FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See section 10, Rule 13]
FUEL INJECTION VALVE
MITSUBISHI ELECTRIC CORPORATION, A CORPORATION ORGANISED AND
EXISTING UNDER THE LAWS OF JAPAN, WHOSE ADDRESS IS 7-3, MARUNOUCHI
2-CHOME, CHIYODA-KU, TOKYO 100-8310, JAPAN
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION
AND THE MANNER IN WHICH IT IS TO BE PERFORMED.
2
DOCUMENT NAME: DESCRIPTION
TECHNICAL FIELD
[0001]
The present application relates to fuel injection 5 valves for use
in fuel supply systems of internal combustion engines and, more
particularly, relates to an improvement in mounting performance.
BACKGROUND ART
[0002]
10 As is shown in Fig. 10 and Fig. 11, there is a conventional fuel
injection valve 1 which is attached in a hollow portion of, for
example, an engine head 2a serving as a mounting structure of an
internal combustion engine. A valve holder 4 is provided on the
downstream side of a housing 3 of the fuel injection valve 1 and
15 is arranged in the hollow portion of the engine head 2a. A valve
body 5 and a ball 6 provided on a downstream side end portion of
the valve body 5 are arranged in the hollow portion of the valve
holder 4. A valve seat 7 is provided on a downstream side end portion
of the inside of the valve holder 4; and the ball 6 of the valve
20 body 5 is connected to and disconnected from the valve seat 7.
[0003]
A seal system of, for example, the engine head 2a serving as the
mounting structure of the internal combustion engine is a type
(hereinafter, grommet type) in which fixing on the delivery side
25 is not needed and cost performance is excellent, a grommet 8 is
3
fitted together on the upstream side outer circumference of the
valve holder 4, and a crimp seal member having an upstream side
seal surface 9a and a downstream side seal surface 9b is used.
[0004]
Furthermore, as is shown in Fig. 12 and Fig. 5 13, there is other
conventional fuel injection valve 1 which is attached in a hollow
portion of, for example, an intake manifold 2b serving as the
mounting structure of the internal combustion engine. The
configuration of a valve holder 4 is similar.
10 [0005]
A seal system of, for example, the intake manifold 2b serving as
the mounting structure of the internal combustion engine is a type
(hereinafter, O-ring type) in which fixing on the delivery side
is needed, but a degree of freedom of mounting of the fuel injection
15 valve 1 is high, an O-ring 10 is fitted together on the outer
circumferential surface of a valve holder 4 so as to come in contact
with an upstream side seal surface 9a, a downstream side seal
positioning ring 11 is fitted together on the outer circumferential
surface of the valve holder 4 so as to come in contact with the
20 O-ring 10, and an annular seal member having a seal portion on the
inner circumferential side and the outer circumferential side is
used. These two seal systems are mainly adopted.
RELATED ART DOCUMENT
PATENT DOCUMENT
25 [0006]
4
Patent Document 1: JP,5006220,B
Patent Document 2: JP,3802702,B
SUMMARY OF THE INVENTION
PROBLEMS TO BE SOLVED BY THE INVENTION
5 [0007]
In the above-mentioned conventional fuel injection valve,
generally, a problem exists in that the fuel injection valve 1 is
difficult to have both seal structures and the shape of the fuel
injection valve 1 has to be changed for each seal type.
10 [0008]
Furthermore, the fuel injection valve 1 shown in Fig. 12 and Fig.
13 is one in which the grommet type is capable of changing to the
O-rig type by diverting the upstream side seal surface 9a of the
fuel injection valve 1 shown in Fig. 10 and Fig. 11 as the fixing
15 surface of the O-ring 10 and by attaching only the downstream side
seal positioning ring 11 afterwards, and the fuel injection valve
1 body is made common. However, in such a structure, a problem
exists in that the attachment position of the O-ring 10 is limited
to the upstream side seal surface 9a and accordingly a degree of
20 freedom of mounting layout disappears.
[0009]
Moreover, in the conventional fuel injection valve 1, an
attachment that seals at the upstream side seal surface 9a is
attached on the outer circumference of the valve holder 4 and this
25 attachment has the O-ring 10 and the upstream and downstream seal
5
positioning rings which fix the O-ring 10, whereby it becomes
possible that a degree of freedom of the mounting position of the
O-ring 10 is secured and the fuel injection valve 1 body is made
common (see drawings of Patent Document 1). However, in such a shape,
a problem exists in that the attachment is covered 5 on the outer
circumference of the valve holder 4 and accordingly a top end
diameter of the fuel injection valve 1 is enlarged, or a problem
exists in that a seal place is increased into two places of the
conventional grommet 8 and the O-ring 10 and accordingly management
10 cost is increased.
[0010]
Further, in the conventional fuel injection valve 1, there is one
in which the fuel injection valve 1 is made common and a degree
of freedom of the seal position of the O-ring 10 can also be secured
15 to some degree by respectively press-fitting the upstream and
downstream side seal positioning rings on the outer circumference
of the valve holder 4 from the top end (see Patent Document 2).
However, if the upstream side seal positioning ring is press-fitted
from the top end, contact wear is generated on the seal surface
20 of the O-ring 10 on the outer circumferential surface of the valve
holder 4. A problem exists in that there is a possibility that the
seal surface is damaged by the contact wear and the O-ring 10 is
cut after attachment.
[0011]
25 The present application discloses a technique which is for solving
6
the foregoing problem and an object of the present application is
to provide a fuel injection valve in which a seal structure or a
degree of freedom of a mounting position can be performed easily
and at low cost.
MEANS FOR SOLVING 5 THE PROBLEMS
[0012]
A fuel injection valve disclosed in the present application is
a fuel injection valve which includes: a valve holder arranged in
a housing; a valve body arranged inside the valve holder; and a
10 valve seat arranged on a downstream side end portion of the valve
body. Then, the fuel injection valve includes: an annular groove
formed on the outer circumferential surface of the valve holder;
an upstream side seal positioning ring which is arranged on the
outer circumferential surface of the valve holder in a loose-fit
15 state at the position of the annular groove, and in which a part
thereof is fitted together inside the annular groove by being
shrunken; an annular seal member which is inserted onto the outer
circumferential surface of the valve holder and is arranged below
the upstream side seal positioning ring; and a downstream side seal
20 positioning ring which is inserted onto the outer circumferential
surface of the valve holder and is arranged below the annular seal
member.
ADVANTAGEOUS EFFECT OF THE INVENTION
[0013]
25 According to the fuel injection valve disclosed in the present
7
application, the annular groove is formed on the outer
circumferential surface of the valve holder, the upstream side seal
positioning ring is arranged on the outer circumferential surface
of the valve holder in the loose-fit state at the position of the
annular groove, the upstream side seal positioning 5 ring is shrunken
and a part thereof is fitted together inside the annular groove,
the annular seal member is inserted below the upstream side seal
positioning ring on the outer circumferential surface of the valve
holder, and the downstream side seal positioning ring is inserted
10 below the annular seal member on the outer circumferential surface
of the valve holder, whereby the fuel injection valve body can be
made common and therefore there can be obtained the fuel injection
valve that can perform easily and at low cost.
BRIEF DESCRIPTION OF THE DRAWINGS
15 [0014]
Fig. 1 is a front view showing in a partial section a fuel
injection valve according to Embodiment 1;
Fig. 2 is a front view showing the fuel injection valve according
to Embodiment 1;
20 Fig. 3 is a sectional view taken along the line A-A of Fig. 2
showing a fuel injection valve according to Embodiment 2;
Fig. 4 is a front view showing a fuel injection valve according
to Embodiment 3;
Fig. 5 is a front view showing the fuel injection valve according
25 to Embodiment 3;
8
Fig. 6 is an enlarged front view showing a relevant part of the
fuel injection valve according to Embodiment 3;
Fig. 7 is a front view showing a fuel injection valve according
to Embodiment 4;
Fig. 8 is a front view showing a fuel injection 5 valve according
to Embodiment 5;
Fig. 9 is an enlarged front view showing a relevant part of a
fuel injection valve according to Embodiment 6;
Fig. 10 is a front view showing in a partial section a
10 conventional fuel injection valve;
Fig. 11 is a front view showing the conventional fuel injection
valve;
Fig. 12 is a front view showing in a partial section other
conventional fuel injection valve; and
15 Fig. 13 is a front view showing other conventional fuel injection
valve.
MODE FOR CARRYING OUT THE INVENTION
[0015]
Embodiment 1.
20 Fig. 1 is a front view showing in a partial section a fuel injection
valve according to Embodiment 1. Fig. 2 is a front view showing
the fuel injection valve according to Embodiment 1.
[0016]
In these drawings, a reference numeral 1 denotes a fuel injection
25 valve; 2b, for example, an intake manifold serving as a mounting
9
structure of an internal combustion engine; 3, a housing; 4, a thin
cylindrical shaped valve holder; 5, a valve body; 6, a ball; and
7, a valve seat.
[0017]
The fuel injection valve 1 is fitted together 5 by insertion in a
hollow-shaped insertion port formed in, for example, the intake
manifold 2b and injects fuel introduced from fuel piping to the
inside of the intake manifold 2b; and a seal structure which is
for maintaining airtight between the fuel injection valve 1 and
10 the intake manifold 2b is arranged.
[0018]
The fuel injection valve 1 includes: the valve holder 4 arranged
in the housing 3; the valve body 5 arranged inside the valve holder
4; the valve seat 7 arranged on a downstream side end portion of
15 the valve body 5; an annular groove 12 formed on the outer
circumferential surface of the valve holder 4; a resin-made upstream
side seal positioning ring 13 which is arranged on the outer
circumferential surface of the valve holder 4 in a loose-fit state
at the position of the annular groove 12, and in which a part thereof
20 is fitted together inside the annular groove 12 by being shrunken;
an annular seal member (hereinafter, referred to as "O-ring") 14
made by, for example, an O-ring which is inserted onto the outer
circumferential surface of the valve holder 4 and is arranged below
the upstream side seal positioning ring 13; and a downstream side
25 seal positioning ring 15 which is inserted onto the outer
10
circumferential surface of the valve holder 4 and is arranged below
the annular seal member 14. The annular seal member 14 made by the
O-ring has a seal portion on the inner circumferential side and
the outer circumferential side thereof.
5 [0019]
There may be selected shapes and the quality of the materials,
in which the upstream side seal positioning ring 13 can be inserted
without coming in contact with the seal surface of the outer
circumferential surface of the valve holder 4 and is capable of
10 being fixed in an interference-fit state to an outer circumferential
portion of the valve holder 4 at the vicinity of the annular groove
formed on the outer circumferential surface of the valve holder
4.
[0020]
15 More specifically, the dimensions thereof are set such that the
inner diameter of the upstream side seal positioning ring 13 is
smaller than the outer diameter of the valve holder 4 in a normal
temperature state and the inner diameter of the upstream side seal
positioning ring 13 is larger at a predetermined temperature or
20 more; and materials of the upstream side seal positioning ring 13
and the valve holder 4 may be selected such that the upstream side
seal positioning ring 13 and the valve holder 4 are fixed in a state
having an interference in the normal temperature state and the
interference is secured in a use temperature range of the fuel
25 injection valve 1.
11
[0021]
Furthermore, two mounting positions of the upstream side seal
positioning ring 13 and the downstream side seal positioning ring
15 are variable and the O-ring 14 can be attached at an optional
position on the outer circumference of the valve 5 holder 4; and
therefore, an advantage exists in that a degree of freedom of
mounting of the fuel injection valve 1 is increased.
[0022]
Further, since the shapes and the quality of the materials, in
10 which the upstream side seal positioning ring 13 is capable of being
fixed in the interference-fit state to the outer circumferential
surface of the valve holder 4 without being press-fitted on the
outer circumferential surface of the valve holder 4 from the top
end side, are selected, it provides a structure that does not damage
15 the seal surface of the O-ring 14, and this can suppress the risk
of an airtight leakage fault due to a cut of the O-ring 14 after
attachment.
[0023]
Fitting together by insertion of the upstream side seal
20 positioning ring 13 will be described. (Refer to Fig. 6.) In a
state where the fuel injection valve 1 is put under normal
temperature, the upstream side seal positioning ring 13, which is
made to expand by being heated to a high temperature, is inserted
onto the outer circumferential portion of the valve holder 4 from
25 the top end of the valve holder 4 and is made to shrink by being
12
cooled to return to the normal temperature at a predetermined
position, that is, at a position near the annular groove 12; and,
an inner circumferential upper end portion, which is a part of the
upstream side seal positioning ring 13, is fitted together in the
annular groove 12 and is fixed in the interference-5 fit state by
being shrunken.
[0024]
Further, the downstream side seal positioning ring 15 is
press-fitted from the top end of the valve holder 4 of the fuel
10 injection valve 1 to fix at a predetermined position. Finally, the
O-ring 14 inserted from the top end of the valve holder 4 of the
fuel injection valve 1 is latched between the upstream side seal
positioning ring 13 and the downstream side seal positioning ring
15; thus, it becomes a seal structure of an O-ring type.
15 [0025]
Furthermore, here, in the case where the inner diameter of the
upstream side seal positioning ring 13 is represented as d (at normal
temperature); a linear expansion coefficient, α1; the outer
circumferential diameter of the valve holder 4, D (at normal
20 temperature); a linear expansion coefficient, α2; and the use
temperature range of the fuel injection valve 1, from T1 to T2,
the dimensions thereof and the quality of the materials are
respectively set so as to establish the following equations.
·D(1+α2(T2-normal temperature))>d(1+α1(T2-normal temperature))
25 ·D(1+α2(T1-normal temperature))>d(1+α1(T1-normal temperature))
13
[0026]
Furthermore, when the upstream side seal positioning ring 13 is
inserted onto the valve holder 4 kept at the normal temperature
in a state of a high temperature T3 equal to or lower than a heat
resistant temperature of the upstream side seal 5 positioning ring
13, the dimensions thereof and the quality of the materials are
respectively set so as to establish the following equation.
·Dd(1+α1(T2-normal 5 temperature))
·D(1+α2(T1-normal temperature))>d(1+α1(T1-normal temperature))
[0036]
As described above, the dimensions thereof are set such that the
inner diameter of the upstream side seal positioning ring 13, which
10 is formed by being divided into, for example, two parts and coupled,
is smaller than the outer circumferential diameter of the valve
holder 4; and materials of the upstream side seal positioning ring
13 and the valve holder 4 may be selected such that the upstream
side seal positioning ring 13 and the valve holder 4 are fixed in
15 a state having an interference in a normal temperature state and
an interference is secured in the use temperature range of the fuel
injection valve 1.
[0037]
According to this Embodiment 2, the upstream side seal positioning
20 ring 13 is coupled at a predetermined position of the outer
circumference of the valve holder 4 in a state where the upstream
side seal positioning ring 13 is divided into two or more parts;
thus, a processing time can be shortened. Furthermore, an
advantage exists in that this coupling is high in degree of freedom
25 of construction method such as welding and press-fitting and
17
facilitates the selection of optimum construction method according
to production quantity.
[0038]
Embodiment 3.
Fig. 4 is a front view showing a fuel injection 5 valve according
to Embodiment 3. Fig. 5 is a front view showing the fuel injection
valve according to Embodiment 3. Fig. 6 is an enlarged front view
showing a relevant part of the fuel injection valve according to
Embodiment 3.
10 [0039]
A plurality of annular grooves 12 are provided on an outer
circumferential portion of a valve holder 4; and a first annular
groove 12a, a second annular groove 12b, and a third annular groove
12c are respectively arranged from the upstream side toward the
15 downstream side. This Embodiment 3 shows a case where a resin-made
upstream side seal positioning ring 13 is arranged on the first
annular groove 12a and it provides a structure in which a part of
the upstream side seal positioning ring 13 is latched on the first
annular groove 12a. Even if holding force by interference-fit is
20 reduced, the upstream side seal positioning ring 13 is prevented
from being pulled in an intake manifold 2b by the influence of
negative pressure.
[0040]
Furthermore, attachment positions of a plurality of O-rings 14
25 can be secured by a common fuel injection valve 1 by preliminarily
18
placing a plurality of the annular grooves 12 on the outer
circumference of the valve holder 4. In this case, the O-rings 14
can be placed at three places.
[0041]
The upstream side seal positioning ring 13 is 5 fitted together by
insertion onto the outer circumferential surface of the valve holder
4 in such a way that, as shown in Fig. 6, in a state where the valve
holder 4 of the fuel injection valve 1 is put under normal
temperature, the upstream side seal positioning ring 13, which is
10 made to expand by being heated to a high temperature, is inserted
onto the outer circumferential portion of the valve holder 4 from
the top end of the valve holder 4. Then, the upstream side seal
positioning ring 13 is further inserted to a predetermined position
on the upstream side, that is, to a position near the first annular
15 groove 12a of the annular groove 12. In this state, the upstream
side seal positioning ring 13 is made to shrink by being cooled
to return to the normal temperature; and an inner circumferential
upper end portion, which is a part of the upstream side seal
positioning ring 13, is fitted together in the first annular groove
20 12a of the annular groove 12 and is fixed in an interference-fit
state by being shrunken.
[0042]
The part of the upstream side seal positioning ring 13 formed of
resin is latched by a dimension P1 on the deep side of the first
25 annular groove 12a; thus, the upstream side seal positioning ring
19
13 is prevented from being dropped. More specifically, if a
press-fit state is kept for a long period, there is a concern that
holding force by the interference-fit of the upstream side seal
positioning ring 13 is reduced due to permanent set-in fatigue at
an interference-fit portion and the part of the 5 upstream side seal
positioning ring 13 is arranged in the first annular groove 12a
to create a gap state; thus, a dimensional change of this part does
not occur and the part of the upstream side seal positioning ring
13 is latched on the first annular groove 12a; and therefore, such
10 a failure can be prevented. Furthermore, a plurality of the annular
grooves 12 are placed on the outer circumference of the valve holder
4; thus, a degree of freedom of mounting of the O-ring 14 can be
imparted by the number of the annular grooves 12 in the common fuel
injection valve 1.
15 [0043]
Moreover, the upstream side seal positioning ring 13 can be
inserted onto the first annular groove 12a without coming in contact
with a seal surface S of the outer circumferential surface of the
valve holder 4; and the upstream side seal positioning ring 13 can
20 be latched on the first annular groove 12a without damaging the
seal surface S. Then, after the downstream side seal positioning
ring 15 is attached by insertion at a predetermined position of
the outer circumferential surface of the valve holder 4, the O-ring
type 14 is fitted together by insertion between the upstream side
25 seal positioning ring 13 and the downstream side seal positioning
20
ring 15, whereby the O-ring 14 is not cut and can suppress the risk
of an airtight leakage fault and the like.
[0044]
Embodiment 4.
Fig. 7 is a front view showing a fuel injection 5 valve according
to Embodiment 4. In the above-mentioned Embodiment 3, there has
been described the case where the upstream side seal positioning
ring 13 is fitted together in the uppermost first annular groove
12a; however, in this Embodiment 4, there is shown a case where
10 an upstream side seal positioning ring 13 is fitted together in
a second annular groove 12b from the upstream side and the same
effect as the above-mentioned Embodiment 3 can be exhibited.
[0045]
Embodiment 5.
15 Fig. 8 is a front view showing a fuel injection valve according
to Embodiment 5. In the above-mentioned Embodiment 3, the upstream
side seal positioning ring 13 is fitted together in the uppermost
first annular groove 12a; and in Embodiment 4, there has been
described the case where the upstream side seal positioning ring
20 13 is fitted together in the second annular groove 12b from the
upstream side; however, in this Embodiment 5, there is shown a case
where an upstream side seal positioning ring 13 is fitted together
in a most downstream side third annular groove 12c and the same
effect as the above-mentioned Embodiment 3 and Embodiment 4 can
25 be exhibited.
21
[0046]
Embodiment 6.
Fig. 9 is an enlarged front view showing a relevant part of a fuel
injection valve according to Embodiment 6. In this Embodiment 6,
the outer diameter dimensions of the valve holder 5 4 are different
at the upstream side and the downstream side thereof and the outer
diameter dimension of the downstream side valve holder 4 is set
smaller than the outer diameter dimension of the upstream side valve
holder 4.
10 [0047]
More specifically, in all annular grooves 12 provided in plural
on an outer circumferential portion of the valve holder 4, the outer
diameter dimension of the valve holder 4 on the downstream side
of the annular groove 12 is set smaller than the outer diameter
15 dimension of the valve holder 4 on the upstream side of the annular
groove 12.
[0048]
As one example, the relationship between a second annular groove
12b and a third annular groove 12c in Fig. 9 is such that the outer
20 diameter dimension Q2 of the valve holder 4 on the downstream side
of the third annular groove 12c has a relationship of Q1>Q2 with
respect to the outer diameter dimension Q1 of the valve holder 4
on the downstream side of the second annular groove 12b. The outer
diameter dimension Q2 of the valve holder 4 on the downstream side
25 of the third annular groove 12c is set smaller than the outer
22
diameter dimension Q1 of the valve holder 4 on the downstream side
of the second annular groove 12b by P2.
[0049]
In such a state, when the downstream side seal positioning ring
15 is press-fitted on the outer circumferential portion 5 of the valve
holder 4 on the downstream side of the second annular groove 12b,
the outer diameter dimension Q2 of the valve holder 4 on the
downstream side of the third annular groove 12c has the outer
diameter dimension that is smaller by P2. Then, there exists a gap
10 between the inner circumferential surface of the downstream side
seal positioning ring 15 and the outer circumferential surface of
the valve holder 4 on the downstream side of the third annular groove
12c and thus can create an unnecessary press-fit portion; and
therefore, the time of fitting together by insertion of the
15 downstream side seal positioning ring 15 can be shortened or a
press-fit cling can be suppressed.
[0050]
By the way, in the above-mentioned Embodiment, there has been
described the case where the outer diameter dimension Q2 of the
20 downstream side valve holder 4 is formed smaller than the outer
diameter dimension Q1 of the upstream side valve holder 4; however,
the present application is not limited to this, but the outer
diameter dimension Q2 of the downstream side valve holder 4 may
be formed in a tapered shape that becomes a small outer diameter
25 dimension toward the downstream side and the same effect can be
23
exhibited.
[0051]
Furthermore, the outer diameter dimension of a downstream side
end portion of the valve holder 4 can be formed smaller than the
outer diameter dimension of the upstream side 5 valve holder 4 and
the same effect can be exhibited.
[0052]
Incidentally, in the above-mentioned respective embodiments,
there has been described the case where the fuel injection valve
10 1 is mounted in, for example, the intake manifold serving as the
mounting structure of the internal combustion engine; however, it
can also be applied to the case where the fuel injection valve 1
is mounted in, for example, an engine head serving as the mounting
structure of the internal combustion engine and the same effect
15 can be exhibited. More specifically, since the fuel injection
valve 1 of the present application is made common to the intake
manifold or the engine head, the fuel injection valve 1 can be
realized easily and at low cost.
[0053]
20 The present application describes various exemplified
embodiments and examples; however, various features, aspects, and
functions described in one or a plurality of embodiments are not
limited to specific embodiments, but are applicable to embodiments
individually or in various combinations thereof.
25 Therefore, countless modified examples not exemplified are assumed
24
in technical ranges disclosed in the description of the present
application. For example, there include: a case in which at least
one constituent element is modified; a case, added; or a case,
deleted; and a case in which at least one constituent element is
extracted to combine with constituent 5 elements of other
embodiments.
INDUSTRIAL APPLICABILITY
[0054]
The present application is suitable for achieving a fuel injection
10 valve that can perform easily and at low cost.
DESCRIPTION OF REFERENCE NUMERALS
[0055]
1 Fuel injection valve, 3 Housing, 4 Valve holder, 5 Valve
body, 7 Valve seat, 12 Annular groove, 12a First annular groove,
15 12b Second annular groove, 12c Third annular groove, 13 Upstream
side seal positioning ring, 14 Annular seal member (O-ring), 15
Downstream side seal positioning ring
20
25
25
We Claim :
1. A fuel injection valve comprising:
a valve holder arranged in a housing;
a valve body arranged inside the valve holder; and
a valve seat arranged on a downstream side end portion 5 of the valve
body,
wherein the fuel injection valve includes:
an annular groove formed on the outer circumferential surface of
the valve holder;
10 an upstream side seal positioning ring which is arranged on the
outer circumferential surface of the valve holder in a loose-fit
state at the position of the annular groove, and in which a part
thereof is fitted together inside the annular groove by being
shrunken;
15 an annular seal member which is inserted onto the outer
circumferential surface of the valve holder and is arranged below
the upstream side seal positioning ring; and
a downstream side seal positioning ring which is inserted onto
the outer circumferential surface of the valve holder and is
20 arranged below the annular seal member.
2. The fuel injection valve according to claim 1,
wherein the upstream side seal positioning ring is formed such
that the inner diameter of the upstream side seal positioning ring
is smaller than the outer diameter of the valve holder in a normal
25 temperature state, and the inner diameter of the upstream side seal
26
positioning ring is larger than the outer diameter of the valve
holder in a high temperature state equal to or higher than a use
temperature range of the fuel injection valve; and
a part of the upstream side seal positioning ring is fitted
together in the annular groove in the use temperature 5 range of the
fuel injection valve.
3. The fuel injection valve according to claim 1 or claim 2,
wherein the upstream side seal positioning ring is divided in
plural.
10 4. The fuel injection valve according to any one of claim 1 to claim
3,
wherein the annular groove formed on the outer circumferential
surface of the valve holder is arranged in plural; and
the part of the upstream side seal positioning ring is fitted
15 together in any one of the annular grooves.
5. The fuel injection valve according to claim 4,
wherein the outer diameters of the valve holder are different
the upstream side and the downstream side
formed on the outer circumferential surface of the valve holder;
5 and
the outer diameter of the downstream side valve holder is formed
smaller than the outer diameter of the upstream side valve holder.