Internal-combustion engines – Cooling – With jacketed head and/or cylinder
Reexamination Certificate
2000-11-09
2002-11-19
Kamen, Noah P. (Department: 3747)
Internal-combustion engines
Cooling
With jacketed head and/or cylinder
C123S041790
Reexamination Certificate
active
06481392
ABSTRACT:
RELATED PATENT APPLICATIONS
This patent application claims priority to Swedish Patent Application No. 9904101-4 filed Nov. 12, 1999.
TECHNICAL FIELD
The present invention relates to an internal combustion engine including a cylinder block with at least one cylinder and at least one intake and exhaust valve per cylinder. A cooling system is included that has an inlet opening formed in the cylinder block and leads to a first coolant space in the cylinder block. At least one restriction element is arranged in the first coolant space and a second coolant space is arranged in a cylinder head. Inlet ports are arranged in the cylinder head which connect the first and second coolant spaces to one another and are principally situated on an exhaust side of the cylinder head.
BACKGROUND OF THE INVENTION
An internal combustion engine with a cooling system is known from U.S. Pat. No. 5,558,048. The coolant is introduced into the cylinder block and is conveyed to the intake side of the cylinder block by means of a restriction element. The coolant bypasses the cylinders in the cylinder block and passes on to the cylinder head by way of an opening. The coolant is also allowed, however, to flow through slits, which are formed between respective cylinders. Each slit has a connection to a coolant port which opens out between respective cylinders in the cylinder head.
In internal combustion engines with a cooling system of this type, the cooling of the area between the exhaust valve seats for each cylinder in the cylinder head is often deficient because the geometry of the cylinder head is often designed so that the rate of flow of the coolant is low in the area between the exhaust valve seats.
The document SE-C2-509,077 shows an internal combustion engine that is provided with a cooling system and which is designed so that the coolant's rate of flow is high in the area between the exhaust valves seats. This is achieved by coolant ports that open out into the cylinder head in an area between the exhaust valve seats for each cylinder.
Some engines are provided with a fuel injector that extends directly into the cylinder. Thus the fuel will be injected directly into the cylinder. The area around the injector becomes very hot, which means that electronics arranged in the injector may be damaged by the large amount of heat developed.
Neither of the above-mentioned documents discloses an internal combustion engine with a cooling system that is adapted for cooling a fuel injector.
In view of the above described deficiencies associated with conventionally designed internal combustion engines, the present invention has been developed. These enhancements and benefits are described in greater detail hereinbelow with respect to several alternative embodiments of the present invention.
SUMMARY OF THE INVENTION
The present invention in its several disclosed embodiments alleviates the drawbacks described above with respect to conventionally designed internal combustion engines and incorporates several additional beneficial features.
One benefit of the present invention is the achievement of satisfactory cooling of a fuel injector that is arranged on an intake side of the internal combustion engine. Another is the achievement of a substantially even coolant flow around each cylinder of the engine that creates a satisfactory and even cooling of cylinders and cylinder liners and thereby obtains substantially the same optimum combustion temperature in each cylinder. Still further, the invention counteracts cylinder and cylinder liner deformation.
According to the invention, these and other objects are achieved by means of outlet ports arranged in the cylinder head which connect the first and second coolant spaces to one another. The outlet ports are principally situated on an intake side of the cylinder head. Further, an outlet opening is formed in the cylinder block which has a connection to the first coolant space.
An internal combustion engine with such a cooling system creates satisfactory and even cooling of the cylinders and the cylinder liners. At the same time, a satisfactory cooling of the engine fuel injector is obtained since the outlet ports are situated on the intake side of the engine. Among other things, this facilitates stoichiometric combustion at high load.
REFERENCES:
patent: 2710602 (1955-06-01), Maybach
patent: 4569313 (1986-02-01), Nobu
patent: 4759317 (1988-07-01), Ampferer
patent: 5558048 (1996-09-01), Suzuki et al.
patent: 0208416 (1987-01-01), None
patent: 0466551 (1992-01-01), None
patent: 0512600 (1992-11-01), None
patent: 0870918 (1998-10-01), None
patent: 509077 (1998-11-01), None
Howrey Simon Arnold & White , LLP
Kamen Noah P.
Volvo Personvagner AB
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