Fluid sprinkling – spraying – and diffusing – Flow deflecting or rotation controlling means – Fluid rotation inducing means upstream of outlet
Reexamination Certificate
1999-10-07
2001-01-09
Morris, Lesley D. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Flow deflecting or rotation controlling means
Fluid rotation inducing means upstream of outlet
C239S533120, C239S585400
Reexamination Certificate
active
06170762
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cylinder injection type fuel injection valve to be used in a cylinder injection type internal combustion engine (four-cycle engine or two-cycle engine) that gives swirling energy to fuel streams by a swirling device and injects the fuel from a fuel injection nozzle directly into a combustion chamber, in particular a fuel injection valve appropriate to fuel injection with a small angle of spray from the injection nozzle.
2. Discussion of Background
Heretofore, there has been an internal combustion engine wherein premixed combustion is carried out at a high output and stratified combustion is carried out at a low output, and that the premixed combustion and the stratified combustion are switched in accordance with the operational conditions of the engine as disclosed in WO96-36808. Such an internal combustion engine can optimize the shape of a combustion chamber, an air streaming method, the position of a fuel injection valve, characteristics of the spray, the position of an ignition plug and other factors in order to meet incompatible requirements of improvement in output and improvement in mileage.
However, when such an internal combustion engine is used for, e.g., an automobile, the optimization of these factors can not be realized in all cases since there are various limitations based on the system or the specifications of the engine, parts for induction and exhaust systems, the layout of parts for a fuel system and the appearance of the vehicle.
Unless there is adopted a method wherein improvement in output is compatible with improvement in mileage with existing techniques and facilities utilized, the production cost is raised, making the business unprofitable.
Under the circumstances, one of the most important technical issues is that premixed combustion and stratified combustion are compatible. In order to make the two combustion concepts compatible, the shape of a combustion chamber, an air streaming method, the position of a fuel injection valve, the characteristics of spray, the position of an ignition plug become relevant as stated earlier. It is fundamental that homogenous mixture is created by diffused spray in premixed combustion and that converged spray is collected in the vicinity of an ignition plug in stratified combustion.
Various kinds of investigations have been conducted about the research on new peripheral parts for a fuel system, system concepts for a fuel system or a combustion system, control methods and other issues in order to realize the technical issue stated earlier while minimizing the increase in cost with existing techniques, facilities and parts utilized.
In order to explain the basic structure of such a cylinder injection type fuel injection valve, the fuel injection valve that has been disclosed in JP-A-1047208 will be explained as a conventional fuel injection valve.
In
FIG. 6
is shown a cross-sectional side view of the entire structure of the cylinder injection type fuel injection valve
1
disclosed in the publication. The cylinder injection type fuel injection valve
1
comprises a main housing
2
, and a valve unit
3
fixed to an end of the main housing
2
by, e.g., caulking and covered by a holder
35
. The main housing
2
has the other end connected to a fuel supply pipe
4
, from which fuel is supplied, at a high pressure, into the cylinder injection type fuel injection valve
1
through a fuel filter
57
. The cylinder injection type fuel injection valve
1
has a leading portion inserted into an inserting port
6
of a cylinder head
5
in an internal combustion engine and sealed by, e.g., a wave washer
60
or a similar member.
The valve unit
3
includes a valve body
9
formed in a stepped hollow cylindrical shape so as to have a small diameter of cylindrical portion
7
and a large diameter of cylindrical portion
8
, a valve seat
11
fixed to a leading edge of a central hole in the valve body
9
and having a fuel injection nozzle
10
formed therein, a needle valve
12
as a valve-closure member to be moved away from and toward the valve seat
11
by a solenoid unit
50
stated later on to open and close the fuel injection nozzle
10
, a swirler
13
for guiding the needle valve
12
in an axial direction and for radially and inwardly giving swirling movement to the fuel before the fuel enters the injection nozzle
10
. The valve body
9
of the valve unit
3
and the main housing
2
provide the cylinder injection type fuel injection valve
1
with a total housing.
The main housing
2
includes a first housing
30
having a flange
30
a
for mounting the cylinder injection type fuel injection valve
1
to the cylinder head
5
, and a second housing
40
with the solenoid unit
50
mounted thereon. The solenoid unit
50
includes a bobbin
52
with a coil
51
wound thereon and a core
53
provided at an inner peripheral portion of the bobbin
52
. The coil
51
is connected to a terminal
56
. The core
53
is formed in a hollow cylinder shape to provide a fuel passage therein. The core
53
has a spring
55
provided between a sleeve
54
and the needle valve
12
in the hollow portion thereof.
The needle valve
12
has an end remote from the valve seat
11
provided with a movable armature
31
so as to confront a leading edge of the core
53
. The needle valve
12
has an intermediate portion thereof provided with a guide
12
a
for slidably guiding the needle valve
12
along an inner peripheral surface of the valve unit
9
, and a needle flange
12
b
in contact with a spacer
32
provided in the first housing
30
.
In
FIG. 7
is shown a front view of the swirler
13
as viewed from the side of the valve seat
11
. In
FIGS. 8 and 9
are shown an enlarged cross-sectional side view and an exploded perspective view of the valve seat of the valve unit
3
and its surroundings. As shown in these Figures, the swirler
13
of the valve unit
3
is a hollow member formed in a substantially cylindrical shape, which has a central hole
15
formed therein so as to surround the needle valve
12
as the valve-closure member at the center and to slidably support the needle valve in the axial direction. The swirler includes a first end surface
16
and a second end surface
17
. When the swirler is assembled into the valve unit
3
, the first end surface contacts the valve seat
12
and the second end surface is located on the side remote from the valve seat
11
. The swirler has an outer circumferential surface
19
extended between both end surfaces so as to partly contact the inner peripheral surface
18
of the valve body
9
as a part of the hollow total housing.
The second end surface
17
of the swirler
13
has peripheral portions contacted with and supported by a shoulder
20
provided on the inner peripheral surface
18
of the valve body
9
. The second end surface has grooved passages
21
radially formed thereon to flow the fuel from an inner periphery to an outer periphery of the second end surface.
The outer circumferential surface
19
of the swirler
13
has a plurality of flat surfaces formed thereon so as to be separated one another at equal intervals in the circumferential direction and to extend in the axial direction. Thus, a plurality of outer peripheral surface portions
19
a
that contact the inner peripheral surface
18
of the valve body
9
to define the position of the swirler
13
to the valve body
9
, and flow passage portions
19
b
that are flat surfaces provided between adjacent outer peripheral surface portions to form axial passages
22
for the fuel between the inner peripheral surface
18
and the flat surfaces are provided on the outer circumferential surface
19
.
On the first end surface
16
as an axial end surface of the swirler
13
confronting the valve seat
11
, an inner annular groove
24
is provided at an inner periphery close to the central hole
15
of the first end surface
16
so as to have a certain width, and swirling grooves
25
are provided so that one end of each of the swirling
Fukutomi Norihisa
Sumida Mamoru
Mitsubishi Denki & Kabushiki Kaisha
Morris Lesley D.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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