Direct injection spark-ignited internal combustion engine

Details Direct injection spark-ignited internal combustion engine Direct injection spark-ignited internal combustion engine

1999-12-09

2001-07-17

Kamen, Noah P. (Department: 3747)

Internal-combustion engines

Cooling

With jacketed head and/or cylinder

C123S305000

Reexamination Certificate

active

06260518

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a direct injection spark-ignited internal combustion engine, and more particularly to a direct injection spark-ignited internal combustion engine with improved cooling performance of a fuel injection valve.
In a direct injection spark-ignited internal combustion engine, if the heat radiation performance of the fuel injection valve is poor, the fuel injection valve will rise to a high temperature. If this occurs, volatile components of fuel that has become attached to the high-temperature fuel injection valve evaporate before the fuel is ignited and their remaining gum components are carbonized by the heat so that they remain as deposits. In such a case, it becomes difficult to achieve a highly precise fuel injection and this interferes with stable fuel combustion.
In the Japanese laid-open patent application publication H9-119344, there is a disclosure of a cooling structure for a fuel injection valve in which a depression formed at the bottom surface of a cylinder block and a cooling water path are communicated with each other through a communication path.
SUMMARY OF THE INVENTION
According to an investigation by the inventor, a cooling structure for a fuel injection valve can be described as shown in FIG.
4
.
In the cylinder head
101
shown in
FIG. 4
, a fuel combustion chamber
102
is formed by a depression in the center of the bottom surface of the head
101
, and a spark plug mounting hole
103
having a centerline IGCL is formed at a position in proximity to the center of the fuel combustion chamber
102
, into which is mounted a spark plug (not shown in the drawing).
The cylinder head
101
has an intake port
104
formed on the centerline IPCL and an exhaust port
105
formed on the centerline EPCL, these communicating with the fuel combustion chamber
102
, so as to surround the spark plug mounting hole
103
, an intake valve and an exhaust valve (neither shown in the drawing) being mounted to each of these apertures leading to the fuel combustion chamber. Two each of intake ports
104
and exhaust ports
105
are provided.
Between and below the two intake ports
104
of the cylinder head
101
(on the outer periphery of the fuel combustion chamber
102
), is formed a fuel injection valve mounting hole
108
on the centerline FICL, into which is mounted a fuel injection valve (not shown in the drawing). The fuel injection valve injects fuel directly into the fuel combustion chamber
102
.
As a cooling structure for cooling the fuel injection valve, a part of the cooling water path
109
disposed at the bottom of the spark plug mounting hole
103
is provided with a cooling water path expanded part
110
formed on the fuel injection valve mounting hole
108
side, and a first and second lower cooling water path
111
and
112
disposed on the bottom of the fuel injection valve.
The above-noted cooling water expanded part
110
and the first lower cooling water path
111
are formed by means of a sand core, and the second lower cooling water path
112
provided as a depression in the bottom surface of the cylinder head
101
is formed by a casting hollow.
In the above-noted cooling structure for a fuel injection valve, however, because of the casting hollow formed by the protrusion in the sand mold, it is necessary to provide a depression in the bottom surface of the cylinder head
101
, and it is necessary to maintain a wall thickness of at least approximately 4 mm to achieve accurate casting of the cylinder head. This causes the fuel injection valve and cooling water to be at a distance from each other, so that it is not possible to achieve effective cooling of the fuel injection valve or, more specifically, cooling of the gas seal portion between the fuel injection valve and the cylinder head, thereby leaving room for improvement in the related art.
Accordingly, in consideration of the above-noted investigation, it is an object of the present invention to provide a direct injection spark-ignited internal combustion engine in which the gas seal portion between the fuel injection valve and the cylinder head is effectively cooled, thereby preventing the deposits from forming on the nozzle of the fuel injection valve, and enabling highly precise fuel injection.
In order to achieve the above-noted object, a direct injection spark-ignited internal combustion engine according to the present invention has a fuel injection valve that injects fuel directly into a fuel combustion chamber and is provided to a cylinder head, a fuel injection valve gasket that is inserted between the cylinder head and the fuel injection valve, and a water hole that is formed in a cylinder head gasket near the fuel injection valve gasket. Here, the fuel injection valve is cooled through a seal portion of the fuel injection valve gasket, by cooling water in contact with the bottom surface of the cylinder head through the water hole.
Stated in other terms, a direct injection spark-ignited internal combustion engine according to the present invention has a cylinder head, a cylinder block, a gas seal portion disposed between the cylinder head and the cylinder block, fuel injection means, provided to the cylinder head, for injecting fuel directly into a fuel combustion chamber, and cooling means for cooling the fuel injection means. Here, the cooling means has a water hole formed in the gas seal portion near the fuel injection means, and cooling water in contact with the cylinder head through the water hole acts to cool the fuel injection means.


REFERENCES:
patent: 5799627 (1998-09-01), Dohn et al.
patent: 5983843 (1999-11-01), Suzuki et al.
patent: 9-119344 (1997-05-01), None
patent: 11-182330 (1999-07-01), None

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