Diesel engine with integrated exhaust manifold

Abstract

The invention discloses a diesel engine with an integrated exhaust manifold, which comprises a cylinder cover body, two groups of exhaust passage bodies and a plurality of groups of air inlet passage bodies are respectively arranged on two sides of the interior of the cylinder cover body, integrated exhaust passage outlets are formed in the side faces of the exhaust passage bodies, and EGR outlets are formed in the side faces of one set of exhaust passage bodies. The exhaust manifold and the engine cylinder cover are cast into an integral part according to an integral casting process, so that the exhaust heat recovery efficiency is improved, the temperature rise of cooling liquid is accelerated, the cold start performance is improved, independent exhaust manifolds and fixing parts thereof are reduced, the mass of an engine and the mass of a whole vehicle are reduced, and the cost is reduced. The geometrical shape of the exhaust manifold is accurately designed according to the performance requirement of an engine, so that it is ensured that waste gas can efficiently flow to a turbocharger, and exhaust back pressure is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of diesel engines, and more particularly to a diesel engine with an integrated exhaust manifold. Background Art

[0002] In traditional diesel engine design, the exhaust manifold is usually assembled with the engine cylinder head as a separate component.

[0003] The traditional design has the following shortcomings:

[0004] 1. The efficiency of exhaust heat recovery is low, and the exhaust heat cannot be fully utilized to heat the engine coolant, resulting in a slow engine warm-up process and poor cold start performance. Especially in cold climate conditions, fuel economy and emission performance are greatly affected.

[0005] 2. When the traditional independent exhaust manifold is used with a turbocharger, the exhaust gas flows to the turbine over a long distance, which easily causes turbo hysteresis, making the engine less responsive at low speeds. In addition, the geometric shape control accuracy of the independent exhaust manifold is limited, which easily leads to high exhaust back pressure, affecting the overall efficiency of the engine.

[0006] 3. The existence of independent exhaust manifold, gasket and its fixings increases the weight of the engine and the whole vehicle, which is not only not conducive to improving fuel economy, but also increases assembly steps and production costs. It also brings more potential failure points and reduces long-term reliability.

[0007] 4. During the operation of the engine, the interface is easily damaged due to vibration and other reasons, resulting in gas leakage and functional failure, which affects the service life of the engine. In addition, the independent exhaust manifold increases the difficulty of the engine compartment layout and occupies more space. Therefore, a new technical solution is needed to solve the problem. Summary of the invention

[0008] The object of the present invention is to provide a diesel engine with an integrated exhaust manifold, which solves the problems mentioned in the background art.

[0009] To achieve the above-mentioned object, the present invention provides the following technical solution: a diesel engine with an integrated exhaust manifold, comprising: a cylinder head body, an intake duct body and an exhaust duct body are respectively arranged on both sides of the cylinder head body, the exhaust duct body is arranged in two groups and the intake duct body is arranged in a plurality of groups, the sides of the exhaust duct bodies are all arranged with integrated exhaust duct outlets, one side of the exhaust duct body of one group is arranged with an EGR outlet, and the side of the cylinder head body located on one side of the intake duct body is arranged with an intake duct body that matches and communicates with the intake duct body inlet, a supercharger mounting surface and an EGR flange mounting surface are arranged on the side of the cylinder head body located on one side of the exhaust duct body, the integrated exhaust duct outlet is located on the inner side of the supercharger mounting surface and the EGR outlet is located on the inner side of the EGR flange mounting surface, the cylinder head body between the intake duct body and the exhaust duct body is provided with a plurality of groups of injector mounting seats and injector mounting holes are arranged inside the injector mounting seats, a thermostat seat is arranged at the corner of the cylinder head body located on one side of the exhaust duct body, and the exhaust duct body and the cylinder head body are integrally cast.

[0010] As a preferred embodiment of the present invention, an intake pipe flange mounting surface is provided on the side of the cylinder head body and a plurality of groups of intake pipe flange mounting holes are provided inside the intake pipe flange mounting surface.

[0011] As a preferred embodiment of the present invention, a plurality of groups of cylinder head bolt holes are arranged inside the cylinder head body.

[0012] As a preferred embodiment of the present invention, the side surface of the cylinder head body is provided with second water jacket sand cleaning holes, and the second water jacket sand cleaning holes are provided in two groups and are symmetrically distributed.

[0013] As a preferred embodiment of the present invention, first water jacket sand cleaning holes are arranged inside the supercharger mounting surface, and two groups of the first water jacket sand cleaning holes are arranged and symmetrically distributed.

[0014] As a preferred embodiment of the present invention, a small circulation connection hole is provided on the side of the cylinder head body and the small circulation connection hole is located on the side of the thermostat seat.

[0015] As a preferred embodiment of the present invention, a plurality of groups of EGR connection flange mounting threaded holes are arranged inside the EGR flange mounting surface.

[0016] As a preferred embodiment of the present invention, a plurality of groups of supercharger mounting threaded holes are arranged inside the supercharger mounting surface.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention casts the exhaust manifold and the engine cylinder head into an integral component according to an integrated casting process, thereby improving the exhaust heat recovery efficiency, accelerating the cooling liquid temperature rise, and improving the cold start performance. It reduces the independent exhaust manifold, the sealing gasket and its fixing parts, reduces the weight of the engine and the whole vehicle, and accurately designs the geometric shape of the exhaust manifold according to the engine performance requirements to ensure that the exhaust gas can efficiently flow to the turbocharger and reduce the exhaust back pressure. During installation, the engine cylinder head and other components such as the intake pipe and the turbocharger are accurately assembled by using the inlet pipe flange mounting holes and the cylinder head bolt holes. The circulation control of the coolant is achieved through the thermostat seat, the small circulation connecting holes, etc. The exhaust gas recirculation system is connected by using the EGR connecting flange mounting threaded holes, etc., to ensure that the various systems of the engine work in coordination, and realize the various performance advantages of the integrated exhaust manifold diesel engine of the present invention. When equipped with a turbocharger, the turbo hysteresis phenomenon can be significantly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the intake shaft structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the exhaust side shaft structure of the present invention;

[0021] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention;

[0022] Figure 4 It is a schematic diagram of the inner core and the intake and exhaust duct structure of the present invention.

[0023] In the figure: 1. Cylinder head body; 2. Intake pipe flange mounting hole; 3. Intake pipe flange mounting surface; 4. Cylinder head bolt hole; 5. Intake duct inlet; 6. Injector mounting hole; 7. Thermostat seat; 8. Small circulation connection hole; 9. EGR connection flange mounting threaded hole; 10. EGR outlet; 11. EGR flange mounting surface; 12. Integrated exhaust duct outlet; 13. Supercharger mounting surface; 14. Supercharger mounting threaded hole; 15. First water jacket sand cleaning hole; 16. Second water jacket sand cleaning hole; 17. Exhaust duct body; 18. Intake duct body. DETAILED DESCRIPTION

[0024] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-4The present invention provides a technical solution: a diesel engine with an integrated exhaust manifold, comprising: a cylinder head body 1, an intake duct body 18 and an exhaust duct body 17 are respectively arranged on both sides of the cylinder head body 1, two groups of exhaust duct bodies 17 are arranged and several groups of intake duct bodies 18 are arranged, the cylinder head body 1 is the basic structure of the entire engine cylinder head, and carries the installation and operation of other components, the exhaust duct body 17 is integrated in the cylinder head, and the exhaust gas flows to the integrated exhaust duct outlet 12 through the exhaust duct after being discharged from the cylinder, and its internal structure is optimized to reduce the exhaust back pressure, the intake duct body 18 starts from the intake duct inlet 5 and delivers fresh air to the cylinder, and its shape and size design have an important influence on the intake amount and intake uniformity, the side of the exhaust duct body 17 is provided with an integrated exhaust duct outlet 12, the exhaust gas after combustion passes through the exhaust duct and is discharged from the integrated exhaust duct outlet 12, and directly leads to the turbocharger, and one group of exhaust duct bodies 17 is provided with an EGR outlet 10 on the side, and the EGR outlet 10 is an outlet for exhaust gas in the exhaust gas recirculation system, which is connected to the exhaust duct. The side of the cylinder head body 1 located on the side of the intake duct body 18 is provided with an intake duct inlet 5 that matches and communicates with the intake duct body 18. The side of the cylinder head body 1 located on the side of the exhaust duct body 17 is provided with a supercharger mounting surface 13 and an EGR flange mounting surface 11. The integrated exhaust duct outlet 12 is located on the inner side of the supercharger mounting surface 13 and the EGR outlet 10 is located on the inner side of the EGR flange mounting surface 11. The intake duct body 1 The cylinder head body between 8 and the exhaust duct body 17 is provided with several groups of injector mounting seats, and the injector mounting seats are provided with injector mounting holes 6 inside for installing injectors. The injectors accurately spray fuel into the cylinder for combustion. A thermostat seat 7 is provided at the corner of the cylinder head body 1 on one side of the exhaust duct body 17, and a thermostat is installed. The thermostat controls the circulation path of the coolant according to the coolant temperature to achieve precise adjustment of the engine temperature. The exhaust duct body 17 and the cylinder head body 1 are integrally cast.

[0026] Further improvements, such as Figure 1 As shown: the side of the cylinder head body 1 is provided with an intake pipe flange mounting surface 3 and the interior of the intake pipe flange mounting surface 3 is provided with a plurality of groups of intake pipe flange mounting holes 2, which provide a precise mounting plane for the intake pipe flange, ensure the mounting accuracy, and prevent problems such as intake leakage.

[0027] Further improvements, such as Figure 1 As shown: a plurality of groups of cylinder head bolt holes 4 are arranged inside the cylinder head body 1, and the cylinder head body 1 is tightly connected to the engine block by bolts to ensure the stability of the overall structure of the engine.

[0028] Further improvements, such as Figure 2As shown: the side of the cylinder head body 1 is provided with a second water jacket sand cleaning hole 16, and the second water jacket sand cleaning holes 16 are provided with two groups and are symmetrically distributed, which are used to clean the sand core and other impurities in the water jacket during the casting process to ensure the smoothness of the water jacket and the normal circulation of the coolant.

[0029] Further improvements, such as Figure 2 As shown: the interior of the supercharger mounting surface 13 is provided with a first water jacket sand cleaning hole 15, and the first water jacket sand cleaning holes 15 are provided with two groups and are symmetrically distributed, and are used to clean the sand core and other impurities in the water jacket during the casting process to ensure the smoothness of the water jacket and the normal circulation of the coolant.

[0030] Further improvements, such as Figure 2 As shown: a small circulation connection hole 8 is provided on the side of the cylinder head body 1 and the small circulation connection hole 8 is located on the side of the thermostat seat 7, and cooperates with the thermostat to control the small circulation path of the coolant during the engine preheating stage, so that the coolant can quickly heat up inside the engine.

[0031] Further improvements, such as Figure 2 As shown: a plurality of groups of EGR connection flange mounting threaded holes 9 are arranged inside the EGR flange mounting surface 11, and the EGR flange mounting surface provides a mounting plane for the EGR connection flange to ensure the sealing and stability of the connection.

[0032] Further improvements, such as Figure 2 As shown: the interior of the supercharger mounting surface 13 is provided with a plurality of supercharger mounting threaded holes 14, which provide a mounting plane for the turbocharger and ensure the accurate docking of the supercharger with the exhaust duct outlet.

[0033] Working principle: During the operation of the engine, the exhaust gas after combustion is discharged from the cylinder. The exhaust duct body 17 and the cylinder head body 1 are integrally cast, and the exhaust gas can directly enter the integrated exhaust duct body 17; this integrated structure reduces the heat loss during the exhaust gas transmission process, so that more exhaust heat can be effectively recycled and utilized, and the engine preheating process is accelerated through heat exchange with the engine coolant; especially when starting in cold weather, the coolant can be heated to a suitable operating temperature more quickly, improving the fuel atomization effect, thereby improving fuel economy and reducing harmful gas emissions; when the diesel engine is equipped with a turbocharger, the integrated The integrated exhaust duct body 17 shortens the distance that the exhaust gas flows to the turbine; the exhaust gas can quickly reach the turbocharger after being discharged from the cylinder, reducing the turbo lag phenomenon; because the exhaust gas transmission path is short, under low speed conditions, the turbine can respond more quickly to changes in exhaust gas energy, increase the intake pressure, and allow the engine to obtain more air, thereby improving combustion efficiency, enhancing the engine's power output, and improving the engine's response speed at low speed; the geometric shape of the integrated exhaust duct body 17 is precisely controlled, and the exhaust gas flow path is optimized according to the principles of fluid mechanics; the exhaust duct's pipe diameter, curvature and other parameters are reasonably designed, so that the exhaust gas can flow smoothly in the exhaust duct , reducing airflow turbulence and resistance, and reducing exhaust back pressure; lower exhaust back pressure helps to discharge exhaust gas in the cylinder, making it easier for fresh air to enter the cylinder, improving charging efficiency, and thus improving the overall efficiency of the engine; due to the reduction of independent exhaust manifolds, gaskets and their fixings, the overall weight of the engine can be reduced; according to Newton's second law, when the vehicle weight is reduced, the inertial force that needs to be overcome during driving is reduced, and the energy required by the engine to drive the vehicle is reduced, thereby improving fuel economy and reducing the vehicle's carbon dioxide and other pollutant emissions; the integrated solution simplifies the assembly steps and directly installs the cylinder head with the exhaust manifold The integrated design reduces the number of assembly links for parts and reduces production costs. At the same time, it reduces the number of connection points between parts, which reduces the number of potential failure points and improves long-term reliability. The one-piece design avoids the risk of damage such as loosening and wear of parts at traditional interfaces due to engine vibration and other reasons, extending the service life of the engine. The more compact design makes the engine compartment layout more flexible. The integrated exhaust manifold reduces the need for external pipes, makes the engine structure more compact, saves engine compartment space, and provides more available space for the vehicle. It is especially suitable for small cars or compact models, and is convenient for the layout and optimization of other vehicle systems.

[0034] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0035] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, and can be mechanical or electrical connections, or internal connectivity between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may change.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A diesel engine with an integrated exhaust manifold, characterized in that: include: A cylinder head body (1), wherein an intake duct body (18) and an exhaust duct body (17) are respectively arranged on both sides of the cylinder head body (1), wherein two groups of the exhaust duct bodies (17) are arranged and a plurality of groups of the intake duct bodies (18) are arranged, and the sides of the exhaust duct bodies (17) are all arranged with integrated exhaust duct outlets (12), wherein one group of the exhaust duct bodies (17) is arranged with an EGR outlet (10), and the side of the cylinder head body (1) located on one side of the intake duct body (18) is arranged with an intake duct inlet (5) that matches and communicates with the intake duct body (18), and the side of the cylinder head body (1) located on one side of the exhaust duct body (17) is arranged with an exhaust gas outlet (12). A supercharger mounting surface (13) and an EGR flange mounting surface (11) are arranged on the side of the body (1); the integrated exhaust duct outlet (12) is located on the inner side of the supercharger mounting surface (13) and the EGR outlet (10) is located on the inner side of the EGR flange mounting surface (11); a cylinder head body between the intake duct body (18) and the exhaust duct body (17) is provided with a plurality of groups of injector mounting seats and the injector mounting seats are provided with injector mounting holes (6); a thermostat seat (7) is arranged at the corner of the cylinder head body (1) on one side of the exhaust duct body (17); and the exhaust duct body (17) and the cylinder head body (1) are integrally cast.

2. A diesel engine with an integrated exhaust manifold according to claim 1, characterized in that: An intake pipe flange mounting surface (3) is arranged on the side of the cylinder head body (1), and a plurality of groups of intake pipe flange mounting holes (2) are arranged inside the intake pipe flange mounting surface (3).

3. A diesel engine with an integrated exhaust manifold according to claim 1, characterized in that: A plurality of groups of cylinder head bolt holes (4) are arranged inside the cylinder head body (1).

4. A diesel engine with an integrated exhaust manifold according to claim 1, characterized in that: The side surface of the cylinder head body (1) is provided with second water jacket sand cleaning holes (16), and the second water jacket sand cleaning holes (16) are provided in two groups and are symmetrically distributed.

5. A diesel engine with an integrated exhaust manifold according to claim 1, characterized in that: The interior of the supercharger mounting surface (13) is provided with first water jacket sand cleaning holes (15), and the first water jacket sand cleaning holes (15) are provided in two groups and are symmetrically distributed.

6. A diesel engine with an integrated exhaust manifold according to claim 1, characterized in that: A small circulation connection hole (8) is provided on the side of the cylinder head body (1), and the small circulation connection hole (8) is located on the side of the thermostat seat (7).

7. A diesel engine with an integrated exhaust manifold according to claim 1, characterized in that: A plurality of groups of EGR connection flange mounting threaded holes (9) are arranged inside the EGR flange mounting surface (11).

8. A diesel engine with an integrated exhaust manifold according to claim 1, characterized in that: A plurality of groups of supercharger mounting threaded holes (14) are arranged inside the supercharger mounting surface (13).

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