Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2003-06-16
2004-05-11
Miller, Carl S. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S456000
Reexamination Certificate
active
06732711
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fuel injection apparatus which increases a pressure of fuel within a fuel tank by a fuel pump, and injects to supply the fuel having the increased pressure to an engine via a fuel injection valve, and more particularly to a fuel distribution pipe to which the fuel having the increased pressure is supplied and a plurality of fuel injection valves are attached.
2. Description of Conventional Art
The conventional fuel distribution pipe to which a plurality of fuel injection valves are attached is shown in
FIGS. 8
,
9
and
10
.
FIG. 8
is a plan view of the lower side of the fuel distribution pipe,
FIG. 9
is a cross sectional view along a line L—L in
FIG. 8
, and
FIG. 10
is a cross sectional view showing a state in which the fuel injection valves are attached in a line M—M and the fuel distribution pipe is fixed and arranged to a fixing portion.
The present conventional art relates to a fuel distribution pipe for a 4-cylinder engine which is provided with four fuel injection valves and has four fuel distribution pipes to which the respective fuel injection valves are attached.
In
FIGS. 8 and 9
, first to fourth fuel distribution pipes are arranged from the left to the right.
A first fuel distribution pipe
20
is structured such that an injection valve insertion hole
20
A is opened upward in
FIG. 9
, a fuel introduction hole
20
B is horizontally provided leftward from the right end, and the left end of the fuel introduction hole
20
B is communicated with the injection valve insertion hole
20
A.
Further, reference symbol
20
C denotes a mounting hole. The mounting hole
20
C is provided in parallel to the longitudinal axial line of the injection valve insertion hole
20
A, and is formed in one side of the injection valve insertion hole
20
A. (The mounting hole
20
C is shown in
FIG. 8.
)
In this case, in the first fuel distribution pipe
20
, a hole
20
D open to the left end is not communicated with the injection valve insertion hole
20
A.
A second fuel distribution pipe
21
is structured such that an injection valve insertion hole
21
A is opened upward, a first fuel introduction hole
21
B is horizontally provided leftward from the right end, a second fuel introduction hole
21
C is horizontally provided rightward from the left end, and the first and second fuel introduction holes
21
B and
21
C are both communicated with the injection valve insertion hole
21
A.
Further, reference symbol
21
D denotes a mounting hole. The mounting hole
21
D is provided in the same direction as that of the injection valve insertion hole
21
A, and is formed in one side of the injection valve insertion hole
21
A.
The third fuel distribution pipe is the same as the second fuel distribution pipe, however, a description will be given by using new reference symbol for making the description easy.
A third fuel distribution pipe
22
is structured such that an injection valve insertion hole
22
A is opened upward, a first fuel introduction hole
22
B is horizontally provided leftward from the right end, a second fuel introduction hole
22
C is horizontally provided rightward from the left end, and the first and second fuel introduction holes
22
B and
22
C are both communicated with the injection valve insertion hole
22
A.
Further, reference symbol
22
D denotes a mounting hole. The mounting hole
22
D is provided in the same direction as that of the injection valve insertion hole
22
A, and is formed in one side of the injection valve insertion hole
22
A.
A fourth fuel distribution pipe
23
is structured such that an injection valve insertion hole
23
A is opened upward, a fuel introduction hole
23
B is horizontally provided rightward from the left end, and the right end of the fuel introduction hole
23
B is communicated with the injection valve insertion hole
23
A. Further, reference symbol
23
C denotes a mounting hole. The mounting hole
23
C is provided in parallel to the longitudinal axial line of the injection valve insertion hole
23
A, and is formed in one side of the injection valve insertion hole
23
A.
In this case, in the fourth fuel distribution pipe
23
, a hole
23
D open to the right end is not communicated with the injection valve insertion hole
23
A.
In accordance with the fuel distribution pipe mentioned above, the fuel introduction hole
20
B of the first fuel distribution pipe
20
and the second fuel introduction hole
21
C of the second fuel distribution pipe
21
are arranged so as to be opposed to each other, and they are connected by a first fuel joint
24
constituted by a straight pipe.
Further, the first fuel introduction hole
21
B of the second fuel distribution pipe
21
and the second fuel introduction hole
22
C of the third fuel distribution pipe
22
are arranged so as to be opposed to each other, and they are connected by a second fuel joint
25
constituted by a T-shaped pipe.
Further, the first fuel introduction hole
22
B of the third fuel distribution pipe
22
and the fuel introduction hole
23
B of the fourth fuel distribution pipe
23
are arranged so as to be opposed to each other, and they are connected by a third fuel joint
26
constituted by a straight pipe.
Further, a rear end portion of a fuel injection valve J (shown in
FIG. 10
) is inserted and arranged within each of the injection valve insertion holes
20
A,
21
A,
22
A and
23
A of the respective fuel distribution pipes
20
,
21
,
22
and
23
, and a leading end portion of each of the fuel injection valves J is inserted and arranged within a guide hole
26
B of a throttle body
26
in which an intake passage
26
A is provided.
Then, in such a state, the respective fuel distribution pipes
20
,
21
,
22
and
23
are fixed to the throttle body
26
corresponding to a fixing portion by inserting a screw member
27
within the mounting holes
20
C,
21
D,
22
D and
23
C, and screwing the screw member
27
with the throttle body
26
.
In the manner mentioned above, each of the fuel distribution pipes
20
,
21
,
22
and
23
is fixed to the throttle body
26
, and fuel is supplied to each of the fuel distribution pipes in the following manner.
A part of the fuel supplied to the second fuel joint
25
is introduced to the first fuel introduction hole
21
B of the second fuel distribution pipe
21
, and this fuel is supplied toward the fuel injection valve J attached to the injection valve insertion hole
21
A of the second fuel distribution pipe
21
.
Further, the fuel within the first fuel introduction hole
21
B of the second fuel distribution pipe
21
is introduced to the fuel introduction hole
20
B of the first fuel distribution pipe
20
via the second fuel introduction hole
21
C and the first fuel joint
24
, and this fuel is supplied toward the fuel injection valve J screwed with the injection valve insertion hole
20
A of the first fuel distribution pipe
20
.
On the other hand, another part of the fuel supplied to the second fuel joint
25
is introduced to the second fuel introduction hole
22
C of the third fuel distribution pipe
22
, and this fuel is supplied toward the fuel injection valve J attached to the injection valve insertion hole
22
A of the third fuel distribution pipe
22
.
Further, the fuel within the second fuel introduction hole
22
C of the third fuel distribution pipe
22
is introduced to the fuel introduction hole
23
B of the fourth fuel distribution pipe
23
via the first fuel introduction hole
22
A and the third fuel joint
26
, and this fuel is supplied toward the fuel injection valve J screwed with the injection valve insertion hole
23
A of the fourth fuel distribution pipe
23
.
In accordance with the fuel distribution pipe in the conventional fuel injection apparatus mentioned above, three fuel distribution pipes are required. That is, there are provided the first fuel distribution pipe
20
, the second fuel distribution pipe
21
and the fourth fuel distribution pipe
23
.
The first fuel distribution pipe
20
and the fourth fuel di
Coleman Henry D.
Keihin Corporation
Miller Carl S.
Sapone William J.
Sudol R. Neil
LandOfFree
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