JPH0988540A - Oil trapper for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil trapper for an internal combustion engine, whose structure is simple so that a cost may not be increased, and in which oil separated in a separation chamber is introduced into an oil sump without remaining on the way thereto. SOLUTION: In a main body 1 which has a cylindrical surface in its inside and surrounds a separation chamber 11, an outlet pipe 2 is arranged so that one opening end thereof is opened as an exhaust port 1a and the other opening end thereof is opened to the outside of the main body 1, an inlet pipe 5 is arranged so that an inlet port part 5a is opened in the direction of the tangent of the cylindrical surface in the vicinity of the exhaust port 1a, and the exhaust port 1a, the outlet pipe 2 and the inlet pipe 5 are connected to each other by hoses 15, 13, 14. A taper 1g is formed so that the inside diameter of the inner wall surface of the exhaust port 1a becomes larger as it approaches to its tip end.

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 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 a crankcase and an air cleaner with a hose and a PCV (Posittive Crankcase Vent).
ilation: That is, forced ventilation of the crankcase), which is roughly classified into a PCV system in which the crankcase and the intake system are communicated with each other via a valve, and the blowby gas is controlled by the negative pressure of the intake while the crankcase is forcibly ventilated. .

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. 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, but an external oil trapper (shown in FIG. 5) mounted on the outside of the engine block and a built-in 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. 5, in which blow-by gas is introduced from the inlet port IP into the cyclone chamber (centrifugal chamber) CC, and while making a swirling motion, it passes through the hose HC from the outlet passage OP in the central portion. Are discharged to the outside of the room and 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 during the swirling motion, and is collected in the oil reservoir chamber along the wall surface of the cyclone chamber CC.

[0005]

However, there is a dead area D at the connecting portion between the one end of the cyclone chamber CC and the hose, and the oil is viscous and stays at D, so that the oil is smooth. The phenomenon that the oil does not flow into the oil reservoir occurs.

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

[0007]

In order to achieve the above object, a tapered portion is formed so as to have a cylindrical surface on the inside to define a separation chamber and to increase the inner diameter toward one end toward the tip. A first cylinder having an opening and an opening at each end so that one opening is open in the first cylinder and the other opening is open outside the first cylinder. An internal combustion engine including a second tubular body to be arranged and an inlet pipe in which an inlet port is formed in the first tubular body so as to open in a tangential direction of a cylindrical surface near one opening of the second tubular body. It was used as an oil trapper.

Thus, in the oil trapper for an internal combustion engine of the present invention, since the taper is formed at the opening end on one side of the first cylindrical body, there is a blind spot formed between the opening end and the hose. 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 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 and 2 relate to an embodiment of the present invention and show an oil trapper of an external engine block type.
As shown in, 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 cylindrical body according to the present invention, and the two 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, and one opening end has a small diameter and serves as a discharge port 1a, and the other opening end 1b has a large diameter. The discharge port 1a is formed with a taper 1g so that the inner diameter increases toward the tip. Further, the taper portion 1 is also provided between the one opening end 1a and the other opening end 1b.
c is formed. The opening end 1b of the main body 1 is formed with a flange portion 1f extending in the radial direction. Also, the open end 1
The inlet pipe 5 is formed integrally with the main body on the b side,
The inlet port 5a opens in the tangential direction of the inner cylindrical surface of the main body 1.

On the other hand, as shown in FIG. 2, the outlet pipe 2 is a cylindrical body integrally formed with a collar portion 3 at an intermediate portion. Collar 3
Has a flange portion 3f, which is in close contact with and joined to the flange portion 1f of the main body 1. As shown in FIG. 1, the outlet pipe 2
Inside, a cylindrical portion 2c having an inner diameter larger than the inner diameter of the opening end 2b and opened on the side of the opening end 2a, and the first and second tapered portions 2
d and 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 inside the main body 1 on the side of the outlet 1a,
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 storage chamber ( (Not shown). In this embodiment, hoses 13, 14 and 15 are connected to the inlet pipe 5, the outlet pipe 2 and the discharge port 1a, respectively.

In the oil trapper of the present embodiment having the above-mentioned 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
The open end 2b side is connected to an intake system (not shown) of the internal combustion engine through a hose 13. Then, the blow-by gas in the crankcase is separated from the inlet port 5a into the separation chamber 11
Is introduced in a tangential direction into the inside of the chamber, and the swirling motion is performed in the same chamber.
and is sucked into the intake system of the internal combustion engine. A 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 11, and the separated oil is discharged downward from the discharge port 1a and the oil reservoir chamber via the hose 15. (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 discharge port 1a and the hose 14.

[0015]

Since the present invention is configured as described above, it has the following effects. That is, in the oil trapper for an internal combustion engine of the present invention, a taper is formed in the discharge port that is opened in one of the first cylinders so that the inner diameter increases toward the tip. Since there is almost no blind spot where the oil stays, the oil can be smoothly guided from the separation chamber to the oil reservoir. Also,
Since a general-purpose hose can be used as it is without providing a special structure and equipment, a cost-effective and simple structure can be adopted.

[Brief description of drawings]

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

FIG. 2 is an exploded perspective view of an oil trapper for an internal combustion engine according to an embodiment of the present invention.

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

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

[Explanation of symbols]

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

Claims (1)

[Claims] 1. A first tubular body having a cylindrical surface on the inner side to define a separation chamber, and an opening having a tapered portion formed on one side so that the inner diameter increases toward the tip. A second tubular body having openings at both ends and arranged so that one opening is opened in the first tubular body and the other opening is opened outside the first tubular body; An oil trapper for an internal combustion engine, comprising: an inlet pipe having an inlet port formed in the first cylinder so as to open in a tangential direction of a cylindrical surface near one opening of the cylinder.