JPH0614008Y2 - Oil separation device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an oil separation device for an internal combustion engine having an efficient oil separation function.

(Prior Art) Conventional means for separating the oil content in blow-by gas and dropping it into the cylinder head tries to increase the capacity inside the cylinder head cover as much as possible to improve the oil shortage performance. There is a limit to the volume increase,
The sufficient oil separation function was not obtained.

On the other hand, in the one disclosed in Japanese Utility Model Publication No. 49-136933, cooling water of a water jacket in a cylinder block is used for cooling blow-by gas, and blow-by gas is made to flow in a pipe with cooling fins so that cooling fins are attached. It is designed to collect the oil condensed by the cold air in the pipe, which brings about a large change in the water jacket and an increase in cooling water.

Further, the one disclosed in Japanese Utility Model Laid-Open No. 57-22612 is a type in which separated oil is returned to an oil pan through an oil pipe, and air and oil coexist in a cooling chamber and the separated oil is cooled. It is attracted by the air passing through the chamber, the separation effect cannot be achieved, and the oil leakage is not reliable.

(Problems to be solved by the invention) There is a limit to increasing the internal volume of the cylinder head cover, and it is disadvantageous to drastically change the water jacket in the cylinder block and use a large amount of cooling water. The contact between air and oil in the head cover has a problem that the oil is taken away.

(Means for Solving Problems) The present invention provides a relatively large volume oil separation chamber defined by a baffle plate in a cylinder head cover, and passes through a conduit with cooling fins arranged in this oil separation chamber. An oil mist or the like in blow-by gas is condensed by air through a cooling fin so as to be dropped and separated, and an oil separation chamber is provided in a cylinder head cover by a baffle plate having a gas introduction port and an oil dropping port. A gas inlet is provided on the upper wall of the oil separation chamber, and a conduit with cooling fins is connected in the oil separation chamber, one end of which communicates with the secondary side of the air cleaner and the other end of which communicates with the intake passage of the engine. An oil separation device for an internal combustion engine is provided.

(Function) When flowing into the oil separation chamber in the cylinder head cover from the gas inlet of the baffle plate, the flow velocity of the blow-by gas suddenly decreases, and the relatively heavy oil droplets in the blow-by gas fall off due to gravity. The air passing through the conduit with the cooling fins allows the oil mist and the like in the blow-by gas to be condensed and separated via the cooling fins.

(Embodiment) An embodiment of the present invention will be described with reference to the drawings.

An oil separation device 1 for an internal combustion engine has an oil separation chamber 5 defined by a baffle plate 4 on an upper inner side of a cylinder head cover 3 mounted on a cylinder head 2.
The baffle plate 4 is provided with a gas introducing port 6 and an oil dropping port 7, and the gas introducing port 6 is larger than the oil dropping port 7 which serves as an oil drain dropping hole.

A conduit 8 with cooling fins is arranged in the oil separation chamber 5, and the conduit 8 with cooling fins is provided on the outer periphery with a cooling fin portion 8a.
And one end communicates with the secondary side of the air cleaner 10 via the connecting pipe 9, and the other end communicates with the intake passage 11 of the engine and the connecting pipe 1.
It communicates via 2.

The gas passage 13 provided on the upper wall of the oil separation chamber 5 has a connecting pipe 1
4 to communicate with the intake passage 11 through the inflow port 15, the gas introduction port 6 and the oil drop port 7 communicate with the cylinder head lower chamber 16 partitioned by the baffle plate 4, and the cylinder head lower chamber 16 is driven by a valve. A mechanism 17 is provided.

In the figure, 18 is an oil drop hole of the cylinder head 2.

Since the present invention is constructed as described above, the cylinder head cover 3 passes through the oil drop hole 18 from the crankcase.
The blow-by gas (a) that has flowed in enters the oil separation chamber 5 through the gas introduction port 6 of the baffle plate 4.

At this time, since the blow-by gas (a) suddenly enters the large-capacity oil separation chamber 5 through the gas introduction port 6, the flow velocity rapidly decreases,
The relatively heavy oil droplet (b) in the blow-by gas (a) is separated and dropped by gravity and returns to the inside of the cylinder head 2 through the oil drop port 7 of the baffle plate 4.

Next, the relatively light oil droplets and oil mist in the blow-by gas (a) come into contact with the cooling fin-equipped conduit 8 and are cooled by the air (c) having a relatively low temperature from the air cleaner 10. By blow-by gas (a)
The oil content is condensed and separated.

In this way, the oil droplets (d) that have been condensed and separated and adhered to the cooling fin portion 8a are combined with other oil droplets, and due to the increase, they are successively dropped on the baffle plate 4 by their own weight,
Eventually, the oil falls into the cylinder head 2 through the oil drop port 7.

(Effect of the Invention) The present invention provides a cooling fin conduit in a relatively large-volume oil separation chamber defined by a baffle plate having a gas introduction port and an oil dropping port, and prevents blow-by gas that is hot during engine operation. Since it is possible to condense and separate the oil while cooling, the oil cut-off capability is greatly improved, and it has a volumetric oil separation mechanism, which is highly efficient, and requires no cylinder block changes, extra cooling water, and air and oil. Improves oil leakage reliability without contact with mist.

[Brief description of drawings]

The drawing is a sectional view of the essential part of the device of the present invention. 1 ... Oil separation device for internal combustion engine of the present invention, 2 ... Cylinder head, 3 ... Cylinder head cover, 4 ... Baffle plate, 5 ... Oil separation chamber, 6 ... Gas inlet,
7 ... Oil drop port, 8 ... Conduit with cooling fin, 8a ... Cooling fin section, 10 ... Air cleaner, 11 ... Intake passage.

Claims (1)

[Scope of utility model registration request] 1. A baffle plate having a gas introduction port and an oil drop port defines an oil separation chamber in a cylinder head cover, and a gas passage port is provided on the upper wall of the oil separation chamber. An oil separation device for an internal combustion engine in which a conduit with a cooling fin, which communicates with the next side and communicates the other end with an intake passage of the engine, is arranged in the oil separation chamber.