CN209959346U

CN209959346U - Combustion chamber of gasoline direct injection engine

Info

Publication number: CN209959346U
Application number: CN201920646775.4U
Authority: CN
Inventors: 黄忠文; 黄勇; 彭友成; 张振培; 覃瑞森
Original assignee: SAIC Automotive Transmission Liuzhou Co Ltd
Current assignee: Liuzhou Saike Technology Development Co Ltd
Priority date: 2019-05-07
Filing date: 2019-05-07
Publication date: 2020-01-17
Anticipated expiration: 2029-05-07

Abstract

The utility model is suitable for an automobile engine technical field provides a direct injection gasoline engine combustion chamber in jar, and this combustion chamber is the combustion chamber body that comprises combustion chamber top surface, combustion chamber bottom surface and combustion chamber wall face, the combustion chamber top surface is equipped with the arch, protruding one side is equipped with the intake duct, be equipped with the (air) intake valve on the intake duct, protruding opposite side be equipped with the exhaust passage of intake duct symmetry, be equipped with the exhaust valve on the exhaust passage, the fore-and-aft direction at protruding top is equipped with sprayer and spark plug respectively, the combustion chamber bottom surface inside is equipped with the recess, the combustion chamber bottom surface outside is equipped with at least one guiding gutter. Implement the utility model discloses a gasoline direct injection engine combustion chamber has following beneficial effect: the oil bundles are reduced from colliding the wall, the oil-gas mixing effect is improved, the combustion efficiency is improved, the emission is reduced, and the required cost is reduced.

Description

Combustion chamber of gasoline direct injection engine

Technical Field

The utility model belongs to the technical field of automobile engine, especially, relate to a direct injection gasoline engine combustion chamber.

Background

The direct injection gasoline engine in the cylinder can accurately control the fuel injection quantity in the cylinder of the automobile engine, effectively control the fuel-air mixing process in the cylinder, and improve the dynamic property and fuel economy of the engine, and is a hotspot and mainstream technology developed by gasoline engines at present. Because the GDI engine directly injects fuel into the cylinder, the phenomena of obvious oil bundle wall collision condition and local uneven mixing exist, and the particle emission level is higher; the tumble level in the cylinder is weaker, the combustion efficiency is low, the oil consumption is higher, and the required combustion cost is higher.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a gasoline engine combustion chamber is directly spouted in jar aims at solving the current gasoline engine combustion chamber's oil beam and bumps the wall situation obvious, the poor granule emission level of oil-gas mixture effect is higher, combustion efficiency is low and required combustion cost is higher problem.

The utility model discloses a realize like this, a gasoline engine combustion chamber is directly spouted to jar, this combustion chamber is the combustion chamber body that comprises combustion chamber top surface, combustion chamber bottom surface and combustion chamber wall face, the combustion chamber top surface is equipped with the arch, protruding one side is equipped with the intake duct, be equipped with the (air) intake valve on the intake duct, protruding opposite side be equipped with the exhaust passage of intake duct symmetry, be equipped with the exhaust valve on the exhaust passage, the fore-and-aft direction at protruding top is equipped with sprayer and spark plug respectively, the combustion chamber bottom surface inside is equipped with the recess, the combustion chamber bottom surface outside is equipped with at least one guiding gutter.

The utility model discloses a further technical scheme is: the protrusion is of a trapezoidal structure, and the included angle between two inclined sides of the trapezoid is 130 degrees.

The utility model discloses a further technical scheme is: the fuel injector is vertically arranged on the top of the protrusion, and the central axis of the fuel injector is parallel to the central axis of the combustion chamber.

The utility model discloses a further technical scheme is: the guiding gutter deepens gradually from bottom to top and in the direction close to the wall surface of the combustion chamber.

The utility model discloses a further technical scheme is: the flow guide grooves are 4 and are uniformly distributed on the periphery of the bottom surface of the combustion chamber.

The utility model discloses a further technical scheme is: the included angle between the bevel edge plane of the diversion trench and the bottom surface of the combustion chamber is 25 degrees.

The utility model discloses a further technical scheme is: the installation portion plane of spark plug is to the combustion chamber body is sunken in, just the central line bottom of spark plug is partial to the sprayer, and this installation portion plane is with the horizontal plane contained angle of combustion chamber top surface is 18.5.

The utility model discloses a further technical scheme is: the front and back directions of the bottom surface of the combustion chamber are both arc-shaped structures.

The utility model discloses a further technical scheme is: and the oil injector and the spark plug are positioned between the air inlet channel and the exhaust channel.

The utility model has the advantages that: the combustion chamber of the gasoline direct injection engine is provided with a bulge at the top of the combustion chamber, a groove at the inner side of the bottom surface of the combustion chamber and a diversion trench at the outer side of the bottom surface of the combustion chamber; when air enters the combustion chamber from the upper part of the inlet valve, the protruding structure at the top of the combustion chamber can guide the air flow at the position, the air flow is guided to the diversion trench at the bottom of the combustion chamber, and the air flow rolls upwards in the groove at the bottom of the combustion chamber through the diversion trench to form tumble flow. The bottom plane of the combustion chamber is concave downward, and the edge of the groove forms an air squeezing surface, so that the gas is inhibited from entering the cylinder and flowing along the radial direction. The gas in the cylinder flows more orderly, so that the formation of tumble flow is facilitated, the collision of oil bundles on the wall is reduced, and the oil-gas mixing effect is improved; the large-scale tumble in the cylinder is broken into small-scale vortexes near the top dead center of the compression stroke, so that the turbulence intensity in the cylinder near the top dead center of the compression stroke is increased, the combustion efficiency is improved, the emission is reduced, and the required cost is reduced.

Drawings

FIG. 1 is a schematic view of a front three-dimensional structure of a combustion chamber of a gasoline direct injection engine provided in an embodiment of the present invention;

FIG. 2 is a schematic view of a bottom surface three-dimensional structure of a combustion chamber of a gasoline direct injection engine provided in an embodiment of the present invention;

FIG. 3 is a front-rear direction central plane sectional view of a combustion chamber of a gasoline direct injection engine provided in an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a central plane of a combustion chamber of a gasoline direct injection engine according to an embodiment of the present invention;

fig. 5 is a sectional view of the central plane of the intake and exhaust valves of the combustion chamber of the gasoline direct injection engine provided by the embodiment of the present invention.

The names of the components in the figure are as follows:

1-a combustion chamber top surface; 2-combustion chamber bottom surface; 3-combustion chamber wall surface; 4-bulge; 5, an air inlet channel; 6-an inlet valve; 7-an exhaust passage; 8-an exhaust valve; 9-oil injector; 10-a spark plug; 11-a groove; 12-diversion trench.

Detailed Description

The embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 1-5, a direct injection gasoline engine combustion chamber in this embodiment, this combustion chamber is the combustion chamber body that comprises combustion chamber top surface 1, combustion chamber bottom surface 2 and combustion chamber wall 3, combustion chamber top surface 1 is equipped with arch 4, arch 4 one side is equipped with intake duct 5, be equipped with intake valve 6 on intake duct 5, arch 4 opposite side be equipped with the exhaust passage 7 of intake duct 5 symmetry, be equipped with exhaust valve 8 on the exhaust passage 7, the fore-and-aft direction at arch 4 top is equipped with sprayer 9 and spark plug 10 respectively, 2 inboards in combustion chamber bottom surface are equipped with

recess

11, 2 outsides in combustion chamber bottom surface are equipped with at least one guiding gutter 12. That is, in the present embodiment, the injector 9 and the ignition plug 10 are located between the intake passage 5 and the exhaust passage 7, and the guiding groove 12 communicates with the inside of the combustion chamber of the direct injection gasoline engine, which is formed by the combustion chamber top protrusion 4, the groove 11 inside the combustion chamber bottom surface 2, and the guiding groove 12 outside the combustion chamber bottom surface 2; when air enters, air flow enters the combustion chamber from the upper part of the air inlet valve 6, the structure of the bulge 4 at the top of the combustion chamber can guide the air flow at the position, the air flow is guided to the guide groove 12 at the bottom of the combustion chamber, and the air flow rolls upwards in the groove 11 at the bottom of the combustion chamber through the guide groove 12 to form rolling flow. The bottom plane of the combustion chamber is concave downward, and the edge of the groove 11 forms an air squeezing surface, so that the air is inhibited from entering the cylinder and flowing along the radial direction. The gas in the cylinder flows more orderly, so that the formation of tumble flow is facilitated, the collision of oil bundles on the wall is reduced, and the oil-gas mixing effect is improved; the large-scale tumble in the cylinder is broken into small-scale vortexes near the top dead center of the compression stroke, so that the turbulence intensity in the cylinder near the top dead center of the compression stroke is increased, the combustion efficiency is improved, the emission is reduced, and the required cost is reduced.

In this embodiment, the protrusion 4 is a trapezoid structure, and an included angle between two oblique sides of the trapezoid is 130 °; the fuel injector 9 is vertically arranged on the top of the bulge 4, and the central axis of the fuel injector 9 is parallel to the central axis of the combustion chamber. That is, in this embodiment, the combustion chamber bottom surface 2 is in an arc shape in the front-rear direction, so as to reduce the intake resistance; the bulge 4 is of a trapezoidal structure and can guide air inlet and strengthen the formation of tumble; the vertical installation of the fuel injector 9 reduces the impact of the oil bundles on the wall.

In this embodiment, the guiding grooves 12 are gradually deepened from bottom to top and in a direction close to the wall surface 3 of the combustion chamber; 4 flow guide grooves 12 are uniformly distributed on the periphery of the bottom surface 2 of the combustion chamber; the inclined plane of the diversion trench 12 and the combustion chamber bottom surface 2 form an included angle of 25 degrees. That is to say, in this embodiment, the arrangement of the diversion trench 12 can guide the entering airflow, so as to reduce the collision of the oil bundles against the wall and improve the oil-gas mixing effect.

In this embodiment, the mounting plane of the spark plug 10 is recessed into the combustion chamber body, the bottom end of the center line of the spark plug 10 is biased toward the fuel injector 9, and the included angle between the mounting plane and the horizontal plane of the combustion chamber top surface 1 is 18.5 °; this arrangement may promote propagation of the flame after ignition.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides an in-cylinder direct injection gasoline engine combustion chamber, this combustion chamber is the combustion chamber body that constitutes by combustion chamber top surface, combustion chamber bottom surface and combustion chamber wall, its characterized in that: the combustion chamber top surface is equipped with the arch, protruding one side is equipped with the intake duct, be equipped with the (air) intake valve on the intake duct, protruding opposite side be equipped with the exhaust passage of intake duct symmetry, be equipped with the exhaust valve on the exhaust passage, the fore-and-aft direction at protruding top is equipped with sprayer and spark plug respectively, the combustion chamber bottom surface inside is equipped with the recess, the combustion chamber bottom surface outside is equipped with at least one guiding gutter.

2. The combustion chamber of a gasoline direct injection engine as set forth in claim 1, wherein said projection has a trapezoidal configuration, and the angle between the inclined sides of said trapezoidal configuration is 130 °.

3. The combustion chamber of a gasoline direct injection engine according to claim 2, characterized in that the injector is mounted vertically on the convex tip, the injector center axis being parallel to the combustion chamber center axis.

4. The combustion chamber of a gasoline direct injection engine according to claim 1, wherein the guide groove is gradually deepened from bottom to top in a direction approaching the wall surface of the combustion chamber.

5. The combustion chamber of a gasoline direct injection engine as set forth in claim 4, wherein said number of flow guide grooves is 4 and is uniformly distributed around the bottom surface of said combustion chamber.

6. The combustion chamber of a gasoline direct injection engine as set forth in claim 4 wherein the angle between the hypotenuse plane of the channel and the bottom surface of the combustion chamber is 25 °.

7. The combustion chamber of a gasoline direct injection engine according to claim 1, characterized in that a mounting plane of the ignition plug is recessed in the combustion chamber body, and a bottom end of a center line of the ignition plug is biased toward the injector, and an angle of the mounting plane with respect to a horizontal plane of the top surface of the combustion chamber is 18.5 °.

8. The combustion chamber of a gasoline direct injection engine according to claim 1, wherein the combustion chamber has a circular arc-shaped bottom surface in both the front and rear directions.

9. The combustion chamber of a gasoline direct injection engine according to claim 1, characterized in that the injector and the ignition plug are located between the intake passage and the exhaust passage.