JP2010174734A - Positive crankcase ventilation system for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a positive crankcase ventilation system making an engine block commonized for separators of different specifications without trouble in piping and assembly work of the separator. <P>SOLUTION: In the positive crankcase ventilation system for the internal combustion engine acquiring and collecting mist shape liquid component contained in blow-by gas by an oil separator 45 and making the collected liquid component flow down into the engine 10 through a drain passage blow-by gas suction passages 55a, 55b from an inside of the engine 10 to the separator 45 and an oil drain passage 56 from the separator 45 into the internal combustion engine 10 pass through corresponding insides of first attachment members 61, 63 and second attachment member 62 out of a plurality of attachment members 61-64 for fixing the separator 45 on an outer wall section of the engine 10 respectively. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a blow-by gas reduction device for an internal combustion engine, and more particularly to a blow-by gas reduction device for an internal combustion engine in which a separator for gas-liquid separation such as an oil separator is arranged on a return passage to a blow-by gas intake system.

  In an internal combustion engine for a vehicle (hereinafter simply referred to as an engine), blow-by gas containing unburned air-fuel mixture, burned combustion gas, etc. enters a crankcase from a combustion chamber through a gap between a cylinder and a piston. Since it leaks out, it is equipped with a blow-by gas reduction device that ventilates the crankcase to prevent engine oil deterioration.

  In this blow-by gas reduction device, if a high-temperature blow-by gas that is recirculated to the intake system contains a liquid component such as oil mist, the oil component adheres to the important components of the intake system, resulting in malfunction due to deposit formation. For this reason, a separator that captures and collects oil mist and the like on the blow-by gas recirculation passage is often used.

  As a conventional blow-by gas reduction device for this type of internal combustion engine, for example, an oil separator is fastened and fixed to an engine block by a metal mounting bracket, while a blow-by gas is taken from the inside of the engine to the separator and from the separator. There are pipes for recirculating blow-by gas to the air cleaner and drain pipes for the recovered oil inside the engine (see, for example, Patent Documents 1 and 2).

  In addition, a device that captures and collects liquid components such as oil mist has a built-in PCV valve that responds to the differential pressure between the intake pressure (intake negative pressure) and the blow-by gas pressure on the crankcase side. There is known a PCV (Positive Crankcase Ventilation) system that allows forced ventilation inside the case (see, for example, Patent Document 3).

  Furthermore, recently, a part of the separator is integrated into the engine block to reduce the number of parts, and in order to form a gas-liquid separation chamber on the engine block side, a recess or a rib that becomes a collision wall for gas-liquid separation is formed. Are also put into practical use (for example, see Patent Document 4).

Japanese Utility Model Publication No. 62-173511 Japanese Patent Laid-Open No. 06-288218 JP-A-10-89039 JP 2008-57501 A

  However, in a conventional blow-by gas reduction device for an internal combustion engine in which an independent separator is fixed to a block such as a cylinder block that forms the outer wall of the engine with a bracket, a large number of parts are used for connecting a plurality of pipes and fixing the separator. However, there is a problem that the piping and assembly work are time-consuming.

  On the other hand, it is conceivable that a resin-made separator main body is provided with a hook for locking, etc., and locked in the recess on the engine block side. There is not much advantage.

  On the other hand, integrating a part of the separator with the block that forms the outer wall of the engine has the advantage of greatly reducing the number of parts and the number of man-hours for assembling the separator, but the cylinder that forms the main part of the block Since it is necessary to form recesses and ribs for the separator in the block, the block configuration becomes complicated, and it is also necessary to use multiple separators with different specifications for the same block (for example, when you want to share a cylinder block) In some cases, it was difficult to improve productivity. In addition, there has been a problem that it is necessary to remodel the cylinder block, which is a large component, when changing the specifications of the oil separator.

  The present invention has been made in order to solve the above-described conventional problems, and does not require labor for assembling the separator and piping, and the shape of the block forming the outer wall of the internal combustion engine is simple. An object of the present invention is to provide a blow-by gas reduction device with excellent productivity that allows the same block to be shared with different separators.

  In order to achieve the above object, the blow-by gas reduction apparatus according to the present invention (1) recirculates the blow-by gas generated inside the internal combustion engine to the intake side of the internal combustion engine, and uses the blow-by gas by a separator having a gas-liquid separation chamber. A blow-by gas reduction device for an internal combustion engine that captures and collects a mist-like liquid component contained therein and causes the liquid component recovered by the separator to flow down into the internal combustion engine. A suction passage for the blow-by gas from the separator to the separator, and a drain passage for the liquid from the separator to the inside of the internal combustion engine, respectively, for fastening and fixing the separator to a block forming an outer wall of the internal combustion engine The plurality of mounting members pass through the corresponding first mounting member and second mounting member. The features.

  With this configuration, it is possible to perform reliable attachment of the separator to the internal combustion engine using the plurality of attachment members and piping work of the separator only by fastening and fixing the plurality of attachment members to the block forming the outer wall of the internal combustion engine. . Further, on the block side of the internal combustion engine, it is only necessary to form a part of the blow-by gas intake passage and the liquid drain passage and to form a portion to which the mounting member is fastened and fixed, thereby simplifying the block shape. In addition, blocks can be shared for separators with different specifications. Therefore, the productivity of the internal combustion engine equipped with the blow-by gas reduction device is improved.

  In the blow-by gas reducing apparatus having the configuration described in (1) above, (2) the first attachment member and the second attachment member are respectively a suction passage for the blow-by gas and a drain passage for the liquid. It is preferable to have the passage hole part which forms any, and the fastening flange part which surrounds this passage hole part.

  With this configuration, a blow-by gas suction passage or a liquid drain passage can be easily formed in the mounting member, and the required rigidity of the mounting member can be easily secured.

In the blow-by gas reducing apparatus having the configuration described in (1) and (2) above, (3)
Preferably, the internal combustion engine is an in-line multi-cylinder internal combustion engine, and the first mounting member and the second mounting member are separated from each other in the arrangement direction of the cylinders of the internal combustion engine.

  With this configuration, the first mounting member and the second mounting member can be sufficiently separated in the cylinder arrangement direction, and the separator can be reliably supported by both mounting members.

  In the blow-by gas reduction device having the configuration described in (3) above, (4) the first mounting member and the second mounting member are arranged inside the internal combustion engine in the arrangement direction of the cylinders of the internal combustion engine. It is good to be located on both sides of the partition between the provided cylinders.

  With this configuration, even when blowby gas is difficult to flow in the crankcase due to the presence of a partition wall between the cylinders, a counterweight portion of the crankshaft, etc., the blow-by gas is sucked into at least two mounting members located on both sides of the partition wall. By forming the passage, it is possible to efficiently reduce the blow-by gas that is substantially uniform throughout the entire crankcase.

  In the blow-by gas reduction device having the configuration described in (1) to (4) above, (5) the first attachment member and the second attachment member are outer wall portions on the crankcase side of the internal combustion engine. It is preferable that the remaining third mounting member among the plurality of mounting members is fastened and fixed to the cylinder head side from the outer wall portion on the crankcase side of the internal combustion engine.

  With this configuration, the fastening and fixing of the separator to the internal combustion engine is strong by the first to third mounting members.

  In the blowby gas reducing apparatus having the configuration described in (5) above, (6) at least two adjacent mounting members among the first mounting member, the second mounting member, and the third mounting member. Are preferably connected together.

  With this configuration, the fastening operation is facilitated, and the coupling between the separator and the plurality of attachment members is facilitated.

  According to the present invention, the piping operation of the separator can be executed simultaneously with the reliable mounting of the separator to the internal combustion engine using the plurality of mounting members only by fastening and fixing the plurality of mounting members to the block forming the outer wall of the internal combustion engine. As a result, the assembly work and piping of the separator are not time-consuming, and the blow-by gas suction passage and a part of the liquid drain passage are formed on the block side, and the mounting member is fastened and fixed. Therefore, it is possible to provide a blow-by gas reduction device that allows the block to be shared even with separators having simple shapes and different specifications.

It is a perspective view before the assembly | attachment of the cylinder block and separator of an internal combustion engine which are the principal parts of the blow-by gas reduction apparatus of the internal combustion engine which concerns on one Embodiment of this invention. 1 is a schematic configuration diagram of an engine equipped with a blow-by gas reduction device for an internal combustion engine according to an embodiment of the present invention. It is a schematic block diagram of the separator of the blow-by gas reduction apparatus of the internal combustion engine which concerns on one Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  1 to 3 are views showing a blow-by gas reduction device according to an embodiment of the present invention, and FIG. FIG. 2 shows a schematic configuration of an engine equipped with the blow-by gas reduction device, and FIG. 3 shows a schematic configuration of the separator.

  First, the configuration will be described.

  The blow-by gas reduction apparatus of the present embodiment is shown in FIG. 1 as an external appearance of its cylinder block, and in FIG. 2, a series multi-cylinder internal combustion engine such as a 4-cycle gasoline engine (hereinafter simply referred to as an engine) 10 whose schematic configuration is shown. Equipped with.

  As shown in FIG. 2, the engine 10 includes a head cover 11, a cylinder head 12, a cylinder block 13, and a crankcase 14 in order from above, and a plurality of cylinders 13 a (in FIG. 2). A plurality of cylinders 15 are formed. Here, the head cover 11, the cylinder head 12, the cylinder block 13, and the crankcase 14 constitute a block (engine block) that forms the outer wall of the engine 10, and the cylinder block 13 is a main part thereof.

  A plurality of pistons 16 are accommodated in the plurality of cylinders 15, respectively, and although not shown in detail, a crankshaft 17 in the crankcase 14 is connected to each piston 16 via a connecting rod 18. An oil pan 19 is provided at the lower part of the crankcase 14, and contains engine oil for lubrication and cooling (hereinafter simply referred to as oil) (not shown).

  A known valve operating mechanism 20 and ignition device 23 are accommodated inside the head cover 11 and the cylinder head 12, and the valve operating mechanism 20 is driven based on power from the crankshaft 17. . The engine 10 is provided with an oil pump (not shown) that is driven based on the power of the crankshaft 17. The oil pump pumps oil from the oil pan 19 and camshafts 21 and 22 of the valve mechanism 20. Etc., or each rotating / sliding portion such as a bearing portion of the crankshaft 17 is lubricated and cooled.

  In addition, air is sucked into the combustion chamber 10a formed in the upper part of the piston 16 in each cylinder 15 through the intake passage 31 and the intake port 10b according to the stroke of the piston 16, and combustion in the combustion chamber 10a occurs. The later exhaust gas is exhausted to the outside of the engine 10 through the exhaust port 10c and an exhaust passage (not shown).

  As shown in FIG. 2, the intake passage 31 includes a throttle body 33 that accommodates the throttle valve 32 so that the throttle valve 32 can be opened and closed, an upstream intake pipe 34 provided on both sides of the throttle body 33 in the intake direction, and a downstream intake air. And a tube 35. An air cleaner 36 having a filter element 36f is provided on the upstream side of the upstream intake pipe 34. The air from which dust or the like has been removed by the air cleaner 36 is taken into the intake pipe 34 on the upstream side. The downstream intake pipe 35 is formed integrally with the surge tank 37 and is fastened and fixed to the cylinder head 12 forming the intake port 10 b of the engine 10. A fuel injection valve 24 is mounted near the intake port 10b of the cylinder head 12 to which the downstream intake pipe 35 is fixed.

  On the other hand, since blow-by gas leaks from the combustion chamber 10a through the gap between the cylinder 13a and the piston 16 into the internal space of the crankcase 14, the engine oil is deteriorated, corrosion inside the engine 10 is prevented, and the like. Therefore, the PCV blowby gas reduction device of the present embodiment for forcibly ventilating the inside of the crankcase 14 is equipped.

  As shown in FIG. 2, the engine 10 is formed with at least one ventilation passage 10 v that connects the inner space of the head cover 11 and the cylinder head 12 that houses the valve mechanism 20 and the inner space of the crankcase 14. ing. Further, between the engine 10 and the intake pipe 34 on the upstream side, an air introduction pipe 41 that introduces fresh air from the intake passage 31 a upstream of the throttle valve 32, that is, new air directly into the engine 10. Is interposed between the engine 10 and the intake pipe 35 on the downstream side, and the blow-by gas generated inside the cylinder block 13 and the crankcase 14 is recirculated to the intake passage 31b on the downstream side of the throttle valve 32. The blow-by gas recirculation pipe 42, the PCV valve 43 that can open and close the recirculation passage in the blow-by gas recirculation pipe 42, and the mist-like liquid component contained in the blow-by gas in the blow-by gas recirculation pipe 42, mainly the oil component. An oil separator 45 that captures and collects is interposed.

  For example, as schematically shown in FIG. 3, the oil separator 45 is positioned on the lower side in the case 51 and a plurality of upper vertical wall portions 52 a, 52 b, 52 c positioned on the upper side in the case 51. A pair of gas-liquid separation passages 54a and 54b (which has a plurality of lower vertical wall portions 53a and 53b slightly spaced from the inner bottom portion 51b of the case 51 and meanders on both sides of the central upper vertical wall portion 52b ( Gas-liquid separation chamber).

  The gas-liquid separation passages 54a and 54b are folded up and down and extend from blow-by gas suction passages 55a and 55b (blow-by gas suction passages) on both ends in the longitudinal direction of the case 51 toward the center in the longitudinal direction. An oil drain passage 56 (liquid drain passage) is formed in the lower portion of the case 51 on the center side in the longitudinal direction.

  The oil drain passage 56 allows the liquid, mainly oil, collected on the inner bottom 51b side of the case 51 of the oil separator 45 to flow down to the inside of the crankcase 14 (inside the internal combustion engine). Further, a reflux gas discharge passage 57 is formed on the upper side of the case 51 in the longitudinal direction center side to the blow-by gas surge tank side. In addition, the separator system itself of such an oil separator 45 is not specifically limited, Various well-known oil separators, such as a cyclone system, can be employ | adopted.

  The blow-by gas intake passages 55a and 55b have a plurality of, for example, three passage hole portions 58 (in FIG. 2) formed in a part of the skirt portion 13s (outer wall portion on the crankcase side) of the cylinder block 13 forming the outer wall of the engine 10. A pair of passage hole portions communicating with the blow-by gas suction passages 55a and 55b among these passage hole portions 58. 58 is spaced apart on both sides of a partition wall 10r (detailed shape not shown) provided between any pair of cylinders 15 in the engine 10. The oil drain passage 56 allows the collected and recovered liquid to flow into the crankcase 14 through the remaining one passage hole 58 of the three passage holes 58 formed in the cylinder block 13 of the engine 10. It is supposed to let you.

  As shown in FIG. 1, the oil separator 45 is fastened and fixed to the cylinder block 13 forming the outer wall of the engine 10 by a plurality of mounting members 61, 62, 63, 64 and a plurality of sets of fastening bolts (not shown).

  Among the plurality of mounting members 61 to 64, a pair of mounting members 61 and 62 (at least two mounting members) adjacent immediately below the oil separator 45 are brackets 66 that hinder the lower portion of the oil separator 45 at the respective upper ends. Are integrally connected to each other. And, on the lower end side of the pair of attachment members 61, 62, fastening flange portions 61f, 62f with a pair of bolt holes are provided.

  The first attachment member 63 located on the side of the oil separator 45 among the plurality of attachment members 61 to 64 is formed in a tubular shape, and is fixed to the side wall of the oil separator 45 on the upper end side thereof, and on the lower end side thereof. A fastening flange portion 63f with a pair of bolt holes having a substantially elliptical shape or a substantially diamond shape is provided. The upper third mounting member 64 among the plurality of mounting members 61 to 64 is configured by a plate-like body fixed to the back surface of the oil separator 45, and oil is provided at both left and right ends in FIG. A pair of projecting portions 64 a and 64 b with bolt holes projecting upward from the separator 45 are provided.

  On the other hand, blow-by gas intake passages 55a and 55b extending from the inside of the engine 10 to the inside of the oil separator 45 and an oil drain passage 56 extending from the oil separator 45 to the inside of the engine 10 are respectively connected to the cylinder block 13 of the engine 10 in the oil separator. Among the plurality of mounting members 61 to 64 for fastening and fixing 45, the first mounting members 61 and 63 and the second mounting member 62 corresponding to the passages 55a, 55b and 56 are passed through. .

  More specifically, the first mounting members 61 and 63 have passage hole portions 61w and 63w that respectively form blow-by gas suction passages 55a and 55b, and ends of the passage hole portions 61w and 63w. The portion is surrounded by the fastening flange portions 61f and 63f. Further, the second mounting member 62 has a passage hole 62w that forms an oil drain passage 56, and the passage hole 62w is surrounded by a fastening flange portion 62f.

  The first mounting members 61, 63 and the second mounting member 62 are separated from each other in the arrangement direction of the cylinders 15 of the engine 10, and the partition wall 10 r (between any pair of cylinders 15 provided inside the engine 10). The detailed shape is not shown) on both sides. The first mounting members 61 and 63 and the second mounting member 62 are substantially elliptical or substantially rhombic convex lower mounting portions 71 and 73, which are outer wall portions on the crankcase 14 side of the engine 10, respectively. The remaining third mounting member 64 among the plurality of mounting members 61 to 64 is a substantially circular convex shape that is an outer wall portion on the cylinder head 12 side from these lower mounting portions 71 to 73. The upper mounting portion 74 and a similar mounting portion (not shown) having the same protruding height and vertical height position (hereinafter referred to as the upper mounting portion 74 together) are fastened and fixed.

  Between the fastening flange portions 61f to 63f of the plurality of attachment members 61 to 63 and the lower attachment portions 71 to 73 of the engine 10, gaskets (not shown) are respectively interposed. Between the parts 64a and 64b and the upper attachment part 74, etc., for example, washers having excellent elasticity are interposed.

  The materials of the plurality of mounting members 61 to 64 are not particularly limited. However, as long as the strength does not greatly decrease or deteriorate due to the outer wall temperature of the engine 10, the mounting members 61 to 64 are made of a resin having excellent heat resistance (for example, Thermosetting).

  Next, the operation will be described.

(When assembling the separator)
In the blowby gas reduction device of the present embodiment configured as described above, the plurality of attachment members 61 to 64 are used by fastening and fixing the plurality of attachment members 61 to 64 to the outer wall portion of the engine 10. When the oil separator 45 is attached to the engine 10, blow-by gas intake passages 55a and 55b extending from the inside of the engine 10 into the oil separator 45, and an oil drain passage 56 extending from the oil separator 45 to the inside of the engine 10 However, it passes through the inside of the corresponding first mounting members 61 and 63 and the second mounting member 62, and is formed as a passage. Therefore, the reliable attachment of the oil separator 45 to the engine 10 and the piping work of the oil separator 45 can be performed at the same time, and troublesome piping work becomes unnecessary.

  Moreover, on the cylinder block 13 side of the engine 10, blow-by gas intake passages 55a and 55b and a part of the oil drain passage 56 are formed, and a lower attachment is a portion to which a plurality of attachment members 61 to 64 are fastened and fixed. It is only necessary to form the parts 71 to 73 and the upper mounting part 74, and the cylinder block 13 of the engine 10 can be shared with an oil separator having different specifications from the oil separator 45. Therefore, the productivity of the engine 10 is improved.

  Further, in the present embodiment, the first attachment members 61 and 63 and the second attachment member 62 each include a passage hole 61w that forms one of the blow-by gas intake passages 55a and 55b and the oil drain passage 56, respectively. 63w and 62w, and fastening flange portions 61f to 63f surrounding the passage hole portions 61w to 63w, the blow-by gas suction passages 55a and 55b or the oil drain passage 56 can be easily provided in the mounting members 61 to 63. And the required rigidity of each of the mounting members 61 to 63 can be easily secured.

  Furthermore, since the engine 10 is an in-line multi-cylinder internal combustion engine and the first mounting members 61 and 63 and the second mounting member 62 are separated from each other in the cylinder arrangement direction of the engine 10, the first mounting member 61 is arranged in the cylinder arrangement direction. The attachment members 61 and 63 and the second attachment member 62 can be sufficiently separated from each other, and the separator 45 can be reliably supported by these attachment members 61 to 63. In addition, the first mounting members 61 and 63 and the second mounting member 62 are disposed on both sides of the partition wall 10r between the cylinders 15 provided in the engine 10 in the cylinder arrangement direction. Even if the blow-by gas hardly flows into the crankcase 14 due to the presence of the partition wall 10r, the counterweight portion 17cw of the crankshaft 17, etc., the blow-by gas is blown to at least two mounting members 61, 63 located on both sides of the partition wall 10r. By forming the gas intake passages 55a and 55b, the blow-by gas can be discharged to the intake side substantially uniformly and reliably in the entire area of the crankcase 14. Therefore, efficient blow-by gas reduction can be performed.

  In addition, the first attachment members 61, 63 and the second attachment member 62 are provided on the outer wall portion of the engine 10 on the crankcase 14 side, that is, the lower attachment portion 71 provided in a convex shape on the skirt portion 13 s of the cylinder block 13. The upper third mounting member 64 among the plurality of mounting members 61 to 64 is fixed above the lower mounting portions 71 to 73, that is, on the cylinder head 12 side. Since it is fastened and fixed to the part 74 and the like, the fastening of the oil separator 45 to the engine 10 is strong by the first to third mounting members 61 to 63. Further, among the first mounting members 61 and 63, the second mounting member 62 and the third mounting member 64, at least two adjacent mounting members 61 and 62 are integrally connected to each other as a bracket 66. The fastening operation is facilitated and the coupling between the oil separator 45 and the plurality of attachment members 61 to 63 is also facilitated.

(Blow-by gas reduction during operation)
On the other hand, when the engine 10 in which the assembly of the oil separator 45 is completed is operated, when fresh air is introduced into the interior space of the head cover 11 and the cylinder head 12 inside the engine 10, the fresh air is introduced into the ventilation passage. It is introduced into the crankcase 14 through 10v. At this time, the blow-by gas leaking from each cylinder 15 into the crankcase 14 is introduced into the oil separator 45 from the crankcase 14 through the blow-by gas introduction passages 55a and 55b and a pair of passage hole portions 58 corresponding thereto. The The blow-by gas separated and recovered in the oil separator 45 is supplied with the reflux gas discharge passage 57 and the blow-by gas reflux when the PCV valve 43 is opened according to the pressure difference between both ends of the blow-by gas reflux pipe 42. It is sent out into the low-pressure surge tank 37 through the passage in the pipe 42, and returns to the intake passage 31 b on the downstream side of the throttle valve 32.

  When the opening degree of the throttle valve 32 reaches an opening degree in a high load range exceeding the specific opening degree, the engine 10 becomes high speed, the negative pressure in the intake passage 31a on the upstream side increases, and before and after the throttle valve 32 And the amount of blow-by gas generated inside the engine 10 also increases, so that fresh air is not taken into the engine 10 from the air introduction pipe 41 and blow-by through the air introduction pipe 41 to the intake passage 31 side. It will also be in the state where gas flows backward.

  As described above, in the present embodiment, the plurality of mounting members 61 to 64 are simply fastened and fixed to the block forming the outer wall of the engine 10, for example, the cylinder block 13 forming the main part thereof. Since the operation of installing the oil separator 45 to the used engine 10 is performed simultaneously with the operation of piping the oil separator 45, the assembly work and piping of the oil separator 45 are not troublesome, and the cylinder block 13 On the side, passage holes 58 forming a part of the blow-by gas suction passages 55a and 55b and the oil drain passage 56 are formed, and the lower attachment portions 71 to 73 and the upper portions to which a plurality of attachment members 61 to 64 are fastened and fixed. It is only necessary to form the mounting part 74, and cylinder blocks can be used for oil separators with different specifications. 3 is capable of providing positive crankcase ventilation apparatus having excellent productivity and to be shared.

  In the above-described embodiment, the engine 10 has been described as a port injection type, but it goes without saying that the present invention can be applied to a cylinder injection type engine or a dual injection type engine. The oil separator 45 has two blow-by gas intake passages 55a and 55b. However, a plurality of blow-by gas intake passage holes 58 spaced in the cylinder arrangement direction are formed on the cylinder block 13 side of the engine 10. On the other hand, in the bracket 66 in which the plurality of mounting members 61 and 62 are integrated, a plurality of branch passage portions connected to the plurality of passage hole portions 58 and a set in which they are combined and connected to one suction port of the oil separator 45 A blow-by gas suction passage having a passage portion can also be formed.

  In the above-described embodiment, the oil separator 45 is fastened and fixed to the cylinder block 13 via a plurality of mounting members 61 to 64 that are separate from the oil separator 45. Needless to say, at least one of 61 to 64 may be formed integrally with the oil separator 45.

  Furthermore, even if blow-by gas intake passages are formed in the pair of attachment members 61 and 62 adjacent to each other and integrated with the bracket 66 among the three attachment members 61 to 63 fastened to the lower attachment portions 71 to 73. Alternatively, an oil drain passage may be formed in the remaining attachment member 63. Further, in the above-described embodiment, the plurality of attachment members 61 to 64 are all fastened to the outer wall portion of the cylinder block 13, but part or all of the lower attachment portions 71 to 73 are other than the engine block. It is also conceivable that the upper mounting portion 74 may be connected to the cylinder head 12 which is another part of the engine block.

  As described above, the blow-by gas reduction device according to the present invention can reliably attach the separator to the internal combustion engine using the plurality of attachment members by simply fastening and fixing the plurality of attachment members to the block forming the outer wall of the internal combustion engine. At the same time, the separator piping work can be executed, so that the assembly work and piping of the separator are not troublesome, and the blow-by gas intake passage and part of the liquid drain passage are provided on the block side of the internal combustion engine. It is only necessary to form a portion where the mounting member is fastened and fixed, and it is possible to provide a blow-by gas reduction device that can share the block even for separators having different specifications. A blower for an internal combustion engine in which a separator for gas-liquid separation such as an oil separator is arranged on a return passage to a gas intake system. It is useful to Baigasu reduction devices in general.

10 Engine (Internal combustion engine)
10r Bulkhead 10v Ventilation passage 11 Head cover (block that forms the outer wall of the internal combustion engine)
12 Cylinder head (block that forms the outer wall of the internal combustion engine)
13 Cylinder block (block that forms the outer wall of the internal combustion engine)
13s Skirt (outer wall on the crankcase side)
14 Crankcase (block that forms the outer wall of the internal combustion engine)
15 cylinder 17 crankshaft 31 intake passage 32 throttle valve 34 upstream intake pipe 35 downstream intake pipe 37 surge tank 41 air introduction pipe 42 blow-by gas recirculation pipe 43 PCV valve 45 oil separator (separator)
51 Case 51b Inner bottom 54a, 54b Gas-liquid separation passage (gas-liquid separation chamber)
55a, 55b Blow-by gas suction passage (blow-by gas suction passage)
56 Oil drain passage 57 Reflux gas discharge passage 58, 61w, 62w, 63w Passage hole 58a, 58b Suction passage 61, 63 First attachment member 61f, 62f, 63f Fastening flange portion 62 Second attachment member 64 Third attachment Mounting member 64a, 64b Suspended portion 66 Bracket 71, 72, 73 Lower mounting portion (outer wall portion on the crankcase side)
74 Upper mounting part (outer wall part on the cylinder head side)

Claims (6)

The blow-by gas generated inside the internal combustion engine is recirculated to the intake side of the internal combustion engine, and a mist-like liquid component contained in the blow-by gas is captured and recovered by a separator having a gas-liquid separation chamber. In the blow-by gas reduction device for an internal combustion engine that causes the recovered liquid to flow down into the internal combustion engine,
The blow-by gas suction passage from the inside of the internal combustion engine to the separator and the drain passage for the liquid from the separator to the inside of the internal combustion engine respectively form a block that forms an outer wall of the internal combustion engine. A blow-by gas reduction device for an internal combustion engine, wherein the blow-by gas reduction device passes through the corresponding first mounting member and second mounting member among the plurality of mounting members for fastening and fixing the motor.   The first attachment member and the second attachment member each form a passage hole portion that forms one of the suction passage for the blow-by gas and the drain passage for the liquid; and a fastening flange portion surrounding the passage hole portion. The blow-by gas reduction device for an internal combustion engine according to claim 1, wherein   The internal combustion engine is an in-line multi-cylinder internal combustion engine, and the first mounting member and the second mounting member are separated from each other in the arrangement direction of the cylinders of the internal combustion engine. Item 3. The blow-by gas reduction device for an internal combustion engine according to Item 2.   The first mounting member and the second mounting member are located on both sides of a partition wall between cylinders provided in the internal combustion engine in an arrangement direction of the cylinders of the internal combustion engine. 4. A blow-by gas reduction device for an internal combustion engine according to claim 3.   The first mounting member and the second mounting member are fastened and fixed to an outer wall portion on the crankcase side of the internal combustion engine, and the remaining third mounting member among the plurality of mounting members is the internal combustion engine. The blow-by gas reduction device for an internal combustion engine according to any one of claims 1 to 4, wherein the blow-by gas reduction device according to any one of claims 1 to 4, wherein the blow-by gas reduction device is fastened and fixed to the cylinder head side from an outer wall portion on the crankcase side.   6. The internal combustion engine according to claim 5, wherein at least two adjacent mounting members among the first mounting member, the second mounting member, and the third mounting member are integrally connected to each other. Engine blow-by gas reduction device.

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