A PCED can include an outer can, an upper lid having an upper lid intake and an upper lid exhaust, a lower lid having a lower lid exhaust, and an internal frame disposed within the can. With the internal frame disposed within the can, first, second, third, and fourth chambers can be formed, with the first chamber containing a coalescing material. Gases from a combustion engine crankcase can enter the PCED via the upper lid intake, move through the chambers, and exit the PCED via the upper lid exhaust and return to the crankcase. While moving through the chambers, impurities within the gas convert to liquid form via condensation, collect in the second chamber, and can be subsequently drained from the PCED via the lower lid exhaust.

A breather device and a snow removal machine having the breather device have a casing into which blowby gas of an engine flows, an air suction port for letting out gas from the inside of the casing, and a gas-liquid separation mechanism for separating moisture contained in the blowby gas. The gas-liquid separation mechanism separates an inlet, which allows the blowby gas to flow in, and the air suction port by a predetermined distance, and has the air suction port positioned above a liquid path through which the moisture flows. A gas path allows the blowby gas to flow from the inlet to the air suction port without passing through an air cleaner element.

A fluid conduit allowing a fluid to flow therethrough is provided, which can increase airtightness by a partition wall without reducing the accuracy of a size or a shape of an orifice provided in the partition wall. A partition wall 10 of a fluid conduit 1 is formed by joining an upper-side partition wall portion 11 and a lower-side partition wall portion 12 by welding. The lower-side partition wall portion 12 includes a joint-side portion 13 and an orifice-side portion (a wall portion 31), and while providing a joint portion 19 to the upper-side partition wall portion 11 in the joint-side portion 13, the orifice 32 is provided in the orifice-side portion, so that the joint portion 19 and the orifice 32 are disposed in a position shifted from each other when viewed from a joint direction.

An oil and gas separation device for an internal combustion engine includes a first chamber, a second chamber, and a third chamber provided successively from bottom to top, wherein the first chamber is connected to the second chamber through a first gas channel. The second chamber is connected to the third chamber through a second gas channel. The third chamber is connected to a gas outlet pipe. A bottom of the first chamber is connected to an internal combustion engine body. A lower oil baffle plate is provided between the bottom of the first chamber and the internal combustion engine body. The first gas channel is longitudinally covered by the lower oil baffle plate. The oil and gas separation effect and speed can be improved by employing the oil and gas separation device for the internal combustion engine of the present disclosure.

An internal combustion engine includes a blow-by gas treating device. The blow-by gas treating device includes a separator having a line connection portion. The line connection portion includes an intake connection union, to which an intake connection line is attached, a sensor connection union, to which a pressure sensor is connected, a partition plate, which divides the space in the separator into a first space and a second space, and a constriction, which is provided in the partition plate and allows the first space and the second space to communicate with each other. The line connection portion is constituted by combining a first unit, which includes the partition plate and defines the first space, and a second unit, which defines the second space with the partition plate of the first unit. The intake connection union and the sensor connection union are provided in the second unit.

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

A PCED can include an outer can, an upper lid having an upper lid intake and an upper lid exhaust, a lower lid having a lower lid exhaust, and an internal frame disposed within the can. With the internal frame disposed within the can, first, second, third, and fourth chambers can be formed, with the first chamber containing a coalescing material. Gases from a combustion engine crankcase can enter the PCED via the upper lid intake, move through the chambers, and exit the PCED via the upper lid exhaust and return to the crankcase. While moving through the chambers, impurities within the gas convert to liquid form via condensation, collect in the second chamber, and can be subsequently drained from the PCED via the lower lid exhaust.

An explosion relief valve for a crankcase of an engine includes a carrier plate, a cap, and an annular flame arrestor. The carrier plate includes a valve plate that has a sinuous shape for redirecting flame back into the engine. The flame arrestor includes a plurality of layers of smooth metal sheets, with each layer having a pattern of apertures that is different in size and spacing than the pattern of apertures of its adjacent layer. The apertures of each layer are partially, and only partially, aligned with the perforations of its adjacent layers. The layers are laid flush against each other to minimize or eliminate air space between the layers, leaving only the air channels existing between the apertures of the metal sheet layers as passageways for exhaust gases to be released from the valve.

Methods and systems are provided for a ducted plenum of a positive crankcase ventilation system for an engine. In one example, the ducted plenum may include a plurality of ducts coupled to a central chamber and an oil separator and valve arranged downstream of the central chamber. The ducted plenum may vent gases from an engine crankcase and deliver the vented gases to the engine intake system.

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.