Internal-combustion engines – Combustion chamber means having fuel injection only – Having a particular relationship between injection and...
Reexamination Certificate
1998-05-22
2001-06-05
Moulis, Thomas N. (Department: 3747)
Internal-combustion engines
Combustion chamber means having fuel injection only
Having a particular relationship between injection and...
C239S087000
Reexamination Certificate
active
06240897
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention is related to a fuel injection valve and in particular to one with a movable valve seat.
2. Description of the Prior Art
In conventional four-stroke internal combustion engines, the electromagnetic fuel injection valve is mounted in the intake manifold and the pressure at the outlet of the injection valve is lower or equal to the atmospheric pressure, so that a low pressure fuel injection system (about 2-3 kg/cm
2
) will suffice for efficient working.
However, for two-stroke internal combustion engines, it is proposed to inject fuel or fuel-air mixture after the exhaust port is closed, in order to reduce the amount of fuel leaking into the exhaust pipe at the time of scavenging. Hence, it is necessary to mount the injection fuel valve on the cylinder. Although a high pressure injection system is workable in this case, it will increase the cost. If a low pressure injection system is used, it is necessary to use a mushroom valve in order to prevent the gas from flowing reversely into the fuel system, as described in U.S. Pat. No. 4,986,247, Kushibe et al 1/1991, and U.S. Pat. No. Re. 34,945 Sayer et al 5/1995. Although the air auxiliary fuel injection valve can promote the atomization of fuel, it is still impossible to obtain the optimum fuel distribution.
Therefore, it is an object of the present invention to provide an improved fuel injection valve which can obviate and mitigate the above-mentioned drawbacks.
SUMMARY OF THE INVENTION
This invention is related to an improved fuel injection valve and in particular to one with a movable valve seat.
It is the primary object of the present invention to provide an improved fuel injection valve which is low in cost in comparison with those adapted for use in high pressure fuel injection system.
It is another object of the present invention to provide an improved fuel injection valve which is mounted on the cylinder head for directly ejecting fuel or mixture into the cylinder.
It is still another object of the present invention to provide an improved fuel injection valve including a needle valve and a movable valve seat which will push the needle valve in an opposite direction to prevent high pressure gas from flowing reversely into the fuel system.
It is still another object of the present invention to provide an improved fuel injection valve which may be adapted to a single-hole or multi-hole ejecting orifice to mix air with fuel in correct proportions and obtain good dispersity.
It is still another object of the present invention to provide an improved fuel injection valve which is fit for use with liquid or gas fuel and the injection of which can be accurately controlled.
It is a further object of the present invention to provide an improved fuel injection valve which is externally connected to other fuel valve or air valve so as to mix fuel or fuel-air mixture into the cylinder.
Other objects of the invention will in part be obvious and in part hereinafter pointed out.
The invention accordingly consists of features of constructions and method, combination of elements, arrangement of parts and steps of the method which will be exemplified in the constructions and method hereinafter disclosed, the scope of the application of which will be indicated in the claims following.
REFERENCES:
patent: 2740667 (1956-04-01), Dickson et al.
patent: 4197996 (1980-04-01), Giardini
patent: 4776516 (1988-10-01), Klomp
patent: 5484104 (1996-01-01), Kukler
patent: 5820099 (1998-10-01), Rahbar et al.
Dougherty & Troxell
Moulis Thomas N.
LandOfFree
Fuel injection valve with a movable valve seat does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fuel injection valve with a movable valve seat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fuel injection valve with a movable valve seat will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2525701