CN212154964U

CN212154964U - Cylinder cover structure and gasoline engine

Info

Publication number: CN212154964U
Application number: CN202020636777.8U
Authority: CN
Inventors: 李金成; 杨文蕾; 韩令海; 陈明; 刘东航; 张天宇; 孙明陆
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2020-12-15
Anticipated expiration: 2030-04-24

Abstract

The utility model relates to the technical field of engines, a cylinder head structure and gasoline engine is disclosed. The cylinder cover structure comprises a cylinder cover body, a precombustion chamber and a cooling water jacket, wherein the precombustion chamber is arranged on the cylinder cover body, the precombustion chamber and the cylinder cover body are of an integrated structure, the cooling water jacket is arranged on the cylinder cover body, and the cooling water jacket is used for cooling the precombustion chamber. Through setting up cylinder head body and precombustion chamber into the integral type structure, can save the assembly space of precombustion chamber, realize the compact arrangement of cylinder head structure, and can avoid the assembly error between precombustion chamber and the cylinder head body, guarantee the reliability of assembly between the two, the cooling jacket who adopts setting up on the cylinder head body cools off the precombustion chamber, can make the precombustion chamber inside remain throughout in a reasonable temperature range, avoid the precombustion chamber nozzle to melt because of overheated phenomenon emergence of perhaps damaging, can prolong the life of sparking plug simultaneously.

Description

Cylinder cover structure and gasoline engine

Technical Field

The utility model relates to the technical field of engines, especially, relate to a cylinder head structure and gasoline engine.

Background

A gasoline engine is an electric spark ignition type internal combustion engine using gasoline as a fuel. With the pursuit of engine technology for higher and higher thermal efficiency, a prechamber technology is generally proposed, i.e. the whole combustion area is divided into a main combustion chamber and a prechamber, a fuel injector and a spark plug are arranged in the prechamber, fuel is firstly injected into the prechamber, the spark plug in the prechamber ignites and burns, the pressure in the prechamber rapidly rises, high-temperature gas enters the main combustion chamber through a channel in a flame jet mode, and a plurality of flames are developed in the main combustion chamber to ignite thin mixed gas in the main combustion chamber. The method can lead the flame to go deeper into the main combustion chamber, contact more unburnt mixed gas, improve ignition energy and strengthen airflow disturbance in the combustion chamber. Compared with the traditional spark plug ignition, the combustion speed can be greatly improved by the precombustion chamber, the center of gravity of combustion is advanced, lean combustion is realized, and the heat efficiency of the engine is improved.

In the prior art, the prechamber housing is manufactured separately and then assembled to the cylinder head by press fitting or other attachment means. On the one hand, a large installation space is needed, the small gasoline engine is difficult to realize, on the other hand, the pre-combustion chamber shell is almost isolated from the outside, the pre-combustion chamber works at a high temperature for a long time, if the temperature of the pre-combustion chamber is too high, the service life of a spark plug in the pre-combustion chamber is greatly shortened, a nozzle of the pre-combustion chamber can be melted or damaged due to overheating, and the pre-combustion chamber can be caused by the formation of a hot spot due to the too high local temperature.

SUMMERY OF THE UTILITY MODEL

Based on above, an object of the utility model is to provide a cylinder head structure and gasoline engine, saved the assembly space of precombustion chamber, realize the miniaturization of gasoline engine, and can carry out timely cooling to the precombustion chamber.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a cylinder head structure comprising:

a cylinder head body;

the pre-combustion chamber is arranged on the cylinder cover body, and the pre-combustion chamber and the cylinder cover body are of an integrated structure;

a cooling water jacket provided on the cylinder head body, the cooling water jacket being for cooling the pre-chamber.

Preferably, the cylinder head body is made by casting.

As a preferable scheme of the cylinder head structure, a stepped hole is formed in the cylinder head body, a small-end of the stepped hole forms the precombustion chamber, a spark plug is accommodated in the precombustion chamber, a large-end of the stepped hole is used for connecting an ignition coil, and the ignition coil is connected with the spark plug.

As a preferable aspect of the cylinder head structure, the bottom of the precombustion chamber is provided with injection holes configured to communicate with the main combustion chamber.

As a preferable mode of the cylinder head structure, the number of the injection holes is plural, and the plural injection holes are arranged at intervals along the bottom of the precombustion chamber.

As a preferable scheme of the cylinder head structure, a fuel injector hole is further formed in the cylinder head body, and the fuel injector hole is communicated with the main combustion chamber.

As a preferable aspect of the cylinder head structure, the cylinder head body is further provided with a fuel injector hole that communicates with the precombustion chamber.

As a preferable aspect of the cylinder head structure, the cooling water jacket includes a water inlet and a water outlet that communicate with a cooling water passage of the cylinder head body.

As a preferable aspect of the cylinder head structure, the cylinder head structure further includes an electronic water pump and an ECU controller for controlling water flow in the cooling water jacket.

In order to achieve the purpose, the utility model also provides a gasoline engine, including the cylinder head structure as in any one above scheme.

The utility model has the advantages that:

the utility model provides a cylinder head structure, this cylinder head structure include cylinder head body, precombustion chamber and cooling jacket, cylinder head body and precombustion chamber formula structure as an organic whole, and cooling jacket sets up on the cylinder head body for cool off the precombustion chamber. Through setting up cylinder head body and precombustion chamber into the integral type structure, the assembly space of precombustion chamber can be saved, realize the compact arrangement of cylinder head structure, and can avoid the assembly error between precombustion chamber and the cylinder head body, guarantee the reliability of assembly between the two, the cooling jacket who adopts to set up on the cylinder head body carries out reasonable cooling to the precombustion chamber, can make the precombustion chamber inside remain throughout in a reasonable temperature range, avoid the precombustion chamber nozzle to melt or the phenomenon of damage takes place because of overheated, can prolong the life of sparking plug simultaneously.

The utility model provides a gasoline engine, including above-mentioned cylinder head structure, through setting up cylinder head body and precombustion chamber into the integral type structure, can save the assembly space of precombustion chamber, realize the compact of cylinder head structure and arrange to realize gasoline engine's miniaturization.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a bottom view of the cylinder head structure provided by the present invention;

FIG. 2 is a cross-sectional view of FIG. 1 at A-A;

FIG. 3 is a schematic view of the spark plug of FIG. 2 with the spark plug installed;

FIG. 4 is a cross-sectional view of FIG. 1 at B-B;

FIG. 5 is a schematic view of the spark plug of FIG. 4 with the spark plug installed;

FIG. 6 is a cross-sectional view of FIG. 1 at C-C;

fig. 7 is a schematic view of the structure of fig. 6 with the spark plug mounted.

In the figure:

1-a cylinder head body; 11-fuel injector orifice; 12-injector orifice;

2-a precombustion chamber; 21-an injection hole;

3-cooling the water jacket; 4-main combustion chamber; 5-spark plug.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1 to 7, the present embodiment provides a cylinder head structure including a cylinder head body 1, a pre-chamber 2, and a cooling water jacket 3, wherein the pre-chamber 2 is provided on the cylinder head body 1, and the pre-chamber 2 is an integral structure with the cylinder head body 1, the cooling water jacket 3 is provided on the cylinder head body 1, and the cooling water jacket 3 is used to cool the pre-chamber 2.

The cylinder head structure that this embodiment provided, set up to the integral type structure through with cylinder head body 1 and precombustion chamber 2, can save the assembly space of precombustion chamber 2, realize the compact arrangement of cylinder head structure, and can avoid the assembly error between precombustion chamber 2 and the cylinder head body 1, guarantee the reliability of assembly between the two, the cooling jacket 3 that adopts to set up on the cylinder head body 1 carries out reasonable cooling to precombustion chamber 2, can make 2 inside of precombustion chamber keep in a reasonable temperature range all the time, avoid the nozzle in the precombustion chamber 2 to melt or the phenomenon of damage to take place because of overheated, can prolong the life of spark plug 5 simultaneously.

Specifically, the cylinder head body 1 is manufactured in a casting mode, after the casting of the cylinder head body 1 is completed, a stepped hole is machined on the cylinder head body 1, a small opening end of the stepped hole forms a precombustion chamber 2, a spark plug 5 is accommodated in the precombustion chamber 2, a large opening end of the stepped hole is used for being connected with an ignition coil, and the ignition coil is connected with the spark plug 5. The manufacturing process is simple and the manufacturing cost is low. It should be noted that, during the manufacturing process, the outer shape of the prechamber 2 is optimally designed in combination with the overall structure of the cylinder head body 1, and the outer shape of the prechamber 2 is not limited to the structural form in the drawings.

Preferably, be provided with the internal thread on the macrostoma end of shoulder hole, be provided with the external screw thread on the spark plug 5, 5 threaded connection in the macrostoma end of shoulder hole realize the two fixed, and threaded connection still has processing simply, easy dismounting's advantage, the convenient dismantlement to spark plug 5, the change of being convenient for.

Further, the bottom of the prechamber 2 is provided with injection holes 21, the injection holes 21 being configured to communicate with the main combustion chamber 4. Preferably, the number of the injection holes 21 is plural, and the plural injection holes 21 are provided at intervals along the bottom of the precombustion chamber 2.

Further, the cylinder head body 1 is further provided with an injector hole 12 and a fuel injector hole 11, the injector hole 12 is communicated with the main combustion chamber 4, and the fuel injector hole 11 is communicated with the prechamber 2. When the engine starts to work, the mixture of gasoline and air is sprayed into the precombustion chamber 2 through the fuel injector holes 11, and is ignited and combusted by the spark plug 5 in the precombustion chamber 2, so that the pressure in the precombustion chamber 2 is rapidly increased, high-temperature gas is promoted to enter the main combustion chamber 4 through the spray holes 21 in the form of flame jet flow, a plurality of flames are developed in the main combustion chamber 200 to ignite the thin mixed gas in the main combustion chamber 4, the flames can be deeper into the main combustion chamber 4 to contact more unburnt mixed gas, the ignition energy is improved, and the airflow disturbance in the combustion chamber is enhanced. Compare traditional spark plug ignition, prechamber 2 can improve burning speed by a wide margin, and the focus burns in advance, realizes rarefied combustion, improves engine thermal efficiency.

Further, the cooling water jacket 3 includes a water inlet and a water outlet that communicate with the cooling water passage of the cylinder head body 1. The water inlet and the water outlet of the cooling water jacket 3 are respectively communicated with the cooling water channel of the cylinder cover body 1. Compare with prior art at one set of cooling water jacket of independent integration in precombustion chamber 2's casing, the cylinder head structure that this embodiment provided utilizes the cooling water course of cylinder head body 1 itself to cool off for precombustion chamber 2 simultaneously, and the structure is comparatively simple, can reduce cylinder head body 1's arrangement space, reduces manufacturing cost, and can realize mass production.

As shown in fig. 2-7, the cooling water jacket 3 surrounds the prechamber 2 and the fuel injector holes 11, so as to effectively cool the prechamber 2 and the fuel injector holes 11, and in the design process, the shape of the cooling water jacket 3, the water flow and the flow rate of the cooling water are optimized according to the temperatures of different working conditions in the prechamber 2 and the main combustion chamber 4, so as to ensure that the working temperatures of the prechamber 2 and the main combustion chamber 4 are within a reasonable range, and the shape and the appearance of the cooling water jacket 3 are not limited to the structural form in the drawings, and can be adjusted according to actual conditions.

Preferably, the cylinder head structure further comprises an electronic water pump and an ECU controller, wherein the electronic water pump and the ECU controller are used for controlling water flow in the cooling water jacket 3, the water flow of a cooling water channel of the cylinder head body 1 can be controlled according to the working condition of an engine, the working temperature of the precombustion chamber 2 is guaranteed to be controlled in a reasonable range all the time, the situation that the surface temperature of the precombustion chamber 2 is too low to be too low and flame quenching is generated is avoided, and the situation that a hot spot is formed under the working condition of large load and abnormal combustion is caused is also avoided.

In the cylinder head structure provided by the embodiment, since the prechamber 2 is formed by the machined stepped hole on the cylinder head body 1, the distance from the lower end of the prechamber 2 to the main combustion chamber 4 (i.e. the wall thickness of the prechamber 2) can be processed to be about 3mm, which is convenient for the high-temperature gas in the prechamber 2 to rapidly enter the main combustion chamber 4. In addition, the appearance of the precombustion chamber 2 can be combined with the whole structure of the cylinder cover to carry out optimization design, and in the design process, the strength, water flow, temperature field and the like of the precombustion chamber 2 and the cylinder cover body 1 are optimized and improved through CFD and CAE calculation for many times, and are tested and verified.

The embodiment also provides a gasoline engine, and this gasoline engine includes above-mentioned cylinder head structure, through setting up cylinder head body 1 and precombustion chamber 2 to the integral type structure, can save the assembly space of precombustion chamber 2, realizes the compact of cylinder head structure and arranges to realize gasoline engine's miniaturization.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. A cylinder head structure characterized by comprising:

a cylinder head body (1);

a pre-combustion chamber (2) which is arranged on the cylinder head body (1), wherein the pre-combustion chamber (2) and the cylinder head body (1) are of an integrated structure;

a cooling water jacket (3) provided on the cylinder head body (1), the cooling water jacket (3) being used for cooling the prechamber (2).

2. The cylinder head structure according to claim 1, characterized in that the cylinder head body (1) is made by casting.

3. The cylinder head structure according to claim 2, wherein a stepped hole is provided in the cylinder head body (1), a small end of the stepped hole forms the pre-chamber (2), a spark plug (5) is accommodated in the pre-chamber (2), and a large end of the stepped hole is used for connecting an ignition coil, and the ignition coil is connected with the spark plug (5).

4. The cylinder head structure according to claim 1, characterized in that the bottom of the prechamber (2) is provided with injection holes (21), which injection holes (21) are configured to communicate with the main combustion chamber (4).

5. The cylinder head structure according to claim 4, characterized in that the number of the injection holes (21) is plural, and the plural injection holes (21) are provided at intervals along the bottom of the precombustion chamber (2).

6. The cylinder head structure according to claim 4, characterized in that an injector hole (12) is further provided in the cylinder head body (1), the injector hole (12) communicating with the main combustion chamber (4).

7. A cylinder head structure according to claim 1, characterized in that a fuel injector hole (11) is also provided on the cylinder head body (1), the fuel injector hole (11) communicating with the pre-chamber (2).

8. The cylinder head structure according to claim 1, characterized in that the cooling water jacket (3) includes a water inlet and a water outlet that communicate with a cooling water passage of the cylinder head body (1).

9. The cylinder head structure according to claim 8, further comprising an electronic water pump and an ECU controller for controlling water flow in the cooling water jacket (3).

10. A gasoline engine characterized by comprising the cylinder head structure according to any one of claims 1 to 9.