Two cycle engine with valved pressure scavenging
AssigneeGeneral Motors Corporation
InventorsRonald J. Cantrell, Edward D. Klomp, Edward G. Groff, James G. Solomon, Michael J. Gorman
Life of this patent
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Abstract
A port scavenged two cycle engine with a separate source of pressurized air has a valve between each port and the air supply to provide a high blowdown pulsing scavenging flow to the cylinders similar to that of a crankcase scavenged engine. Various arrangements with additional features are disclosed.
Claims9
A two cycle engine having multiple cylinders, each with an inlet port and a reciprocable piston operative to open and close the inlet port, pressurized air supply means connected via separate passages with the inlet ports of the cylinders for delivering pressurized scavenging and charging air to the cylinders, and a valve in each of the passages and spaced from their respective inlet ports to additionally control the supply of pressurized air to the passage portions adjacent the respective inlet ports, wherein
- each said valve is timed to be open during an initial scavenging interval after port opening and a final charging interval before port closing by the piston and said valve is timed to be closed during the intermediate period in which the port is open to limit the supply of pressurized air to the initial scavenging and final charging intervals.
A two-cycle engine having multiple cylinders, each with an inlet port and a reciprocable piston operative to open and close the inlet port, pressurized air supply means connected via separate passages with the inlet ports of the cylinders for delivering pressurized scavenging and charging air to the cylinders, and a valve in each of the passages and spaced from their respective inlet ports to additionally control the supply of pressurized air to the passage portions adjacent the respective inlet ports, and further comprising
- a separate air chamber for each cylinder between said valves and their associated inlet ports, each said valve being operative to admit charges of pressurized air to its respective air chamber during periods when the respective inlet port is closed, said changes to be discharged into the associated cylinder in a pulsing flow after each opening of the respective inlet ports.
Dependencies are inferred from the claim text.