In-cylinder fuel injection valve

Details In-cylinder fuel injection valve In-cylinder fuel injection valve

1999-09-21

2001-01-23

Kashnikow, Andres (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Including valve means in flow line

Reciprocating

C239S533120, C239S585400, C239S585500

Reexamination Certificate

active

06176441

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an in-cylinder fuel injection valve for directly injecting fuel into the combustion chamber of an internal combustion engine from an injection port by turning the fuel.
2. Description of the Prior Art
FIG. 8
is an axial direction sectional view showing a fuel injection valve disclosed by Japanese Laid-open Patent Application No. 2-215963, and
FIG. 9
is a perspective view showing a turning body in the fuel injection valve of FIG.
8
. In
FIG. 8
, reference numeral
51
denotes a valve housing,
52
a solenoid unit installed in the valve housing
51
,
53
the core of the solenoid unit
52
,
54
the electromagnetic coil of the solenoid unit
52
,
55
the plunger of the solenoid unit
52
,
56
the spring force control bar of the solenoid unit
52
,
57
the spring of the solenoid unit
52
,
58
the terminal of the solenoid unit
52
,
59
a valve unit attached to an end portion of the valve housing
51
in such a manner that it becomes coaxial to the solenoid unit
52
,
60
the valve body of the valve unit
59
,
61
the ball valve of the valve unit
59
,
62
a valve seat formed in the valve body
60
,
63
an injection port formed in the valve body
60
,
64
the turning body of the valve unit
59
,
65
a center hole formed in the turning body
64
to support the ball valve
61
so that it can move in an axial direction,
66
a vertical passage formed around the turning body
64
,
67
turning grooves formed in the valve body side of the turning body
64
,
68
a fuel supply hole formed in the valve housing
51
,
69
a fuel passage formed in a space between the valve housing
51
and the solenoid unit
52
, and
70
a fuel pipe fitted onto the valve housing
51
. In
FIG. 9
, the turning grooves
67
are connected to the injection port
63
eccentric to the center of the turning body
64
.
A description is subsequently given of the operation of the above prior art. Fuel is guided into the turning grooves
67
from the fuel pipe
70
through the fuel supply hole
68
, the fuel passage
69
and the vertical passage
66
. When electricity to be supplied from the terminal
58
to the electromagnetic coil
54
is cut, the plunger
55
is pressed by the spring force of the spring
57
, and the ball valve
61
contacts the valve seat
62
to stop a flow of fuel from the turning grooves
67
to the injection port
63
. When electricity is applied to the electromagnetic coil
54
from the terminal
58
while the valve unit
59
is thus closed by the spring force of the spring
57
, a magnetic circuit is formed by the electromagnetic coil
54
, the core
53
, the valve housing
51
and the plunger
55
, the plunger
55
and the ball valve
61
are magnetically attracted toward the core
53
side, and an annular space is formed between the ball valve
61
and the valve seat
62
. That is, when the valve unit
59
is opened by the electromagnetic attraction of the solenoid unit
52
, the annular space is formed between the ball valve
61
and the valve seat
62
and fuel is injected into the injection port
63
through the annular space from the turning grooves
67
. Since the turning grooves
67
are eccentric to the center of the turning body
64
, fuel turns along the lower peripheral surface of the ball valve
61
from the turning grooves
67
, passes through the annular space and is injected from the injection port
63
in a conical spray form having a predetermined angle.
FIG. 12
is an axial direction sectional view showing a in-cylinder fuel injection valve disclosed by Japanese Laid-open Patent Application No. 10-47208. In
FIG. 12
, reference numeral
1
denotes a first valve housing constituting a front half of a valve housing,
2
a second valve housing constituting a rear half of the valve housing and fixed coaxial to the rear end of the first valve housing
1
,
3
a valve unit installed in the first valve housing
1
,
4
a spacer set in the first valve housing
1
,
5
an internal passage formed in the spacer
4
,
6
a valve body installed in the first valve housing
1
,
7
an internal passage formed in the valve body
6
,
8
a storage chamber formed in the end portion of the valve body
6
such that it is coaxial to the internal passage
7
and having a diameter larger than that of the internal passage
7
,
9
a needle valve as a valve stored in the spacer
4
and the valve body
6
through the internal passage
7
in such a manner that it can move in an axial direction,
10
a holder connected to the outer side portion of the end of the first valve housing
1
to fix the spacer
4
and the valve body
6
to the first valve housing
1
,
11
the turning body of the valve unit
3
stored in the storage chamber
8
,
12
a center hole formed in the turning body
11
to support the needle valve
9
such that it can move in an axial direction,
13
a horizontal passage formed along the top surface of the turning body
11
,
14
a vertical passage formed around the turning body
11
,
15
an inner annular groove formed annular in the under surface of the turning body
11
outside the center hole
12
, and
16
turning grooves formed in the under surface of the turning body
11
such that they communicate with the vertical passage
14
and the inner annular groove
15
. The turning grooves
16
are connected to the inner annular groove
15
tangentially.
Denoted by
17
is a valve seat stored and fixed airtightly in the storage chamber
8
of the valve body
6
in such a manner that it is placed under the turning body
11
,
18
a valve seat surface formed on the top of the valve seat
17
,
19
an injection port formed in the center of the valve seat
18
coaxial to the valve seat
17
, and
20
a sealing member for the valve unit
3
fitted in a contact portion between the first valve housing
1
and the valve body
6
to prevent the leakage of fuel. Reference numeral
21
represents a solenoid unit installed in the first valve housing
1
and the second valve housing
2
such that it is coaxial to the valve unit
3
,
22
a core installed in the first valve housing
1
and the second valve housing
2
,
23
an internal passage formed in the core
22
,
24
a sleeve fitted in the core
22
at an intermediate portion of the internal passage
23
,
25
an internal passage formed in the sleeve
24
,
26
a bobbin installed in the first valve housing and fitted onto the end portion of the core
22
,
27
an electromagnetic coil fitted onto the bobbin
26
,
28
a sealing member fitted in contact portions among the first valve housing
1
, the core
22
and the bobbin
26
to prevent the leakage of fuel, and
29
an armature stored in the first valve housing
1
below the core
22
such that it can move an axial direction. The armature
29
supports the top portion of the needle valve
9
. Denoted by
30
is an internal passage formed around the armature
29
,
31
a spring inserted between the sleeve
24
and the armature
29
in the internal passage
23
,
32
a terminal connected to the electromagnetic coil
27
,
33
a filter installed in the internal passage
23
which is a fuel inlet portion,
34
a fuel pipe connected to the second valve housing
2
and the core
22
around the filter
33
, and
35
the cylinder block of an internal combustion engine equipped with an in-cylinder fuel injection valve.
The valve unit
3
comprises the spacer
4
, internal passage
5
, valve body
6
, internal passage
7
, storage chamber
8
, needle valve
9
, turning body
11
, center hole
12
, horizontal passage
13
, vertical passage
14
, inner annular groove
15
, turning grooves
16
, valve seat
17
, valve seat surface
18
and injection port
19
. The solenoid unit
21
comprises the core
22
, internal passage
23
, sleeve
24
, internal passage
25
, bobbin
26
, electromagnetic coil
27
, armature
29
, internal passage
30
, spring
31
and terminal
32
.
A description is subsequently given of the operation of the in-cylinder fuel injection valve shown in FIG.
12
. Fuel is guide

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