JP2021001561A - Blow-by gas treatment device - Google Patents

Abstract

To suppress contamination by an oil released to the atmospheric air.SOLUTION: A blow-by gas treatment device includes an oil separator 60 disposed at an outlet portion of a blow-by gas passage 32 for releasing a blow-by gas BBY of an internal combustion engine to the atmospheric air. The oil separator includes: an inner pipe 61 to which the blow-by gas is introduced, and which is vertically extended and opened at a lower end 63; an outer container 62 for housing a part including a lower end of the inner pipe; a gas outlet 66 formed on a position higher than the lower end of the inner pipe, of the outer container, and opened to the atmospheric air; and a hole 67 formed on a position higher than the lower end and lower than the gas outlet, of the inner pipe.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to an apparatus for processing blow-by gas of an internal combustion engine.

In an internal combustion engine, a blow-by gas treatment device is known in which blow-by gas leaking into a crankcase from a gap between a piston and a cylinder is allowed to flow through a blow-by gas passage and then released to the atmosphere from the outlet.

JP-A-2002-97919

With such a configuration in which the blow-by gas is released to the atmosphere, the oil contained in the blow-by gas is also released to the atmosphere together with the blow-by gas. As a result, there is a problem that the oil released to the atmosphere pollutes the area around the outlet.

Therefore, the present disclosure was devised in view of such circumstances, and an object of the present disclosure is to provide a blow-by gas treatment device capable of suppressing pollution by oil released to the atmosphere.

According to one aspect of the present disclosure
Equipped with an oil separator provided at the outlet of the blow-by gas passage that releases the blow-by gas of the internal combustion engine to the atmosphere.
The oil separator
An inner tube with blow-by gas introduced, extending vertically and having an open bottom,
An outer container that houses a portion of the inner tube that includes the lower end,
In the outer container, a gas outlet provided at a position higher than the lower end of the inner pipe and open to the atmosphere, and
In the inner pipe, a hole provided at a position higher than the lower end and lower than the gas outlet,
A blow-by gas processing apparatus is provided, which comprises the above.

Preferably, the oil separator comprises an oil discharge pipe provided at the bottom of the outer container.

Preferably, the oil separator comprises a check valve provided in the oil discharge pipe, the outlet of the oil discharge pipe is connected to the engine body, and the check valve responds to the internal pressure of the engine body. Open and close.

Preferably, the oil separator comprises a drain valve provided in the oil discharge pipe.

Preferably, the oil separator includes a partition plate that vertically partitions the inside of the outer container at a position higher than the hole and lower than the gas outlet, and a hole provided in the partition plate.

According to the present disclosure, pollution caused by oil released to the atmosphere can be suppressed.

It is a schematic plan view of an internal combustion engine including a blow-by gas processing apparatus. It is a schematic vertical sectional view of the upstream side oil separator. It is a schematic vertical sectional view of the downstream side oil separator. It is a schematic vertical sectional view of the downstream side oil separator which concerns on a modification.

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be noted that the present disclosure is not limited to the following embodiments.

FIG. 1 is a schematic plan view of an internal combustion engine (engine) 1 including a blow-by gas processing device 90. In the figure, the white arrows indicate the flow of the intake air A and the boost gas BST (described later), the shaded arrows indicate the flow of the blow-by gas BBY, and the black arrows indicate the flow of the exhaust EXH.

As shown in FIG. 1, the internal combustion engine (engine) 1 is a multi-cylinder compression ignition type internal combustion engine, that is, a diesel engine mounted on a vehicle (not shown). The vehicle is a large vehicle such as a truck. However, the type, type, application, etc. of the vehicle and the internal combustion engine 1 are not particularly limited. For example, the vehicle may be a small vehicle such as a passenger car, and the internal combustion engine 1 is a spark ignition type internal combustion engine, that is, a gasoline engine. May be good.

The engine may be mounted on a moving body other than a vehicle, for example, a ship, a construction machine, or an industrial machine. Further, the engine does not have to be mounted on a moving body, and may be a stationary engine.

The engine 1 includes an engine main body 2 and an intake passage 10 and an exhaust passage 11 connected to the engine main body 2. The engine body 2 includes structural parts such as a cylinder head, a cylinder block, and a crankcase, and movable parts such as a piston, a crankshaft, and a valve housed therein. Reference numeral 3 represents a head cover attached to the upper part of the cylinder head.

The intake passage 10 is mainly defined by an intake manifold 12 connected to the engine body 2 (particularly a cylinder head) and an intake pipe 13 connected to the upstream end of the intake manifold 12. The intake pipe 13 is provided with an air cleaner 14, a turbocharger 20 compressor 20C, and an intercooler 21 in this order from the upstream side.

Here, the air introduced from the air cleaner 14 into the intake pipe 13 and before being supercharged by the compressor 20C is referred to as intake air A, and the air after being supercharged by the compressor 20C is referred to as boost gas BST.

The exhaust passage 11 is mainly defined by an exhaust manifold 15 connected to the engine body 2 (particularly a cylinder head) and an exhaust pipe 16 arranged on the downstream side of the exhaust manifold 15. A turbine 20T of the turbocharger 20 is provided between the exhaust manifold 15 and the exhaust pipe 16.

The engine 1 includes an exhaust gas recirculation (EGR (Exhaust Gas Recirculation)) device 4. The EGR device 4 includes an EGR passage 5 for recirculating a part of the exhaust gas (referred to as EGR gas) in the exhaust passage 11 (particularly in the exhaust manifold 15) into the intake passage 10 (particularly in the intake manifold 12), and an EGR passage. An EGR cooler 6 for cooling the EGR gas flowing through the No. 5 and an EGR valve 7 for adjusting the flow rate of the EGR gas are provided.

The blow-by gas processing device 90 includes a blow-by gas passage 30 for flowing blow-by gas and finally opening it to the atmosphere. As is well known, blow-by gas is gas that leaks into the crankcase from the gap between the cylinder and the piston in the engine body 2. The blow-by gas passage 30 is provided with two oil separators 40 and 60 in order to separate oil from the blow-by gas. One oil separator 40 is a main oil separator provided in the middle portion of the blow-by gas passage 30. On the other hand, the other oil separator 60 is an auxiliary oil separator provided at the outlet of the blow-by gas passage 30, and separates the oil from the blow-by gas immediately before the blow-by gas is released to the atmosphere. Hereinafter, the former is referred to as an upstream oil separator 40, and the latter is referred to as a downstream oil separator 60. The upstream oil separator 40 of the present embodiment is configured to separate oil from blow-by gas by using compressed air, that is, boost gas generated by the compressor 20C, as will be described later.

The upstream oil separator 40 may have a normal configuration that does not use boost gas. If possible, the upstream oil separator 40 may be omitted.

The blow-by gas passage 30 is arranged on the downstream side of the gas passage 31 in the engine body 2 extending from the inside of the crankcase through the cylinder block and the cylinder head into the head cover 3, and is exposed to the outside. It is formed by a blow-by gas pipe 32. The upstream oil separator 40 is exposed to the outside and is arranged on the head cover 3. The downstream end of the gas passage 31 and the upstream end of the blow-by gas pipe 32 are connected to the upstream oil separator 40. That is, the upstream oil separator 40 is provided between the gas passage 31 and the blow-by gas pipe 32. A downstream oil separator 60 is connected to the downstream end of the blow-by gas pipe 32.

The blow-by gas processing device 90 includes a boost gas passage 50 that takes out the boost gas BST from the intake passage 10 on the downstream side of the compressor 20C and supplies it to the oil separator 40 on the upstream side. The boost gas passage 50 is defined by the boost gas pipe 51. In the case of the present embodiment, the upstream end of the boost gas passage 50 is connected to the intake pipe 13 on the upstream side of the intercooler 21, and the boost gas BST before being cooled by the intercooler 21 is taken out. The downstream end of the boost gas passage 50 is connected to the upstream oil separator 40.

FIG. 2 is a schematic vertical sectional view of the upstream oil separator 40. As shown in the figure, the upstream oil separator 40 is installed on the upper surface of the head cover 3. A gas outlet 31a of a gas passage 31 on the engine body side is formed on the upper surface of the head cover 3.

The upstream oil separator 40 includes an oil separating unit 41 that introduces blow-by gas BBY from the gas outlet 31a and separates oil O from the blow-by gas BBY. Further, the upstream oil separator 40 generates a negative pressure by the boost gas BST supplied to the upstream oil separator 40, and the gas that sucks the blow-by gas BBY after the oil O is separated by the oil separation unit 41 by the negative pressure. A suction unit 42 is provided. Further, the upstream oil separator 40 includes a gas discharge unit 43 that discharges the blow-by gas BBY sucked by the gas suction unit 42 together with the boost gas BST.

The oil separating portion 41 includes a lower casing 44 connected to the upper surface portion of the head cover 3, an upper casing 45 connected to the upper surface portion of the lower casing 44, a gas injection member 46, and an outlet casing 47.

The lower casing 44 covers the gas outlet 31a and has a communication port 44a, and a bottomed cylindrical gas injection member 46 is attached coaxially with the communication port 44a. As a result, the lower casing 44 communicates the gas outlet 31a with the gas injection member 46. The lower casing 44 is formed with an oil outlet 48 for discharging the oil O accumulated at the bottom of the outlet casing 47. A discharge valve 49, which will be described later, is attached to the oil outlet 48.

The upper casing 45 covers and accommodates the gas injection member 46 from above. At the lower end position of the upper casing 45, a discharge port 45a for discharging the blow-by gas BBY and the oil O after oil separation into the outlet casing 47 is formed.

The gas injection member 46 is formed in a bottomed cylindrical shape extending in the vertical direction and having an open lower end, and has a lid 46a at the upper end. Further, a plurality of through holes 46b extending in the radial direction are formed on the peripheral surface portion of the gas injection member 46.

The outlet casing 47 is formed in a gutter shape extending in the vertical direction, covers the discharge port 45a, and is connected to the side surface of the upper casing 45. A gas outlet 41a is formed at the upper end of the outlet casing 47. The gas outlet 41a serves as an outlet for the blow-by gas BBY in the oil separation unit 41.

The discharge valve 49 is always closed by the urging force of a spring (not shown). When oil O accumulates in the outlet casing 47 more than a certain amount, the valve is opened against the spring urging force by the load of the accumulated oil O. At this time, the oil O discharged from the oil outlet 48 is finally returned to the engine body 2 through an oil return pipe (not shown).

The gas suction portion 42 is formed in a tubular shape extending in the horizontal direction, and is supported on the upper casing 45 and the outlet casing 47. The downstream end of the boost gas pipe 51 is connected to the upstream end of the gas suction portion 42.

A small-diameter orifice 42a serving as a throttle is formed at the upstream end of the gas suction portion 42. On the other hand, at the downstream end of the gas suction portion 42, a tapered portion 42b whose diameter is gradually increased toward the downstream is formed, and a gas discharge portion 43 is integrally formed at the downstream end thereof. The upstream end of the blow-by gas pipe 32 is connected to the gas discharge unit 43.

The gas outlet 41a described above is provided so as to face or be orthogonal to the position of the outlet of the orifice 42a. As a result, a negative pressure is generated by the flow of the high-speed boost gas BST ejected from the orifice 42a, and the blow-by gas BBY after oil separation is sucked by this negative pressure and discharged from the gas outlet 41a. The blow-by gas BBY discharged from the gas outlet 41a flows in the gas suction unit 42 together with the boost gas BST, and is discharged from the gas discharge unit 43 into the blow-by gas pipe 32. As described above, the upstream oil separator 40 of the present embodiment separates the oil O from the blow-by gas BBY by utilizing the negative pressure generated by the boost gas BST.

Due to the suction of the blow-by gas BBY, the flow of the blow-by gas BBY as shown in FIG. 2 is generated in the upstream oil separator 40.

The blow-by gas BBY before oil separation introduced into the gas injection member 46 from the gas outlet 31a through the lower casing 44 is injected radially outward through the through hole 46b of the gas injection member 46 and collides with the inner wall of the upper casing 45. .. At this time, the oil O contained in the blow-by gas BBY adheres to the inner wall of the upper casing 45, and the oil O is separated from the blow-by gas BBY.

After the oil is separated, the blow-by gas BBY passes through the discharge port 45a and the outlet casing 47, and is sucked into the gas suction portion 42 from the gas outlet 41a as described above. On the other hand, the separated oil O enters the outlet casing 47 through the discharge port 45a and is stored there. When the accumulated oil O reaches a certain amount, the discharge valve 49 is opened and the oil O is discharged from the oil outlet 48.

Next, the downstream oil separator 60 will be described. FIG. 3 is a schematic vertical sectional view of the downstream oil separator 60.

As shown, the downstream oil separator 60 includes an inner pipe 61 and an outer container 62. The inner pipe 61 is a pipe that extends in the vertical direction and has an open lower end 63, into which blow-by gas is introduced. The outer container 62 accommodates a portion having a predetermined length L including the lower end 63 of the inner pipe 61.

More specifically, the inner tube 61 is a tube having a circular cross section. The upper end 59 of the inner pipe 61 projects upward from the outer container 62 and is bent in the horizontal direction, and the downstream end of the blow-by gas pipe 32 is connected to the upper end 59. As a result, the blow-by gas BBY and the boost gas BST that have flowed through the blow-by gas pipe 32 are introduced into the inner pipe 61 from the upper end portion 59, and flow in the inner pipe 61 in the longitudinal direction toward the lower end 63 of the inner pipe 61. Is done.

For convenience, in the following description, it is assumed that only the blow-by gas BBY flows in the downstream oil separator 60, and the boost gas BST is ignored.

The outer container 62 is formed of a tube having a circular cross section that extends in the vertical direction and is arranged coaxially with the inner tube 61. As a result, the downstream oil separator 60 has a double pipe structure. The outer container 62 naturally has a larger diameter than the inner tube 61. The upper end and the lower end of the outer container 62 are closed by the ceiling portion 64 and the bottom portion 65, respectively. The inner pipe 61 is fixed through the ceiling portion 64.

Further, the downstream oil separator 60 includes a gas outlet 66 provided in the outer container 62 and a hole provided in the inner pipe 61, that is, a gas passage hole 67.

The gas outlet 66 is opened to the atmosphere and serves as an outlet for opening the blow-by gas BBY to the atmosphere. The gas outlet 66 is bent downward in the middle thereof, and its outlet end 69 is directed downward. The gas outlet 66 is provided at a position higher than the lower end 63 of the inner pipe 61. That is, the inlet end 70 of the gas outlet 66 is located higher than the lower end 63 of the inner pipe 61.

The gas passage hole 67 is a through hole for discharging the blow-by gas BBY from the inside pipe 61 at a portion other than the lower end 63. A plurality of gas passage holes 67 of the present embodiment are provided, and are provided in an appropriate arrangement such as a staggered shape or a grid shape over a predetermined length range of the inner pipe 61.

The gas passage hole 67 is provided at a position higher than the lower end 63 and lower than the gas outlet 66. More specifically, all the gas passage holes 67 are provided at positions higher than the lower end 63 and lower than the inlet end 70 of the gas outlet 66.

Further, the downstream side oil separator 60 includes an oil discharge pipe 71 provided at the bottom 65 of the outer container 62 and a check valve 72 provided at the oil discharge pipe 71.

The oil discharge pipe 71 is a pipe for discharging the oil O accumulated in the outer container 62. The outlet 73 of the oil discharge pipe 71 is connected to the connecting pipe 74, and is indirectly connected to the engine body 2, specifically the crankcase, via the connecting pipe 74. Then, the oil O accumulated in the outer container 62 can be returned to the inside of the crankcase through the oil discharge pipe 71 and the connecting pipe 74.

The check valve 72 is configured to allow the flow of oil from the outer container 62 toward the crankcase (discharge direction) and prohibit the flow of oil in the reverse direction. The check valve 72 opens and closes according to the internal pressure of the crankcase. That is, when the internal pressure of the crankcase is lower than the predetermined valve closing pressure as when the engine is stopped, the check valve 72 is opened and the oil is allowed to be discharged from the outer container 62. The symbol a indicates the position of the valve body 75 at this time. On the contrary, when the internal pressure of the crankcase is equal to or higher than the predetermined closing pressure as in the case of engine operation, the check valve 72 is closed and the discharge of oil from the outer container 62 is prohibited. Reference numeral b indicates the position of the valve body 75 at this time.

Further, the downstream oil separator 60 includes a partition plate 76 for vertically partitioning the inside of the outer container 62, and a hole provided in the partition plate 76, that is, a communication hole 77.

The partition plate 76 is an annular plate that closes the radial gap between the inner pipe 61 and the outer container 62. The partition plate 76 is located higher than the gas passage hole 67 and lower than the gas outlet 66. Specifically, the partition plate 76 is located higher than the gas passage hole 67 at the highest position and lower than the inlet end 70 of the gas outlet 66.

The communication holes 77 are through holes for communicating the upper and lower spaces partitioned by the partition plate 76, and a plurality of communication holes 77 are provided in the circumferential direction of the partition plate 76.

Next, the action and effect of this embodiment will be described.

As shown by the arrows in the figure, the blow-by gas BBY introduced from the blow-by gas pipe 32 into the inner pipe 61 flows through the inner pipe 61 and is discharged from the lower end 63 and the plurality of gas passage holes 67. The discharged blow-by gas BBY is introduced into the space 78 below the partition plate 76 in the outer container 62. The blow-by gas BBY rises and passes through a plurality of communication holes 77 of the partition plate 76, and is introduced into the space 79 above the partition plate 76 in the outer container 62. The inlet end 70 of the gas outlet 66 is open in the upper space 79. Therefore, the blow-by gas BBY in the upper space 79 is introduced into the gas outlet 66, and is opened or discharged to the atmosphere from the outlet end 69. The outlet end 69 of the gas outlet 66 is located at a position slightly higher than the partition plate 76 in the present embodiment.

When it is desired to open the blow-by gas BBY to the atmosphere at a lower position or a different position, a hose may be connected to the outlet end 69 of the gas outlet 66, and the outlet end of the hose may be arranged at a desired position.

In the process in which the blow-by gas BBY flows in the downstream oil separator 60 in this way, the oil O is separated from the blow-by gas BBY. That is, although most of the oil O originally contained in the blow-by gas BBY is removed by the upstream oil separator 40, the blow-by gas BBY containing the oil O that cannot be completely removed by the upstream oil separator 40 is downstream. It is introduced into the side oil separator 60. The downstream oil separator 60 separates and removes a relatively small amount of oil contained in the blow-by gas BBY immediately before opening to the atmosphere.

For example, when the blow-by gas BBY discharged from the lower end 63 of the inner pipe 61 collides with the bottom 65 of the outer container 62 or the stored oil O, the oil O contained in the blow-by gas BBY adheres to the bottom 65 or the stored oil O. Separated from blow-by gas BBY. Further, when the blow-by gas BBY discharged from the gas passage hole 67 of the inner pipe 61 collides with the outer peripheral portion 68 of the outer container 62, the oil O contained in the blow-by gas BBY adheres to the outer peripheral portion 68, and the blow-by gas BBY Be separated. When the rising blow-by gas BBY collides with the partition plate 76 and passes through the communication hole 77, the oil O contained in the blow-by gas BBY adheres to the partition plate 76 and is separated from the blow-by gas BBY.

Therefore, the blow-by gas BBY after sufficiently removing the oil O can be opened to the atmosphere from the gas outlet 66. Therefore, it is possible to reduce the amount of oil released to the atmosphere from the gas outlet 66 together with the blow-by gas BBY, and it is possible to reliably prevent the oil from contaminating the vicinity of the gas outlet 66.

The separated oil O is stored on the bottom 65 of the outer container 62 as shown by a virtual line in the figure. When the internal pressure of the crankcase is equal to or higher than a predetermined valve closing pressure, such as when the engine is running, the check valve 72 is closed. Therefore, during that time, the separated oil O is continuously accumulated.

On the other hand, when the internal pressure of the crankcase becomes lower than the valve closing pressure, such as when the engine is stopped, the check valve 72 is opened. Therefore, the accumulated oil O is returned to the inside of the crankcase through the oil discharge pipe 71.

In this way, the accumulated oil O can be automatically and periodically returned to the crankcase, which is convenient.

According to this embodiment, the gas passage hole 67 is provided at a position higher than the lower end 63 of the inner pipe 61. Therefore, even if the lower end 63 of the inner pipe 61 is blocked by the accumulated oil O due to some trouble or the like, the blow-by gas BBY can be discharged from the inner pipe 61 through the gas passage hole 67. Therefore, the blow-by gas BBY can be opened to the atmosphere without any trouble.

If there is no gas passage hole 67 and the lower end 63 of the inner pipe 61 is closed, the blow-by gas BBY cannot be discharged from the inner pipe 61, so that the internal pressure of the crankcase may rise excessively. According to this embodiment, such a problem can be solved.

Further, the gas passage hole 67 is provided at a position lower than the gas outlet 66 (specifically, the inlet end 70). Therefore, the blow-by gas BBY discharged from the gas passage hole 67 once rises and enters the gas outlet 66. Therefore, the oil O can be separated by its own weight during the ascent, and the oil separation can be promoted. Then, it is possible to prevent the blow-by gas BBY having a high oil concentration from being released to the atmosphere from the gas outlet 66.

Further, the partition plate 76 is provided at a position higher than the gas passage hole 67 and lower than the gas outlet 66. Therefore, the blow-by gas BBY rising from the gas passage hole 67 toward the gas outlet 66 can collide with the partition plate 76 to promote oil separation. Since the partition plate 76 is provided with a plurality of communication holes 77, the partition plate 76 can be passed by the blow-by gas BBY without any trouble.

Further, since the downstream oil separator 60 having a double pipe structure is provided, it is possible to suppress freezing of water contained in the blow-by gas BBY and passage blockage caused by the freezing. That is, if the downstream oil separator 60 is not provided and the downstream end of the blow-by gas pipe 32 is directly open to the atmosphere, the moisture in the blow-by gas located inside the downstream end is the outside air. It is cooled directly by and easily freezes. Then, this freezing may proceed, and the inside of the downstream end may be blocked.

However, according to the present embodiment, since the outlet of the inner pipe 61 (lower end 63 and gas passage hole 67) is located inside the outer container 62, the outlet is not directly exposed to the outside air. Therefore, freezing of water inside the outlet can be suppressed. Further, since the water content is also separated and removed before the blow-by gas discharged from the inner pipe 61 enters the gas outlet 66, freezing inside the outlet end 69 of the gas outlet 66 can be suppressed. Therefore, the above problem can be solved.

Next, a modified example will be described. The same parts as those of the above-mentioned basic embodiment are designated by the same reference numerals in the drawings, and the description thereof will be omitted. Hereinafter, the differences from the basic embodiment will be mainly described.

As shown in FIG. 4, in this modification, a drain valve 80 is provided in the oil discharge pipe 71 instead of the check valve 72 described above. The drain valve 80 of this modification is a manual type. The user manually opens the drain valve 80 to drain the oil accumulated in the outer container 62. Then, after discharging, the user manually returns the drain valve 80 to the closed state.

Preferably, the outer container 62 is provided with a transparent window 81 so that the oil in the outer container 62 can be visually confirmed from the outside. The user confirms the amount of oil stored in the outer container 62 through the window 81, and opens the drain valve 80 when the amount of oil stored exceeds a predetermined amount. The window 81 preferably has a shape extending in the vertical direction as shown in the figure. The window 81 of the illustrated example extends from the vicinity of the bottom 65 of the outer container 62 to the vicinity of the highest gas passage hole 67. For the same purpose, the outer container 62 itself may be a transparent container.

Alternatively, the drain valve 80 may be configured with a solenoid valve. Then, the oil storage amount in the outer container 62 may be detected by a sensor, and the drain valve 80 may be controlled to open when the oil storage amount exceeds a predetermined amount.

Further, the outlet of the oil discharge pipe 71 may be opened to the atmosphere, and the oil discharged from the oil discharge pipe 71 when the manual drain valve 80 is opened may be collected in another container.

Although the embodiments of the present disclosure have been described in detail above, various other embodiments and modifications of the present disclosure can be considered.

(1) For example, only one gas passage hole 67 may be provided instead of a plurality of gas passage holes 67. Similarly, only one communication hole 77 may be provided.

(2) The inner pipe 61 may be connected to the blow-by gas pipe 32 via an appropriate pipe joint. Similarly, the oil discharge pipe 71 may be connected to the connecting pipe 74 via a suitable pipe fitting.

The embodiments of the present disclosure are not limited to the above-described embodiments, and all modifications, applications, and equivalents included in the ideas of the present disclosure defined by the scope of claims are included in the present disclosure. Therefore, this disclosure should not be construed in a limited way and can be applied to any other technique that belongs within the scope of the ideas of this disclosure.

1 Internal combustion engine 2 Engine body 32 Blow-by gas pipe 40 Upstream oil separator 60 Downstream oil separator 61 Inner pipe 62 Outer container 63 Lower end 65 Bottom 66 Gas outlet 67 Gas passage hole 71 Oil discharge pipe 72 Check valve 73 Outlet 76 Partition plate 77 Communication hole 80 Drain valve 90 Blow-by gas treatment device

Claims (5)

Equipped with an oil separator provided at the outlet of the blow-by gas passage that releases the blow-by gas of the internal combustion engine to the atmosphere.
The oil separator
An inner tube with blow-by gas introduced, extending vertically and having an open bottom,
An outer container that houses a portion of the inner tube that includes the lower end,
In the outer container, a gas outlet provided at a position higher than the lower end of the inner pipe and open to the atmosphere, and
In the inner pipe, a hole provided at a position higher than the lower end and lower than the gas outlet,
A blow-by gas treatment device characterized by being equipped with. The blow-by gas treatment device according to claim 1, wherein the oil separator includes an oil discharge pipe provided at the bottom of the outer container. The oil separator includes a check valve provided in the oil discharge pipe, the outlet of the oil discharge pipe is connected to the engine body, and the check valve opens and closes according to the internal pressure of the engine body. Item 2. The blow-by gas treatment apparatus according to Item 2. The blow-by gas treatment device according to claim 2, wherein the oil separator includes a drain valve provided in the oil discharge pipe. Any one of claims 1 to 4, wherein the oil separator includes a partition plate that vertically partitions the inside of the outer container at a position higher than the hole and lower than the gas outlet, and a hole provided in the partition plate. The blow-by gas treatment apparatus according to paragraph 1.

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