Internal-combustion engines – Adjustable combustion chamber – Piston in head adjusted
Patent
1990-09-13
1991-06-25
Okonsky, David A.
Internal-combustion engines
Adjustable combustion chamber
Piston in head adjusted
123 78R, F02B 7504
Patent
active
050257579
ABSTRACT:
A reciprocating piston internal combustion engine with a varying compression ratio comprises a block having at least one piston bore, a piston received in each bore, a head attached to the block and having a dome portion closing the top of each bore and defining with the piston a compression volume when the piston is at top dead center in the bore, a crankcase, a crank rotatably mounted in the crankcase, and a connecting rod coupling each piston to the crank. The block is mounted on the crankcase for pivotal movement about a pivot axis parallel to and spaced apart from the axis of the crank such that the size of the compression volume varies in accordance with the extent of the pivotal movement of the block about the pivot axis. An actuator connected between the block and the crankcase pivots the block about the pivot axis relative to the crankcase in response to at least one signal indicative of at least one operating parameter of the engine.
REFERENCES:
patent: 1343536 (1920-06-01), Weeks
patent: 3868931 (1975-03-01), Dutry et al.
patent: 4419969 (1983-12-01), Bundrick
patent: 4876992 (1989-10-01), Sobotowski
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