JP2975291B2 - 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 is, for example, a shield system that connects the crankcase and the air cleaner with a hose and a PCV (Posittive Crankcase Vent).
ilation: Forced ventilation of the crankcase), a PCV system that communicates the crankcase with the intake system via a valve and forcibly ventilates the crankcase while controlling the flow rate of blow-by gas by 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 separation 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. 5) mounted on the outside of an engine block and a built-in oil trapper 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. 5, in which blow-by gas is introduced from an inlet port IP into a cyclone chamber (centrifugal separation chamber) CC, and performs a swirling motion from a central outlet passage OP via a hose HC. And discharged outside the room, and is sucked into the intake system for 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, there is a blind spot D in the connecting portion between one open end of the cyclone chamber CC and the hose, and the oil stays in D because the oil is viscous and the oil is smooth. A phenomenon that the oil does not flow into the oil reservoir occurs.

Therefore, the present invention prevents the accumulation of oil,
It is an object of the present invention to provide an oil and a wrapper for an internal combustion engine having a simple structure that is advantageous in terms of cost, such that oil can be smoothly supplied from a cyclone body to an oil reservoir and a general-purpose hose can be used as it is.

[0007]

In order to achieve the above object, a separation chamber having a cylindrical surface inside is defined, and a tapered portion is formed on one side so that the inner diameter increases as approaching the tip. A first cylindrical body having an opening, and an opening at both ends such that one opening is opened in the first cylindrical body and the other opening is opened outside the first cylindrical body. An internal combustion engine comprising: a second cylindrical body to be arranged; and an inlet pipe having an inlet port formed in the first cylindrical body so as to open in a tangential direction of a cylindrical surface near one opening of the second cylindrical body. Oil trapper.

[0008] In the oil trapper for an internal combustion engine of the present invention, since the opening end on one side of the first cylinder is tapered, a dead angle formed between the opening end and the hose is reduced. Less. As a result, the oil separated from the blow-by gas in the separation chamber is smoothly returned to the oil storage chamber.

[0009]

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 show an oil trapper of an engine block external type according to an embodiment of the present invention.
As shown in (2), for example, two parts made of synthetic resin are combined. That is, the main body 1 including the first cylindrical body according to the present invention.
And the outlet pipe 2 including the second tubular body according to the present invention, and both are joined in a state where a part of the outlet pipe 2 extends into the main body 1.

The main body 1 is a substantially cylindrical body, one opening end of which has a small diameter serving as an outlet 1a, and the other opening end 1b of which has a large diameter. The outlet 1a is formed with a taper 1g such that the inner diameter increases toward the tip. The tapered portion 1 is also provided between one open end 1a and the other open end 1b.
c is formed. The opening end 1b of the main body 1 extends in the radial direction and is formed with a flange portion 1f. Open end 1
On the b side, an inlet pipe 5 is formed integrally with the main body,
An inlet port 5a is open in the tangential direction of the inner cylindrical surface of the main body 1.

On the other hand, the outlet pipe 2, as shown in FIG. 2, is a cylindrical body having a flange 3 integrally formed at an intermediate portion. Collar 3
Has a flange portion 3f, which is tightly joined to the flange portion 1f of the main body 1. Outlet pipe 2 as shown in FIG.
Inside, a cylindrical portion 2c having an inner diameter larger than the inner diameter of the open end 2b and the first and second tapered portions 2 opened at the open end 2a side.
d, 2e are formed, and the enlarged inner diameter portion 12 is formed by these.

When the outlet pipe 2 is joined to the main body 1, a separation chamber 11 is formed on the discharge port 1a side in the main body 1,
The separation chamber 11 is connected to a crankcase (not shown) and an intake system (not shown) of the internal combustion engine through an inlet pipe 5 and an outlet pipe 2, respectively, and is connected to an external oil reservoir (through an outlet 1a). (Not shown). In this embodiment, hoses 13, 14, 15 are connected to the inlet pipe 5, the outlet pipe 2, and the outlet 1a, respectively.

In the oil trapper of this embodiment having the above-described structure, the inlet pipe 5 is connected to the crankcase (not shown) of the internal combustion engine via the hose 14, and the outlet pipe 2
Is connected to an intake system (not shown) of the internal combustion engine through a hose 13. Then, blow-by gas in the crankcase flows from the inlet port 5a to the separation chamber 11.
Is tangentially introduced into the inside of the outlet pipe 2 and makes a revolving motion within the same chamber from the open end 2a of the outlet pipe 2 to the open end 2 through the inner diameter portion 2f.
and is sucked into the intake system of the internal combustion engine. At this time, the centrifugal force is applied to the oil mist in the blow-by gas by the swirling motion, and the oil mist is separated along the inner wall surface of the separation chamber 11. (Not shown).

In this case, since the discharge port 1a is formed with a taper 1g so that the inner diameter increases toward the tip, the joint between the discharge port 1a and the hose 15 is
There is almost no blind spot. Therefore, the oil separated in the separation chamber 11 is smoothly guided to the oil storage chamber without the oil remaining at the joint between the outlet 1a and the hose 14.

[0015]

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 is formed such that a taper is formed so that the inner diameter increases toward the tip of the outlet opening to one side of the first cylindrical body. Since almost no blind spot in which the oil stays occurs, the oil can be smoothly guided from the separation chamber to the oil storage chamber. Also,
Since there is no need to provide a special structure and equipment such as a general-purpose hose that can be used as it is, a cost-effective and simple structure can be obtained.

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

FIG. 3 is a schematic configuration diagram of a conventional cyclone type oil trapper.

FIG. 4 is a partial longitudinal sectional view showing a connection structure between a discharge port of a conventional cyclone type oil trapper and a hose.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body (1st cylinder) 1a Discharge port 1g Taper part 2 Outlet pipe (2nd cylinder) 5 Inlet pipe 11 Separation chamber

Claims (1)

(57) [Claims] A first cylindrical body having a cylindrical surface on an inner side thereof, defining a separation chamber, and having, on one side, an opening formed with a tapered portion so that the inner diameter increases toward the tip end; A second cylindrical body having openings at both ends and arranged such that one opening is opened in the first cylindrical body and the other opening is opened outside the first cylindrical body; An oil trapper for an internal combustion engine, comprising: an inlet pipe having an inlet port formed in the first cylindrical body so as to open in a tangential direction of a cylindrical surface near one opening of the cylindrical body.