Reducing device of blow-bye gas

TLDR: In this paper, an opening end is arranged toward the reverse direction to an intake flow in a reducing route 9 of blow-bye gas, so that the resultant pressure (dynamic pressure+static pressure) is controlled to an almost fixed level in no relation to engine speed.

Abstract: PURPOSE:To hold pressure or the like in an engine space part to a fixed level without causing the necessity for using a particular control valve, by arranging an opening end, which appears in an intake manifold of a reducing route of blow-bye gas, in the reverse direction to an intake air flow. CONSTITUTION:At high speed operation of an engine 1, negative pressure in an intake manifold 8, that is, static pressure increases to a minus direction, on the contrary, dynamic pressure generated by a flow of blow-bye gas increases to a plus direction. Accordingly, resultant pressure (dynamic pressure+static pressure) in an opening end 9a arranged toward the reverse direction to an intake flow in a reducing route 9 of blow-bye gas is controlled to an almost fixed level in no relation to an engine speed. In this way, pressure and flow of blow-bye gas in an engine space part 5 in a pipe P, crank case and cylinder head cover constituting the route 9 can be always held to a fixed level.