Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2003-07-24
2004-12-14
Mohanty, Bibhu (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
Reexamination Certificate
active
06830036
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application is related to and incorporates herein by reference Japanese Patent Applications No. 2002-218050 filed on Jul. 26, 2002, No. 2002-332450 filed on Nov. 15, 2002 and No. 2003-123621 filed on Apr. 28, 2003.
FIELD OF THE INVENTION
The present invention relates to a fuel supply apparatus, which resiliently presses a fuel injector to the cylinder head of an internal combustion engine.
BACKGROUND OF THE INVENTION
Various fuel supply apparatuses are provided for injecting fuel transferred by a fuel transfer pipe into a cylinder of an internal combustion engine by a fuel injection device (injector). In some fuel supply apparatuses, one end of the injector on a side of a fuel injection port and the other end thereof on a side of a fuel flow inlet are respectively inserted in to a cylinder head and the fuel transfer pipe of the engine.
For example, according to an apparatus disclosed in JP-A-11-287168, a pressing member comprising a leaf spring is fixed to a cylinder head along with a stay provided at a fuel transfer pipe and an injector is pressed to a cylinder head by the pressing member.
According to this apparatus, between the fuel transfer pipe and the cylinder head, the pressing member is fixed to the cylinder head by a bolt. Therefore, when a fuel supply apparatus is integrated to inside of a V-bank of the cylinder head as shown, a space cannot sufficiently be ensured at a surrounding of a bolt fixing portion. In this case, it is difficult to fasten the bolt. Therefore, cost required for integration is increased and the magnitude of the axial force of the bolt cannot be achieved as expected. Particularly, since a press force for pressing the injector is obtained by resiliently deforming the pressing member comprising the leaf spring by the axial force of the bolt, a reduction in the axial force leads to a reduction in the pressing force. In the case of the leaf spring having a short free length, the spring constant must be set to be large in order to ensure the press force. Therefore, the press force is considerably reduced even by a slight reduction in the axial force.
Further, according to another apparatus shown in
FIG. 16
, a cylinder head
100
is fixed with a clamp member
102
and an injector
104
is pressed to the cylinder head
100
by the clamp member
102
.
According to this apparatus, a middle portion
102
b
of the clamp member
102
is fixed to the cylinder head
100
by a bolt in a state of bringing one end
102
a
of the clamp member
102
into contact with the cylinder head
100
and the other end
102
c
of the clamp member
102
is engaged with an injector
104
. Thereby, a lever comprising the one end
102
a
, the middle portion
102
b
and the other end
102
c
of the clamp member
102
respectively functions as a fulcrum. The injector
104
is pressed by the end
102
c
of the clamp member
102
. The clamp member
102
utilized as the lever in this way needs to be highly rigid and therefore, the clamp member
102
becomes expensive.
Further, in order to fix the injector
104
to be durable against high combustion pressure in the engine, the distance between the end
102
a
and the middle portion
102
b
of the clamp member
102
needs to be long based on a lever ratio. Therefore, a large space needs to be ensured for arranging the clamp member
102
to deviate from a center axis of the injector
104
to one side in a diametric direction and depending on a shape of the cylinder head
100
, arranging the clamp member
102
may become difficult.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a fuel supply apparatus reducing cost required for integrating to a cylinder head of an engine.
It is another object of the invention to provide a fuel supply apparatus capable of easily and solidly integrating to a cylinder head of an engine.
It is a further object of the invention to provide an integrating part preferable for easily and solidly integrating a fuel supply apparatus to a cylinder head of an engine.
It is a still further object of the invention to provide a fuel supply apparatus requiring a small space for integrating to a cylinder head of an engine.
According to the first aspect of the present invention, a fuel supply apparatus has a fuel injection device, a fuel transfer pipe, a restricting member for restricting the fuel transfer pipe and a cylinder head from being separated from each other, and a pressing member interposed between the fuel transfer pipe and the fuel injection device. The pressing member receives a restricting force of the restricting member for pressing the fuel transfer pipe to a side opposing the cylinder head and pressing the fuel injection device to a side of the cylinder head by a reaction force against the restricting force.
According to the second aspect of the present invention, a fuel supply apparatus has a fuel injection device and a resilient integrating member for integrating the fuel injection device to a cylinder head. The integrating member includes a first pressing portion and a second pressing portion. The first pressing portion is fixed to the cylinder head for pressing the second pressing portion by being deformed resiliently. The second pressing portion is arranged between an insertion portion of the fuel injection device inserted in the insertion port and the insertion portion for pressing a projection projected from the insertion portion to an outer side in a diametric direction to a depth side of the insertion port by receiving a pressing force of the first pressing portion.
According to the third aspect of the present invention, a fuel supply apparatus has a fuel injection device and a resilient integrating member for integrating the fuel injection device to a cylinder head. The cylinder head has an insertion port as a locking portion by an inner wall thereof. The integrating member is locked by the locking portion to receive a reaction force and presses the fuel injection device to a depth side of the insertion port by the reaction force.
REFERENCES:
patent: 6338333 (2002-01-01), Brosseau et al.
patent: 6431151 (2002-08-01), Gmelin
patent: 6481421 (2002-11-01), Reiter
patent: 6772736 (2004-08-01), Liskow
patent: 1 134 406 (2001-09-01), None
patent: 11-287168 (1999-10-01), None
Oguma Yoshitomo
Okajima Masahiro
Shibata Hitoshi
Sugiura Shinji
Yamamoto Kazuo
Denso Corporation
Mohanty Bibhu
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