Decompression device in a two-cycle engine

Details Decompression device in a two-cycle engine Decompression device in a two-cycle engine

1989-05-15

1991-10-08

Dolinar, Andrew M.

Internal-combustion engines

Starting device

Compression relieving type

123 65P, F02N 1700

Patent

active

050544411

ABSTRACT:
For the purpose of preventing a decompression passageway in a two-cycle engine from being blocked by carbon soot, facilitating manufacture of a two-cycle engine having decompression structure and eliminating reduction of output power of the two-cycle engine caused by the decompression structure, a known two-cycle engine includes a scavenging passageway formed along an inner wall of a cylinder. The scavenging passageway is directed in the axial direction of the cylinder and communicates with a crank case of the engine. A decompression groove extends in the axial direction of the cylinder on the upstream side of a cylinder cooling airflow at a top end portion of the scavenging passageway. The width and depth of the decompression groove are either varied along the axial direction of the groove so as to be narrowed towards a tip end thereof directed toward a plug, or are provided with a narrowed portion of venturi shape.

REFERENCES:
patent: 2985157 (1961-05-01), Venediger
patent: 3417740 (1968-12-01), Perlewitz
patent: 3774303 (1973-11-01), Burkett et al.
patent: 4312308 (1982-01-01), Slattery

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