Internal-combustion engines – Combustion chamber means having fuel injection only – Injected fuel spraying into whirling fluid
Reexamination Certificate
2002-03-19
2003-11-18
Solis, Erick (Department: 3747)
Internal-combustion engines
Combustion chamber means having fuel injection only
Injected fuel spraying into whirling fluid
C123S305000, C123S14500A
Reexamination Certificate
active
06647951
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a direct-injection type diesel engine and more particularly to an engine which can prevent overheat of a glow plug.
2. Description of Prior Art
There is a conventional engine which comprises a cylinder head with a fuel injection nozzle and a glow plug attached thereto like the present invention, as a direct-injection type diesel engine.
However, the conventional type of engine has a glow plug extending through an exhaust port wall portion.
According to the conventional technique, exhaust air passing through an exhaust port has its heat easily transmitted to the glow plug with the result of readily overheating the glow plug.
SUMMARY OF THE INVENTION
The present invention has an object to provide a direct-injection type diesel engine capable of solving the foregoing problem.
The contents of the present invention is as follows.
It is a direct-injection type diesel engine, as shown in
FIG. 1
, which comprises a cylinder head
1
with a fuel injection nozzle
2
and a glow plug
3
attached thereto.
The fuel injection nozzle
2
has a leading end opposed to a cylinder mid portion
4
and the glow plug
3
extends through an intake port wall portion
6
between the fuel injection nozzle
2
and an intake port
5
. The glow plug
3
is inclined with respect to the fuel injection nozzle
2
by a predetermined angle (&thgr;
1
) and has a leading end inserted into the cylinder mid portion
4
.
The present invention offers the following effect.
“Effect 1” It is Possible to Inhibit the Overheat of the Glow Plug.
As shown in
FIG. 1
, the glow plug extends through the intake port wall portion
6
between the fuel injection nozzle
2
and the intake port
5
. Therefore, exhaust air passing through an exhaust port
11
has its heat hardly transmitted to the glow plug
3
. This results in the possibility of preventing the overheat of the glow plug
3
.
“Effect 2” It is Possible to Uniformly Heat a Combustion Chamber Over its Entirety.
As shown in
FIG. 1
, the glow plug
3
has its leading end inserted into the cylinder mid portion
4
with the result of being able to uniformly heat the whole combustion chamber.
“Effect 3” It is Easy to Insert the Glow Plug.
As shown in
FIG. 1
, the glow plug
3
is inclined with respect to the fuel injection nozzle
2
. Therefore, it is possible to insert the leading end of the glow plug
3
into the cylinder mid portion
4
without causing the glow plug
3
to interfere with the fuel injection nozzle
2
. This makes it easy to insert the glow plug
3
.
“Effect 4” A Swirl is Strengthened in the Combustion Chamber.
As shown in
FIG. 1
, in the case of forming a wedge-like port portion
5
a
which increase its width toward intake valve ports
10
a
,
10
b,
intake air passing through the intake port
5
is strongly pushed into the intake valve ports
10
a
,
10
b
as shown in
FIG. 2
, while being pressed to an opposite wall
8
a
in the wedge-like port portion
5
a
. This allows high-speed intake air to flow into an inner peripheral surface side portion of a cylinder
21
to result in strengthening the swirl within the cylinder
21
.
“Effect 5” It is Possible to Inhibit the Overheat of the Fuel Injection Nozzle.
As shown in
FIGS. 1 and 2
, the intake port wall portion
6
is projected to provide a nozzle boss
6
a
through which the fuel injection nozzle
2
is inserted. This arrangement makes it hard for the heat of the exhaust air passing through the exhaust port
11
to be transmitted. Thus it is possible to prevent the overheat of the fuel injection nozzle
2
.
“Effect 6” The Overheat of the Glow Plug is Inhibited.
As shown in
FIG. 2
, the intake port wall portion
6
through which the glow plug
3
extends opposes to an inter-port transverse water passage
12
. This arrangement inhibits the overheat of the glow plug
3
.
“Effect 7” Intake Air is Filled With a High Efficiency.
As shown in
FIG. 2
, cooling water which passes through the inter-port transverse water passage
12
is arranged to flow from the intake air distributing means
13
to the exhaust air converging means
14
. This arrangement makes it hard for the exhaust air heat to be transmitted to the intake air distributing means and can prohibit the intake air from increasing its temperature. Thus intake air is filled with a high efficiency.
“Effect 8” It is Possible to Inhibit Leakage of the Glow Plug.
As shown in
FIG. 1
, the glow plug
3
has a terminal projected out of the head cover
15
. This arrangement removes a likelihood that condensed water, oil mist and the like within the head cover
15
adhere to the terminal, with the result of being able to inhibit the leakage of the glow plug
3
.
“Effect 9” It is Possible to Secure a Large Volume of a Breather Chamber.
As shown in
FIG. 5
, when seen in a direction parallel with the cylinder center axis
7
, the intake port wall portion
6
through which the glow plug
3
extends is displaced in a direction opposite to a direction in which the breather chamber
20
is deviated from a center axis
17
of a crank shaft. Owing to this arrangement, the breather chamber
20
can expand into the direction opposite to the deviated direction without being interrupted by the glow plug
3
which extends through the head cover
15
. This results in the possibility of securing a large volume of the breather chamber
20
.
REFERENCES:
patent: 5676107 (1997-10-01), Yuzuriha et al.
patent: 5927246 (1999-07-01), Occella et al.
patent: 5964196 (1999-10-01), Sigle et al.
patent: 6065437 (2000-05-01), Kleinschmidt
patent: 6105553 (2000-08-01), Polach
Aketa Masahiro
Iwanaga Wataru
Shiraishi Yasunori
Umeda Yuzo
Bacon & Thomas PLLC
Kubota Corporation
Solis Erick
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