Metal working – Method of mechanical manufacture – Gas and water specific plumbing component making
Reexamination Certificate
1999-10-12
2001-05-08
Rosenbaum, I Cuda (Department: 3726)
Metal working
Method of mechanical manufacture
Gas and water specific plumbing component making
C029S890144, C072S348000
Reexamination Certificate
active
06226868
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a connector for a fuel injection nozzle and a method of producing the same. More particularly, the present invention relates to a connector for a fuel injection nozzle usable for a motor-vehicle and a method of producing the same.
An internal combustion engine is known which includes a fuel delivery pipe to which a connector for a fuel injection nozzle is attached. An example of such an engine is illustrated in FIG.
15
. In
FIG. 15
, reference numeral
2
denotes a cylinder block of an engine
1
in which a cylinder bore
3
is formed and a piston
4
is slidably disposed for reciprocation in the cylinder bore
3
. A cylinder head
5
is arranged on the upper part of the cylinder bore
3
, and an ignition plug
6
and suction valves
7
are disposed on the cylinder head
5
. A suction manifold
8
is connected to the cylinder head
5
in a lateral direction, and a fuel injection nozzle
9
is slantwise attached to the upper part of the suction manifold
8
.
As shown in FIG.
16
and
FIG. 17
, a delivery pipe
11
is connected to the fuel injection nozzle
9
via a connector
10
for the fuel injection nozzle
9
. As shown in
FIG. 15
to
FIG. 18
, the delivery pipe
11
has a rectangular cross-sectional shape, and one end thereof is closed and the other end has a conduit
12
connected thereto. Holes
13
are formed on the lower surface of the delivery pipe
11
, and the connector
10
as shown in FIG.
19
and
FIG. 20
is fitted into each of the holes
13
so that fuel can be fed into the fuel injection nozzle
9
via the delivery pipe
11
and the connector
10
.
As shown in FIG.
19
and
FIG. 20
, the connector
10
includes a cylindrical fuel injection nozzle fitting portion
14
having an enlarged diameter and a delivery pipe connecting portion
15
having a reduced diameter and formed integrally with the fuel injection nozzle fitting portion
14
. Each of the fuel injection nozzle fitting portion
14
and the delivery pipe connecting portion
14
is formed from a steel material by machining. An outwardly projecting position determining member
16
having a rectangular sectional shape is welded to the outer peripheral surface of the fitting portion
14
, and the fuel injection nozzle
9
and the delivery pipe
11
are connected at predetermined positions by fitting the position determining member
16
into a recess in a main body of the fuel injection nozzle
9
and by fitting the connecting portion
15
into the hole
13
of the delivery pipe
11
, whereby the fuel fed from the fuel injection nozzle
9
can be injected into the internal combustion engine
1
at a high efficiency.
In the conventional connector
10
as described above, the position determining member
16
is first fabricated from a steel material such as a round rod by the steps of machining, finishing and press-working and then welded to the injection nozzle fitting portion
14
. For this reason, the material cost and working cost required for producing the connector
10
are unavoidably increased, and there is a further problem in that the thickness and weight of the convectional connector
10
cannot be reduced as desired due to a limitation to the machining operation. To eliminate these problems, it is thinkable to fabricate the connector from a steel sheet material subjected to deep drawing, but in this case other problems occur such as low dimensional accuracy, low productivity induced by deformation of the connector
10
due to thermal stress generated by subsequent welding or soldering of the position determining member to the connector.
SUMMARY OF THE INVENTION
The present invention has been made in consideration of the above stated problems, and the object of the present invention is to provide a connector for a fuel injection nozzle and a method of producing the same, wherein the connector has light weight and exhibits excellent dimensional accuracy, and moreover, it can be produced at low cost.
According to an aspect of the present invention, there is provided a connector for a fuel injection nozzle of an internal combustion engine, wherein the connector comprises a cylindrical fuel injection nozzle fitting portion having at one end thereof a flared portion diverging away from the fitting portion; a plate-shaped position determining portion formed integral with the fuel injection fitting portion at a predetermined position and extending outwardly from the flared portion, the plate-shaped position determining portion being bent outwardly to form an angle to an outer surface of the fuel injection nozzle fitting portion; and a delivery pipe connecting portion formed at another end of the cylindrical fitting portion having a diameter smaller than that of the cylindrical fitting portion.
According to another aspect of the present invention, there is provided a method of producing a connector for a fuel injection nozzle of an internal combustion engine, wherein the method comprises the steps of preparing an intermediate integral sheet metal product comprising a cylindrical fuel injection nozzle fitting portion including a bottom portion and a flared portion on an opposite side relative to the bottom portion of the cylindrical fitting portion by plastically forming a metal sheet blank; forming a delivery pipe connecting portion projecting outward from the bottom portion of the intermediate product to form a reduced diameter-cylindrical flange on the bottom portion; press-trimming the flared portion with the use of a forming die to give a predetermined diameter to the flared portion; integrally forming an outwardly projecting plate-shaped position determining portion on the flared portion when performing the press-trimming; and bending the position determining portion toward the cylindrical fitting portion.
According to a further aspect of the present invention, there is provided a method of producing a connector for a fuel injection nozzle of an internal combustion engine, wherein the method comprises the steps of firmly holding a metal sheet blank on a conical surface of a hole of a first die, which hole has a diameter corresponding to an outer diameter of a fuel injection nozzle fitting portion of the connector, the conical surface portion being formed successive to the hole; providing a first punch including a first rod-shaped portion having a diameter smaller than that of the hole, and a truncated-conical surface portion formed around a proximal end of the rod-shaped portion; plunging the first punch into the first die to cause the rod-shaped portion thereof to move into the hole of the first die and to cause the truncated-conical surface portion to move against the conical surface portion of the first die, thereby obtaining an intermediate product with the fuel injection nozzle fitting portion formed in the hole, an integral flared portion of the connector formed between the conical surface portion and the truncated-conical portion, and a bottom portion of the fuel injection nozzle fitting portion; forming a hole in the bottom portion of the thus formed fuel injection nozzle fitting portion; forming a delivery pipe connecting portion including a cylindrical flange extending outward from an area of the bottom portion around the hole; trimming the flared portion to give a predetermined diameter to the flared portion and to form a plate-shaped position determining portion extending radially outward from the trimmed flared portion; and bending the plate-shaped position determining portion toward an outer surface of the cylindrical fuel injection nozzle fitting portion.
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patent: 4414836 (1983-11-01), Saunders
patent: 4489584 (1984-12-01), Gall et al.
patent: 5072710 (1991-12-01), Washizu
patent: 5136999 (1992-08-01), Bassler et al.
patent: 5301647 (1994-04-01), Lorraine
patent: 5448832 (1995-09-01), Kanemitsu et al.
patent: 5492001 (1996-02-01), Sasaki et al.
patent: 5641126 (1997-06-01), Nally et al.
patent: 5735163 (1998-04-01), Sato et al.
patent
Cuda Rosenbaum I
Ladas & Parry
Nguyen T.
Sanoh Kogyo Kabushiki Kaisha
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