Engine air inlet device
By designing an elliptical intake manifold and a large-angle neck structure, the problem of volume and weight increase in uniformity and fluidity of the intake manifold is solved, and the effect of simplified manufacturing and aesthetics is achieved.
Patent Information
- Application Number
- CN202422929145.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-11-29
AI Technical Summary
While increasing uniformity and reducing flow resistance, the existing intake manifolds lead to an increase in engine volume and weight, increasing manufacturing difficulty, and affecting aesthetics.
An engine air intake device is designed, using a special structure between the intake manifold and the intake manifold, including an oval-like inner cavity and a neck angle greater than 150°, and is connected in combination with a flange to ensure that the airflow is evenly distributed to each cylinder, reducing flow resistance and simplifying manufacturing.
Air flow uniformity and flow smoothness are achieved, the weight and volume of the intake system are reduced, the manufacturing process is simplified, while maintaining aesthetics and flow performance.
Smart Images
Figure CN223256972U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of engine technology, in particular to an engine air intake device Background Art
[0002] The intake manifold is located between the throttle and the engine's intake valves. It's called a manifold because after air enters the throttle and passes through the manifold's buffer system, the air flow path diverges here. These flow paths correspond to the number of cylinders in the engine—for example, a four-cylinder engine has four manifolds, while a five-cylinder engine has five—directing air to each cylinder. The intake manifold must distribute air, fuel mixture, or clean air as evenly as possible to each cylinder. To achieve this, the lengths of the manifold's gas flow paths should be as uniform as possible. To minimize air flow resistance and maximize intake capacity, the manifold's interior should be smooth.
[0003] The uniformity of the intake air can be increased by increasing the straight section of the intake manifold, but as the intake manifold grows, its volume and weight will increase, affecting the appearance of the engine and increasing the difficulty of manufacturing. Utility Model Content
[0004] In order to solve the above problems, the utility model provides an engine air intake device, which can ensure the uniformity of the intake air and has a simple structure, can reduce the weight and volume of the intake system, and reduce the difficulty of manufacturing and installation.
[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0006] An engine intake device comprises an intake pipe and an engine cylinder head, wherein the intake pipe comprises an intake manifold, and a plurality of intake manifolds are connected to each other at the bottom of the intake manifold, and one end of the intake manifold away from the intake manifold is conductively connected to the engine cylinder head, and one end of the intake manifold away from the engine cylinder head is provided with a rounded corner, and the end of the intake manifold away from the rounded corner is an inlet end, and the inlet end is provided with an inlet section, and an intake connecting pipe is provided at the end of the inlet section away from the intake manifold, and the end of the inlet section away from the intake manifold is inclined toward the direction away from the engine cylinder head, so that the side of the intake manifold away from the engine cylinder head and the side of the inlet section away from the engine cylinder head form a neck angle α greater than 150°.
[0007] Furthermore, the cross section of the inner cavity of the intake manifold is an elliptical structure, and the intake manifold is arranged on the short side of the intake manifold.
[0008] Furthermore, the ratio of the long side h of the inner cavity of the intake manifold to the width D of the intake manifold is greater than or equal to 2.7; and the fillet radius R and the long side h of the inner cavity of the intake manifold satisfy 2 / 3h≤R≤h.
[0009] Furthermore, the engine cylinder head is arranged on the engine, and the first cylinder, the second cylinder, the third cylinder and the fourth cylinder are arranged in sequence along the intake direction in the engine, and the end of the intake manifold close to the inlet section is aligned with the position of the first cylinder.
[0010] Furthermore, the cross section of the inlet end is an inclined structure, and the inlet end is inclined toward the inlet section along a direction close to the engine cylinder head.
[0011] Furthermore, the first cylinder, the second cylinder, the third cylinder and the fourth cylinder are respectively provided with two intake ducts, and the intake ducts are conductively connected to the intake manifold.
[0012] Furthermore, a flange is provided on a side of the intake manifold away from the intake manifold, and the flange is connected to the engine cylinder head by bolts.
[0013] The beneficial effects of the utility model are:
[0014] Since the intake manifold is located on the same side of all intake manifolds, the swirl ratio values of all cylinders can be made close through the end-face intake method, that is, there is better swirl ratio uniformity; the rounded corners of the end structure of the intake manifold can reduce weight, improve flow, and reduce flow dead zones; the ratio of the long side h of the inner cavity of the intake manifold to the width D of the intake manifold is greater than or equal to 2.7, which is conducive to the full development of the airflow in the horizontal direction within the width of the manifold and smooth flow into the intake duct; the neck angle α≥150° can make the airflow flow smoothly in the intake manifold, reduce flow resistance, and at the same time not affect the flow direction of the airflow of each cylinder too much, ensuring the uniformity of the intake flow coefficient and swirl ratio of each cylinder; the structures of the intake manifold and the inlet section of the utility model cooperate with each other, which can shorten the length of the intake manifold and shorten the width of the intake manifold, so that the intake system has a simple structure, can reduce the weight and volume of the intake system, do not require the intake manifold to be unbent, have better manufacturability, do not affect the flow performance, and are more beautiful. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of an engine air intake device according to a preferred embodiment of the present invention.
[0016] Figure 2 It is a schematic structural diagram of an intake manifold of an engine intake device according to a preferred embodiment of the present invention.
[0017] Figure 3 It is a cross-sectional view of an intake manifold of an engine intake device according to a preferred embodiment of the present invention.
[0018] Figure 4It is a schematic diagram of the cylinder structure of an engine air intake device according to a preferred embodiment of the present invention.
[0019] Figure 5 It is a schematic diagram of the flange structure of an engine air intake device in a preferred embodiment of the present invention.
[0020] Figure 6 It is a schematic diagram of the flange structure of an engine air intake device in a preferred embodiment of the present invention.
[0021] In the figure, 1-intake pipe, 11-intake manifold, 111-rounded corner, 112-inlet end, 12-intake manifold, 13-inlet section, 2-engine cylinder head, 21-engine, 211-first cylinder, 212-second cylinder, 213-third cylinder, 214-fourth cylinder, 215-intake duct, 3-rounded corner, 4-flange, 41-bolt. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0023] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a central component. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.
[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0025] Please also see Figures 1 to 6 An engine air intake device according to a preferred embodiment of the present invention includes an air intake pipe 1 and an engine cylinder head 2 .
[0026] The intake pipe 1 includes an intake manifold 11, and a plurality of intake manifolds 12 are connected to the bottom of the intake manifold 11. The end of the intake manifold 12 away from the intake manifold 11 is conductively connected to the engine cylinder head 2. The end of the intake manifold 11 away from the engine cylinder head 2 is provided with a rounded corner 111. The end of the intake manifold 11 away from the rounded corner 111 is an inlet end 112, and the inlet end 112 is provided with an inlet section 13.
[0027] An intake pipe 3 is provided at the end of the inlet section 13 away from the intake manifold 11, and the end of the inlet section 13 away from the intake manifold 11 is inclined toward the direction away from the engine cylinder head 2, so that the side of the intake manifold 11 away from the engine cylinder head 2 and the side of the inlet section 13 away from the engine cylinder head 2 form a neck angle α greater than 150°.
[0028] A neck angle α ≥ 150° ensures smooth airflow in the intake manifold 11, reducing flow resistance while not significantly affecting the flow direction of the airflow within each cylinder, ensuring uniformity in the intake flow coefficient and swirl ratio across the cylinders. Preferably, in this embodiment, the intake manifold length is ≥ 15 mm, thereby providing airflow straightening while ensuring the thickness of the outlet flange of the intake manifold 11 to prevent air leakage.
[0029] like Figure 2 and Figure 3 As mentioned above, the cross section of the inner cavity of the intake manifold 11 is an elliptical structure, and the intake manifold 12 is arranged on the short side of the intake manifold 11. Figure 3 As shown, the short side length of the intake manifold 11 is d.
[0030] The ratio of the inner length h of the intake manifold 11 to the width D of the intake manifold 12 is greater than or equal to 2.7, that is, h / D=2.7; and the radius R of the fillet 111 and the inner length h of the intake manifold 11 satisfy 2 / 3h≤R≤h.
[0031] The rounded corners 111 at the end of the intake manifold 11 reduce weight, improve flow, and reduce dead zones. The elliptical shape of the intake manifold 11 ensures the required minimum intake volume and enhances intake responsiveness. The ratio of the long side of the intake manifold 11 to the width of the intake manifold 12 ensures sufficient space along the length of the intake manifold 12 for airflow to fully develop and flow smoothly into each intake manifold 12. The short side of the intake manifold 11 can be adjusted as needed to meet the minimum intake volume, ensuring sufficient intake volume and intake responsiveness.
[0032] like Figure 4As shown, the engine cylinder head 2 is mounted on the engine 21, and a first cylinder 211, a second cylinder 212, a third cylinder 213, and a fourth cylinder 214 are sequentially arranged in the engine 21 along the intake direction. The position of the inlet section 13 is aligned with the position of the first cylinder 211. The cross section of the inlet end 112 is an inclined structure, and the inlet end 112 is inclined toward the inlet section 13 along the direction close to the engine cylinder head 2.
[0033] Since the intake manifold 11 is located on the same side of all the intake manifolds 12, the inlet port of the intake manifold 11 is located on one side of all the intake manifolds 12. The inclined structure of the inlet end 112 can be aligned with the first cylinder 211, and the remaining cylinders are all located behind the inlet end 112, realizing an end-face intake method, so that the swirl ratio values of all cylinders are close, that is, there is good swirl ratio uniformity.
[0034] like Figure 4 As shown, the first cylinder 211 , the second cylinder 212 , the third cylinder 213 and the fourth cylinder 214 are respectively provided with two intake passages 215 , and the intake passages 215 are conductively connected to the intake manifold 12 .
[0035] In this embodiment, each cylinder has two independent intake ducts and inlets, and the intake manifold 12 and the intake duct are in a one-to-one correspondence, thereby reducing the degree of mutual interference when the two intake ducts 215 take in air at the same time. At the same time, the system adaptability of this embodiment is good, and different swirl ratios and tumble ratio requirements can be obtained by adjusting the structure of the two intake ducts 215.
[0036] If a strong swirl ratio and weak tumble flow are required, both air inlets 215 are spiral air inlets; if a medium-intensity swirl ratio is required, one air inlet 215 is a tangential air inlet and the other air inlet 215 is a spiral air inlet; if a weak swirl ratio and strong tumble flow are required, both air inlets 215 are tangential air inlets.
[0037] like Figure 5 and Figure 6 As shown, a flange 4 is provided on a side of the intake manifold 12 away from the intake manifold 11 , and the flange 4 is connected to the engine cylinder head 2 via bolts 41 .
[0038] In this embodiment, flange 4 has ten bolt holes. These ten bolt holes have two configurations. One is an elliptical bolt hole, located at the end closest to the intake manifold 2. Its diameter is approximately 2-3 mm larger than the diameter of bolt 41, and there is only one such bolt hole. The remaining nine bolt holes are circular bolt holes, each only 1 mm larger than the diameter of bolt 41. This embodiment ensures accurate installation and positioning of the intake manifold 3 and the engine cylinder head 2, while also allowing for relatively large deviations in actual assembly due to accumulated bolt hole tolerances. The elliptical bolt holes provide for adjustment.
[0039] Preferably, the inlet section 13 is a trumpet-shaped structure, and the wide end of the inlet section 13 is conductively connected to the inlet section 13, and the cone angle β of the inlet section 13 is 20°≤β≤60°; the angle δ between the center line of the inlet end of the inlet section 13 and the opening direction of the intake manifold 12 is 90°.
[0040] The height H between the centerline position of the inlet of the inlet section 13 and the intake manifold 12 satisfies H≥L+1 / 2h, where L is the length of the intake manifold 12 and h is the long side of the inner cavity of the intake manifold 11.
[0041] This embodiment can shorten the length of the intake manifold 12 and the width of the intake manifold 11. The rounded corners of the intake manifold 11 can effectively reduce the weight of the intake system. The intake manifold structure is simpler, has no bends, and is more manufacturable without affecting the flow performance and is more beautiful.
Claims
1. An engine air intake device, characterized in that: The invention comprises an intake pipe (1) and an engine cylinder head (2), wherein the intake pipe (1) comprises an intake manifold (11), a plurality of intake manifolds (12) are connected to the bottom of the intake manifold (11), one end of the intake manifold (12) away from the intake manifold (11) is connected to the engine cylinder head (2), and one end of the intake manifold (11) away from the engine cylinder head (2) is provided with a rounded corner (111), and the end of the intake manifold (11) away from the rounded corner (111) is an intake manifold. An inlet end (112) is provided with an inlet section (13), an end of the inlet section (13) away from the intake manifold (11) is provided with an intake connecting pipe (3), and the end of the inlet section (13) away from the intake manifold (11) is inclined in a direction away from the engine cylinder head (2), so that a side of the intake manifold (11) away from the engine cylinder head (2) and a side of the inlet section (13) away from the engine cylinder head (2) form a neck angle α greater than 150 degrees.
2. The engine air intake device according to claim 1, characterized in that: The cross section of the inner cavity of the intake manifold (11) is an elliptical structure, and the intake manifold (12) is arranged on the short side of the intake manifold (11).
3. The engine air intake device according to claim 2, characterized in that: The ratio of the inner cavity length h of the intake manifold (11) to the width D of the intake manifold (12) is greater than or equal to 2.7; and the radius R of the fillet (111) and the inner cavity length h of the intake manifold (11) satisfy 2 / 3h≤R≤h.
4. The engine air intake device according to claim 1, characterized in that: The engine cylinder head (2) is arranged on the engine (21), and a first cylinder (211), a second cylinder (212), a third cylinder (213), and a fourth cylinder (214) are sequentially arranged in the engine (21) along the air intake direction, and an end of the air intake manifold (11) close to the inlet section (13) is aligned with the position of the first cylinder (211).
5. The engine air intake device according to claim 4, characterized in that: The cross section of the inlet end (112) is an inclined structure, and the inlet end (112) is inclined toward the inlet section (13) along a direction close to the engine cylinder head (2).
6. The engine air intake device according to claim 4, characterized in that: The first cylinder (211), the second cylinder (212), the third cylinder (213) and the fourth cylinder (214) are each provided with two intake passages (215), and the intake passages (215) are conductively connected to the intake manifold (12).
7. The engine air intake device according to claim 1, characterized in that: A flange (4) is provided on a side of the intake manifold (12) away from the intake manifold (11), and the flange (4) is connected to the engine cylinder head (2) via bolts (41).