Internal-combustion engines – Starting device – Compression relieving type
Patent
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
Nakahara Takafumi
Nakatani Yoshihide
Okada Shigeichi
Takata Makoto
Yaezawa Eiji
Dolinar Andrew M.
Mitsubishi Jukogyo Kabushiki Kaisha
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