example, in other embodiments, the fixing structure 5 can also be arranged on the second piece 102. Specifically, the fixing structure 5 includes a connecting plate 501 and a mounting plate 502. Among them, the connecting plate 501 is connected to the intake pipe body 1, the mounting plate 502 is arranged on the connecting plate 501, and mounting holes 503 are arranged on the mounting plate 502. Based on this structure, by matching the mounting holes 503 on the mounting plate 502 with the corresponding mounting holes on the intake manifold and then using bolts for fastening, the fixation of the intake pipe to the engine manifold can be achieved.

[0051] Further, referring to Figure 1 , on the side of the connecting plate 501 facing away from the engine manifold, a second reinforcing rib 504 is provided. The second reinforcing rib 504 improves the self-strength of the connecting plate 501 and can ensure the connection stability between the intake pipe and the intake manifold. And the side of the connecting plate 501 facing the intake pipe is a smooth plane, reducing the irregular structure on this side of the connecting plate 501 to facilitate the installation and cooperation between the mounting plate 502 and the intake manifold.

[0052] Referring to Figure 2 , between one end of the connecting plate 501 connected to the intake pipe body 1 and the intake pipe body 1, a third reinforcing rib 505 is provided. The third reinforcing rib 505 can enhance the bonding strength between the connecting plate 501 and the intake pipe body 1 and ensure the firmness and reliability of the fixing structure 5.

[0053] Referring to Figure 1 , a metal bushing is embedded in the mounting hole 503. The metal bushing can increase the strength at the mounting hole 503 and ensure the connection strength between the mounting plate 502 and the intake manifold.

[0054] Further, referring to Figure 1 , the thickness of the metal bushing is greater than the thickness of the mounting plate 502. Correspondingly, a thickened boss is provided at the mounting hole 503. This boss can deepen the depth of the mounting hole 503 to be the same as the thickness of the metal bushing, so as to facilitate the complete wrapping of the metal bushing by the mounting hole 503. On the one hand, it ensures the firmness and reliability after the bushing is inlaid. On the other hand, it ensures that the installation bolt can have sufficient screwing depth and sufficient installation contact surface, ensuring that the bolt is reliable and not easy to loosen after installation.

[0055] In this embodiment, the clamping structure is a clamping throat 6 arranged on the intake pipe body 1. Specifically, referring to Figure 1, there are gaps between the connecting pieces on the first piece 101 and the second piece 102 and the first reinforcing rib 4 and the first connecting piece 2. This gap causes the parts of the connecting piece and the first reinforcing rib 4 protruding from the intake pipe body 1 and the first connecting piece 2 to define a circular throat, which is the clamping throat 6. The intake pipe can be clamped at the clamping point of the intake manifold through the clamping throat 6, realizing the clamping fit between the intake end of the EGR intake pipe and the intake manifold.

[0056] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0057] The above embodiments only express several implementation manners of the present application. The description is relatively specific and detailed, but it cannot be understood as a limitation to the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. An EGR intake pipe, characterized in that: It comprises an air intake pipe body (1) and a first connecting piece (2) and a second connecting piece (3) respectively arranged at two ends of the air intake pipe body (1); The air intake pipe body (1) comprises a first piece (101) and a second piece (102) divided along its length direction, the first piece (101) and the second piece (102) are both injection-molded plastic structures, and the first piece (101) and the second piece (102) are welded together to form the air intake pipe body (1).

2. The EGR intake pipe according to claim 1, characterized in that: A positioning structure is provided between the first sheet (101) and the second sheet (102); The positioning structure comprises a matching welding groove (103) and a welding rib (104), wherein the welding groove (103) is arranged on one of the first sheet (101) and the second sheet (102), and the welding rib (104) is arranged on the other of the first sheet (101) and the second sheet (102).

3. The EGR intake pipe according to claim 2, characterized in that: A connecting piece extending outward is provided on one side where the first piece (101) and the second piece (102) are connected to each other; The welding groove (103) is arranged on a first butt joint surface formed by the combination of the first sheet (101) and the connecting sheet, and the welding rib (104) is arranged on a second butt joint surface formed by the combination of the second sheet (102) and the connecting sheet.

4. The EGR intake pipe according to claim 1, 2 or 3, characterized in that: The materials of the first sheet (101) and the second sheet (102) are both nylon and glass fiber.

5. The EGR intake pipe according to claim 3, characterized in that: The first sheet (101) and the second sheet (102) are both provided with a plurality of first reinforcing ribs (4) extending along their length directions.

6. The EGR intake pipe according to claim 5, characterized in that: The first connecting member (2) is integrally arranged on the first sheet (101) or the second sheet (102); The second connecting member (3) is integrally arranged on the first sheet (101) or the second sheet (102).

7. The EGR intake pipe according to claim 6, characterized in that: The first connecting piece (2) and the second connecting piece (3) are both flanges, wherein the first connecting piece (2) is an air inlet flange and the second connecting piece (3) is an air outlet flange.

8. The EGR intake pipe according to claim 7, characterized in that: The air intake pipe body (1) is also provided with an auxiliary limiting structure, the auxiliary limiting structure comprising a fixing structure (5) arranged in the middle of the air intake pipe body (1) and a clamping structure arranged on the side of the air intake pipe body (1) close to the first connecting member (2); the fixing structure (5) is used for fixed connection with the engine, and the clamping structure is used for clamping with the engine.

9. The EGR intake pipe according to claim 8, characterized in that: The fixing structure (5) comprises a connecting plate (501) and a mounting plate (502); the connecting plate (501) is connected to the air intake pipe body (1); the mounting plate (502) is arranged on the connecting plate (501); and a mounting hole (503) is arranged on the mounting plate (502).

10. The EGR intake pipe according to claim 8, characterized in that: The clamping structure comprises a clamping throat portion (6) arranged on the air intake pipe body (1), a gap is provided between the connecting piece and the end of the first reinforcing rib (4) and the air intake flange, and the clamping throat portion (6) is formed on the air intake pipe body (1) at the gap.

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