US 4,287,860 AGranted

Two-cycle engine

AssigneeKawasaki Jukogyo Kabushiki Kaisha

InventorsTetsuzo Fujikawa, Toshiyuki Takada, Kichiji Misawa

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Abstract

A two-cycle engine of the crank chamber preloading type of the construction in which a crankcase, a cylinder head and a cylinder are clamped together by a plurality of clamping members penetrating the cylinder includes a suction port formed in a wall of the cylinder, an exhaust port formed on a side of the cylinder opposite the suction port, at least one main scavenging port disposed between the suction port and the exhaust port and directed toward the suction port, and at least one ancillary scavenging port disposed above the suction port and juxtaposed against the exhaust port. At least one ancillary scavenging passage branching from at least one main scavenging passage and communicating with the ancillary scavenging port extends around an opening for one of clamping members on the suction side.

Claims4

Dependent claims

A two-cycle engine of the crank chamber preloading type comprising:

a cylinder head;
a crankcase;
a cylinder interposed between said cylinder head and said crankcase;
a plurality of clamping members penetrating said cylinder to clamp together said cylinder head, said cylinder and said crankcase;
a piston arranged in said cylinder for sliding reciprocating movement;
a suction port and an exhaust port formed in the wall of said cylinder;
at least one main scavenging port formed in the wall of said cylinder and communicating with a crank chamber in said crankcase via a main scavenging passage;
and
at least on ancillary scavenging port formed in the wall of said cylinder and communicating with said crank chamber via an ancillary scavenging passage;
wherein the improvement resides in that said ancillary scavenging port extends through the wall of said cylinder in a manner to surround the outside of one of said clamping member receiving openings.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/133,373Filed 24 Mar 1980
Priority: JP 54-4081328 Mar 1979
Granted: 8 Sep 1981
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F02B 33/44
Engines characterised by provision of pumps for charging or scavenging: passages conducting the charge from the pump to the engine inlet, e.g.…
F02B 25/14
Engines characterised by using fresh charge for scavenging cylinders: using reverse-flow scavenging, e.g. with both outlet and inlet ports…
F02B 33/04
Engines with reciprocating-piston pumps; Engines with crankcase pumps: with simple crankcase pumps, i.e. with the rear face of a non-stepped…
F02F 1/22
Other cylinders: characterised by having ports in cylinder wall for scavenging or charging