Abstract: A plastic molded article includes a base having a main surface, a first tubular portion protruding from the main surface, a second tubular portion protruding from the main surface and having an inner diameter smaller than that of the first tubular portion, and a pair of ribs that protrudes from the main surface and connects an outer circumferential surface of the first tubular portion and an outer circumferential surface of the second tubular portion to each other. The base, the first tubular portion, the second tubular portion, and the ribs are integrally molded of plastic. The ribs are located on opposite sides of an imaginary plane that includes a central axis of the first tubular portion and a central axis of the second tubular portion.

Abstract: An oil mist separator includes a case. The case includes an inlet, an outlet, a gas passage, and an oil discharge portion. The case includes a first member located in an upper portion of the case, a second member located in a lower portion of the case, and a third member partitioning the first member and the second member. The first member, the second member, and the third member are welded to each other in a stacked state. The gas passage includes an upper passage defined by the first member and the third member, a lower passage defined by the second member and the third member, and a connection passage. The connection passage connects the upper passage to the lower passage at a portion in the case corresponding to an end of the case on one side.

Abstract: A PCV valve coupling structure that couples a PCV valve to an internal combustion engine is employed in the PCV valve used to adjust a gas flow area of a blow-by gas passage. Blow-by gas in the internal combustion engine flows to an intake system of the internal combustion engine. In the PCV valve coupling structure, the PCV valve is coupled to the internal combustion engine in a non-removable manner.

Abstract: An oil mist separator includes a case. The case includes an inlet, an outlet, a gas passage, and an oil discharge portion. The case includes a first member located in an upper portion of the case, a second member located in a lower portion of the case, and a third member partitioning the first member and the second member. The first member, the second member, and the third member are welded to each other in a stacked state. The gas passage includes an upper passage defined by the first member and the third member, a lower passage defined by the second member and the third member, and a connection passage. The connection passage connects the upper passage to the lower passage at a portion in the case corresponding to an end of the case on one side.

Abstract: A plastic molded article includes a base having a main surface, a first tubular portion protruding from the main surface, a second tubular portion protruding from the main surface and having an inner diameter smaller than that of the first tubular portion, and a pair of ribs that protrudes from the main surface and connects an outer circumferential surface of the first tubular portion and an outer circumferential surface of the second tubular portion to each other. The base, the first tubular portion, the second tubular portion, and the ribs are integrally molded of plastic. The ribs are located on opposite sides of an imaginary plane that includes a central axis of the first tubular portion and a central axis of the second tubular portion.

Abstract: An oil mist separator includes a case including an inflow port into which blow-by gas flows and an outflow port out of which blow-by gas flows, a separation unit arranged in the case, and an oil discharge unit arranged at a lower part of the case. The oil mist separator is configured to separate oil mist contained in blow-by gas by the separation unit and discharge oil separated by the separation unit to an outside of the case through the oil discharge unit. The oil discharge unit includes a discharge port through which oil is discharged to the outside of the case and a constriction arranged above the discharge port. The constriction is partially decreased in a small cross-sectional flow area.

Abstract: A positive crankcase ventilation system includes a positive crankcase ventilation valve, a coupling part, and a plate member. The coupling part is configured to couple the positive crankcase ventilation valve and an internal combustion engine. The plate member is attached to the coupling part on an opposite side from a side where the coupling part and the internal combustion engine contact each other. A portion of the plate member is bent in a direction toward a base of a hose insertion port provided on the positive crankcase ventilation valve, and another portion of the plate member is bent in a direction toward a side wall of an attachment portion of the positive crankcase ventilation valve provided on the coupling part.

Abstract: A case for an oil mist separator comprises an inlet and an outlet through which blow-by gas flows, a separation section for separating oil mist contained in the blow-by gas, and an oil discharge section disposed at a bottom portion of the case. The oil discharge section includes a first discharge part having a first discharge hole for discharging the separated oil, and a second discharge part surrounding the first discharge hole. The second discharge part includes a reservoir for storing the oil discharged from the first discharge hole, and a second discharge hole provided at a bottom portion of the reservoir. The second discharge part further includes a passage providing fluid communication between the inside and the outside of the second discharge part.

Abstract: 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.

Abstract: A positive crankcase ventilation system includes a positive crankcase ventilation valve, a coupling part, and a plate member. The coupling part is configured to couple the positive crankcase ventilation valve and an internal combustion engine. The plate member is attached to the coupling part on an opposite side from a side where the coupling part and the internal combustion engine contact each other. A portion of the plate member is bent in a direction toward a base of a hose insertion port provided on the positive crankcase ventilation valve, and another portion of the plate member is bent in a direction toward a side wall of an attachment portion of the positive crankcase ventilation valve provided on the coupling part.

Abstract: An oil separator includes a case that has an inflow port, an outflow port, and an oil separation portion. The case has a first wall portion and a second wall portion that constitute a flow channel, and a partition wall portion that connects the first wall portion and the second wall portion. The partition wall portion partitions the flow channel into an upstream-side flow channel and a downstream-side flow channel. The oil separation portion has a constriction hole and a step portion. The step portion has a collision face located on the axis of the constriction hole and configured such that blow-by gas that passes through the constriction hole collides against the collision face, and allows oil that collects on the step portion to be discharged into the upstream-side flow channel through the constriction hole.

Abstract: 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.

Abstract: A PCV valve coupling structure that couples a PCV valve to an internal combustion engine is employed in the PCV valve used to adjust a gas flow area of a blow-by gas passage. Blow-by gas in the internal combustion engine flows to an intake system of the internal combustion engine. In the PCV valve coupling structure, the PCV valve is coupled to the internal combustion engine in a non-removable manner.

Abstract: An oil separator includes a case that has an inflow port, an outflow port, and an oil separation portion. The case has a first wall portion and a second wall portion that constitute a flow channel, and a partition wall portion that connects the first wall portion and the second wall portion. The partition wall portion partitions the flow channel into an upstream-side flow channel and a downstream-side flow channel. The oil separation portion has a constriction hole and a step portion. The step portion has a collision face located on the axis of the constriction hole and configured such that blow-by gas that passes through the constriction hole collides against the collision face, and allows oil that collects on the step portion to be discharged into the upstream-side flow channel through the constriction hole.

Abstract: A case for an oil mist separator comprises an inlet and an outlet through which blow-by gas flows, a separation section for separating oil mist contained in the blow-by gas, and an oil discharge section disposed at a bottom portion of the case. The oil discharge section includes a first discharge part having a first discharge hole for discharging the separated oil, and a second discharge part surrounding the first discharge hole. The second discharge part includes a reservoir for storing the oil discharged from the first discharge hole, and a second discharge hole provided at a bottom portion of the reservoir. The second discharge part further includes a passage providing fluid communication between the inside and the outside of the second discharge part.

Abstract: An oil mist separator includes a case including an inflow port into which blow-by gas flows and an outflow port out of which blow-by gas flows, a separation unit arranged in the case, and an oil discharge unit arranged at a lower part of the case. The oil mist separator is configured to separate oil mist contained in blow-by gas by the separation unit and discharge oil separated by the separation unit to an outside of the case through the oil discharge unit. The oil discharge unit includes a discharge port through which oil is discharged to the outside of the case and a constriction arranged above the discharge port. The constriction is partially decreased in a small cross-sectional flow area.

Abstract: An oil separator includes a case, electrode plates, filters, and a power supply unit. The electrode plates are arranged in the case with a space in between such that any two adjacent electrode plates face each other. The filters are made of an electrically insulating material and each arranged between any two adjacent electrode plates. The power supply unit is connected to the electrode plates and applies voltage between any two adjacent electrode plates, thereby creating a potential difference between the adjacent electrode plates. The filling factor of each filter is in a range from 0.005 to 0.03. The voltage applied between any two adjacent electrode plates by the power supply unit is in a range from 0.5 to 5 kV. The distance between any two adjacent electrode plates is in a range from 3 to 20 mm.

Abstract: 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.

Abstract: 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.

Abstract: An oil mist separator includes: a housing which is provided separately from a body of an engine; and an oil separating part which separates oil in blow-by gas generated in the engine. The housing includes: an inlet case which is provided on the upstream side of the oil separating part; an outlet case which is provided on the downstream side of the oil separating part; and a first body case and a second body case which are disposed in series in a flowing direction of the blow-by gas and have the same shape. The oil separating part is composed of a first oil separating part and a second oil separating part which are disposed in series in a flowing direction of the blow-by gas.