Air inlet device for engine and engine

Abstract

The utility model provides an air inlet device for an engine and the engine, the air inlet device comprises a pressure stabilizing cavity, the pressure stabilizing cavity comprises a first side wall and a second side wall, the first side wall and the second side wall face each other in the transverse direction, and the first side wall and the second side wall are respectively provided with a plurality of air conveying ends; the throttle valve is mounted at the top of the pressure stabilizing cavity and is suitable for being communicated with an air inlet of an engine; the pipe lengths of the multiple intake manifolds are equal, the first ends of the intake manifolds are communicated with one gas transmission end, the second ends of the intake manifolds extend into a cylinder hole of a cylinder of the engine, and the lengths of the parts, extending into the cylinder hole, of the intake manifolds are equal, so that under the condition that the throttle valve is opened, the air flows out of the pressure stabilizing cavity; the flow and the flow speed of airflow flowing into each air cylinder through each air inlet manifold are the same.

Description

Technical Field

[0001] At least one embodiment of the present utility model relates to the technical field of internal combustion engines, and particularly relates to an intake device for an engine and an engine. Background Art

[0002] As an important component of an engine, the structural design of the intake device has an important impact on the performance of the engine. For existing intake devices for multi-cylinder engines, especially those applied to multi-cylinder engines with horizontally opposed or V-type layouts, common designs include non-steady-pressure-chamber types or intake devices with double throttle valves and double intake manifolds.

[0003] However, the above two types of intake devices usually have the following defects:

[0004] For the non-steady-pressure-chamber type of intake device: This type of intake device is commonly used in naturally aspirated engines. The intake manifold branches lead to the inlet of each cylinder head intake port and converge somewhere in the middle. There is no steady-pressure-chamber structure and it is directly connected to the throttle valve. Although this type of intake device can significantly reduce the overall volume and weight of the intake manifold, without a steady-pressure-chamber design, the intake air fluctuation is large. And because there is only one throttle valve and the distances from the throttle valve to the inlet of each cylinder intake port are different, it is difficult to design the lengths of each branch pipe to be the same. Especially in engines with a large number of cylinders and a large cylinder diameter, the differences in the lengths of the branch pipes leading to each cylinder are more obvious. Due to the existence of the intake pulse effect, the differences in the lengths of the branch pipes result in inconsistent intake air volumes for each cylinder, and further lead to inconsistent powers for each cylinder. Here, the intake pulse effect refers to the intake pressure wave that appears in the intake manifold based on the frequency of the engine intake valve opening for suction.

[0005] For the intake device with double throttle valves and double intake manifolds, this type of intake device has two identical intake manifolds, which increases the overall weight of the engine. And due to reasons such as sample differences in the design of the double throttle valves, the opening angles of the two throttle valves may be inconsistent, resulting in differences in the intake air volumes on both sides of the engine. Summary of the Utility Model

[0006] In view of this, the present utility model provides an intake device for an engine, such that the flow rate and flow velocity of the air flowing into each cylinder are the same.

[0007] According to an embodiment of the present invention, there is provided an intake device for an engine, including: a pressure stabilizing chamber, including a first side wall and a second side wall facing each other in the lateral direction, and a plurality of air delivery ends are respectively arranged on the first side wall and the second side wall; a throttle valve, installed on the top of the pressure stabilizing chamber and adapted to communicate with an air inlet of the engine; and a plurality of intake manifolds, the pipe lengths of the plurality of intake manifolds are equal, a first end of the intake manifold is communicated with one of the air delivery ends, a second end of the intake manifold extends into a cylinder bore of a cylinder of the engine, and the lengths of the parts of the intake manifold extending into the cylinder bore are equal, so that when the throttle valve is opened, the flow rate and flow velocity of the air flow flowing out of the pressure stabilizing chamber and flowing into each cylinder through each intake manifold are the same.

[0008] According to an embodiment of the present invention, the first end of each intake manifold connected to the first side wall is inclined towards the geometric center of the first side wall, and the first end of each intake manifold connected to the second side wall is inclined towards the geometric center of the second side wall.

[0009] According to an embodiment of the present invention, both the first side wall and the second side wall are configured as substantially arc-shaped curved surfaces recessed towards the inside of the pressure stabilizing chamber.

[0010] According to an embodiment of the present invention, the plurality of intake manifolds are symmetrically connected to the pressure stabilizing chamber with the geometric center of the top surface of the pressure stabilizing chamber as the center of symmetry.

[0011] According to an embodiment of the present invention, both the first side wall and the second side wall are configured as substantially arc-shaped curved surfaces with the middle recessed towards the inside of the pressure stabilizing chamber.

[0012] According to an embodiment of the present invention, each intake manifold extends into the cylinder bore through the cylinder head of the cylinder to communicate with the inside of the cylinder.

[0013] According to an embodiment of the present invention, the number of cylinders of the intake device is greater than or equal to 6.

[0014] According to an embodiment of the present invention, the throttle valve is installed at the geometric center position of the engine.

[0015] According to an embodiment of the present invention, there is provided an engine, including: a plurality of cylinders; the intake device described in the above embodiment, each intake manifold of the intake device extends into one of the cylinders respectively; and an air inlet, connected to the throttle valve of the intake device.

[0016] According to an embodiment of the present invention, the plurality of cylinders are arranged horizontally opposed or in a V shape.

[0017] An intake device for an engine according to the above embodiment of the present utility model is provided with a plurality of intake manifolds having equal pipe lengths. The first end of each intake manifold is communicated with a gas transmission end, and the second end of the intake manifold extends into the cylinder bore of a cylinder of the engine, and the lengths of the portions of each intake manifold extending into the cylinder bore are equal, so that when the throttle valve is opened, the flow rate and flow velocity of the air flow flowing out of the pressure stabilizing cavity and flowing into each cylinder through each intake manifold are the same. Description of the Drawings

[0018] Figure 1 is a top view of the installation of the intake device for an engine according to the embodiment of the present utility model and a cylinder;

[0019] Figure 2 is a front view of the installation of the intake device for an engine according to the embodiment of the present utility model and a cylinder; and

[0020] Figure 3 is Figure 1 a cross-sectional view taken along the direction A-A.

[0021] In the figure:

[0022] 1 - pressure stabilizing cavity; 11 - first side wall; 12 - second side wall; 13 - gas transmission end;

[0023] 2 - throttle valve;

[0024] 3 - intake manifold; 31 - first end; 32 - second end;

[0025] 4 - cylinder; 41 - cylinder head; 42 - cylinder bore. Detailed Embodiment

[0026] In order to make the purpose, technical solution and advantages of the present utility model clearer and more understandable, the following further elaborates on the present utility model in detail with reference to specific embodiments and the accompanying drawings.

[0027] According to an inventive concept of one aspect of the present utility model, an intake device for an engine is provided, including: a pressure stabilizing cavity including a first side wall and a second side wall facing each other in the lateral direction, and a plurality of gas transmission ends are respectively provided on the first side wall and the second side wall; a throttle valve installed on the top of the pressure stabilizing cavity and adapted to be communicated with the intake port of the engine; and a plurality of intake manifolds having equal pipe lengths, the first end of the intake manifold is communicated with a gas transmission end, the second end of the intake manifold extends into the cylinder bore of a cylinder of the engine, and the lengths of the portions of the intake manifold extending into the cylinder bore are equal, so that when the throttle valve is opened, the flow rate and flow velocity of the air flow flowing out of the pressure stabilizing cavity and flowing into each cylinder through each intake manifold are the same.

[0028] Figure 1is a top view of the installation of the intake device for an engine and a cylinder according to an embodiment of the present utility model; Figure 2 is a front view of the installation of the intake device for an engine and a cylinder according to an embodiment of the present utility model; Figure 3 is Figure 1 a cross-sectional view taken along the A-A direction.

[0029] According to an exemplary embodiment of the present utility model, please refer to Figures 1 - 3 , there is provided an intake device for an engine, including a pressure stabilizing chamber 1, a throttle valve 2, and a plurality of intake manifolds 3. The pressure stabilizing chamber 1 includes a first side wall 11 and a second side wall 12 facing each other in the lateral direction, and a plurality of air delivery ends 13 are respectively provided on the first side wall 11 and the second side wall 12. The throttle valve 2 is installed on the top of the pressure stabilizing chamber 1 and is adapted to communicate with the intake port of the engine. The pipe lengths of the plurality of intake manifolds 3 are equal, the first end 31 of each intake manifold 3 communicates with one air delivery end 13, the second end 32 of the intake manifold 3 extends into the cylinder bore 42 of a cylinder 4 of the engine, and the lengths of the portions of each intake manifold 3 extending into the cylinder bore 42 are equal, so that when the throttle valve 2 is opened, the flow rate and flow velocity of the air flow flowing out from the pressure stabilizing chamber 1 and flowing into each cylinder 4 through each intake manifold 3 are the same.

[0030] In this embodiment, a plurality of intake manifolds 3 with equal pipe lengths are provided. The first end 31 of each intake manifold 3 communicates with one air delivery end 13, the second end 32 of the intake manifold 3 extends into the cylinder bore 42 of a cylinder 4 of the engine, and the lengths of the portions of each intake manifold 3 extending into the cylinder bore 42 are equal, so that when the throttle valve 2 is opened, the flow rate and flow velocity of the air flow flowing out from the pressure stabilizing chamber 1 and flowing into each cylinder 4 through each intake manifold 3 are the same.

[0031] Among them, as the throttle valve 2 is opened, an intake pressure wave is generated inside the intake manifold 3. By selecting a plurality of intake manifolds 3 with equal and appropriate lengths, the charging efficiency inside the cylinder 4 can be improved by using this pressure wave.

[0032] In some exemplary embodiments, refer to Figures 1 - 2 , the first end 31 of each intake manifold 3 connected to the first side wall 11 is inclined towards the geometric center of the first side wall 11, and the first end 31 of each intake manifold 3 connected to the second side wall 12 is inclined towards the geometric center of the second side wall 12.

[0033] Through the above setting method, the plurality of intake manifolds 3 connected to the first side wall 11 converge at the geometric center of the first side wall 11. Similarly, the plurality of intake manifolds 3 connected to the second side wall 12 converge at the geometric center of the second side wall 12.

[0034] In some exemplary embodiments, refer toFigure 1 The first side wall 11 and the second side wall 12 are both configured as substantially arc-shaped curved surfaces that are recessed toward the inside of the pressure stabilizing chamber 1.

[0035] With the above-described setting method, since the plurality of intake manifolds 3 connected to the first side wall 11 converge at the geometric center of the first side wall 11, by configuring the first side wall 11 as a substantially arc-shaped curved surface that is recessed toward the inside of the pressure stabilizing chamber 1, the distance from the first end 31 of each intake manifold 3 connected to the first side wall 11 to the corresponding cylinder bore 42 is the same, so that the tube lengths of each intake manifold 3 connected to the first side wall 11 are the same. Similarly, since the plurality of intake manifolds 3 connected to the second side wall 12 converge at the geometric center of the second side wall 12, by configuring the second side wall 12 as a substantially arc-shaped curved surface that is recessed toward the inside of the pressure stabilizing chamber 1, the distance from the first end 31 of each intake manifold 3 connected to the second side wall 12 to the corresponding cylinder bore 42 is the same, so that the tube lengths of each intake manifold 3 connected to the second side wall 12 are the same.

[0036] In some exemplary embodiments, referring to Figure 1 ,the plurality of intake manifolds 3 are symmetrically connected to the pressure stabilizing chamber 1 with the geometric center of the top surface of the pressure stabilizing chamber 1 as the center of symmetry.

[0037] With the above-described setting method, the consistency of the flow rate and flow velocity of the air flow flowing into the plurality of cylinders 4 through the plurality of intake manifolds 3 is further improved.

[0038] In some exemplary embodiments, referring to Figure 1 ,the first side wall 11 and the second side wall 12 are both configured as substantially arc-shaped curved surfaces that are recessed toward the inside of the pressure stabilizing chamber 1 in the middle.

[0039] With the above-described setting method, in the case where the plurality of intake manifolds 3 are symmetrically connected to the pressure stabilizing chamber 1 with the geometric center of the top surface of the pressure stabilizing chamber 1 as the center of symmetry, the distance from the first end 31 of each intake manifold 3 connected to the first side wall 11 to the corresponding cylinder bore 42 is the same, and at the same time, the distance from the first end 31 of each intake manifold 3 connected to the second side wall 12 to the corresponding cylinder bore 42 is the same.

[0040] In some exemplary embodiments, referring to Figures 1 - 3 ,each intake manifold 3 extends into the cylinder bore 42 through the cylinder head 41 of the cylinder 4 to communicate with the inside of the cylinder 4.

[0041] In some exemplary embodiments, referring to Figure 1 ,the number of cylinders 4 of the intake device is greater than or equal to 6.

[0042] It should be noted that the intake device of this embodiment is particularly applicable to engines with the number of cylinders 4 greater than or equal to 6.

[0043] In some exemplary embodiments, referring to Figure 1 , the throttle valve 2 is installed at the geometric center of the engine.

[0044] The intake device of this embodiment has the following advantages:

[0045] 1. By setting intake manifolds 3 with equal pipe lengths and making the lengths of the parts of each intake manifold 3 extending into the cylinder bore 42 equal, the consistency of the flow rate and velocity of the air flow flowing into each cylinder 4 of the engine is improved, which is beneficial to improving the consistency of the power of each cylinder 4 of the engine and enhancing the driving experience.

[0046] 2. The multiple intake manifolds 3 are symmetrically connected to the pressure stabilizing chamber 1 with the geometric center of the top surface of the pressure stabilizing chamber 1 as the center of symmetry, further improving the consistency of the flow rate and velocity of the air flow flowing into each cylinder 4 of the engine, and thus further improving the consistency of the power of each cylinder 4 of the engine.

[0047] 3. The structure of the pressure stabilizing chamber 1 and the connection relationship between the pressure stabilizing chamber 1 and the intake manifolds 3 make the structure of the engine more compact.

[0048] According to an exemplary embodiment of the present invention, an engine is provided, which includes a plurality of cylinders 4, the intake device described in the above embodiment, and an air inlet. Each intake manifold 3 of the intake device described in the above embodiment extends into a cylinder 4 respectively. The air inlet is connected to the throttle valve 2 of the intake device.

[0049] Through the above setting method, the consistency of the flow rate and velocity of the air flow flowing into each cylinder 4 of the engine is improved, which is beneficial to improving the consistency of the power of each cylinder 4 of the engine and enhancing the driving experience.

[0050] In some exemplary embodiments, the multiple cylinders 4 are arranged horizontally opposed or in a V - shape.

[0051] It should be noted that the intake device of this embodiment is particularly applicable to engines in which the multiple cylinders 4 are arranged horizontally opposed or in a V - shape.

[0052] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An air intake device for an engine, characterized in that: include: A pressure stabilizing chamber (1) comprises a first side wall (11) and a second side wall (12) facing each other in a transverse direction, wherein a plurality of gas delivery ends (13) are respectively arranged on the first side wall (11) and the second side wall (12); A throttle valve (2) is mounted on the top of the pressure stabilizing chamber (1) and is suitable for communicating with the air inlet of the engine; as well as A plurality of intake manifolds (3), the plurality of intake manifolds (3) have equal lengths, a first end (31) of the intake manifold (3) is connected to one of the gas delivery ends (13), a second end (32) of the intake manifold (3) extends into a cylinder hole (42) of a cylinder (4) of the engine, and the lengths of the portions of the intake manifold (3) extending into the cylinder hole (42) are equal, so that when the throttle valve (2) is opened, the flow rate and flow velocity of the airflow flowing out of the pressure stabilizing chamber (1) and flowing into each of the cylinders (4) through each of the intake manifolds (3) are the same.

2. The air intake device according to claim 1, characterized in that: The first end (31) of each of the intake manifolds (3) connected to the first side wall (11) is inclined toward the geometric center of the first side wall (11), and the first end (31) of each of the intake manifolds (3) connected to the second side wall (12) is inclined toward the geometric center of the second side wall (12).

3. The air intake device according to claim 2, characterized in that: The first side wall (11) and the second side wall (12) are both configured as substantially arc-shaped curved surfaces that are recessed toward the inner side of the pressure-stabilizing chamber (1).

4. The air intake device according to claim 2, characterized in that: The plurality of intake manifolds (3) are centrally symmetrically connected to the pressure stabilizing chamber (1) with the geometric center of the top surface of the pressure stabilizing chamber (1) as the center of symmetry.

5. The air intake device according to claim 4, characterized in that: The first side wall (11) and the second side wall (12) are both configured as substantially arc-shaped curved surfaces with the middle portions being recessed toward the inner side of the pressure-stabilizing chamber (1).

6. The air intake device according to claim 1, characterized in that: Each of the intake manifolds (3) extends into the cylinder hole (42) through the cylinder head (41) of the cylinder (4) so ​​as to communicate with the interior of the cylinder (4).

7. The air intake device according to claim 1, characterized in that: The number of cylinders (4) of the air intake device is greater than or equal to 6.

8. The air intake device according to claim 1, characterized in that: The throttle valve (2) is installed at the geometric center of the engine.

9. An engine, characterized in that: include: A plurality of cylinders (4); The air intake device according to any one of claims 1 to 8, wherein each intake manifold (3) of the air intake device extends into one of the cylinders (4); and The air inlet is connected to the throttle valve (2) of the air inlet device.

10. The engine according to claim 9, characterized in that The plurality of cylinders (4) are arranged horizontally opposite to each other or in a V-shape.

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