Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Reexamination Certificate
1998-09-29
2001-10-09
Jenkins, Daniel J. (Department: 1742)
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
C419S011000, C419S037000
Reexamination Certificate
active
06299664
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of manufacturing a sliding part, and a vortex flow generator for an injection valve manufactured by that method.
2. Description of the Related Art
FIG. 2
is a sectional view showing a fuel injection valve
1
for injecting a fuel into a cylinder (hereafter referred to simply as the injection valve, when applicable), and FIG.
3
A and
FIG. 3B
are a sectional view and a plane view, each showing a vortex member (a sliding part or a vortex flow generator)
13
incorporated in a valve device
3
of the injection valve
1
.
As shown in
FIG. 2
, the injection valve
1
includes a housing main body
2
, and the valve device
3
fixed to one end of the housing main body
2
by caulking or the like and covered by a sleeve
35
. A fuel supply tube
4
is connected to the other end of the housing main body
2
so that a high pressure fuel is supplied from the fuel supply tube
4
through a fuel filter
37
to the injection valve
1
.
The housing main body
2
includes a first housing
30
having a flange
30
a
through which the injection valve
1
is mounted onto a cylinder head (not shown) of an internal combustion engine, and a second housing
40
onto which a solenoid device
50
is mounted. The solenoid device
50
has a bobbin
52
on which a coil
51
is wound, and a core
53
installed in an inner circumferential portion of the bobbin
52
. A winding of the coil
51
is connected to a terminal
56
. The core
53
is formed into such a hollow cylindrical shape so as to define a fuel passage therein. A spring
55
is provided in the hollow portion of the core
53
and compressed between an adjuster
54
and a needle valve
12
. An armature
31
is attached integrally to the other end of the needle valve
12
to confront with the leading end of the core
53
. The intermediate portion of the needle valve
12
is formed to have a guide
12
a
for slidingly guiding the valve
12
along the inner circumferential surface of a valve main body
9
, and a needle flange
12
b
contacted with a spacer
32
installed in the first housing
30
. The housing main body
2
and the sleeve
35
cooperatively constitute a housing of the injection valve
1
.
The first housing
30
, the core
53
and the armature
31
are made of magnetic material, such as an electromagnetic stainless, to form a magnetic circuit.
The valve device
3
includes the valve main body
9
, a valve seat
11
, the needle valve
12
and the vortex member
13
. The valve main body
9
is formed into a stepped hollow cylindrical shape, which has a central hole
9
a
axially-slidably and concentrically supporting the needle valve
12
while circumscribing the guide
12
a
of the same, and an accommodation hole
9
b
formed by enlarging the diameter of the leading end side of the central hole
9
a
for accommodating the valve seat
11
and the vortex member
13
therein. The valve seat
11
has a fuel injection hole
1
at its center, and is fixedly provided within the accommodation hole
9
b
of the valve body
9
. The needle valve
12
is brought into and out of contact with the valve seat
11
by the solenoid device
50
to close and open a fuel injection hole
10
. The vortex member
13
serves as the sliding member for guiding the needle valve
12
in an axial direction, and applying a vortex motion to the fuel before the fuel flows into the fuel injection hole
10
of the valve seat
11
radially inwardly.
A structure of the vortex member
13
will be described in detail with reference to
FIGS. 3A and 3B
.
The vortex member
13
is substantially in the form of a hollow cylindrical shape, which has a central hole
15
concentrically and axially-slidably supporting the needle valve
12
while surrounding the same. The vortex member
13
has a first end face
16
to be contacted with the valve seat
11
, a second end face
17
opposite from the valve seat
11
, and a periphery
18
contacted with the inner circumferential surface of the accommodation hole
9
b
of the valve main body
9
, when assembled into the valve device
3
.
The second end face
17
of the vortex member
13
is contacted with and supported by a stepped portion
9
c
of the accommodation hole
9
b
of the valve main body
9
, is formed with passage grooves
17
a
each extended radially to allow the fuel to flow from the inner circumferential portion of the second end face
17
to the outer circumferential portion thereof. The periphery
18
of the vortex member
13
is formed with a large number of planar surfaces, which are provided at constant angular intervals in the circumferential direction and extends in the axial direction. More specifically, the periphery
18
is formed with a plurality of outer peripheral portions
18
a
in contact with the inner circumferential portion of the accommodation hole
9
b
of the valve main body
9
for regulating the relative position of the vortex member
13
to with respect to the valve main body
9
, and flow passage portions
18
b
each of which is in the form of a planar surface located between adjacent two outer peripheral portions
18
a
and defines an axial flow passage for the fuel in cooperation with the inner circumferential surface of the accommodation hole
9
b.
Provided in the first end face
16
of the vortex member
13
are an inner circumferential annular groove
16
a,
which has a predetermined width and is formed in the inner circumferential portion adjacent to the central hole
15
, and vortex grooves
16
b
each of which extends substantially radially inwardly so that one end thereof is connected to the flow passage portion
18
b
of the periphery
18
whereas the other end thereof is connected to the inner circumferential annular groove
16
a
in a tangential direction.
This valve device
3
is assembled as follows: The vortex member
13
is inserted into the accommodation hole
9
b
through one end of the valve main body
9
, then the valve seat
11
is pressure-inserted into the accommodation hole
9
b
through the one end of the valve main body
9
and thereafter the valve main body
9
and the valve seat
11
are welded together for integration in an airtight manner. Further, the needle valve
12
is inserted into the central hole
9
b
through the other end of the valve main body
9
so that the leading end of the needle valve
12
is inserted into the central hole
15
.
In the valve device
3
, the needle valve
12
is reciprocally moved in the axial direction by the action of the solenoid device
50
such that the guide
12
a
is slide along the inner circumferential surface of the central hole
9
a
of the valve main body
9
and the leading end side of the needle valve
12
is slide along the inner circumferential surface of the central hole
15
. The fuel injection hole
10
is closed when the leading end of the needle valve
12
is seated on the valve seat
11
. During the opening of the fuel injection hole
10
, the fuel passes through the passage grooves
17
a
to flow between the inner circumferential surface of the accommodation hole
9
b
and the flow passage portions
18
b,
and then passes through the vortex grooves
16
b
to flow into the inner circumferential annular grooves
16
a
in the tangential directions, thereby forming the vortex flow entering into the fuel injection hole
10
and dispersed from the leading end outlet thereof.
The injection valve
1
thus constructed is mounted in such a manner than the leading end thereof is inserted into an injection valve insertion hole (not shown) provided in the cylinder head, a depressing metal is applied to the flange
30
downwardly, and the depressing metal is fixedly tightened to the cylinder head with mounting bolts (not shown). Here, a planar washer or a corrugated washer is interposed between the injection valve
1
and the cylinder head, and the axial depressing force by the depressing metal ensures the sealing between the injection valve
1
and the cylinder head. In addition, the fuel supply tube
4
is fixed such that it
Aota Masayuki
Kasai Takao
Kohyama Takuro
Matsumoto Osamu
Munezane Tsuyoshi
Jenkins Daniel J.
Mitsubishi Denki & Kabushiki Kaisha
Sughrue Mion Zinn Macpeak & Seas, PLLC
LandOfFree
Method of manufacturing sliding part and vortex flow... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of manufacturing sliding part and vortex flow..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of manufacturing sliding part and vortex flow... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2553574