JP2015068179A - Oil separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance separation performance for oil mist.SOLUTION: An oil separator 1 separating oil from gas containing oil mist, includes a first channel 11 into which the gas flows, and a second channel 12 communicating with a downstream side of the first channel 11. The second channel 12 extends in a direction crossing with respect to the downstream side of the first channel 11. The length of the first channel 11 is set longer than the inner diameter of the first channel 11.

Description

  The present invention relates to an oil separator provided, for example, in a cylinder head cover of an internal combustion engine.

  Conventionally, an oil separator for separating oil mist contained in blow-by gas of an internal combustion engine is known (see, for example, Patent Documents 1 to 3). The oil separator of Patent Document 1 is provided inside a cylinder head cover, and a plurality of through holes are formed in a partition plate that partitions and forms the oil separator chamber, and a portion facing the opening of the through hole in the wall surface of the oil separator chamber A plurality of protrusions are formed on the plate. Oil mist is separated by blow-by gas flowing into the oil separator chamber from the through hole colliding with the protrusion.

  Moreover, in patent document 2, the blow-by gas inflow port is formed in the baffle plate which divides and forms an oil separator chamber. The oil separator chamber is provided with a nozzle, and a collision plate is provided on the downstream side of the nozzle. The blow-by gas that has flowed into the oil separator chamber from the blow-by gas inlet passes through the nozzle and collides with the collision plate, whereby the oil mist is separated.

  Moreover, in patent document 3, the filter which consists of an aggregate | assembly of a fiber is arrange | positioned in the oil separator chamber. Oil mist is captured by this filter.

JP 2000-45750 A JP 2010-144676 A JP 2010-248935 A

  By the way, in patent document 1, blow-by gas is made to distribute | circulate through the through-hole of a partition plate aiming at raising the flow velocity of blow-by gas and making it collide with a protrusion. However, since the partition plate is thin, the length of the through hole is shortened, and it is considered that the flow rate of blow-by gas cannot be sufficiently increased. If the flow velocity of blow-by gas is not sufficiently increased, the collision speed with the protrusions is lowered and the oil mist separation performance is lowered.

  Therefore, it is conceivable to provide a nozzle in the oil separator chamber as in Patent Document 2. However, in Patent Document 2, since the blow-by gas that has flowed in from the blow-by bus inlet of the baffle plate is caused to flow into the nozzle, the blow-by gas passes through the throttle twice. Therefore, there is a possibility that the flow velocity does not increase so much.

  In addition, when oil mist is captured by a filter made of a fiber assembly as in Patent Document 3, the pressure loss of blow-by gas increases, the gas flow rate decreases, and the oil mist separation performance decreases. It is possible to do.

  This invention is made | formed in view of this point, The place made into the objective is to improve the isolation | separation performance of an oil mist.

In order to achieve the above object, the first invention provides:
In the oil separator (1) that removes oil from the gas mixed with oil mist,
A first passage (11) through which the gas flows;
A second passage (12) communicating with the downstream side of the first passage (11),
The second passage (12) extends in a direction intersecting the downstream side of the first passage (11),
The length of the first passage (11) is set longer than the inner diameter of the first passage (11).

  According to this configuration, the gas mixed with oil mist flows through the first passage and reaches the second flow path. Since the length of the first passage is longer than the inner diameter, the gas flow rate can be sufficiently increased in the first passage. When the gas mixed with oil mist reaches the second passage, the second passage collides with the wall surface of the second passage because it intersects the downstream side of the first passage. Thereby, since oil mist becomes easy to adhere to the wall surface of a 2nd channel | path, the separation performance of oil mist increases. Since oil mist can be separated only by passing through the first passage and the second passage, there is little pressure loss and a sufficient gas flow rate is secured.

According to a second invention, in the first invention,
A cross-sectional area of the second passage (12) is set larger than a cross-sectional area of the first passage (11).

  According to this configuration, the gas flowing through the first passage vigorously flows into the second passage and the oil mist easily adheres to the wall surface of the second passage, so that the oil mist separation performance is enhanced.

According to a third invention, in the first or second invention,
At least one of the first passage (11) and the second passage (12) is formed in a porous material.

  According to this structure, since the hole which comprises a porous material will open to the wall surface of a 1st channel | path or a 2nd channel | path, oil mist will enter easily into opening of a wall surface, and isolation | separation of oil mist is accelerated | stimulated. .

According to a fourth invention, in any one of the first to third inventions,
At least one of the first passage (11) and the second passage (12) is formed between a passage forming member (3) and a housing (4) covering the passage forming member (3). It is characterized by being.

  According to this configuration, since the passage is formed by combining the passage forming member and the housing, the passage can be easily formed as compared with the case where all the passages are formed as one member.

The fifth invention is:
In the oil separator (1) that removes oil from the gas mixed with oil mist,
A first passage (11) through which the gas flows;
A porous material having at least one of the second passage (12) communicating with the downstream side of the first passage (11) is provided.

  According to this structure, since the hole which comprises a porous material will open to the wall surface of a 1st channel | path or a 2nd channel | path, isolation | separation of oil mist is accelerated | stimulated. Further, since the oil mist can be separated only by passing through the first passage and the second passage, there is little pressure loss and a sufficient gas flow rate is secured.

  According to the first aspect of the present invention, the first passage through which the gas flows and the second passage communicating with the downstream side of the first passage are provided, and the second passage intersects the downstream side of the first passage. Since the length of the first passage is longer than the inner diameter, the oil mist easily adheres to the wall surface of the second passage, and the oil mist separation performance can be enhanced.

  According to the second invention, since the cross-sectional area of the second passage is made larger than the cross-sectional area of the first passage, the oil mist separation performance can be further enhanced.

  According to the third aspect, since at least one of the first passage and the second passage is formed inside the porous material, separation of the oil mist can be promoted.

  According to the fourth aspect, since the passage is formed by combining the passage forming member and the housing, the formation of the passage can be facilitated as compared with the case where all the passages are formed as one member. .

  According to the fifth aspect, since at least one of the first passage and the second passage is formed in the porous material, the separation of the oil mist can be promoted to improve the separation performance of the oil mist.

2 is a partial cross-sectional view of a cylinder head cover including an oil separator according to Embodiment 1. FIG. It is an exploded view of a cylinder head cover. (A) is the figure which looked at the oil separator from the downstream of the 2nd channel, (b) is the figure which looked at the oil separator from the upstream of the 1st channel, (c) is the perspective view of an oil separator is there. FIG. 6 is a view corresponding to FIG. 1 according to a modification of the first embodiment. FIG. 3 is a view corresponding to FIG. 2 according to a modification of the first embodiment. FIG. 3 is a view corresponding to FIG. 1 according to a second embodiment. FIG. 3 is a view corresponding to FIG. 2 according to the second embodiment. FIG. 6 is a view corresponding to FIG. 1 according to the third embodiment. FIG. 9 is a view corresponding to FIG. 2 according to the third embodiment. FIG. 6 is a view corresponding to FIG. 1 according to a fourth embodiment. FIG. 6 is a view corresponding to FIG. 2 according to a fourth embodiment. 6 is a perspective view of an oil separator according to Embodiment 5. FIG. 7 is an exploded view of an oil separator according to Embodiment 5. FIG. 6 is a longitudinal sectional view of an oil separator according to Embodiment 5. FIG. 10 is a perspective view of a passage forming member of an oil separator according to Embodiment 5. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.
(Embodiment 1)
FIG. 1 is a cross-sectional view showing a cylinder head cover 100 including an oil separator 1 according to Embodiment 1 of the present invention. The cylinder head cover 100 is for covering a cylinder head of an internal combustion engine mounted on an automobile or the like. The cylinder head cover 100 includes a resin cover main body 101, a partition plate 102 assembled to the cover main body 101, and the oil separator 1. The cover main body 101 includes an upper wall portion 101a, a peripheral wall portion 101b extending downward from a peripheral edge portion of the upper wall portion 101a, and a flange portion 101c extending from a lower edge portion of the peripheral wall portion 101b. A recess 101d into which the peripheral edge of the partition plate 102 is fitted is formed on the lower surface of the flange 101c. A cylindrical portion 101e is formed on the upper wall portion 101a. The tube portion 101e is provided so as to penetrate the upper wall portion 101a. A blow-by gas pipe for introducing a blow-by bus into the cylinder is connected to the cylinder portion 101e.

  The partition plate 102 is for partitioning the blow-by gas outflow space R inside the cylinder head cover 100 and is made of a resin material. The partition plate 102 extends substantially parallel to the upper wall portion 101a of the cover main body 101. The partition plate 102 is formed with an attachment hole 102a to which the oil separator 1 is attached. The mounting hole 102 a has a substantially rectangular shape corresponding to the outer shape of the oil separator 1.

  The oil separator 1 is made of a porous material formed in a shape close to a substantially cube. The porous material can be obtained by, for example, expansion molding. That is, although not shown, the resin mold is filled with molten resin, and before the molten resin is completely solidified, the mold is moved in the mold opening direction to expand the molten resin to form a large number of holes inside. Thus, a porous material can be obtained. In addition, a porous material can be obtained by a known method.

  As shown in FIG. 3, nine first passages 11 and one second passage 12 are formed in the oil separator 1. Since the oil separator 1 is made of a porous material, holes forming the porous material are opened in the inner walls of the first passage 11 and the second passage 12.

  The upstream end openings of the first passages 11 are opened on the lower surface of the oil separator 1 so as to be lined up three by three vertically and horizontally. Each first passage 11 extends straight upward from the lower surface of the oil separator 1. The downstream end of the first passage 11 is positioned above the central portion in the vertical direction inside the oil separator 1. The downstream ends of all the first passages 11 have the same height. The length of the first passage 11 is set longer than the inner diameter of the first passage 11. In this embodiment, the length of the first passage 11 is at least three times the inner diameter of the first passage 11.

  The number of the first passages 11 is not limited to nine, but may be one or plural. Further, the cross section of the first passage 11 may be polygonal, circular, elliptical, star-shaped, or the like. Further, the first passage 11 may have a pyramid shape or a cone shape.

  The downstream end opening of the second passage 12 is opened at a portion higher than the central portion in the vertical direction on one side surface (the right side surface in FIG. 1) of the oil separator 1. The second passage 12 extends from the right side surface of the oil separator 1 to the left side, and extends in a direction intersecting with the extending direction on the downstream side of the first passage 11. The downstream end opening of the first passage 11 is opened on the lower surface of the second passage 12 so as to be aligned vertically and horizontally. The cross-sectional area perpendicular to the extending direction of the second passage 12 is set to be larger than the sum of the cross-sectional areas perpendicular to the extending direction of all the first passages 11. The cross-sectional area of the 2nd channel | path 12 is not restricted to a rectangle, Various polygons may be sufficient, and a round shape, an ellipse shape, a star shape, etc. may be sufficient.

  Further, the downstream end opening of the first passage 11 is positioned so as to face the upper wall portion of the second passage 12. The separation distance between the downstream end opening of the first passage 11 and the upper wall portion of the second passage 12 is set to be shorter than the length of the first passage 11. Specifically, the separation distance between the downstream end opening of the first passage 11 and the upper wall portion of the second passage 12 is ½ or less of the length of the first passage 11.

  The first passage 11 and the second passage 12 can be formed simultaneously with the formation of the oil separator 1 depending on the shape of the molding die, or after forming the oil separator 1 without the first passage 11 and the second passage 12, You may form the 1st channel | path 11 and the 2nd channel | path 12 by another process.

  Further, a projecting portion 1 b is formed on the lower side of the oil separator 1 at a position away from the lower end surface of the oil separator 1. The protruding portion 1b is a positioning portion that prevents the oil separator 1 from falling off by coming into contact with the opening peripheral edge of the mounting hole 102a of the partition plate 102 from above. The protrusion 1b may be provided on the entire circumference of the oil separator 1 or may be provided intermittently.

  As shown in FIG. 2, the lower portion of the oil separator 1 is fitted into the mounting hole 102 a of the partition plate 102, so that the oil separator 1 is attached to the partition plate 102. As shown in FIG. 1, the partition plate 102 to which the oil separator 1 is attached is fitted into the recess 101 d of the cover main body 101 and integrated with the cover main body 101. In this state, the oil separator 1 is positioned inside the outflow space R, and the upstream end opening of the first passage 11 opens to face the upper surface of the cylinder head, and the downstream end of the second passage 12 The opening opens so as to face the inside of the outflow space R.

  Next, the operation of the oil separator 1 configured as described above will be described. For example, blow-by gas leaking into the cylinder head cover 100 from between the piston ring and the cylinder wall surface contains oil mist, and the blow-by gas containing oil mist is upstream of the first passage 11 of the oil separator 1. It flows into the first passage 11 from the opening. The blow-by gas that has flowed into the first passage 11 flows upward through the first passage 11. At this time, since the length of the first passage 11 is longer than the inner diameter of the first passage 11 and is long enough to increase the flow rate of the blowby gas, the flow rate of the blowby gas is increased in the first passage 11. . The blow-by gas having an increased flow velocity in the first passage 11 flows into the second passage 12 vigorously. Since the separation distance between the downstream end opening of the first passage 11 and the upper wall portion of the second passage 12 is set to be shorter than the length of the first passage 11, the blow-by gas is supplied to the upper wall portion of the second passage 12. Clash with force. Thereby, the oil mist of blow-by gas is likely to adhere mainly to the upper wall portion of the second passage 12. If the amount of oil adhering to the upper wall portion of the second passage 12 increases, it becomes a droplet and is dropped and collected on the cylinder head side.

  Moreover, since the hole which comprises a porous material has opened in the inner wall of the 1st channel | path 11 and the 2nd channel | path 12, oil mist comes to enter a hole, and, thereby, isolation | separation of oil mist is accelerated | stimulated. A part of the oil mist flows through the wall surface of the second passage 12 to the inside of the outflow space R on the downstream side, and is dropped and collected from the opening hole (not shown) formed in the partition plate 102 to the cylinder head side. The

  The blow-by gas from which the oil mist has been separated flows out from the downstream end opening of the second passage 12 to the outflow space R, and then flows out of the cylinder head cover 100 from the cylinder portion 101e.

  As described above, the oil separator 1 according to the first embodiment includes the first passage 11 into which blow-by gas flows and the second passage 12 that communicates with the downstream side of the first passage 11. The second passage 12 extends in a direction intersecting the downstream side of the first passage 11, and the length of the first passage 11 is longer than the inner diameter, so that the oil mist becomes the wall surface of the second passage 12. The oil mist separation performance can be improved.

  In addition, since the first passage 11 and the second passage 12 are formed in the porous material, the oil mist is caused by the blow-by gas passing through the wall surface of the passage or a part of the blow-by gas flowing into the porous material. Separation can be promoted.

  In addition, since the oil separator 1 is made of a porous material, it can be made lightweight and highly rigid.

  As in Modification 1 shown in FIGS. 4 and 5, the partition plate portion 2 may be formed integrally with the lower portion of the oil separator 1. The partition plate portion 2 is the same as the partition plate 102 and has an opening hole (not shown) through which the above-described oil can flow. Thereby, the number of parts can be reduced. Moreover, since the partition plate part 2 also becomes a porous material, further weight reduction can be achieved.

  In Embodiment 1, the oil separator 1 is made of a porous material. However, the oil separator 1 is not limited to this and may be made of a solid material having no small holes.

  Further, the extending direction of the first passage 11 is not limited to the vertical direction, and may be a horizontal direction or may be inclined. In this case, the second passage 12 may be formed so as to extend in a direction intersecting the downstream side of the first passage 11.

(Embodiment 2)
6 and 7 show an oil separator 1 according to Embodiment 2 of the present invention. The oil separator 1 according to the second embodiment is different from the first embodiment in the manner of forming the first passage 11 and the second passage 12, and the other parts are the same as those in the first embodiment. Different parts will be described in detail.

  In the second embodiment, the oil separator 1 is configured by the passage forming member 3 in which the first passage 11 and the second passage 12 are formed, and the cylinder head cover (housing) 4.

  The cylinder head cover 4 includes an upper wall portion 4a, a peripheral wall portion 4b extending downward from a peripheral edge portion of the upper wall portion 4a, and a flange portion 4c extending from a lower edge portion of the peripheral wall portion 4b. A recess 4d is formed on the lower surface of the flange portion 4c. A cylindrical portion 4e to which blow-by gas piping is connected is formed on the upper wall portion 4a.

  The upper wall portion 4a is provided with a vertical plate portion 4f for forming the first passage 11. The vertical plate portion 4f protrudes downward from the lower surface of the upper wall portion 4a.

  The passage forming member 3 is made of a porous material formed in a shape close to a substantially rectangular parallelepiped. In the lower portion of the passage forming member 3, a partition plate portion 3a is integrally formed as in the modification of the first embodiment, and an opening hole (not shown) through which the above-described oil can flow is formed. A plurality of first passages 11 are formed inside the passage forming member 3. A first groove portion 3b for forming the first passage 11 is formed on the left side surface (left side surface in FIG. 7) of the passage forming member 3 so as to extend in the vertical direction. A second groove 3c for forming the second passage 12 is formed on the upper surface of the passage forming member 3 so as to extend in the left-right direction.

  When the passage forming member 3 is assembled to the upper wall portion 4a of the cylinder head cover 4 from below, the open side of the first groove portion 3b of the passage forming member 3 is covered by the vertical plate portion 4f of the cylinder head cover 4 to form the first passage 11. At the same time, the open side of the second groove 3c of the passage forming member 3 is covered by the upper wall portion 4a of the cylinder head cover 4 to form the second passage 12. That is, the first passage 11 and the second passage 12 are formed between the passage forming member 3 and the cylinder head cover 4 that covers the passage forming member 3. Thereby, compared with the case where all of the 1st channel | path 11 and the 2nd channel | path 12 are formed in one member (channel | path formation member 3), formation of the 1st channel | path 11 and the 2nd channel | path 12 becomes easy.

  According to the oil separator 1 according to the second embodiment, as in the first embodiment, the second passage 12 extends in a direction intersecting the downstream side of the first passage 11, and the length of the first passage 11 is increased. Since it is longer than the inner diameter, the oil mist is likely to adhere to the wall surface of the second passage 12 and the oil mist separation performance can be enhanced.

  Although not shown, oil mist separation performance is achieved by forming irregularities and baffles on the upper side surface of the second passage 12 on the back side of the upper wall portion 4a of the cylinder head cover 4 and the inner side surface of the vertical plate portion 4f. Can be further increased.

(Embodiment 3)
8 and 9 show an oil separator 1 according to Embodiment 3 of the present invention. The oil separator 1 according to the third embodiment is different from the first embodiment in the shapes of the first passage 11 and the second passage 12, and the other parts are the same as those in the first embodiment. The part will be described in detail.

  The partition plate 102 is formed with an inlet 102 b for allowing blow-by gas to flow into the outflow space R upstream of the oil separator 1. The opening area of the introduction port 102b is set to be sufficiently larger than the sum of the sectional areas of all the first passages 11 of the oil separator 1.

  Further, a protrusion 102d for positioning and fixing the oil separator 1 is formed on the upper surface of the partition plate 102. The protruding portion 102 d is formed so as to surround the outer periphery of the lower portion of the oil separator 1. The lower part of the oil separator 1 is fitted inside the protrusion 102d.

  The upstream end opening of the first passage 11 opens on the left side surface of the oil separator 1. The first passage 11 extends straight from the left side surface of the oil separator 1 to the right. The downstream end of the first passage 11 is positioned at the middle portion in the left-right direction inside the oil separator 1.

  The upstream end of the second passage 12 communicates with the downstream end of the first passage 11 and is positioned at the middle portion in the left-right direction inside the oil separator 1. The second passage 12 extends downward from the communication portion with the first passage 11, then extends straight to the right, and opens on the right side surface of the oil separator 1. That is, the upstream side of the second passage 12 extends in a direction intersecting the downstream side of the first passage 11.

  The cross-sectional area of the second passage 12 is set larger than the cross-sectional area of the first passage 11.

  In Embodiment 3, blow-by gas containing oil mist flows into the outflow space R upstream of the oil separator 1 from the inlet 102b, and then from the upstream end opening of the first passage 11 of the oil separator 1 to the first passage. 11 flows in. The blow-by gas that has flowed into the first passage 11 flows downstream through the first passage 11. At this time, since the length of the first passage 11 is longer than the inner diameter of the first passage 11, the flow rate of blow-by gas is increased in the first passage 11. The blow-by gas having an increased flow velocity in the first passage 11 vigorously flows into the second passage 12 and thus collides with the wall surface of the second passage 12 vigorously. Thereby, the oil mist of blow-by gas is likely to adhere to the wall surface of the second passage 12.

  As described above, according to the oil separator 1 according to the third embodiment, the oil mist easily adheres to the wall surface of the second passage 12 as in the first embodiment. Can be increased.

(Embodiment 4)
10 and 11 show an oil separator 1 according to Embodiment 4 of the present invention. The oil separator 1 according to the fourth embodiment is different from the second embodiment in the shapes of the first passage 11 and the second passage 12 and the other parts are the same as those in the second embodiment. The part will be described in detail.

  A wall portion 4 g for forming the second passage 12 is provided on the upper wall portion 4 a of the cylinder head cover (housing) 4. The wall portion 4g protrudes downward from the lower surface of the upper wall portion 4a and is formed so as to surround a substantially upper half portion of the protruding tube portion 3c provided in the passage forming member 3.

  The passage forming member 3 is made of a porous material, and a partition plate portion 3a is integrally formed at the lower portion of the passage forming member 3 as in the modification of the first embodiment, and the above-described oil can be distributed. An open hole (not shown) is formed. A plurality of protruding tube portions 3c are formed on the passage forming member 3 so as to protrude upward. A first passage 11 is formed in each protruding tube portion 3c so as to extend in the vertical direction. The upper end portion of the protruding tube portion 3 c, that is, the downstream end opening of the first passage 11 is located downward from the lower surface of the upper wall portion 4 a of the cylinder head cover 4. Further, a predetermined gap is formed between the outer peripheral surface of the protruding tube portion 3 c and the wall portion 4 g of the cylinder head cover 4.

  The second passage 12 is formed between the upper end portion of the protruding tube portion 3 c and the upper wall portion 4 a of the cylinder head cover 4, and between the outer peripheral surface of the protruding tube portion 3 c and the wall portion 4 g of the cylinder head cover 4. . The second passage 12 is formed so as to extend toward the wall portion 4g along the upper wall portion 4a of the cylinder head cover 4 and then extend downward along the wall portion 4g. That is, the upstream side of the second passage 12 extends in a direction intersecting the downstream side of the first passage 11.

  In the fourth embodiment, when blow-by gas containing oil mist flows into the first passage 11, the length of the first passage 11 is longer than the inner diameter of the first passage 11. It rises in the passage 11. The blow-by gas having an increased flow velocity in the first passage 11 vigorously flows into the second passage 12 and thus collides with the wall surface of the second passage 12 vigorously. Thereby, the oil mist of blow-by gas is likely to adhere to the wall surface of the second passage 12.

  As described above, according to the oil separator 1 according to the fourth embodiment, the oil mist easily adheres to the wall surface of the second passage 12 as in the first embodiment. Can be increased.

  In the fourth embodiment, the protruding pipe portion 3c is formed. However, the present invention is not limited to this. For example, the first passage 11 is formed in a porous material formed in a shape close to a substantially cubic shape as in the first embodiment. You may do it. Moreover, the wall part 4g may be formed intermittently.

  Although not shown, oil mist separation performance is achieved by forming irregularities and baffles on the upper side surface of the second passage 12 on the back surface of the upper wall portion 4a of the cylinder head cover 4 and the inner side surface of the wall portion 4g. It can be further increased.

(Embodiment 5)
12 to 15 show an oil separator 1 according to Embodiment 5 of the present invention. The oil separator according to the fifth embodiment is different from that according to the first embodiment in that the oil separator is configured by housing the passage forming member 7 in the first case component (housing) 5 and the second case component 6.

  By combining the first case component 5 and the second case component 6, a substantially cubic case is obtained. The first case component 5 is larger than the second case component 6.

  An inflow pipe 5 a for allowing blow-by gas mixed with oil mist to flow in is formed on the lower wall portion of the first case component 5. The cross-sectional area of the inflow pipe 5 a is set to be larger than the sum of the cross-sectional areas of all the first passages 11. The side wall portion of the second case component 6 is formed with an outflow pipe 6a for allowing the gas inside the case to flow out and an oil outflow pipe 6b through which the separated oil mist flows out.

  The passage forming member 7 is made of a porous material. As shown in FIGS. 14 and 15, a plurality of first passages 11 are formed in the passage forming member 7 so as to penetrate in the vertical direction. A first groove 7a for forming the first passage 11 is formed on the side surface of the passage forming member 7 so as to extend in the vertical direction. A second groove 7b for forming the second passage 12 is formed on the upper surface of the passage forming member 7 so as to extend in the left-right direction.

  As shown in FIG. 14, when the passage forming member 7 is assembled inside the first case constituent member 5 and the second case constituent member 6, the open side of the first groove 7 a of the passage forming member 7 is the first case constituent member 5. The first passage 11 is formed by being covered with the inner side surface, and the second passage 12 is formed by covering the open side of the second groove portion 7b of the passage forming member 7 with the upper wall portion of the first case constituent member. That is, the first passage 11 and the second passage 12 are formed between the passage forming member 7 and the first case constituent member 5 that covers the passage forming member 7. Thereby, compared with the case where all of the 1st channel | path 11 and the 2nd channel | path 12 are formed in one member (channel | path formation member 7), formation of the 1st channel | path 11 and the 2nd channel | path 12 becomes easy.

  The first passage 11 extends in the up-down direction, while the second passage 12 extends in the left-right direction. Accordingly, the second passage 12 extends in a direction intersecting the downstream side of the first passage 11. Further, the length of the first passage 11 is set longer than the inner diameter of the first passage 11.

  Moreover, the internal space of the 1st case structural member 5 and the 2nd case structural member 6 is divided into the inflow side and outflow side of blow-by gas. Therefore, blow-by gas that has flowed into the internal space of the first case component 5 and the second case component 6 from the inflow pipe 5 a flows into the first passage 11. Since the length of the first passage 11 is longer than the inner diameter of the first passage 11, the flow rate of blow-by gas is increased in the first passage 11. The blow-by gas having an increased flow velocity in the first passage 11 vigorously flows into the second passage 12 and thus collides with the wall surface of the second passage 12 vigorously. Thereby, the oil mist of blow-by gas is likely to adhere to the wall surface of the second passage 12.

  Further, the oil flows from the wall surface of the second passage 12 along the inner surface of the second case component 6 and flows out from the oil outflow pipe 6b. At that time, as shown in FIG. 14, in order to prevent the separated oil from coming out together with the gas from the outflow pipe 6a, a protruding portion 6c protruding toward the inside of the case at the upstream end opening periphery of the outflow pipe 6a. Is forming. Since the protrusion 6c is formed so as to surround the upstream end opening of the outflow pipe 6a, the oil transmitted through the wall surface of the second passage 12 does not easily enter the outflow pipe 6a.

  As described above, according to the oil separator 1 according to the fifth embodiment, the oil mist easily adheres to the wall surface of the second passage 12 as in the first embodiment. Can be increased.

  Although not shown, oil mist separation performance can be further enhanced by forming irregularities, baffles and the like on the upper side surface of the second passage 12 on the back side of the upper wall portion of the first case component 5. .

  Moreover, the hole which comprises a porous material in the inner surface of the 1st case structural member 5 may open.

  Further, by making the passage forming member 7 a porous material, the oil mist is separated from the gas that has entered inside from the inner wall of the first passage 11, and is discharged from the oil discharge pipe 6 b along the outer periphery of the passage forming member 7. The

  In the above embodiment, the case where the oil mist is separated from the blow-by gas mixed with the oil mist has been described. However, the present invention is not limited thereto, and the present invention is applied to the case where the oil mist is separated from the gas mixed with various oil mists. can do.

  The above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the oil separator according to the present invention can be used, for example, when separating oil mist from blow-by gas mixed with oil mist.

1 Oil separator 3 Passage forming member 4 Cylinder head cover (housing)
11 First passage 12 Second passage

Claims (5)

In the oil separator (1) that removes oil from the gas mixed with oil mist,
A first passage (11) through which the gas flows;
A second passage (12) communicating with the downstream side of the first passage (11),
The second passage (12) extends in a direction intersecting the downstream side of the first passage (11),
The length of the said 1st channel | path (11) is set longer than the internal diameter of the said 1st channel | path (11), The oil separator (1) characterized by the above-mentioned. In the oil separator (1) according to claim 1,
The oil separator (1), wherein a cross-sectional area of the second passage (12) is set larger than a cross-sectional area of the first passage (11). In the oil separator (1) according to claim 1 or 2,
An oil separator (1), wherein at least one of the first passage (11) and the second passage (12) is formed inside a porous material. In the oil separator (1) according to any one of claims 1 to 3,
At least one of the first passage (11) and the second passage (12) is formed between a passage forming member (3) and a housing (4) covering the passage forming member (3). An oil separator (1) characterized by comprising: In the oil separator (1) that removes oil from the gas mixed with oil mist,
A first passage (11) through which the gas flows;
An oil separator (1) comprising a porous material formed with at least one of a second passage (12) communicating with the downstream side of the first passage (11).

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