JP2007100567A - Gas-oil separator of blow-by gas - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas-oil separator of blow-by gas for improving gas-oil separation performance with simple structure in the gas-oil separator of the blow-by gas. <P>SOLUTION: This invention on the claim item 1 is the gas-oil separator of the blow-by gas installed in an engine and separating gas from oil of oil mist in the blow-by gas flowing out in a crankcase of the engine, and is characterized by arranging an oil sticking part on a wall forming a blow-by gas flow passage for flow-down of the flowing-in blow-by gas. In the invention on the claim item 2, the gas-oil separator of the blow-by gas described in the claim item 1 is characterized in that the oil sticking part is composed of a plurality of projection pieces erected on the wall. In the invention on the claim item 3, the gas-oil separator of the blow-by gas recorded on the claim item 2 is characterized by forming a plurality of projection pieces struck up by forming a notch in a plate by installing the plate on the wall. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a blow-by gas oil / oil separation device with a simple structure and improved oil / oil separation performance.

As the diesel engine (hereinafter referred to as “engine”) is driven, blow-by gas flows into the crankcase from the gap between the cylinder and the piston, but oil mist is mixed in the blow-by gas flowing into the crankcase.
Therefore, as a measure to prevent HC emission, conventionally, a blow-by gas trapped in the crankcase is introduced into a rocker cover that attaches to the upper part of the cylinder head, and an oil-oil separation device in which oil mist in the blow-by gas is built into the rocker cover. The oil mist is separated by introducing a blow-by gas into a gas / oil separation device externally attached to the engine.

  As a gas oil separating device built in a rocker cover, there is known a gas oil separating device 1 having a labyrinth structure shown in Patent Document 1 or FIGS. 4 and 5, and this gas oil separating device 1 is provided in a rocker cover 3. In addition, the blow-by gas flow path 9 is provided by alternately arranging a plurality of partition walls (partition plates) 7 in the breather chamber 5 so as to reduce the pressure of the blow-by gas G. A large surface area is ensured.

The gas-oil separator 1 is configured so that the blow-by gas G flowing from the inlet 11 of the breather chamber 5 flows along the partition wall 7 through the blow-by gas flow path 9 and flows out from the outlet 13, and the oil in the blow-by gas G The mist is separated, and the separated oil is returned to the oil pan through a drain pipe (not shown).
6 and 7 show external-type gas / oil separators 15 and 17, and the gas / oil separator 15 shown in FIG. 6 has a cylindrical casing (shell) 21 by a single spiral partition wall 19. In the cyclone structure in which a spiral blow-by gas passage 23 is provided around the gas outflow pipe 25, the blow-by gas G flowing from the inlet 27 provided at the lower portion of the casing 21 flows down the spiral blow-by gas passage 23. As the oil flows out from the gas outlet pipe 25, the oil mist in the blow-by gas G is separated.

The gas-oil separation device 17 in FIG. 7 blows the blow-by gas whose flow velocity is increased by narrowing the flow path when the blow-by gas G flowing into the first chamber 32 of the casing 31 from the inflow pipe 29 flows into the second chamber 33. The blow-by gas G flows out from an outflow pipe 37 inserted in the second chamber 33 in a collision-type structure in which the gas G collides with a partition wall (partition plate) 35.
JP-A-9-112358

As described above, many air / oil separation devices having a labyrinth structure, a cyclone structure, and a collision structure have been proposed and implemented in many vehicles. However, 100% air / oil separation is impossible, and further, Actually, improvement in gas-oil separation performance and downsizing are desired.
The present invention has been devised in view of such circumstances, and an object of the present invention is to provide a blow-by gas / oil separation device with a simple structure and improved gas / oil separation performance.

In order to achieve such an object, the invention according to claim 1 is a blow-by gas air-oil separation device that attaches to an engine and separates oil mist in blow-by gas flowing into the crankcase of the engine. An oil adhering portion is provided on a wall that forms a blow-by gas flow path through which the blow-by gas that has flowed down flows.
The invention according to claim 2 is the blow-by gas gas-oil separator according to claim 1, wherein the oil adhering portion is composed of a plurality of projecting pieces standing on the wall. The invention according to No. 3 is the blow-by gas gas / oil separator according to claim 2, wherein a plate is attached to the wall, and a plurality of protruding pieces are formed on the plate by incision. It is characterized by.

Furthermore, the invention according to claim 4 is the blow-by gas / oil separator according to claim 2, characterized in that a plurality of projecting pieces are formed on the wall by direct incision. To do.
According to a fifth aspect of the present invention, in the blow-by gas gas-oil separator according to any one of the second to fourth aspects, the projecting piece is provided at a portion where the blow-by gas flowing down collides. According to a sixth aspect of the present invention, in the blow-by gas / oil separator according to any one of the second to fifth aspects, the projecting piece is a flow of the blow-by gas. It is characterized by being erected toward.

  The invention according to claim 7 is the blow-by gas gas-oil separator according to claim 1, wherein the oil adhering portion comprises a plurality of grooves formed in the wall. The invention according to claim 7 is characterized in that, in the blow-by gas / oil separator according to claim 7, the groove is provided at a portion where the blow-by gas collides.

According to the invention according to each claim, the air-oil separation performance is improved with a simple structure as compared with the conventional air-oil separation device, and as a result, the oil take-out amount of blow-by gas is reduced and the oil consumption is improved. It has an advantage that can be achieved.
Further, according to the inventions according to claims 2 to 8, by providing a plurality of protrusions and grooves on the wall forming the blow-by gas flow path, the oil adhesion area in the blow-by gas flow path can be increased. Compared to the conventional air / oil separator, the entire air / oil separator can be reduced in size.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIGS. 1 and 2 show an embodiment of a gas / oil separator according to claims 1 to 3 and claims 5 and 6, and this embodiment is a gas oil having the labyrinth structure already described in FIGS. 4 and 5. The present invention is applied to a separation device.
That is, in FIG. 1, 41 is an aluminum cast rocker cover that is attached to the upper part of the cylinder head of the engine, like the rocker cover 3 of FIG. 4, and a breather chamber 43 is defined in the inside thereof.

  As in the case of the gas / oil separator 1 in FIG. 5, a labyrinth gas / oil separation having a curved blow-by gas channel 47 in which a plurality of partition walls (partition plates) 45 are alternately arranged in the breather chamber 43. As shown in the drawing, blow-by gas G flowing from the inlet 51 of the breather chamber 43 flows down the blow-by gas passage 47 along the partition wall 45 and flows out from the outlet 53 as shown in the drawing. The oil mist inside is separated.

Although not shown, a communication path is provided between the crankcase and the breather chamber 43 of the rocker cover 41 as in the prior art, and the blow-by gas G discharged into the crankcase passes through the communication path. Through the breather chamber 43.
The air-oil separator 49 according to the present embodiment is provided with an oil adhering portion 55 in the partition wall 45 forming the blow-by gas flow path 47 in addition to the configuration similar to the conventional one as described above. It is intended to separate the gas oil.

As shown in FIG. 2, the oil adhering portion 55 is composed of a plurality of projecting pieces 59 erected in two upper and lower rows on one plate 57, and each projecting piece 59 cuts the plate 57 in the same direction. , And formed at the same angle.
Then, the plate 57 on which the plurality of projecting pieces 59 are erected is welded to the partition wall 45 and the oil adhesion portion 55 is provided on the partition wall 45. As shown in FIG. The blow-by gas G flowing down the flow path 47 is attached to the partition wall 45 where the blow-by gas G collides, and the protruding piece 59 is arranged so as to stand up toward the flow of the blow-by gas G.

Since the gas-oil separator 49 according to the present embodiment is configured in this way, the blow-by gas G discharged into the crankcase is guided to the breather chamber 43 from a communication path (not shown), and the inlet of the breather chamber 43 51 flows into the blow-by gas passage 47 of the gas-oil separator 49.
As shown in FIG. 1, the blow-by gas G repeatedly collides with the partition wall 45, and then flows down the blow-by gas flow path 47 along the partition wall 45 and flows out from the outlet 53. Since the partition wall 45 of the portion to be provided is provided with an oil adhering portion 55 composed of a plurality of projecting pieces 59 standing up toward the flow of the blow-by gas G, the blow-by gas G is applied to the projecting piece 59 (oil adhering portion 55). The oil mist in the blow-by gas G adheres to these projecting pieces 59 and collides more actively with the oil-oil separation than before.

Therefore, according to the present embodiment, the oil / oil separation performance is improved with a simple structure as compared with the oil / oil separation device 1 of FIG. 5, and as a result, the oil take-out amount of the blow-by gas G is reduced and the oil consumption is reduced. There is an advantage that improvement can be achieved.
Further, according to the present embodiment, by using a plurality of plates 57 provided with a plurality of protruding pieces 59 as described above, the oil adhesion area in the blow-by gas channel 47 can be increased. Compared to the separator, the gas oil separator can be downsized as a whole.

  The embodiment of FIGS. 1 and 2 is an embodiment in which the invention according to claims 1 to 3 and claims 5 and 6 is applied to the labyrinth-structured gas-oil separator described with reference to FIGS. However, the present invention is not limited to such a labyrinth structure. The cyclone-structured air / oil separator 15 described in FIG. 6 and the collision-type air / oil separator 17 described in FIG. Applicable.

That is, for example, in the gas-oil separator having a cyclone structure as shown in FIG. 6, it is applied to the spiral partition wall where the blow-by gas flowing down the blow-by gas flow path collides, the inner peripheral wall of the cylindrical casing, the upper back side inner wall, As described above, the gas-oil separation performance is improved by welding the plate 57 on which the plurality of protruding pieces 59 are erected.
In the gas / oil separator having the collision type structure shown in FIG. 7, the gas / oil separation performance is improved by welding the plate 57 having the above structure to the partition wall where the blow-by gas flowing into the second chamber collides. Will be.

  In addition, since the rocker cover 41 of FIG. 1 is cast from aluminum, the plate 57 having the above-described structure is separately welded to the partition wall (partition plate) 45. Conventionally, the aluminum cast rocker cover main body integrally formed with a plurality of partition walls is used. There is known a gas-oil separation device in which a lid made of a sheet metal having a plurality of partition walls attached thereto is attached, and a blow-by gas flow path having a labyrinth structure is formed by a partition wall on the rocker cover body side and a partition wall on the lid body side.

Thus, in the gas-oil separator having this structure, as in an embodiment of the fourth aspect of the present invention, a plurality of projecting pieces are erected by directly incising and raising the partition wall on the lid side made of sheet metal. And an oil adhering portion may be provided in the partition wall on the lid side.
Also with this structure, the intended purpose can be achieved as in the embodiment of FIG.

FIG. 3 shows an embodiment of a gas / oil separator according to claims 1, 7 and 8, and this embodiment also applies the present invention to a gas / oil separator having a labyrinth structure.
In this embodiment, instead of the plate 57 and the projecting piece 59 described above, a plurality of the partition walls 45 forming the blow-by gas flow path 47 are provided on the partition walls 45 where the flowing blow-by gas G collides. In this embodiment, four grooves 61 are provided in the vertical direction of the rocker cover 41, and the oil adhering portion 63 is formed by the plurality of grooves 61.

  Thus, even with the gas-oil separator 65 according to the present embodiment, the blow-by gas G repeatedly flows into the blow-by gas flow path 47 along the partition 45 and flows out from the outlet 53 while repeatedly colliding with the partition 45. However, since the plurality of grooves 61 are provided in the vertical direction of the rocker cover 41 in the partition wall 45 where the blow-by gas G collides, the flow of the blow-by gas G is disturbed in each groove 61. Oil mist in the blow-by gas G adheres to the inner wall of the groove 61, and positive gas-oil separation is achieved.

Therefore, according to this embodiment as well, the oil / oil separation performance is improved with a simple structure as compared with the oil / oil separation device 1 of FIG. 5, and as a result, the oil take-out amount of the blow-by gas G is reduced and the oil consumption is improved. There is an advantage that can be achieved.
In addition, according to the present embodiment, by providing the plurality of grooves 61 as described above in the partition wall 45, the oil adhesion area in the blow-by gas passage 47 can be increased. There is an advantage that the entire oil separator can be reduced in size.

  The embodiments of claims 7 and 8 are of course applicable to the cyclone structure oil / oil separator of FIG. 6 and the collision type oil / oil separator of FIG.

It is a principal part expanded sectional view of the gas-oil separator which concerns on one Embodiment of Claims 1 thru | or 3 and Claims 5 and 6. FIG. It is an expansion perspective view of an oil adhesion part. It is a principal part expanded sectional view of the gas-oil separator which concerns on one Embodiment of Claim 1, Claim 7, and Claim 8. It is a whole perspective view of the rocker cover incorporating a gas oil separation device. It is sectional drawing of the conventional oil-oil separation apparatus of a labyrinth structure. It is sectional drawing of the conventional gas oil separation apparatus of a cyclone structure. It is sectional drawing of the conventional gas-oil separator of a collision type structure.

Explanation of symbols

41 Locker cover 43 Breather chamber 45 Bulkhead (partition plate)
47 Blow-by gas passages 49 and 65 Gas-oil separators 55 and 63 Oil adhesion part 57 Plate 59 Projection piece 61 Groove

Claims (8)

A blow-by gas oil / oil separation device that attaches to a diesel engine and separates oil mist in the blow-by gas flowing into the crankcase of the diesel engine,
A blow-by gas / oil separation apparatus characterized in that an oil adhering portion is provided on a wall forming a blow-by gas flow path through which the blow-by gas flows.   The blow-by gas gas-oil separator according to claim 1, wherein the oil adhering portion comprises a plurality of projecting pieces standing on a wall.   The blow-by gas / oil separation device according to claim 2, wherein a plate is attached to the wall, and a plurality of projecting pieces are formed on the plate.   The blow-by gas-oil separation device according to claim 2, wherein a plurality of projecting pieces are formed by directly incising the wall.   The blow-by gas / oil separation device according to any one of claims 2 to 4, wherein the projecting piece is provided at a portion where blow-by gas flowing down collides with the blow-by gas.   The blow-by gas-oil separation device according to any one of claims 2 to 5, wherein the projecting piece is erected toward the flow of blow-by gas.   The blow-by gas gas-oil separator according to claim 1, wherein the oil adhering portion includes a plurality of grooves formed in the wall. The blow-by gas gas-oil separator according to claim 7, wherein the groove is provided in a portion where the blow-by gas collides.

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