A large displacement engine intake manifold assembly

Abstract

A large displacement engine intake manifold assembly belongs to the technical field of automobile engine intake system. Four air inlets are arranged around the outside of the stable pressure cavity in the shape of a volute, the air inlet is fixed in communication with the stable pressure cavity, the air inlet is arranged between the third air inlet and the fourth air inlet, the air inlet end of the four air inlets is in fixed communication with the stable pressure cavity, the air outlet end of the four air inlets is in fixed communication with the outlet flange, the PCV channel inlet is integrated at the outlet flange, and the PCV channel inlet is in communication with the internal airflow channel of the outlet flange, the EGR mounting boss is arranged on the side wall of the stable pressure cavity, and the internal channel of the EGR mounting boss is in communication with the inner cavity of the stable pressure cavity. The utility model discloses through structure optimization, on the basis of meeting the national six emission requirements, effectively improve the NVH performance, improve the intake and combustion performance, and the structure is compact, the integration is good, has good practical value.

Description

Technical Field

[0001] This utility model belongs to the technical field of automotive engine intake system, specifically a large-displacement engine intake manifold assembly. Background Technology

[0002] As a crucial component of the intake system, the intake manifold's structure, shape, and port dimensions significantly impact engine performance, including charging efficiency, intake resistance, and intake uniformity across cylinders. This, in turn, affects engine power, fuel economy, emissions, and NVH (noise, vibration, and harshness) performance. The intake manifold provides an EGR (exhaust gas recirculation) interface, reducing NOx emissions, diluting combustion, and lowering fuel consumption through exhaust gas recirculation. However, space constraints, coupled with the need to maintain optimal intake performance, significantly increase the design complexity. Summary of the Invention

[0003] To address the problems existing in the background art, this utility model provides an intake manifold assembly for a large displacement engine.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a large displacement engine intake manifold assembly, including an intake port, a pressure regulating chamber, an outlet flange, a PCV channel inlet, an EGR mounting boss, and four intake passages;

[0005] The four air intakes are arranged in a volute shape around the outside of the pressure stabilizing chamber. The air inlet is connected and fixed to the pressure stabilizing chamber. The air inlet is arranged between the third and fourth air intakes. The air intake ends of the four air intakes are all connected and fixed to the pressure stabilizing chamber. The air outlet ends of the four air intakes are all connected and fixed to the outlet flange. The PCV channel inlet is integrated at the outlet flange, and the PCV channel inlet is connected to the internal airflow channel of the outlet flange. The EGR mounting boss is set on the side wall of the pressure stabilizing chamber, and the internal channel of the EGR mounting boss is connected to the inner cavity of the pressure stabilizing chamber.

[0006] The surfaces of the four air intakes and the pressure stabilizing chamber are thickened in local areas to form locally thickened sections. The outer surfaces of the four air intakes and the pressure stabilizing chamber are provided with reinforcing ribs, which are arranged along the length of the air intakes and the circumference of the pressure stabilizing chambers.

[0007] The end of the EGR mounting boss is provided with a sealing mating surface, and the outlet end of the EGR valve connection pipeline is sealed and connected to the internal channel of the EGR mounting boss through this sealing mating surface.

[0008] Compared with the prior art, the beneficial effects of this utility model are:

[0009] 1. Meets emission requirements: By setting an EGR mounting boss on the side of the pressure stabilizing chamber, the exhaust gas can be fully dispersed under the impact of the intake airflow after entering the pressure stabilizing chamber through the EGR valve connecting pipeline. It is then evenly distributed to each cylinder to participate in combustion, effectively reducing NOx emissions and meeting the requirements of the China VI emission regulations.

[0010] 2. Improved NVH performance: The wall thickness of local areas of the four air intakes and pressure regulating chambers is increased. At the same time, reinforcing ribs are set on the outer surface of the four air intakes and pressure regulating chambers along the length of the air intakes and the circumference of the pressure regulating chambers, which improves the surface stiffness of the manifold and reduces surface vibration and radiated noise. In addition, the volute design of the air intakes reduces airflow turbulence and further optimizes NVH performance.

[0011] 3. Improved intake and combustion performance: The intake manifold is volute-shaped and surrounds the pressure stabilizing chamber, which not only ensures a smooth intake path, reduces intake resistance, and improves charging efficiency, but also adapts to the available space; the air can be fully mixed with natural gas at the end of the manifold before entering the cylinder, improving combustion efficiency and thus enhancing engine power and economy.

[0012] 4. Compact structure and good integration: The PCV channel is integrated at the outlet flange, which simplifies the pipeline layout and reduces space occupation; the layout of each structure is reasonable, which meets the functional requirements while taking into account the installation space constraints, thus improving the overall practicality.

[0013] In summary, this utility model, through structural optimization, effectively improves NVH performance and enhances intake and combustion performance while meeting the China VI emission requirements. Furthermore, it features a compact structure, good integration, and significant practical value. Attached Figure Description

[0014] Figure 1 This is a front view of the present invention;

[0015] Figure 2 This is the right view of the present invention;

[0016] Figure 3 This is a cross-sectional view of the flange with built-in PCV channel of this utility model;

[0017] Figure 4 This is a schematic diagram of the arrangement of the thickened section and reinforcing ribs of this utility model;

[0018] Figure 5 yes Figure 4 A schematic diagram of the optimized parameters. Detailed Implementation

[0019] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0020] This embodiment describes an intake manifold assembly for a large displacement engine, including an intake port 1, a pressure regulating chamber 2, an outlet flange 4, a PCV channel inlet 5, an EGR mounting boss 6, and four intake passages 3.

[0021] The four air intakes 3 are arranged in a volute shape around the outside of the pressure stabilizing chamber 2. The air inlet 1 is connected and fixed to the pressure stabilizing chamber 2. The air inlet 1 is arranged between the third air intake 303 and the fourth air intake 304. The air intake ends of the four air intakes 3 are all connected and fixed to the pressure stabilizing chamber 2. The air outlet ends of the four air intakes 3 are all connected and fixed to the outlet flange 4. The PCV channel inlet 5 is integrated into the outlet flange 4, and the PCV channel inlet 5 is connected to the internal airflow channel of the outlet flange 4. The EGR mounting boss 6 is set on the side wall of the pressure stabilizing chamber 2, and the internal channel of the EGR mounting boss 6 is connected to the inner cavity of the pressure stabilizing chamber 2.

[0022] The surfaces of the four air intakes 3 and the pressure stabilizing chamber 2 are thickened in local areas to form locally thickened sections. The outer surfaces of the four air intakes 3 and the pressure stabilizing chamber 2 are provided with reinforcing ribs, which are arranged along the length of the air intakes 3 and the circumference of the pressure stabilizing chamber 2.

[0023] The end of the EGR mounting boss 6 is provided with a sealing mating surface, and the outlet end of the EGR valve connection pipeline is sealed and connected to the internal channel of the EGR mounting boss 6 through this sealing mating surface.

[0024] In actual operation, the intake manifold assembly of this utility model for a large-displacement engine works in concert with its components to achieve a comprehensive effect of intake, exhaust gas recirculation, and performance optimization. Outside air first enters the pressure-stabilizing chamber 2 through the intake port 1. The pressure-stabilizing chamber 2 stabilizes the airflow through volumetric buffering, reducing pulsation and preparing for uniform air intake to each cylinder. Subsequently, the stabilized air flows into four volute-shaped intake ducts 3 surrounding the outside of the pressure-stabilizing chamber 2 (e.g., ...). Figure 1As shown, the four intake ducts 3, from left to right, are the first intake duct, the second intake duct, the third intake duct 303, and the fourth intake duct 304. The volute-shaped design guides the airflow along a smooth path, reducing intake resistance. It also adapts to the available space, ensuring reasonable intake parameters to improve charging efficiency. After the air is fully mixed with the fuel at the ends of the four intake ducts 3, it enters the cylinder for combustion through the outlet flange 4 (used to connect the intake duct outlet to the cylinder intake port). Regarding EGR exhaust gas recirculation, the EGR valve connection pipe is sealed via the sealing mating surface at the end of the EGR mounting boss 6 to prevent exhaust gas leakage. Part of the exhaust gas enters the internal channel of the EGR mounting boss 6 through the EGR valve and connecting pipeline, and then flows into the pressure stabilizing chamber 2. Under the impact of the intake airflow, it is evenly mixed with fresh air, and then distributed to each cylinder through the four intake ducts 3, realizing exhaust gas recirculation to reduce NOx emissions and meet the China VI emission standards. The PCV channel inlet 5 integrated at the outlet flange 4 is connected to the internal airflow channel of the flange. The oil-air mixture in the crankcase can enter the intake system through this inlet and enter the cylinder for combustion with the intake air, realizing oil-air recovery. In addition, the local thickening sections on the surfaces of the four intake ducts 3 and the pressure stabilizing chamber 2 improve the structural rigidity, and the reinforcing ribs on the outer surface (such as...) Figure 4 (As shown) Further enhances stability, reduces vibration and surface radiation noise, and the volute-shaped air passage and pressure stabilizing cavity design also reduce airflow noise, comprehensively improving NVH performance.

[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A large-displacement engine intake manifold assembly, characterized in that: It includes an air inlet (1), a pressure regulating chamber (2), an outlet flange (4), a PCV channel inlet (5), an EGR mounting boss (6), and four air inlets (3); The four air intakes (3) are arranged in a volute shape around the outside of the pressure stabilizing chamber (2). The air inlet (1) is connected and fixed to the pressure stabilizing chamber (2). The air inlet (1) is arranged between the third air intake (303) and the fourth air intake (304). The air intake ends of the four air intakes (3) are all connected and fixed to the pressure stabilizing chamber (2). The air outlet ends of the four air intakes (3) are all connected and fixed to the outlet flange (4). The PCV channel inlet (5) is integrated at the outlet flange (4), and the PCV channel inlet (5) is connected to the internal airflow channel of the outlet flange (4). The EGR mounting boss (6) is set on the side wall of the pressure stabilizing chamber (2). The internal channel of the EGR mounting boss (6) is connected to the inner cavity of the pressure stabilizing chamber (2).

2. The intake manifold assembly for a large-displacement engine according to claim 1, characterized in that: The surfaces of the four air intakes (3) and the pressure stabilizing chamber (2) are thickened in local areas to form locally thickened sections. The outer surfaces of the four air intakes (3) and the pressure stabilizing chamber (2) are provided with reinforcing ribs, which are arranged along the length of the air intakes (3) and the circumference of the pressure stabilizing chamber (2).

3. The intake manifold assembly for a large displacement engine according to claim 1, characterized in that: The end of the EGR mounting boss (6) is provided with a sealing mating surface, and the outlet end of the EGR valve connecting pipe is sealed and connected to the internal channel of the EGR mounting boss (6) through the sealing mating surface.

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