LUBRICATION SYSTEM FOR INTERNAL COMBUSTION ENGINE

摘要

A lubrication system for an engine is provided which includes an oil tank, a first passage communicating a bottom part of the crankcase chamber with an upper part of the oil tank, a first check valve provided in the first passage to permit a flow from the crankcase chamber to the oil tank but not in a reverse direction, a second passage communicating an upper part of the oil tank with an upper part of the crankcase chamber, a second check valve provided in the second passage to permit a flow from the oil tank to the crankcase chamber but not in a reserve direction and a third passage communicating a lower part of the oil tank with the second passage.

主权项

1. A lubrication system for an internal combustion engine, wherein a pressure in a crankcase chamber thereof pulsates owing to a reciprocating movement of a piston in a cylinder, the system comprising:
an oil tank storing lubricating oil therein; a first passage communicating a vertically lower part of the crankcase chamber with a gas phase part of the oil tank; a first check valve provided in the first passage to permit a flow from the crankcase chamber to the oil tank but not in a reverse direction; a second passage communicating the gas phase part of the oil tank with a vertically upper part of the crankcase chamber; a second check valve provided in the second passage to permit a flow from the oil tank to the crankcase chamber but not in a reserve direction; and a third passage communicating a liquid phase part of the oil tank with the second passage.