Internal-combustion engines – Means to whirl fluid before – upon – or after entry into... – Having multiple oxidant inlet means
Reexamination Certificate
1999-09-13
2001-06-26
Solis, Erick (Department: 3747)
Internal-combustion engines
Means to whirl fluid before, upon, or after entry into...
Having multiple oxidant inlet means
C123S188140
Reexamination Certificate
active
06250281
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The present invention relates to a direct intake port and a helical intake port both used for various kinds of engines such as a diesel engine, a gasoline engine or a gas engine.
2. Preamble Structure
The direct intake port for an engine according to the present invention is directed to those each of which has the following preamble structure, for example, as shown in FIG.
1
(A) to FIG.
1
(E) (present invention) or FIG.
8
(A) to FIG.
8
(C) (prior art).
FIG.
1
(A) to FIG.
1
(E) show a direct double intake port for an engine according to the present invention. FIG.
1
(A) is a cross sectional plan view. FIG.
1
(B) is a vertical sectional front view of a first direct intake port
2
A. FIG.
1
(C) is a sectional view taken along a line C—C in FIG.
1
(B). FIG.
1
(D) is a vertical sectional front view of a second direct intake port
2
B. FIG.
1
(E) is a sectional view taken along a line E—E in FIG.
1
(D).
FIG.
8
(A) to FIG.
8
(C) show a conventional direct double intake port for an engine. FIG.
8
(A) is a cross sectional plan view. FIG.
8
(B) is a vertical sectional front view of a first intake port
102
A. FIG.
8
(C) is a vertical sectional front view of a second intake port
102
B.
An engine has a cylinder head
1
,
101
provided with a direct intake port
2
,
102
. This direct intake port
2
,
102
is formed by communicating a port inlet
3
,
103
with a port outlet
7
,
107
through a port upstream portion
4
,
104
, a port bent portion
5
,
105
and a port downstream portion
6
,
106
in order. This port outlet
7
,
107
is opened at a position eccentric from a cylinder axis
10
,
110
of an upper end surface
9
,
109
of a cylinder chamber
8
,
108
.
3. Prior Art
FIG.
8
(A) to FIG.
8
(C) show an example of conventional shapes of the bent portion
105
of the direct intake port
102
in the preamble structure.
FIG.
8
(A) to FIG.
8
(C) illustrate a conventional direct double intake port for a vertical diesel engine. FIG.
8
(A) is a cross sectional plan view. FIG.
8
(B) is a vertical sectional front view of a first intake port
102
A. FIG.
8
(C) is a vertical sectional front view of a second intake port
102
B.
The bent portion
105
is formed so as to only smoothly continue the upstream portion
104
with the downstream portion
106
. Therefore, it flows an intake air current (A) from the upstream portion (
104
) to the downstream portion (
106
) smoothly.
The prior art has the following problems.
As is well known, the direct intake port is formed by putting importance on the increase of volumetric efficiency. Accordingly, there is produced insufficient swirl within the cylinder chamber
108
, which results in a disadvantage of failing to mix air with fuel satisfactorily.
The smoothly continued shape of the bent portion
105
of the conventional direct intake port
102
shown in FIG.
8
(A) to FIG.
8
(C) cannot improve the disadvantage of producing insufficient swirl the direct intake port
2
has by nature
SUMMARY OF THE INVENTION
The present invention has the following objects:
1. To improve the disadvantage of producing insufficient swirl the direct intake port has by nature, through devising the shape of the bent portion of the direct intake port, thereby enhancing the mixing efficiency of air with fuel and eventually promoting the engine's high output, low fuel consumption and reduction of unburnt poisonous substances (such as carbon monoxide, hydrocarbon and particulate) contained in the exhaust gas; and
2. To further strengthen the swirl force the helical intake port has by nature, through devising the shape of the bent portion of the helical intake port, thereby more enhancing the mixing efficiency of air with fuel and further promoting the engine's high output, low fuel consumption and reduction of unburnt poisonous substances (such as carbon monoxide, hydrocarbon and particulate) contained in the exhaust gas.
A direct intake port for an engine according to each of a 1st to a 9th aspects of the present invention is characterized by adding to the above-mentioned preamble structure the following features for the shape of the bent portion
5
of the direct intake port
2
, for example, as shown in FIG.
1
(A) to FIG.
1
(E), and
FIGS. 2
to
4
so as to solve the foregoing problems.
FIG.
1
(A) to FIG.
1
(E) show a direct double intake port for a vertical diesel engine according to a first embodiment of the present invention. FIG.
1
(A) is a cross sectional plan view. FIG.
1
(B) is a vertical sectional front view of a first direct intake port
2
A. FIG.
1
(C) is a sectional view taken along a line C—C in FIG.
1
(B). FIG.
1
(D) is a vertical sectional front view of a second direct intake port
2
B. FIG.
1
(E) is a sectional view taken along a line E—E in FIG.
1
(D).
FIG. 2
is a perspective view of the direct double intake port of FIG.
1
(A) to FIG.
1
(E).
FIG. 3
is a perspective view of the first direct intake port
2
A shown in FIG.
1
(A) to FIG.
1
(E).
FIG. 4
is a perspective view of the second direct intake port
2
B shown in FIG.
1
(A) to FIG.
1
(E).
According to a first aspect of the present invention, an entire peripheral surface of the bent portion
5
has a peripheral side surface portion
11
close to the cylinder axis
10
, which provides a means (S) for deviating an intake air current (A) far away from the cylinder axis
10
.
The means (S) is formed so as to turn a direction of the intake air current (A) which flows from the upstream portion
4
to the downstream portion
6
, from the peripheral side surface portion
11
toward an opposite peripheral side surface portion
13
situated far away from the cylinder axis
10
.
According to a second aspect of the present invention, the entire peripheral surface of the bent portion
5
has a peripheral side surface portion
14
close to the upper end surface
9
of the cylinder chamber
8
, which provides a means (T) for deviating the intake air current (A) far way from the upper end surface
9
of the cylinder chamber
8
.
This means (T) is formed so as to turn the direction of the intake air current (A) which flows from the upstream portion
4
to the downstream portion
6
, from the peripheral side surface portion
14
to an opposite peripheral side surface portion
16
situated far away from the upper end surface
9
of the cylinder chamber
8
.
A third aspect of the present invention is a combination of the first aspect and the second aspect.
More specifically, the entire peripheral surface of the bent portion
5
has the peripheral side surface portion
11
close to the cylinder axis
10
, which provides the means (S) for deviating the intake air current (A) far away from the cylinder axis
10
.
This means (S) is formed so as to turn the direction of the intake air current (A) which flows from the upstream portion
4
to the downstream portion
6
, from the peripheral side surface portion
11
toward the opposite peripheral side surface portion
13
situated far away from the cylinder axis
10
.
The entire peripheral surface of the bent portion
5
has the peripheral side surface portion
14
close to the upper end surface
9
of the cylinder chamber
8
, which provides the means (T) for deviating the intake air current (A) far away from the upper end surface
9
of the cylinder chamber
8
.
This means (T) is formed so as to turn the direction of the intake air current (A) which flows from the upstream portion
4
to the downstream portion
6
, from the peripheral side surface portion
14
close to the upper end surface
9
of the cylinder chamber
8
toward the opposite peripheral side surface portion
16
situated far away from the upper end surface
9
of the cylinder chamber
8
.
A fourth aspect of the present invention is made by further adding the following construction to the direct intake port according to the first or the third aspect.
The means (S) comprises a projection
12
for deviating the intake air current (A) far away from the cylinder axis
10
.
A fifth aspect of the pr
Hagiwara Masayuki
Hataura Kiyoshi
Imai Takatoshi
Miyazaki Manabu
Suzuki Hiroshi
Bacon & Thomas PLLC
Kubota Corporation
Solis Erick
LandOfFree
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