JPH0441212Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention relates to an improvement of a lubricating oil separation chamber constituting a blow-by gas recirculation device for an internal combustion engine.

(Prior Art and its Problems) Conventionally, as a lubricating oil separation chamber structure constituting a blow-by gas recirculation device for an internal combustion engine, there is a structure as shown in FIG. 2, for example.

In FIG. 2, inside a cylinder head cover 2 covered by a cylinder head 1, a plate 3 installed horizontally and a partition wall 4 erected at the center of the plate 3 are installed. Between the plate 3, the partition wall 4, and the wall surface of the cylinder head 2, two first lubricating oil separation chambers _S1 and a second lubricating oil separation chamber _S2 are formed. room
A connector 5 is connected to the top surface of S ₁ , and this connector 5 is communicated with an air cleaner or an outside air introduction pipe. Also, the second lubricating oil separation chamber S ₂
A connector 6 is provided on the top surface of the intake manifold, and the connector 6 communicates with the intake manifold.
The plate 3 also has an opening 3a that communicates the first lubricating oil separation chamber _S1 with the inside of the cylinder head 1.
and an opening 3b that communicates the second lubricating oil separation chamber _S2 with the inside of the cylinder head 1.

Therefore, the blow-by gas _G1 introduced from the cylinder head 1 to the cylinder head cover 2 is
The first lubricating oil separation chamber passes through the opening 3a of the plate 3.
The air is introduced into _S1 , sucked through the connector 5, and returned to the air cleaner or outside air introduction pipe.
Similarly, the blow-by gas G2 introduced into the second lubricating oil separation chamber _S2 through the opening 3b through the cylinder head cover ₂ is sucked through the connector 6 and circulated to the intake manifold. That is, since the connector 5 is communicated with the outside air through the outside air introduction pipe, etc., the blow-by gas G ₁ is generated by the outside air pressure.
On the other hand, since the connector 6 is connected to the intake manifold, the blow-by gas G ₂ is sucked by the negative pressure generated within the engine.

In such a conventional lubricating oil separation chamber structure, the first lubricating oil separating chamber S ₁ and the second lubricating oil separating chamber S ₂ in the cylinder head cover 2 are completely partitioned by the partition wall 4. When the lubricating oil level in the cylinder head 1 is tilted during turning or sudden acceleration/deceleration, etc., the opening 3a or the opening 3
Since the lubricating oil blocks b, there is a problem that the lubricating oil is sucked into the intake manifold, air cleaner, etc. through the connector 5 or 6 along with the blow-by gas.

(Means for Solving the Problems) The present invention has been devised in view of the above-mentioned conventional problems, and is designed to improve the lubricating oil in the blow-by gas in the lubricating oil separation chamber that constitutes the blow-by gas circulation device. The purpose is to provide a lubricating oil separation chamber structure capable of removing lubricating oil and reducing lubricating oil carried away by blow-by gas. A separation chamber and a second lubricating oil separation chamber are provided and these are separated from each other by a partition wall,
An internal combustion engine configured to connect an engine intake manifold and an outside air introduction pipe to the first lubricating oil separation chamber and the second lubricating oil separation chamber, respectively, so that blow-by gas is circulated through these,
The partition wall is provided with a door that normally remains closed, but can be opened by a moment in the centrifugal direction or acceleration/deceleration direction that occurs when the automobile turns or accelerates/decelerates, and the opening operation of the door causes the first lubrication The outside air is introduced into the oil separation chamber and the second lubricating oil separation chamber from the outside air introduction pipe by negative pressure from the intake manifold.

(Function) A door is provided on the partition wall that partitions the first lubricating oil separation chamber and the second lubricating oil separation chamber in the cylinder head cover, and this door protects the cylinder from centrifugal or acceleration generated when the vehicle turns or accelerates or decelerates. Since the structure is such that it opens due to a moment in the deceleration direction,
For example, when a door is opened by a centrifugal moment generated when a car turns, the first lubricant separation chamber and the second lubricant separation chamber are brought into communication with each other when the car turns, and at this time, the first lubricant separation chamber It is connected to the engine intake manifold, and the second
Since the lubricating oil separation chamber is communicated with the outside air,
Outside air is introduced from the lubricating oil separation chamber, and the introduced outside air flows into the first lubricating oil separation chamber under negative pressure.
By the outside air flowing into the first lubricating oil separation chamber and the second lubricating oil separation chamber, lubricating oil with a higher specific gravity than the outside air is removed from the blow-by gas, reducing the lubricating oil carried away by the blow-by gas, and the intake system This prevents lubricating oil from flowing into the interior.

As an example of the configuration of the present invention, for example, doors that open and close in opposite directions are installed on the partition wall that partitions the lubricating oil separation chamber, and one door can be opened and closed only toward the first lubricating oil separation chamber. By making the other door open and closing only to the second lubricating oil separation chamber side, these two doors are usually in contact with the partition wall and the first lubricating oil separation chamber and the second lubricating oil separation chamber are separated. The door is completely partitioned to properly regulate the flow of blow-by gas, and when a car turns, etc., the door on the side where centrifugal force, etc. is applied is opened by the moment due to centrifugal force, etc.
When the first lubricating oil separation chamber and the second lubricating oil separation chamber are communicated with each other, and when a centrifugal force or an acceleration force such as acceleration/deceleration in the opposite direction occurs, the door on the other side is opened by the moment in the same direction, and the second lubricating oil separation chamber is opened. The lubricating oil separation chamber and the second lubricating oil separation chamber are communicated with each other, so that the door on one side can be opened and closed smoothly when the vehicle turns or when the car suddenly accelerates or decelerates, and the first lubricating oil separation chamber and the second lubricating oil separation chamber are connected to each other. Since outside air is introduced, the lubricating oil in the blow-by gas can be effectively separated when the automobile turns.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows a perspective view of the partition wall 4 that partitions the lubricating oil separation chamber in FIG.
The upper edge of the partition wall 4 is supported by a butterfly plate 9 so that it can be opened and closed, and can be opened and closed only on the side of the first lubricating oil separation chamber _S1 in FIG.
The S ₂ side has a structure that cannot be opened or closed, and the door 7 is normally closed by the biasing force of a spring 11 fixed to the butterfly plate 9.
is in contact with the partition wall 4, and the opening 4a formed in the partition wall 4 is kept closed. A weight 13 is fixed to the lower end of the door 7, and when a centrifugal force or the like is applied, the weight 13 generates a moment in the direction of the centrifugal force, causing the door 7 to open around the hinge 9. At that time, the urging force of the spring 11 is overcome and the door 7 is moved to the first position.
The lubricating oil separation chamber can be opened to the _S1 side. On the other hand, the upper edge of the door 8 is similarly supported by a butterfly plate 10, and a spring 12 is fixed to the butterfly plate 10. Normally, the door 8 is brought into contact with the partition wall 4 by the biasing force of the spring 12. The opening 4b formed in the partition wall 4 is kept closed. This door 8 can be opened and closed only to the second lubricating oil separation chamber S2 side in FIG. ₂ , and cannot be opened and closed to the first lubricating oil separation chamber _S1 side. A weight 14 is also fixed to the lower end of the door 8.

In this example, since the doors 7 and 8 that open and close only in opposite directions are provided on the partition wall 4, the doors 7 and 8 are normally closed by the urging force of the springs 11 and 12. Blow-by gas G1 is raised from the cylinder head 1 into the cylinder head cover 2, passes through the openings 3a and 3b, and is introduced into the first lubricating oil separation chamber _S1 and the blow-by gas _G1 is introduced into the second lubricating oil separation chamber _S2 . Gas G ₂ is sucked through connector 5 and connector 6 and circulated.

When the car turns, the oil level of the lubricating oil in the cylinder head 1 tilts due to the centrifugal force that accompanies the turning.
For example, when the opening 3b on the side of the lubricating oil separation chamber _S2 is blocked, conventionally the lubricating oil is sucked into the intake manifold side from the connector 6 together with the blow-by gas _G2 , but in this example, when turning Due to the moment in the same direction caused by the centrifugal force, the weight 14 moves toward the second lubricating oil separation chamber _S2 and the door 8 is opened, so that the opening 4b of the partition wall 4 is opened and the first lubricating oil separating chamber _S1 and the second lubricating oil separation chamber S2 are opened. Lubricating oil separation chamber S ₂ is in communication state, and blow-by gas in each lubricating oil separation chamber S ₁ and S ₂ is released.
G ₁ and G ₂ are mixed into the second lubricating oil separation chamber.
Since S ₂ is communicated with the intake manifold via the connector 6, the suction negative pressure on the intake manifold side causes the lubricating oil to flow into the first lubricating oil separation chamber S ₁ via the connector 5, which is communicated with the outside air via the outside air introduction pipe, etc. Outside air E is introduced, and the introduced outside air E is sucked from the first lubricating oil separation chamber S ₁ to the second lubricating oil separation chamber S ₂ . Therefore, by introducing the outside air E into the second lubricating oil separation chamber _S2 , the lubricating oil contained in the blow-by gas _G2 in the second lubricating oil separation chamber _S2 has a higher specific gravity than the outside air E. , with the introduction of outside air E, blow-by gas
The lubricating oil is separated from G ₂ and sinks downward, and the lubricating oil is not sucked into the connector 6, thereby reducing the lubricating oil carried away to the intake manifold side by the blow-by gas G ₂ . When the automobile completes its turn and returns to its normal running state, the door 8 is brought into contact with the partition wall 4 by the biasing force of the spring 12, so that the opening 4 is closed.
b is closed and the normal blow-by gas reflux state is restored. On the other hand, when the vehicle turns in the opposite direction, the door 8 remains closed and the door 7 opens toward the first lubricating oil separation chamber _S1 via the weight 13, and similarly, the door 7 opens toward the first lubricating oil separation chamber S1. ₁ and the second lubricating oil separation chamber _S2 are communicated with each other, and outside air E is introduced into the first lubricating oil separation chamber _S1 under the negative pressure of the second lubricating oil separation chamber _S2 , and the introduced outside air The lubricating oil in the blow-by gas is well separated by E.

In addition, if the doors 7 and 8 of this example are installed so that they can be opened and closed in the direction of the acceleration force that occurs when the car suddenly accelerates or decelerates, the lubricating oil level in the cylinder head 1 will be prevented from tilting when the car suddenly accelerates or decelerates. In some cases, the same effect as described above can be achieved, and the removal of lubricating oil due to blow-by gas can be effectively reduced.

In addition, in this example, the cylinder head cover 2
Although one example is provided in which one first lubricating oil separation chamber S ₁ and one second lubricating oil separation chamber S ₂ are provided in the interior, it is also possible to provide a plurality of lubricating oil separation chambers S ₁ and S ₂ respectively. The same effect can be obtained by similarly installing the doors 7 and 8 of this example on the partition wall that partitions each lubricating oil separation chamber. Furthermore, the number of doors 7 and 8 is not particularly limited to that of this example, and the number and shape may be changed as appropriate depending on the capacity of the engine and the like.

(Effect of the invention) The lubricating oil separation chamber structure of the present invention includes a first lubricating oil separation chamber and a second lubricating oil separation chamber into which blow-by gas is introduced from the cylinder head in the cylinder head cover, and these are separated from each other by partition walls. In an internal combustion engine configured such that an intake manifold and an outside air introduction pipe of the engine are respectively connected to the first lubricating oil separation chamber and the second lubricating oil separation chamber so that blow-by gas is circulated through these, the partition wall A door is provided that normally remains closed, but can be opened by the moment in the centrifugal direction or acceleration/deceleration direction that occurs when the vehicle turns or accelerates/decelerates, and the opening of the door causes the first lubricating oil to separate. By configuring the structure in which outside air is introduced into the chamber and the second lubricating oil separation chamber from the outside air introduction pipe by negative pressure from the intake manifold,
Outside air is introduced into the lubricating oil separation chamber through the door when the car turns, etc., and the lubricating oil in the blow-by gas is effectively separated by the outside air, effectively reducing lubricating oil carried away by the blow-by gas. have

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, and is a perspective view of a partition wall provided in a lubricating oil separation chamber, and FIG. 2 is an overall structural diagram of a conventional lubricating oil separation chamber. 1... Cylinder head, 2... Cylinder head cover, 3... Plate, 3a, 3b... Opening, 4... Partition wall, 4a, 4b... Opening, 5, 6
...Connector, 7, 8...Door, 11,12...
Spring, 9, 10... butterfly plate, 13, 14... weight,
_S1 ...First lubricating oil separation chamber, _S2 ...Second lubricating oil separation chamber, _G1 , _G2 ...Blow-by gas, E...Outside air.

Claims (1)

[Claims for Utility Model Registration] (1) A first lubricating oil separation chamber and a second lubricating oil separation chamber into which blow-by gas is introduced from the cylinder head are provided in the cylinder head cover, and these are separated from each other by a partition wall. In an internal combustion engine configured such that an engine intake manifold and an outside air introduction pipe are connected to the first lubricating oil separation chamber and the second lubricating oil separation chamber, respectively, so that blow-by gas is recirculated through these, the partition wall usually has a A door is provided that remains closed but can be opened by a moment in the centrifugal direction or acceleration/deceleration direction that occurs when the vehicle turns or accelerates/decelerates, and the opening operation of the door causes the first lubricating oil separation chamber and the second lubricating oil separation chamber to open. A lubricating oil separation chamber structure for an internal combustion engine blow-by gas recirculation system, characterized in that outside air is introduced into the lubricating oil separation chamber from the outside air introduction pipe by negative pressure from the intake manifold. (2) The door provided on the partition wall includes a first door that can be opened and closed only to the first lubricating oil separation chamber side and a second door that can be opened and closed only to the second lubricating oil separation chamber side. A lubricating oil separation chamber structure for an internal combustion engine blow-by gas recirculation device as claimed in claim 1.