JPH08319814A - Oil trapper for internal combustion engine - Google Patents

Abstract

PURPOSE: To prevent emulsification of oil while separating oil mist surely in a simple structure. CONSTITUTION: An outlet pipe 2 is arranged in a first cylindrical part 1a having a cylindrical surface on the inside thereof and for enclosely forming a first separating chamber 11 so as to open one opening end, and a second separating chamber 12 is enclosely formed around the outlet pipe 2 by a third cylindrical part 1b. An inlet port 5a is opened in the tangent direction of the cylindrical surface of the first separating chamber 11, and inlet port pipe 5 is formed so as to open out the third cylindrical part 1b penetrating the second separating chamber 12. The other opening end of the outlet pipe 2 is communicated with an outside, and the first separating chamber 11 is directly communicated with the outside of a main body. Oil mist communicated with the outside through the second separating chamber 12 and which is included in gas led from the inlet pipe 5 is separated in the first separating chamber 11, and also the oil mist is discharged to the outside by separating it in the second separating chamber 12.

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 which is supplied to a blowby gas reducing device to separate oil mist in blowby gas.

[0002]

2. Description of the Related Art In a crankcase of an internal combustion engine, blow-by gas leaking from the combustion chamber exists, and the gas component thereof causes deterioration of engine oil and the like. A blow-by gas reduction device that burns is used. This device is, for example, a shield system that connects a crankcase and an air cleaner with a hose, and a PCV (Positive Crankcase Ven).
tilation: That is, forced ventilation of the crankcase) The crankcase and the intake system are communicated via a valve, and the PCV system is forcibly ventilating the crankcase while controlling the flow rate of blow-by gas by negative intake pressure.

Since the blow-by gas contains an oil mist in which the engine oil is atomized, it is not suitable for re-combustion as it is, and the engine oil consumption increases. Therefore, it is necessary to separate the oil mist in the blow-by gas before returning the blow-by gas to the intake system, and an oil drop separating device called an oil trapper, an oil separator, or the like is provided. As such an oil trapper, various types are known, but an external oil trapper (shown in FIG. 6) mounted on the outside of the engine block and an internal oil trapper housed in the cylinder head cover. A type of oil trapper (not shown) is known.

As the above 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 from the inlet port IP into the cyclone chamber (centrifugal chamber) CC, and is swirled to the outside through the outlet passage OP in the central portion. It is discharged and 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 during the swirling motion, and is collected in the oil reservoir chamber along the wall surface of the cyclone chamber CC.

[0005]

However, even in the oil trapper described above, the blow-by gas is discharged through the outlet passage OP.
When discharged through the, the oil adhered to the outer wall of the outlet passage is caught in the inner wall side of the outlet passage, and is mixed with the blow-by gas by the swirling flow of the blow-by gas in the outlet passage,
There is a phenomenon that it is sucked into the intake system as it is.

Further, when the blow-by gas is introduced into the above-mentioned 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. In, the water in the blow-by gas introduced becomes water drops, and this mixes with the oil component to form a colloid state. That is, so-called oil emulsification occurs, and if this is mixed with oil in the internal combustion engine and reused, the oil deteriorates.

Therefore, the present invention reliably and simply
An object of the present invention is to provide a cyclone type oil trapper for an internal combustion engine, which can separate oil mist in a fluid such as blow-by gas and prevent oil emulsification.

[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. A second tubular body having open ends at both ends thereof, the second tubular body being arranged so that one open end is open in the first tubular body and the other open end extends outside the first tubular body; A third cylinder that surrounds a second cylinder outside the first cylinder and at least a part of the first cylinder, and defines a second separation chamber around the second cylinder. An inlet port is formed in the first cylinder so as to open in the tangential direction of the body and the cylindrical surface of the portion surrounded by the third cylinder, and penetrates the second separation chamber. An inlet pipe formed so as to open outside the third tubular body is provided, the other open end of the second tubular body communicates with the outside, and the first tubular body is provided.
The separation chamber is directly communicated with the outside, and the separation chamber is communicated with the outside through 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 configured. You can

[0010]

Thus, in the oil trapper for an internal combustion engine of the present invention, the inlet pipe is communicatively connected to, for example, the crankcase of the internal combustion engine, and the other open end of the second cylinder is the intake air of the internal combustion engine. Connected to the system. As a result, the blow-by gas in the crankcase is tangentially introduced from the inlet pipe into the first separation chamber via the inlet port, and while swirling, the blow-by gas is opened from one opening end of the second cylinder to the other opening. It is discharged in the end direction and sucked into the intake system of the internal combustion engine. Due to the swirling motion at this time, a centrifugal force is applied to the oil mist in the blow-by gas, 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.
Further, when the blow-by gas is discharged from one opening end of the second cylinder toward the other opening end, the separated oil adhering to the outer wall of the second cylinder is entangled in the inner wall side and becomes blow-by gas. When mixed, this oil is further separated in the second separation chamber and discharged to the outside.

In this case, the blow-by gas is introduced into the oil trapper and immediately comes into contact with the inner wall surface of the first separation chamber, but the first cylindrical body which defines the first separation chamber At least the inlet port is surrounded by the third cylinder, and since the second separation chamber is interposed between the outside and the outside, 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 by the inner wall surface thereof, and the above-mentioned oil emulsification does not occur, and the separation action of the oil mist is appropriately performed. The separated oil thus discharged to the outside can be separately returned to the internal combustion engine.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of an oil trapper for an internal combustion engine of the present invention will be described below with reference to the drawings. 1 to 3 relate to an embodiment of the present invention and show a cyclone type oil trapper with an external 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 cylinder and the third cylinder according to the present invention, and the outlet pipe 2 including the second cylinder according to the present invention. The two parts are joined together while the parts are accommodated.

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

On the side of the open end 1d of the first tubular portion 1a, an inlet pipe 5 is formed integrally with the main body 1 by penetrating the third tubular portion 1b. The inlet port 5a opens in the 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 and 7 integrally formed on a cylindrical body connected through a pair of connecting portions 2c and 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 portion 6 is joined to the open end 1d of the first cylindrical body portion 1a, and the other flange portion 7 has a flange portion 7f, which is intimately joined to the flange portion 1f of the main body 1. As shown in FIG. 1, the upper surface of the collar portion 6 is a tapered surface, and a smooth surface extending from the outside of the communication hole 2e of the outlet pipe 2 to the flow path 13 is formed.

When the outlet pipe 2 is joined to the main body 1, the structure shown in FIG. 1 is formed, and the first separation chamber 11 is defined inside the first cylindrical portion 1a on the side of the open end 1d. Be done and first
The second separation chamber 12 is defined between the cylindrical body portion 1a and the third cylindrical body portion 1b, and the first separation chamber 11 is connected to the crank 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) for communication, and has an outlet 1
It is configured to directly communicate with the outside through g, and also communicate with the outside through the communication hole 2e, the second separation chamber 12, the flow path 13 and the discharge port 1h. The outlets 1g, 1h
On the other hand, a Y-shaped rubber hose 4 may be commonly connected to communicate with the outside.

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

The blow-by gas is introduced into the first separation chamber 11 through the inlet port 5a and comes into contact with the inner surface of the first cylindrical body portion 1a, but the first cylindrical body portion 1a is the third cylindrical body portion. Part 1
Since it is surrounded by b and the second separation chamber 12 is interposed between the outside and the outside, it does not come into contact with the outside air and is not directly cooled by the outside air temperature. Therefore, the first
In the blow-by gas introduced into the separation chamber 11, the oil mist is separated without being rapidly cooled on the inner surface of the first tubular portion 1a, and the oil is not emulsified.

Further, when the blow-by gas is discharged from the opening end 2a of the outlet pipe 2 toward the opening end 2b, the opening end 2a is opened.
When the separated oil adhering to the outer wall on the side of the inner wall is entrained in the inner wall and mixed in the blow-by gas, this oil is generated by the weak swirling flow of the blow-by gas in the outlet pipe 2
It is introduced from the e into the second separation chamber 12 and separated from the gas, and the separated oil is the collar portion 6, the flow path 13, and the discharge port 1h.
It is discharged to the outside via.

The separated oil thus taken out is, for example, Y which is commonly connected to the discharge ports 1g and 1h.
It is returned into the oil pan (not shown) through the V-shaped rubber hose 4. However, when the distance from the discharge ports 1g and 1h to the gathering portion of the Y-shaped rubber hose 4 is short, a flow occurs from the discharge port 1h to the discharge port 1g, and the separated oil causes the rubber hose 4 to flow.
It will be returned to the inside of the 1st cylinder part 1a via. In order to prevent this, the distance to the gathering portion of the rubber hoses 4 may be set to a sufficient length, or separate rubber hoses may be provided.

As is apparent from FIG. 1, in the present embodiment, the wall thickness of the third cylindrical portion 1b is such that the outside temperature is the second separation chamber 12b.
It is formed thick so that it is difficult to be transmitted inside. In the present embodiment, the main body 1 is formed by integrally forming the first and third tubular bodies of the present invention and has the first tubular body portion 1a and the third tubular body portion 1b, but the first and second tubular bodies are formed. The tubular body is integrally formed, and the third tubular body is joined to the tubular body, or the second and third tubular bodies are integrally formed, and the first tubular body is joined to the tubular body. You can also Of course, the first to third cylinders may be formed separately and combined together.

FIG. 4 relates to another embodiment of the present invention, which is a main body 1
The fourth cylindrical body portion 1k is integrally formed around the third cylindrical body portion 1b, and the annular chamber 14 is defined between the both. The inlet pipe 5 includes the third and fourth cylindrical body portions 1b, 1
It extends through k through to the outside. Thus, according to this embodiment, the first tubular portion 1a is doubly surrounded by the second annular chamber 12 and the annular chamber 14,
The influence of the outside air temperature on the cylindrical body portion 1a is almost negligible.

With respect to the outlet pipe 2 in each of the above-described embodiments, the connecting portion 2c is inclined with respect to the axial direction of the outlet pipe 2 as shown in FIG. A structure in which the separation end surface is long may be used.

[0024]

Since the present invention is configured as described above, it has the following effects. That is, the oil trapper for an internal combustion engine of the present invention defines the first and second separation chambers, and at the same time, through the inlet pipe penetrating the second separation chamber and opening outside the third cylindrical body. Since the blow-by gas is introduced into the first separation chamber, it is possible to reliably separate the oil mist while preventing the emulsification of the oil with a simple structure.

[Brief description of drawings]

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

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

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

FIG. 4 is a vertical 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 the 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 cylindrical body part (1st cylindrical body) 1b 3rd cylindrical body part (3rd cylindrical body) 1k 4th cylindrical body part 2 Exit pipe (2nd cylindrical body) 4 Rubber hose 5 Inlet pipe 6,7 Collar 11 First separation chamber 12 Second separation chamber 13 Flow path 14 Annular chamber

Claims (1)

[Claims] 1. A first cylindrical body having a cylindrical surface inside and defining a first separation chamber, and open ends at both ends, wherein one open end is opened in the first cylindrical body. A second tubular body arranged so that the other open end extends outside the first tubular body;
A third tubular body surrounding the second tubular body outside the first tubular body and surrounding at least a part of the first tubular body, and defining a second separation chamber around the second tubular body. Forming an inlet port in the first cylinder so as to open in a tangential direction of the cylindrical surface of a portion surrounded by the third cylinder, and penetrating the second separation chamber to form the inlet port. 3 is provided with an inlet pipe formed to open outside the tubular body, the other open end of the second tubular body is communicated with the outside, and the first separation chamber is directly communicated with the outside. An oil trapper for an internal combustion engine, characterized in that the oil trapper communicates with the outside through two separation chambers.