JP2007309257A - Blowby gas treatment device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blowby gas treatment device having a structure for separating oil from blowby gas. <P>SOLUTION: This blowby gas treatment device for an internal combustion engine having a turbocharger 10A is provided with a first communication passage for flowing blowby gas BG generated in the internal combustion engine to a compressor side along a rotating main shaft 15 of the turbocharger 10A. An oil separating means 20RP for separating oil components from the blowby gas BG inside the turbocharger 10A is provided on the first communication passage. By the oil separating means 20RP arranged inside the turbocharger 10A, oil components are separated. Due to this configuration, even when the blowby gas BG is circulated in the compressor side, the oil components are removed. Therefore, even when the blowby gas BG is mixed with intake air and burned, deterioration of emission can be prevented and reduction of oil can be suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an apparatus for processing blow-by gas generated in accordance with driving of an internal combustion engine. In particular, the present invention relates to a blow-by gas processing device for an internal combustion engine with a turbocharger (supercharger).

  There is a minute gap between a cylinder formed in the block of the internal combustion engine and a piston arranged inside the cylinder. For this reason, the combustion gas on the combustion chamber side may leak to the crankcase side through the gap while the internal combustion engine repeatedly performs the compression and explosion strokes. Such gas leaking into the crankcase is generally referred to as blow-by gas. Since the combustion gas contains an acidic water vapor component, the engine oil in the oil pan disposed at the lower part of the crankcase is deteriorated if the blow-by gas is left unattended. Furthermore, since a mist or gaseous oil component (hereinafter referred to as oil mist) is floating in the crankcase, the blow-by gas that has entered here is in a state containing the oil component.

  The blow-by gas in the crankcase not only causes deterioration of the oil as described above, but also causes corrosion and oil leakage inside the internal combustion engine, so it needs to be treated. However, if this blow-by gas is released into the atmosphere, it causes pollution, and therefore, an internal combustion engine in recent years has a device for processing blow-by gas. For example, Patent Document 1 discloses a blow-by gas processing device for a diesel engine. The blow-by gas processing device disclosed here has a venturi pipe arranged in the middle of an intake pipe (flow pipe) connecting the intake manifold from the downstream of the compressor side of the turbocharger, and this venturi pipe is connected to the crankcase by piping. Yes. When intake air flows into the intake pipe, a low static pressure (negative pressure) is generated in the venturi pipe, and blow-by gas in the crankcase is sucked out to the intake pipe side. The blow-by gas sucked out to the intake pipe side is mixed with the intake air and burned in the combustion chamber.

JP-A-8-270509

  However, in the blow-by gas processing apparatus of Patent Document 1, blow-by gas containing engine oil (hereinafter simply referred to as oil) is combusted, so there is a concern about deterioration of exhaust emission and the oil is combusted. Therefore, it is necessary to consider replenishing regularly. For an internal combustion engine equipped with a turbocharger, it is conceivable to circulate blow-by gas in a low pressure portion upstream of the compressor. However, if such a structure is adopted, the temperature near the turbocharger compressor becomes high, and oil gradually adheres and accumulates. As a result, there arises a problem that the performance of the turbocharger is lowered. It is also conceivable to remove oil mist in the blow-by gas using a filter before introduction into the compressor. However, if the amount of trapping by the filter is increased, the pressure loss increases, and it is difficult to remove the oil mist.

  The present invention has been made to solve the conventional problems described above, and provides a blow-by gas processing apparatus having a structure for separating oil from blow-by gas.

  An object of the present invention is a blow-by gas processing apparatus for an internal combustion engine equipped with a turbocharger, comprising a first communication passage for flowing blow-by gas generated in the internal combustion engine to a compressor side along a rotation main shaft of the turbocharger. The first communication passage is achieved by a blow-by gas processing apparatus for an internal combustion engine provided with an oil separation means for separating an oil component from the blow-by gas in the turbocharger.

  According to the present invention, the oil component is separated by the oil separation means provided in the turbocharger in the process in which the blow-by gas flows to the compressor side of the turbocharger through the first communication path. Therefore, even if the blow-by gas is circulated to the compressor side, the oil component is removed. Therefore, even if the blow-by gas is mixed with the intake air and combusted, the emission is not deteriorated and the decrease in oil can be suppressed. Furthermore, it is possible to suppress the occurrence of a problem that the performance of the turbocharger is deteriorated due to oil adhesion and accumulation.

  The first communication path includes a blow-by gas supply path for supplying the blow-by gas to the bearing chamber of the turbocharger, and a blow-by gas circulation for flowing the blow-by gas from the bearing chamber to the compressor side along the rotation main shaft. And the oil separation means is provided in the blow-by gas circulation path.

  The blow-by gas circulation path includes a main passage provided along the axis inside the rotation main shaft and a gas introduction passage provided radially from the main passage, and the gas is rotated when the rotation main shaft rotates. The introduction passage may serve as the oil separation means. A main passage and a gas introduction passage are formed in the rotation main shaft, and oil can be separated by the gas introduction passage when rotating, so that the oil content in the blow-by gas can be removed while reducing the size and simplification of the peripheral configuration.

  The turbocharger further includes an oil slinger that engages with the rotation main shaft and rotates integrally to prevent the oil in the bearing chamber from flowing out to the outside, and the blow-by gas circulation path includes an axis of the rotation main shaft. A main passage provided between the rotating shaft and the oil slinger and the compressor wheel along with a gas introduction passage provided radially from the main passage to the oil slinger, and when the rotating main shaft rotates. The gas introduction passage may be the oil separation means. In this case, a main passage is provided between the oil slinger and the compressor wheel assembled to the rotating main shaft, and oil separation is performed by the gas introduction passage when the oil slinger is rotated by forming a gas introduction passage. Therefore, the oil content in the blow-by gas can be removed while making the peripheral configuration small and simple without subjecting the rotating main shaft of the turbocharger to difficult processing.

  Moreover, it is good also as a structure which provided the gas outlet passage by the side of the compressor of the said blowby gas radially. When such a structure is adopted, the blow-by gas is in a state orthogonal to the intake air, so that interference with the intake air can be prevented. Therefore, the blow-by gas easily flows out to the compressor side.

  The second communication path further includes a second communication path that is branched from the first communication path and circulates the blow-by gas to the compressor upstream side of the turbocharger via a mist separator. It is more preferable to employ a structure in which a valve device whose opening degree is adjusted according to the operating state of the internal combustion engine is provided. By adopting such a structure, blow-by gas can be reliably processed according to the operating state of the internal combustion engine.

  ADVANTAGE OF THE INVENTION According to this invention, the blowby gas processing apparatus provided with the structure which isolate | separates oil from blowby gas can be provided.

  Embodiments according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram schematically illustrating a configuration of an internal combustion engine 1A including a blow-by gas processing apparatus according to a first embodiment. An intake pipe 3 is connected to the intake side of the internal combustion engine body (hereinafter referred to as the engine 2), and an exhaust pipe 4 is connected to the exhaust side. The intake pipe 3 is provided with an air cleaner 5 and an intercooler 6 from the upstream side. Therefore, the intake air (atmosphere) SA introduced into the intake pipe 3 is supplied to the combustion chamber via the intake manifold TM connected to the engine 2 via the air cleaner 5 and the intercooler 6. The exhaust pipe 4 is provided with an exhaust purification device (or catalytic converter) 7. Therefore, the exhaust gas EG flowing out from the exhaust manifold EM to the exhaust pipe 4 is purified and then discharged outside the apparatus.

  The internal combustion engine 1A includes a turbocharger 10A. The compressor portion 11 of the turbocharger 10A is disposed so as to face the intake pipe 3, and the turbine portion 12 is disposed so as to face the exhaust pipe 4. The structure described so far is almost the same as that of a conventional turbocharged internal combustion engine.

  Hereinafter, the blow-by gas processing apparatus incorporated in the internal combustion engine 1A will be described. A blow-by gas supply passage 9 for taking out blow-by gas BG generated inside is connected to the head cover 8 above the engine 2. The blow-by gas supply path 9 is connected to a bearing chamber of a turbocharger 10A described in detail later. The blow-by gas BG introduced into the bearing chamber is flowed along the rotation main shaft (shaft) of the turbocharger after the oil mist is removed, and is mixed (merged) with the intake air SA on the compressor unit 11 side to the intake manifold TM. Supplied. A structure for separating and removing oil mistakes will be described below with reference to FIG.

  FIG. 2 is an enlarged view of the turbocharger 10A shown in FIG. Although FIG. 1 schematically shows the turbocharger 10A, FIG. 2 shows each part in the turbocharger 10A so that it can be confirmed.

  The turbocharger 10 </ b> A has a predetermined space called a bearing chamber formed in the housing 13. The rotation main shaft 15 is accommodated in the bearing chamber 14 in a horizontal state. One end of the rotation main shaft 15 extends to the compressor unit 11 side, and a compressor wheel 16 having compressor blades is fixed to the end thereof. Further, the other end of the rotary main shaft 15 extends to the turbine section 12 side, and a turbine wheel 17 having turbine blades is fixed to the end section. The structure so far is the same as that of the conventional turbocharger, but a new structure for separating oil mist in the blow-by gas BG is incorporated in the turbocharger 10A.

  A through passage 13PA penetrating to the bearing chamber 14 is formed in the upper portion of the housing 13, and the blow-by gas supply passage 9 from the engine 2 described above is connected to the through passage 13PA. Therefore, the blow-by gas BG generated on the engine 2 side is supplied into the bearing chamber 14.

  The rotary main shaft 15 is formed with a blow-by gas circulation path 20 through which the blow-by gas BG flows to the compressor unit 11 side. This blow-by gas circulation path 20 is constituted by a main passage extending in the axial direction inside the rotary main shaft 15 and a gas introduction passage arranged radially with respect to the shaft. This point will be further described with reference to FIG. FIG. 3A is an enlarged view of a part of the compressor wheel 16 and the rotation main shaft 15 shown in FIG. 2, and FIG. 3B is a view taken along the line AA in FIG. is there.

  A main passage 20HP is provided in a central portion of the rotation main shaft 15 along an axis AL from a midway position to a front end portion to which the compressor wheel 16 is fixed. The end of the main passage 20HP is an opening 20HL serving as a gas outlet.

  A gas introduction passage 20RP is formed radially on the opposite side of the compressor wheel 16 with respect to the main passage 20HP. That is, the gas introduction passage 20 </ b> RP is arranged radially with respect to the rotation center of the rotation main shaft 15. The gas introduction passage 20RP serves as a gas inlet for introducing the blow-by gas BG that has entered the bearing chamber 14 into the main passage 20HP. As shown in FIG. 3B, for example, four (plural) gas introduction passages 20RP are provided radially. Since the blow-by gas circulation path 20 is formed by the main passage 20HP and the gas introduction passage 20RP as described above, the blow-by gas BG in the bearing chamber 14 can be guided to the compressor unit 11 side. The blow-by gas circulation path 20 and the blow-by gas supply path 9 described above form a communication path (first communication path) through which blow-by gas generated on the engine 2 side flows to the compressor unit 11 side of the turbocharger 10A. It becomes a state.

  An operation of processing blow-by gas in the internal combustion engine 1A to which the blow-by gas processing apparatus having the above-described configuration is applied will be described. As shown in FIG. 2, the blow-by gas BG generated on the engine 2 side is supplied into the bearing chamber 14 via the blow-by gas supply path 9. When the engine 2 and the turbocharger 10A are operated, if blow-by gas is accumulated in the crankcase, the pressure becomes higher than the atmospheric pressure, so that it tends to flow outward. Furthermore, since the blow-by gas circulation path 20 (the main passage 20HP and the gas introduction passage 20RP) formed in the rotation main shaft 15 connects the compressor side and the bearing chamber 14 which are negative pressure, the pressure in the bearing chamber 14 is reduced. Therefore, a situation is formed in which the blow-by gas BG easily flows into the bearing chamber 14.

  Referring now to FIG. 3, when the rotating spindle 15 is stopped, the blow-by gas BG that has entered the bearing chamber 14 is sent to the compressor unit 11 side as it is. However, when the turbocharger 10A is in operation, the rotary spindle 15 rotates in the predetermined direction R at a high speed (for example, 100,000 rotations). Therefore, when the blow-by gas BG containing oil mist (oil component) flows into the gas introduction passage 20RP, the oil mist MS having a large mass is blown off and separated as shown in the figure. As a result, the blow-by gas BG that passes through the gas introduction passage 20RP and enters the main passage 20HP can be brought into a state close to the original blow-by gas from which the oil has been removed. In addition, when dust etc. are further mixed in blowby gas BG, these can also be separated and removed. As shown in FIG. 1, the blow-by gas BG from which the oil mist and contaminants have been removed can be mixed with the intake air SA and sent to the intake manifold TM for combustion.

  As described above, the blow-by gas processing apparatus applied to the internal combustion engine 1A includes the blow-by gas supply path 9 that supplies the blow-by gas BG generated on the engine 2 side to the bearing chamber 4 of the turbocharger 10A. Further, the rotation main shaft 15 is provided with a blow-by gas circulation path 20 that communicates the bearing chamber 14 and the compressor unit 11 side. Since the blow-by gas circulation path 20 includes the gas introduction paths 20RP arranged radially, the blow-by gas circulation path 20 functions as an oil separator that separates the oil content in the blow-by gas BG when the rotary main shaft 15 rotates. Therefore, in the internal combustion engine 1A of the first embodiment, as shown in FIG. 1, the oil component is removed from the blow-by gas BG that flows toward the compressor unit 11 and merges with the intake air SA. Therefore, since oil can be prevented from flowing into the intake side of the engine 2, exhaust emission deterioration and oil reduction can be prevented. Further, in this embodiment, since the rotary main shaft 15 is processed as described above to remove the oil content in the blow-by gas BG, the apparatus can be downsized and the peripheral structure can be simplified.

  Note that the oil separated from the blow-by gas BG by the rotation of the rotation main shaft 15 as described above scatters around, but the bearing chamber 14 stores gears, bearings, and the like for rotating the rotation main shaft 15. In order to drive these smoothly, oil is supplied from the engine 2 side through a route (not shown). An oil drain portion 18 for receiving the oil after lubrication is provided at the lower portion of the bearing chamber 14. Therefore, the oil separated from the blow-by gas BG is also collected together in the oil drain portion 18, returned to the oil pan (not shown) disposed at the lower portion of the engine 2, and circulated again for lubrication. Therefore, oil reduction can be suppressed as compared with the conventional blow-by gas processing apparatus.

  In the first embodiment, the blow-by gas BG is supplied to the suction side of the compressor unit 11 as described above, but the oil mist is removed as described above. Therefore, as pointed out earlier, it is possible to prevent the occurrence of the problem that the oil component adheres and accumulates near the compressor as in the conventional apparatus.

  Furthermore, Embodiment 2 according to the present invention will be described with reference to FIGS. The second embodiment is different from the first embodiment in the structure for flowing blow-by gas along the rotation main shaft of the turbocharger. In the first embodiment, the passage (blow-by gas circulation path 20) for flowing the blow-by gas BG is formed inside the rotation main shaft 15 of the turbocharger 10A. However, in the second embodiment, the passage is provided outside the rotation main shaft. Provided.

  4 is an enlarged view of the periphery of the compressor portion of the turbocharger 10B. FIG. 5A is a WW sectional view in FIG. 4, FIG. 4B is an XX sectional view, and FIG. C) is a YY sectional view, and (D) is a ZZ sectional view. An oil slinger (also referred to as a flinger) 27 is engaged with the rotation main shaft 25 of the turbocharger 10B. The oil slinger 27 is a member arranged so that the oil in the bearing chamber does not flow out, and is a component that is also used in a conventional turbocharger. The oil slinger 27 rotates together with the rotary spindle 25 and prevents the oil from flowing out by blowing off the oil by centrifugal force.

  In the present embodiment, gas inlet passages 28RP are provided radially in the oil slinger 27. For example, as shown in FIG. 5A, the gas introduction passage 28 </ b> RP is provided radially with respect to the center of the oil slinger 27. Further, the oil slinger 27 is provided with a main passage 28HP extending along the axial direction of the rotary main shaft 25 on the center side. The main passage 28HP and the gas introduction passage 28RP of the second embodiment correspond to the main passage 20HP and the gas introduction passage 20RP provided in the rotary main shaft 15 of the turbocharger 10A described in the first embodiment. As shown in FIG. 5A, the gas introduction passage 28RP is inclined at an angle α with respect to the radial direction. When the introduction passage 28RP is set so as to be inclined in this manner, the flow rate can be easily secured by approaching the relative inflow angle of the blow-by gas BG, and the function of oil mist separation can be enhanced.

  Further, as shown in FIG. 4, a long groove portion 30 is formed on the inner diameter surface of the compressor wheel 26 along the axial direction of the rotary main shaft 25. The long groove portion 30 is set so as to be positioned substantially on the same line as the main passage 28HP provided on the oil slinger 27 side. The long groove portion 30 allows the blow-by gas BG to be sent to the compressor end. Therefore, in the second embodiment, the main passage 28HP of the oil slinger 27 and the long groove portion 30 of the compressor wheel 26 correspond to the main passage 20HP of the first embodiment described above. However, as shown in FIG. 5B, the right end side is formed by a plurality of groove portions 30CH branched from the long groove portion 30 in order to take the axial center position of the compressor wheel 26 with respect to the rotation main shaft 25.

  The other end side (the left side in FIG. 4) of the long groove portion 30 is blocked by a nut 31 that fixes the compressor wheel 26 to the rotating main shaft 25. Grooves 32 that serve as gas outlet passages of the groove 30 are formed radially. As shown in FIG. 5D, the groove 32 is provided radially with respect to the center of the nut 31 (the axis center of the rotation main shaft 25).

  In the second embodiment described above, the gas introduction passage 28RP provided in the oil slinger 27 engaged with the rotary main shaft 25 functions as an oil separator. In the structure of the second embodiment, the parts (oil slinger 27 and compressor wheel 26) to be assembled to the rotary main shaft 25 are processed, so that the outside of the rotary main shaft 25, that is, the rotary main shaft 25, the oil slinger 27, and the compressor wheel are processed. The main passage 28HP is provided between the main passage 26 and the same effect as in the first embodiment. In the case of the first embodiment described above, since a passage is formed in the rotary main shaft 15, it is necessary to change the material and the shaft diameter in order to maintain the strength. Since the main shaft 25 is not processed, a conventional rotating main shaft can be employed.

  However, the main passage 28HP may be formed by processing the surface of the rotating main shaft 25 and the parts, instead of processing only the component side assembled to the rotating main shaft 25 as in the second embodiment. Good. Also in this case, there is an advantage in that the machining can be easily performed as compared with the case where the main passage is provided in the rotary main shaft 25. Note that the structure in which the gas outlet passages 32 for the blow-by gas BG described in the second embodiment are provided radially may be applied to the first embodiment.

  The third embodiment is designed so that the passage through which the blow-by gas BG flows can be changed according to the operating state of the engine 2 so that it can cope with an increase in the amount of blow-by gas when the engine is operated at high speed and high load. It is an example of the blow-by gas processing apparatus improved in the above. FIG. 6 is a diagram schematically illustrating a configuration of an internal combustion engine 1B including the blow-by gas processing apparatus according to the third embodiment. The basic structure of the internal combustion engine 1B is the same as that of the internal combustion engine 1A of the first embodiment shown in FIG. 1, and the turbocharger employed is the type of the turbocharger 10A shown in the first embodiment, or the second embodiment. Any of the turbocharger 10B types shown in FIG. Therefore, in FIG. 6, the same parts as those of the internal combustion engine 1 </ b> A are denoted by the same reference numerals and redundant description is omitted. And about a turbocharger, it shows with the code | symbol 10 without limiting a type.

  The blow-by gas processing apparatus applied to the internal combustion engine 1B includes a branch passage (second passage) branched from a blow-by gas supply passage 9 (first communication passage) for supplying blow-by gas BG generated in the engine 2 to the turbocharger 10. (Communication path) 40 is provided. The other end of the branch passage 40 is connected to the intake pipe 3 upstream from the turbocharger 10. In the middle of the branch passage 40, a valve device 41 whose opening degree is adjusted according to the operating state of the engine 2 and a mist separator 45 for removing the oil mist of the blow-by gas BG passing therethrough are disposed. Yes. The valve device 41 includes an on-off valve 42 and an actuator 43 that drives the valve. Driving of the actuator 43 is controlled by an ECU (Electronic Control Unit) 44 of the internal combustion engine 1.

  In the internal combustion engine 1B to which the blow-by gas processing apparatus having the above configuration is applied, the operation of the engine 2 is performed at a high speed and a high load so that the flow rate of the blow-by gas BG increases, and the blow-by gas in the turbocharger 10 is increased. When the processing reaches a limit, the ECU 44 adjusts the opening degree of the valve device 41 and causes the blowby gas BG to flow upstream of the turbocharger 10 via the branch passage 40. Thereby, blow-by gas is efficiently processed at two locations. In the blow-by gas processing apparatus according to the third embodiment, when the engine 2 becomes high-speed and high-load and the blow-by gas amount increases, the blow-by gas processing device increases the processing amount by flowing it upstream of the intake pipe 3. Therefore, blow-by gas can be reliably processed according to the operating condition of the engine 2. Further, since the blow-by gas BG is caused to flow to the branch passage 40 side at the time of high speed and high load operation, the mist separator 45 can be made relatively simple.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. It can be changed.

1 is a diagram illustrating a configuration of an internal combustion engine 1A including a blow-by gas processing device according to Embodiment 1. FIG. It is the figure which expanded and showed the turbocharger shown in FIG. (A) is the figure which expanded and showed a part of compressor wheel and rotation main axis | shaft which are shown in FIG. 2, (B) is an AA arrow line view in (A). It is the figure which expanded and showed the periphery of the compressor part of the turbocharger which concerns on Example 2. FIG. (A) is a WW sectional view in FIG. 4, (B) is an XX sectional view, (C) is a YY sectional view, and (D) is a ZZ sectional view. It is the figure which showed the structure of the internal combustion engine 1B provided with the blowby gas processing apparatus which concerns on Example 3. FIG.

Explanation of symbols

1 (1A, 1B) Internal combustion engine 2 Engine (internal combustion engine body)
DESCRIPTION OF SYMBOLS 3 Intake pipe 4 Exhaust pipe 5 Intake passage 7 Intake valve 9 Blow-by gas supply path 10 (10A, 10B) Turbocharger 11 Compressor part 12 Turbine part 14 Bearing chamber 15 Rotation main shaft 16 Compressor wheel 17 Turbine wheel 20 Blow-by gas circulation path 20HP Main Passage 20RP Gas introduction passage (oil separation means)
28HP main passage 28RP gas introduction passage (oil separation means)
30 Main passage 32 Gas outlet passage 40 Branch passage 41 Valve device 44 ECU
45 Mist separator BG Blow-by gas MS Oil mist SA Intake EG Exhaust gas

Claims (6)

A blow-by gas processing apparatus for an internal combustion engine equipped with a turbocharger,
A first communication passage for causing blow-by gas generated in the internal combustion engine to flow to the compressor side along the rotation main shaft of the turbocharger;
The blow-by gas processing apparatus for an internal combustion engine, wherein the first communication passage is provided with an oil separation means for separating an oil component from the blow-by gas in the turbocharger. The first communication path includes a blow-by gas supply path for supplying the blow-by gas to a bearing chamber of the turbocharger, and a blow-by gas circulation path for flowing the blow-by gas from the bearing chamber to the compressor side along the rotation main shaft. Including
2. The blow-by gas processing apparatus for an internal combustion engine according to claim 1, wherein the oil separation means is provided in the blow-by gas circulation path. The blow-by gas circulation path includes a main passage provided along an axis inside the rotation main shaft, and a gas introduction passage provided radially from the main passage;
The blow-by gas processing apparatus for an internal combustion engine according to claim 2, wherein the gas introduction passage serves as the oil separation means when the rotation main shaft rotates. The turbocharger further includes an oil slinger that engages with the rotating main shaft and rotates integrally to prevent the oil in the bearing chamber from flowing out to the outside.
The blow-by gas circulation path includes a main passage provided between the rotary shaft and the oil slinger and the compressor wheel along the axis of the rotary main shaft, and a gas introduction passage provided radially from the main passage in the oil slinger. Including
The blow-by gas processing apparatus for an internal combustion engine according to claim 2, wherein the gas introduction passage serves as the oil separation means when the rotation main shaft rotates. The blow-by gas processing apparatus for an internal combustion engine according to claim 3 or 4, wherein a gas outlet passage on the compressor side of the blow-by gas is provided radially. A second communication path that is branched from the first communication path and circulates the blow-by gas to the compressor upstream side of the turbocharger via a mist separator;
The internal combustion engine according to any one of claims 1 to 5, wherein a valve device whose opening degree is adjusted in accordance with an operating state of the internal combustion engine is disposed in the second communication path. Blow-by gas processing equipment.

Images