Ishikawajima-shibaura Machinery Co., Ltd.

Ishiakawjima-shibaura Machinery Co., Ltd.

Toshio Hirabayashi

Shigemitsu Aizawa

Naohiro Maruyama

Masatomi Nijoh

An oil supply passage is provided for connecting an oil chamber with a valve chamber, an oil feed passage for connecting a valve chamber with a crank chamber, and an oil return passage for connecting the crank chamber with the oil chamber. The oil return passage is connected with the crank chamber via a plurality of return vents formed on an inner surface of the crank chamber at approximately equal intervals. Providing a bypass passage, one end of the bypass passage opens adjacent to a ceiling of the valve chamber. Another end of the bypass passage opens into a portion facing the restrictor formed adjacent to an outlet of the oil feed passage. Accordingly, the crank chamber and the valve chamber are lubricated by pressure fluctuations of the crank chamber according to the reciprocation of a piston. Thus, it is possible to lubricate the engine even when the engine is tilted in any direction.

Oil supply apparatus of a four-stroke-cycle engine

Disclosed is a lubricating system for lubricating moving parts in a crank case of a four-stroke-cycle engine. The lubricating system comprises an oil tank for holding oil, an oil passage connected to the oil tank and an engine crank chamber, an oil supply means for supplying fine particles of oil held in the oil tank to the moving parts in the crank chamber via the oil passage, and an oil removing means for removing the fine particles of oil applied to the moving parts in the crank chamber, from the crank chamber without forming oil accumulation. To supply the fine particles of oil to the moving parts in the crank chamber, the oil of a liquid form is thrown to impinge against the moving parts in the crank chamber or is mixed with a gas entering the crank chamber. To remove the oil from the crank chamber without forming oil accumulation, the oil supplied to the moving parts is led up into the combustion chamber through the piston, or is returned into the oil tank with a pressure produced by reciprocation of the piston. The oil led into the crank chamber is in a form of fine particles, and therefore can easily be removed from the crank chamber without forming any oil accumulation.

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Higashichikuma, Japan

Toshio Hirabayashi