Boot and shoe making – Lasting-fastener removing machines
Reexamination Certificate
2001-01-10
2002-11-26
Argenbright, Tony M. (Department: 3747)
Boot and shoe making
Lasting-fastener removing machines
C123S508000, C123S509000
Reexamination Certificate
active
06484342
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fuel supply device for a direct injection internal combustion engine and, more particular, to a fuel supply device for supplying fuel to a direct injection internal combustion engine in which a layout of a high-pressure fuel pump is improved.
2. Description of Related Art
In a front engine-front drive (FF) type of vehicle, an engine is installed in a front engine compartment with a row of cylinders in a transverse direction of the vehicle. As known from, for instance, Japanese Unexamined Patent Application No. 8-312502, in the case where the front engine-front drive type of vehicle equipped with a direct injection type of internal combustion engine in which fuel is sprayed directly into cylinders, a fuel supply device includes fuel injectors and a high-pressure fuel pump which is used to pressurize fuel and force it into a fuel delivery pipe for distributing fuel to the fuel injectors for stable fuel supply into cylinders through the fuel injectors overcoming high pressure in the cylinders.
Typically, a camshaft or an extension of the camshaft extending beyond an engine in a transverse direction drives a high-pressure fuel pump. Fuel is pressurized by, for example, reciprocating motion of a rod of the high-pressure fuel pump, which is caused by rotation of a cam secured to the camshaft. Because the front engine-front drive type of vehicle is equipped with an internal combustion engine with a row of cylinders directed in a transverse direction of the vehicle and, as a matter of course, the camshaft extends in the transverse direction, the high-pressure fuel pump is located laterally adjacent to the top of the transverse engine.
As schematically shown as one of general arrangements of intake and exhaust systems in
FIG. 9
, an intake system P
2
is located behind a transverse direct injection engine P
10
and an exhaust system P
3
is located in front of the engine. Further, as schematically shown as another general arrangement of intake and exhaust systems in
FIG. 10
, an intake system P
2
is located in front of engine P
10
and an exhaust system P
3
is located behind the engine. The latter arrangement makes it possible to have the exhaust system P
3
shortened in exhaust gas path length for the purpose of quickly raising a temperature of a catalytic converter in the exhaust system P
3
and accelerating activation of the catalyst which is quite notable in light of measures to meet the recent exhaust gas regulations.
In both arrangements, a high-pressure fuel pump P
50
is located laterally adjacent to rear part of the top of the transverse engine so as to avoid mechanical interference against a front hood Pz that is inclined forward down. A camshaft extending from rear top portion of the engine body P
10
drives the high-pressure fuel pump P
50
. Specifically, the high-pressure fuel pump P
50
is driven by an intake camshaft P
14
in the case where the intake system P
2
is located behind the engine P
2
as shown in
FIG. 9
, or the high-pressure fuel pump is driven by an exhaust camshaft P
15
in the case where the exhaust system P
3
is located behind the engine body P
10
as shown in FIG.
10
.
There is provided a distance between the high-pressure fuel pump P
50
and a dash panel Pg when disposing the high-pressure fuel pump P
50
a little to the rear of the engine P
10
shorter than that when disposing the high-pressure fuel pump P
50
a little to the front of the engine body P
10
and driving it by a camshaft extending along froward top portion of the engine body P
10
. The shorter distance between the high-pressure fuel pump P
50
and a dash panel Pg provides an increase in probability of damaging the high-pressure fuel pump P
50
due to a hit against the dash panel Pg which is caused by rearward movement of the engine body P
10
upon an occurrence of a frontal crash of the vehicle. In particular, differently from the arrangement in which the engine body P
10
with the intake system P
2
located behind the engine and the exhaust system P
3
located in front of the engine as shown in
FIG. 9
, a surge tank P
22
is not located between the high-pressure fuel pump P
50
and the dash panel Pg in the arrangement in which the engine body P
10
with the intake system P
2
located in front of the engine and the exhaust system P
3
located behind the engine as shown in FIG.
10
. Accordingly, the high-pressure fuel pump P
50
and the dash panel Pg stand face to face directly with each other, so that the high-pressure fuel pump P
50
is apt to easily hit against the dash panel Pg when the engine moves backward. This arrangement is undesirable for structural safety.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a fuel supply device having a compact arrangement which prevents a high-pressure fuel pump from mechanically interfering with a hood of an engine compartment and provides a large distance between the high-pressure fuel pump and a structural member such as a dash panel behind the high-pressure fuel pump in consideration with prevention of an impact possibly applied to the high-pressure fuel pump upon occurrence of a frontal crash of the vehicle.
The foregoing object of the present invention is accomplished by providing a fuel supply device for a direct injection internal combustion engine with a row of cylinders directed in a transverse direction of a vehicle body for supplying fuel to fuel injectors adapted to spray fuel directly into cylinders, which comprises at least two camshafts extending in parallel to each other along the engine in the transverse direction and a high-pressure fuel pump for pressurizing said fuel and forcing it into the fuel injector. The high-pressure fuel pump is located laterally adjacent to front or rear part of the engine so as to be driven by one of the two camshafts located along the part of the engine and is installed in a position inclined forward or rearward.
According to the fuel supply device, in an arrangement wherein the high-pressure fuel pump E
50
is located laterally adjacent to forward part of the engine body E
10
and is driven by one of the two camshaft E
14
which is located along the forward part of the engine body E
10
as schematically shown in
FIG. 7
, because the high-pressure fuel pump P
50
is not in an upright position but is inclined rearward, the high-pressure fuel pump E
50
shifts rearward in position from the upright position, so that the high-pressure fuel pump E
50
is prevented from mechanically interfering with the hood of engine compartment Ez though it is located in a forward position with respect to the engine body E
10
. Additionally, the high-pressure fuel pump E
50
is intentionally positioned forward with respect to the engine body E
10
in the engine compartment Ex, so that there is provided a long distance between the high-pressure fuel pump E
10
and the dash panel Eg behind the high-pressure fuel pump E
50
, thereby lowering energy of an impact applied to the high-pressure fuel pump E
50
by the dash panel Eg when the engine body E
10
moves rearward upon an occurrence of frontal crash of the vehicle.
On the other hand, in an arrangement wherein the high-pressure fuel pump E
50
is located laterally adjacent to rearward part of the engine body E
10
and is driven by one of the two camshaft E
15
which is located along the rearward part of the engine body E
10
as schematically shown in
FIG. 8
, because the high-pressure fuel pump P
50
is not in an upright position but is inclined forward, the high-pressure fuel pump E
50
shifts forward in position from the upright position, so that there is provided a long distance between the high-pressure fuel pump E
10
and the dash panel Eg behind the high-pressure fuel pump E
50
even though it is located in a rearward position with respect to the engine body E
10
thereby lowering energy of an impact applied to the high-pressure fuel pump E
50
by the dash panel Eg when the engine body E
10
moves rearward upon an occurrence of frontal cr
Goto Tsuyoshi
Shimizu Isao
Takasaki Nobuaki
Argenbright Tony M.
Brooks & Kushman P.C.
Mazda Motor Corporation
Smith Rebecca A
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