Intake manifold assembly

Abstract

The utility model relates to an intake manifold assembly which comprises a manifold body, a first connecting fitting part and a second connecting fitting part, the manifold body comprises a pressure stabilizing cavity and a plurality of branch pipes communicating with the pressure stabilizing cavity, the manifold body is provided with an EGR air inlet communicating with the pressure stabilizing cavity, and the EGR air inlet is provided with the first connecting fitting part; the EGR connecting pipe is of a plastic structure, a first connecting piece and a second connecting piece are arranged at the two ends of the EGR connecting pipe correspondingly, and a clamping throat part is arranged on the side, close to the second connecting piece, of the EGR connecting pipe; the first end of the EGR connecting pipe is detachably connected with the first connecting matching piece through a first connecting piece, and an outlet of the EGR connecting pipe communicates with the EGR air inlet. A fixing clamping groove is formed in the side, away from the EGR air inlet, of the manifold body, and the second end of the EGR connecting pipe is detachably connected to the fixing clamping groove in a clamped mode through the clamping throat part. According to the scheme, the manifold body and the EGR connecting pipe are more convenient and faster to assemble and disassemble, the EGR connecting pipe can adjust the transmission path and direction of the EGR connecting pipe, the adjusting range and angle are wider, the flexibility is higher, and the assembling requirements of different engines can be met.

Description

Technical Field

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

[0002] The intake manifold of an engine is used to distribute air, fuel mixture, or clean air as evenly as possible to each cylinder of the engine to ensure the smooth operation and performance optimization of the engine. In the prior art, to reduce the emissions of nitrogen oxides (NOx), an EGR system is usually added to send part of the exhaust gas discharged from the engine back to the intake manifold and enter the cylinder again together with the fresh mixture. Through the absorption of a large amount of heat by polyatomic gases such as carbon dioxide in the exhaust gas, the maximum combustion temperature of the mixture in the cylinder is reduced, thereby reducing the generation amount of NOx.

[0003] In the existing connection between the EGR system and the intake manifold, the outlet pipe of the EGR system is usually directly connected to the EGR intake flange on the intake manifold. However, due to the layout position limitations of some engines, the outlet pipe of the EGR system cannot be directly connected to the EGR intake port of the intake manifold. Therefore, an EGR intake passage needs to be separately provided. The existing EGR intake passage is basically a corrugated metal pipe, and it is difficult to adjust its transmission path and direction. Therefore, the EGR intake passage is usually completely fixed on the intake manifold, resulting in cumbersome operations when performing disassembly, installation, replacement, position adjustment, etc. on the EGR intake passage. Utility Model Content

[0004] Based on this, the present utility model provides an intake manifold assembly, aiming to solve the problems of complex manufacturing of the EGR connection pipeline in the intake manifold assembly and large limitations in layout and adjustment.

[0005] An intake manifold assembly provided by the present utility model includes:

[0006] A manifold body, which includes a pressure stabilizing chamber and a plurality of branch pipes communicated with the pressure stabilizing chamber. An EGR intake port communicated with the pressure stabilizing chamber is provided on the manifold body, and a first connection fitting is provided on the EGR intake port;

[0007] An EGR connecting pipe, the EGR connecting pipe is of a plastic structure, and a first connecting member and a second connecting member are respectively provided at both ends thereof. A clamping throat is provided on one side of the EGR connecting pipe close to the second connecting member; wherein,

[0008] The first end of the EGR connecting pipe is detachably connected to the first connection fitting through the first connecting member, and the outlet of the EGR connecting pipe is communicated with the EGR intake port;

[0009] On one side of the manifold body away from the EGR intake port, a fixed card slot is provided, and the second end of the EGR connecting pipe is detachably clamped in the fixed card slot through the clamping throat.

[0010] In one embodiment, the first connection fitting is a first connection flange, the first connecting member is a second connection flange matching the first connection flange, and the second connecting member is a third connection flange.

[0011] In one embodiment, a ring groove and a limit notch communicating with the ring groove are provided on the first connection flange. A sealing ring is embedded in the ring groove, and a support leg embedded in the limit notch is fixed on the sealing ring.

[0012] In one embodiment, a second reinforcing rib extending along the length direction is provided on the EGR connecting pipe. There is a gap between the end of the second reinforcing rib and the second connecting member, and the clamping throat is formed at the gap on the EGR connecting pipe.

[0013] In one embodiment, a fixed boss is further provided on the part of the manifold body between the EGR intake port and the fixed card slot, and a fixed structure detachably and fixedly connected to the fixed boss is provided on the EGR connecting pipe.

[0014] In one embodiment, a first mounting hole is provided on the fixed boss;

[0015] The fixed structure includes a connecting plate and a mounting plate. The connecting plate is connected to the EGR connecting pipe, the mounting plate is arranged on the connecting plate, and a second mounting hole opposite to the first mounting hole is provided on the mounting plate;

[0016] The first mounting hole and the second mounting hole are used for screwing a bolt to fasten the fixed structure and the fixed boss.

[0017] In one embodiment, the EGR connecting pipe includes a first piece and a second piece divided along its length direction. Both the first piece and the second piece are plastic structures formed by injection molding, and the first piece and the second piece are butt-welded to form the EGR connecting pipe.

[0018] In one embodiment, the materials of both the first piece and the second piece are nylon plus glass fiber.

[0019] In one embodiment, connecting pieces extending outward are provided on one side where the first piece and the second piece are connected to each other.

[0020] In one embodiment, the first connecting member and the second connecting member are integrally formed on the EGR connecting pipe.

[0021] The utility model has at least the following beneficial effects compared with the prior art:

[0022] For this intake manifold assembly, one end of the EGR connecting pipe is fixed to the manifold by a detachable fitting of a connecting piece, and the other end is fixed to the manifold by a detachable snap connection of a card slot and a snap-in throat, making the installation and disassembly of the EGR connecting pipe more convenient and fast, facilitating the replacement of the EGR connecting pipe. Moreover, it is also convenient to quickly remove the EGR connecting pipe when matching low-end vehicle models without an EGR system, so that the same intake manifold can be matched with different vehicle models. Furthermore, the EGR connecting pipe is of a plastic structure and inherently has the characteristic of deformability and adjustability. Therefore, even if the corrugated section is cancelled, the transmission path and direction of the connecting pipe can be adjusted according to the deformability and adjustability of the EGR connecting pipe, achieving the effect of controlling the shape of the pipeline. And the range and angle of its adjustment are wider and the flexibility is higher, which can meet the assembly requirements of different engines. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the intake manifold assembly in one embodiment;

[0024] Figure 2 It is a schematic structural diagram of the disassembled intake manifold assembly in one embodiment;

[0025] Figure 3 It is a schematic structural diagram of the EGR intake port of the intake manifold assembly in one embodiment;

[0026] Figure 4 It is a schematic structural diagram of the EGR connecting pipe of the intake manifold assembly in one embodiment;

[0027] Figure 5 It is a schematic structural diagram of the disassembled EGR connecting pipe of the intake manifold assembly in one embodiment.

[0028] The reference numerals in the drawings of the specification include: manifold body 1, pressure stabilizing cavity 101, branch pipe 102, total intake port 103, EGR intake port 104, air outlet 105, first reinforcing rib 106, first fixing bracket 107, second fixing bracket 108, EGR connecting pipe 2, snap-in throat 201, first piece 202, second piece 203, connecting piece 204, second reinforcing rib 205, connecting fitting 3, ring groove 301, limiting notch 302, sealing ring 303, support leg 304, first connecting piece 4, second connecting piece 5, fixing card slot 6, fixing boss 7, first mounting hole 701, fixing structure 8, second mounting hole 801, connecting plate 802, mounting plate 803. Detailed Embodiments

[0029] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below in conjunction with the accompanying 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.

[0030] It should be noted that the illustrations provided in this embodiment only schematically illustrate the basic concept of the present utility model.

[0031] The structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limiting conditions under which the present utility model can be implemented. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the objectives that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present utility model.

[0032] The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "middle", "longitudinal", "transverse", "horizontal", "inner", "outer", "radial", "circumferential", etc. cited in this specification is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of simplified description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] The EGR pipeline of the existing intake manifold assembly usually adopts a corrugated metal pipe, and the layout and fixation are greatly restricted. It is usually directly fixed on the intake manifold, resulting in more cumbersome operations when performing disassembly, installation, replacement, position adjustment, etc. on the EGR connection pipeline.

[0034] In view of this, the embodiment of the present utility model provides an intake manifold assembly, which includes:

[0035] A manifold body 1, which includes a pressure stabilizing cavity 101 and a plurality of branch pipes 102 communicated with the pressure stabilizing cavity 101. An EGR air inlet 104 communicated with the pressure stabilizing cavity 101 is provided on the manifold body 1, and a first connection fitting 3 is provided on the EGR air inlet 104;

[0036] An EGR connecting pipe 2, the EGR connecting pipe 2 is of a plastic structure and first connectors 4 and second connectors 5 are respectively provided at both ends thereof. A clamping throat 201 is provided on one side of the EGR connecting pipe 2 close to the second connector 5; wherein,

[0037] The first end of the EGR connecting pipe 2 is detachably connected to the first connecting fitting 3 via the first connecting piece 4, and the outlet of the EGR connecting pipe 2 is connected to the EGR air inlet 104;

[0038] A fixed slot 6 is provided on one side of the manifold body 1 away from the EGR air inlet 104 , and the second end of the EGR connecting pipe 2 is detachably clamped in the fixed slot 6 via the clamping throat portion 201 .

[0039] The intake manifold assembly provided by the embodiment of the utility model is fixed by fixing one end of the EGR connecting pipe 2 by a detachable matching method of a connector, and fixing the other end by a detachable clamping method of a fixed clamping groove 6 and a clamping throat 201, so that the installation and removal of the EGR connecting pipe 2 are more convenient and quick, which is conducive to the replacement of the EGR connecting pipe 2, and is also convenient for quickly removing the EGR connecting pipe 2 when matching a low-end vehicle model without an EGR system, so that the same intake manifold can match different vehicle models. Moreover, the EGR connecting pipe 2 is a plastic structure, which itself has the characteristic of adjustable deformation. Therefore, even if the corrugated section is cancelled, the transmission path and direction of the connecting pipe can be adjusted according to the adjustable deformation characteristic of the EGR connecting pipe 2, so as to achieve the effect of controlling the shape of the pipeline, and its adjustment range and angle are wider, and the flexibility is higher, which can meet the assembly requirements of different engines.

[0040] The intake manifold assembly provided by the embodiment of the utility model is described in detail below with reference to the accompanying drawings.

[0041] according to Figure 1 An intake manifold assembly according to at least one embodiment of the utility model is shown by way of example. The intake manifold assembly includes a manifold body 1 and an EGR connecting pipe 2 .

[0042] See also Figure 1 The manifold body 1 is formed by welding the manifold upper piece and the manifold lower piece. Specifically, the manifold upper piece and the manifold lower piece are welded together by a vibration friction welding process. The manifold body 1 has a pressure stabilizing chamber 101 and a plurality of branch pipes 102 connected to the pressure stabilizing chamber 101. The number of branch pipes 102 matches the number of cylinders of the engine. Each cylinder is provided with a branch pipe 102. For example, Figure 1 The embodiment in which the manifold body 1 has four branch pipes 102 is exemplarily shown. A total air inlet 103 is provided at one end of the pressure stabilizing chamber 101 on the manifold body 1, and the mixture of air and fuel or fresh air enters the pressure stabilizing chamber 101 through the total air inlet 103. An air outlet 105 is provided on each branch pipe 102, and the air-fuel mixture or fresh air is evenly distributed to each branch pipe 102 in the pressure stabilizing chamber 101, and then discharged to each cylinder through the air outlet 105 of each branch pipe 102, thereby ensuring the uniformity of air intake in each cylinder of the engine.

[0043] See Figure 2 In some embodiments, a number of first reinforcing ribs 106 are arranged in a criss-cross pattern on the surface of the manifold body 1. The first reinforcing ribs 106 can improve the overall modal and structural strength of the manifold body 1 and enhance the NVH characteristics.

[0044] Furthermore, see Figure 2 A first fixing bracket 107 and a second fixing bracket 108 are further arranged at the bottom of the manifold body 1. The first fixing bracket 107 and the second fixing bracket 108 are integrally arranged at both ends of the bottom of the manifold body 1. Through the fixing brackets, the connection and fixation of the manifold body 1 to the engine can be quickly realized, and there is no need to separately assemble a metal bracket for fixation, saving the development of the bracket and reducing the cost.

[0045] Furthermore, see Figure 1 A plurality of fixing points are further arranged on the upper part of the manifold body 1. The fixing points are through holes for fixing bolts to pass through. Through the plurality of fixing points, the upper part of the manifold body 1 can be fixedly connected to the cylinder head, and the connection stability is good.

[0046] It should be understood that other necessary components are also arranged on the manifold body 1. For example, mounting brackets for carbon canister solenoids, mounting brackets for various sensors, clips for fixing wire harnesses and pipelines, etc. They are all prior arts and will not be elaborated in this embodiment.

[0047] See Figure 2 In this embodiment, an EGR intake port 104 is arranged at the inner side of the manifold body 1 corresponding to its total intake port 103, and the EGR intake port 104 is communicated with the total intake port 103. The EGR intake port 104 is used to introduce the engine exhaust gas transmitted by the EGR system into the total intake port 103, so that the engine exhaust gas is mixed with the air-fuel mixture or fresh air and then enters the pressure stabilizing chamber 101 to achieve the purposes of reducing emissions, improving fuel efficiency, reducing carbon deposition and improving ignition performance.

[0048] Furthermore, an EGR distributor is arranged inside the total intake port 103. The EGR intake port 104 is opposite to and communicated with the EGR distributor. The EGR distributor can specifically adopt an existing EGR distributor, and the structure thereof will not be elaborated in this embodiment. With such an arrangement, through the EGR distributor, the fresh intake air and the engine exhaust gas can be fully and evenly mixed, improving the stability of the intake air, optimizing the combustion, and improving the engine economy and emissions.

[0049] See Figure 1, in this embodiment, the EGR connecting pipe 2 is arranged inside the manifold body 1. Its first end is connected to the EGR air inlet 104, and the second end is limited on the manifold body 1. During installation, connect the second end of the EGR connecting pipe 2 to the outlet pipe of the EGR system, and the connection between the EGR system and the intake manifold can be achieved.

[0050] Specifically, referring to Figure 2 , a first connection fitting 3 is provided on the EGR air inlet 104, and a first connecting piece 4 matching the first connection fitting 3 is provided at the first end of the EGR connecting pipe 2, so that the first end of the EGR connecting pipe 2 can be fixed to the manifold body 1 through the first connection fitting 3 and the first connecting piece 4, and the EGR connecting pipe 2 is communicated with the EGR air inlet 104. For example, both the first connection fitting 3 and the first connecting piece 4 can be flanges. Among them, the first connection fitting 3 is the first connection flange, the first connecting piece 4 is the second connection flange, and the first connection flange and the second connection flange are provided with matching flange holes. During installation, connect them by passing bolts through the flange holes. Its structure is simple, the connection is stable, and it is convenient for installation and disassembly.

[0051] Furthermore, in this embodiment, a sealing structure is also provided on the first connection fitting 3 to ensure the connection tightness between the EGR connecting pipe 2 and the manifold body 1 and avoid air leakage at the connection. For example, referring to Figure 3 , a ring groove 301 and a limiting notch 302 communicating with the ring groove 301 are provided on the first connection flange. A sealing ring 303 is embedded in the ring groove 301, and a support leg 304 embedded in the limiting notch 302 is fixed on the sealing ring 303. The limiting notch 302 can play a role in limiting the installation of the sealing ring 303 and ensure the reliable and firm installation of the sealing ring 303.

[0052] Referring to Figure 2 , correspondingly, a second connecting piece 5 for matching with the outlet pipe of the EGR system is also provided at the second end of the EGR connecting pipe 2. The second connecting piece 5 can also be a flange, denoted as the third connection flange, which can achieve a quick connection with the outlet pipe of the EGR system.

[0053] Furthermore, in this embodiment, both the first connecting piece 4 and the second connecting piece 5 are provided on the EGR connecting pipe 2 in an integrally formed manner. For example, integrally injection molded. In this way, the EGR connecting pipe 2 is connected to the first connecting piece 4 and the second connecting piece 5 by an integrally formed method, which can avoid leakage problems caused by poor welding quality between the connecting piece and the EGR connecting pipe 2, and has better airtightness.

[0054] In this embodiment, the second end of the EGR connecting pipe 2 is fixed to the manifold body 1 by a clamping method to facilitate the quick disassembly and assembly of the EGR connecting pipe 2 and the manifold body 1.

[0055] Specifically, referring to Figure 2 , a fixing slot 6 is provided on one side of the manifold body 1 away from the EGR intake port 104. A clamping throat 201 is provided on one side of the EGR connecting pipe 2 close to the second connecting member 5. The second end of the EGR connecting pipe 2 is detachably clamped in the fixing slot 6 through the clamping throat 201. With such a setting, during pipeline installation, it can be directly clamped in the slot without separate bolts and brackets, making the installation and disassembly of the EGR connecting pipe 2 more convenient and rapid, facilitating the replacement of the EGR connecting pipe 2, and also facilitating the rapid removal of the EGR connecting pipe 2 when matching low - equipped vehicle models without an EGR system, so that the same intake manifold can match different vehicle models.

[0056] More specifically, in this embodiment, the clamping throat 201 on the EGR connecting pipe 2 can be formed in the following manner. Referring to Figure 4 , a plurality of second reinforcing ribs 205 extending along the length direction are circumferentially distributed on the EGR connecting pipe 2, and there is a gap between one end of the second reinforcing rib 205 close to the second connecting member 5 and the second connecting member 5. This gap makes a throat that is concave inward compared to the outside of the first reinforcing rib 106 and the second connecting member 5 between each first reinforcing rib 106 and the second connecting member 5. This throat is the clamping throat 201, and at the same time, this throat is also a part of the EGR connecting pipe 2 and is a circular pipe section. With such a setting, the clamping throat 201 is defined between the first reinforcing rib 106 and the second connecting member 5 on the EGR connecting pipe 2. When the clamping throat 201 is clamped in the fixing slot 6 on the manifold body 1, the first reinforcing rib 106 and the second connecting member 5 can limit both ends of the fixing slot 6 to ensure the clamping stability of the EGR connecting pipe 2 and the fixing slot 6. In addition, the second reinforcing rib 205 can also increase the overall strength and NVH characteristics of the EGR connecting pipe 2 and improve the aesthetics of the part.

[0057] Referring to Figure 2 , the fixing slot 6 is formed on a bracket on one side of the manifold body 1 away from the EGR intake port 104. The fixing slot 6 is a circular slot with an opening, and the diameter of the fixing slot 6 matches the diameter of the clamping throat 201, so that the clamping throat 201 can just be clamped firmly in the fixing slot 6, and both disassembly and installation are quick and convenient.

[0058] Furthermore, in this embodiment, an auxiliary limiting structure is also provided between the middle of the EGR connecting pipe 2 and the manifold body 1. Through the auxiliary limiting structure, the EGR connecting pipe 2 can be fixed and limited from its middle part, improving the overall installation stability of the connecting pipe and preventing the EGR connecting pipe 2 from generating large vibrations during vehicle operation.

[0059] For example, referring to Figure 2, the auxiliary limit structure includes a fixed boss 7 and a fixing structure 8. Among them, the fixed boss 7 is arranged at the position between the EGR air inlet 104 and the fixed clamping groove 6 on the manifold body 1. Specifically, it can be a columnar structure integrally formed on the manifold body 1, and a first mounting hole 701 is provided on the fixed boss 7. The first mounting hole 701 is a threaded hole. And the fixing structure 8 is arranged in the middle of the EGR connecting pipe 2. See Figure 4 , which specifically includes a connecting plate 802 connected to the EGR connecting pipe 2 and a mounting plate 803 connected to the connecting plate 802. A second mounting hole 801 is provided on the mounting plate 803. In this way, during installation, the second mounting hole 801 on the mounting plate 803 is aligned with the first mounting hole 701 on the fixed boss 7, and then the bolt is tightened into the first mounting hole 701 and the second mounting hole 801, so as to realize the fastening of the mounting plate 803 and the fixed boss 7, and further realize the limit fixation of the middle part of the EGR connecting pipe 2 and the manifold body 1.

[0060] Furthermore, in this embodiment, the EGR connecting pipe 2 is a plastic structure. For example, the EGR connecting pipe 2 is injection molded with nylon and glass fiber, so that the EGR connecting pipe 2 has the ability of deformation adjustment. According to the characteristics of the deformable adjustment of the EGR connecting pipe 2, the transmission path and direction of the connecting pipe can be adjusted to achieve the effect of controlling the shape of the pipeline. Moreover, the adjustment range and angle are wide, and the flexibility is high, so that it can be adjusted according to the layout of different engines, meet the assembly requirements of different engines, and have better adaptability.

[0061] Specifically, see Figure 5 , in this embodiment, the EGR connecting pipe 2 includes a first piece 202 and a second piece 203 divided along its length direction. Both the first piece 202 and the second piece 203 are plastic structures formed by injection molding. For example, the materials of the first piece 202 and the second piece 203 are both nylon and glass fiber. Specifically, the materials of the first piece 202 and the second piece 203 can be PA66+GF30 or GF35. Such a setting makes the EGR connecting pipe 2 formed by combining the plastic first piece 202 and the second piece 203 also a plastic structure, having the ability of deformation adjustment, and can meet the assembly requirements of different engines.

[0062] Specifically, in this embodiment, the first piece 202 and the second piece 203 can be connected by vibration friction welding. Specifically, after the first piece 202 and the second piece 203 are butted, vibration friction welding is used for welding. This connection method can ensure the connection strength between the first piece 202 and the second piece 203, ensure the reliability of the combined EGR connecting pipe 2, and avoid air leakage points caused by bending of the EGR connecting pipe 2.

[0063] Furthermore, see Figure 5, in this embodiment, on one side of the first piece 202 and the second piece 203 where they are connected to each other, there are connecting pieces 204 extending outward. Among them, the connecting piece 204 on the first piece 202 is the first connecting piece, and the first connecting piece extends outward along the docking surface on the first piece 202, and the first connecting piece can make the docking surface area on the first piece 202 larger; similarly, the connecting piece 204 on the second piece 203 is the second connecting piece, and the second connecting piece extends outward along the docking surface on the second piece 203, and the second connecting piece can make the docking surface area on the second piece 203 larger; thus, through the first connecting piece and the second connecting piece, the docking area between the first piece 202 and the second piece 203 can be increased, making the docking between the first piece 202 and the second piece 203 more stable and the welding effect better. It should be noted that the ends of the first connecting piece and the second connecting piece both extend to a position flush with the end of the second reinforcing rib 205, avoiding extending into the clamping throat 201, so that when installing, the first connecting piece and the second connecting piece can also be used as components for limiting the fixed card slot 6.

[0064] 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 recorded in this specification.

[0065] The above embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be pointed out 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 should be subject to the appended claims.

Claims

1. An intake manifold assembly, characterized in that: include: A manifold body (1), comprising a pressure stabilizing chamber (101) and a plurality of branch pipes (102) in communication with the pressure stabilizing chamber (101); an EGR air inlet (104) in communication with the pressure stabilizing chamber (101) is provided on the manifold body (1); and a first connecting fitting (3) is provided on the EGR air inlet (104); An EGR connecting pipe (2), the EGR connecting pipe (2) being a plastic structure and having a first connecting piece (4) and a second connecting piece (5) respectively disposed at both ends thereof, and a clamping throat portion (201) being disposed on a side of the EGR connecting pipe (2) close to the second connecting piece (5); wherein: The first end of the EGR connecting pipe (2) is detachably connected to the first connecting fitting (3) via the first connecting piece (4), and the outlet of the EGR connecting pipe (2) is connected to the EGR air inlet (104); A fixed slot (6) is provided on one side of the manifold body (1) away from the EGR air inlet (104), and the second end of the EGR connecting pipe (2) is detachably clamped in the fixed slot (6) via the clamping throat (201).

2. The intake manifold assembly according to claim 1, characterized in that: The first connecting fitting (3) is a first connecting flange, the first connecting fitting (4) is a second connecting flange matching the first connecting flange, and the second connecting fitting (5) is a third connecting flange.

3. The intake manifold assembly according to claim 2, characterized in that: The first connecting flange is provided with an annular groove (301) and a limiting notch (302) communicating with the annular groove (301); a sealing ring (303) is embedded in the annular groove (301); and a supporting foot (304) embedded in the limiting notch (302) is fixed on the sealing ring (303).

4. The intake manifold assembly according to claim 1, characterized in that: The EGR connecting pipe (2) is provided with a second reinforcing rib (205) extending in the length direction, a gap is provided between the end of the second reinforcing rib (205) and the second connecting piece (5), and the clamping throat portion (201) is formed on the EGR connecting pipe (2) at the gap.

5. The intake manifold assembly according to claim 1, characterized in that: A fixing boss (7) is also provided on the manifold body (1) at a portion between the EGR air inlet (104) and the fixing groove (6), and a fixing structure (8) is provided on the EGR connecting pipe (2) that is detachably fixedly connected to the fixing boss (7).

6. The intake manifold assembly according to claim 5, characterized in that: The fixing boss (7) is provided with a first mounting hole (701); The fixing structure (8) comprises a connecting plate (802) and a mounting plate (803), wherein the connecting plate (802) is connected to the EGR connecting pipe (2), the mounting plate (803) is arranged on the connecting plate (802), and a second mounting hole (801) opposite to the first mounting hole (701) is arranged on the mounting plate (803); The first mounting hole (701) and the second mounting hole (801) are used for screwing bolts to tighten the fixing structure (8) and the fixing boss (7).

7. The intake manifold assembly according to claim 1, characterized in that: The EGR connecting pipe (2) comprises a first piece (202) and a second piece (203) divided along its length direction, the first piece (202) and the second piece (203) are both injection-molded plastic structures, and the first piece (202) and the second piece (203) are welded together to form the EGR connecting pipe (2).

8. The intake manifold assembly according to claim 7, characterized in that: The materials of the first sheet (202) and the second sheet (203) are both nylon and glass fiber.

9. The intake manifold assembly according to claim 7, characterized in that: A connecting piece (204) extending outward is provided on one side where the first piece (202) and the second piece (203) are connected to each other.

10. The intake manifold assembly according to claim 1, characterized in that: The first connecting piece (4) and the second connecting piece (5) are integrally formed on the EGR connecting pipe (2).

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