Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
1999-09-22
2001-05-08
Moulis, Thomas N. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S468000, C123S469000
Reexamination Certificate
active
06227169
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application relates to and incorporates herein by reference Japanese patent application No. 10-290824 filed on Oct. 13, 1998.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fuel supply system for internal combustion engines which has an improved fuel leakage restricting structure.
2. Related Art
A cylinder direct injection type fuel supply system has been proposed for an automotive vehicle gasoline internal combustion engine as shown in
FIG. 6A
, to improve engine efficiency for environmental protection. In this system, a fuel delivery pipe
1
is connected to a high pressure fuel pump (not shown) via a fuel pipe
2
. A fuel injector
4
for each cylinder is mounted on an engine cylinder head
5
so that fuel is directly injected into a combustion chamber. The injector
4
is coupled with the delivery pipe
1
via a rubber sealing member such as an O-ring
3
. A high pressure fuel injection is attained by the injector
4
to improve fuel spray atomization. It is important to ensure sealing property in the fuel supply system.
The rubber sealing member
3
fitted between the delivery pipe
1
and the injector
4
tends to change its sealing characteristics largely depending on changes in surrounding temperature. Further, the delivery pipe
1
bows in response to the high fuel pressure by an amount of flexing &dgr; as shown in FIG.
6
(B). As a result, use of the rubber sealing member
3
is limited by surrounding conditions (fuel pressure, temperature, etc.).
SUMMARY OF THE INVENTION
It is an object of the present invention to restrict fuel from leaking through a sealing part in a fuel supply system for internal combustion engines.
According to a first aspect of the present invention, a delivery pipe is divided into a plurality parts and adjacent two of the pipe parts of the delivery pipe are coupled with each other at a connecting part having a substantially the same fuel passage diameter as that of the delivery pipe. A flexible sealing member is disposed in the connecting part.
According to a second aspect of the present invention, a coupling member is provided between a delivery pipe and an injector so that the coupling member is coupled flexibly with both of the delivery pipe and the injectors.
According to a third aspect of the present invention, a cushioning member having a sealing property is inserted between an injector and a cylinder head to couple the injector with the cylinder head flexibly.
According to a fourth aspect of the present invention, a fuel passage communicated with a high pressure pump is formed in a cylinder head to supply fuel heated by the cylinder head to an injector.
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patent: 5168856 (1992-12-01), Lorraine
patent: 5511527 (1996-04-01), Lorraine et al.
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Kohama Tokio
Saito Kimitaka
Sato Yasuyuki
Yano Masaaki
Moulis Thomas N.
Nippon Soken Inc.
Nixon & Vanderhye PC
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