JP3049269B2 - Oil trapper for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil trapper for an internal combustion engine, and more particularly to a cyclone type oil trapper for use in a blow-by gas reducing device for separating oil mist in blow-by gas.

[0002]

2. Description of the Related Art In a crankcase of an internal combustion engine, blow-by gas leaking from a combustion chamber is present, and the gas component causes deterioration of engine oil and the like. A blow-by gas reducing device for burning is used. This device includes, for example, a shield system that connects a crankcase and an air cleaner with a hose, and a PCV (Positive Crankcase Vendor).
Tilting (ie, forced ventilation of the crankcase) is roughly divided into a PCV system in which the crankcase and the intake system are connected via a valve, and the crankcase is forcibly ventilated while controlling the flow rate of the blow-by gas by the intake negative pressure.

[0003] In the blow-by gas, there is an oil mist in which engine oil is atomized, so that it is not suitable for reburning as it is, and the consumption of engine oil increases. For this reason, before returning the blow-by gas to the intake system, it is necessary to separate the oil mist in the blow-by gas, and an oil droplet separating device called an oil trapper, an oil separator or the like is provided. As such an oil trapper, various types are known, and an external oil trapper (shown in FIG. 6) which is mounted on the outside of an engine block and a built-in oil trapper which is housed in a cylinder head cover. A type of oil trapper (not shown) is known.

As the above-mentioned oil trapper, a so-called cyclone type trapper is widely used. This is configured, for example, as shown in FIG. 6, in which blow-by gas is introduced into the cyclone chamber (centrifugal separation chamber) CC from the inlet port IP, and moves out of the room through the central outlet passage OP while performing a swirling motion. The exhaust gas is sucked into the intake system of the internal combustion engine. At this time, the oil mist in the blow-by gas is separated by the centrifugal force generated at the time of the turning motion, and is collected in the oil reservoir along the wall surface of the cyclone chamber CC.

[0005]

However, in the above-described oil trapper, blow-by gas is not supplied to the outlet passage OP.
When the oil is discharged through, the oil attached to the outer wall of the outlet passage is caught on the inner wall side of the outlet passage, and is mixed into the blow-by gas by the swirling flow of the blow-by gas in the outlet passage,
There is a phenomenon that the air is directly sucked into the intake system.

Further, when blow-by gas is introduced into the oil trapper, the blow-by gas comes into contact with the inner wall surface of the cyclone chamber, so that when the outside air temperature is low and the members forming the cyclone chamber are cooled. The water in the introduced blow-by gas turns into water droplets, which are mixed with the oil component to form a colloid. That is, since so-called oil emulsification occurs, if this is mixed with the oil in the internal combustion engine and reused, the oil will deteriorate.

Therefore, the present invention provides a simple configuration and
It is an object of the present invention to provide a cyclone-type oil trapper for an internal combustion engine that can separate oil mist in a fluid such as blow-by gas and prevent emulsification of oil.

[0008]

In order to achieve the above object, an oil trapper for an internal combustion engine according to the present invention has a first cylindrical body having a cylindrical surface inside and defining a first separation chamber. Has open ends at both ends, and one open end extends into the first cylindrical body.
And a second cylindrical body open other open end is arranged so as to extend the first cylinder outside the body, with surrounding at least a portion of said first cylindrical body, the second A third cylindrical body that defines a second separation chamber around the cylindrical body, and a first cylindrical body that opens in a tangential direction of the cylindrical surface of a portion surrounded by the third cylindrical body. An inlet port is formed, and an inlet pipe is formed to penetrate the second separation chamber and open outside the third cylinder, and communicate the other open end of the second cylinder to the outside. And the second cylinder is connected to the first cylinder
And communicating with the second separation chamber outside the body, and communicated with the first isolation chamber directly to the outside, which is constituted so as to communicate with the outside via the second separation chamber.

In the oil trapper for an internal combustion engine,
The first cylinder and the third cylinder, the first cylinder and the second cylinder, or the second cylinder and the third cylinder are integrally formed. Can be.

[0010]

In the oil trapper for an internal combustion engine of the present invention, the inlet pipe is connected to, for example, a crankcase of the internal combustion engine, and the other open end of the second cylinder is connected to the intake port of the internal combustion engine. Connected to the system. As a result, the blow-by gas in the crankcase is introduced tangentially from the inlet pipe into the first separation chamber via the inlet port, and moves from one opening end to the other opening of the second cylinder while rotating. It is discharged in the end direction and is sucked into the intake system of the internal combustion engine. The centrifugal force is applied to the oil mist in the blow-by gas by the swirling motion at this time, the oil mist is separated along the inner wall surface of the first separation chamber, and most of the separated oil is directly discharged to the outside.
Also, when the blow-by gas is discharged from one opening end of the second cylinder to the other opening end, the separation oil attached to the outer wall of the second cylinder is caught in the inner wall, and is blown into the blow-by gas. If mixed, this oil is further separated in the second separation chamber and discharged outside.

In this case, it is the inner wall surface of the first separation chamber that comes into contact with the blow-by gas immediately after being introduced into the oil trapper. At least the inlet port is surrounded by the third cylinder, and the second separation chamber is interposed between the outside and the outside, so that it does not come into contact with the outside air and is directly cooled by the outside air temperature. There is no. Therefore, the blow-by gas introduced into the first separation chamber is not rapidly cooled on the inner wall surface, and the above-described emulsification of oil does not occur, and the oil mist is separated appropriately. The separated oil thus discharged to the outside can be separately returned to the internal combustion engine.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the oil trapper for an internal combustion engine according to the present invention will be described below with reference to the drawings. FIGS. 1 to 3 relate to an embodiment of the present invention and show a cyclone type oil trapper having an externally mounted engine block. As shown in FIG. 3, for example, two parts made of synthetic resin are combined.
That is, the main body 1 includes the first cylindrical body and the third cylindrical body according to the present invention, and the outlet pipe 2 constituting the second cylindrical body according to the present invention. Both are joined in a state where a part is accommodated.

The main body 1 of this embodiment is a double cylindrical body having a first cylindrical portion 1a and a third cylindrical portion 1b, and one opening end of the first cylindrical portion 1a has a small diameter and is discharged. An outlet 1g is formed, and the other open end 1d is formed with a large diameter, and a tapered portion 1c is formed between the two. An open end 1e on one end side of the third cylindrical body portion 1b has a flange portion 1f extending in the radial direction, and a bottom surface formed on the other end side inclined with respect to the axial direction. A channel 13 is formed. The flow path 13 is formed so as to communicate with the outside via an outlet 1h formed at the lowermost bottom of the third cylindrical body 1b.

On the opening end 1d side of the first cylindrical body 1a, an inlet pipe 5 is formed integrally with the main body 1 through the third cylindrical body 1b. An inlet port 5a is open in a tangential direction of the inner cylindrical surface of the body 1a.

On the other hand, as shown in FIG. 1, the outlet pipe 2 has flanges 6, 7 integrally formed on a cylindrical body connected via a pair of connecting portions 2c, 2c. In other words, a pair of communication holes 2e, 2e are formed between the connecting portions 2c, 2c forming a part of the cylindrical body. One flange 6 is joined to the open end 1d of the first cylindrical body 1a, and the other flange 7 has a flange 7f, which is tightly joined to the flange 1f of the main body 1. The upper surface of the flange 6 is a tapered surface as shown in FIG. 1, and a smooth surface extending from the outside of the communication hole 2 e of the outlet pipe 2 to the flow path 13 is formed.

When the outlet pipe 2 is joined to the main body 1, it is configured as shown in FIG. 1, and a first separation chamber 11 is formed on the side of the opening end 1d in the first cylindrical body 1a. And the first
A second separation chamber 12 is defined between the cylindrical body part 1a and the third cylindrical body part 1b, and the first separation chamber 11 is connected to the crankshaft of the internal combustion engine via the inlet pipe 5 and the outlet pipe 2, respectively. It is connected to a case (not shown) and an intake system (not shown),
In addition, it is configured to directly communicate with the outside through the g, and to communicate with the outside through the communication hole 2e, the second separation chamber 12, the flow path 13, and the discharge port 1h. In addition, the outlet 1g, 1h
Alternatively, a Y-shaped rubber hose 4 may be commonly used to communicate with the outside.

In the oil trapper of this embodiment having the above-described structure, the inlet pipe 5 is connected to the crankcase of the internal combustion engine and the open end 2b of the outlet pipe 2 is connected to the intake system of the internal combustion engine. You. Then, the blow-by gas in the crankcase is introduced tangentially into the first separation chamber 11 from the inlet port 5a, and is discharged from the open end 2a of the outlet pipe 2 to the open end 2b side while rotating in the same chamber. Is drawn into the intake system of the internal combustion engine. The centrifugal force is applied to the oil mist in the blow-by gas by the turning motion at this time, and the oil mist in the blow-by gas is separated along the inner wall surface of the first separation chamber 11, that is, the inner surface of the first cylindrical portion 1a. Discharged downward.

The blow-by gas is introduced from the inlet port 5a into the first separation chamber 11, and comes into contact with the inner surface of the first cylindrical portion 1a. Part 1
Since the second separation chamber 12 is interposed between the outside and the outside, the second separation chamber 12 is not in contact with the outside air and is not directly cooled by the outside air temperature. Therefore, the first
The blow-by gas introduced into the separation chamber 11 is not rapidly cooled on the inner surface of the first cylindrical portion 1a, and the oil mist is separated, so that the emulsification of oil does not occur.

Further, when the blow-by gas is discharged from the open end 2a of the outlet pipe 2 in the direction of the open end 2b, the open end 2a
When the separation oil adhering to the outer wall on the side is caught in the inner wall side and mixed into the blow-by gas, the oil is removed by the weak swirling flow of the blow-by gas in the outlet pipe 2.
e into the second separation chamber 12 to be separated from the gas, and the separated oil is supplied to the flange 6, the flow path 13, and the outlet 1h
Is discharged to the outside through

The separated oil taken out in this way is, for example, the Y oil commonly connected to the outlets 1g and 1h.
It is returned into an oil pan (not shown) via a rubber hose 4 in the shape of a letter. However, if the distance from the discharge ports 1g and 1h to the gathering portion of the Y-shaped rubber hose 4 is short, a flow from the discharge port 1h to the discharge port 1g occurs, and the separated oil is removed from the rubber hose 4
And is returned into the first cylindrical portion 1a. In order to prevent this, the distance to the collecting portion of the rubber hose 4 may be set to a sufficient length, or a separate rubber hose may be provided.

As is apparent from FIG. 1, in the present embodiment, the thickness of the third cylindrical portion 1b is set such that the outside air temperature is equal to that of the second separation chamber 12b.
It is formed thick so as not to be easily transmitted to the inside. In this embodiment, the main body 1 is formed integrally with the first and third cylinders of the present invention and has a first cylinder part 1a and a third cylinder part 1b. A cylindrical body is formed integrally and a third cylindrical body is joined thereto, or second and third cylindrical bodies are formed integrally and a first cylindrical body is joined thereto. You can also. Of course, the first to third cylinders may be formed separately and combined.

FIG. 4 shows a main body 1 according to another embodiment of the present invention.
A fourth cylindrical body 1k is integrally formed around the third cylindrical body 1b, and an annular chamber 14 is defined between them. The inlet pipe 5 is connected to the third and fourth cylindrical bodies 1b, 1
k and extends to the outside. Thus, according to the present embodiment, the first cylindrical body 1a is doubly surrounded by the second annular chamber 12 and the annular chamber 14, and the first cylindrical body 1a
The effect of the outside air temperature on the cylindrical body 1a is almost negligible.

As for the outlet pipe 2 in each of the above embodiments, the connecting portion 2c is formed to be inclined with respect to the axial direction of the outlet pipe 2 as shown in FIG. The structure may be such that the separation end surface is long.

[0024]

Since the present invention is configured as described above, the following effects can be obtained. That is, the oil trapper for an internal combustion engine of the present invention defines the first and second separation chambers, and further includes an inlet pipe that penetrates through the second separation chamber and opens outside the third cylinder. Since the blow-by gas is introduced into the first separation chamber, oil mist can be reliably separated while preventing emulsification of oil with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an oil trapper for an internal combustion engine according to one embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an exploded perspective view of an oil trapper for an internal combustion engine according to one embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of an oil trapper for an internal combustion engine according to another embodiment of the present invention.

FIG. 5 is a perspective view in which both ends of the outlet pipe are cut away to show another embodiment of the connecting portion of the outlet pipe in one embodiment of the present invention.

FIG. 6 is a schematic configuration diagram of a conventional cyclone type oil trapper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 1a 1st cylinder part (1st cylinder) 1b 3rd cylinder part (3rd cylinder) 1k 4th cylinder part 2 Outlet pipe (2nd cylinder) 4 Rubber hose 5 Inlet pipe 6, 7 Flange 11 First separation chamber 12 Second separation chamber 13 Flow path 14 Annular chamber

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F01M 13/04 B04C 5/12

Claims (1)

(57) [Claims] 1. A first cylindrical body having a cylindrical surface inside and defining a first separation chamber, and an open end at both ends, and one open end extends into the first cylindrical body. an opening and the other opening end surrounding the second tubular body arranged to extend in the first cylinder outside, the at least a portion of said first cylindrical body Te,
A third cylindrical body that defines a second separation chamber around the second cylindrical body, and the first cylindrical body that opens in a tangential direction of the cylindrical surface of a portion surrounded by the third cylindrical body. An inlet port is formed in the cylindrical body, and the third port extends through the second separation chamber.
An inlet pipe formed so as to open outside the cylindrical body, and communicating the other open end of the second cylindrical body to the outside ;
The second cylinder is placed outside the first cylinder in the second separation chamber.
And communicating, and the first separation chamber with directly communicating with the outside, said second oil trapper for an internal combustion engine, characterized in that through the separation chamber and configured to communicate with the outside.