EGR gas mixing structure of V-type two-cylinder engine

Abstract

The utility model relates to a kind of EGR gas mixing structure of V-type two-cylinder engine.The utility model includes the cylinder body of two cylinders being arranged V-type, cylinder body is respectively provided with cylinder cover corresponding each cylinder, cylinder cover is provided with cylinder cover air inlet and cylinder cover exhaust port;One intake manifold, the two branch pipes of intake manifold are respectively connected with the air inlet of each cylinder;One exhaust manifold, the two branch pipes of exhaust manifold are respectively connected with the exhaust port of each cylinder;Intake pressure stabilizing chamber, two branch pipes of intake manifold are connected respectively;Water pump and EGR cooler, EGR cooler is provided with EGR cooler air inlet, EGR cooler outlet, EGR cooler water inlet, EGR cooler water outlet;EGR cooler air inlet of EGR cooler is connected with the branch pipe of exhaust manifold, EGR cooler outlet of EGR cooler is connected to intake pressure stabilizing chamber by EGR valve.The utility model can meet the compactness design of V-type two-cylinder engine and the mounting requirement of small car.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and in particular to an EGR gas mixing structure for a V-type two-cylinder engine. Background Technology

[0002] The key factors in developing low-power range extenders are economy and size. Only when the cost is controlled within a certain range will it be accepted by the market. Conventional V-two engines generally have high fuel consumption, making them unsuitable for use as range extenders in small vehicles. The size of the engine determines whether a low-power range extender can be matched with the compact engine bay of a small vehicle.

[0003] The main function of the EGR (Exhaust Gas Recirculation) system in an engine is to control nitrogen oxide emissions, improve thermal efficiency, suppress knocking, and optimize combustion. Its principle is to reintroduce some exhaust gas into the intake manifold, mix it with fresh air, and then enter the combustion chamber. The EGR system lowers the combustion temperature by recirculating exhaust gas, making it a core technology for controlling nitrogen oxide emissions, while simultaneously optimizing fuel efficiency and combustion stability.

[0004] However, for V-type two-cylinder engines, due to their large lateral space requirements and their typical application in small vehicles, the engine's height and width are significantly limited, leading to increased difficulty in overall layout and thus greatly restricting the integration of the EGR system. Summary of the Invention

[0005] Therefore, this utility model provides an EGR gas mixing structure for a V-type two-cylinder engine, which can meet the compact design of V-type two-cylinder engines and the installation requirements of small cars.

[0006] To solve the above-mentioned technical problems, this utility model provides an EGR gas mixing structure for a V-type two-cylinder engine, comprising:

[0007] A cylinder body with two cylinders arranged in a V-shape, wherein a cylinder head is provided on the cylinder body corresponding to each of the cylinders, and a cylinder head air inlet and a cylinder head exhaust outlet are provided on the cylinder head;

[0008] An intake manifold, wherein two branches of the intake manifold are respectively connected to the intake ports of each of the cylinders;

[0009] An exhaust manifold, wherein two branches of the exhaust manifold are respectively connected to the exhaust ports of each of the cylinders;

[0010] The intake pressure regulating chamber is connected to two branch pipes of the intake manifold;

[0011] Water pumps are used to supply cooling water;

[0012] The EGR cooler is provided with an EGR cooler air inlet, an EGR cooler air outlet, an EGR cooler water inlet, and an EGR cooler water outlet.

[0013] The EGR cooler's inlet is connected to one of the branch pipes of the exhaust manifold, and the EGR cooler's outlet is connected to the intake pressure regulating chamber via an EGR valve. Cooling water supplied by the water pump enters the EGR cooler through its inlet and cools the exhaust gas before flowing back to the water tank from its outlet.

[0014] In one embodiment of this utility model, the EGR cooler is fixedly installed on the outer shell of the intake pressure regulating chamber.

[0015] In one embodiment of this utility model, the water pump is fixedly installed on the cylinder body.

[0016] In one embodiment of this utility model, a vent pipe is connected between the EGR valve and the intake pressure regulating chamber.

[0017] In one embodiment of this utility model, a water pipe is connected between the water pump and the EGR cooler inlet of the EGR cooler.

[0018] In one embodiment of this utility model, the cylinder head air inlet and the cylinder head exhaust outlet are respectively located at opposite ends of the cylinder head along the cylinder body axial direction.

[0019] In one embodiment of this utility model, the intake manifold and the intake pressure regulating chamber are arranged on one axial side of the middle part of the cylinder block, and the exhaust manifold is arranged on the other axial side of the middle part of the cylinder block.

[0020] In one embodiment of this utility model, the intake pressure regulating chamber is arranged on the upper side of the middle part of the cylinder block, and the EGR valve is arranged on the upper side of the intake pressure regulating chamber.

[0021] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0022] The EGR gas mixing structure of the V-type two-cylinder engine described in this utility model can arrange key engine systems such as the EGR system, intake and exhaust system and cooling system in the relatively small space of the V-type two-cylinder engine. It meets the requirements of low fuel consumption of the engine while making the overall layout compact, so as to be adapted to various small car products, reduce the fuel consumption of the V-type two-cylinder engine, and at the same time meet the requirements of engine compact design and small car installation. Attached Figure Description

[0023] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0024] Figure 1 This is a front view schematic diagram of the EGR gas mixing structure of the V-type two-cylinder engine of this utility model.

[0025] Figure 2 This is a rear view schematic diagram of the EGR gas mixing structure of the V-type two-cylinder engine of this utility model.

[0026] Figure 3 This is a schematic diagram of the structure of the EGR cooler of this utility model.

[0027] Figure 4 This is a schematic diagram of the water and air circuits of this utility model.

[0028] Explanation of reference numerals in the instruction manual:

[0029] 100. Cylinder block;

[0030] 200. Cylinder head; 210. Cylinder head intake port; 220. Cylinder head exhaust port;

[0031] 300. Intake manifold;

[0032] 400. Exhaust manifold;

[0033] 500. Intake pressure regulating chamber;

[0034] 600. Water pump; 610. Water pipe;

[0035] 700, EGR cooler; 710, EGR cooler air inlet; 720, EGR cooler air outlet; 730, EGR cooler water inlet; 740, EGR cooler water outlet;

[0036] 800, EGR valve; 810, vent pipe. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0038] In this utility model, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this utility model, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0039] In this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number; "above," "below," "within," etc. are understood to include the stated number. In the description of this utility model, if "first" or "second" is used, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0040] In this utility model, unless otherwise explicitly defined, terms such as "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model based on the specific content of the technical solution.

[0041] Reference Figure 1 , Figure 2 As shown, the present invention discloses an EGR gas mixing structure for a V-type two-cylinder engine, comprising:

[0042] A cylinder body 100 with two cylinders arranged in a V-shape, and a cylinder head 200 is provided on the cylinder body 100 corresponding to each of the cylinders. The cylinder head 200 is provided with a cylinder head air inlet 210 and a cylinder head exhaust port 220.

[0043] An intake manifold 300 and two branch pipes are respectively connected to the cylinder head intake port 210 of each cylinder head;

[0044] An exhaust manifold 400 and two branch pipes, one end of which are respectively connected to the cylinder head exhaust port 220 of each cylinder head;

[0045] The intake pressure regulating chamber 500 is connected to one end of each of the two branch pipes of the intake manifold 300;

[0046] Water pump 600 is used to supply cooling water;

[0047] EGR cooler 700, wherein the EGR cooler 700 is provided with an EGR cooler cylinder head air inlet 210, an EGR cooler air outlet 720, an EGR cooler water inlet 730, and an EGR cooler water outlet 740.

[0048] Reference Figure 4As shown, the EGR cooler inlet 710 of the EGR cooler 700 is connected to one of the branch pipes of the exhaust manifold 400, and the EGR cooler outlet 720 of the EGR cooler 700 is connected to the intake pressure regulating chamber 500 through the EGR valve 800. The cooling water provided by the water pump 600 enters the EGR cooler 700 through the EGR cooler inlet 730 and cools the exhaust gas, and then flows back to the water tank from the EGR cooler outlet 740 of the EGR cooler 700.

[0049] By integrating the EGR gas mixing structure into the two-cylinder block 100, the EGR system, intake and exhaust system and cooling system are rationally integrated in a limited space, which significantly improves space utilization efficiency, meets the stringent requirements of small car engine compartment for size and structure, and provides strong support for the compact design of V-type two-cylinder engines.

[0050] In one embodiment, the EGR cooler 700 is fixedly mounted on the outer casing of the intake pressure regulating chamber 500, and can be secured with bolts. This modular assembly enables improved system structural stability and overall rigidity, helps reduce vibration impact, enhances system durability and reliability, and facilitates manufacturing and subsequent maintenance.

[0051] In one embodiment, the water pump 600 is fixedly mounted on the cylinder 100. This effectively shortens the cooling water circulation path, reduces energy loss, and improves cooling efficiency.

[0052] In one embodiment, a vent pipe 810, such as a rubber hose, is connected between the EGR valve 800 and the intake pressure regulating chamber 500.

[0053] In one embodiment, a water pipe 610 is connected between the water pump 600 and the EGR cooler inlet 730 of the EGR cooler 700.

[0054] In one embodiment, the cylinder head air inlet 210 and the cylinder head exhaust outlet 220 are respectively located at opposite ends of the cylinder head 200 along the axial direction of the cylinder block 100.

[0055] In one embodiment, the intake manifold 300 and the intake pressure regulating chamber 500 are arranged on one axial side of the middle of the cylinder block 100 (near the front end), and the exhaust manifold 400 is arranged on the other axial side of the middle of the cylinder block 100 (near the rear end). This side-by-side arrangement helps optimize the spatial separation between the systems, prevents thermal interference, improves the working efficiency of the intake and exhaust systems, and further enhances the rationality and compactness of the overall machine layout.

[0056] In one embodiment, the intake pressure regulating chamber 500 is arranged on the upper side of the middle part of the cylinder block 100, and the EGR valve 800 is arranged on the upper side of the intake pressure regulating chamber 500 (at the highest point). A hose pointing downwards is connected to the intake pressure regulating chamber 500, which can return the condensate to the intake manifold 300 and burn it in the combustion chamber.

[0057] Understandably, referring to Figure 3 As shown, the EGR cooler 700 includes an EGR cooler inlet 710, an EGR cooler outlet 720, an EGR cooler water inlet 730, and an EGR cooler water outlet 740. The cooling water flow path X is as follows: cooling water flows in from the EGR cooler water inlet 730, cools the high-temperature exhaust gas in the exhaust gas flow path Y, and then flows out from the EGR cooler water outlet 740.

[0058] When working, refer to Figure 3 As shown, residual exhaust gas is discharged from cylinder head 200 and enters exhaust manifold 400, from where it directly enters EGR cooler 700. After being cooled, the exhaust gas flows through EGR valve 800 and then returns directly to intake pressure regulating chamber 500 through hose, thus realizing the function of the EGR system. Cooling water starts from water pump 600 and enters the water jacket in EGR cooler 700, then flows back to water tank through water pipe 610. At the same time, the water in cylinder head 200 also flows back to water tank.

[0059] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An EGR gas mixing structure for a V-type two-cylinder engine, characterized in that, include: A cylinder body (100) with two cylinders arranged in a V-shape, and a cylinder head (200) is provided on the cylinder body (100) corresponding to each of the cylinders. The cylinder head (200) is provided with a cylinder head air inlet (210) and a cylinder head exhaust port (220). An intake manifold (300) has two branches that are respectively connected to the cylinder head intake port (210) of each cylinder. An exhaust manifold (400) has two branches that are respectively connected to the cylinder head exhaust port (220) of each of the cylinders. The intake pressure regulating chamber (500) is connected to two branch pipes of the intake manifold (300); Water pump (600) is used to supply cooling water; EGR cooler (700), the EGR cooler (700) is provided with EGR cooler air inlet (710), EGR cooler air outlet (720), EGR cooler water inlet (730) and EGR cooler water outlet (740). The EGR cooler inlet (710) of the EGR cooler (700) is connected to one of the branch pipes of the exhaust manifold (400), and the EGR cooler outlet (720) of the EGR cooler (700) is connected to the intake pressure regulating chamber (500) through the EGR valve (800). The cooling water provided by the water pump (600) enters the EGR cooler (700) through the EGR cooler inlet (730) and cools the exhaust gas before flowing back to the water tank from the EGR cooler outlet (740).

2. The EGR gas mixing structure of a V-type two-cylinder engine according to claim 1, characterized in that, The EGR cooler (700) is fixedly mounted on the housing of the intake pressure regulating chamber (500).

3. The EGR gas mixing structure of a V-type two-cylinder engine according to claim 1, characterized in that, The water pump (600) is fixedly installed on the cylinder (100).

4. The EGR gas mixing structure of a V-type two-cylinder engine according to claim 1, characterized in that, A vent pipe (810) is connected between the EGR valve (800) and the intake pressure regulating chamber (500).

5. The EGR gas mixing structure of a V-type two-cylinder engine according to claim 1, characterized in that, A water pipe (610) is connected between the water pump (600) and the EGR cooler inlet (730) of the EGR cooler (700).

6. The EGR gas mixing structure of a V-type two-cylinder engine according to claim 1, characterized in that, The cylinder head air inlet (210) and the cylinder head exhaust port (220) are respectively located at opposite ends of the cylinder head (200) along the axial direction of the cylinder block (100).

7. The EGR gas mixing structure of a V-type two-cylinder engine according to claim 1, characterized in that, The intake manifold (300) and the intake pressure regulating chamber (500) are arranged on one side of the central axial direction of the cylinder block (100), and the exhaust manifold (400) is arranged on the other side of the central axial direction of the cylinder block (100).

8. The EGR gas mixing structure of a V-type two-cylinder engine according to claim 1, characterized in that, The intake pressure regulating chamber (500) is arranged on the upper side of the middle part of the cylinder block (100), and the EGR valve (800) is arranged on the upper side of the intake pressure regulating chamber (500).

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