Intake manifold for engine and engine
By integrating EGR channels in the engine intake manifold, the problems of complex structure and long assembly cycle in the prior art are solved, and simpler structure, more efficient assembly and lower costs are achieved.
Patent Information
- Application Number
- CN202422258157.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-14
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-09-14
AI Technical Summary
The existing engine intake manifold assembly with EGR system has a complex structure and a long processing and assembly cycle.
By integrating the EGR channel on the manifold body, the EGR channel can be supplied with the intake manifold assembly, and parts such as flanges, seals, installation structures, and metal bushings have been eliminated.
Simplify the structure, reduce the number of parts, improve assembly efficiency, reduce material and management costs, and avoid air leakage caused by poor sealing.
Smart Images
Figure CN223018766U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of engines, and particularly to an intake manifold for an engine and an engine. 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. By absorbing a large amount of heat through 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] The connection between the existing EGR system and the intake manifold is usually to directly connect the outlet pipe of the EGR system 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 passages basically use metal pipes and are connected to the intake manifold through flanges, bolts, etc. However, due to the disadvantages of the metal pipe itself, such as complex processing and large weight, it will lead to high manufacturing costs and long cycles. Moreover, a sealing structure needs to be installed at the pipe connection during installation to ensure the sealing performance of the connection. This design will increase the assembly complexity of the intake manifold. Summary of the Utility Model
[0004] Based on this, the present utility model provides an intake manifold for an engine and an engine to solve the problems of complex structure and long processing and assembly cycle of the intake manifold assembly of an existing engine with an EGR system.
[0005] On the one hand, an intake manifold for an engine provided by the present utility model includes:
[0006] A manifold body, which includes an intake passage, a pressure stabilizing chamber connected to the intake passage, and a plurality of branch pipes communicating with the pressure stabilizing chamber. One end of the intake passage away from the pressure stabilizing chamber has a manifold intake port, and the manifold body is provided with an EGR intake port communicating with the manifold intake port at the intake passage.
[0007] An EGR passage, which includes a passage housing integrally provided on the manifold body and surrounding a passage groove with the outside of the manifold body, and a passage cover plate provided on the passage housing for covering the passage groove. Wherein, a connector is provided at the first end of the EGR passage, and the second end is connected to the EGR intake port.
[0008] In one embodiment, the channel housing is integrally injection-molded on the manifold body, and the channel cover plate is welded to the channel housing.
[0009] In one embodiment, the channel housing extends along the path of the intake passage and encloses the channel groove with the part of the manifold body located in the intake passage.
[0010] In one embodiment, a flow guiding wall inclined towards the EGR intake port is provided on the inner side of one end of the channel cover plate close to the EGR intake port.
[0011] In one embodiment, the connecting piece is integrally formed on the channel housing.
[0012] In one embodiment, the end of the intake passage far from the manifold intake port is connected to the middle of the side of the pressure stabilizing chamber far from the branch pipe.
[0013] In one embodiment, an EGR distributor is arranged in the manifold intake port, and the EGR intake port is opposite to and communicated with the EGR distributor.
[0014] In one embodiment, a plurality of reinforcing ribs are arranged on the manifold body.
[0015] In one embodiment, at least a part of the reinforcing ribs are connected between the outer sides of the manifold body and the channel housing.
[0016] On the other hand, the engine provided by the present utility model includes the intake manifold for an engine in any one of the above embodiments.
[0017] The present utility model has at least the following beneficial effects compared with the prior art:
[0018] For this intake manifold for an engine, by integrally arranging the EGR passage on the manifold body, the EGR passage can be supplied together with the intake manifold assembly, eliminating parts such as flanges, sealing rings, installation structures, and metal bushings required for connecting the EGR passage and the manifold body in the prior art. The number of parts is reduced, the assembly efficiency is improved, and the material cost, management cost, and labor cost are also reduced. It has good economic benefits and is also convenient for management. Moreover, it avoids the air leakage problem caused by poor sealing between the EGR passage and the EGR intake port of the manifold body. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic structural diagram of an intake manifold for an engine in one embodiment;
[0020] Figure 2 It is a disassembled schematic diagram of an intake manifold for an engine in one embodiment;
[0021] Figure 3 Schematic structural diagram of the removal of the channel cover plate for the intake manifold of an engine in an embodiment;
[0022] Figure 4 is Figure 1 Cross-sectional view taken along line A-A in
[0023] Reference numerals in the accompanying drawings of the specification include: manifold body 1, intake passage 101, pressure stabilizing chamber 102, branch pipe 103, manifold intake port 104, EGR intake port 105, lower manifold piece 106, upper manifold piece 107, EGR passage 2, passage housing 201, guide wall 2021, channel cover plate 202, channel groove 203, connecting member 3, EGR distributor 4. Detailed implementation manners
[0024] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to 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.
[0025] It should be noted that the illustrations provided in this embodiment only schematically illustrate the basic concept of the present invention.
[0026] 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 invention can be implemented. Any modification of the structure, change in the proportional relationship or adjustment of the size, without affecting the effects that the present invention 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 invention.
[0027] 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 simplifying the 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 to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0028] The EGR connecting pipe of the existing intake manifold usually uses a metal pipe and is connected to the manifold through fasteners such as flanges and bolts, which not only has a high manufacturing cost, large processing difficulty, but also complex assembly and long cycle.
[0029] In view of this, an embodiment of the present utility model provides an intake manifold for an engine, which includes:
[0030] A manifold body 1, which includes an intake passage 101, a pressure stabilizing chamber 102 connected to the intake passage 101, and a plurality of branch pipes 103 communicating with the pressure stabilizing chamber 102. One end of the intake passage 101 away from the pressure stabilizing chamber 102 has a manifold air inlet 104, and the manifold body 1 is provided with an EGR air inlet 105 communicating with the manifold air inlet 104 at the intake passage 101;
[0031] An EGR passage 2, which includes a passage housing 201 integrally provided on the manifold body 1 and surrounding a passage groove 203 with the outside of the manifold body 1, and a passage cover plate 202 provided on the passage housing 201 for covering the passage groove 203. Wherein, one end of the EGR passage 2 is provided with a connector 3, and the other end is connected to the EGR air inlet 105.
[0032] For the intake manifold for an engine provided by the embodiment of the present utility model, during use, the exhaust pipe of the EGR system is connected to the first end of the EGR passage 2, so that the engine exhaust gas can be discharged from the EGR system to the EGR passage 2, and flow along the EGR passage 2 to the manifold air inlet 104, so that the engine exhaust gas and the fresh intake air introduced from the manifold air inlet 104 are mixed in the intake pipe and then flow into the pressure stabilizing chamber 102, and are distributed to each branch pipe 103 and introduced into each cylinder of the engine, so as to achieve the purposes of reducing emissions, improving fuel efficiency, reducing carbon deposition, and improving ignition performance.
[0033] For the intake manifold for an engine according to the embodiment of the present utility model, by integrally providing the EGR passage 2 on the manifold body 1, the EGR passage 2 can be supplied with the intake manifold assembly, eliminating parts such as flanges, sealing rings, installation structures, and metal bushings required for connecting the EGR passage 2 and the manifold body 1 in the prior art, avoiding the cumbersome process of separately assembling the EGR passage 2 later, having good economy and being convenient for management, and also avoiding the air leakage problem caused by poor sealing between the EGR passage 2 and the EGR air inlet 105 of the manifold body 1.
[0034] The following will describe in detail the intake manifold for an engine provided by the embodiment of the present utility model with reference to the accompanying drawings.
[0035] According to Figure 1 An intake manifold for an engine exemplarily showing at least one embodiment of the present utility model, the intake manifold for an engine includes: a manifold body 1 and an EGR passage 2.
[0036] See Figure 2, the manifold body 1 includes an upper manifold piece 107 and a lower manifold piece 106. Both the upper manifold piece 107 and the lower manifold piece 106 are integrally injection-molded. For example, both the upper manifold piece 107 and the lower manifold piece 106 are injection-molded using nylon and fiberglass materials, and the upper manifold piece 107 and the lower manifold piece 106 are joined together by vibration friction welding. In this way, the process of injection molding plus friction welding facilitates the manufacturing and assembly of the manifold body 1, and has the advantages of light weight, high cost-effectiveness, easy processing and forming, etc.
[0037] See Figure 1 , in this embodiment, the upper manifold piece 107 and the lower manifold piece 106 are joined by welding to form an intake passage 101, a pressure stabilizing chamber 102, and multiple branch pipes 103.
[0038] Among them, see Figure 1 and Figure 2 , the intake passage 101 is located at the bottom of the manifold body 1. One end thereof is a manifold intake port 104, and the other end is connected to the pressure stabilizing chamber 102. The intake passage 101 is the main intake pipe of the intake manifold, and the manifold intake port 104 is the total intake port of the intake manifold, which is used to introduce the air-fuel mixture or fresh air into the pressure stabilizing chamber 102.
[0039] See Figure 1 , in this embodiment, the pressure stabilizing chamber 102 is arranged between the intake passage 101 and each branch pipe 103, and is mainly used to store a certain amount of air, playing a buffering role, reducing the occurrence of air snatching among the cylinders of the engine, and improving the efficiency and performance of the engine.
[0040] See Figure 1 , multiple branch pipes 103 are evenly distributed on the upper side of the pressure stabilizing chamber 102 and are all connected to the pressure stabilizing chamber 102, and the number of branch pipes 103 matches the number of cylinders of the engine. Each cylinder is correspondingly provided with a branch pipe 103. For example, Figure 1 an exemplary embodiment showing the manifold body 1 having four branch pipes 103 is presented, and each branch pipe 103 is provided with an air outlet.
[0041] Based on the above structural design of the manifold body 1, during use, the air-fuel mixture or fresh air is introduced into the intake passage 101 from the manifold intake port 104, and then flows into the pressure stabilizing chamber 102 along the intake passage 101. After the gas is evenly distributed to each branch pipe 103 in the pressure stabilizing chamber 102, it is then discharged outwards from the air outlets of each branch pipe 103 to each cylinder respectively, ensuring the intake uniformity of each cylinder of the engine.
[0042] Further, see Figure 1, one end of the intake passage 101 away from the manifold intake port 104 is connected to the middle of one side of the pressure stabilizing chamber 102 away from the branch pipe 103. That is to say, the intake passage 101 communicates with the middle position at the bottom of the pressure stabilizing chamber 102, so that the intake passage 101 can introduce the mixed gas into the middle of the pressure stabilizing chamber 102, ensuring that the mixed gas can be evenly dispersed around, so that the mixed gas flows evenly into each branch pipe 103, and ensuring the intake air uniformity of each cylinder of the engine.
[0043] Further, referring to Figure 1 and Figure 2 , in this embodiment, the manifold intake port 104 of the intake passage 101 faces upward, so as to facilitate the connection and assembly of the manifold intake port 104 with the components of the engine.
[0044] Correspondingly, referring to Figure 1 , to ensure that both ends of the intake passage 101 are open upward, in this embodiment, the intake passage 101 is integrally arranged in an arc shape. In order to improve the connection stability between the intake passage 101 and the pressure stabilizing chamber 102, a connecting plate is provided between the outside of the intake passage 101 and the outside of the pressure stabilizing chamber 102, and the connecting plate is provided with weight-reducing holes to reduce the weight of the manifold assembly.
[0045] Further, referring to Figure 1 , a fixing bracket (not labeled in the figure) is integrally arranged at the bottom of the manifold body 1. Through the fixing bracket, the connection and fixation of the manifold body 1 with the engine can be quickly realized, without the need to separately assemble a metal bracket for fixation, saving the development of the bracket and reducing the cost.
[0046] Further, referring to Figure 1 , a plurality of fixing points (not labeled in the figure) are also arranged on the upper part of the manifold body 1. The fixing points are through holes for the fixing bolts to pass through. Through the plurality of fixing points, the upper part of the manifold body 1 can be fixedly connected with the cylinder head, and the connection stability is good.
[0047] It should be understood that other necessary components are also arranged on the manifold body 1. For example, the mounting bracket of the carbon canister solenoid valve, the mounting brackets of various sensors, the clips for fixing the wire harness and pipeline, etc. They are all prior arts and will not be elaborated in this embodiment.
[0048] Referring to Figure 3 , in this embodiment, an EGR intake port 105 is arranged at the inner side of the manifold body 1 corresponding to its manifold intake port 104, and the EGR intake port 105 communicates with the manifold intake port 104. The EGR intake port 105 is used to introduce the engine exhaust gas transmitted by the EGR system into the manifold intake port 104, so that the engine exhaust gas is mixed with the air-fuel mixture or fresh air and then enters the pressure stabilizing chamber 102, so as to achieve the purposes of reducing emissions, improving fuel efficiency, reducing carbon deposition and improving ignition performance.
[0049] Further, referring to Figure 4 , an EGR distributor 4 is further provided inside the manifold air inlet 104. The EGR air inlet 105 is opposite to and communicated with the EGR distributor 4. The EGR distributor 4 may specifically adopt an existing EGR distributor, and the structure thereof will not be described in detail in this embodiment. With such a setting, through the EGR distributor 4, fresh intake air and engine exhaust gas can be fully and evenly mixed, improving the stability of the intake air, optimizing combustion, and enhancing the engine economy and emissions.
[0050] Referring to Figure 1 and Figure 3 , in this embodiment, the EGR passage 2 is provided on one side of the manifold body 1 where the EGR air inlet 105 is opened, and is communicated with the EGR air inlet 105 to form a passage for conveying engine exhaust gas on the manifold body 1.
[0051] Specifically, referring to Figure 2 and Figure 3 , the EGR passage 2 includes a passage housing 201 and a passage cover plate 202. Among them, the passage housing 201 is integrally provided on the manifold body 1. For example, the passage housing 201 is integrally injection-molded with the upper manifold piece 107. And, a passage groove 203 is formed between the outer side wall of the passage housing 201 and the manifold body 1. The passage groove 203 at least covers the EGR air inlet 105. For example, referring to Figure 3 , the left end of the passage groove 203 is just opposite to the EGR air inlet 105, so that the passage groove 203 is communicated with the EGR air inlet 105.
[0052] Referring to Figure 2 , the passage cover plate 202 is provided on the passage housing 201 for covering the passage groove 203. Specifically, the contour of the passage cover plate 202 matches the shape of the notch of the passage groove 203. When the passage cover plate 202 covers the passage groove 203, the passage groove 203 can be closed to form a flow passage for guiding engine exhaust gas. More specifically, the passage cover plate 202 and the passage housing 201 may specifically be connected by vibration friction welding.
[0053] Referring to Figure 1 and Figure 3 , the EGR passage 2 formed by the passage housing 201 and the passage cover plate 202 has two ends. A connector 3 is provided at the first end. The connector 3 may specifically be a flange member. Through the flange member, the EGR passage 2 is connected to the outlet pipe of the EGR system to ensure the connection stability between the two, so that the engine exhaust gas can be smoothly introduced into the EGR passage 2; the second end is communicated with the EGR air inlet 105 to ensure that the exhaust gas in the EGR passage 2 can be introduced into the intake passage 101.
[0054] Further, referring to Figure 3 , in this embodiment, the connecting member 3 is integrally formed on the channel housing 201, for example, integrally injection molded. This arrangement can avoid leakage problems caused by poor welding quality between the connecting member 3 and the EGR passage 2, resulting in better airtightness.
[0055] Based on the EGR passage 2 designed with the above structure, the intake manifold structure for this engine is simpler. During injection molding, only three parts, namely the upper manifold piece 107, the lower manifold piece 106, and the channel cover plate 202, are required. The connecting flange, sealing ring, mounting bolts, metal bushings, and other parts between the EGR passage 2 and the intake manifold are eliminated, reducing the number of parts, making the structure simpler, assembly more convenient, improving the assembly efficiency, reducing the labor cost. Moreover, the EGR passage 2 is supplied with the intake manifold assembly, avoiding the cumbersome process of separately assembling the EGR passage 2 later, having good economy and being convenient for management.
[0056] Further, referring to Figure 3 , in this embodiment, the channel housing 201 extends along the path of the intake passage 101. That is to say, the channel housing 201 is arranged as an arc-shaped structure matching the arc path of the intake passage 101 and is correspondingly arranged outside the intake passage 101, so that the channel housing 201 can enclose a channel groove 203 with the part of the manifold body 1 located in the intake passage 101. With this arrangement, the structure of the EGR passage 2 is simpler and more compact, the layout is more reasonable, the flow direction is smooth, which is beneficial to processing and assembly.
[0057] In this embodiment, a flow guiding wall 2021 inclined towards the EGR air inlet 105 is provided on the inner side of one end of the channel cover plate 202 close to the EGR air inlet 105. Specifically, referring to Figure 4 , the first end of the channel cover plate 202 is directly opposite to the upper side of the EGR air inlet 105. Then correspondingly, the part of the channel cover plate 202 located at the first end of the EGR passage 2 can be gradually inclined downward, so that the inner wall of its first end gradually inclines towards the direction of the EGR air inlet 105, and this inclined inner wall is the flow guiding wall 2021. With this arrangement, the flow guiding wall 2021 can guide the engine exhaust gas flowing to the first end of the EGR passage 2 downward into the EGR air inlet 105, enabling the engine exhaust gas to enter the intake passage 101 more smoothly and making the engine operation more smooth.
[0058] Referring to Figure 1 , in some embodiments, a plurality of reinforcing ribs 106 are provided on the surface of the manifold body 1, and each reinforcing rib can be arranged in a crisscross manner. The reinforcing ribs 106 can improve the overall modal and structural strength of the manifold body 1 and enhance the NVH characteristics.
[0059] Further, in this embodiment, at least part of the reinforcing ribs are connected between the outside of the manifold body 1 and the channel housing 201. For example, referring to Figure 1 , the reinforcing ribs on the intake passage 101 located on one side of the EGR passage 2 are arranged in a direction intersecting with the extending direction of the EGR passage 2, so that each reinforcing rib on this side can connect the manifold body 1 and the channel housing 201, improving the connection stability between the EGR passage 2 and the manifold body 1.
[0060] In addition, the embodiment of the present utility model further provides an engine, which includes the intake manifold for an engine in any of the above embodiments.
[0061] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of 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.
[0062] 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 noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications 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 for an engine, characterized in that: include: A manifold body (1), comprising an air intake passage (101), a pressure stabilizing chamber (102) connected to the air intake passage (101), and a plurality of branch pipes (103) in communication with the pressure stabilizing chamber (102); an end of the air intake passage (101) away from the pressure stabilizing chamber (102) is provided with a manifold air intake port (104); and the manifold body (1) is provided with an EGR air intake port (105) in communication with the manifold air intake port (104) at the air intake passage (101); An EGR channel (2) comprises a channel shell (201) which is integrated on the manifold body (1) and forms a channel groove (203) with the outer side of the manifold body (1), and a channel cover plate (202) which is arranged on the channel shell (201) and is used to cover the channel groove (203), wherein a connecting piece (3) is arranged at the first end of the EGR channel (2), and a second end is connected to the EGR air inlet (105).
2. The engine intake manifold according to claim 1, characterized in that: The channel shell (201) is integrally injection-molded on the manifold body (1), and the channel cover plate (202) is welded to the channel shell (201).
3. The engine intake manifold according to claim 1, characterized in that: The channel housing (201) is arranged to extend along the path of the air inlet channel (101), and together with the portion of the manifold body (1) located in the air inlet channel (101), forms the channel groove (203).
4. The engine intake manifold according to claim 1, characterized in that: A guide wall (2021) inclined in the direction of the EGR air inlet (105) is provided on the inner side of one end of the channel cover plate (202) close to the EGR air inlet (105).
5. The engine intake manifold according to claim 1, characterized in that: The connecting piece (3) is integrally formed on the channel housing (201).
6. The engine intake manifold according to claim 1, characterized in that: One end of the air inlet (101) away from the manifold air inlet (104) is connected to the middle of a side of the pressure stabilizing chamber (102) away from the branch pipe (103).
7. The engine intake manifold according to claim 1, characterized in that: An EGR distributor (4) is disposed in the manifold air inlet (104), and the EGR air inlet (105) is opposite to and communicates with the EGR distributor (4).
8. The engine intake manifold according to claim 1, characterized in that: A plurality of reinforcing ribs are arranged on the manifold body (1).
9. The engine intake manifold according to claim 8, characterized in that: At least a portion of the reinforcing ribs is connected between the manifold body (1) and the outer side of the channel shell (201).
10. An engine, characterized in that: An engine intake manifold comprising any one of claims 1 to 9.