Ventilator for internal combustion engine

Claim 1

A ventilator for an internal combustion engine, comprising: a housing; a diaphragm that divides the inside of the housing into a pressure chamber communicating with a crankcase and an atmospheric chamber communicating with the atmosphere; an outlet tube extending vertically in the pressure chamber and communicating with an intake manifold; a valve fixed to the diaphragm and acting to open or close an opening at an upper end of the outlet tube for controlling the quantity of blowby gas introduced into the outlet tube from the pressure chamber; an oil sump located at a lower end of the outlet tube and having a given capacity; a check valve mounted at the bottom of the oil sump to allow fluid to flow from the sump toward the pressure chamber; and an outlet port formed through the side wall of the outlet tube and protruding radially outwardly, the outlet tube being in communication with the intake manifold via the outlet port.