Internal-combustion engines – Combustion chamber means having fuel injection only – Air entering combustion chamber through plural inlets
Reexamination Certificate
1998-12-18
2001-03-06
Dolinar, Andrew M. (Department: 3747)
Internal-combustion engines
Combustion chamber means having fuel injection only
Air entering combustion chamber through plural inlets
C123S04182R
Reexamination Certificate
active
06196185
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates in general to internal combustion engines and more particularly to the internal combustion engines of a fuel direct injection spark ignition type that adapts a system for injecting fuel directly into the combustion chamber and igniting the air/fuel mixture in the chamber using a spark produced by a spark plug. More specifically, the present invention is concerned in an arrangement of intake ports formed in a cylinder head of such engines.
2. Description of the Prior Art
In providing a cylinder head of an internal combustion engine with two intake ports for each combustion chamber, it has been commonly employed that, due to the inherent separation from a single intake passage, the two intake ports are arranged to extend in parallel or extend while increasing a distance therebetween as nearing the combustion chamber.
Particularly, in the internal combustion engines of the above-mentioned type, it has been commonly employed that a fuel injector is arranged below and between the two intake ports, that is, at a peripheral side of the combustion chamber. This arrangement is shown in for example Japanese Patent First Provisional Publication 9-119344.
In this Publication, there is also disclosed a cooling water passage formed in the cylinder head near a lower portion of a fuel injector mounting bore. With this, a fuel injector installed in the mounting bore and fuel fed to the fuel injector are cooled during operation of the engine.
Beside, in Japanese Patent First Provisional Publication 6-101588, there is disclosed a system for suppressing over-heating of fuel injected by the fuel injector. That is, in the system, a return part of the fuel from the fuel injector is controlled in accordance with the temperature of the fuel fed to the fuel injector.
SUMMARY OF THE INVENTION
However, the arrangements disclosed by the above-mentioned publications have failed to exhibit satisfied performances due to the following reasons.
That is, the above-mentioned parallel and/or non-parallel arrangement of the two intake ports tend to induce an air flow dispersion in the combustion chamber. In this case, it is difficult to create a satisfied tumble air flow in the center of the cylinder, so that a fuel injected from the fuel injector in the compression stroke under a stratified charge combustion is not assuredly conveyed to the ignition plug and furthermore the fuel injected from the fuel injector in the intake stroke under a homogeneous charge combustion fails to produce a sufficiently homogeneous charge due to inadequate collision against the tumble flow.
Furthermore, the cooling measure and system disclosed by the publications have failed to exhibit a satisfied performance due to their inherent constructions. That is, in the cooling measure disclosed by the Publication 9-119344, a sufficient cooling of the fuel is not achieved. In the cooling system of the Publication 6-101588, a fuel temperature sensor and a complicated control unit are needed, which causes increase in cost of the system.
Thus, it is an object of the present invention to provide a fuel direct injection spark ignition type internal combustion engine which is free of the drawbacks possessed by the above-mentioned conventional engines.
According to a first aspect of the present invention, there is provided a fuel direct injection spark ignition type internal combustion engine, which comprises a combustion chamber; and a pair of intake ports extending to the combustion chamber. The intake ports are arranged to decrease a distance therebetween as nearing the combustion chamber. An axial center line of each intake port is inclined by an angle “&thgr;” relative to an imaginary plane which includes a center line of an associated piston and is perpendicular to an axial line of an associated crankshaft. The angle “&thgr;” satisfies the inequality of “0°<&thgr;≦15°”.
According to a second aspect of the present invention, there is provided a fuel direct injection spark ignition type internal combustion engine, which comprises a combustion chamber; and a pair of intake ports extending to the combustion chamber. The intake ports are arranged to decrease a distance therebetween as nearing the combustion chamber. An axial center line of each intake port is inclined by an angle “&thgr;” relative to an imaginary plane which includes a center line of an associated fuel injector and extends in parallel with a center line of an associated piston. The angle “&thgr;” satisfies the inequality of “0°<&thgr;≦15°”.
REFERENCES:
patent: 4958604 (1990-09-01), Hashimoyo
patent: 5894826 (1999-04-01), Jaye
patent: 197 13 030 A1 (1997-10-01), None
patent: 0 173 296 A2 (1986-03-01), None
patent: 0 235 121 A1 (1987-09-01), None
patent: 0 554 235 A1 (1993-08-01), None
patent: 0 601 612 A1 (1994-06-01), None
patent: 6-101588 (1994-04-01), None
patent: 9-119344 (1997-05-01), None
patent: 9-209760 (1997-08-01), None
Dolinar Andrew M.
Foley & Lardner
Nissan Motor Co,. Ltd.
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