JP2005282390A - Breather device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of a conventional breather device that an inlet portion of blowby gas of a breather chamber is structured in a duct extending downward from a bottom plate, wherein the inside of the duct is flat without protrusions formed therein, so that when oil on a cylinder head face is shaken violently, the oil directly enters the duct, and a predetermined breathing performance cannot be secured. <P>SOLUTION: In a breather device of an engine for removing oil mist in blowby gas, a baffle plate is provided at the lower edge of the inlet duct 6 protruding downward from an opening portion 5a of a shield plate 5 which is the inlet portion of the breather chamber 21. The baffle plate comprises a slant plate 6b extending slantingly downward from the lower edge of a guide part 6a of the inlet duct 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a configuration of a breather device for an engine that is configured in a valve arm chamber that covers an upper portion of a cylinder head.

2. Description of the Related Art Conventionally, an engine is known in which a breather chamber is formed in a valve arm case that covers an upper portion of a cylinder head, and blower gas containing oil mist is separated into a gas component and an oil component by the breather chamber. ing.
This breather chamber is composed of a space surrounded by a shield plate provided at a predetermined interval with respect to the inner wall surface of the valve arm case and the upper surface of the valve arm case. It is comprised so that the oil component in blow-by gas may be captured (refer patent document 1).

JP 2003-90204 A

However, the inlet part of the blow-by gas in the above-mentioned breather chamber is configured as a duct extending downward from the bottom plate, and no projections are formed in the duct, and it has a flat shape.
Therefore, when the oil on the cylinder head surface is vigorously shaken (for example, when the oil surface is vibrated by a valve or the like), the oil directly enters the duct, and the predetermined breather performance cannot be ensured. Sometimes.
Therefore, the present invention provides a breather device configured so that the oil does not directly enter the duct even when the oil is vigorously shaken.

The breather device that solves the above problems has the following features.
That is, in the engine breather device for removing oil mist in blow-by gas as described in claim 1, a baffle plate is provided at the lower end of the inlet duct protruding downward from the inlet portion of the breather chamber. The slant plate extends obliquely downward from the lower end of the inlet duct.
As a result, when the oil level of the lubricating oil in the cylinder head vibrates vigorously, for example, by a valve or the like, and the lubricating oil splashes upward from the oil level, the scattered lubricating oil hits the baffle plate and falls downward. Therefore, it is prevented from entering the inlet duct, and the performance of the breather device such as oil draining can be improved.

Moreover, in the engine breather device for removing oil mist in blow-by gas as described in claim 2,
A baffle plate is provided at the lower end of the inlet duct that protrudes downward from the inlet portion of the breather chamber. The baffle plate extends obliquely downward from the lower end of the inlet duct, and extends horizontally from the lower end of the diagonal plate. It consists of a horizontal plate.
As a result, when the oil level of the lubricating oil in the cylinder head vibrates vigorously, for example, by a valve or the like, and the lubricating oil splashes upward from the oil level, the scattered lubricating oil hits the baffle plate and falls downward. Therefore, it is prevented from entering the inlet duct, and the performance of the breather device such as oil draining can be improved.
In particular, since the baffle plate is composed of an oblique plate and a horizontal plate, it is possible to completely cover the open portion at the lower end of the inlet duct with the baffle plate in the bottom view, and into the inlet duct. The effect of preventing the intrusion of the lubricating oil can be further enhanced.

According to a third aspect of the present invention, in the engine breather device for removing oil mist in the blow-by gas, a baffle plate is provided at the lower end of the inlet duct protruding downward from the inlet portion of the breather chamber. It comprised with the diagonal board extended diagonally downward from the lower end of an entrance duct, and cut off the opposite side to the base end part side of the baffle board in the lower end of an entrance duct.
As a result, when the oil level of the lubricating oil in the cylinder head vibrates vigorously, for example, by a valve or the like, and the lubricating oil splashes upward from the oil level, the scattered lubricating oil hits the baffle plate and falls downward. Therefore, it is prevented from entering the inlet duct, and the performance of the breather device such as oil draining can be improved.
In addition, the area of the opening at the lower end of the inlet duct can be expanded to ensure a wide opening area of the inlet duct, the flow velocity of blow-by gas passing through the opening can be reduced, and the inlet duct enters. The amount of oil mist can be reduced.

According to a fourth aspect of the present invention, in the engine breather device for removing oil mist in the blow-by gas, a baffle plate is provided at the lower end of the inlet duct protruding downward from the inlet portion of the breather chamber. Consists of a diagonal plate that extends diagonally downward from the lower end of the inlet duct and a horizontal plate that extends horizontally from the lower end of the diagonal plate, and is opposite to the base end side of the baffle plate at the lower end of the inlet duct Cut out.
As a result, when the oil level of the lubricating oil in the cylinder head vibrates vigorously, for example, by a valve or the like, and the lubricating oil splashes upward from the oil level, the scattered lubricating oil hits the baffle plate and falls downward. Therefore, it is prevented from entering the inlet duct, and the performance of the breather device such as oil draining can be improved.
In particular, since the baffle plate is composed of an oblique plate and a horizontal plate, it is possible to completely cover the open portion at the lower end of the inlet duct with the baffle plate in the bottom view, and into the inlet duct. The effect of preventing the intrusion of the lubricating oil can be further enhanced.
In addition, the area of the opening at the lower end of the inlet duct can be expanded to ensure a wide opening area of the inlet duct, the flow velocity of blow-by gas passing through the opening can be reduced, and the inlet duct enters. The amount of oil mist can be reduced.

According to a fifth aspect of the present invention, the baffle plate substantially closes the opening of the inlet duct as viewed from the bottom.
Accordingly, it is possible to enhance the effect of preventing the lubricating oil scattered upward from directly entering the inlet duct.

According to a sixth aspect of the present invention, the baffle plate is formed by extending and bending a member for forming an inlet duct downward.
As a result, the inlet duct and the baffle plate can be formed of a single sheet metal member, the structure of the inlet duct can be simplified, and the cost can be reduced.

According to a seventh aspect of the present invention, the inlet duct is formed in a substantially rectangular tube shape, and a baffle plate is formed by extending one side of the inlet duct downward and bending inward to form a baffle plate. The surface opposite to the surface on which was formed was cut out.
As a result, the inlet duct and the baffle plate can be formed by a single sheet metal member, and the notch can be formed at the same time when the inlet duct is formed by the sheet metal. Cost can be reduced.

According to another aspect of the present invention, there is provided an engine breather device for removing oil mist in blow-by gas, wherein an inlet duct is disposed between a valve arm cover side wall and a valve arm support base in the valve arm cover. In the breather device, both ends of the inlet duct were extended toward the valve arm support base so as to surround the end of the valve arm support base, and formed in a substantially “U” shape in plan view.
Thereby, compared with the case where an inlet duct is formed only with a square-shaped duct, the opening area of the opening part of an inlet duct lower end can be ensured large.
As a result, the flow rate of blow-by gas entering the inlet duct from the opening can be reduced, and breather performance such as oil removal and oil transfer can be improved.

Further, as described in claim 9, in the engine breather device for removing oil mist in blow-by gas, a plurality of partition plates are provided inside the inlet duct of the breather chamber, and the plurality of partition plates are arranged alternately. .
Thereby, the oil mist which tries to enter together with the blow-by gas entering the inlet duct from the opening of the inlet duct collides with the partition plate and is removed while passing through the inlet duct. Moreover, the path | route through which blow-by gas passes in an entrance duct can be lengthened by providing a partition plate.
Thereby, the intrusion of oil mist into the breather chamber can be reduced, and the oil drainage performance of the inlet duct can be improved.

Further, in the engine breather device for removing oil mist in blow-by gas as defined in claim 10, a plurality of oil trap members are disposed in the breather chamber, and the oil is located upstream in the blow-by gas flow direction. The trap material was made finer than the oil trap material located on the downstream side.
As a result, fine oil mist and gaseous oil mist can be captured by the fine oil trap material on the upstream side, and large oil particles in which the oil droplets of the captured fine oil mist and gaseous oil mist have grown Can be captured by a rough oil trap material on the downstream side, and the amount of oil mist discharged to the outside of the breather chamber can be reduced.
As a result, even when the engine is operated for a long time with the intake reduction specification, it is possible to reduce deposits caused by the lubricating oil adhering to the intake manifold, the intake valve, and the like.

Further, as claimed in claim 11, an engine breather device for removing oil mist in blow-by gas, wherein a mist separator is disposed on the downstream side of the breather chamber.
A plurality of oil trap materials are provided in the mist separator, and the eyes of the oil trap materials located on the upstream side in the blow-by gas flow direction are made finer than the eyes of the oil trap materials located on the downstream side.
As a result, the amount of oil mist discharged from the breather chamber is reduced, and the oil removal performance can be improved. And the oil-drop dripping from a blow-by hose can also be prevented.
Further, the separation of the oil mist from the blow-by gas is not performed only by gravity, but is mainly performed by capturing the oil mist with an oil trap material, so that restrictions on the installation posture of the mist separator can be reduced.
Furthermore, it is possible to ensure oil drainage performance for performing intake air reduction in an engine with a turbocharger.

Further, according to the twelfth aspect of the present invention, there is provided a breather device for an engine for removing oil mist in blow-by gas, wherein the mist separator has a mist separator disposed on the downstream side of the breather chamber. A partition plate for partitioning the space in the mist separator into an upstream space and a downstream space is provided, and an oil trap material is provided in each of the upstream space and the downstream space to provide the upstream space. The eyes of the oil trap material to be formed were made finer than the eyes of the oil trap material provided in the downstream space.
As a result, the amount of oil mist discharged from the breather chamber is reduced, and the oil removal performance can be improved. And the oil-drop dripping from a blow-by hose can also be prevented.
Further, the separation of the oil mist from the blow-by gas is not performed only by gravity, but is mainly performed by capturing the oil mist with an oil trap material, so that restrictions on the installation posture of the mist separator can be reduced.
Furthermore, it is possible to ensure oil drainage performance for performing intake air reduction in an engine with a turbocharger.

According to the present invention, when the lubricating oil splashes upward from the oil surface of the lubricating oil in the cylinder head, the scattered lubricating oil is prevented from entering the inlet duct, and a breather such as oil drain or oil transfer is prevented. The performance of the apparatus can be improved.
Further, the amount of oil mist discharged outside the breather chamber can be reduced.

Next, modes for carrying out the present invention will be described with reference to the accompanying drawings.
The breather apparatus of the present invention will be described.
As shown in FIG. 1, a valve arm case 2 is disposed above the cylinder head 1 of the engine, and a valve arm chamber 20 is formed in the valve arm case 2. A breather chamber 21 is formed in the interior.

A shielding plate 5 is provided in the valve arm chamber 20 at a predetermined interval with respect to the upper surface 2 a of the valve arm case 2, and the breather chamber 21 includes the shielding plate 5 and the upper surface 2 a of the valve arm case 2. It is composed of a space surrounded by the inner wall surface such as the side surface.
An inlet duct 6 extends downward from the shielding plate 5, and the valve arm chamber 20 and the breather chamber 21 communicate with each other through the inlet duct 6.

The valve arm case 2 is provided with a gas passage 22 and a pressure control chamber 8. The pressure control chamber 8 is interposed between the breather chamber 21 and the gas passage 22. Normally, the diaphragm 8 of the pressure control chamber 8 is closed and the breather chamber 21 and the gas passage 22 are separated. .
Further, when the pressure in the breather chamber 21 becomes a predetermined pressure or more, the diaphragm 8 is opened by the pressure, and the breather chamber 21 and the gas passage 22 are communicated with each other.

  When the breather chamber 21 communicates with the gas passage 22, blow-by gas in the valve arm chamber 20 enters the breather chamber 21 through the inlet duct 6. The blow-by gas that has entered the breather chamber 21 is discharged to the outside through the gas passage 22 after the oil component is removed in the breather chamber 21.

An oil trap material 11 such as a filter net is disposed above the inlet duct 6 in the breather chamber 21. When the blow-by gas passes through the oil trap material 11, the oil trap material 11 Oil mist is captured and the oil component is removed.
Also, when blow-by gas passes through the inlet duct 6, oil mist adheres to the inner wall surface of the inlet duct 21 and the oil component in the blow-by gas is removed.

Next, the configuration of the inlet duct 6 will be described.
As shown in FIGS. 2 and 3, the inlet duct 6 includes a guide portion 6a formed in a substantially rectangular tube shape, and an oblique plate 6b extending obliquely downward from the lower end of one surface of the guide portion 6a. .
The guide portion 6 a is attached to the lower surface of the shielding plate 5 and is connected to the opening portion 5 a of the shielding plate 5. In addition, the oil trap material 11 is disposed in the opening 5 a portion on the upper surface of the shielding plate 5.

  A breather device is configured by the inlet duct 6 configured as described above, the breather chamber 21, and the like. In the inlet duct 6, blow-by gas in the valve arm chamber 20 is a diagonal plate at the lower end of the guide portion 6a. The breather chamber 21 passes through the oil trap member 11 while passing through the oil trap material 11 through the guide 6a through the guide 6a through the opening 6c that opens to the opposite side of the 6b formation side. Invade inside.

Further, when the oil level of the lubricating oil in the cylinder head 1 vibrates violently, for example, by a valve or the like, the lubricating oil may scatter upward from the oil level.
In such a case, the scattered lubricating oil hits the diagonal plate 6b formed at the lower end of the guide portion 6a and falls downward, so that it is prevented from entering the guide portion 6a. That is, the slanting plate 6b serves as a baffle plate for preventing the scattered lubricating oil from entering the inlet duct 6. The slanted plate 6b improves the performance of the breather device such as oil draining. can do.

  In particular, as shown in FIG. 3, the opening portion at the lower end of the guide portion 6 a is substantially covered with an oblique plate 6 b in a bottom view, and the lubricating oil scattered upwards directly into the inlet duct 6. Increases the effect of preventing intrusion.

  Since the oblique plate 6b is integrally formed by bending the lower end of the guide portion 6a obliquely, the guide portion 6a and the oblique plate 6b can be formed of a single sheet metal member. The structure can be simplified and the cost can be reduced.

Further, in the inlet duct 6 shown in FIG. 3, the baffle plate constituted by the diagonal plate 6b extending downward from the lower end of the guide portion 6a is the diagonal plate 6b and the diagonal plate 6b as shown in FIG. It can also be constituted by a horizontal plate 6d extending in the horizontal direction from the lower end of the.
As described above, in the inlet duct 6 shown in FIG. 4, the horizontal plate 6d is further extended from the lower end of the oblique plate 6b, and the open portion at the lower end of the guide portion 6a is seen from the oblique plate 6b and the horizontal in the bottom view. The effect of preventing the lubricating oil from entering the inlet duct 6 is further enhanced by completely covering the plate 6d.

When a baffle plate is provided at the lower end of the guide portion 6a as in the inlet duct 6 shown in FIGS. 3 and 4, the opening area of the opening 6c at the lower end portion of the inlet duct 6 is reduced by the baffle plate. It tends to be smaller than when it is not provided (when the baffle plate is not provided, the entire area of the lower end of the opening 6c is the opening area).
Here, when the opening area of the opening 6c corresponding to the inlet of the blow-by gas decreases, the flow velocity of the blow-by gas passing through the opening 6c increases, and the blow-by gas is trapped by the blow-by gas when entering the inlet duct 6. The amount of oil mist that enters the inlet duct 6 will increase.

Therefore, in the inlet duct 6 shown in FIGS. 5 and 6, the lower end of the guide portion 6a is cut away on the side opposite to the base end side (right side in FIG. 5) (left side in FIG. 5) of the oblique plate 6b. A notch 6e is formed to increase the opening area of the opening 6c serving as a blow-by gas inlet.
Thus, by forming the notch 6e and enlarging the area of the opening 6c of the inlet duct 6, a wide opening area of the inlet duct 6 can be secured, and the blow-by gas passing through the opening 6c can be secured. The flow rate can be reduced, and the amount of oil mist that enters the inlet duct 6 can be reduced.
Moreover, since the notch part 6e can be formed simultaneously when shape | molding the guide part 6a with a sheet metal, cost reduction can be achieved.

In order to prevent oil mist from entering the breather chamber 21 from the inlet duct 6 of the breather device, the inlet duct 6 can also be configured as follows.
The inlet duct 6 shown in FIG. 9 is constituted by a guide portion 6a formed in a substantially rectangular tube shape, and the lower end of the guide portion 6a is opened to form an opening 6c.
In the guide portion 6a, a plurality of partition plates 6g and 6g are provided, and the plurality of partition plates 6g and 6g are arranged in a plurality of upper and lower stages and alternately arranged in the front and rear (left and right in FIG. 9). Yes.

In this example, two partition plates 6g and 6g are provided, and the upper partition plate 6g projects forward from the rear (right side in FIG. 9) wall surface of the guide portion 6a, and the lower partition plate 6g. Projecting from the front (left side in FIG. 9) wall surface of the guide portion 6a to the rear side.
In addition, the plurality of partition plates 6g and 6g arranged alternately are overlapped in a plan view.

As described above, the plurality of partition plates 6g and 6g are provided in the guide portion 6a of the inlet duct 6, and the plurality of partition plates 6g and 6g are alternately arranged, so that the openings 6c and the guide portions 6a are disposed. The oil mist that is about to enter together with the invading blow-by gas collides with the partition plates 6g and 6g and is removed while passing through the guide portion 6a. Further, by providing the partition plates 6g and 6g, it is possible to lengthen the path through which the blow-by gas passes inside the guide portion 6a.
Thereby, the intrusion of oil mist into the breather chamber 21 can be reduced, and the oil drainage performance of the inlet duct 6 can be improved.

Further, as shown in FIGS. 7 and 8, a valve arm support base 22 is arranged in the valve arm chamber 20, and the inlet duct 6 of the breather device is connected to the side walls of the valve arm support base 25 and the valve arm case 2. 2a.
As described above, the inlet duct 6 disposed between the valve arm support 25 and the side wall 2a has a rectangular sectional shape as shown in FIGS. If the gap between the arm support 25 and the side wall 2a cannot be made large, the cross-sectional area of the guide portion 6a (blow-by gas passage area) and the opening area of the opening 6c may not be large.

Therefore, in the inlet duct 6 shown in FIGS. 7 and 8, the left and right ends (upper and lower ends in FIG. 8) of the guide portion 6 a extend to the valve arm support base 25 side, and the outside of the valve arm support base 25. It is formed in a substantially “U” shape in plan view so as to surround the end (the right end in FIG. 7).
That is, the guide portion 6a includes a guide portion main body 6p formed in a square shape, and left and right extending portions 6q and 6r extending from the left and right end portions of the guide portion main body 6p to the valve arm indicating base 25 side. ing.

As described above, the guide portion 6a is constituted by the guide portion main body 6p and the left and right extending portions 6q and 6r, so that the guide portion 6a is formed only by the rectangular guide portion main body 6p. A large opening area of the opening 6c at the lower end can be secured.
Thereby, the flow speed of blow-by gas which penetrates into the guide part 6a from the opening part 6c can be slowed, and it becomes possible to improve the breather performance such as oil removal and oil transfer.

The breather device can also be configured as follows.
In the breather device shown in FIG. 10, the inlet duct 6 extends downward from the opening 5a of the shielding plate 5, and an oil trap material 11 is disposed in the opening 5a.
In the breather apparatus, a plurality of oil trap materials are provided in the breather chamber 20 in addition to the oil trap material 11 disposed in the opening 5a.

Specifically, a first breather chamber trap material 12 and a second breather chamber trap material 13 are provided in the breather chamber 20, and the first breather chamber trap material 12 is upstream of the second breather chamber trap material 13. Arranged on the side. Both trap materials 12 and 13 are constituted by a filter net, for example.
The first breather indoor trap material 12 has a finer mesh than the second breather indoor trap material 13. Further, the oil trap material 11 is configured to be coarser than the first breather indoor trap material 12.

In the breather device configured as described above, the blow-by gas in the valve arm chamber 20 enters the inlet duct 6 from the opening 6 c and enters the breather chamber 21 after passing through the oil trap material 11.
Since the oil trap material 11 is configured with coarse eyes so that the oil droplets formed by the oil mist adhering to the oil trap material 11 fall and return, the fine oil mist or gas contained in the blow-by gas is returned. The oil mist passes through the oil trap material 11 and enters the breather chamber 20.

However, fine oil mist and gaseous oil mist in the blow-by gas that has entered the breather chamber 20 are captured by the first breather chamber trap member 12 disposed upstream of the breather chamber 20.
The oil mist trapped by the first breather chamber trap material 12 and formed into oil droplets grows as the amount of the trapped oil increases and becomes large particles, travels downstream of the flow of blow-by gas, and is coarse. It is captured by the second breather indoor trap material 13. The oil droplets captured by the second breather chamber trap material 13 fall downward as in the case of the oil trap material 11.

Here, when the oil trap material provided in the breather device is the coarse oil trap material 11 and the second breather indoor trap material 13, the oil mist captured by the oil trap material 11 and the second breather indoor trap material 13 is Although it does not fall downward and is not discharged to the outside of the breather device, fine oil mist or gaseous oil mist passes through the oil trap material 11 and the second breather indoor trap material 13 and cannot be captured. The breather chamber 21 is discharged outside.
On the other hand, when the oil trap material provided in the breather device is the coarse oil trap material 11 and the fine first breather indoor trap material 12, fine oil mist or gaseous matter is generated by the first breather indoor trap material 12. Although the oil mist can be captured, the oil droplets of the captured oil mist grow and become large particles and are discharged out of the breather chamber 21.

However, in this breather apparatus, in addition to the oil trap material 11, the breather chamber 21 includes the first breather chamber trap material 12 with a fine mesh and the second breather chamber trap material 13 with a coarse mesh. Oil mist and gaseous oil mist can be captured by the first breather indoor trap material 12, and large oil particles in which the captured fine oil mist and gaseous oil mist have grown are trapped in the second breather indoor trap material. 13 and the amount of oil mist discharged to the outside of the breather chamber 21 can be reduced.
As a result, even when the engine is operated for a long time with the intake reduction specification, it is possible to reduce deposits caused by the lubricating oil adhering to the intake manifold, the intake valve, and the like.

In addition, in an engine with a large amount of blowby gas, such as an engine with a turbocharger, an oil draining mist is generally provided downstream of the breather chamber 21 in order to prevent oil droplets from dropping from a blowby hose connected downstream of the breather device. A separator is provided.
For example, a mist separator 30 as shown in FIG. 11 is provided on the downstream side of the breather chamber 21 of the breather apparatus shown in FIG.

The mist separator 30 is configured to partition the separation chamber 31 into an upstream chamber 31a and a downstream chamber 31b by a partition wall 32, and to separate the oil mist in the blowby gas by bending the path of the blowby gas entering from the gas inlet 33a. Has been.
The blow-by gas from which the oil mist has been separated is discharged from the gas outlet 33b and released to the atmosphere, and the separated oil mist is collected from the oil return passage 33c at the lower end of the separation chamber 31.
However, the mist separator 30 configured in this way has a simple structure in which the separation chamber 31 is partitioned by the partition wall 32, the path of the blow-by gas is bent, and the oil mist is separated by gravity. Oil mist is exhausted without being captured.

Therefore, in the present invention, as shown in FIG. 12, the first oil trap member 35 is provided in the upstream chamber 31a and the second oil trap member 36 is provided in the downstream chamber 31b of the mist separator 30, so I try to improve performance.
The first oil trap material 35 and the second oil trap material 36 are constituted by a filter net or the like, and the eyes of the first oil trap material 35 are finer than the eyes of the second oil trap material 36.

In the mist separator 30 configured as described above, the blow-by gas that has entered from the gas inlet 33a is not only finely sized but also finely sized by the first oil trap material 35 with a fine mesh while passing through the upstream chamber 31a. Even oil mist and gaseous oil mist are captured.
Even when the oil mist still remains in the blow-by gas that has passed through the first oil trap material 35, it is possible to supplement oil mistakes remaining due to the second oil trap material 36 in the downstream chamber 31b.

Therefore, the mist separator 30 shown in FIG. 12 reduces the amount of oil mist discharged from the gas outlet 33b and improves the oil draining performance compared with the conventional mist separator 30 shown in FIG. Yes. Thereby, oil droplet dripping from a blow-by hose can also be prevented.
Further, the separation of the oil mist from the blow-by gas is performed not only by gravity but mainly by capturing the oil mist by the first oil trap material 35 and the second oil trap material 36. The restriction on the installation posture can be reduced.
Furthermore, in a turbocharged engine, the conventional mist separator 30 has insufficient oil removal performance to perform intake air reduction, but it is configured like the mist separator 30 of the present invention shown in FIG. Thus, it is possible to ensure oil drainage performance for performing intake air reduction.

Note that the oil droplets captured by the first oil trap material 35 grow into large particles and easily fall because the first oil trap material 35 has fine eyes. Accordingly, the oil droplets captured by the first oil trap member 35 can be easily collected from the oil return passage 33c.
Further, the oil droplets captured by the second oil trap material 36 are not grown and discharged from the gas outlet 33b to the outside because the second oil trap material 36 is rough.

Further, the mist separator 30 provided with the first oil trap material 35 and the second oil trap material 36 may be configured as the mist separator 30 shown in FIG.
That is, the separate chamber 31 is configured as a single chamber without being partitioned by the partition wall 32, and the first oil trap material 35 and the second oil trap material 36 are arranged in series in the separate chamber 31, so that the mist separator 30 Configure.

Even when configured in this way, the amount of oil mist discharged from the gas outlet 33b can be reduced and the oil removal performance can be improved, as in the mist separator 30 shown in FIG. Thereby, oil droplet dripping from a low-by-hose can also be prevented.
Further, the separation of the oil mist from the blow-by gas is performed not only by gravity but mainly by capturing the oil mist by the first oil trap material 35 and the second oil trap material 36. The restriction on the installation posture can be reduced.
Furthermore, in a turbocharged engine, the conventional mist separator 30 has insufficient oil removal performance to perform intake air reduction, but it is configured like the mist separator 30 of the present invention shown in FIG. Thus, it is possible to ensure oil drainage performance for performing intake air reduction.

It is side surface sectional drawing which shows the valve arm case provided with the breather apparatus of this invention. It is side surface sectional drawing which shows the inlet duct of a breather apparatus. It is a bottom view which shows the inlet duct of a breather apparatus. It is side surface sectional drawing which shows the 2nd Example of an entrance duct. It is side surface sectional drawing which shows the 3rd Example of an entrance duct. It is a front view which shows the 3rd Example of an entrance duct. It is side surface sectional drawing which shows 4th Example of an entrance duct. It is a top view which shows the 4th Example of an entrance duct. It is side surface sectional drawing which shows 5th Example of an entrance duct. It is side surface sectional drawing which shows the breather apparatus which incorporated the mist separator in the breather chamber. It is side surface sectional drawing which shows the conventional mist separator. It is side surface sectional drawing which shows the mist separator with which the breather apparatus of this invention is provided. It is side surface sectional drawing which shows the 2nd Example of a mist separator.

Explanation of symbols

6 Inlet duct 6a Guide portion 6b Diagonal plate 6c Opening portion 11 Oil trap material 20 Valve arm chamber 21 Breather chamber

Claims (12)

In an engine breather device for removing oil mist in blow-by gas,
A baffle plate is provided at the lower end of the inlet duct that protrudes downward from the inlet portion of the breather chamber, and the baffle plate is constituted by a diagonal plate that extends obliquely downward from the lower end of the inlet duct. . In an engine breather device for removing oil mist in blow-by gas,
A baffle plate is provided at the lower end of the inlet duct that protrudes downward from the inlet portion of the breather chamber. The baffle plate extends obliquely downward from the lower end of the inlet duct, and extends horizontally from the lower end of the diagonal plate. A breather device comprising a horizontal plate. In an engine breather device for removing oil mist in blow-by gas,
A baffle plate is provided at the lower end of the inlet duct that protrudes downward from the inlet portion of the breather chamber, and the baffle plate is constituted by an oblique plate that extends obliquely downward from the lower end of the inlet duct.
A breather device characterized in that the lower end of the inlet duct is cut away from the side opposite to the base end side of the baffle plate. In an engine breather device for removing oil mist in blow-by gas,
A baffle plate is provided at the lower end of the inlet duct protruding downward from the inlet portion of the breather chamber, and the baffle plate extends obliquely downward from the lower end of the inlet duct, and extends horizontally from the lower end of the diagonal plate. A breather device comprising a horizontal plate and having a lower end of the inlet duct cut away from the side opposite to the base end side of the baffle plate.   The breather device according to any one of claims 1 to 4, wherein the baffle plate substantially closes the opening of the inlet duct in a bottom view.   The breather apparatus according to any one of claims 1 to 5, wherein the baffle plate is formed by extending and bending a forming member of an inlet duct downward.   The inlet duct is formed in a substantially rectangular tube shape, extends downward on one surface of the inlet duct and bends inward to form a baffle plate, and a surface facing the surface on which the baffle plate of the inlet duct is formed. The breather device according to claim 1, wherein the breather device is cut out. An engine breather device for removing oil mist in blowby gas, wherein an inlet duct is disposed between a valve arm cover side wall and a valve arm support in the valve arm cover.
A breather apparatus characterized in that both ends of the inlet duct are extended toward the valve arm support base so as to surround the end of the valve arm support base and are formed in a substantially “U” shape in plan view. In an engine breather device for removing oil mist in blow-by gas,
A breather apparatus, wherein a plurality of partition plates are provided inside an inlet duct of a breather chamber, and the plurality of partition plates are alternately arranged. In an engine breather device for removing oil mist in blow-by gas,
A plurality of oil trap materials are arranged in the breather chamber, and the eyes of the oil trap materials located upstream in the blow-by gas flow direction are configured more finely than the eyes of the oil trap materials located downstream. Breather device. An engine breather device for removing oil mist in blow-by gas, wherein a mist separator is disposed downstream of the breather chamber.
A breather comprising a plurality of oil trap materials in a mist separator, wherein the oil trap material located upstream in the blow-by gas flow direction is made finer than the oil trap material located downstream. apparatus. An engine breather device for removing oil mist in blow-by gas, in which a mist separator is disposed downstream of the breather chamber,
In the mist separator, a partition plate that partitions the space in the mist separator into an upstream space and a downstream space is provided,
An oil trap material is provided in each of the upstream space and the downstream space,
A breather device characterized in that the oil trap material provided in the upstream space is finer than the oil trap material provided in the downstream space.

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