JP2012122370A - Oil mist separator of blow-by gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently reduce oil consumption, and to simplify device configuration, in an oil mist separator of blow-by gas.SOLUTION: This oil mist separator includes a passage part 25 for separating oil mist included in the blow-by gas flowing to a blow-by gas outlet 21 from a blow-by gas inlet 20. The passage part 25 is constituted so that the blow-by gas flows from the upstream to the downstream while changing the advancing direction, and includes a through-hole 27 for opening an oil flow passage for allowing oil pooled in a cell 12 to flow to the blow-by gas inlet 20 along a lower wall 13 by being separated from the blow-by gas.

Description

  The present invention relates to an apparatus for separating oil mist contained in blow-by gas of an internal combustion engine.

  In an internal combustion engine, a technique is well known in which the blow-by gas in the crank chamber (combustion gas blown through the gap between the cylinder and the piston during operation) is released to the atmosphere or returned to the intake system and re-burned.

  In such a prior art, in order to prevent an increase in oil consumption, a device for separating oil mist in the blow-by gas is provided in a blow-by gas path (a passage for opening to the atmosphere or returning to the intake system) ( Patent Document 1, Patent Document 2).

  FIG. 5 shows an example of a conventional oil mist separator. In the figure, an oil mist separating device 50 is built in a head cover of an internal combustion engine (a part that covers the upper surface of the valve cover where the rocker chamber is opened and constitutes a cylinder head together with the valve cover).

  A housing 51 forms a compartment 52 in the head cover. The compartment 52 is defined by a lower wall, an upper wall 58, and side walls 54 to 57 surrounding these. A blow-by gas inlet 60 (inlet) is provided on one side of the compartment 52, and a blow-by gas outlet 61 (outlet) is provided on the other side separated from the inlet 60. The inlet 60 is opened in the lower wall 53 of the compartment 52 and is connected to the crank chamber of the internal combustion engine. The outlet 61 is opened in the side wall 55 of the compartment 52 and is connected to the intake system of the internal combustion engine. In the drawings (a) and (b), a form in which the upper wall 58 of the housing 51 is cut out and the upper surface is opened is shown.

  A labyrinth 65 (maze) is formed between the inlet 60 and the outlet 61. The labyrinth 65 is partitioned into a plurality of parallel flow paths, and these flow paths communicate with each other in a ninety-nine fold shape. Reference numeral 66 denotes a partition for partitioning the flow paths, and the one protruding from the lower wall 53 to the upper wall 58 and the one protruding from the upper wall 58 to the lower wall 53 are alternately arranged.

  In order to discharge the oil accumulated in the compartment 52, the section S1 on the lower wall 53 partitioned between the partitions 66 protruding from the lower wall 53 to the upper wall 58, and the partitions 66 protruding from the side wall 55 and the lower wall 53 to the upper wall 58. An oil discharge hole 68 (drain hole) is provided in each of the sections S2 on the lower wall 53 partitioned between the two. Each discharge hole 68 opens a section on the lower wall 53 to the lower rocker chamber.

  The blow-by gas introduced from the crank chamber into the most upstream flow path through the inlet 60 flows while changing the direction in which the labyrinth 65 having a ninety-fold shape moves straight as indicated by a dotted arrow. In the process, the oil mist is separated from the blow-by gas by inertia and adheres to the wall surface of the compartment 52. The oil adhering to the wall surface flows down to the lower wall 53 and is discharged from the discharge hole 68 to the lower rocker chamber. The oil adhering to the wall surface of the most upstream flow channel flows down the wall surface and is returned from the blow-by gas inlet 60 to the crank chamber.

JP 2008-115800 A JP 2009-203977 A

  In such a conventional example, depending on the operation state of the internal combustion engine, oil mist may be sucked from the oil discharge hole 68 together with the air in the rocker chamber and taken out from the blow-by gas outlet 61 to the intake system. In other words, it is conceivable that the oil discharge hole 68 becomes a new source of oil mist and impairs the effect of reducing oil consumption.

  An object of this invention is to provide the means for eliminating such a malfunction.

  The present invention includes a compartment formed by an upper wall, a lower wall, and a side wall surrounding these, a blow-by gas inlet that is opened on one side of the compartment, and an opening on the other side of the compartment. A blow-by gas outlet, and a passage portion for separating oil mist contained in the blow-by gas flowing through the compartment from the blow-by gas inlet to the blow-by gas outlet, wherein the blow-by inlet is a lower wall of the compartment The passage portion is configured to flow while changing the direction in which the blow-by gas advances straight from upstream to downstream, and in order to discharge the oil accumulated on the lower wall of the compartment by the oil mist separated from the blow-by gas, Blowby gas oil characterized by comprising a through hole that opens an oil passage that allows oil to flow on the lower wall to the blowby gas inlet. It is a strike separation device.

  In the present invention, since the blow-by gas inlet can also be used as an oil discharge hole, there is no need to provide a dedicated oil discharge hole as in the prior art, and the configuration of the apparatus can be simplified. In addition, since there is no conventional oil discharge hole that can be a source of oil mist, reduction of oil consumption is promoted.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic structure of 1st Embodiment is demonstrated, (a) is a schematic diagram, (b) is a perspective view, (c) is a longitudinal cross-sectional view seen from A arrow direction (side). The schematic structure of 2nd Embodiment is demonstrated, (a) is a schematic diagram, (b) is a perspective view, (c) is a top view seen from A arrow direction (above). The schematic structure of 3rd Embodiment is demonstrated, (a) is a schematic diagram, (b) is a perspective view, (c) is a longitudinal cross-sectional view seen from a side. The schematic structure of 4th Embodiment is demonstrated, (a) is a schematic diagram, (b) is a perspective view, (c) is a longitudinal cross-sectional view seen from A arrow direction (side). BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates a schematic configuration of a related art, in which (a) is a schematic diagram, (b) is a perspective view, and (c) is a longitudinal sectional view as seen from the direction indicated by the arrow A (side).

  FIG. 1 shows a schematic configuration of a blow-by gas oil mist separation device according to the first embodiment, and an application example to a labyrinth type (maze type) oil mist separation device will be described based on the drawings.

  In FIG. 1, an oil mist separating device 10 is built in a head cover of an internal combustion engine (a part that covers the upper surface of the valve cover where the rocker chamber is opened and constitutes a cylinder head together with the valve cover).

  A housing 11 forms a compartment 12 in the head cover. The compartment 12 is defined by a lower wall 13, an upper wall 18, and side walls 14 to 17 surrounding them. A blow-by gas inlet 20 (inlet) is provided on one side of the compartment 12, and a blow-by gas outlet 21 (outlet) is provided on the other side separated from the inlet 20. The inlet 20 is opened in the lower wall 13 of the compartment 12 and is connected to the crank chamber of the internal combustion engine. The outlet 21 is opened in the side wall 15 of the compartment 12 and connected to the intake system of the internal combustion engine. In (a) and (b) of the figure, a form in which the upper wall 18 of the housing 11 is cut out and the upper surface is opened is shown.

  A labyrinth 25 is provided as a passage portion for separating oil mist contained in blow-by gas flowing from the blow-by gas inlet 20 to the blow-by gas outlet 21. The labyrinth 25 is partitioned into a plurality of parallel flow paths, and these flow paths communicate with each other in a ninety-nine fold shape.

  Reference numeral 26 denotes a partition for partitioning the flow paths, and the one protruding from the lower wall 13 to the upper wall 18 and the one protruding from the upper wall 18 to the lower wall 13 are alternately arranged. The labyrinth 25 is configured in a vertical shape in which a flow path for causing the blow-by gas to move straight up and down in the vertical direction communicates in a ninety-nine fold shape.

  A through hole 27 is provided in the labyrinth 25 in order to discharge the oil accumulated in the compartment 12. The through hole 27 is formed by notching a partition 26 protruding from the lower wall 13, and the oil that accumulates in the section (see S 1 and S 2 in FIG. 5) partitioned on the lower wall 13 by the partition 26 is the most upstream. It is set to open as an oil flow path (see solid line arrow) that allows flow to the blow-by gas inlet 20.

  The blow-by gas introduced from the crank chamber into the uppermost flow path through the inlet 20 flows through the ninety-nine-folded labyrinth 25 while changing the straight direction as indicated by a dotted arrow. In the process, the oil mist is separated from the blow-by gas by inertia and adheres to the wall surface of the compartment 12.

  The oil adhering to the wall surface of the uppermost flow path flows down the wall surface and is returned from the blow-by gas inlet 20 to the crank chamber. The oil adhering to the wall surface of the downstream channel from the most upstream channel flows down the wall surface and accumulates on the lower wall 13, but between the through hole 27 and the partition 26 and the lower wall 13 (the ninety nines of the labyrinth). It flows through the folded communication portion) and is returned from the blow-by gas inlet 20 to the crank chamber.

  With such a configuration, the blow-by gas inlet 20 can also be used as an oil discharge hole, so that it is not necessary to provide a dedicated oil discharge hole as in the prior art, and the configuration of the apparatus can be simplified. In addition, the conventional oil discharge hole (see FIG. 5) may serve as a source of oil mist, but it is not necessary, so that reduction of oil consumption is promoted.

  FIG. 2 shows a schematic configuration of a blow-by gas oil mist separation device according to the second embodiment, and an application example to a labyrinth type (maze type) oil mist separation device will be described based on the drawings. In the drawings (a) to (c), a form in which the upper wall of the housing 11 is cut out and the upper surface is opened is shown.

  The labyrinth 25 is configured in a horizontal shape in which a plurality of partitions 26 guide a flow path that guides the blow-by gas to the left and right in the horizontal direction and communicates in a ninety-nine fold shape. In the labyrinth 25, the flow path communicates in a ninety-nine fold shape on the lower wall 13, so that the oil accumulated in the compartment 12 flows on the lower wall 13 along the labyrinth 25 to the blow-by gas inlet 20. A through hole 27a is provided in order to improve the oil dischargeability. The through hole 27a is formed to open as an oil flow path that short-circuits the labyrinth 25 linearly.

  The blow-by gas introduced from the crank chamber into the uppermost flow path through the inlet flows while changing the straight direction of the ninety-nine-folded labyrinth 25. In the process, the oil mist is separated from the blow-by gas by inertia and adheres to the wall surface of the compartment 12.

  The oil adhering to the wall surface of the uppermost flow path flows down the wall surface and is returned from the blow-by gas inlet 20 to the crank chamber. The oil adhering to the wall surface of the flow path downstream from the most upstream flow path flows down the wall surface and accumulates on the lower wall 13, and between the through hole 27 a and the partition 26 and the side wall 17 (the ninety-nine fold of the labyrinth 25 The labyrinth 25 is short-circuited through the communication portion) and returned to the crank chamber from the inlet 20.

  FIG. 3 shows a schematic configuration of a blow-by gas oil mist separation device according to the third embodiment, and an application example to a labyrinth type (maze type) oil mist separation device will be described based on the drawings. In the drawings (a) and (c), a form in which the upper wall of the housing 11 is cut out and the upper surface is opened is shown.

  The labyrinth 25 is configured in a vertical shape as in the first embodiment (FIG. 1). In this case, the groove 30 is provided on the lower wall 13 from the viewpoint of further improving the oil discharging performance. The groove 30 includes a trunk groove 30A that short-circuits the 99-fold labyrinth linearly, and branch grooves 30B and 30C that are formed so as to extend along the partition 26 and join the trunk groove 30A. .

  A portion of the groove 30A crossing the partition 26 becomes a through hole (see 27 in FIG. 1 and 27a in FIG. 2). The branch groove 30 </ b> B is opened so as to face the lower end of the partition 26, and is formed so as to receive oil flowing down from the lower end of the partition 26. One side of the branch groove 30 </ b> C is opened along the wall surface on the upstream side of the partition 26, so that oil flows smoothly from the wall surface into the groove.

  With such a configuration, the oil adhering to the wall surface of the compartment 12 is collected in the trunk groove 30A by the branch grooves 30B and 30C, and is guided from the trunk groove 30A to the blow-by gas inlet 20. Accordingly, the oil can be efficiently returned to the crank chamber.

  FIG. 4 shows a schematic configuration of a blow-by gas oil mist separation device according to a fourth embodiment, and an application example to an impactor type (inertial collision type) oil mist separation device will be described based on the drawings. . In the drawings (a) and (b), a form in which the upper wall of the housing 11 is cut out and the upper surface is opened is shown.

  In the figure, reference numeral 35 denotes a partition wall that partitions the compartment 12 into an upstream side and a downstream side, and a hole 36 for restricting the flow path is opened. A partition 26 is provided on the downstream side of the partition wall 35, and the wall surface of the partition 26 faces the hole 36 of the partition wall 35. The partition 26 protrudes from the upper wall to the lower wall 13, and forms a flow path around which the flow of blow-by gas can flow between the lower end and the lower wall 13. That is, the partition 26 not only lengthens the flow path of the blow-by gas, but also constitutes a collision surface for blow-by gas that blows out from the hole 36 of the partition wall 35.

  The blow-by gas introduced into the uppermost flow path through the inlet 20 (opened in the lower wall 13 upstream of the partition wall 35) from the crank chamber flows as indicated by a dotted arrow and is throttled by the hole 36 in the partition wall 35 to reduce the flow velocity. It collides with the wall surface of the partition 26 by raising it. Thereafter, the gas flows along the partition 26, wraps around the lower end of the partition 26, enters the most downstream flow path, and is sucked out from the blow-by gas outlet 21 to the intake system.

  Oil mist in the blow-by gas is sprayed on the wall surface of the partition 26 and adheres to the wall surface of the partition 26. Further, in the process in which the blow-by gas flows to the blow-by gas outlet 21 while changing the direction in which the blow-by gas advances straight as indicated by a dotted arrow, the oil mist in the blow-by gas is separated from the blow-by gas by inertia and adheres to the wall surface of the compartment 12.

  A through hole 27b is opened in the partition wall 35 to discharge the oil. The oil accumulated on the upstream side of the partition wall 35 passes through the through hole 27b as indicated by the solid line arrow, and is returned from the blow-by gas inlet 20 to the crank chamber.

  With such a configuration, the blow-by gas inlet 20 can also be used as an oil discharge hole in the fourth embodiment, so that it is not necessary to provide a dedicated oil discharge hole as in the prior art, and the configuration of the apparatus is simplified. It becomes possible. In addition, the conventional oil discharge hole (see FIG. 5) may serve as a source of oil mist, but it is not necessary, so that reduction of oil consumption is promoted. 2 to 4, parts and parts having the same functions as those in FIG.

  In the first to fourth embodiments, the blow-by gas outlet 21 is connected to the intake system of the internal combustion engine, but may be configured to be open to the atmosphere. Further, the present invention is not limited to the labyrinth type or impactor-side oil mist separation device, but may be applied to another type of oil mist separation device.

12 compartment 13 lower wall 14-17 side wall 18 upper wall 20 blow-by gas inlet 21 blow-by gas outlet 25 labyrinth 26 partition 27 27a 27b through hole 30 groove 35 partition wall 36 blowing hole

Claims (7)

  A compartment formed from an upper wall and a lower wall and side walls surrounding these, a blow-by gas inlet opened to one side of the compartment, and a blow-by gas outlet opened to the other side of the compartment; And a passage portion for separating oil mist contained in blow-by gas flowing from the blow-by gas inlet to the blow-by gas outlet through the compartment, wherein the blow-by gas inlet is opened at a lower wall of the compartment. The passage portion is configured to flow while changing the direction in which the blow-by gas travels straight from upstream to downstream, and the oil flows down to discharge the oil accumulated on the lower wall of the compartment by the oil mist separated from the blow-by gas. An oil mist component of blow-by gas, comprising a through hole for opening an oil passage allowing passage to the blow-by gas inlet on the wall. Apparatus.   The oil mist separating apparatus according to claim 1, wherein the passage portion includes a partition that forms a labyrinth.   The oil mist separator according to claim 2, wherein the through hole is formed by cutting out a partition.   The oil mist separator according to claim 1 or 2, wherein the oil passage is formed by a groove on a lower wall.   5. The groove includes a trunk groove extending on the lower wall toward the blow-by gas inlet, and a branch groove extending on the lower wall along the partition and joining the trunk groove. The oil mist separator described in 1.   2. The oil mist separation device according to claim 1, wherein the passage portion includes a partition wall that partitions the compartment, and a hole that opens to the partition wall and blows blow-by gas onto a downstream wall surface.   The oil mist separation device according to claim 6, wherein the passage portion includes the through hole in the partition wall.

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