Two-cycle engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorYoshiharu Isaka
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Abstract
A two-cycle engine system of the crankcase precompression type comprising the combination of a first engine, a second engine and a combustion chamber provided with an ignition plug constructed in such a manner that the second engine is mounted in parallel and adjacent to the first engine with the combustion chamber interconnecting the first and second engines, whereby the construction becomes very compact. A rich air-fuel mixture is supplied into the combustion chamber through the second engine for ignition and a lean mixture (or air) is supplied into the first engine for scavenging and combustion so that the system provides a very compact design as well as a satisfactory performance in the reduction of the amount of harmful components in the exhaust gases.
Claims18
A crankcase precompression type two-cycle engine system comprising:
- a crankcase precompression type first two-cycle engine including a first cylinder having, in the wall thereof, an exhaust port and at least one scavenging port, a first piston reciprocating in said cylinder to open and close said exhaust and scavenging ports, a first crankcase connected with said scavenging port through at least one scavenging passage and an intake passage to supply air or lean air-fuel mixture to said first crankcase;
- a crankcase precompression type second two-cycle engine, including a second cylinder mounted substantially in parallel with the first cylinder and having, in the wall thereof, at least one second scavenging port, a second piston reciprocating in said second cylinder to open and close said scavenging port therein, a second crankcase connected with said scavenging port in said second engine through at least one second scavenging passage, and a second intake passage to supply a rich air-fuel mixture to said second crankcase, said second piston being cooperatively coupled to said first piston so that said pistons move approximately at the same timing;
- and
- a combustion chamber provided with an ignition plug and positioned between the first and second engines, interconnecting the cylinders of said engines.
Dependencies are inferred from the claim text.