CN212272403U

CN212272403U - Engine cylinder cover

Info

Publication number: CN212272403U
Application number: CN202020067463.0U
Authority: CN
Inventors: 梁静
Original assignee: Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2020-01-10
Filing date: 2020-01-10
Publication date: 2021-01-01
Anticipated expiration: 2030-01-10

Abstract

The application discloses an engine cylinder cover, which comprises a plurality of combustion chambers which are uniformly distributed, wherein the top wall of each combustion chamber is provided with a group of intake valve seat holes and a group of exhaust valve seat holes which are distributed side by side, and a step structure is arranged below each intake valve seat hole; and the center of the top wall of each combustion chamber is also provided with a spark plug mounting hole and an oil injector mounting hole, and the center connecting line of the spark plug mounting hole and the oil injector mounting hole on the surface of the top wall is parallel to the center connecting line of each group of intake valve seat holes or the center connecting line of each group of exhaust valve seat holes. The engine cylinder cover has a good combustion system, oil consumption can be reduced, emission can be improved, and the dynamic property and the economical efficiency of an engine are improved.

Description

Engine cylinder cover

Technical Field

The application relates to the technical field of automobiles, in particular to an engine cylinder cover.

Background

With the continuous reform of national energy policy, especially the proposition and upgrade of new energy development strategy, and the increasing strictness of automobile oil consumption and emission regulations, the internal combustion engine for automobile faces serious challenges, and the technical upgrade is urgently needed. For internal combustion engines for vehicles, cleaner emission levels and higher combustion thermal efficiency are necessary requirements for technical upgrading and are the core points of technical competition among automobile enterprises. The pressurized direct injection technology has obvious effects on the aspects of saving energy consumption, reducing PN (particulate matter quantity) emission and the like, and gradually becomes a preferred technical scheme of each automobile enterprise.

Different injector arrangements have different requirements on the design of the combustion system and the formation of the mixture. Due to the limitations of the whole engine arrangement and the oil injection technology, the direct injection engines of various automobile enterprises at present mostly adopt an arrangement scheme that an oil injector is arranged below an intake manifold.

The inventor finds that the arrangement mode of the fuel injector has at least the following problems: after ignition, flame combustion is uneven, knocking is easily caused, noise is large, combustion characteristics of the engine are easily not ideal, and requirements on power performance, economic performance and emission level of the engine cannot be met.

Disclosure of Invention

In order to solve the above problems, the present application provides an engine cylinder head capable of reducing oil consumption and improving emission.

The following technical scheme is specifically adopted in the application:

an engine cylinder head comprises a plurality of combustion chambers which are uniformly distributed, wherein the top wall of each combustion chamber is provided with a group of intake valve seat holes and a group of exhaust valve seat holes which are distributed side by side, and a step structure is arranged below the intake valve seat holes;

and the center of the top wall of each combustion chamber is also provided with a spark plug mounting hole and an oil injector mounting hole, and the center connecting line of the spark plug mounting hole and the oil injector mounting hole on the surface of the top wall is parallel to the center connecting line of each group of intake valve seat holes or the center connecting line of each group of exhaust valve seat holes.

Preferably, every group intake valve seat circle hole includes two intake valve seat circle holes, two intake valve seat circle hole is connected with two branches of same intake duct, the intake duct is the outside convex fish maw shape structure in one side.

Preferably, the throat part of the air inlet channel is a channel structure with two ends gradually widened towards the middle, and the throat part is the joint of the branch of the air inlet channel and the inlet valve seat ring hole.

Preferably, each group of exhaust valve seat holes comprises two exhaust valve seat holes, and the two exhaust valve seat holes are connected with two branches of the same exhaust passage.

Preferably, a plurality of the air inlet channels are uniformly arranged on one side of the cylinder cover, and each air inlet channel corresponds to one air inlet; the exhaust passages are uniformly arranged on the other side of the cylinder cover, and each exhaust passage extends towards the outlet and is converged to the same air outlet.

Preferably, the cylinder head further includes a first water jacket provided above the exhaust passage and a second water jacket provided below the exhaust passage, the first water jacket and the second water jacket being in communication with each other.

Preferably, the first water jacket and the second water jacket are communicated through a first connecting column and a second connecting column adapted to circulate cooling water in the first water jacket and the second water jacket.

Preferably, the first water jacket and the second water jacket are fixedly connected or detachably connected.

Preferably, the combustion chamber is arranged at the bottom of the cylinder head, and a piston is further arranged in the combustion chamber.

Preferably, a spark plug is arranged in the spark plug mounting hole, a fuel injector is arranged in the fuel injector mounting hole, and the fuel injector is vertically mounted at the top of the combustion chamber.

The fuel injector is arranged at the middle position of the top of the combustion chamber by the engine cylinder cover, homogeneous atomization and combustion can be achieved, and gas emission is effectively reduced. The air inlet passage cooperates the stair structure at the seat ring hole of the air inlet valve, so that the entering air can produce violent impact at the stair structure after flowing into the combustion chamber, and strong tumble is obtained, the speed and the strength of oil-gas mixing can be further enhanced, the combustion speed is improved, and the emission effect is further improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural view of a combustor top provided by an embodiment of the present application;

FIG. 2 is a schematic structural diagram of an intake duct provided in an embodiment of the present application;

FIG. 3 is a schematic layout of intake and exhaust ports within a cylinder head according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural view of an intake side of a cylinder head according to an embodiment of the present disclosure;

FIG. 5 is a schematic view of an exhaust side structure of a cylinder head according to an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a cooling water jacket provided in an embodiment of the present application;

fig. 7 is a schematic view of the flow direction of the coolant in the first water jacket;

fig. 8 is a schematic view of the flow direction of the coolant in the second water jacket;

FIG. 9 is an assembly view of the spark plug and fuel injector on the cylinder head;

FIG. 10 is a schematic view of an intake passage and combustion chamber connection of a cylinder head provided in an embodiment of the present application.

Reference numerals:

1. an intake valve seat ring hole; 11. a step structure;

2. an exhaust valve seat ring hole;

3. a spark plug mounting hole; 31. a spark plug;

4. a fuel injector mounting hole; 41. an oil injector;

5. an air inlet channel; 51. an air inlet; 52. a fish belly shaped structure; 53. a channel structure;

6. an exhaust passage; 61. an air outlet;

7. a first water jacket; 701-710: a position where the coolant flows in the first water jacket; 711. an outlet;

8. a second water jacket; 801-805 positions where the cooling liquid flows in the second water jacket; 81. a first connecting column; 82. a second connecting column.

Detailed Description

In order to make the technical solutions and advantages of the present application clearer, the following will describe the embodiments of the present application in further detail with reference to the accompanying drawings.

The embodiment of the application provides an engine cylinder head, including evenly distributed's a plurality of combustion chamber, as shown in fig. 1, the roof of every combustion chamber is equipped with a set of intake valve seat hole 1 and a set of exhaust valve seat hole 2 that distribute side by side. And the center of the top wall of each combustion chamber is also provided with a spark plug mounting hole 3 and an oil injector mounting hole 4, and the central connecting line of the spark plug mounting hole 3 and the oil injector mounting hole 4 on the surface of the top wall is parallel to the central connecting line of each group of inlet valve seat holes 1 or the central connecting line of each group of exhaust valve seat holes 2.

Illustratively, as shown in fig. 1, the centers of the intake valve seat holes 1 in each group of intake valve seat holes 1 are a horizontal straight line if they are connected, the centers of the exhaust valve seat holes 2 in each group of exhaust valve seat holes 2 are a horizontal straight line if they are connected, and the group of intake valve seat holes 1 and the group of exhaust valve seat holes 2 are arranged side by side. Spark plug mounting holes 3 and fuel injector mounting holes 4 which are arranged in parallel are arranged between the group of intake valve seat holes 1 and the group of exhaust valve seat holes 2, and the central connecting line of the spark plug mounting holes 3 and the fuel injector mounting holes is parallel to the central connecting line of each intake valve seat hole 1 in each group of intake valve seat holes 1 or the central connecting line of each exhaust valve seat hole 2 in each group of exhaust valve seat holes 2. The lateral direction described in this example is one possible orientation of the relevant components of the cylinder head provided herein, and is for descriptive purposes only. The arrangement direction of the components can also be other directions according with the structural design requirement of the cylinder cover.

As shown in fig. 10, a step structure 11 is provided below the intake valve seat hole 1.

In some embodiments, the step structure 11 may be a truncated cone structure. When fresh air enters the combustion chamber through the air inlet 51 along the air inlet channel 5, because the space in the combustion chamber is limited, a large amount of inrush air flow can generate impact on the step structure 11 when flowing back in the combustion chamber, so that strong tumble is formed, the speed and the strength of oil-gas mixing are enhanced, the combustion speed is increased, and the emission effect is finally improved.

According to the engine cylinder cover provided by the embodiment, the fuel injector is arranged at the top of the combustion chamber, layered lean combustion in the cylinder is realized through modes of direct fuel injection in the cylinder, variable fuel injection timing, control of air flow movement in the cylinder and the like, the fuel consumption can be effectively reduced, the emission is reduced, and the advantages of an in-cylinder direct injection technology are more fully exerted.

Compared with the side arrangement of the fuel injector, the mode of middle-mounted direct injection has the advantages of more homogeneous atomization and combustion. In the catalyst stage of cold start working condition, ignition is generally required to be delayed to improve exhaust energy, so that catalyst ignition time is shortened, gas emission is reduced, and a spray guiding mode is adopted in a mid-direct injection engine, so that oil injection can be carried out after compression top dead center, and on the premise that an oil beam does not wet the top surface of a piston, a dense mixed gas is formed near a spark plug, so that ignition stability is improved. Compared with a side direct injection engine, the ignition angle of the engine can be delayed by 5-15 degrees, the exhaust energy is greatly improved, the condition that a piston wets the wall is effectively improved and even avoided, and the PN emission is greatly reduced.

In some implementation manners of the embodiment of the present application, each group of intake valve seat holes 1 includes two intake valve seat holes 1, the two intake valve seat holes 1 are connected with two branches of the same intake duct 5, and the intake duct 5 is a fish-belly-shaped structure 52 with one side protruding outwards.

In some embodiments, each intake duct 5 comprises two symmetrical branches, the ends of which are connected to two intake valve seat holes 1 at the top of the same combustion chamber, respectively. To achieve a greater tumble ratio, the inlet duct 5 is provided with a convex fish-belly 52 on one side, as shown in fig. 2. The air inlet passage structure can further improve the size of the tumble ratio under the condition of satisfying the arrangement condition of the cylinder cover, and can enable oil-gas mixing to be more sufficient by matching with the step structure, so that the emission effect is further improved.

In some implementations of the embodiment of the present application, as shown in fig. 3, a throat portion of the intake duct 5 is a channel structure 53 whose two ends gradually widen toward the middle, and the throat portion is a connection between a branch of the intake duct 5 and the intake valve seat hole 1.

The cross section of the throat part of the air inlet 5 is reduced, and the step structure 11 is matched to limit the airflow of the throat part and strengthen the airflow of other throat parts, so that the purpose of further increasing the tumble ratio is achieved.

In some implementations of embodiments of the present application, as shown in fig. 3, each set of exhaust valve seat holes 2 includes two exhaust valve seat holes 2, and the two exhaust valve seat holes 2 are connected to two branches of the same exhaust duct 6.

In some embodiments, each exhaust passage 6 also includes two branches, the ends of which are connected to two exhaust valve seat holes 2 at the top of the same combustion chamber, respectively.

In some implementations of embodiments of the present application, as shown in fig. 3-5, a plurality of intake ports 5 are uniformly arranged on one side of the cylinder head cavity, and each intake port 5 corresponds to one intake port 51. The exhaust passages 6 are uniformly arranged on the other side of the cylinder cover, and each exhaust passage 6 extends towards the outlet direction and is converged to one air outlet 61.

In some embodiments, the intake ports 5 are evenly distributed in the cylinder head cavity, the intake ports 51 are evenly arranged on the intake side of the cylinder head, and air enters from the intake ports 51 and flows into the combustion chamber along the intake ports 5. The exhaust ducts 6 are also arranged uniformly in the interior of the cylinder head, the inner walls of the exhaust ducts 6 extending gradually outwards and merging into a total exhaust duct comprising an outlet 61 arranged on the exhaust side of the cylinder head. The air is discharged from the branches of each exhaust duct 6, collected at the main exhaust passage, and finally discharged to the outside through the air outlet 61.

The exhaust passage that this application embodiment adopted has integrateed the exhaust manifold's of traditional engine function, has increaseed the heat radiating area of exhaust passage, and engine cooling system can make full use of the temperature that the back exhaust brought for the programming rate of engine coolant liquid reaches the effect of quick warm-up, promotes the travelling comfort of driving.

In some implementations of the embodiments of the present application, the cylinder head further includes a first water jacket 7 provided above the exhaust passage 6 and a second water jacket 8 provided below the exhaust passage 6 as shown in fig. 6, the first water jacket 7 and the second water jacket 8 communicating with each other.

In some implementations of embodiments of the present application, the first water jacket 7 communicates with the second water jacket 8 through first and second connecting

posts

81 and 82, and the first and second connecting

posts

81 and 82 are adapted to circulate cooling water in the first and

second water jackets

7 and 8.

The first water jacket 7 and the second water jacket 8 are wrapped on the outer side of the exhaust passage 6, the coolant in the second water jacket 8 flows into the first water jacket 7 through the first connecting post 81 and the second connecting post 82, and finally all the coolant flows to the radiator through the outlet 711. The cooling water jacket can independently cool each cylinder, ensures that each cylinder is uniformly cooled, and has better consistency. The first water jacket 7 wraps the exhaust guide pipe part to cool the exhaust guide pipe, and the cooling liquid of the second water jacket 8 flows in from the column base to mainly cool the exhaust passage 6 in a centralized way.

Illustratively, as shown in FIG. 7, in the first water jacket 7, the coolant enters from positions 701-706, flows through

positions

707, 708, 709, and 710, and enters the radiator through an outlet 711.

Illustratively, as shown in fig. 8, in the second water jacket 8, the coolant enters from the column base 801, flows through the

positions

802, 803, 804 and 805, and then flows out from the first connecting column 81 and the second connecting column 82, the first connecting column 81 and the second connecting column 82 communicate with the first water jacket 7, and the coolant enters the first water jacket 7.

In some implementations of embodiments of the present application, the first water jacket 7 and the second water jacket 8 are fixedly connected.

The design scheme of the exhaust passage and the cooling water jacket in the embodiment of the application can reduce the exhaust temperature of the engine by 50-70 ℃ under the full-load working condition, and effectively inhibit knocking at low speed and high load, thereby improving the PN emission of the engine.

In some implementations of embodiments of the present application, the combustion chamber is disposed at a bottom of the cylinder head, and a piston is further disposed within the combustion chamber.

In some implementations of the embodiments of the present application, the ignition plug 31 is provided in the ignition plug mounting hole 3, the injector 41 is provided in the injector mounting hole 4, and the injector 41 is vertically mounted on the top of the combustion chamber.

When the oil injector and the spark plug are arranged, if the distance between the sprayed oil beam and the spark plug is too close, the spark plug can be wetted, the service life of the spark plug is reduced, and the condition of fire catching even caused by extreme conditions can be avoided; if the distance between the sprayed oil jet and the spark plug is too long, it is not favorable for forming a relatively dense mixed gas near the spark plug, and it is difficult to fully exert the advantage of the centrally-arranged oil injector. Therefore, the distance d between the spark plug and the oil injector is 8-18 cm, and the arrangement included angle theta between the spark plug and the oil injector is 10-35 degrees.

The engine cylinder cover provided by the embodiment of the application arranges the oil injector at the middle position of the top of the combustion chamber, so that the in-cylinder direct injection technology can be better exerted, the combustion efficiency of fuel can be improved, the ignition stability can be improved, the oil consumption can be effectively reduced, and the PN emission can be reduced.

The engine cylinder head that this application embodiment provided through designing the intake duct into the tripe structure, combines to set up the stair structure at intake valve seat insert hole department and sets up the channel structure at the throat position, can obtain more strong intake tumble, makes the in-cylinder combustion more abundant, has also improved the emission of burning particulate matter when reducing the oil consumption.

The engine cylinder head that this application embodiment provided has integrateed exhaust manifold, has increaseed the heat radiating area of exhaust passage, and engine cooling system can make full use of the carminative heat of bringing after the burning, makes the engine coolant liquid temperature rise accelerate to reach the effect of quick warm-up.

According to the engine cylinder cover provided by the embodiment of the application, the cooling water jackets in the form of the split structures of the upper layer and the lower layer are arranged on the outer side of the exhaust passage, so that the cooling speed of the exhaust passage can be increased, the exhaust temperature of the engine under the full-load working condition is reduced by 50-70 ℃, knocking is effectively inhibited under low-speed and high-load conditions, and the PN emission of the engine is improved.

In the present application, it is to be understood that the terms "first", "second", "third", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated.

The above description is only for facilitating the understanding of the technical solutions of the present application by those skilled in the art, and is not intended to limit the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An engine cylinder head comprises a plurality of combustion chambers which are uniformly distributed, and is characterized in that the top wall of each combustion chamber is provided with a group of intake valve seat holes (1) and a group of exhaust valve seat holes (2) which are distributed side by side, and a step structure (11) is arranged below each intake valve seat hole (1);

and the center of the top wall of each combustion chamber is also provided with a spark plug mounting hole (3) and an oil injector mounting hole (4), and the central connecting line of the spark plug mounting hole (3) and the oil injector mounting hole (4) on the surface of the top wall is parallel to the central connecting line of each group of intake valve seat holes (1) or the central connecting line of each group of exhaust valve seat holes (2).

2. The engine cylinder head according to claim 1, characterized in that each group of intake valve seat holes (1) comprises two intake valve seat holes (1), two intake valve seat holes (1) are connected with two branches of the same intake duct (5), and the intake duct (5) is a fish-belly-shaped structure (52) with one side protruding outwards.

3. The engine cylinder head according to claim 2, characterized in that the throat portion of the intake duct (5) is a channel structure (53) having two ends gradually widened toward the middle, and the throat portion is a junction of a branch of the intake duct (5) and the intake valve seat hole (1).

4. An engine cylinder head according to claim 3, characterized in that each group of the exhaust valve seat holes (2) comprises two exhaust valve seat holes (2), two exhaust valve seat holes (2) being connected to two branches of the same exhaust passage (6).

5. The engine cylinder head according to claim 4, characterized in that a plurality of the intake ports (5) are arranged uniformly on one side of the cylinder head cavity, one intake port (51) for each intake port (5); the exhaust passages (6) are uniformly arranged on the other side of the cylinder cover, and the exhaust passages (6) extend towards the outlet direction and are converged to the same air outlet (61).

6. The engine cylinder head according to claim 4 or 5, further comprising a first water jacket (7) provided above the exhaust passage (6) and a second water jacket (8) provided below the exhaust passage (6), the first water jacket (7) and the second water jacket (8) communicating with each other.

7. The engine cylinder head according to claim 6, characterized in that the first water jacket (7) communicates with the second water jacket (8) through a first connecting post (81) and a second connecting post (82), the first connecting post (81) and the second connecting post (82) being adapted to circulate coolant in the first water jacket (7) and the second water jacket (8).

8. The engine cylinder head according to claim 7, characterized in that the first water jacket (7) and the second water jacket (8) are fixedly connected.

9. The engine cylinder head of claim 1, wherein said combustion chamber is disposed at a bottom of said cylinder head, and a piston is further disposed within said combustion chamber.

10. An engine cylinder head according to claim 1, characterized in that an ignition plug (31) is provided in the ignition plug mounting hole (3), an injector (41) is provided in the injector mounting hole (4), and the injector (41) is vertically mounted on the top of the combustion chamber.