A cylinder head cover integrated with an active oil mist separator may include a cylinder head cover body, a booster, and an oil mist separator. The cylinder head cover body may be provided with an exhaust passage and a separation passage. The booster may be mounted outside the cylinder head cover body. The booster may have a booster intake port and a booster exhaust port. The booster intake port may be connected with the exhaust passage. The booster exhaust port may be connected with the separation passage. The oil mist separator may be mounted in the separation passage and the oil mist separator may be located on a downstream side of the booster.

An apparatus and a method are provided for a crankcase breather vent assembly to direct blow-by gases out of an engine crankcase. A vent base comprising a generally cylindrical vessel communicates received blow-by gases into an interior cavity of a breather vent that comprises a filter medium. Baffles disposed within an interior cavity of the vent base capture oil carried along with the blow-by gases. The captured oil is directed to an oil sump of the engine by way of a suitable hose. A bonnet fastenably receives the breather vent and is configured to reduce a buildup of oil residue on nearby engine components. An outer profile of the breather vent is tapered along a longitudinal dimension of the filter medium to facilitate unrestricted air flow through the filter medium when the bonnet is installed onto the breather vent.

The blow-by gas treating device 100 has a main structure portion 101 which separates oil OL from the blow-by gas BG and an outlet portion 40 which supplies gas G having been separated from the blow-by gas BG to an intake system. The main structure portion 101 has a first blow-by gas taking-in portion 111, a second blow-by gas taking-in portion 112, a separating portion 330 which separates the blow-by gas BG into oil OL and gas G, a first oil guiding portion 151 which guides the oil OL to a front side, a second oil guiding portion 152 which guides the oil OL to a rear side, a first oil drain 161 which discharges the oil OL into the engine, and a second oil drain 162 which discharges the oil OL into the engine.

An engine includes: an exhaust manifold 7 close to one of left and right side surfaces of an engine; a turbocharger 60 having an exhaust-side inlet connected to the exhaust manifold 7; and a rocker-arm-chamber-integrated intake manifold 8 being disposed on an upper surface of a cylinder head 5 and integrally including a rocker arm chamber 90 and an intake manifold 6. The intake manifold 8 has a wall 101 dividing the rocker arm chamber 90 close to the one of the left and right side surfaces of the engine 1 and the intake manifold 6 close to the other of the left and right side surfaces to isolate the rocker arm chamber 90 and the intake manifold 6 from each other. The rocker arm chamber 90 has, in its upper portion, a positive crankcase ventilation device 69 protruding therefrom and being configured to return blowby gas to an intake system. The positive crankcase ventilation device 69 has, in its side surface, a blowby-gas discharge port 67 connected with a gas conduit 68 through which blowby gas is delivered to an intake-side inlet of the turbocharger 60.

An oil separator is provided, which can accurately control an interval between an introduction hole of a gaseous body and a separation member, and can ensure a stable and high separation performance. An oil separator 30 includes a wall portion 31 having a plurality of orifices 32, and a holding portion 34 holding a separation member 33. A facing surface 33A of the separation member 33 is disposed along a front face portion 42A of a positioning portion 42 having a plurality of opening portions 42D, so that an interval L between the orifices 32 and the facing surface 33A of the separation member 33 accurately has a desired distance. A gas separated from an oil smoothly flows downward along a flow path formed by the opening portions 42D so as to reduce a pressure loss.

A crankcase ventilation system is disclosed that includes a PCV valve, a spigot and a tube connector. The PCV valve is enclosed in a module housing that encloses a plunger, and a spring. The module housing defines an inlet opening, and an outlet opening and is assembled inside an engine component. The spigot is attached to an outer surface of the engine and is in fluid communication with the PCV valve through the outlet opening. The tube connector is in fluid communication with the tube connector and the PCV valve. An intake manifold of the engine provides vacuum to the PCV valve, through the tube, the tube connector and the spigot. If one of the tube, tube connector, or spigot is detached from the engine, the PCV valve is retained in the engine and is held closed by the spring biasing the plunger against the inlet opening.

This blow-by gas discharging device is provided with: a blow-by gas pipe 23 that extends from the upper end height position to the lower end height position of an internal combustion engine 1 and that has an outlet 33 exposed to outside air and opened to the atmosphere; a heating chamber 24 that is provided to the midway of the blow-by gas pipe, and formed in a flywheel housing 10 of the internal combustion engine so as to heat a blow-by gas; and a drain mechanism that is provided to the heating chamber so as to discharge oil accumulated in the heating chamber.

This blow-by gas discharge device is provided with: blow-by gas piping 23 which is extended from the height position of the upper end of an internal combustion engine 1 to the height position of the lower end, is exposed to the outside air, and has an outlet 33 open to the atmosphere; and a heating chamber 24 which is provided between the ends of the blow-by gas piping, is formed in the flywheel housing 10 of the internal combustion engine, and heats blow-by gas.

A breather is provided for an internal combustion engine that is configured to be mounted to provide a compact, space efficient packaging arrangement for the internal combustion engine. The breather includes a housing with a front wall, a rear wall opposite the front wall, and a plurality of sidewalls connecting the front and rear walls. The front wall is configured for attachment to the rearward end of the valve cover.

The internal combustion engine includes a second separator, a connection pipe, and a pressure sensor. Inside the second separator, a main chamber located in the cylinder head cover, and a first sub-chamber and a second sub-chamber located in a joint portion located outside the cylinder head cover are formed. The first sub-chamber and the second sub-chamber are partitioned by partition walls. A communication hole connecting the first sub-chamber and the second sub-chamber is formed in the partition wall. The first sub-chamber is connected to the main chamber via a throttle portion. A first connection port connected to the first sub-chamber and a second connection port connected to the second sub-chamber are formed in the joint portion. The first connection port is connected to the intake passage via a connection pipe. The second connection port is connected to the pressure sensor.