Internal-combustion engines – Four-cycle – Single poppet valve
Patent
1992-09-11
1993-04-27
Okonsky, David A.
Internal-combustion engines
Four-cycle
Single poppet valve
123658, 123265, 60304, F02B 7532
Patent
active
052052460
ABSTRACT:
The invention presents new and useful improvements in the mechanical design of control elements used in the sequencing of the exhaust and intake process cycles of the 4-stroke reciprocating piston engine. The exhaust and induction circuits pass through the same valve port and their flows are alternately controlled by the same poppet valve. The camshaft exhaust and intake lobes are combined into a single broad double-cycle lobe such that the poppet valve remains fully open at the end of the exhaust stroke permitting the intake stroke to begin with the poppet valve in the same fully open position without the attendant problem of exhaust gas dilution of the air charge entering the engine, as most generally associated with valve overlap in the conventional sequencing method using two poppet valves.
The simplification of having only one poppet valve, one valve port, and one cam lobe per each engine cylinder reduces the engine manufacturing cost. The ability to complete the exhaust stroke and begin the intake stroke with the poppet valve in the fully open position increases the systems volumetric efficiency and reduces the pumping work, thus improving the engines specific fuel consumption.
REFERENCES:
patent: 4103664 (1978-08-01), Iida et al.
patent: 4108119 (1978-07-01), McWhorter
patent: 4125105 (1978-11-01), May
patent: 4248199 (1981-02-01), McWhorter
patent: 4312313 (1982-01-01), McWhorter
patent: 5134849 (1992-08-01), McWhorter
patent: 5154141 (1992-10-01), McWhorter
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