Cylinder head for direct fuel injected engine

Details Cylinder head for direct fuel injected engine Cylinder head for direct fuel injected engine

1999-11-15

2001-10-02

Argenbright, Tony M. (Department: 3747)

Internal-combustion engines

Cooling

With jacketed head and/or cylinder

C123S041310, C123S193500, C123S1950HC

Reexamination Certificate

active

06295956

ABSTRACT:

PRIORITY INFORMATION
This application is based on and claims priority to Japanese Patent Application No. 10-323258 filed Nov. 13, 1998, the entire contents of which is hereby expressly incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a cylinder head for a direct fuel injected engine, and more particularly to an improved cylinder head in which heat is distributed uniformly therein.
2. Description of Related Art
In all fields of engine design, there is an increasing emphasis on obtaining more effective emission control, better fuel economy and, at the same time, continued high or higher power output. This trend has resulted in the substitution of fuel injection systems for carburetors as the engine charge former. In the common systems conventionally used, fuel is injected into an intake air manifold.
In order to obtain still further improvement, direct injection systems are being considered. These systems inject fuel directly into a combustion chamber and thus have significant potential advantages. With direct fuel injection systems, the fuel must be injected directly into the combustion chamber, and consequently a fuel injector is disposed on a cylinder head that defines the combustion chamber.
When an engine charge is burnt in the combustion chamber, extremely high temperature is generated and conducted to the cylinder head. The cylinder head, therefore, has a water jacket therein to remove the heat promptly. However, because the fuel injector is disposed onto the cylinder head as noted above, it is likely to displace the water jacket in a portion of the cylinder head. The portion of the cylinder head that bears the fuel injector, thus, hold heat more than the other portions. The temperature distribution in the cylinder head thus is not uniform.
The cylinder head encircles a primary portion of the combustion chamber. As a result, the combustion state in the combustion chamber tends to be unstable, i.e., inconsistent. The engine consequently runs rough. This tendency is noticeable if the fuel injector is not positioned directly above the center of the combustion chamber.
SUMMARY OF THE INVENTION
A need therefore exists for a cylinder head of a direct fuel injected engine that is configured to improve uniform temperature distribution within the associated combustion chamber(s) to promote a stable combustion state under all normal operating conditions.
In accordance with one aspect of the present invention, a direct fuel injected, internal combustion engine comprises a cylinder body defining at least one cylinder bore in which a piston reciprocates. A cylinder head is affixed to an end of the cylinder body for closing the cylinder bore and defining, together with the piston and the cylinder bore, a combustion chamber. A fuel injector is arranged to spray fuel directly into the combustion chamber. The cylinder head has a coolant jacket through which coolant flows. The fuel injector is positioned at one side of the cylinder head in the cooling jacket. At least one rib of the cylinder head is disposed generally opposite of the fuel injector. This cooling rib provides enhanced cooling to the side of the cylinder head, and consequently to the side of the combustion chamber opposite of the fuel injector position. In this manner, the cooling effect of the injected fuel on the fuel injector side of the combustion chamber are generally counter-balanced by the cooling effect provided by the rib so as to provide more uniform heat distribution in the combustion chamber, and hence, a more stable combustion state.
In accordance with another aspect of the present invention, a direct fuel injected, internal combustion engine comprises a cylinder body defining at least one cylinder bore in which a piston reciprocates. A cylinder head member is affixed to an end of the cylinder body for closing the cylinder bore and defining with the piston and the cylinder bore a combustion chamber. A fuel injector is arranged to spray fuel directly into the combustion chamber. The fuel injector is disposed in an injector boss positioned on the cylinder head member. A cylinder head cover member defines a coolant passage with the cylinder head member therebetween. A plurality of ribs are projected into the coolant passage from the cylinder head member. One of the ribs extends from the injector boss.
Further aspects, features and advantages of the invention will become apparent from the detailed description of the preferred embodiment which follows.


REFERENCES:
patent: 4106444 (1978-08-01), Deutschmann et al.
patent: 5983843 (1999-11-01), Suzuki et al.

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