CN212927995U

CN212927995U - Novel high-efficiency ignition engine

Info

Publication number: CN212927995U
Application number: CN202021400724.2U
Authority: CN
Inventors: 李伟; 吴学成
Original assignee: AVL List Technical Center Shanghai Co Ltd
Current assignee: AVL List Technical Center Shanghai Co Ltd
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2021-04-09
Anticipated expiration: 2030-07-16

Abstract

The utility model discloses a belong to engine technical field, specifically be a novel high efficiency spark-ignition engine, contain: the four-valve cylinder cover is internally cast and integrated with two vortex air inlet channels; the mixed gas ignition mechanism in the cylinder is composed of double spark plugs; the combustion chamber is composed of a cylinder body, a piston, a four-valve cylinder cover, an intake valve and an exhaust valve, and two independent vortex air passages are designed, so that the flow interference of two air flows in the air passages is avoided, the air inflow directions of the two air passages rotate along the inner wall of the cylinder and are mutually enhanced, the combustion chamber at the top of the piston adopts a cylindrical or conical protruding structure, the vortex strength can be kept to the maximum extent in the compression stroke process of an engine while a higher compression ratio is maintained, a double-spark plug ignition system is arranged aiming at the combustion chamber, the flame propagation distance after ignition is shortened, the ignition duration is shortened, and the thermal efficiency is improved.

Description

Novel high-efficiency ignition engine

Technical Field

The utility model relates to the technical field of engines, specifically a novel high efficiency spark-ignition engine.

Background

The fuel consumption rate is an important index for examining an automobile engine, and during the ignition work-doing process of the engine, the air flow in a combustion chamber can be optimized, the intake vortex can be increased, so that fuel oil and air are fully mixed, and the condition of complete combustion of mixed gas is met as far as possible so as to achieve higher heat efficiency.

According to the traditional flowing mode of mixed gas tumble of the ignition type engine, more in-cylinder vortex is utilized to form stronger airflow to flow, so that the mixed gas in the cylinder is uniformly distributed, but the potential for improving the in-cylinder tumble strength is limited, the flame propagation speed is limited after ignition is further accelerated, and the heat efficiency of the engine is improved to a limited extent.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a novel high efficiency spark-ignition engine to solve the traditional spark-ignition engine that proposes in the above-mentioned background art and adopt the problem that organizing the in-cylinder tumble mixed gas technique and can not reach higher thermal efficiency.

In order to achieve the above object, the utility model provides a following technical scheme: a novel high efficiency spark-ignition engine comprising:

the four-valve cylinder cover is internally cast and integrated with two vortex air inlet channels;

the mixed gas ignition mechanism in the cylinder is composed of double spark plugs;

the combustion chamber is composed of a cylinder body, a piston, a four-valve cylinder cover, an intake valve and an exhaust valve component.

Preferably, two the vortex intake duct contains an outer vortex intake duct and an interior vortex intake duct, outer vortex intake duct, interior vortex intake duct connect combustion chamber to air intake manifold and constitute engine air intake passage.

Preferably, two the vortex intake duct is the disconnect-type and arranges, gets gas from intake manifold respectively, and two vortex intake ducts admit air respectively, have avoided the air current to interfere.

Preferably, the central angles of the parts of the two swirl inlet channels close to the cylinder hole are arranged at a difference of 90 °.

Preferably, the direction of the inlet air of the two vortex air inlet channels when entering the cylinder hole is tangent to the wall surface of the cylinder hole.

Preferably, the double spark plugs are arranged on the edge of the combustion chamber in the four-valve cylinder cover and are respectively positioned between the intake valve and the exhaust valve on the two sides, and the ignition position point of the double spark plugs is positioned in the middle of a gap between the top surface of the piston and the cylinder cover surface at the time of the top dead center of the piston.

Preferably, the top combustion chamber profile of the piston is a top combustion chamber profile, the top combustion chamber profile is cylindrical or conical, and a smooth shape in which a projection in the middle of the top combustion chamber profile is transited to an external recess is matched with the circular cylinder.

Preferably, the bottom of the piston is designed to be convex towards the top of the piston from the center so as to increase the heat dissipation area, and the profile curve of the bottom of the piston is close to the inflow and outflow angles of fluid, so that the oil beam of the cooling nozzle of the piston is close to the wall surface of the bottom of the piston to flow and cool the central area.

Preferably, two vortex air inlet channels are utilized, the outer vortex air inlet channel generates an outer vortex which extends the motion of the cylinder wall, the inner vortex air inlet channel generates an inner vortex which is close to the profile of the top combustion chamber, the outer vortex and the inner vortex force air inlet to form a strong vortex around the center of the cylinder hole in the cylinder of the engine, the air flow speed is high, and the oil and gas are uniformly mixed.

The novel high-efficiency ignition engine is a single-cylinder or multi-cylinder ignition engine.

Compared with the prior art, the beneficial effects of the utility model are that:

1) through the integrated double vortex intake duct in the cylinder cap, the air current gets into the angular difference 90 of cylinder in the air flue, and the angle of admitting air of two air flues is tangent with the cylinder hole wall respectively for the process of admitting air forms controllable regular vortex around cylinder hole center promptly. The design of the two independent vortex air passages ensures that air inlet is not interfered, the disturbance of two air flows in the cylinder is reduced, and the air inlet flow direction rotates along the inner wall of the cylinder and is mutually enhanced;

2) the piston top structure is a raised cylindrical structure or a cone structure, the strength of the vortex is enhanced when the piston moves downwards during the air intake stroke, the strength of the vortex is maintained when the piston moves upwards during the compression stroke, and the flowing speed of the mixed gas in the cylinder under the low-rotating-speed working condition of the engine is further improved. And the piston combustion chamber has simple structure and good manufacturability, the middle protruding part of the piston adopts a hollow structure, and the structure has a guiding effect on the engine oil sprayed by the piston cooling nozzle, thereby improving the cooling function of the piston. The complex and high-cost inner cooling oil passage of the traditional engine piston can be replaced. The piston is more reliable in a high-temperature, high-speed and high-strength operating environment;

3) the ignition system with the double spark plugs is adaptively matched with a four-valve structure, the ignition point positions are definitely arranged, the flame propagation distance after ignition is shortened, the ignition duration is shortened, and the heat efficiency is improved.

Drawings

Fig. 1 is an overall layout diagram of the present invention;

FIG. 2 is a view showing the layout of the internal components of the present invention;

FIG. 3 is a schematic top view of the intake flow direction of the internal and external vortex air ducts of the present invention;

FIG. 4 is a schematic structural view of the outer vortex air intake duct and the inner vortex air intake duct of the present invention;

FIG. 5 is a schematic view of the sectional structure of the piston of the present invention

FIG. 6 is a front view, sectional view and a schematic flow direction of the oil jet of the piston cooling nozzle of the present invention;

fig. 7 is a schematic view of the upward air intake flow of the piston of the present invention.

In the figure: the engine comprises a four-valve cylinder cover 1, a cylinder body 2, an intake valve 3, an exhaust valve 4, an external vortex air inlet channel 7, an internal vortex air inlet channel 8, a piston 10, a top combustion chamber profile 11, a double-spark plug 12, a direct injection oil injector 13 and a piston cooling nozzle 14.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Example (b):

referring to fig. 1-7, the present invention provides a technical solution: a novel high efficiency spark-ignition engine comprising:

the four-valve cylinder cover 1 is characterized in that two vortex air inlet channels are cast and integrated in the four-valve cylinder cover 1;

an in-cylinder mixture ignition mechanism composed of double spark plugs 12;

the combustion chamber is composed of a cylinder body 2, a piston 10, a four-valve cylinder cover 1, an intake valve 3 and an exhaust valve 4.

Further, two the vortex intake duct contains an outer vortex intake duct 7 and an interior vortex intake duct 8, outer vortex intake duct 7, interior vortex intake duct 8 connect the combustion chamber to intake manifold and constitute engine air intake passage.

Furthermore, two the vortex intake duct is the disconnect-type and arranges, gets gas from intake manifold respectively, and two vortex intake ducts admit air respectively, have avoided the air current to interfere.

Further, the central angles of the parts of the two vortex air inlets close to the cylinder hole are arranged at a 90-degree difference.

Furthermore, the direction of the inlet airflow of the two vortex air inlet channels entering the cylinder hole is tangent to the wall surface of the cylinder hole.

Further, the double spark plugs 12 are arranged on the edge of a combustion chamber in the four-valve cylinder cover 1 and are respectively positioned between the intake valve 3 and the exhaust valve 4 on the two sides, and the ignition position points of the double spark plugs 12 are positioned in the middle of the gap between the top surface of the piston 10 and the cylinder cover surface at the top dead center of the piston 10.

Further, the top combustion chamber profile of the piston 10 is a top combustion chamber profile 11, the top combustion chamber profile 11 is cylindrical or conical, and a smooth shape in which a middle protrusion of the top combustion chamber profile 11 is transited to an outer recess is matched with a circular cylinder.

Further, the bottom of the piston 10 is shaped to be convex with its center protruding toward the top of the piston 10 to increase the heat dissipation area, and the bottom profile curve of the piston 10 is close to the inflow and outflow angles of the fluid, so that the oil beam of the piston cooling nozzle 14 is close to the wall surface of the bottom of the piston 10 to flow and cool the central area.

Further, by utilizing the two vortex air inlet channels, the outer vortex air inlet channel 7 generates an outer vortex which extends the motion of the cylinder wall, the inner vortex air inlet channel 8 generates an inner vortex which is close to the top combustion chamber profile 11 of the top combustion chamber profile, the outer vortex and the inner vortex force air inlet to form a strong vortex around the center of the cylinder hole in the cylinder of the engine, the air flow speed is high, and the oil and gas are uniformly mixed.

Fig. 1 and 2 show the overall layout of the present example, which includes: an outer vortex air inlet channel 7, an inner vortex air inlet channel 8, an air inlet valve 3 and an air outlet valve 4 are cast inside the four-valve cylinder cover 1, the middle areas of the air inlet valve 3 and the air outlet valve 4 on two sides are respectively provided with double spark plugs 12, an ignition point is positioned at the top dead center moment of a piston 10, and the middle position between the top surface of the piston 10 and the four-valve cylinder cover 1. Wherein, the four-valve cylinder cover 1, the inlet valve 3, the exhaust valve 4 and the piston 10 form an engine combustion chamber together.

Fig. 3 and 4 show a separated double-vortex air inlet channel applied in this example, which is divided into an outer vortex air inlet channel 7 and an inner vortex air inlet channel 8, the angle of the air flow direction entering the cylinder hole at the air inlet tail end is different by 90 degrees, and the air inlet angles of the double-vortex air inlet channels are respectively tangent to the wall surface of the cylinder hole;

fig. 5 and 6 show a structure diagram of a piston 10 applied in this example, the top of the piston 10 adopts a top combustion chamber profile 11 in a nearly cylindrical shape, which is in smooth transition with a rim plane, and the bottom is in a dome structure, and a cooling oil beam ejected from a piston cooling nozzle 14 can flow and cool close to a wall surface, so that the cooling efficiency is higher. The piston 10 is simple in overall structure and good in manufacturability, is integrally formed by die casting, and does not need to be subjected to secondary processing in a combustion chamber. The top combustion chamber profile 11, which is the top combustion chamber profile, cooperates with the four valve cylinder head 1 combustion chamber to force the in-cylinder air flow to form a strong vortex rotating around the cylinder bore centerline during the upward travel of the piston 10, as shown in fig. 6.

The fuel injection system employed in this example is direct in-cylinder injection.

In actual implementation, direct fuel injector 13 can adopt the intake duct injection mode in the jar, equally can with the utility model relates to an other system match, reach the effect that improves the thermal efficiency of burning.

By arranging two separated vortex air inlets, the air inlet angles of the two vortex air passages are designed to be different by 90 degrees and respectively cling to the wall surface of a cylinder hole to inlet air, so that the air inlet vortex strength is greatly enhanced in an air inlet stroke; the piston 10 is designed as a swirl enhanced outer swirl piston, maintaining a high compression ratio while maintaining maximum swirl strength during the compression stroke of the engine. Even at the end of compression, a strong swirl strength remains in the cylinder. The gas-oil mixing in the combustion chamber is more sufficient, and the flame propagation speed is greatly increased in the moment of ignition. Short mixture combustion duration; the piston 10 cavity is provided with a cooling oil deflector structure that increases the cooling capacity of the piston 10, allowing the piston 10 to operate in higher heat load environments. Meanwhile, a double-spark-plug ignition system is arranged aiming at the combustion chamber with the four-valve structure, so that the propagation distance of flame in a cylinder is reduced in the ignition working stroke of the engine, and the combustion duration of mixed gas is further shortened. The combustion heat efficiency of the engine is improved, and the oil consumption is reduced.

Having shown and described the basic principles and principal features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A novel high efficiency spark ignition engine, comprising:

the four-valve cylinder cover (1), wherein two vortex air inlet channels are cast and integrated in the four-valve cylinder cover (1);

an in-cylinder mixture ignition mechanism composed of double spark plugs (12);

the combustion chamber is composed of a cylinder body (2), a piston (10), a four-valve cylinder cover (1), an intake valve (3) and an exhaust valve (4).

2. The new high efficiency spark ignition engine of claim 1 wherein: two the vortex intake duct contains an outer vortex intake duct (7) and an interior vortex air intake duct (8), outer vortex intake duct (7), interior vortex air intake duct (8) are connected the combustion chamber and are constituted engine air intake passage to air intake manifold.

3. The new high efficiency spark ignition engine of claim 1 wherein: two the vortex intake duct is the disconnect-type and arranges, gets gas from intake manifold respectively, and two vortex intake ducts admit air respectively, have avoided the air current to interfere.

4. The new high efficiency spark ignition engine of claim 1 wherein: the central angles of the parts of the two vortex air inlets close to the cylinder hole are arranged with a 90-degree difference.

5. The new high efficiency spark ignition engine of claim 1 wherein: and the direction of the inlet airflow of the two vortex air inlet channels when entering the cylinder hole is tangent to the wall surface of the cylinder hole.

6. The new high efficiency spark ignition engine of claim 1 wherein: the double spark plugs (12) are arranged on the edge of a combustion chamber in the four-valve cylinder cover (1) and are respectively positioned between an intake valve (3) and an exhaust valve (4) on two sides, and the ignition position points of the double spark plugs (12) are positioned in the middle of a gap between the top surface of the piston (10) and the cylinder cover surface at the top dead center moment of the piston (10).

7. The new high efficiency spark ignition engine of claim 1 wherein: the top combustion chamber profile of piston (10) is top combustion chamber profile (11), top combustion chamber profile (11) are the cylinder type or the circular cone type, protruding transition is followed the shape and is cooperated with circular cylinder to the sunken fairing outside in the middle of top combustion chamber profile (11).

8. The new high efficiency spark ignition engine of claim 7 wherein: the bottom shape of the piston (10) is designed to be that the center protrudes towards the top direction of the piston (10) so as to increase the heat dissipation area, and the profile curve of the bottom of the piston (10) is close to the inflow and outflow angles of fluid, so that the oil beam of the piston cooling nozzle (14) is close to the wall surface of the bottom surface of the piston (10) to flow and cool the central area.

9. The new high efficiency spark ignition engine of claim 1 wherein: utilize two vortex intake ducts, outer vortex intake duct (7) produce the outside vortex of extending the cylinder wall motion, and interior vortex intake duct (8) produce the inboard vortex of pressing close to top combustion chamber profile (11), and outside vortex and inboard vortex force admit air and form the strong vortex around cylinder hole center in engine cylinder, and the air current velocity of flow is fast, oil-gas mixture is even.

10. The new high efficiency spark ignition engine of claim 1 wherein: the novel high-efficiency ignition engine is a single-cylinder or multi-cylinder ignition engine.