JPH10339246A - Intake structure of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve operation performance and exhaust gas by forming a heat radiation plate in the stem part of an intake valve exposed in an intake port. SOLUTION: With a technical base of the intake structure of an internal combustion engine, in which an injector 9 for fuel spray faces to an intake valve in an intake port 15, fuel atomization is promoted by applying fuel spray to the heat radiation plate 10 attached to an intake valve 3, and an auxiliary air passage 4 is provided in a cylinder head 1, and the auxiliary air passage 4 forces gas flow in a low load area and recovers the reduction of air by the heat radiation plate 10 in a high load area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake structure of an internal combustion engine, which can effectively prevent operability from deteriorating due to droplets of fuel spray and deterioration of exhaust gas.

[0002]

2. Description of the Related Art As a conventional intake structure of an internal combustion engine, for example, one disclosed in Japanese Utility Model Laid-Open Publication No. 6-43226 is known. In this intake structure, as shown in FIG. 5, a cover 11 is fixed around the intake valve 3 so as to make the directionality of gas flow and the directionality of fuel constant. In FIG. 1, reference numeral 1 denotes a cylinder head, reference numeral 2 denotes a spark plug, reference numeral 6 denotes a piston, and reference numeral 15 denotes an intake port.

[0003]

However, in such a conventional intake structure of an internal combustion engine, since the structure is not such that the fuel spray is atomized, the fuel is accumulated in the portion of the cover 11. Since the liquid fuel flows into the combustion chamber, there is a problem that the driving performance deteriorates and the exhaust gas deteriorates.

The present invention has been made in view of the above situation, and an object of the present invention is to improve a driving performance by forming a radiator plate on a stem portion of an intake valve exposed in an intake port. Accordingly, it is an object of the present invention to provide an intake structure of an internal combustion engine capable of improving exhaust gas.

[0005]

In order to achieve the above object, the present invention is based on the technical premise of an intake structure of an internal combustion engine in which a fuel spray injector faces an intake valve in an intake port. Atomization of fuel is promoted by applying fuel spray to a radiator plate attached to the intake valve, and an auxiliary air passage is provided in the cylinder head.The auxiliary air passage enhances gas flow in a low load region, In a high-load region, a configuration is provided in which the reduction in the amount of air due to the heat sink is recovered.

According to the present invention, the radiator plate of the intake valve is configured such that when the intake valve is opened, the fuel jet dew rebounds in the direction of the ignition plug, thereby enriching the mixture around the ignition plug.

In this case, the radiator plate of the intake valve is formed in a spiral shape, and atomized while rotating by spraying a fuel spray on the radiator plate. Alternatively, the radiator plate is formed in a bowl shape. It is desirable to atomize the heat radiation plate by spraying the fuel spray and repelling the heat radiation plate toward the intake port upstream side.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments of the invention shown in the accompanying drawings.

FIG. 1 shows a first embodiment of the present invention. In this embodiment, reference numeral 1 denotes a cylinder head, reference numeral 2 denotes a spark plug, reference numeral 3 denotes an intake valve, and FIG.
Reference numeral 4 denotes an auxiliary air passage, reference numeral 5 denotes an auxiliary air passage hose, reference numeral 6 denotes a piston, reference numeral 7 denotes a throttle valve, reference numeral 9 denotes a fuel spray injector, reference numeral 10 denotes a heat sink, and reference numeral 15 denotes intake air. Reference numeral 16 denotes a port, and reference numeral 16 denotes a combustion chamber.

The auxiliary air passage 4 is formed in the cylinder head 1 and is connected to an upstream side of the throttle valve 7 through an auxiliary air passage hose 5. The intake valve 3 is mounted downstream of the fuel spray injector 9 in the injection direction, and a radiator plate 10 is fixed to a stem portion of the intake valve 3.

In the intake structure of the internal combustion engine thus configured, the fuel injected from the fuel spray injector 9 is fixed to the stem of the intake valve 3 in order to promote the vaporization of the fuel spray. After colliding with the projecting portion of the radiator plate 10, the fuel jet dew diffuses into the combustion chamber 16, so that it does not accumulate as a liquid in the lower portion of the intake port 15 and can promote the vaporization of the fuel. In this embodiment, the manufacturing cost can be reduced because the shape is simple.

FIG. 2 shows a second embodiment of the present invention. In this embodiment, instead of providing the heat radiating plate 10 on the stem portion of the intake valve 3 of the first embodiment, a fuel reflecting plate 12 is fixed. When the intake valve 3 is opened, the fuel injected and discharged
It is possible to make the mixture directly around the ignition plug 2 to enrich the mixture around the ignition plug 2, so that it is possible to effectively prevent deterioration in operability and exhaust gas, and to operate with a thin mixture. Is possible, so that fuel efficiency can be improved.

FIG. 3 shows a third embodiment of the present invention. In this embodiment, a radiating plate 13 formed in a spiral shape is used instead of the radiating plate 10 of the first embodiment. The fuel vaporization can be promoted by spraying the fuel spray on the spiral radiator plate 13. Further, in this embodiment, the same effect can be obtained even when the valve is turned.

FIG. 4 shows a fourth embodiment of the present invention. In this embodiment, instead of the radiator plate 10 of the first embodiment, a radiator plate 14 formed in a bowl shape is replaced by a stem of the intake valve 3. By spraying the fuel spray on the bowl-shaped radiator plate 14, the sprayed fuel is repelled to the upstream side of the intake port 15, and the vaporization of the fuel can be promoted.
The gas flow in the intake port 15 can be used effectively.

[0015]

As described above, according to the intake structure for an internal combustion engine according to the present invention, since the radiator plate is provided on the stem portion of the intake valve exposed in the intake port, fuel spray is applied to the radiator plate. Since the fuel collides and scatters in the combustion chamber, it is possible to promote the vaporization of the spray fuel, improve the driving performance, and improve the exhaust gas.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing an intake structure of an internal combustion engine according to a first embodiment of the present invention.

FIG. 2 is a front sectional view showing an intake structure of an internal combustion engine according to a second embodiment of the present invention.

FIG. 3 is a front sectional view showing an intake structure of an internal combustion engine according to a third embodiment of the present invention.

FIG. 4 is a front sectional view showing an intake structure of an internal combustion engine according to a fourth embodiment of the present invention.

FIG. 5 is a front sectional view showing an intake structure of an internal combustion engine in which a conventional intake valve is covered.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Spark plug 4 Auxiliary air passage 6 Piston 15 Intake port 16 Combustion chamber

Claims (4)

[Claims] In an intake structure of an internal combustion engine in which a fuel spray injector faces an intake valve in an intake port, atomization of fuel is promoted by applying fuel spray to a radiator plate attached to the intake valve. At the same time, an auxiliary air passage is provided in the cylinder head, and the auxiliary air passage is configured to enhance the flow of gas in a low load region, and to recover a decrease in the amount of air due to the radiator plate in a high load region. Characteristic intake structure of internal combustion engine. 2. The heat radiation plate of the intake valve is configured such that when the intake valve is opened, fuel jet dew rebounds in the direction of the ignition plug, thereby enriching the mixture around the ignition plug. Item 2. An intake structure for an internal combustion engine according to item 1. 3. The radiator plate of the intake valve is formed in a spiral shape,
3. The intake structure for an internal combustion engine according to claim 2, wherein the heat radiating plate is atomized while being sprayed with fuel spray. 4. The internal combustion engine according to claim 2, wherein the heat radiation plate of the intake valve is formed in a bowl shape, and the fuel spray is applied to the heat radiation plate to bounce back to the intake port upstream side to atomize. Intake structure.