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US 5,490,482 AGranted
Two cycle engine with piston mounted poppet valve operating mechanism
OwnerWilliam Genetinventor
Life of this patent
Estimating the term…
Abstract
A two cycle piston engine is described in which one or more intake poppet valves are carried in the top of the piston which driven onto a respective mating valve seat in the cylinder head by piston movement towards top dead center, a spring allowing retraction of the valve into the piston top after the poppet valve seats on its valve seat. A two valve arrangement opens one valve before the other, with air only in flowing through the first valve seat prior to opening of the other valve seat, through which fuel is injected.
Claims9
A two cycle internal combustion piston engine comprising:
- a cylinder block defining a cylinder bore;
- a cylinder head closing off said cylinder bore;
- a piston slidable in said cylinder bore having a top portion defining, together with said cylinder bore and said cylinder head, a combustion chamber;
- a crankshaft and means rotating said crankshaft by reciprocation of said piston in said cylinder bore;
- an exhaust port in said cylinder bore opened by movement of said piston towards bottom dead center;
- an intake port in said cylinder head allowing inflow of air into said combustion chamber;
- fuel injection means directing a fuel charge into said combustion chamber during each engine intake cycle;
- and
- a poppet valve including a valve head and a valve stem, said valve stem slidably mounted in said piston top and spring means carried by said piston urging said poppet valve outward so that said valve head projects outwardly from said piston top and into said combustion chamber;
- a valve seat associated with said air intake port and aligned with said poppet valve head so that said poppet valve head is driven to seat onto said valve seat as said piston moves towards top dead center;
- said spring means overcome by continued movement of said piston towards top dead center to slide said poppet valve stem back into said piston.
8 more elements
Dependencies are inferred from the claim text.