Internal-combustion engines – Charge forming device – Cooling of combustible mixture
Reexamination Certificate
2000-01-31
2001-02-06
McMahon, Marguerite (Department: 3747)
Internal-combustion engines
Charge forming device
Cooling of combustible mixture
Reexamination Certificate
active
06182643
ABSTRACT:
TECHNICAL FIELD
The present invention relates to internal combustion engines and, more particularly, to cooling systems within internal combustion engines.
BACKGROUND ART
Reciprocating piston internal combustion engines include one or more pistons that are reciprocally disposed within corresponding combustion cylinders. The pistons are interconnected with each other through the use of a rotatable crankshaft. Reciprocation of the pistons causes rotation of the crankshaft.
An internal combustion engine utilizes air and fuel to create combustion within the various combustion cylinders. Combustion causes movement of the piston within the combustion cylinder which is transferred to the crankshaft and other moving parts of the engine for various purposes. The combustion process generates heat that is transferred throughout the engine.
In order to maintain engine life, it is known to remove as much heat as possible from the engine. It is also known that providing cooled intake air will aid in improved efficiency, cleaner combustion and engine cooling.
However, providing cooled intake air, or cooling of any kind, generally requires at least auxiliary energy and components. This solution is not favorable since it adds weight to the system.
In U.S. Pat. No. 3,439,657 entitled “Cooling Devices for Supercharged Internal Combustion Engines” issued to Gratzmuller on Apr. 22, 1969, there is disclosed a cooling device and process for supercharged internal combustion engines. The device and process utilizes the water cooling circuit of the engine. The supercharger air inlet is provided with a pair of serially arranged heat-exchangers to lower the temperature of the supercharger air. The first heat-exchanger receives cooling liquid from a liquid cooling circuit that includes the water jacket of the engine. The second heat-exchanger is located in the air inlet between the engine and the first heat-exchanger and forms the part of a separate liquid cooling circuit provided with a circulation pump and air-cooled radiator.
There is thus the problem of providing cooled intake air for an internal combustion engine without adding appreciable weight or complexity to the system.
The present invention is directed to overcoming one or more of the problems as set forth above.
DISCLOSURE OF THE INVENTION
In one aspect of the invention, an internal combustion engine comprises an engine block having at least one combustion cylinder, an air intake port and an exhaust port each in communication with the combustion cylinder. A piston is reciprocatingly disposed within each combustion cylinder with an exhaust stack in communication with each exhaust port. A heat transfer system has a circuit tube with a first portion in heat transfer relationship with the exhaust stack and a second portion defining a heat conduction area, and a flow valve in the circuit tube. A cooling system has a circuit conduit with a first section defining a heat receiving area in thermal contact with the heat conduction area of the heat transfer system and a second section defining a cooling area, and a restriction in the circuit conduit between the first section and the second section upstream of the second section.
In another aspect of the invention, an internal combustion engine comprises an engine block having a combustion cylinder, an air intake port in communication with the combustion cylinder, an exhaust port in communication with the combustion cylinder, a piston reciprocatingly disposed in the combustion cylinder, an air intake tube in communication with the air intake port, and an exhaust tube in communication with the exhaust port. A heat transfer circuit has a first section disposed about the exhaust tube, a second section defining a heat transfer area, and a one-way flow valve. A cooling circuit has a first portion in thermal transfer relationship with the second section of the heat transfer circuit, a second portion disposed about the air intake tube, and an orifice between the first portion and the second portion upstream of the second portion.
In yet another aspect of the invention, an internal combustion engine comprises an engine block with a combustion cylinder therein, an air intake port in communication with the combustion cylinder, and an exhaust port in communication with the combustion cylinder. A piston is reciprocatingly disposed in the combustion cylinder, while an exhaust stack is in communication with the exhaust port. A first thermal transfer circuit having ammonia therein includes a heat receiving coil disposed about the exhaust stack, a one-way valve, and a heat transfer section. A second thermal transfer circuit having a refrigerant therein includes a cooling coil, an orifice disposed upstream of the cooling coil, and a heat absorption section upstream of the orifice. The heat absorption section is in thermal transfer relationship with the heat transfer section, wherein the refrigerant is adapted to produce cooling in the cooling coil.
REFERENCES:
patent: 2775961 (1957-01-01), Petre
patent: 3439657 (1969-04-01), Gratzmuller
patent: 3441011 (1969-04-01), Karl
patent: 3577961 (1971-05-01), Deutschmann et al.
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patent: 4429737 (1984-02-01), McManus et al.
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patent: 5172753 (1992-12-01), Kadle et al.
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patent: 5385132 (1995-01-01), Lehman
patent: 5394854 (1995-03-01), Edmaier et al.
Caterpillar Inc.
McMahon Marguerite
Taylor Todd T.
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