METHOD AND DEVICE FOR INJECTING OIL TO CYLINDER OF DIESEL ENGINE

PURPOSE:To perform cost down of oil injection to a cylinder, by dividing an oil injecting area for a cylinder liner into its upper and bottom two parts and supplying high grade lubricating oil to an upper part of the liner while circulatively supplying low grade lubricating oil containing drain oil to a bottom part of the liner. CONSTITUTION:In an oil injecting device, a cylinder liner 2 is divided into upper and bottom oil injecting areas 2a, 2b. Then plural upper oil injection holes 16 opened to an internal surface of the liner and an oil injection metal fixture 17 are provided to the area 2a to form an open oil injection system whereby high grade lubricating oil of high alkaline cylinder oil or the like is supplied by an oil pump 20 from an upper oil tank 18. While bottom oil injection holes 22 and an oil injection metal fixture 23 are provided also to the area 2b to introduce low grade lubricating oil of drain oil, system oil, low alkaline cylinder oil, etc. collected by a collector 28 to an oil tank 24 through an oil purifier 34, drain pump 35 and oil filter 36 from drain tanks 31, 33, and constitute a circulative oil injection system supplying the low grade oil by an oil pump 26.