Controlled air entrainment passage for diesel engines
First Claim
1. A system, comprisinga cooling passage for an engine positioned exterior to a cylinder bore and coupled to the cylinder bore at a first end, forming a first opening in the cylinder bore for receiving gasses from the cylinder bore, where the cooling passage is further coupled to the cylinder bore at a second end, forming a second opening in the cylinder bore for returning the gasses received from the cylinder bore via the first opening, back to the cylinder bore, wherein the cooling passage comprises a cooled air conduit, a fuel spray conduit, and a central air conduit, the cooled air conduit coupled at a first end to the cylinder bore and at an opposite second end to the fuel spray conduit for directing combustion chamber gasses from the cylinder bore to the fuel spray conduit, and where a first end of the fuel spray conduit is coupled to the cylinder bore and an opposite second end of the fuel spray conduit is positioned in front of a fuel injector such that a fuel spray axis is parallel to a central axis of the fuel spray conduit, for directing one or more of fuel sprays from the fuel injector and gasses from the cooled air conduit into the cylinder bore.
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Accused Products
Abstract
Systems are provided for cooling combustion chamber gasses and increasing an amount of air entrained in an injected fuel spray. In one example, a cooling passage may be included in an internal combustion engine, the cooling passage positioned exterior to a cylinder bore of the engine and coupled to the cylinder bore at a first opening and a second opening. The cooling passage may receive gasses from the cylinder bore via the first opening, and may cool the gasses as they travel through the cooling passage before returning the gasses to the cylinder bore via the second opening.
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Citations
20 Claims
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1. A system, comprising
a cooling passage for an engine positioned exterior to a cylinder bore and coupled to the cylinder bore at a first end, forming a first opening in the cylinder bore for receiving gasses from the cylinder bore, where the cooling passage is further coupled to the cylinder bore at a second end, forming a second opening in the cylinder bore for returning the gasses received from the cylinder bore via the first opening, back to the cylinder bore, wherein the cooling passage comprises a cooled air conduit, a fuel spray conduit, and a central air conduit, the cooled air conduit coupled at a first end to the cylinder bore and at an opposite second end to the fuel spray conduit for directing combustion chamber gasses from the cylinder bore to the fuel spray conduit, and where a first end of the fuel spray conduit is coupled to the cylinder bore and an opposite second end of the fuel spray conduit is positioned in front of a fuel injector such that a fuel spray axis is parallel to a central axis of the fuel spray conduit, for directing one or more of fuel sprays from the fuel injector and gasses from the cooled air conduit into the cylinder bore.
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7. A system for an engine, comprising;
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a cooling passage positioned exterior to a cylinder bore to provide fluidic communication between a fuel injector and a combustion chamber, the cooling passage coupled to the cylinder bore at a first end, forming a first opening in the cylinder bore for receiving gasses from the cylinder bore, and further coupled to the cylinder bore at a second end, forming a second opening in the cylinder bore for returning the gasses received from the cylinder bore via the first opening, back to the cylinder bore, the cooling passage including; a cone-shaped reservoir formed at a top of the cooling passage, in fluidic communication with a fuel injector; a fuel spray conduit coupled at one end to the cylinder bore and at an opposite end to an orifice of the fuel injector via the reservoir such that a central axis of the fuel spray conduit is parallel to a direction of fuel spray from the injector; a cooled air conduit coupled at one end to the cylinder bore and at an opposite end to the fuel spray conduit; and a central air conduit coupled at one end to the cylinder bore and at an opposite end to the reservoir. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. An engine comprising:
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a fuel injector located in a cylinder head comprising a fuel spray conduit aligned with each orifice of a plurality of fuel injector orifices arranged in a nozzle of the fuel injector, the fuel spray conduit oblique to a central axis of the fuel injector and a central axis of a combustion chamber; a central passage arranged radially interior to the fuel spray conduit, the central passage comprising a central axis aligned with the central axis of the combustion; and a cooler air passage arranged radially exterior to the fuel spray conduit, wherein the fuel spray conduit, the central passage, and cooler air passage are positioned above a fire deck and shaped to receive combustion chamber gases and inject a fuel mixture directly into the combustion chamber. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification