JP3444142B2 - Gas-liquid separator for blow-by gas - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a gas-liquid separator for blow-by gas.

[0002]

2. Description of the Related Art First, an outline of blow-by gas will be described. A mixture of air and fuel in the combustion chamber (including a slight amount of combustion gas) during the compression and explosion processes of the engine
Leaks from the gap between the inner wall of the cylinder and the piston ring and accumulates in the crank chamber. The air-fuel mixture that leaks into the crank chamber is called blow-by gas. Since most of this blow-by gas is unburned gas, from the viewpoint of fuel economy, this blow-by gas is introduced into the intake system, returned to the combustion chamber again, and re-combusted. Also,
Since there is a large amount of lubricating oil in the crank chamber, this lubricating oil mixes into blow-by gas. In this way, when re-combusting the blow-by gas mixed with the lubricating oil, carbon is generated and the cylinder is abraded or incompletely burned, which adversely affects the engine performance. It is necessary to separate the lubricating oil (hereinafter referred to as oil) from the blow-by gas before introducing into the intake system.

As shown in FIG. 7, a conventional oil separator (blow-by gas gas-liquid separator) is provided with a blow-by gas passage 1 communicating with the crank chamber on the side surface of a cylinder head 2. Blow-by gas passage 1 is head cover 3
A blow-by gas passage 5 is provided in the head cover 3 so as to communicate with the breather chamber 4 formed by, and the inflow direction from the blow-by gas inlet 6 into the breather chamber 4 is not regulated. The blow-by gas is made to flow in as indicated by the arrow. Then, in order to efficiently separate the oil from the blow-by gas in the breather chamber 4, as shown in, for example, Japanese Patent Application Laid-Open No. 8-177443, a bypass is made into the breather chamber. A guide wall is provided. And blow along this detour guide wall
By flowing the by-gas, the flow path of the blow-by gas is lengthened, and the oil is separated from the blow-by gas by the collision with the bypass guide wall.

Further, as shown in FIG. 8, the blow-by gas flow is provided so that the blow-by gas passage 1 provided on the side surface of the cylinder head 2 is opened to the cam chamber in which the cam 8, the cam shaft 9 and the cam spring 10 are opened. In the state where the inlet 7 is provided and the inflow direction is not regulated, the blowby gas that has flown into the cam chamber as shown by the arrow comes into contact with the cam 8, the camshaft 9 and the cam spring 10, and then the inflow direction is not regulated. It is designed to flow into the breather chamber 4 as indicated by the arrow. Further, Japanese Patent Laid-Open No. 8-177443 discloses that
It is disclosed that a head cover is provided with an oil-proof cover located below the breather chamber to prevent blow-by gas from entering the cam chamber.

[0005]

In the conventional blow-by gas separation apparatus described above, the blow-by gas is introduced into the breather chamber in a state where the inflow direction into the breather chamber is not regulated as shown in FIG. When the oil is made to flow in, it is not possible to sufficiently separate the oil in the breather chamber.
An equivalent to the detour guide wall is required in the room. Therefore, the structure of the breather chamber becomes complicated, and the head cover becomes expensive, which is not preferable, and the weight of the head cover increases, which increases the engine load, which is not preferable.

Further, as shown in FIG. 8, when the blow-by gas is allowed to flow into the cam chamber without restricting the inflow direction,
Since a large amount of oil is mixed in this blow-by gas, when the blow-by gas comes into contact with the cam, camshaft or cam spring, the mixed oil is scattered and the oil is separated from the blow-by gas. If the oil enters the breather chamber without being separated in the cam chamber, the amount of oil to be separated in the breather chamber becomes large,
In order to separate this oil, the structure inside the breather chamber must be further complicated, which is not preferable because it is an expensive head cover, and the weight is correspondingly large and the engine load is large, which is not preferable.

According to the present invention, by regulating the flow direction of blow-by gas, the oil can be reliably separated, the wear of the cylinder is reduced, and the engine performance is not adversely affected. With a simple structure, the weight is reduced, the load on the engine is reduced, and the blower is inexpensive.
The invention provides a separator for a bigus.

[0008]

According to another aspect of the invention, there is provided a partition wall inside a head cover arranged above a cam chamber to form a breather chamber. A blow-by gas passage that connects the breather chamber and the crank chamber is provided, and a blow-by gas inflow hole that connects the portion provided on the side surface of the head cover of the blow-by gas passage and the breather chamber is provided in the breather chamber.
It is installed in the partition wall so that the inflow direction of blow-by gas is from above the breather chamber to the oil drain hole provided in the bottom of the breather chamber.The oil drain hole is located close to the partition wall and the bottom of the breather chamber is placed. The bottom portion of the breather chamber in which the oil drain hole is located is recessed compared to other bottom portions, and the ceiling portion of the head cover connected to the partition wall is lower than the ceiling portion of the other breather chamber. It is characterized by being formed.

According to a second aspect of the present invention, there is provided the blow-by gas gas-liquid separation device according to the first aspect of the invention.
The feature is that a PCV valve is provided on the side surface of the head cover .

According to a third aspect of the invention of a blow-by gas gas-liquid separating apparatus, a partition wall is provided inside a head cover arranged above a cam chamber to form a breather chamber, and the breather chamber and the crank chamber are formed. A blow-by gas passage for communicating with the cam chamber, and a blow-by gas inflow hole for communicating the portion provided on the side surface of the head cover of the blow-by gas passage with the cam chamber is located above the cam shaft. The breather room
The blow-by gas inflow hole is provided on the wall so that the inflow direction of the blow-by gas is in the direction of the breather chamber while avoiding the rotating part in the cam chamber, and at the bottom of the breather chamber above the blow-by gas inflow hole. Blow-by gas is made to flow into the breather chamber from the cam chamber through the hole provided.

According to the invention of the blow-by gas gas- liquid separator of the first aspect, the inflow direction of the blow-by gas is changed.
Oil drainer installed from the top of the breather chamber to the bottom of the breather chamber
Blow-by gas inflow hole is provided to face the hole
Therefore, it flows into the breather chamber from the blow-by gas passage.
The direction of inflow of blow-by gas
It And the blow-by gas from the blow-by gas passage
The flow velocity is increased by passing through the blow-by gas inflow hole.
And is directed at high flow rates and as described above.
Collides with the bottom of the breather chamber.

Gas-liquid separation of blow-by gas according to claim 2
According to the invention of the device, the blow-by gas from the blow-in gas inlet is blown.
− By-gas flow direction and blow-by from PCV valve
The gas outflow direction is opposite.

Gas-liquid separation of blow-by gas according to claim 3
According to the invention of the device, the oil separated in the cam chamber is
Not scattered by the minute, and scattered by the rotating part
Even if it does, the splash does not reach far, so the oil blows
The cam chamber can be used as a separation chamber without being mixed in bygas.
It becomes possible to use.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention grasped from the description of each of the above claims will be described. First, the embodiment of the present invention grasped from the description of claim 1 is as shown in FIG.
As shown in FIG. 6, a partition wall 21 is provided inside the head cover 3 disposed above the cam chamber 17 to form a breather chamber 401, and a blow-by gas passage for communicating the breather chamber 401 with the crank chamber 11 is provided. A blow-by gas inflow hole 14 is provided for communicating the part of the blow-by gas passage 13 provided on the side surface of the head cover 3 with the breather chamber 401.
It is provided in the partition wall 20 of the breather chamber 401 so that the inflow direction of blow-by gas is directed from above the breather chamber 401 to the oil drain hole 16 provided in the bottom 15 of the breather chamber 401.
The bottom 15 of the breather chamber 401 with the 16 close to the partition wall 21.
The bottom portion 15 of the breather chamber 401 in which the oil drain hole 16 is located is formed to be recessed as compared with other bottom portions, and the ceiling portion of the head cover 3 connected to the partition wall 21 is provided in another breather chamber. It was formed lower than the ceiling part of 401 .

Next, in the embodiment of the present invention grasped from the description of claim 2, as shown in FIGS. 1 and 5, a PCV valve 22 is provided on the side surface of the head cover 3.

Next, an embodiment of the present invention grasped from the description of claim 3 is, as shown in FIGS. 2 and 6, a cam chamber.
A partition wall 21 is provided inside the head cover 3 arranged on the upper part of 17.
Is provided to form a breather chamber 401 , a blow-by gas passage 13 for communicating the breather chamber 401 and the crank chamber 11 is provided so as to be located in the middle of the cam 8, and provided on the side surface of the head cover 3 of the blow-by gas passage 13. partition 2 0 of the breather chamber 401 to the blow-by gas inlet 18 located above the cam shaft 9 is site and communicating with the cam chamber 17
The blow-by gas inlet hole 18 is provided upward so that the flow-in direction of the blow-by gas is in the direction of the breather chamber 401 while avoiding the rotating portion in the cam chamber 17, and the breather above the blow-by gas inlet hole 18 is provided. the blow-by gas to flow into the breather chamber 401 from the cam chamber 17 through the holes 18 'provided in the bottom 15 of the chamber 401.

The embodiments of the present invention will be described in more detail below. In FIG. 6, the breather chamber 4 is divided by a partition wall 21 into two breather chambers 401 and 402. Of these, the blow-by gas separated in the breather chamber 401 was PC.
It is designed to be introduced to the downstream side of the throttle valve of the air supply system via the V valve, while the blow-by gas separated in the breather chamber 402 is introduced to the upstream side of the throttle valve. Has become.

The breather chamber 401 is connected to the crank chamber 11 by the blow-by gas passage 13, and sucks the blow-by gas leaked into the crank chamber 11 due to the negative pressure of the manifold. On the other hand, a passage communicating with the cam chamber 17 is provided on the breather chamber 402 side, and the crank chamber 11 is provided in the cam chamber 17.
There is an oil drain passage 19 communicating with the
The blow-by gas in the oil drop passage 19 and the cam chamber of the cylinder head 2 is sucked by the negative pressure of the intake manifold. An oil gauge seat 23 is fitted in the top opening of the blow-by gas passage 13 to close the top opening of the blow-by gas passage 13.

FIG. 1 is an enlarged view of the breather chamber 401 side. 1 and 3, the blow-by gas passage 13 includes a breather chamber 401 and a cylinder block 12 (FIG. 6).
The cylinder head 2 and the cylinder head 2 are separated from each other, and the partition wall 20 provided in the breather chamber 401 is provided with a blow-by inlet 14. In this way, by providing the blow-by gas passage 13 in an isolated state, the negative pressure of the manifold is effectively used to efficiently ventilate the crank chamber 11 and blow-by gas into the lubricating oil. (Air bubbles)
To prevent the deterioration of the lubricating performance of the lubricating oil,
It is possible to prevent energy loss due to deterioration of lubrication performance and prevent deterioration of engine performance. Also, since there is no mixing of oil from parts other than the crank chamber 11, the breather chamber
The separation of oil within 401 can be facilitated. Also,
By increasing the flow velocity of the blow-by gas in the blow-by gas passage 13, the cooling effect of the blow-by gas is enhanced, the oil droplets contained in the blow-by gas are condensed, and the oil separation is blown. It can be done to some extent in the bypass passage 13.

In FIG. 5, a substantially central portion of the inside of the head cover 3 is partitioned by a partition wall 21 to form a breather chamber 401.
402 is formed. The volume of the breather chamber 402 is made slightly larger than that of the breather chamber 401, so that the vapor-liquid separation can be performed. A blow-by gas passage 13 is provided at the edge of the head cover 3 forming the breather chamber 401, and an oil draining hole 16 is formed near the partition wall 21 and a blow-by gas passage is provided. A PCV valve 22 is provided at the corner of the side surface of the head cover 3 where 13 is provided, so that the retention time of blow-by gas is lengthened and gas-liquid separation is sufficiently performed.

The blow-by gas inlet 14 is shown in FIG.
As shown in FIG. 5, the blow-by gas flows from above the breather chamber 401 toward the bottom 15 in the direction of the arrow, and as shown in FIG. It is open. Further, as shown in FIG. 5, the outflow direction of the blowby gas from the blowby gas inflow hole 14 and the outflow direction of the blowby gas from the PCV valve 22 are opposite to each other.

In this way, by making the flow of blow-by gas reverse, the blow-by gas flowing from the blow-by gas inflow hole 14 changes its flow direction at the bottom 15 and collides with the partition wall 21. While reversing, it will flow out from the PCV valve 22. Further, as shown in FIG. 1, the ceiling of the head cover 3 is lowered by H1 at the partition wall 21, and when it is inverted by the partition wall 21, it is guided by the ceiling of the head cover 3 and forcedly inverted strongly. . Further, as can be seen from FIG. 1, an oil draining hole 16 is formed in a portion where the partition wall 21 is reversed to separate the oil.

Next, the operation will be described. In FIGS. 1 and 6, since the blow-by gas passage 13 that communicates from the crank chamber 11 to the breather chamber 401 formed by the head cover 3 is provided, oil does not enter from the portion other than the crank chamber 11. . Then, the blow-by gas passage 13 and the breather chamber 4 are arranged so as to regulate the inflow direction of the blow-by gas flowing from the blow-by gas passage 13 into the breather chamber 401.
By providing the blow-by gas inflow hole 14 with 01, the flow velocity of the blow-by gas flowing into the breather chamber 401 can be increased, and the flow direction can be optimized so that the oil due to the difference in specific gravity can be used. The oil is separated by separating the oil and collecting the oil droplets.

Further, as shown in FIG. 1, the blow-by gas is directed toward the oil drop hole 16 formed in the bottom 15 of the breather chamber 401 from above the breather chamber 401. Since the blow-by gas collides with the bottom 15 of the breather chamber 401 at a high flow rate, oil having a large specific gravity is separated by inertial force and collides with the bottom 15 to be captured, and at the same time, the specific gravity is increased. The blow-by gas having a small amount flows as it is and is separated from the oil, and since the blow-by gas flows toward the oil drop hole 16, the separated oil is recovered from the oil drop hole and is again returned to the blow-by gas. It cannot be mixed.

Further, the oil drain hole 16 is provided in the portion where the blow-by gas is reversed by the partition wall 21 (in the vicinity of the partition wall 21), and the PCV valve 22 is provided on the side wall of the head cover-3 in which the blow-by gas passage 13 is provided. By installing in the corner of
The blow-by gas that has flowed in at an increased flow rate from the blow-by gas inflow hole 14 is separated from the oil having a large specific gravity by inertial force when the flow direction is changed along the bottom 15, and
The separated oil adheres to the bottom 15 and is captured.
Even when the oil is inverted at 21, the oil is separated by the inertial force, and the separated oil adheres to and is captured by the partition wall 21 and the ceiling of the head cover 3, and is collected from the oil drop hole 16.

At the same time, the oil droplets contained in the blow-by gas are cooled and aggregated when the blow-by gas collides with the bottom 15 and the partition wall 21 at a high flow rate, and the aggregated oil is separated by inertial force. Are collected and collected. And FIG.
As shown in, since the bottom 15 provided with the oil drop hole 16 is recessed, the oil blown off by inertial force falls into this recess, and the separated oil can be efficiently collected.

Next, the embodiment shown in FIG. 2 will be described. In the embodiment shown in FIG. 2, the blow-by gas passage 13 is provided as in the case shown in FIG. 1, so that the blow-by gas passage 13 communicates with the cam chamber 17 of the head cover 3 in which the cam 8 is provided. A blow-by gas inflow hole 18 is opened.
This blow-by gas passage 13 is provided with a cam 8 as shown in FIG.
2 is located in the middle position of the blow shaft, and is located on the upper side of the camshaft 9 as shown in FIG. 2, and further upward in the direction of the breather chamber 401. The blow-by gas flowing into the cam chamber 17 is guided to the breather chamber 401 through the hole 18 'formed in the bottom 15 without contacting the cam 8 and the cam shaft 9. Also, the cam spring 10 is the camshaft 9
The blow-by gas does not come into contact with the cam spring 10 as a matter of course because it is on the lower side. In this embodiment, the bottom 15 may be omitted.

Next, the operation will be described. 2 and 6, the crank chamber 11 to the cam chamber of the head cover 3
Since the blow-by gas passage 13 communicating with 17 is provided, oil does not enter from a portion other than the crank chamber 11. Further, since the cam chamber 17 having a large volume is used as a breather chamber, sufficient oil can be separated. The direction of the blow-by gas flowing into the cam chamber 17 is the cam 8 in the cam chamber 17.
Further, since the blow gas inflow hole 18 is provided between the blow-by gas passage 13 and the cam chamber 17 so as to avoid the cam shaft 9, the oil once separated in the cam chamber 17 can be removed by the cam 8 and the cam shaft 9. Even if it is scattered, it will not be mixed in the blow-by gas again. Further, as shown in FIG. 3, by providing the blow-by gas passage 13 between the cams 8, the cam chamber
The oil separated in 17 is not scattered by the cam 8 and even if it is scattered by the cam shaft 9, the scattering does not reach far, so that the oil is not mixed in the blow-by gas.

In the embodiment shown in FIGS. 1 and 2, the blow-by gas passage 13 is provided independently of the cylinder block 12 and the cylinder head 2.
The negative pressure of the manifold is effectively used through the breather chamber 401 to efficiently ventilate the crank chamber 11, and the gas-liquid separation in the breather chamber 401 is ensured. -By mixing the by-gas (air bubbles), it is possible to prevent the deterioration of the lubricating performance of the lubricating oil, and it is possible to prevent the energy loss due to the deterioration of the lubricating performance and to prevent the deterioration of the engine performance.

[0030]

EFFECT OF THE INVENTION Gas-liquid component of blow-by gas according to claim 1
According to the invention of the separating device, the inflow direction of the blow-by gas is blocked.
An oil drain hole provided from above the breather chamber to the bottom of the breather chamber
Blow-by gas inflow hole is provided to face
And then flow into the breather chamber from the blowby gas passage.
The inflow direction of blow-by gas can be oriented.
The blow-by gas from the blow-by gas passage is blocked.
If the flow velocity is increased by passing through the low-by gas inlet
And is directed at high flow rates and as described above.
It collides with the bottom of the laser chamber. In this way, blowby gas
By colliding with the bottom, oil with a large specific gravity is
Is separated and collided with the bottom and captured, and the specific gravity is small.
If the blow-by gas flows as it is and separates from the oil,
Blow-by gas should flow into the oil drain hole.
The separated oil is collected from the oil drop hole and
It never mixes again with Igas. Furthermore, with a partition wall
Connect the ceiling part of the head cover to be connected to the top of the other breather room.
Because the structure is lower than the well,
Flowed through the bypass gas inlet hole at a faster flow rate
Blow-by gas is used when the partition wall is turned over.
Guided by the ceiling part of the head cover that connects to the wall,
Forcibly reversing force efficiently due to inertial force
Can be separated. Moreover, the breather chamber where the oil drain hole is located
It is said that the bottom part of the
Due to the adoption of the configuration, the oil scraped off by inertial force
It is possible to efficiently collect the separated oil that has fallen into the hollow of the
it can. Further, a blow-by gas inflow hole is provided to increase the flow velocity of the blow-by gas flowing into the breather chamber, and the flow direction is optimized to separate oil and collect oil droplets due to the difference in specific gravity. Since the oil is separated by means of the above, the structure of the head cover can be simplified and an inexpensive blow-by gas separating device can be obtained, and the weight can be reduced to reduce the engine load.

Gas-liquid separation of blow-by gas according to claim 2
According to the invention of the device, the blow-by gas from the blow-in gas inlet is blown.
− By-gas flow direction and blow-by from PCV valve
Since the outflow direction of the gas is opposite, blow-by gas
Retention time can be extended and gas-liquid separation can be performed sufficiently.
It

According to the invention of the blow-by gas gas-liquid separation device of the third aspect, the oil separated in the cam chamber is not scattered by the rotating portion, and even if it is scattered by the rotating portion, it is scattered. Since it does not reach far, oil blows
The cam chamber can be used as a separation chamber without being mixed with the bigas. Further, Brie the blow-by gas inlet such that the flowing direction of the blowby gas is in the direction of the breather chamber while avoiding the rotating portion of the cam chamber
Since it is provided upward on the partition wall provided in the chamber, even if the oil once separated in the cam chamber is scattered by the rotating portion, it will not be mixed in the blow-by gas again. Also,
Even if the oil once separated in the cam chamber is scattered by the rotating part, it will not mix again in the blow-by gas.Therefore, it is not necessary to provide an oil mixing prevention member in the cam chamber, and the number of assembly parts can be reduced, It is possible to improve the sticking property, reduce the weight to reduce the engine load, further ensure the oil separation, reduce the wear of the cylinder, and prevent the engine performance from being adversely affected.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing the main parts of another embodiment of the present invention.

3 is a plan view of the cylinder head in FIGS. 1 and 2. FIG.

4 is a vertical sectional view taken along the line AA of FIG.

5 is a rear view of the head cover in FIG. 1. FIG.

FIG. 6 is a vertical cross-sectional view showing the entire engine to which the blow-by gas separation device in FIG. 1 is applied.

FIG. 7 is a vertical sectional view showing a main part of a conventional example.

FIG. 8 is a vertical cross-sectional view showing a main part of a conventional example.

[Explanation of symbols]

2 cylinder head 3 head cover 4 Breather room 11 crank chamber 12 cylinder block 13 Blow-by gas passage 14 Blow-by gas inlet 16 Oil drop hole 17 Cam room 18 Blow-by gas inlet 19 Oil drop passage 22 PCV valve

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoji Takeuchi, 300, Takatsuka-cho, Hamamatsu-shi, Shizuoka Prefecture Suzuki Stock Company (56) References: Actual Development 4-59322 (JP, U) Actual Development: Sho 56-175507 ( JP, U) Actually open 1-14811 (JP, U) Actually open 61-17114 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F01M 13/04 F01M 13/00

Claims (3)

(57) [Claims] 1. A head cover disposed in the upper part of a cam chamber is provided with a partition wall to form a breather chamber, and a blow-by gas passage for connecting the breather chamber and the crank chamber is provided, and a head cover of the blow-by gas passage. The blow-by gas inflow hole that connects the portion provided on the side surface of the breather chamber to the breather chamber is provided in the partition wall provided in the breather chamber, and the blow-by gas inflow direction is from above the breather chamber to the bottom of the breather chamber. It is provided so as to face the hole, and this oil drop hole is provided in the bottom of the breather chamber close to the partition wall, and the bottom part of the breather chamber where this oil drop hole is located is formed to be recessed compared to other bottom parts. In addition, the ceiling portion of the head cover connected to the partition wall is formed to be lower than the ceiling portion of the other breather chamber. Gas-liquid separation device. 2. The gas-liquid separator for blow-by gas according to claim 1, wherein a PCV valve is provided on a side surface of the head cover . 3. A partition wall is provided inside a head cover disposed above the cam chamber to form a breather chamber, and a blow-by gas passage that connects the breather chamber and the crank chamber is located in the middle of the cam. And a blow-by gas inflow hole for communicating the portion provided on the side surface of the head cover of the blow-by gas passage with the cam chamber is provided in the breather chamber so as to be located above the cam shaft.
The blow-by gas inlet is provided upward so that the flow-in direction of the blow-by gas is in the direction of the breather chamber while avoiding the rotating part in the cam chamber, and the breather chamber above the blow-by gas inlet hole is provided. Blow-by gas is introduced into the breather chamber from the cam chamber through a hole provided at the bottom of the blow-by gas.