JP5321088B2 - Lubricating oil recovery device - Google Patents

Description

  According to the present invention, lubricating oil in a compressor passage disposed between an intake passage and an internal combustion engine body in a supercharger disposed between an intake passage and an exhaust passage of the internal combustion engine and the internal combustion engine body is used as an internal combustion engine. The present invention relates to a lubricant recovery device to be introduced into an engine body.

  Since a minute gap is formed between the cylinder formed in the block of the internal combustion engine and the piston disposed in the cylinder, the combustion chamber side while the internal combustion engine repeatedly performs the compression and expansion processes. So-called blow-by gas is generated in which the combustion gas leaks out to the crankcase side through the gap. Since this blow-by gas contains an acidic water vapor component or the like, if the blow-by gas is left untreated, the engine oil in the oil pan disposed at the lower part of the crankcase may deteriorate. In addition, since a mist-like or gaseous oil component is floating in the crankcase, the blow-by gas in the crankcase contains an oil component.

  Further, since the blow-by gas released into the atmosphere causes pollution, it is necessary to process the blow-by gas inside the internal combustion engine. Thus, a recent internal combustion engine is provided with a blow-by gas reduction device that introduces blow-by gas into the combustion chamber again. For example, Patent Document 1 discloses a blow-by gas reduction device for a diesel engine. In this blow-by gas reduction device, a venturi pipe is disposed in the middle of an intake passage connecting an intake manifold from the compressor side of the supercharger, and the venturi pipe is connected to a crankcase by piping. When intake air flows into the intake passage, negative pressure is generated in the venturi pipe so that blow-by gas in the crankcase is sucked out to the intake passage side. The blow-by gas sucked out to the intake pipe side is mixed with intake air and burned in the combustion chamber.

JP-A-8-270509

  However, in the blow-by gas reduction device of Patent Document 1, blow-by gas containing engine oil is combusted, so there is a concern about deterioration of exhaust emission, and engine oil is combusted, so it is periodically replenished. Consideration is also necessary.

  Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lubricating oil recovery device that suppresses both deterioration of exhaust emission and reduction of engine oil.

(1) In invention of Claim 1, it arrange | positions between the said intake passage and said internal combustion engine main body in the supercharger arrange | positioned between the intake passage and exhaust passage of an internal combustion engine, and an internal combustion engine main body. In the lubricating oil recovery apparatus for introducing the lubricating oil in the compressor passage into the internal combustion engine body, the supercharger communicates with the bearing chamber, the bearing chamber, and lubricates the supercharger via the oil pan connection path. A drain pan for introducing oil into an oil pan of the internal combustion engine body, and the supercharger is connected to the downstream side of the compressor passage and to the bearing chamber, and the lubricating oil in the compressor passage is The gist is that a communication path for introduction into the internal combustion engine body is provided.

According to this invention, in the compressor passage, blow-by gas sucked into the compressor passage is separated by the action of centrifugal force, and oil components adhering to the inner peripheral surface of the compressor passage and the bearing portion of the supercharger Lubricating oil such as oil that leaks into the compressor passage from the like. The lubricating oil moves toward the downstream side of the compressor passage by the air flow in the compressor passage. Therefore, the communication passage is provided on the downstream side of the compressor passage, whereby the lubricating oil is introduced into the internal combustion engine body through the communication passage. Therefore, since the oil component contained in the blow-by gas is introduced into the internal combustion engine body, it is possible to suppress both deterioration of exhaust emission and reduction of engine oil caused by the oil component being combusted in the combustion chamber. become able to.
(2) In the invention of claim 2, a guide portion for guiding the lubricating oil adhering to the compressor passage to the communication passage on the downstream side of the peripheral edge of the outlet side opening portion which is a connecting portion between the communication passage and the compressor passage. The guide portion is formed as a wall portion protruding from the compressor passage.

The schematic diagram which shows the whole structure of the internal combustion engine about embodiment of the blow-by gas reduction apparatus of the internal combustion engine which concerns on this invention. Sectional drawing which shows the cross-section which cut | disconnected the supercharger in the plane along the rotation main axis | shaft about the blow-by gas reduction apparatus of the internal combustion engine of the embodiment.

With reference to FIG.1 and FIG.2, one Embodiment which actualized the lubricating oil collection | recovery apparatus of this invention is described. First, the overall configuration of the internal combustion engine 1 will be described with reference to FIG.
As shown in FIG. 1, an intake passage 3 is connected to an intake side of an internal combustion engine body (hereinafter referred to as “engine”) 2, and an exhaust passage 4 is connected to an exhaust side. An air cleaner 5 and an intercooler 6 are disposed in the intake passage 3 from the upstream side thereof. Thus, the intake air SA introduced into the intake passage 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. Further, an exhaust purification device (or catalytic converter) 7 is disposed in the exhaust passage 4. As a result, the exhaust EG that has flowed out of the exhaust manifold EM into the exhaust passage 4 is purified and then discharged outside the apparatus.

  The internal combustion engine 1 is provided with a supercharger 10. Specifically, the compressor unit 11 of the supercharger 10 is connected upstream of the intercooler 6 in the intake passage 3 and downstream of the air cleaner 5, and the turbine unit 12 is upstream of the exhaust purification device 7 in the exhaust passage 4. Connected to the side. That is, the intake air SA in the intake passage 3 is introduced into the engine 2 through the compressor unit 11, and the exhaust EG from the engine 2 flows out into the exhaust passage 4 through the turbine unit 12.

  Further, the internal combustion engine 1 is provided with a blow-by gas reduction device. Specifically, a blow-by gas supply path 9 for connecting the head cover 8 above the engine 2 and the upstream side of the compressor unit 11 of the supercharger 10 and taking out the blow-by gas BG generated therein is provided. Next, a communication path 20 for introducing the oil component of the blow-by gas BG into the housing 13 of the supercharger 10 is provided on the downstream side of the compressor unit 11. The oil component is introduced into an oil pan (not shown) of the engine 2 through the housing 13.

  A detailed structure of a lubricating oil recovery mechanism that is provided in the supercharger 10 and that recovers lubricating oil such as an oil component contained in the blow-by gas BG to the engine 2 will be described below with reference to FIG.

  As shown in FIG. 2, a bearing chamber 14 that is a predetermined space is provided in the housing 13 of the supercharger 10. The bearing chamber 14 accommodates the rotary main shaft 15 in a horizontally placed state. One end of the rotation main shaft 15 extends to the compressor unit 11 side, and a compressor wheel 16 provided with compressor blades is fixed to the end of the rotation main shaft 15. On the other hand, 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.

  In addition, two rotating main shafts 15 are arranged apart from each other in the axial direction, and each of them is rotatably supported by a substantially cylindrical bearing portion 19 fixed to the housing 13. The bearing portion 19 is a so-called slide bearing in which the rotary main shaft 15 is supported by oil supplied to the inner peripheral surface of the bearing portion 19.

  Here, the bearing chamber 14 is an annular space formed so as to surround the rotation main shaft 15 and the bearing portion 19 from the rotation radial direction. An oil drain portion 18 for returning lubricating oil such as an oil component in the bearing chamber 14 to the oil pan is provided below the bearing chamber 14 in the vertical direction. An oil pan connection path 24 that is a pipe connected to the oil pan is provided below the oil drain portion 18 in the vertical direction.

  The compressor section 11 is provided with a compressor passage 110 through which intake air SA is introduced from the intake passage 3. The compressor passage 110 is provided along the rotation main shaft 15 and is provided with an introduction portion 111 having an intake port 11a. Then, at the end of the introduction portion 111 opposite to the intake port, a centrifugal portion 112 that is a passage formed so as to surround the rotation main shaft 15 from the radial direction is provided. A lead-out portion 113, which is a passage extending in a direction orthogonal to the rotation main shaft 15, is provided at the end of the centrifugal portion 112 opposite to the introduction portion 111. Further, the centrifugal section 112 is formed so that its cross-sectional area increases as it goes to the outlet section 113. Here, the compressor passage 110 is formed such that the passage cross-sectional area of the lead-out portion 113 is maximized in the compressor passage 110.

  The lead-out portion 113 is provided with a guide portion that guides the oil component to the communication passage 20 and an annular wall portion 114 that protrudes inward from the inner peripheral portion thereof. A lead-out side opening 115 that is a through-hole penetrating the lead-out portion 113 is provided immediately before the wall portion 114. Further, the bearing chamber 14 is provided with a bearing chamber-side opening 141 that is a through hole that communicates the bearing chamber 14 with the outside of the supercharger 10. The communication passage 20 connects the outlet opening 115 and the bearing chamber opening 141 to each other.

  A first connection pipe 21, which is a cylindrical metal pipe, is press-fitted into the outlet opening 115. Further, the second connecting pipe 22 that is a cylindrical metal pipe is press-fitted into the bearing chamber side opening 141. And the flexible hose 23 formed of elastic members, such as rubber | gum, is connected so that the 1st connection pipe 21 and the 2nd connection pipe 22 may be connected. The first connection pipe 21, the second connection pipe 22, and the hose 23 constitute a communication path 20.

  Further, the thickness of the portion of the housing 13 where the bearing chamber side opening 141 is provided is formed to be thicker than the thickness around the portion of the housing 13. Further, as shown in an enlarged view (A enlarged view) of a broken-line circle in FIG. 2, the bearing chamber side opening 141 is provided with a press-fit portion 141 a into which the second connection pipe is press-fitted. A tapered opening 141 b that is connected to the press-fit portion 141 a and expands toward the second connecting pipe 22 is provided. In addition, there is provided a throttle portion 141c that is connected to the opening portion 141b and formed to have an inner diameter that is smaller than the inner diameter of the opening portion 141b. The flow rate of the blow-by gas BG introduced into the communication path 20 is controlled by the throttle portion 141c.

Next, separation of the oil component contained in the blowby gas BG and the flow of the oil component will be described.
The blow-by gas BG introduced into the compressor passage 110 together with the intake air SA is separated from the oil component contained in the blow-by gas BG by the action of centrifugal force in the centrifugal section 112. The separated oil component adheres to the inner peripheral surface of the centrifugal portion 112. And the oil component adhering to the centrifuge part 112 moves to the derivation | leading-out part 113 by the effect | action of an airflow.

  Next, the oil component that has moved to the inner peripheral surface of the outlet portion 113 is guided to the outlet-side opening 115 by colliding with the wall portion 114. That is, the oil component is guided to the communication path 20 by the wall portion 114. At the same time, a part of the blow-by gas BG passing through the outlet 113 is also introduced into the outlet opening 115. The oil component is guided from the outlet opening 115 to the bearing chamber 14 through the first connection pipe 21, the hose 23, and the second connection pipe 22.

  Finally, the oil component guided to the bearing chamber 14 moves from the space S1 in the vertical direction above the rotation main shaft 15 and the bearing portion 19 to the space S2 in the lower direction in the vertical direction by the action of gravity and blow-by gas BG. At the same time, it moves to the oil drain portion 18 which is the lowermost vertical direction in the bearing chamber 14. Then, the oil is returned to the oil pan via the oil drain connecting portion 24 via the oil drain portion 18. As described above, since the oil component contained in the blow-by gas BG returns to the oil pan again, it is possible to suppress a decrease in the engine oil stored in the oil pan.

  Further, in the supercharger 10, due to the pressure difference between the compressor passage 110 and the bearing chamber 14, that is, due to the same pressure difference generated when the compressor passage 110 becomes negative pressure, the bearing portion 19 moves to the compressor passage 110. The oil in the bearing portion 19 may leak out. Also in this respect, since the communication path 20 is provided on the downstream side of the compressor unit 11, the oil is guided to the communication path 20 and returned to the oil pan via the bearing chamber 14 as described above.

According to the lubricating oil recovery apparatus of the present embodiment, the following effects can be obtained.
(1) According to the present embodiment, the blow-by gas BG is introduced into the compressor unit 11 of the supercharger 10 via the blow-by gas supply path 9, and the oil component is supplied to the oil pan from the downstream side of the compressor passage 110 of the compressor unit 11. This is a configuration in which a communication path 20 is provided for introducing the. According to this configuration, the blow-by gas BG supplied to the compressor unit 11 is separated from the oil component contained in the blow-by gas BG in the centrifugal unit 112 of the compressor unit 11 and adheres to the inner peripheral surface of the centrifugal unit 112. The attached oil component is guided to the communication path 20. Then, the oil component is returned to the oil pan through the communication path 20. As a result, since the oil component contained in the blow-by gas BG introduced into the supercharger 10 is returned to the oil pan, it is possible to suppress a decrease in engine oil stored in the oil pan. In addition, since the oil component is introduced into the communication passage 20, the amount of the oil component introduced into the combustion chamber is suppressed. Therefore, it is possible to suppress both the deterioration of exhaust emission and the reduction of engine oil due to the oil component being burned in the combustion chamber.

  Further, oil may leak from the bearing portion 19 to the compressor passage 110 due to a pressure difference between the compressor passage 110 and the bearing chamber 14, but the communication passage 20 is provided on the downstream side of the compressor portion 11. The oil is returned to the oil pan as well. Therefore, the effect of suppressing the reduction in engine oil can be further improved.

  (2) According to the present embodiment, the wall portion 114 is formed in an annular shape on the inner peripheral surface of the lead-out portion 113. According to this configuration, the lubricating oil adhering to the inner peripheral surface of the lead-out portion 113 can be efficiently guided to the communication path 20. Therefore, since it is further suppressed that the lubricating oil is introduced into the combustion chamber via the intake passage 3, it is possible to further suppress both reduction of engine oil and deterioration of exhaust emission.

  (3) According to the present embodiment, the wall 114 is provided on the downstream side of the periphery of the outlet opening 115. According to this configuration, the lubricating oil adhering to the wall 114 flows into the outlet-side opening 115. Therefore, the lubricating oil can be efficiently guided from the wall portion 114 to the communication path 20.

  (4) According to the present embodiment, the bearing chamber side opening 141 is provided with the throttle portion 141c. According to this configuration, it is possible to suppress the flow rate of the blow-by gas BG itself introduced from the outlet 113 of the compressor passage 110 to the communication passage 20. Therefore, it is possible to suppress a decrease in the flow rate of the blow-by gas BG from the derivation unit 113 toward the engine 2 and the flow rate of the intake air from the intake passage 3, and it is possible to suppress a decrease in the performance of the supercharger 10. .

  (5) According to the present embodiment, the hose 23 constituting the communication path 20 has a flexible structure. According to this configuration, since the hose 23 is bent, the connection between the first connection pipe 21 and the second connection pipe 22 is facilitated, and thus the supercharger 10 can be easily manufactured. In addition, the space in which the hose 23 is disposed can be reduced compared to the case where the hose is an L-shaped piping member having no flexibility.

(Other embodiments)
The blow-by gas reduction apparatus of the present invention is not limited to the above-described embodiment, and the following modifications are possible.

  -In this embodiment, although the hose 23 which comprises the communicating path 20 was comprised by the member which has flexibility, the material of the hose 23 is not limited to this. For example, instead of the hose 23, a pipe having no flexibility such as a pipe may be used.

  -In this embodiment, although the wall part 114 provided in the internal peripheral surface of the derivation | leading-out part 113 was comprised by the annular shape, the shape of the wall part 114 is not limited to this. Since the wall 114 may have any shape that can guide the oil component to the communication path 20, for example, the wall 114 may have an arc shape extending toward the outlet opening 115.

  In the present embodiment, the blow-by gas reduction device includes one supercharger 10, but the configuration of the blow-by gas reduction device is not limited to this. For example, the blow-by gas reduction device may include a plurality of superchargers 10.

  DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine, 2 ... Engine (internal combustion engine main body), 3 ... Intake passage, 4 ... Exhaust passage, 5 ... Air cleaner, 6 ... Intercooler, 7 ... Exhaust gas purification device, 8 ... Head cover, 9 ... Blow-by gas supply port, DESCRIPTION OF SYMBOLS 10 ... Supercharger, 11 ... Compressor part, 11a ... Inlet, 110 ... Compressor passage, 111 ... Introducing part, 112 ... Centrifugal part, 113 ... Deriving part, 114 ... Wall part, 115 ... Deriving side opening part, 12 ... Turbine part, 13 ... housing, 14 ... bearing chamber, 141 ... bearing chamber side opening part, 141a ... press-fitting part, 141b ... opening part, 141c ... throttling part, 15 ... rotating main shaft, 16 ... compressor wheel, 17 ... turbine wheel, DESCRIPTION OF SYMBOLS 18 ... Oil drain part, 19 ... Bearing part, 20 ... Communication path, 21 ... 1st connection pipe, 22 ... 2nd connection pipe, 23 ... Hose, 24 ... Oil pan connection path, 0 ... sub turbocharger, 31 ... bearing chamber, 32 ... housing, 321 ... connection passage, 33 ... bearing portion, 331 ... receiving portion, 34 ... seal ring.

Claims (2)

Lubricating oil in a compressor passage disposed between the intake passage and the internal combustion engine body in a supercharger disposed between the intake passage and exhaust passage of the internal combustion engine and the internal combustion engine body is used as the internal combustion engine. In the lubricating oil recovery device introduced into the main body,
The supercharger has a drain pan portion that communicates with the bearing chamber and the bearing chamber and introduces lubricating oil of the supercharger into the oil pan of the internal combustion engine body through an oil pan connection path,
Wherein the supercharger is connected to said respective downstream side and the bearing chamber of the compressor passage, wherein the communicating passage for introducing the lubricating oil in the compressor passage to said internal combustion engine body is provided Lubricating oil recovery device.   A guide portion that guides the lubricant oil adhering to the compressor passage to the communication passage on the downstream side of the periphery of the outlet side opening portion that is a connection portion between the communication passage and the compressor passage;
  The guide portion is formed as a wall portion protruding from the compressor passage.
  The lubricating oil recovery device according to claim 1.

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