V-shaped two-cylinder engine and EGR cooler integrated structure

Abstract

The invention relates to a V-shaped two-cylinder engine and EGR cooler integrated structure. The air cylinder cooling device comprises a cylinder body of two air cylinders arranged in a V shape, a cylinder body cooling water cavity is formed in the middle of a V-shaped structure formed by the two air cylinders on the cylinder body, and the cylinder body is provided with a cylinder body EGR air inlet and a cylinder body EGR air outlet; the water channel cover covers an opening in the upper end of the cylinder body cooling water cavity, the water channel cover is provided with a water channel cover cooling water cavity and a water channel cover water inlet, and the cylinder body cooling water cavity is communicated with the water channel cover cooling water cavity to form an integrated cooling water channel; and the EGR cooler is arranged in the integrated cooling water channel, the EGR cooler comprises an EGR cooler waste gas channel, the inlet end of the EGR cooler waste gas channel communicates with the cylinder body EGR gas inlet, and the outlet end of the EGR cooler waste gas channel communicates with the cylinder body EGR gas outlet. According to the V-shaped two-cylinder engine, the heat efficiency of the engine is improved, and the overall size of the V-shaped two-cylinder engine can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, in particular to an integrated structure of a V-type two-cylinder engine and an EGR cooler. Background Art

[0002] To achieve energy conservation and emission reduction, leading OEMs both domestically and internationally are continuously upgrading fuel-saving technologies. EGR (Exhaust Gas Recirculation) cooler systems play a crucial role in high-efficiency gasoline engines. Data from renowned international automotive parts developers indicates that, depending on the engine, using a cooled EGR system can improve efficiency by 5% to 8% or even more.

[0003] The fuel-saving principle of EGR is as follows: Low speed and high load: When the speed is low, the flame combustion speed is slow, and at the same time, the load is high, and the knock tendency increases. At this time, EGR is used to reduce the combustion temperature, thereby appropriately increasing the ignition advance angle, which is beneficial to reducing fuel consumption; Low speed and low load: EGR can be used to reduce pumping losses; Medium speed and medium load: After the exhaust gas is introduced by EGR, the specific heat capacity ratio is increased. At the same time, the exhaust gas is an inert gas, which can effectively reduce the temperature in the cylinder, and thus appropriately increase the compression ratio, which is beneficial to improving the thermal efficiency of the engine and reducing fuel consumption; High speed and high load: Traditional gasoline engines generally use over-injection measures at high speeds to ensure that the exhaust temperature is below the limit. The EGR system can effectively reduce over-injection, thereby reducing fuel consumption.

[0004] As is well known, range-extended powertrains in the new energy vehicle sector are being adopted by many leading automakers due to their low technical barriers and significant fuel-saving benefits. Range-extended products for large vehicles (B+ and above) mostly utilize 1.5L-2.0L naturally aspirated or supercharged high-efficiency engines paired with high-efficiency generators, and have already gained market acceptance. However, there is a market gap for smaller vehicles (A00 and A0 classes) that combine low-power range extenders. Pairing a high-power range extender with a high-power range extender would inevitably result in excessive power and excessive size, making it incompatible. Therefore, low-power range extenders hold significant development potential. Currently, most V-type two-cylinder engines are air-cooled, while existing water-cooled V-type engines generally do not utilize EGR systems due to cost considerations. This results in low thermal efficiency for traditional V-type two-cylinder engines, limiting their application in low-power range extenders. Furthermore, the external EGR cooler structure of traditional EGR systems increases the overall size of the engine, making it difficult to fit into the very compact cabins of small cars. Summary of the Invention

[0005] To this end, the present invention provides an integrated structure of a V-type two-cylinder engine and an EGR cooler. By building the EGR cooler into the top of the cylinder block and integrating it into the cooling water channel, the thermal efficiency of the engine is improved, the overall size of the V-type two-cylinder engine is reduced, and the compactness of the V-type two-cylinder engine is improved. It can be well applied to the engine compartment of small cars with extremely high requirements for compactness.

[0006] To solve the above technical problems, the present invention provides an integrated structure of a V-type two-cylinder engine and an EGR cooler, comprising: A cylinder block with two cylinders arranged in a V-shape, wherein a cylinder cooling water cavity is provided in the middle of the V-shaped structure formed by the two cylinders on the cylinder block, and each cylinder block is provided with a cylinder EGR air inlet and a cylinder EGR air outlet; A water channel cover is provided on the upper end opening of the cylinder cooling water cavity, the water channel cover is provided with a water channel cover cooling water cavity and a water channel cover water inlet, the cylinder cooling water cavity is connected to the water channel cover cooling water cavity to form an integrated cooling water channel; An EGR cooler is built into the integrated cooling water channel, the EGR cooler comprising an EGR cooler exhaust passage, the inlet end of the EGR cooler exhaust passage being in communication with the cylinder EGR air inlet, and the outlet end of the EGR cooler exhaust passage being in communication with the cylinder EGR air outlet; The cooling water enters the integrated cooling water channel from the water channel cover water inlet, cools the high-temperature exhaust gas in the exhaust channel of the EGR cooler, and then enters the water jacket of each cylinder block; The exhaust gas discharged from the exhaust pipe enters the EGR cooler exhaust channel through the cylinder EGR air inlet, and after heat exchange with the cooling water in the integrated cooling water channel, is discharged from the cylinder EGR air outlet and enters the intake manifold to mix with fresh air.

[0007] In one embodiment of the present invention, the cylinder EGR air inlet and the cylinder EGR air outlet are formed by machining or precasting channels.

[0008] In one embodiment of the present invention, the water inlet of the water channel cover is constructed in a curved pipe shape.

[0009] In one embodiment of the present invention, a predetermined gap is left between the inner end surface of the cooling water cavity of the water channel cover and the upper end surface of the EGR cooler.

[0010] In one embodiment of the present invention, the cylinder EGR air inlet and the cylinder EGR air outlet are respectively arranged at an inclination.

[0011] The above technical solution of the present invention has the following advantages over the prior art: The integrated V-type two-cylinder engine and EGR cooler structure described in this invention integrates the EGR cooler into the integrated cooling water channel between the two cylinders of the V-type two-cylinder engine block. This fully utilizes the space between the two cylinders, making the overall engine structure more compact and effectively reducing the engine's overall size. This structure is particularly suitable for small vehicle power systems that require high compactness. The integrated EGR cooling structure achieves efficient heat exchange between exhaust gas and cooling water, significantly reducing exhaust gas temperature and enhancing the cooling effect of the exhaust gas recirculation system, thereby helping to improve the engine's thermal efficiency and fuel economy, and reducing emissions.

[0012] The present invention integrates the cylinder cooling water cavity, the water channel cover cooling water cavity and the EGR cooler into one, reduces the pipe connection points, simplifies the structure, is convenient for manufacturing, assembly and later maintenance, and improves the reliability and integration level of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0014] Figure 1 It is an exploded view of the integrated structure of the V-type two-cylinder engine and the EGR cooler of the present invention.

[0015] Figure 2 It is a schematic diagram of the integrated main structure of the V-type two-cylinder engine and the EGR cooler of the present invention.

[0016] Figure 3 yes Figure 2 Cross-sectional view along AA direction.

[0017] Figure 4 It is a structural diagram of the traditional EGR cooler external solution.

[0018] Figure 5 This is a schematic diagram of the main view of the traditional EGR cooler external solution.

[0019] Figure 6 yes Figure 5 Cross-sectional view along direction BB.

[0020] Description of the accompanying drawings: 1. Cylinder block; 2. Water channel cover; 3. EGR cooler; 1-1. Cylinder block cooling water cavity; 1-2. Cylinder block EGR air inlet; 1-3. Cylinder block EGR air outlet; 2-1. Water channel cover cooling water cavity; 2-2. Water channel cover water inlet; 3-1. EGR cooler exhaust gas passage; X, cooling water flow path; Y, exhaust gas flow path; 3', traditional EGR cooler; 3'-1, traditional EGR cooler air inlet; 3'-2, traditional EGR cooler air outlet; 3'-3, traditional EGR cooler water inlet; 3'-4, traditional EGR cooler water outlet; X', traditional cooling water flow path; Y', traditional exhaust gas flow path. DETAILED DESCRIPTION

[0021] 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 the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0022] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0023] In the present invention, "several" means one or more, "multiple" means more than two, "greater than," "less than," "exceeds," etc. are understood to exclude the number itself; "above," "below," "within," etc. are understood to include the number itself. In the description of the present invention, the use of "first" or "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0024] In the present invention, unless otherwise expressly defined, terms such as "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to direct connection or indirect connection through an intermediate medium; fixed connection or detachable connection or integral molding; mechanical connection or electrical connection or mutual communication; and internal connection between two components or interaction between two components. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0025] Reference Figures 1 to 3 As shown, the present invention provides an integrated structure of a V-type two-cylinder engine and an EGR cooler, comprising: A cylinder block 1 with two cylinders arranged in a V-shape, wherein a cylinder cooling water cavity 1-1 is provided in the middle of the V-shaped structure formed by the two cylinders on the cylinder block 1, and each cylinder block 1 is provided with a cylinder EGR air inlet 1-2 and a cylinder EGR air outlet 1-3; A water channel cover 2 is provided on the upper opening of the cylinder cooling water chamber 1-1. The water channel cover 2 is provided with a water channel cover cooling water chamber 2-1 and a water channel cover water inlet 2-2. The cylinder cooling water chamber 1-1 is connected to the water channel cover cooling water chamber 2-1 to form an integrated cooling water channel. An EGR cooler 3 is built into the integrated cooling water channel. The EGR cooler 3 includes an EGR cooler exhaust gas channel 3-1. The inlet end of the EGR cooler exhaust gas channel 3-1 is connected to the cylinder EGR air inlet 1-2, and the outlet end of the EGR cooler exhaust gas channel 3-1 is connected to the cylinder EGR air outlet 1-3. The cooling water flow path X is as follows: the cooling water enters the integrated cooling water channel from the water channel cover water inlet 2-2, cools the high-temperature exhaust gas in the EGR cooler exhaust gas channel 3-1, and then enters the water jacket of each cylinder block 1; The exhaust gas flow path Y is: the exhaust gas discharged from the exhaust pipe enters the EGR cooler exhaust channel 3-1 through the cylinder EGR air inlet 1-2, and after heat exchange with the cooling water in the integrated cooling water channel, is discharged from the cylinder EGR air outlet 1-3, flows into the intake manifold and mixes with the fresh gas, and then enters the cylinder 1 for efficient combustion.

[0026] In one embodiment, the cylinder EGR air inlet 1 - 2 and the cylinder EGR air outlet 1 - 3 may be designed by machining, precasting channels or other suitable methods to meet different manufacturing and assembly process requirements.

[0027] In one embodiment, the water channel cover water inlet 2-2 is configured as a curved pipe, which is beneficial for optimizing the inflow direction of the cooling water, allowing the cooling water to enter the integrated cooling water channel more smoothly, reducing flow resistance, and improving the uniformity of the cooling water distribution, thereby improving the cooling efficiency of the EGR cooler 3.

[0028] In one embodiment, a predetermined gap is left between the inner end surface of the cooling water chamber 2-1 of the water channel cover and the upper end surface of the EGR cooler 3. This optimizes the cooling water flow path X, allowing the cooling water to fully surround and cool the EGR cooler 3, effectively improving the cooling effect and overall system operational stability.

[0029] In one embodiment, the cylinder EGR inlet 1-2 and the cylinder EGR outlet 1-3 are arranged at an angle, which helps improve the exhaust gas flow path Y, reduce resistance and energy loss during the flow process, and improve the flow efficiency of the exhaust gas through the EGR cooler 3, thereby further enhancing the working effect of the EGR system and the overall performance of the engine.

[0030] During operation, the cylinder cooling water chamber 1-1 of the V-type two-cylinder engine is connected to the water channel cover cooling water chamber 2-1, forming an integrated cooling water channel. The EGR cooler 3 is built into the integrated cooling water channel. Therefore, the cooling water flows through the following path: it enters the integrated cooling water channel through the water channel cover water inlet 2-2, cools the high-temperature exhaust gas therein as it flows through the outside of the EGR cooler 3, and then flows into the two-cylinder water jacket of the cylinder 1, effectively cooling the engine. The exhaust gas flow path Y is: the exhaust gas discharged from the exhaust pipe enters the EGR cooler exhaust gas channel 3-1 through the cylinder EGR air inlet 1-2. The exhaust gas exchanges heat with the coolant in the channel and is then discharged through the cylinder EGR air outlet 1-3. It enters the intake manifold, mixes with the fresh gas, and is then sent into the cylinder 1 to achieve efficient combustion.

[0031] Reference Figures 4 to 6 As shown, taking the traditional external EGR cooler 3' as an example, the traditional EGR cooler 3' includes a traditional EGR cooler air inlet 3'-1, a traditional EGR cooler air outlet 3'-2, a traditional EGR cooler water inlet 3'-3, and a traditional EGR cooler water outlet 3'-4. The traditional cooling water flow path X' is as follows: cooling water flows into the traditional EGR cooler water inlet 3'-3, cools the high-temperature exhaust gas in the traditional exhaust gas flow path Y', and then flows out of the traditional EGR cooler water outlet 3'-4. The traditional EGR cooler 3' is typically installed as a whole between the two cylinders of the cylinder block 1.

[0032] Because the traditional EGR cooler 3' is externally mounted, the entire EGR cooler 3 directly occupies the space between the two cylinders of the engine block 1. This external placement not only hinders the compact integration of the EGR system itself, but also occupies space for other key engine components such as the intake manifold and water pump, restricting the layout of these components and reducing the flexibility of engine structural design. Furthermore, to ensure proper installation and maintenance space for various components, the overall size of the V-type two-cylinder engine is forced to increase, which is not conducive to the requirements of engine miniaturization and integration.

[0033] Therefore, compared with the integrated solution of the present invention in which the EGR cooler 3 is built into the cooling water channel of the cylinder block 1, the traditional external EGR cooler 3 not only increases the volume and complexity of the engine system, but also has shortcomings such as low space utilization and low system integration, which makes it difficult to meet the requirements of small vehicles for the compactness and spatial adaptability of the power system.

[0034] It should be noted that the EGR cooler 3 is preferably located in the integrated water circuit between the two cylinders of the cylinder block 1, fully utilizing the space between the two cylinders and contributing to a more compact engine design. The EGR cooler 3 can also be located in the cooling water circuit at other locations within the cylinder block 1 to accommodate the needs of different engine layouts. The structure of the present invention is applicable not only to V-type two-cylinder engines, but also to other types of engines. Since V-type two-cylinder engines are more sensitive to structural dimensions, adopting this structure can achieve even more significant space utilization advantages.

[0035] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A V-type two-cylinder engine and EGR cooler integrated structure, characterized in that: include: A cylinder body (1) having two cylinders arranged in a V-shape, wherein a cylinder cooling water cavity (1-1) is provided in the middle of the V-shaped structure formed by the two cylinders on the cylinder body (1), and the cylinder body (1) is provided with a cylinder EGR air inlet (1-2) and a cylinder EGR air outlet (1-3); A water channel cover (2) is provided on the upper opening of the cylinder cooling water cavity (1-1), the water channel cover (2) being provided with a water channel cover cooling water cavity (2-1) and a water channel cover water inlet (2-2), the cylinder cooling water cavity (1-1) being connected to the water channel cover cooling water cavity (2-1) to form an integrated cooling water channel; An EGR cooler (3) is built into the integrated cooling water channel, the EGR cooler (3) comprising an EGR cooler exhaust gas channel (3-1), an inlet end of the EGR cooler exhaust gas channel (3-1) being in communication with the cylinder EGR air inlet (1-2), and an outlet end of the EGR cooler exhaust gas channel (3-1) being in communication with the cylinder EGR air outlet (1-3); The cooling water enters the integrated cooling water channel from the water channel cover water inlet (2-2), cools the high-temperature exhaust gas in the EGR cooler exhaust gas channel (3-1), and then enters the water jacket of each cylinder block (1); Exhaust gas discharged from the exhaust pipe enters the EGR cooler exhaust channel (3-1) through the cylinder EGR air inlet (1-2), undergoes heat exchange with the cooling water in the integrated cooling water channel, is discharged through the cylinder EGR air outlet (1-3), enters the intake manifold, and is mixed with fresh gas.

2. The V-type two-cylinder engine and EGR cooler integrated structure according to claim 1, characterized in that: The cylinder EGR air inlet (1-2) and the cylinder EGR air outlet (1-3) are formed by machining or precasting channels.

3. The V-type two-cylinder engine and EGR cooler integrated structure according to claim 1, characterized in that: The water inlet (2-2) of the water channel cover is constructed in a curved pipe shape.

4. The V-type two-cylinder engine and EGR cooler integrated structure according to claim 1, characterized in that: A predetermined gap is left between the inner end surface of the water channel cover cooling water cavity (2-1) and the upper end surface of the EGR cooler (3).

5. The V-type two-cylinder engine and EGR cooler integrated structure according to claim 1, characterized in that: The cylinder EGR air inlet (1-2) and the cylinder EGR air outlet (1-3) are respectively arranged at an inclination.

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