Sliding structure of internal combustion engine, control method of idling operation, operation control method of internal combustion engine

摘要

In the sliding structure of the internal combustion engine according to the present invention, the cylinder has a plurality of recessed portions formed in the central region of the stroke, and the outer peripheral surface of the piston ring has an inclined surface, and moves relative to each other through the inclined surface. The lubricating oil flows into the gap between the wall surface and the outer peripheral surface to enable fluid lubrication, and the piston ring has the maximum speed in the stroke central region at any rotation speed that is equal to or higher than the idling speed of the internal combustion engine The coefficient of friction of the place where it passes by (hereinafter referred to as the central friction coefficient) is set to be smaller than the central friction coefficient in the case where no recess is formed in the same stroke central region, while The friction coefficient (hereinafter referred to as the external friction coefficient) when the piston ring passes through any location of the outer region which is outside the stroke central region is a case where a plurality of recesses are formed in the outer region. That was to be set to be smaller than the outside coefficient of friction. As a result, further low fuel consumption can be realized with respect to the dimple liner technology.