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US 9,617,854 B2Granted
Hybrid vehicles with radial engines
OwnerTai Dung Nguyen, Tue Nguyen +1inventors
InventorsTai Dung Nguyen, Tue Nguyen, Donald James Duncalf
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Abstract
A radial cam engine with an optimized cam configuration can provide improve performance over crankshaft internal combustion engines. The cam configuration can include a flat-top or flat bottom piston motion, multiple lobe cam configurations, matching piston force with torque/force ratio in combustion phase, asymmetry piston motions for improved power transfer during combustion phase, and/or offset piston and cam configurations. The radial cam engine can be used in vehicles, such as hybrid vehicles.
Claims20
An engine comprising
- a piston,
- a cam coupled to a camshaft,
- wherein the cam is configured to provide a piston motion that comprises a substantially flat portion at or near a top or a bottom of the piston motion,
- wherein the substantially flat portion comprises an x3 or higher polynomial dependency.
1 more element
An engine comprising
- a piston,
- a cam coupled to a camshaft,
- wherein the cam is configured to provide a force profile of the piston that is substantially similar to a torque/force ratio profile of the camshaft at least in a first duration, wherein the first duration is between a top-dead-center position of the piston to an inflection point of the piston motion.
An engine comprising
- a piston,
- a cam coupled to a camshaft,
- wherein the cam is configured to provide a force profile of the piston that is substantially zero at a position of the piston motion in which a force acting on the piston changes sign,
- wherein the cam is configured to provide a force profile of the piston that is substantially zero at least a position of the piston motion in which a force acting on the piston changes sign.
1 more element
Dependencies are inferred from the claim text.