Intake manifold and engine

Abstract

The invention provides an intake manifold and an engine, and relates to the technical field of engines. A first air channel of an air inlet manifold body is in a U shape, an air inlet pipe is connected with the first air channel at the middle section of the first air channel, and a second air channel is connected to the first air channel at the downstream of the air flowing direction. The air outlet is an opening where the second air channel is connected with an engine inlet. The intake manifold body is formed by assembling an upper part and a lower part which are opposite to each other, and one air outlet is connected with at least two engine cylinder inlets. According to the technical scheme, the first air channel of the intake manifold body is arranged to be in the U shape, due to the fact that the appearance of the intake manifold body is long and thin, and at least two engine air cylinder inlets share one air outlet, the occupied space can be effectively reduced. In addition, the intake manifold main body is formed by assembling the upper part and the lower part which are opposite to each other, so that the manufacturing process of the intake manifold is simplified, and the manufacturing cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to an intake manifold and an engine. Background Art

[0002] The existing horizontally opposed intake manifold structure is as follows Figure 1 As shown, the intake manifold is used in internal combustion engines to evenly distribute air to the intake passages of each cylinder of the engine. The traditional horizontally opposed intake manifold consists of an intake port, a pressure stabilizing chamber, and two air passages on each side. The air enters the pressure stabilizing chamber from the intake port and is then distributed to the four air passages through the pressure stabilizing chamber. The above intake manifold structure has the following problems:

[0003] 1. The traditional air intake system takes up a large space in the vehicle, resulting in more space in the engine compartment, which may affect the layout of other components in the engine compartment;

[0004] 2. A larger intake manifold means heavier material usage, which increases the weight of the entire engine and has a negative impact on vehicle fuel economy;

[0005] 3. The space occupied by the intake manifold will also affect the overall design and performance of the vehicle. Because a compact engine compartment layout can reduce the wind resistance of the vehicle and improve the dynamic performance of the vehicle. If the space occupied by the intake manifold is too large, it may limit the flexibility of vehicle design;

[0006] 4. The manufacturing process is complicated and the cost is relatively high. Summary of the invention

[0007] An object of the present invention is to provide an intake manifold to solve the technical problem in the prior art that the intake manifold occupies a larger space.

[0008] A further object of the present invention is to improve the uniformity of cylinder charging.

[0009] Another object of the present invention is to provide an engine having the above-mentioned intake manifold.

[0010] In particular, the present invention provides an intake manifold, comprising an intake pipe and an intake manifold body, wherein the intake manifold body comprises:

[0011] A first air passage, wherein the first air passage is U-shaped, and the air inlet pipe is connected to the first air passage at a middle section thereof;

[0012] a second air passage, the second air passage being connected to the first air passage downstream of the gas flow direction;

[0013] and an air outlet, the air outlet being arranged as an opening connecting the second air passage with the engine cylinder;

[0014] The intake manifold body is assembled from two upper and lower opposite parts;

[0015] One of the air outlets is connected to at least two engine cylinder inlets.

[0016] Optionally, the second air channel has a plurality of sub-air channels, and the airflow entering the sub-air channels enters the cylinder through the air outlet.

[0017] Optionally, the intake manifold housing body is provided with at least one limiting structure, and the limiting structure is located at the air outlet of the second air passage, dividing the second air passage into a plurality of sub-air passages.

[0018] Optionally, after the intake manifold is assembled on the cylinder, the limiting structure is located between the inlets of two engine cylinders.

[0019] Optionally, each of the limiting structures is columnar.

[0020] Each of the limiting structures is provided with a bolt hole so that a bolt can be connected to the engine through the bolt hole.

[0021] Optionally, the intake manifold body includes a first shell and a second shell that cooperate with each other, the first shell and the second shell are both U-shaped, the first shell is provided with the air inlet, and the second shell is provided with the air outlet.

[0022] Optionally, a plurality of connection parts are provided on the first shell and the second shell, and the connection parts are connected to the engine.

[0023] Optionally, a plurality of first connection portions are provided on the second shell and arranged around each of the air outlets.

[0024] Optionally, the air intake pipe is arranged obliquely relative to the first shell.

[0025] Optionally, a first round chamfer is provided at a connection between the air intake pipe and the first shell, and a radius of the first round chamfer on a side where the air intake pipe forms an acute angle with the first shell is smaller than a radius of the first round chamfer on the other side.

[0026] Optionally, the distances from the air inlet to the corresponding cylinder inlets on both sides are equal. Optionally, a flow guide structure is provided at a position of the first shell defining the second air channel, so that the airflow evenly enters the plurality of sub-air channels.

[0027] In particular, the present invention also provides an engine, comprising the above-mentioned intake manifold.

[0028] In the present invention, the first air passage of the intake manifold body is U-shaped, the intake pipe is connected to the first air passage at the middle section thereof, and the second air passage is connected to the first air passage downstream of the gas flow. The air outlet is arranged as an opening for connecting the second air passage with the engine inlet. The intake manifold body is assembled from two parts facing each other up and down, and one air outlet is connected to at least two engine cylinder inlets. The above technical scheme arranges the first air passage of the intake manifold body in a U-shape. Since the intake manifold body is slender in shape and at least two engine cylinder inlets share one air outlet, the space occupied can be effectively reduced. In addition, the intake manifold body is assembled from two parts facing each other up and down, which simplifies the manufacturing process of the intake manifold and saves manufacturing costs.

[0029] Furthermore, in the present invention, the second air passage has a plurality of sub-air passages, and the airflow entering the sub-air passages enters the cylinder through the air outlet. The above technical solution eliminates the traditional multiple independent air passages and designs at least one integrated air passage, that is, the first air passage is connected with the multiple sub-air passages, and the integrated air passage can premix the air in advance, thereby improving the uniformity of the air intake of the engine cylinder.

[0030] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0032] Figure 1 is a schematic structural diagram of an intake manifold in the prior art;

[0033] Figure 2 is a schematic structural diagram of an intake manifold at an angle according to an embodiment of the present invention;

[0034] Figure 3 is a schematic structural diagram of an intake manifold from another angle according to an embodiment of the present invention;

[0035] Figure 4 is a schematic diagram of airflow of an intake manifold according to an embodiment of the present invention;

[0036] Figure 5 is a schematic structural diagram of an air outlet of an intake manifold according to an embodiment of the present invention;

[0037] Figure 6 is a schematic structural diagram of a second housing according to an embodiment of the present invention;

[0038] Figure 7 is a schematic structural diagram of a first housing according to an embodiment of the present invention;

[0039] Figure 8 is a schematic top view of an intake manifold according to one embodiment of the present invention;

[0040] Fig. 9 yes Figure 8 A schematic cross-sectional view along AA;

[0041] Fig.10 is a schematic cross-sectional view of an intake pipe according to an embodiment of the present invention;

[0042] Fig.11 is a schematic bottom view of an intake manifold according to one embodiment of the present invention;

[0043] Fig.12 yes Fig.11 A schematic cross-sectional view along BB;

[0044] Fig.13 yes Fig.11 Schematic cross-sectional view along CC.

[0045] Reference numerals:

[0046] 100-intake manifold, 10-intake manifold body, 20-intake pipe, 11-first shell, 12-second shell, 13-inlet port, 14-outlet port, 15-limiting structure, 16-first air duct, 17-second air duct, 171-sub-air duct, 111-second connecting part, 112-through hole, 113-flow guiding structure, 121-first connecting part, 122-second round chamfer, 21-first round chamfer. DETAILED DESCRIPTION

[0047] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0048] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0049] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or some of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may further include other features.

[0050] Unless otherwise clearly defined and limited, the terms "connection", "installation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. A person skilled in the art should be able to understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0051] Unless otherwise defined, all terms (including technical terms and scientific terms) used in the description of this embodiment have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0052] Figure 1 is a schematic structural diagram of an intake manifold 100 in the prior art. Figure 1 As shown, in the prior art, the intake manifold includes an air inlet, a pressure stabilizing chamber 2, and four air passages 3 located on the left and right sides of the pressure stabilizing chamber 1. The airflow enters the pressure stabilizing chamber 2 from the air inlet, and is then distributed to the four air passages 3 through the pressure stabilizing chamber 2. In the prior art, the intake manifold occupies a large space in the vehicle, resulting in more space in the engine compartment, which will affect the layout of other components in the engine compartment.

[0053] Figure 2 is a schematic structural diagram of an intake manifold 100 at one angle according to an embodiment of the present invention. Figure 3 FIG. 1 is a schematic structural diagram of an intake manifold 100 from another angle according to an embodiment of the present invention. Figure 2 and Figure 3As shown, in a specific embodiment, the intake manifold 100 includes an intake pipe 20, an intake manifold body 10, and the intake manifold body 10 includes a first air passage 16, a second air passage 17 and an air outlet 14. The first air passage 16 is U-shaped, and the intake pipe 20 is connected to the first air passage 16 in the middle section. Here, the first air passage 16 has an intake port 13 located in the middle thereof, and the intake port 13 is connected to the intake pipe 20. The airflow entering from the intake pipe 20 enters the first air passage 16 and flows to both ends of the first air passage 16 respectively. The second air passage 17 is connected to the first air passage 16 downstream of the gas flow. The air outlet 14 is set as an opening connecting the second air passage 17 with the inlet of the engine cylinder. The airflow after being diverted through the first air passage 16 enters the corresponding second air passage 17, and enters the engine cylinder through the air outlet 14. That is, after the airflow enters the first air passage 16 from the air inlet 13, it flows to both ends of the first air passage 16 to form two airflows, which enter the corresponding second air passages 17 respectively and enter the engine cylinder through the air outlet 14. The intake manifold body is assembled from two upper and lower opposite parts, and one air outlet 14 is connected to at least two engine cylinder inlets.

[0054] In this embodiment, the first air passage 16 of the intake manifold body 10 is arranged in a U shape. Since the intake manifold body 10 is slender in shape and at least two engine cylinder inlets share one air outlet, the space occupied can be effectively reduced. In addition, the intake manifold body is assembled from two opposite parts from top to bottom, which simplifies the manufacturing process of the intake manifold 100 and saves manufacturing costs.

[0055] Figure 4 is a schematic diagram of airflow of an intake manifold 100 according to an embodiment of the present invention, Figure 5 is a schematic structural diagram of the air outlet 14 of the intake manifold 100 according to an embodiment of the present invention, wherein: Figure 4 The arrow in the middle indicates the flow direction of the airflow. Figure 4 and Figure 5 , and see Figure 2 and Figure 3 The second air channel 17 has a plurality of sub-air channels 171, and the airflow entering the sub-air channel 171 enters the cylinder through the air outlet 14. That is, the airflow enters the second air channel 17 or each sub-air channel 171 of the second air channel 17 from the first air channel 16, and then enters the corresponding cylinder through the corresponding air outlet 14.

[0056] This embodiment eliminates the traditional multiple independent air passages and designs at least one integrated air passage, that is, the first air passage 16 is connected to multiple sub-air passages 171. The integrated air passage can premix the air in advance, thereby improving the uniformity of the engine cylinder intake.

[0057] In a preferred embodiment, each second air passage 17 has a plurality of sub-air passages 171, such as two, three or four. This embodiment is equivalent to replacing a plurality of independent air passages with a smaller number of integrated air passages, namely, the second air passages 17, which can premix the air and improve the stability of the engine cylinder intake.

[0058] See also Figure 4 In some embodiments, each second air passage 17 has two sub-air passages 171. This embodiment is equivalent to integrating the two air passages on the left and the two air passages on the right in the prior art, and converting the traditional four independent air passages into two integrated air passages, i.e., two second air passages 17. The two second air passages 17 can premix the air in advance, thereby improving the uniformity of the cylinder intake.

[0059] In some embodiments, a plurality of second air channels 17 are evenly arranged on both sides of the first air channel 16, and each second air channel 17 has the same number of sub-air channels 171. It can be understood that not only the same number of second air channels 17 are provided on the left and right sides of the first air channel 16, but also the same number of sub-air channels 171 are provided on the left and right sides of the first air channel 16. In other embodiments, different numbers of second air channels 17 may be provided on the left and right sides of the first air channel 16, and different numbers of sub-air channels 171 may be provided on each second air channel 17, which is determined according to design requirements.

[0060] In some embodiments, a second air channel 17 is disposed on the left and right sides of the first air channel 16, respectively. Figure 4 This embodiment is applicable to a four-cylinder engine. In other embodiments, two second air passages 17 may be respectively provided on the left and right sides of the first air passage 16, which is determined according to design requirements.

[0061] See also Figure 3 and Figure 4 In some embodiments, the intake manifold body 10 is provided with at least one limiting structure 15, which is located at the air outlet 14 of the second air passage 17, and divides the second air passage 17 into a plurality of sub-air passages 171. It can be understood that this embodiment divides the second air passage 17 by using the structure of the intake manifold body 10 itself, and the structure is relatively simple, and no independent air passage is required.

[0062] In some embodiments, each limiting structure 15 can divide the second air channel 17 into two sub-air channels 171. If one limiting structure 15 is provided at the second air channel 17, the second air channel 17 is divided into two sub-air channels 171. If two limiting structures 15 are provided at the second air channel 17, the second air channel 17 is divided into three sub-air channels 171, and so on.

[0063] In some embodiments, if the intake manifold body 10 has only one second air passage 17 with two sub-air passages 171, then the intake manifold body 10 only needs to be provided with one limiting structure 15. If the intake manifold body 10 has multiple second air passages 17 with multiple sub-air passages 171, then the intake manifold body 10 needs to be provided with multiple limiting structures 15. If the intake manifold body 10 has only one second air passage 17 with three or more sub-air passages 171, then the intake manifold body 10 also needs to be provided with multiple limiting structures 15.

[0064] In some embodiments, there are multiple limiting structures 15, and each second air channel 17 is provided with a limiting structure 15 to divide the corresponding second air channel 17 into two sub-air channels 171. In other embodiments, the arrangement of the limiting structures 15 can also be determined according to specific design requirements.

[0065] Figure 5 FIG. 1 is a schematic structural diagram of the air outlet 14 of the intake manifold 100 according to an embodiment of the present invention. Figure 5 As shown, and see Figure 3 In some embodiments, after the intake manifold 100 is assembled in the cylinder, the limiting structure 15 is located between the inlets of the two engine cylinders. Each limiting structure 15 is located in the middle of the length direction of the corresponding second air passage 17 to divide the second air passage 17 into two sub-air passages 171, and the length direction is parallel to the side of the first air passage 16. Here, the length direction of the second air passage 17 is consistent with the length direction of the air outlet 14, that is, Figure 5 Middle left and right direction.

[0066] In some embodiments, if a plurality of limiting structures 15 are provided at the second air channel 17, it is not necessary to provide the limiting structure 15 in the middle of the length direction of the second air channel 17. For example, if two limiting structures 15 are provided at the second air channel 17 to divide the second air channel 17 into three sub-air channels 171, then the two limiting structures 15 are respectively provided at one-third and two-thirds of the length direction of the second air channel 17, thereby equally dividing the second air channel 17 into three sub-air channels 171.

[0067] In some embodiments, the air outlet 14 is a cube, and each limiting structure 15 is located on the side of the target side of the air outlet 14 facing the middle position of the air outlet 14, so that the second air channel 17 can be divided and the air of the sub-air channels 171 of the second air channel 17 can be premixed. The target side extends along the length direction and is close to the first air channel 16. Figure 5 The limiting structure 15 is disposed below the upper side of the air outlet 14 , and the upper side is the side close to the first air channel 16 .

[0068] In a preferred embodiment, the limiting structure 15 is arranged at one third of the width direction of the air outlet 14, so that the second air channel 17 can be divided and the air in the sub-air channels 171 of the second air channel 17 can be premixed. Figure 5 The up and down directions in .

[0069] In some embodiments, four corners of the air outlet 14 are provided with rounded chamfers, so that the main body improves the uniformity of air intake.

[0070] In some embodiments, each limiting structure 15 is columnar, and each limiting structure 15 is provided with a bolt hole so that the bolt is connected to the engine through the bolt hole. In a preferred embodiment, the limiting structure 15 is cylindrical. In other embodiments, the limiting structure 15 can also be set to other shapes, such as a plate shape.

[0071] In some embodiments, each limiting structure 15 is provided with a bolt hole so that the bolt is connected to the engine through the bolt hole. The limiting structure 15 of this embodiment can not only divide the second air channel 17 and premix the air of the sub-air channel 171 of the second air channel 17, but also connect the engine, thereby reducing some unnecessary connection structures, simplifying the structure of the intake manifold 100, and making the structure of the intake manifold 100 more compact.

[0072] Figure 6 is a schematic structural diagram of the second housing 12 according to an embodiment of the present invention, Figure 7 FIG. 1 is a schematic structural diagram of a first housing 11 according to an embodiment of the present invention. Figure 6 and Figure 7 As shown, and see Figure 2 and Figure 3 In some embodiments, the intake manifold body 10 includes a first shell 11 and a second shell 12 that cooperate with each other. The first shell 11 and the second shell 12 are both U-shaped. The first shell 11 is provided with an air inlet 13, and the second shell 12 is provided with an air outlet 14. Here, the first shell 11 can be regarded as an upper shell, and the second shell 12 can be regarded as a lower shell.

[0073] See also Figure 2 and Figure 7 In some embodiments, a plurality of through holes 112 are provided on the first shell 11, and each through hole 112 corresponds to a limiting structure 15, so that bolts pass through the through holes 112, the corresponding bolt holes of the limiting structure 15 and the engine in sequence, thereby connecting the intake manifold 100 to the engine.

[0074] In some embodiments, the first shell 11 and the second shell 12 are connected by welding, which has a simple manufacturing process and low cost.

[0075] See also Figure 7 In some embodiments, the cross section of the air inlet 13 is bilaterally symmetrical, thereby ensuring the uniformity of air intake.

[0076] See also Figure 3 and Figure 5 In some embodiments, a plurality of connecting parts are provided on the first shell 11 and the second shell 12, and the connecting parts are connected to the engine. That is to say, the intake manifold 100 of this embodiment is not only connected to the engine through the limiting structure 15, but also connected to the engine through the plurality of connecting parts on the first shell 11 and the second shell 12, thereby improving the stability of the connection between the intake manifold body 10 and the engine. Here, bolt holes are provided on the connecting parts so that the bolts are connected to the engine through the bolt holes. In a preferred embodiment, a plurality of first connecting parts 121 are provided on the second shell 12, which are arranged on the peripheral side of each air outlet 14, so that the sealing between the intake manifold body 10 and the engine can be ensured, see Figure 5 .

[0077] In some embodiments, the number of the first connection parts 121 is four, wherein two first connection parts 121 are arranged on the side opposite to the air outlet 14 and the limiting structure 15, that is, Figure 5 The other two are arranged on both sides of the length direction of the air outlet 14, that is, Figure 5 The left and right sides of the intake manifold 10 are provided with the limiting structure 15, which is equivalent to having five connection points, thereby ensuring the sealing performance of the connection between the intake manifold body 10 and the engine. In other embodiments, the number of the first connection parts 121 can also be determined according to specific design requirements.

[0078] See also Figure 2 and Figure 7 In some embodiments, at least one second connection portion 111 is provided on the first housing 11, and the second connection portion 111 is connected to the engine. The first housing 11 and the second housing 12 of this embodiment both have a connection portion connected to the engine, thereby further improving the stability of the connection between the intake manifold housing 10 and the engine.

[0079] In some embodiments, there are multiple second connection parts 111, and the multiple second connection parts 111 are arranged at intervals in the middle of the first shell 11, while the first connection part 121 is arranged at the air outlet 14, which is equivalent to the two sides of the intake manifold body 10. The connection points are relatively uniform, thereby improving the stability of the connection between the intake manifold body 10 and the engine.

[0080] Figure 8 is a schematic top view of an intake manifold 100 according to an embodiment of the present invention, Fig. 9 yes Figure 8 Schematic cross-sectional view along AA in FIG. Figures 8 to 9 As shown, and see Figure 2 In some embodiments, the air intake pipe 20 is arranged obliquely relative to the first housing 11. Here, the air intake pipe 20, the first housing 11 and the second housing 12 are all connected by welding. The inclination angle between the air intake pipe 20 and the first housing 11 is determined according to specific design requirements.

[0081] In this embodiment, air enters from the middle of the intake manifold body 10 and is divided to the left and right sides, changing from thin to thick with a smooth arc transition, which helps to improve the uniformity of intake.

[0082] Fig.10 FIG. 2 is a schematic cross-sectional view of an intake pipe 20 according to an embodiment of the present invention. Fig.10 As shown, in some embodiments, a first round chamfer 21 is provided at the connection between the air intake pipe 20 and the first housing 11, and the radius of the first round chamfer 21 on one side where the air intake pipe 20 forms an acute angle with the first housing 11 is smaller than the radius of the first round chamfer 21 on the other side. It can be understood that the radius of the first round chamfer 21 on the curved side of the air intake pipe 20 is smaller than the radius of the other first round chamfer 21.

[0083] This embodiment adjusts the intake uniformity by the size of the first round chamfer 21 at the connection corner between the intake pipe 20 and the first shell 11, so as to avoid the situation where the intake resistance on the left side is small and the intake resistance on the right side is large due to the influence of the inclination angle of the intake pipe 20.

[0084] In some embodiments, the distances from the air intake port 13 to the corresponding cylinder inlets on both sides are equal.

[0085] See also Fig.10 In a preferred embodiment, the radius of the first round chamfer 21 on the left side is the reference R, and the radius of the first round chamfer 21 on the right side is 1.5-2.5R.

[0086] See also Figure 6 and Figure 7 A second round chamfer 122 is provided at the turning points of the first shell 11 and the second shell 12 , and the radii of the second round chamfer 122 at the turning points of the first shell 11 and / or the second shell 12 are different.

[0087] This embodiment adopts a variable second round chamfer 122 at the corner, which can control the size of the air intake cross section to achieve the purpose of adjusting the air intake uniformity. In a preferred embodiment, it is only necessary to set the second round chamfer 122 at the corner of the second shell 12, and the first shell 11 adopts a uniform round chamfer to avoid the first shell 11 adopting a variable round chamfer, which will affect the welding with the second shell 12 due to the uneven welding parting surface.

[0088] by Fig.10 The radius of the first round chamfer 21 on the left side is the reference R, see Figure 6 , Figure 6 The radius of the second round chamfer 122 at the top is R, the radius of the second round chamfer 122 at the left side of the top second round chamfer 122 is 2.5-3.5R, and the radius of the second round chamfer 122 at the left side is 1.5-2R. In other embodiments, the radius of the second round chamfer 122 at each corner of the second housing 12 can also be set according to specific design requirements.

[0089] by Fig.10 The radius of the first round chamfer 21 on the left side is the reference R, see Figure 7 , Figure 7 The radius of the second round chamfer 122 on the far right side is 1-1.5R, and the radius of the second round chamfer 122 on the side is 1.5-2.5R. In other embodiments, the radius of the second round chamfer 122 at each corner of the first housing 11 can also be set according to specific design requirements.

[0090] Fig.11 is a schematic bottom view of an intake manifold 100 according to an embodiment of the present invention, Fig.12 yes Fig.11 Schematic cross-sectional view along BB, Fig.13 yes Fig.11 A schematic cross-sectional view along CC, wherein: Fig.12 and Fig.13 The arrow in the middle indicates the direction of airflow. Fig.11 and Fig.12 As shown, in some embodiments, a guide structure 113 is provided at a position of the first shell 11 defining the second air channel 17 so that the airflow evenly enters the plurality of sub-air channels 171. Here, the guide structure 113 is specifically designed according to the space boundary limitation of the first shell 11.

[0091] In the case of a normal rectangular cross section, Fig.11 The left side of the two second air passages 17 in the middle and upper parts has more air intake and less pressure drop. Fig.12 and Fig.13 The cross-sectional flow guide structure 113 is designed to allow air to first enter the right air passages of the upper and lower second air passages 17, respectively, so that a uniform air intake effect can be achieved.

[0092] The present invention further provides an engine, the engine comprising the intake manifold 100 in any one of the above embodiments. The intake manifold 100 will not be described in detail here.

[0093] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. An intake manifold, comprising an intake pipe and an intake manifold body, wherein the intake manifold body comprises: A first air passage, wherein the first air passage is U-shaped, and the air inlet pipe is connected to the first air passage at a middle section thereof; a second air passage, the second air passage being connected to the first air passage downstream of the gas flow direction; and an air outlet, the air outlet being arranged as an opening connecting the second air passage with an inlet of a cylinder of the engine; It is characterized in that The intake manifold body is assembled from two upper and lower parts that are opposite to each other; One of the air outlets is connected to at least two engine cylinder inlets.

2. The intake manifold according to claim 1, characterized in that: The second air channel has a plurality of sub-air channels, and the airflow entering the sub-air channels enters the cylinder through the air outlet.

3. The intake manifold according to claim 2, characterized in that: The intake manifold body is provided with at least one limiting structure, and the limiting structure is located at the air outlet of the second air passage, dividing the second air passage into a plurality of sub-air passages.

4. The intake manifold according to claim 3, characterized in that: After the intake manifold is assembled on the cylinder, the limiting structure is located between the inlets of two engine cylinders.

5. The intake manifold according to claim 4, characterized in that: Each of the limiting structures is columnar, Each of the limiting structures is provided with a bolt hole so that a bolt can be connected to the engine through the bolt hole.

6. The intake manifold according to claim 5, characterized in that: The intake manifold body includes a first shell and a second shell that cooperate with each other. The first shell and the second shell are both U-shaped. The first shell is provided with the air inlet, and the second shell is provided with the air outlet.

7. The intake manifold according to claim 6, characterized in that: The first shell and the second shell are provided with a plurality of connection parts, and the connection parts are connected to the engine.

8. The intake manifold according to claim 7, characterized in that: The second shell is provided with a plurality of first connection parts, which are arranged around each of the air outlets.

9. The intake manifold according to claim 8, characterized in that: The air intake pipe is arranged obliquely relative to the first housing.

10. The intake manifold according to claim 9, characterized in that: A first round chamfer is provided at a connection between the air intake pipe and the first shell, and a radius of the first round chamfer on one side where the air intake pipe and the first shell form an acute angle is smaller than a radius of the first round chamfer on the other side.

11. The intake manifold according to claim 10, characterized in that: The distances from the air inlet to the corresponding cylinder inlets on both sides are equal.

12. The intake manifold according to claim 10, characterized in that: A flow guiding structure is provided at a position of the first shell defining and forming the second air channel, so that the air flow evenly enters the plurality of sub-air channels.

13. An engine, characterized in that: Comprising the intake manifold as claimed in any one of claims 1-12.

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