JPH1018831A - Oil trapper for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To separate oil with certainty so as not to discharge oil mist included in introduced gas from an outlet pipe together with the gas in an oil trapper for an internal combustion engine provided with the outlet pipe on an upper portion of a main body, and an inlet pipe opened in a tagential direction. SOLUTION: A main body 1 has a cylindrical surface thereinside and a partitioned separation chamber SR, and a substantially perpendicular center axis. An outlet pipe 2 is so arranged that a lower opening is opened into the main body 1 and an upper opening is extended from the main body 1. An inlet pipe 3 is so arranged that an inlet port 3a is opened in a tangential direction of the cylindrical surface in the main body 1. A guide rib 5 is arranged for extending from an inner surface of an upper axial end of the main body 1 to the lower direction, and being led from the portion near the inlet port 3a along an outer periphery of the outlet pipe 2 to an inner wall surface of the main body 1. Blowby gas is introduced from the inlet pipe 3 into the separation chamber SR for separating the oil which is then properly guided by the guide rib 5 for discharging outside the main body 1.

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 (not shown) mounted on the outside of an engine block and a built-in oil trapper housed in a cylinder head cover. An oil trapper (not shown) is known.

As the above-mentioned oil trapper, a so-called cyclone type trapper is known. For example, as shown in FIGS. 4 to 6, a main body 10 having a cylindrical surface inside and defining a separation chamber is provided. Are arranged substantially vertically, and the main body 10
The lower opening is open and the upper opening is the main body 10.
An oil trapper for an internal combustion engine in which an outlet pipe 20 is arranged so as to extend outside is known. The oil trapper has an inlet pipe 30 such that an inlet port opens in the tangential direction of the cylindrical surface of the main body 10 near the opening below the outlet pipe 20.
Is provided. An oil discharge pipe 40 is provided below the main body 10. Thus, blow-by gas is introduced from the inlet pipe 30 into the separation chamber of the main body 10, and FIG.
As shown by the arrow in FIG. 3, the swiveling motion reaches the lower end of the main body 10, where it is inverted and rises, and is discharged from the lower opening side of the outlet pipe 20 to the upper opening side. At this time, the oil mist contained in the gas introduced from the inlet pipe 30 is separated by the centrifugal force of the turning motion, and the separated oil descends along the inner wall surface of the main body 10 and the oil discharge pipe 4
0 to the outside of the main body 10.

[0005]

However, in the above-described oil trapper for an internal combustion engine, oil adhering to the inner surface above the inlet pipe 30 and being introduced into the main body 10 and oil being introduced into the main body 10 are provided. Oil contained in the gas and adhering to the inner surface at the upper axial end of the main body 10 merges, and centrifugal force acts on this oil due to the swirling motion of the gas introduced into the main body 10. As a result, a swirling flow is formed near the inner surface of the upper end of the main body 10 in the axial direction, and when the oil goes around the inner wall surface of the main body 10 and reaches the opening of the inlet pipe 30, the oil flows into the inner wall surface. Without descending along the inlet pipe 3
The gas introduced into the body 10 from zero causes the inner surface of the upper axial end of the body 10 to be deflected in the direction of the central outlet tube 20 as shown in FIG. As shown, it descends along the outer surface of the outlet pipe 20 and is discharged together with the introduced gas from the lower opening side of the outlet pipe 20 to the upper opening side. In this case, not only the effect of separating the angle is reduced, but the combustion in the internal combustion engine becomes inconvenient, but also the oil consumption increases.

Accordingly, the present invention is directed to an oil trapper for an internal combustion engine having an outlet pipe disposed above the main body and having an inlet pipe opened tangentially to the main body. Oil mist contained in the gas is not discharged from the outlet pipe together with the introduced gas along the inner surface of the upper axial end of the main body so that the oil can be reliably separated. As an issue.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a first cylindrical body having a cylindrical surface inside, defining a separation chamber, and having a central axis disposed substantially vertically. Having openings at both ends, and disposed above the first cylinder so that a lower opening is opened in the first cylinder and an upper opening is extended outside the first cylinder. A second cylindrical body that performs
In an oil trapper for an internal combustion engine having an inlet pipe having an inlet port that opens in a tangential direction of the cylindrical surface with respect to the cylindrical body, the oil trapper extends downward from the inner surface of the upper axial end of the first cylindrical body. And a guide rib extending from the vicinity of the inlet port to the inner wall surface of the first cylinder along the outer periphery of the second cylinder.

In addition, in addition to the guide rib, a guide rib of an introduction portion extending from the open end of the inlet port into the first cylindrical body in the axial direction of the inlet pipe and substantially parallel to the guide rib. May be provided.

According to the oil trapper for an internal combustion engine of the present invention, the inlet pipe is connected to the crankcase of the internal combustion engine and the opening above the second cylinder is connected to the intake system of the internal combustion engine. Connected to As a result, the blow-by gas in the crankcase is introduced tangentially into the separation chamber from the inlet pipe, and is discharged from the lower opening of the second cylinder toward the upper opening while performing a swirling motion. Is sucked into the intake system. The centrifugal force is applied to the oil mist in the blow-by gas by the turning motion at this time, the oil mist is separated along the inner wall surface of the separation chamber, and the separated oil is discharged to the outside of the first cylindrical body. In this case, oil adhering to the inner surface above the inlet pipe and introduced into the first cylinder and gas contained in the first cylinder and adhering to the inner surface at the upper axial end included in the gas introduced into the first cylinder. The oil flows along the inner surface at the upper axial end of the first cylindrical body due to the swirling flow generated near the inner surface at the upper axial end, but the oil flows toward the second cylindrical body by the guide rib. And the oil is guided toward the inner wall surface of the first cylindrical body. Thus, the oil descends along the inner wall surface of the first cylinder, and the separated oil is discharged to the outside. The first
The separated oil discharged outside the cylindrical body can be separately returned to the internal combustion engine.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an oil trapper for an internal combustion engine according to the present invention will be described below with reference to the drawings. FIGS. 1 and 2 relate to an embodiment of the present invention and show a cyclone type oil trapper having an externally mounted engine block. A main body 1 including a first cylindrical body according to the present invention has a central axis. It is arranged to be almost vertical, and above the main body 1,
An outlet pipe 2 constituting the second cylindrical body according to the present invention is connected, and an oil discharge pipe 4 is connected below the main body 1.

The main body 1 is a substantially cylindrical body, as shown in FIG.
An inner diameter below the upper inner diameter is formed to have a smaller diameter, and a tapered portion 1c is formed from above to below.
On the axial end 1a side, an outlet pipe 2 is provided on the center axis thereof, and an inlet pipe 3 is provided on the outer surface of the main body 1 so as to be tangential to the cylindrical surface inside the main body 1. The entrance port 3a is open. The opening end face of the entrance port 3a is formed in a rectangular shape as shown in FIG.

As shown in FIG. 1, the outlet pipe 2 is a cylindrical body joined to an axial end 1a of the main body 1 at an intermediate portion thereof, and a small-diameter opening 2a opens downward in the main body 1. The extension 2 e having the large-diameter opening 2 b is formed to extend above the main body 1. In the present embodiment, the upper end of the inlet port 3a is set at a position in contact with the inner surface of the axial end 1a.

The main body 1 extends downward from the inner surface of the axial end 1a of the main body 1 as shown in FIG. 1 and extends along the outer periphery of the outlet pipe 2 from near the inlet port 3a as shown in FIG. A guide rib 5 is formed to reach the inner wall surface. Furthermore,
As shown in FIG. 3, the main body 1 is opened from the open end of the inlet port 3a.
The guide rib 6 of the introduction part extending inward is formed. The guide rib 6 is formed so as to extend in the axial direction of the inlet pipe 3a and to extend substantially parallel to the guide rib 5.

On the other hand, a cylindrical oil discharge pipe 4 is arranged below the main body 1 so as to be orthogonal to the center axis thereof. That is, the side surface located above the one end 4b is connected to the lower end 1b side of the main body 1, and L
It is formed in a character shape. On the outer surface of the end of the oil discharge pipe 4 on the side of the opening 4a, for example, a connection 4c with a rubber hose (not shown) is formed.

Thus, a separation chamber SR is formed in the main body 1, and this separation chamber SR is connected via an inlet pipe 3 and an outlet pipe 2 to a crankcase (not shown) of an internal combustion engine and an intake system (not shown), respectively. ), And is configured to communicate with the outside through the oil discharge pipe 4 from the lower end 1b side.

In the oil trapper of the present embodiment having the above-described configuration, the inlet pipe 3 is connected to the crankcase, and the extension 2e of the outlet pipe 2 is connected to the intake system of the internal combustion engine. Then, blow-by gas in the crankcase is tangentially introduced into the separation chamber SR from the inlet port 3a, and makes a revolving motion in the same chamber to form the opening 2 of the outlet pipe 2.
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, and the oil mist is separated along the inner wall surface of the separation chamber SR. The separated oil discharged outside the main body 1 is returned from the oil discharge pipe 4 into an oil pan (not shown) via, for example, a rubber hose (not shown).

In this case, when the blow-by gas is introduced from the inlet port 3a, the blow-by gas flows along the inner wall surface of the main body 1, that is, the inner wall surface of the separation chamber SR, and most of the oil in the blow-by gas Adheres to the inner wall surface. Further, the separation chamber SR adheres to the inner surface above the inlet pipe 3.
And oil contained in the gas introduced into the separation chamber SR and adhering to the inner surface of the axial end 1a,
As shown by arrows in FIG. 3, the swirling flow generated near the inner surface of the axial end 1a flows along the inner surface of the axial end 1a, but the flow toward the outlet pipe 2 is blocked by the guide ribs 5 and 6. The oil is guided toward the inner wall surface of the main body 1.
For this reason, the oil descends along the inner wall surface of the main body 1, and the separated oil is discharged to the outside via the oil discharge pipe 4.

In the above-described embodiment, the main body 1, the outlet pipe 2, the inlet pipe 3, and the oil discharge pipe 4 are shown integrally, but of course, some or all of them are formed as separate bodies and joined. You may do it.

[0019]

Since the present invention is configured as described above, the following effects can be obtained. That is, in the oil trapper for an internal combustion engine of the present invention, the first pipe extends downward from the inner surface at the axial end above the first cylinder, and extends along the outer periphery of the second cylinder from the vicinity of the inlet port. Since the guide ribs extending to the inner wall surface of the cylindrical body are provided, the oil mist contained in the gas introduced from the inlet pipe into the first cylindrical body is exposed to the inner surface of the upper axial end of the first cylindrical body. Along with the gas introduced along the second
The guide gas prevents the flow of oil in the direction of the second cylinder by the guide ribs, so that the oil can be appropriately guided in the direction of the inner wall surface of the first cylinder. . Thus, the oil can be separated smoothly and reliably in the first cylinder.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an oil trapper for an internal combustion engine according to an embodiment of the present invention, which is a sectional view taken along line AA of FIG.

FIG. 2 is a side view of an oil trapper for an internal combustion engine according to one embodiment of the present invention.

FIG. 3 is a cross-sectional view of the oil trapper for an internal combustion engine according to one embodiment of the present invention, which is a cross-sectional view taken along line BB of FIG. 2;

FIG. 4 is a cross-sectional view of a general oil trapper for an internal combustion engine.

FIG. 5 is a longitudinal sectional view of a general oil trapper for an internal combustion engine.

FIG. 6 is a side view of a general oil trapper for an internal combustion engine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body (1st cylinder) SR separation chamber 2 Outlet pipe (2nd cylinder) 3 Inlet pipe 3a Inlet port 4 Oil discharge pipe 5, 6 Guide rib 10 Main body 20 Outlet pipe 30 Inlet pipe 40 Oil discharge pipe

Claims (1)

[Claims] 1. A first cylindrical body having a cylindrical surface inside to define a separation chamber, and having a central axis disposed substantially vertically, and an opening at both ends, the first cylindrical body being provided in the first cylindrical body. A second cylindrical body disposed above the first cylindrical body such that a lower opening is opened and an upper opening extends outside the first cylindrical body;
In an oil trapper for an internal combustion engine having an inlet pipe having an inlet port that opens in a tangential direction of the cylindrical surface with respect to the cylindrical body, the oil trapper extends downward from the inner surface of the upper axial end of the first cylindrical body. An oil trapper for an internal combustion engine, comprising: a guide rib extending from the vicinity of the inlet port to the inner wall surface of the first cylinder along the outer periphery of the second cylinder.