An adapter for the intake side of an oil and air separation system, including a first end portion capable of replacing an engine oil fill cap, the first end portion connected to an intermediate portion that removably engages with a second end portion including a hose coupling that allows the adapter to be connected to the intake side of an oil and air separation system via a hose.

A positive crankcase ventilation valve for an engine is provided with a valve body defining apertures fluidly coupling a crankcase and an intake manifold of the engine, with each aperture sized to prevent an entrained oil droplet from flowing therethrough. The valve has a valve element supported by the body to selectively cover at least one of the apertures in response to a pressure difference between the manifold and the crankcase to provide variable air flow from the crankcase to the intake manifold. A method includes, in response to an increasing absolute pressure difference between the manifold and the crankcase, passively moving a valve element to selectively cover apertures fluidly coupling the crankcase and the manifold to control an air flow from the crankcase to the intake manifold to a predetermined variable flow profile, and separating oil droplets from the air flow via the apertures.

The oil mist separator separates oil from blow-by gas which flows through a gas flow passage. A chamber, which is partitioned from the gas flow passage including a gas introduction port, is provided between a cylinder head cover and a baffle plate. A first guide wall, which extends with a downward inclination toward the chamber so as to cover the gas introduction port and the chamber, is provided above the gas introduction port and the chamber. A drain hole for discharging the oil within the chamber is formed in the baffle plate.

An engine device with high reliability and high safety even in use in cold regions, especially in arctic regions at 20 C. or less, the engine device including: a heating portion (21, 22, 23, 24, 25, 26) configured to increase a temperature in a mixed region where an intake air flowing in a blow-by gas mixed joint (20, 20A, 20B, 20C, 20D) and a blow-by gas introduced from a returning hose (12) are mixed; and/or a pressure regulation portion (121, 125) having a blow-by gas passage in which the blow-by gas from a combustion chamber flows.

The present invention provides an oil separator that can improve oil separation performance with a simple structure. An oil separator 10 includes a casing 15 that has an inlet 11 and an outlet 12 and the oil separator 10 is configured to separate oil contained in blow-by gas 2 in the casing 15. The casing 15 includes therein multiple staggered partition walls 25, 35 to form a gas passage 40 through which the blow-by gas 2 flows in a meandering manner in a horizontal direction from the inlet 11 to the outlet 12, and a filter element 50 that partially closes the gas passage 40 and crosses the partition walls 25.

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.

A working fluid case includes a housing and a breather device. The breather device includes a vent passage located in a recess formed in the housing.

Provided is an oil separator that operates in an efficient manner as a whole for collection of oil mist in blowby gas as multiple oil separator units collect the oil mist equally regardless of various particle sizes thereof. The oil separator includes a distribution chamber distributing blowby gas, an introducing hole introducing the blowby gas into the distribution chamber, at least one set of oil separator units disposed in symmetry relative to at least one plane having an axis extending through an axis of the introducing hole of axes of flowing directions of the blowby gas entering the distribution chamber through the introducing hole, and distribution channels causing the blowby gas to flow from the distribution chamber to the respective oil separator units.

An internal combustion engine having manifold ports and positive crankcase ventilation (PCV) passages integrated into the cam cover is disclosed. The engine system comprises a cam cover having an internal, gas-passing passage, a PCV valve associated with the passage, an oil separator associated with the PCV valve, and an intake manifold having a port, the port being associated with the PCV valve. An oil separator is fitted between the gas-passing passage and the PCV valve. The oil separator is mounted on the cam cover. A manifold chamber is also provided and the PCV oil separator is associated with the manifold chamber.