Internal-combustion engines – Starting device – Compression relieving type
Patent
1995-07-12
1997-08-05
Dolinar, Andrew M.
Internal-combustion engines
Starting device
Compression relieving type
F01L 1308
Patent
active
056531990
ABSTRACT:
In an automatic decompression device for an engine, having a decompression cam supported on a camshaft adjacent to a valve operating cam for movement between a biased valve opening position in which the decompression cam causes a cam surface to project beyond a base circle portion of the valve operating cam to bias open an exhaust valve or an intake valve in a compression stroke of the engine, and a retracted position in which the decompression cam retracts the cam surface inwardly of the base circle portion of the valve operating cam under centrifugal forces acting on the counterweight against spring forces of a spring when the engine operates at a relatively high rotational speed, to prevent oil from being trapped between the decompression cam and the camshaft and allow the decompression cam to operate smoothly to decompress the engine when the engine starts at low temperatures. A decompression cam includes a plurality of recesses defined at circumferentially spaced intervals on the inner circumferential surface of the decompression cam, the recesses define therebetween lands for limiting the range of movement of the decompression cam in a plane perpendicular to the axis of a camshaft.
REFERENCES:
patent: 4790271 (1988-12-01), Onda
Ishiuchi Yukio
Kakinuma Hiroyuki
Ono Yuji
Dolinar Andrew M.
Honda Giken Kogyo Kabushiki Kaisha
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