[0001] The present invention relates to a fuel injection system for supplying a fuel to
a combustion chamber of an internal combustion engine, and a fuel injection valve
device used in the fuel injection system.
[0002] Any related fuel injection valve devices has a nozzle portion having an injection
port injecting a fuel to a combustion chamber of an internal combustion engine, and
a housing incorporating a valve element opening/closing the injection port, a driving
portion opening/closing the valve element, and a flow path for supplying a fuel.
[0003] As an example of such fuel injection valve device,
JP-A No. 2003-49740 discloses a technical idea that in a fuel injection valve holding device for holding
a fuel injection valve device in which a fuel-outlet-side end portion is inserted
to an mounting hole of an intake pipe structure of an engine, a joint cap fitted to
an outer peripheral portion of a fuel-inlet-side end portion and connecting between
the fuel hose and the fuel injection valve is held by a fixing holder provided to
a bracket to erect from an outer surface of the intake pipe structure. Owing to such
construction, the number of components or manufacturing cost can be reduced.
[0004] The present invention has been accomplished in view of the above technical idea,
and an object of the present invention is to further facilitate attachment and maintenance
of a fuel injection system that can respond to a demand for installation in a narrower
space or characteristics of a connected fuel hose, and a fuel injection valve device
used in the fuel injection system and to provide a fuel injection system that realizes
reduction in the number of components, size, and costs, and a fuel injection valve
device used in the fuel injection system.
[0005] This and other objects are achieved by the invention with a fuel injection system
according to claim 1.
[0006] A fuel injecting system according to the present invention includes: a fuel hose;
a fuel supply tube having one end integrally connected with the fuel hose; a fuel
injection valve device provided with a nozzle portion having an injection port for
supplying a fuel introduced from a fuel tank though the fuel hose to a combustion
chamber of an internal combustion engine through a connection tube and connected with
the other end of the fuel supply tube; and an intake path communicating with the combustion
chamber, the nozzle portion being attached toward the intake path.
[0007] According to the above construction, in the case of supplying a fuel from the fuel
tank to the combustion chamber through the fuel injection valve device by way of the
fuel supply tube integrally connected with the fuel hose, the fuel supply tube can
be easily connected with the fuel injection valve device. Hence, attachment of the
fuel supply tube to the fuel injection valve device and maintenance are facilitated.
Further, the structure for attaching the fuel injection valve device to the intake
path is simplified, making it possible to reduce the number of components, size, and
manufacturing costs of the injection fuel system.
[0008] Further, in the fuel injection system, the fuel injection valve device has a flow
path for supplying a fuel introduced through the connection tube to the injection
port, and a housing portion provided with the connection tube at one end in an axial
direction of the flow path, and with the nozzle portion at the other end, and the
fuel supply tube or the housing portion has a flange portion, and the fuel injection
valve device is fixed to the intake pipe through the flange portion. In this case,
the fuel injection valve device can be easily and securely fixed to the intake pipe.
In addition, the fuel supply tube can be connected to the thus-fixed fuel injection
valve device, so attachment of each component or maintenance of the fuel injection
system is further facilitated.
[0009] Further, if the fuel hose and the fuel supply tube are made of a resin material,
deteriorations due to a fuel or heat can be significantly suppressed. In addition,
in the case of using the fuel hose made of a resin material, the fuel supply tube
and the connection tube are easily connected in the fuel injection system, so the
fuel injection valve device can be connected to the fuel supply tube with ease, and
high attachment and maintenance efficiencies can be ensured.
[0010] Furthermore, it is preferable that the fuel hose and the fuel supply tube be integrally
connected through a press-fitting process. Further, if the fuel supply tube and the
connection tube of the fuel injection valve device are detachably attachable, the
attachment and maintenance efficiencies of the fuel injection system are further improved.
[0011] A fuel injection valve device according to the present invention includes: a connection
tube connected with one end of a fuel supply tube the other end of which is integrally
connected with a fuel hose; and a nozzle portion having an injection port for supplying
a fuel introduced from a fuel tank though the fuel hose to a combustion chamber of
an internal combustion engine through the connection tube and attached to an intake
pipe communicating with the combustion chamber.
[0012] According to the above construction, in the case of using the fuel supply tube having
one end integrally connected with the fuel hose, the fuel supply tube and the fuel
injection valve device can be easily connected, so the attachment and maintenance
efficiencies of the fuel injection valve device are improved. Further, the structure
for attaching the fuel injection valve device is simplified, making it possible to
reduce the number of components and the size.
[0013] Further, the fuel injection valve device has a flow path for supplying a fuel introduced
through the connection tube to the injection port, and a housing portion provided
with the connection tube at one end in an axial direction of the flow path, and with
the nozzle portion at the other end, and the housing portion has a flange portion
for fixing the fuel injection valve device to the intake pipe. This construction is
preferred because the attachment of the fuel injection valve device is further facilitated.
[0014] Further, if the connection tube is detachably attachable to the fuel supply tube,
the attachment and maintenance efficiencies of the fuel injection valve device are
more improved.
[0015] According to the present invention, the attachment and maintenance efficiencies of
the fuel injection valve device in the fuel injection system can be improved. In addition,
according to the present invention, it is possible to reduce the number of components,
size, and manufacturing costs of the fuel injection valve device and the fuel injection
system.
[0016] Hereinafter, a fuel injection system according to the present invention will be described
in detail in relation to a fuel injection valve device used in the fuel injection
system based on preferred embodiments with reference to the accompanying drawings,
in which:
Fig. 1 is a longitudinal sectional view of a fuel injection system according to a
first embodiment of the present invention in a partially broken form;
Fig. 2A is a sectional view of a fuel hose of the embodiment, and Fig. 2B is a sectional
view of how the diameter of the fuel hose of the embodiment is expanded;
Fig. 3 is a longitudinal sectional view illustrating a procedure of connecting components
of the fuel injection system in a partially broken form;
Fig. 4 is a sectional view taken along the line IV-IV of Fig. 3;
Fig. 5 is a longitudinal sectional view of a fuel injection system according to a
second embodiment of the present invention in a partially broken form;
Figs 6: Fig. 6A is a plan view of a flange plate of the embodiment, Fig. 6B is an
explanatory view of how the two flange plates cover a groove portion of a housing
portion, and Fig. 6C is an explanatory view of such a state that the two flange plates
cover the groove portion of the housing portion; and
Fig. 7 is a longitudinal sectional view of a fuel injection system according to a
third embodiment of the present invention in a partially broken form.
[0017] Referring to Figs. 1 to 4, a first embodiment of the present invention is described
below. Fig. 1 is a longitudinal sectional view of a fuel injection system 10a according
to the first embodiment of the present invention in a partially broken form.
[0018] As shown in Fig. 1, the fuel injection system 10a includes: an intake pipe 14 having
a mounting hole 12 formed in an outer wall surface; a fuel injection valve device
16 fixed to the intake pipe 14 and supplying a fuel to an unillustrated combustion
chamber of an internal combustion engine; and a fuel supply tube 18 connected to the
fuel injection valve device 16 and supplying the fuel supplied from an unillustrated
fuel tank storing the fuel to be supplied to the combustion chamber of the internal
combustion engine through a fuel hose 17 toward the fuel injection valve device 16.
[0019] Further, the intake pipe 14 includes an intake path 20 communicating with the combustion
chamber of the internal combustion engine and functions as an intake duct. A throttle
valve 22 for opening/closing the intake path 20 is journalled into the intake path
20.
[0020] The mounting hole 12 is formed such that a fuel from a nozzle portion 30 of the fuel
injection valve device 16 is injected into the intake path 20 on the downstream side
of the throttle valve 22. Incidentally, a screw portion 26 is formed in a protruded
outer wall surface of the intake pipe 14 on an upstream side of the mounting hole
12, and a bolt 24 is fastened to the screw portion 26 as described later. On the other
hand, a ring-shaped groove portion 13 is formed on the inner peripheral surface of
the mounting hole 12. A sealing member 15 for example an 0-ring, is provided to the
groove portion 13. Hence, the sealing member 15 is brought into contact with the outer
peripheral surface of the nozzle portion 30 to prevent fuel from leaking from a gap
between the mounting hole 12 and the nozzle portion 30.
[0021] The fuel injection valve device 16 has a housing portion 28 having a substantially
cylindrical shape, a cylindrical nozzle portion 30 inserted to an end portion on the
mounting hole 12 side, and a connection tube 32 protruding at an end portion opposite
to the nozzle portion 30.
[0022] The nozzle portion 30 is provided with an injection port 34 at its tip, and incorporates
a valve element 36 for opening/closing the injection port 34; fuel is injected from
the injection port into the intake path 20. The connection tube 32 includes a flow
path 38 through which fuel supplied from the fuel supply tube 18 flows, and has a
diameter-expanded portion 40 formed on the outer peripheral surface of the connection
tube 32 at around the central position of the tube in the axial direction thereof,
in a ring shape. The flow path 38 passes through the housing 28 and communicates with
the injection port 34 of the nozzle portion 30. Fuel is introduced to the flow path
38 from an opening 42 of the connection tube 32 formed at an end portion opposite
to the housing 28 side. Further, if the connection tube 32 is inserted and connected
to a joint 44 of the fuel supply tube 18 as described below, the diameter-expanded
portion 40 functions to engage with an engagement claw 56 of the joint 44 to thereby
prevent the joint 44 from being separated from the connection tube 32. A detailed
description thereof is given below.
[0023] A flange portion 48 is further provided at the end portion of the housing portion
28 where the connection tube 32 protrudes; the flange portion serves to fix the fuel
injection valve device 16 to the intake pipe 14. A bolt insertion hole 50 is formed
in the flange portion 48, and the bolt 24 is screwed to the screw portion 26 through
the bolt insertion hole 50, thereby fixing the fuel injection valve device 16 to the
intake pipe 14 (see Figs. 1 and 3).
[0024] A not-shown electromagnetic actuator is accommodated in the housing portion 28. The
electromagnetic actuator includes a coil bobbin made of a synthetic resin, for example,
and moves the valve element 36 of the nozzle portion 30 forward and backward through
a not-shown rod. Hence, a power-supplying connector 52 supplying power to the electromagnetic
actuator is attached to the housing portion 28, and the power-supplying connector
52 is connected to not-shown driving means.
[0025] The fuel supply tube 18 is integrally connected with the fuel hose 17, and composed
of the joint 44 and a retainer 45. The fuel hose 17 is press-fitted to a stepped fuel
hose insertion portion 46 formed at one end of the joint 44, and integrally and externally
engaged. Further, the retainer 45 is provided at the other end of the joint 44, and
the joint 44 and the connection tube 32 of the fuel injection valve device 16 are
detachably connected through the retainer 45. The retainer 45 can be moved backward
and forward in the axial direction by fitting a projection 57 to a recess 58 of the
joint 44. A flow path 54 passing a fuel supplied from the fuel hose 17 to the fuel
path 38 of the fuel injection valve device 16 is formed in the fuel hose insertion
portion 46.
[0026] Incidentally, it is preferred that the fuel supply tube 18, that is, the joint 44
and the retainer 45 be formed of a resin material, for example, PA12 (polyamide 12).
[0027] Then, at the time of connecting the fuel supply tube 18 integrally coupled with the
fuel hose 17 to the fuel injection valve device 16, the connection tube 32 of the
fuel injection valve device 16 is inserted into the joint 44 through the retainer
45, and the diameter expanded portion 40 of the connection tube 32 engages with the
engagement claw 56 of the retainer 45. Further, at this time, the projection 57 formed
at around the central portion of the retainer 45 is brought into contact with a side
surface 58a of the recess 58 and fitted into the recess.
[0028] Hence, if the fuel injection valve device 16 and the fuel supply tube are connected,
the retainer 45 is fixed due to the engagement between the diameter expanded portion
40 and the engagement claw 56 and between the projection 57 and the side surface 58a
of the recess 58, with the result that the slippage from the connection tube 32 of
the joint 44 is prevented with reliability. Further, a dome-shaped projection 60 of
the connection tube 32 is fitted into a not-shown recess formed in the inner wall
surface of the joint 44 to thereby attain whirl-stop between the fuel injection tube
18 and the connection tube 32.
[0029] Incidentally, if the connection tube 32 is inserted into the joint 44, the outer
peripheral surface around the tip end of the connection tube 32 is brought into contact
with two sealing members 64 provided along the inner peripheral surface of the joint
44, and thus a high degree of liquid tightness is held inside the joint 44. As the
sealing members 64, an O-ring is preferred.
[0030] Further, the fuel hose 17 is made of a flexible resin material and is deformable
when placed between the fuel tank of the internal combustion engine and the fuel injection
valve device 16.
[0031] Referring to Figs. 2, the fuel hose 17 is described in detail. Fig. 2A is a sectional
view of the fuel hose 17 of this embodiment, and Fig. 2B is a sectional view of how
the diameter of the fuel hose 17 is expanded before the fuel hose 17 is press-fitted
to the fuel hose insertion portion 46 of the joint 44 and connected.
[0032] As shown in Fig. 2A, the fuel hose 17 is composed of, for example, a tube 17a made
of PA 12 (polyamide 12) with the thickness of 0.55 mm and the inner diameter of 2.5
mm, a 0.2 mm-thick inner tube 17b made of ETFE (tetrafluoroethylene-ethylene copolymer)
as an inner layer of the tube 17a, and a 1.0 mm-thick protective tube 17c made of
EPDM (ethylenepropylene rubber) and provided for protecting the tube 17a from UV,
strong acid, and chipping. At the time of press-fitting the thus-formed fuel hose
17 to the fuel hose insertion portion 46 of the joint 44, as shown in Fig. 2B, the
diameter of the hose is expanded at a portion of a predetermined length L from an
end portion where the fuel hose insertion portion 46 is inserted to form a diameter-expanded
portion 66.
[0033] The fuel hose 17 is made of the aforementioned resin material, so deteriorations
due to heat or a fuel can be considerably suppressed as compared with a conventionally
popular rubber material.
[0034] Meanwhile, elasticity of the resin material is generally smaller than the rubber
material. It is preferred that the outer diameter of the fuel hose insertion portion
46 be set slightly larger than the inner diameter of the fuel hose 17, for example,
set to about 2.5 mm as the inner diameter of the tube 17a, because adhesion between
the fuel hose 17 and the fuel hose insertion portion 46 is increased. Thus, in the
fuel hose 17 of this embodiment, the diameter of a portion of the predetermined length
L from the end portion of the fuel hose 17 is expanded in advance to form the diameter-expanded
portion 66, making it possible to easily insert the fuel hose insertion portion 46
to the fuel hose 17, to enhance the adhesion between the fuel hose 17 and the fuel
hose insertion portion 46, and to improve an efficiency in connecting the these components.
[0035] As shown in Fig 1, the groove portion 68 is formed in a ring shape on the outer peripheral
surface of the fuel hose insertion portion 46, and the groove portion 68 is provided
with the sealing members 69, for example, an O-ring. Thus, an adhesion between the
fuel hose 17 and the fuel hose insertion portion 46 is further enhanced and, in addition,
it is possible to prevent the fuel hose 17 from coming off from the fuel hose insertion
portion 46 due to a creep that develops with time or prevent leakage of liquids from
a gap between the fuel hose 17 and the fuel hose insertion portion 46.
[0036] Referring next to Fig. 3, description is made of a procedure of connecting the intake
pipe 14 to the fuel injection valve device 16 and the fuel supply tube 18 in the fuel
injection system 10a thus constructed. Fig. 3 is a longitudinal sectional view illustrating
a procedure of connecting components of the fuel injection system 10a in a partially
broken form. In this example, it is assumed that the fuel hose 17 and the joint 44
of the fuel supply tube 18 are coupled in advance and integrally formed.
[0037] First, the fuel injection valve device 16 is connected with the intake pipe 14. In
this case, the nozzle portion 30 of the fuel injection valve device 16 is inserted
to the mounting hole 12 of the intake pipe 14 while the bolt 24 is fastened to the
screw portion 26 through the bolt insertion hole 50 formed in the flange portion 48.
Hence, the fuel injection valve device 16 is securely fixed to the intake pipe 14
with ease. Further, the injection port 34 formed at the tip end of the nozzle portion
30 is directed to the intake path 20, making it possible to inject a fuel to the intake
path 20 from the fuel injection valve device 16.
[0038] Next, as described above, the connection tube 32 of the fuel injection valve device
16 fixed to the intake pipe 14 is connected with the fuel supply tube 18. In this
case, since the fuel injection valve device 16 is fixed to the intake pipe 14, the
connection tube 32 can be readily and securely inserted inside the joint 44 through
the retainer 45.
[0039] Further, at this time, the diameter expanded portion 40 of the connection tube 32
engages with the engagement claw 56 of the retainer 45, and the projection 57 engages
with the side surface 58a of the recess 58. Thus, the retainer 45 is fixed to prevent
the joint 44 from coming off from the connection tube 32. As a result, the fuel injection
valve device 16 and the fuel supply tube 18 are more securely connected together.
[0040] As described above, the fuel injection system 10a of this embodiment is constructed
such that the fuel injection valve device 16 is fixed to the intake pipe 14, and the
joint 44 of the fuel supply tube 18 is connected with the protruded connection tube
32 of the fuel injection valve device 16. Therefore, it is unnecessary to provide
a fixing holder used in the related structure, and the number of components, the size,
and the manufacturing costs can be reduced.
[0041] Further, in the case where the fuel hose 17 is made of a resin material, an operation
of press-fitting the fuel hose 17 to the fuel hose insertion portion 46 and coupling
these is required as mentioned above. Such a press-fitting operation is undesirable
in a not-shown motorcycle or four-wheel vehicle incorporating an internal combustion
engine, for example, in terms of working efficiency.
[0042] To that end, in this embodiment, the fuel hose 17 and the fuel supply tube 18 are
integrally coupled in advance while the fuel injection valve device 16 is fixed to
the intake pipe 14, by which the fuel supply tube 18 can be easily connected with
the connection tube 32. Thus, even if the fuel hose 17 is made of a resin material,
the connection of components of the fuel injection system l0a is easily carried out,
and the working efficiency can be improved. In addition, deteriorations of the fuel
hose 17 due to heat or fuel can be remarkably suppressed. Further, the joint 44 facilitates
attachment/detachment of the fuel supply tube 18 to/from the fuel injection valve
device 16. This improves attachment and maintenance efficiencies of the fuel injection
valve device 16 and in turn improves an efficiency of installing the fuel supply tube
18.
[0043] Next, a second embodiment of the present invention is described with reference to
Figs. 5 and 6. Fig. 5 is a longitudinal sectional view showing a fuel injection system
10b according to the second embodiment of the present invention in a partially broken
form. Here, in Fig. 5, the same reference numerals as those of Figs. 1 to 4 denote
identical or similar components. These components have similar functions and effects,
and thus detailed description thereof is omitted here.
[0044] The fuel injection system 10b of this embodiment differs from the fuel injection
system 10a of the above embodiment in that a fuel injection valve device 72 is provided
in place of the fuel injection valve device 16. The fuel injection valve device 72
differs from the fuel injection valve device 16 in that a housing portion 74 replaces
the housing portion 28.
[0045] The housing portion 74 has a substantially cylindrical shape, and an annular groove
portion 76 is formed in the outer peripheral surface near a portion where the flange
portion 48 is formed in the housing portion 28. Two flange plates 80 (see Fig. 6A)
as thin plates having a hook portion 81 and a bolt insertion hole 78 are stacked so
as to hold the groove portion 76 in the directions indicated by arrows of Fig. 6B.
Then, the bolt 24 is fastened to the bolt insertion holes 78 all together to thereby
fix the fuel injection valve device 72 to the intake pipe 14.
[0046] Incidentally, one flange plate 80 may be used and fixed to the groove portion 76
of the housing portion 74 by means of bonding or welding to thereby combine the housing
portion 74 and the flange plate 80.
[0047] As described above, according to the fuel injection system lOb of this embodiment,
the fuel injection valve device 72 is fixed to the intake pipe 14 by means of the
flange plate 80, so the flange portion 48 can be omitted, and the fuel injection valve
device 72 is simplified in shape. Therefore, a manufacturing cost of the fuel injection
valve device 72 can be reduced. Further, the flange plates 80 and the housing portion
74 can be separated only by slightly loosening the bolt 24 from the screw portion
26, with the result that the maintenance efficiency is further improved.
[0048] Next, a third embodiment of the present invention is described with reference to
Fig. 7. Fig. 7 is a longitudinal sectional view showing a fuel injection system 10c
according to the third embodiment of the present invention in a partially broken form.
[0049] The fuel injection system 10c of this embodiment differs from the fuel injection
system 10a of the above embodiment in that a fuel injection valve device 82 replaces
the fuel injection valve device 16, and a fuel supply tube 84 replaces the fuel supply
tube 18. The fuel injection valve device 82 differs from the fuel injection valve
device 16 in that a substantially cylindrical housing portion 86 not provided with
the flange portion 48 is used. In addition, the fuel supply tube 84 differs from the
fuel supply tube 18 in that a joint 90 replaces the joint 44.
[0050] A flange portion 94 having a bolt insertion hole 92 is formed near the recess 58
of the joint 90. The flange portion 94 has substantially the same shape as the flange
portion 48 of the fuel injection valve device 16.
[0051] Thus, in this embodiment, at the time of connecting the fuel supply tube 84 with
the connection tube 32 after inserting the nozzle portion 30 of the fuel injection
valve device 82 to the mounting hole 12 of the intake pipe 14, the bolt 24 fastens
the fuel supply tube 84 and the fuel injection valve device 82 all together through
the bolt insertion hole 92.
[0052] As described above, the fuel injection system 10c of this embodiment is structured
such that the flange portion 94 formed in the joint 90 fixes the fuel supply tube
84 and the fuel injection valve device 82 all together to the intake pipe 14. This
makes it possible to prevent the fuel supply tube 84 from shaking or rattling at a
node between the fuel supply tube 84 and the fuel injection valve device 82, for example,
to omit an operation of fixing the fuel hose 17 to a predetermined member of the internal
combustion engine. Further, the flange portion 48 can be omitted, so the fuel injection
valve device 82 can be simplified in shape. A manufacturing cost of the fuel injection
valve device 82 can be further reduced.
[0053] As set forth above, the present invention is described based on the respective embodiments.
However, the present invention is not limited thereto but may adopt various other
modifications without departing from the scope of the invention.
[0054] For example, as the fuel hose 17, any hose can be used without particular limitations
insofar as having characteristics required of a fuel hose for passing a fuel such
as gasoline. However, the layered structure of the tube 17a, the inner tube 17b, and
the protective tube 17c described in the above embodiment is preferred. Further, the
fuel hose 17 and the fuel supply tubes 18 and 84 may be made of any resin material
without particular limitations. A polyamide resin and a fluororesin can be preferably
used.
[0055] Further, the fuel injection valve device 16 is attached to the intake pipe 14, but
the present invention is not limited thereto. The nozzle portion 30 of the fuel injection
valve device 16 can be directly attached to a cylinder head or the like of the combustion
chamber to be directed to the intake path to the combustion chamber.
Reference numerals
[0056]
10a, 10b, 10c... Fuel injection system
12... Mounting hole
16, 72, 82... Fuel injection valve device
18, 84... Fuel supply tube
22... Throttle valve
26... Screw portion
30... Nozzle portion
34... Injection port
38, 54... Flow path
46... Fuel hose insertion portion
50, 78, 92... Bolt insertion hole
14... Intake pipe
17... Fuel hose
20... Intake path
24... Bolt
28, 74, 86... Housing portion
32... Connection tube
36... Valve element
44, 90... Joint
48, 94... Flange portion
80... Flange plate
1. A fuel injecting system (10a, 10b, 10c) comprising:
a fuel hose (17);
a fuel supply tube (18; 84) having one end integrally connected with the fuel hose
(17);
a fuel injection valve device (16; 72; 82) provided with a nozzle portion (30) having
an injection port (34) for supplying a fuel introduced from a fuel tank though the
fuel hose (17) to a combustion chamber of an internal combustion engine through a
connection tube (32) and connected with the other end of the fuel supply tube (18;
84); and
an intake path (20) communicating with the combustion chamber,
the nozzle portion (30) being attached toward the intake path (20).
2. The fuel injection system according to Claim 1,
wherein the fuel injection valve device (16; 72; 82) has a flow path (38; 54) for
supplying a fuel introduced through the connection tube (32) to the injection port
(34), and a housing portion (28; 74; 86) provided with the connection tube (32) at
one end in an axial direction of the flow path (38; 54), and with the nozzle portion
(30) at the other end, and
the fuel supply tube (84) or the housing portion (28; 74) has a flange portion (94;
48; 80), and the fuel injection valve device (16; 72; 82) is fixed to the intake path
(20) through the flange portion (94; 48; 80).
3. The fuel injection system according to Claim 1 or 2, wherein the fuel hose (17) and
the fuel supply tube (18; 84) are made of a resin material.
4. The fuel injection system according to any one of Claims 1 to 3,
wherein the fuel hose (17) and the fuel supply tube (18; 84) are integrally connected
through a press-fitting process.
5. The fuel injection system according to any one of Claims 1 to 4,
wherein the fuel supply tube (18; 84) and the connection tube (32) of the fuel injection
valve device (16; 72; 82) are detachably attachable.
6. A fuel injection valve device for use in a system according to one of the preceding
claims, comprising:
a connection tube (32) connected with one end of a fuel supply tube (18; 84) the other
end of which is integrally connected with a fuel hose (17); and
a nozzle portion (30) having an injection port (34) for supplying a fuel introduced
from a fuel tank though the fuel supply tube (18; 84) to a combustion chamber of an
internal combustion engine through the connection tube (32) and attached to an intake
path (20) communicating with the combustion chamber.
7. The fuel injection valve device according to Claim 6,
wherein the fuel injection valve device has a flow path (38, 54) for supplying a fuel
introduced through the connection tube (32) to the injection port (34), and a housing
portion (28; 74; 86) provided with the connection tube (32) at one end in an axial
direction of the flow path (38; 54), and with the nozzle portion (30) at the other
end, and
the housing portion (28; 74; 86) has a flange portion (48; 80; 94) for fixing the
fuel injection valve device (16; 72; 82) to the intake path (20).
8. The fuel injection valve device according to Claim 6 or 7,
wherein the connection tube (32) is detachably attachable to the fuel supply tube
(18; 84).