Rotary internal combustion engine with unequal volumetric ratios
AssigneePratt & Whitney Canada Corp.
InventorsSerge Dussault, Andre Julien, Michael Lanktree, Edwin Schulz
Life of this patent
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Abstract
A rotary internal combustion engine including a rotor assembly where at least a first and a second of the combustion chambers have unequal theoretical volumetric ratios. Also, a rotary internal combustion engine including first and second rotor assemblies where at least one of the combustion chambers of the first rotor assembly and at least one of the combustion chambers of the second rotor assembly have unequal effective volumetric compression ratios and/or unequal effective volumetric expansion ratios.
Claims20
A rotary internal combustion engine comprising:
- a housing having a rotor cavity;
- and
- a rotor received in the rotor cavity and cooperating with the housing to define combustion chambers in the rotor cavity, each of the combustion chambers having a respective working volume that is variable, each of the combustion chambers having a theoretical volumetric ratio defined as a ratio of a maximum value of the respective working volume to a minimum value of the respective working volume throughout one revolution of the rotor,
- wherein at least a first and a second of the combustion chambers have unequal theoretical volumetric ratios,
- wherein a first theoretical volumetric ratio of the at least first of the combustion chambers is at most 8.2.
A rotary internal combustion engine comprising:
- an engine shaft;
- at least first and second rotor assemblies each including:
- a housing having a rotor cavity and having an inlet port and an exhaust port in communication with the rotor cavity, and
- a rotor engaged to the engine shaft and received in the rotor cavity, the rotor cooperating with the housing to define combustion chambers in the rotor cavity, each of the combustion chambers having a respective working volume, each of the combustion chambers having an effective volumetric compression ratio determined by a first variation in the respective working volume during a compression phase of the combustion chamber and by a position of the inlet port, and an effective volumetric expansion ratio determined by a second variation in the respective working volume during an expansion phase of the combustion chamber and by a position of the exhaust port;
- wherein at least one of the combustion chambers of the first rotor assembly and at least one of the combustion chambers of the second rotor assembly have one or both of unequal effective volumetric compression ratios and unequal effective volumetric expansion ratios,
- wherein a first effective compression ratio and/or a first effective expansion ratio of the at least one of the combustion chambers of the first rotor is at most 8.2.
Dependencies are inferred from the claim text.