Adjustable rotary valve assembly for a combustion engine
OwnerDavid F. Coffininventor
Life of this patent
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Abstract
A rotary valve assembly is provided for use in a combination engine, wherein the valve assembly is adjustable for variable valve timing during engine operation. The rotary valve assembly comprises a rotary valve plate formed by a pair of valve leaves mounted coaxially in overlapping relation and defining an open arcuate valve port. The valve plate is rotatably mounted to extend across and thereby open and close an engine valve passage, such as an intake passage in a two-stroke combustion engine. An adjustment sleeve is provided to rotate the valve leaves during engine operation to rotate the valve leaves during engine operation in response to one or more selected engine operating conditions, to correspondingly and selectively adjust the engine valve timing.
Claims19
A rotary valve assembly for a combustion engine, comprising:
- a rotary valve plate defined by a coaxially mounted pair of valve leaves cooperatively defining an arcuate open valve port;
- means for mounting said valve plate on the engine to extend across an engine valve passage;
- means for rotatably driving said valve plate in response to engine operation whereby said valve port is rotated across the engine valve passage to open the valve passage;
- and
- means for rotatably adjusting the position of said valve leaves relative to said driving means to adjust engine valve timing.
A rotary valve assembly for a combustion engine, comprising:
- a rotary valve plate defined by a coaxially mounted pair of valve leaves cooperatively defining an arcuate open valve port, said valve leaves including axially overlapping trailing edge segments;
- and
- means for rotatably displacing said valve leaves relative to each other to adjust the arcuate span of said valve port.
A rotary valve assembly for a combustion engine, comprising:
- a rotary valve plate defined by a pair of valve leaves each including a central hub, said hubs of said valve leaves respectively defining a pair of helical splines and being coaxially mounted to coaxially support said valve leaves, said valve leaves having axially overlapping trailing edges and arcuately separated leading edges defining an open arcuate valve port;
- means for rotatably driving said valve plate in response to engine operation, with said valve plate extending across an engine valve passage whereby the valve passage is opened to gas flow each time the valve port is aligned therewith;
- an adjustment sleeve driven rotatably by the engine and including a pair of lands formed respectively to define helical spline segments meshed respectively with said helical splines on said hubs;
- and
- means for axially displacing said adjustment sleeve within the limits of a defined stroke for adjusting the positions of said valve leaves to adjust engine valve timing.
Dependencies are inferred from the claim text.