There is provided a breather device for an engine and capable of suppressing forming of separated oil into mist again. The breather device for the engine includes an oil filter chamber at a midpoint of a blow-by gas passing route and an oil filter housed in the oil filter chamber. The oil filter chamber is partitioned with a partition wall into an upstream filter chamber and a downstream filter chamber arranged in a front-back direction, the filter is formed by an upstream filter and a downstream filter, the upstream filter is housed in the upstream filter chamber and the downstream filter is housed in the downstream filter chamber, respectively, and a side gas expansion chamber is provided beside the oil filter chamber so that blow-by gas flows from the upstream filter into the downstream filter through the side gas expansion chamber.

A crankcase ventilation system is provided for an internal combustion engine that includes a crankcase. An internal combustion engine including such a system is also provided.

An oil separator includes a casing that has an inlet for air and an outlet for air, and an impingement member that is provided inside the casing. Air that contains oil is introduced through the inlet into the casing and caused to strike the impingement member so that the oil is separated from the introduced air and is recovered. The outlet opens in the horizontal direction of the casing. The oil separator further includes an L-shaped elbow member that is attached to the outlet. The elbow member protrudes in the horizontal direction from the outlet and is bent upward.

An oil mist separator includes a housing and an oil separating part which separates oil mist in blow-by gas. The oil separating part is composed of a first oil separating part and a second oil separating part. The housing is provided inside with a partition wall which defines chambers formed for the respective oil separating parts, and second nozzles which jet out blow-by gas are provided in a second partition wall which defines a second chamber in which the downstream-side second oil separating part is provided. The second nozzles can serve, for example, as passages for discharging the oil separated by the second oil separating part toward a drain pipe which is provided in a first chamber.

A crankcase ventilation system is provided for an internal combustion engine that includes a crankcase. An internal combustion engine including such a system is also provided.

A separating module for a ventilation device has a housing that surrounds a separating element designed to separate liquid particles from a gas flow. A line module and a ventilation device with such a separating module and such a line module are provided. The housing of the separating module is designed to be connected to the line module that has at least three geometrically parallel channels and the housing of the separating module has corresponding housing openings to be connected to the at least three channels. Several separating modules and several line modules can be combined to adapt the ventilation system as needed.

Apparatuses, systems and methods are disclosed for separating oil from a blow-by gas of an engine. An example includes a method that includes passing the blow-by gas to a first oil separating apparatus and a second oil separating apparatus, wherein the first oil separating apparatus and the second oil separating apparatus are physically coupled together along interfacing surfaces and in fluid communication with one another as an array, separating the blow-by gas by passing the blow-by gas through respective filters of the first oil separating apparatus and the second oil separating apparatus, removing the oil from the blow-by gas with the respective filters and recombining the blow-by gas after passing from the respective filters; passing the blow-by gas as a single flow stream from the first oil separating apparatus and the second oil separating apparatus.

An oil separator for separating oil from oil-laden gases includes a housing having a plurality of cavities with an auger disposed in each cavity. Each auger has a helical flight extending about a longitudinal central axis between inlet and outlet ends. At least one of the augers has an annular wall extending from the inlet end with an end cap, including an inlet, extending thereover to delimit an inlet chamber. A valve head is disposed in the inlet chamber, wherein a spring member biases the valve head to perfect a seal over the inlet to inhibit the flow of oil-laden gases therethrough. The valve head is moveable against the bias of the spring member to an open position in response to pressure applied against the valve head sufficient to overcome the spring member bias to promote the flow of oil-laden gases through the inlet chamber and about the auger.

An internal combustion engine includes an engine block defining a plurality of cylinders each receiving a piston. A crankcase extends from the engine block and supports a crankshaft drivingly connected to the pistons and including a chamber enclosed by a wall portion that defines a first blow-by flow passage and first and second drain passages therethrough. An oil sump mounted to the crankcase. A first oil separator is mounted to the wall of the crankcase in communication with the first blow-by flow passage and the first drain passage and defining a second blow-by flow passage therethrough and a third drain passage extending therethrough in communication with the second drain passage. A second oil separator mounted to the first oil separator in communication with the third drain passage and defining a third blow-by flow passage in communication with the second blow-by flow passage.

An oil separator is provided with a case that has an air inlet and a plurality of expansion chambers formed within the case. Air that contains oil is introduced into the case via the inlet and caused to strike a impingement plate to thereby separate the oil from the introduced air and recover the oil. The transverse cross-sectional area of each expansion chamber is greater than the open area of the inlet. Partition walls with orifice holes formed therein are provided between the expansion chambers.