JPH0424089Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used to separate oil from blow-by gas.

[Conventional technology]

Automotive engines are equipped with blowby gas reduction devices to prevent blowby gas from diffusing into the atmosphere. (For example, Utility Model Publication No. 58-183919).

A blow-by gas return device communicates the space within the cylinder head cover with the intake passage downstream of the throttle valve via a blow-by gas passage. Because of this blow-by gas passage, blow-by gas existing in the space inside the cylinder head cover is sucked by the negative pressure generated in the intake passage, flows into the intake passage, and is returned to the engine without being diffused into the atmosphere. It can be done.

By the way, when the engine is operating, lubricating oil is circulated inside the engine. For this reason, the blow-by gas necessarily contains a large amount of oil mist. If the blow-by gas containing such oil mist flows into the intake passage, the amount of oil consumed increases. For this reason, an oil separation device is installed inside the cylinder head cover of the engine.

Conventionally, an oil separator having a structure as shown in FIG. 3 has been used. FIG. 3 is a longitudinal cross-sectional view of the cylinder head cover of the engine.

In FIG. 3, the oil separation device 1 is composed of a plurality of buffle plates 4 attached to the lower surface 3 of the cylinder head cover 2. As shown in FIG. A blow-by gas passage 5 is provided between the baffle plates 4. 6 is a blow-by gas outlet, and 7 is a blow-by gas outlet. 12 is a camshaft. Blow-by gas outlet 6
The oil mist that has entered the blowby gas passage 5 together with the blowby gas (arrow B) collides with the buff-full plate 4 while passing through the blowby gas passage 5 and falls. The fallen oil is returned to the oil pan (not shown) through an oil discharge hole (not shown). In the oil separation device 1 shown in FIG. 3, blow-by gas and oil are separated in this way, and only the blow-by gas is discharged into the intake passage of the engine.

[The problem that the idea attempts to solve]

The conventional oil separation device 1 shown in FIG. 3 has a problem in that its oil separation function is not as effective as expected, which may lead to an increase in oil consumption. This is due to the following reason.

That is, since the oil mist in the blow-by gas is very fine, its mass is extremely small. This is because some of the gas does not collide with the buff-full plate 4 and is discharged from the blow-by gas outlet 7 together with the blow-by gas.

The technical problem of the present invention is to solve the problems of the conventional technology.

In other words, the technical problem of the present invention is to improve the oil separation function in an oil separation device for blow-by gas, and to prevent an increase in oil consumption due to the blow-by gas taking away the oil.

[Means to solve the problem]

In order to achieve this technical problem, the following measures are taken in the present invention.

That is, the oil separation device for blow-by gas according to the present invention includes a camshaft rotatably assembled to the cylinder head of an engine, a fan fixed to the camshaft and blowing air in the axial direction of the camshaft, and a blow-by gas side on the blow-by side of the fan. It is characterized by having a collision wall arranged opposite to the fan at a predetermined distance, and a blow-by gas outlet provided in the cylinder head cover on the side opposite to the blowing side of the fan.

[Effect]

When the engine is running, the camshaft rotates and the fan also rotates. As the fan rotates, the blow-by gas is blown off at high speed in the axial direction of the camshaft, and collides with a collision wall that is placed opposite the fan at a predetermined distance. When blow-by gas collides with the collision wall, the blow-by gas itself is a gas, so it suddenly changes its direction of travel, but oil mist has mass even if it is small, and its speed is high, so its inertial mass becomes large. ing. Therefore, only the oil mist collides with and adheres to the collision wall. In this way, most of the oil mist is separated from the blow-by gas. Since the blow-by gas outlet is provided on the cylinder head cover on the side opposite to the blowing side of the fan, it is possible to allow only the blow-by gas from which most of the oil mist has been separated to flow in.

Therefore, according to the present invention, it is possible to prevent an increase in oil consumption due to blow-by gas taking away oil.

The structure (means and effect) of the present invention will be made clearer from the following examples.

〔Example〕

FIG. 1 is a longitudinal sectional view of a blow-by gas oil separation device 1 according to an embodiment of the present invention.

In FIG. 1, 11 is a cylinder head, and 2 is a cylinder head cover. A plurality of buffle plates 4 are attached to the lower surface 3 of the cylinder head cover 2. A blow-by gas passage 5 is provided between the baffle plates 4. A large number of small holes 9 are bored in the baffle plate 4. 6 is a blow-by gas outlet; 7
is the blow-by gas outlet.

In FIG. 1, 12 is a camshaft.
13 is a journal part, and 14 is a cam. The camshaft 12 is an engine intake and exhaust valve (not shown)
It is for driving. The engine shown in FIG. 1 has a camshaft 12 housed in the cylinder head 11, so it is an overhead camshaft type engine.

A fan 15 is installed approximately in the center of the camshaft 12.
is installed. The fan 15 is configured to send air in the direction of arrow C when the camshaft 12 rotates in the direction of arrow A. Needless to say, most of this wind is blow-by gas. Juan 15
is fixed to the camshaft 12 by press-fitting or the like. A front wall 21 of the cylinder head cover 2 is located on the blowing side of the fan 15 (in the direction of arrow C), and this front wall 21 is used as a collision wall.

As can be seen from FIG. 1, the blow-by gas outlet 6 is located in the blowing direction of the fan 15 (direction of arrow C).
It is arranged on the opposite side, that is, on the suction side 22.

FIG. 2 is a cross-sectional view of FIG. 1. Second
In the figure, 11 is a cylinder head, 2 is a cylinder head cover, 6 is a blow-by gas outlet, and 7 is a blow-by gas outlet. Second
As shown in the figure, blow-by gas outlet 6
is also opened in a direction perpendicular to the axis of the cylinder head cover 1.

The operation of this embodiment will be explained.

During engine operation, the camshaft 12 rotates in the direction of arrow A in FIG.
creates a flow of blow-by gas in the direction of arrow C. The rotational speed of the camshaft 12 is half the rotational speed of the engine, so it is quite high speed. Therefore, the blow-by gas wind generated by the fan 15 is very strong. Therefore, the oil mist in the blow-by gas is blown away at high speed in the direction of arrow C along with the blow-by gas. The front wall 21 of the cylinder head cover 2 is located in the direction of arrow C of the fan 15, but since the blow-by gas itself is a gas, the blow-by gas itself rapidly changes its traveling direction at the front wall 21. On the other hand, oil mist has mass even though it is small, and its inertial mass is large due to its high speed. Therefore, only the oil mist collides with and adheres to the front wall 21 of the cylinder head cover 2. In this way, the oil mist is separated from the blow-by gas.

The blow-by gas from which most of the oil mist has been separated flows back along the side wall 23 of the cylinder head cover 1 (see FIG. 2) in the direction of arrow D and enters the blow-by gas outlet 6. Since the oil mist remaining in the blowby gas is further separated by the baffle plate 4, the blowby gas contains almost no oil mist by the time it exits from the blowby gas outlet 7.

Thus, according to the present embodiment, it is possible to prevent an increase in oil consumption due to blow-by gas taking away oil.

In this embodiment, as shown in FIG. 2, the blow-by gas outlet 6 is also provided in the direction perpendicular to the axis of the cylinder head cover 2, that is, in the direction of the side wall 23 of the cylinder head cover 2. Because of this, the blow-by gas (first
The blow-by gas can easily flow into the blow-by gas outlet 6 through the arrow D) in the figure.

Further, as described above, the blow-by gas outlet 6 is arranged on the suction side 22 of the fan 15 for the following reason.

That is, the blow-by gas outlet 6 is connected to the fan 1.
If it is provided on the ventilation side (discharge side) 24 of 5,
This is because there is a possibility that blow-by gas before the oil mist is separated may flow in, and in this case, the provision of the fan 15 becomes meaningless.

Note that in this embodiment, the oil itself and the engine valve mechanism such as the intake and exhaust valves are cooled by the wind generated by the fan 15.
In this example, the life of the oil is extended, and
Another advantage is that thermal deterioration of the valve mechanism is prevented.

[Effect of idea]

As can be seen from the description of the above embodiments, the present invention has the effect of preventing an increase in oil consumption due to blow-by gas taking away oil.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of a blow-by gas oil separation device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken from the side shown in FIG. 1, and FIG. 3 is a conventional blow-by gas oil separation device. FIG. 1...Oil separation device (oil separation device for blow-by gas), 2...Cylinder head cover, 6
...Blow-by gas outlet, 11...Cylinder head, 12...Camshaft, 15...Fan.

Claims (1)

[Scope of utility model registration request] A camshaft rotatably assembled to the cylinder head of an engine, a fan fixed to the camshaft that blows air in the axial direction of the camshaft, and a collision that is placed opposite the fan at a predetermined distance on the blowing side of the fan. A blow-by gas oil separation device comprising: a wall; and a blow-by gas outlet provided in a cylinder head cover on a side opposite to the blowing side of the fan.