JP6136530B2 - Blow-by gas collection system - Google Patents

Description

  The present invention relates to a blow-by gas collection system.

  2. Description of the Related Art Conventionally, there is known a blow-by gas collection system that guides (returns) blow-by gas, which is unburned gas leaked from a gap between a piston and a cylinder, to intake air introduced into a cylinder of an engine (see, for example, Patent Document 1). .

  In the above-mentioned Patent Document 1, a structure is provided in which a chain cover is provided on one side portion of an engine, and blow-by gas is guided to intake air introduced into an engine cylinder through a passage provided in the chain cover (blow-by gas collection system). ) Is disclosed. In this configuration, an opening is provided in the lower part of the chain cover passage, and blow-by gas in the engine is sucked (sucked) into the passage of the chain cover through the opening.

JP 2003-41922 A

  However, in the configuration of the above-mentioned Patent Document 1 (blow-by gas collection system), the blow-by gas in the engine passes through the opening of the lower part of the passage of the chain cover provided on one side of the engine. Therefore, when the engine has a plurality of cylinders, compared to the cylinder at a position relatively close to the one side of the engine provided with the chain cover (front side), The blow-by gas discharged from the cylinder at a position relatively far from the side on the one side of the engine (back side) is difficult to suck out (suck) into the passage of the chain cover, because it is far from the opening of the passage. . For this reason, it is considered that there is a problem that the ventilation performance of the blow-by gas discharged from the cylinder far from the opening of the passage of the chain cover is deteriorated.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to improve the ventilation of blow-by gas discharged from any of a plurality of cylinders. Provide a blowby gas collection system.

In order to achieve the above object, a blow-by gas collection system according to a first aspect of the present invention is provided below a plurality of cylinders of an internal combustion engine so as to extend in the arrangement direction of the plurality of cylinders, and discharges from the plurality of cylinders. a first passage comprising an inlet port blow-by gas is sucked to be, the blow-by gas taken into the first passage from the inlet port, and a guide passage leading to the intake air introduced into the plurality of cylinders, a first passage the inlet port, that is configured to relatively open area as the upstream side of the blow-by gas flowing through the first passage is increased.

In the blowby gas collection system according to the first aspect of the present invention, as described above, the blowby gas discharged from the plurality of cylinders extends below the plurality of cylinders of the internal combustion engine so as to extend in the arrangement direction of the plurality of cylinders. By providing the first passage including the suction port to be sucked, the blow-by gas discharged from any of the plurality of cylinders, regardless of the position on the near side or the back side in the arrangement direction of the cylinders, Since the intake can be effectively taken into (suctioned into) the first passage through the inlet of the first passage extending in the arrangement direction of the cylinders, the blow-by gas suction amount (ventilation amount) varies depending on the position in the internal combustion engine. Can be suppressed. Thereby, the ventilation property of the blow-by gas discharged | emitted from any cylinder of a some cylinder can also be improved. Further, since the opening area is increased on the upstream side (back side) where the pressure loss is likely to increase due to the length of the path, it is possible to suppress the upstream pressure loss from increasing. Thereby, it is possible to suppress variation in the amount of blow-by gas taken in (suctioned) between the front side (downstream side) and the back side (upstream side) of the first passage extending in the arrangement direction of the plurality of cylinders. Variations in ventilation performance of blow-by gas depending on the position in the engine can be suppressed.
The blow-by gas collection system according to the second aspect of the present invention is provided below the plurality of cylinders of the internal combustion engine so as to extend in the arrangement direction of the plurality of cylinders, and the blow-by gas discharged from the plurality of cylinders is sucked. A first passage including a suction port; and a guide passage that guides the blow-by gas taken into the first passage from the suction port to the intake air introduced into the plurality of cylinders. A plurality of suction ports of the first passage are provided. The inlet area provided on the upstream side of the blow-by gas flowing through the first passage has a relatively large opening area.
In the blowby gas collection system according to the second aspect of the present invention, as described above, the blowby gas discharged from the plurality of cylinders extends below the plurality of cylinders of the internal combustion engine so as to extend in the arrangement direction of the plurality of cylinders. By providing the first passage including the suction port to be sucked, the blow-by gas discharged from any of the plurality of cylinders, regardless of the position on the near side or the back side in the arrangement direction of the cylinders, Since the intake can be effectively taken into (suctioned into) the first passage through the inlet of the first passage extending in the arrangement direction of the cylinders, the blow-by gas suction amount (ventilation amount) varies depending on the position in the internal combustion engine. Can be suppressed. Thereby, the ventilation property of the blow-by gas discharged | emitted from any cylinder of a some cylinder can also be improved. Even when a plurality of suction ports are provided in the first passage, they are taken in by the front (downstream) suction port and the back (upstream) suction port of the first passage extending in the arrangement direction of the plurality of cylinders. Since it is possible to suppress variation in the pressure loss of the (by suction) blow-by gas, it is possible to further suppress variation in the suction amount (ventilation amount) of the blow-by gas depending on the position in the internal combustion engine.

In the blow-by gas collection system according to the first or second aspect, preferably, a plurality of intake ports are provided so as to correspond to at least a plurality of cylinders. If comprised in this way, the blow-by gas discharged | emitted from any cylinder of a some cylinder can be more effectively attracted | sucked via the some suction port corresponding to each of a some cylinder.

In the blow-by gas collection system according to the first or second aspect, preferably, the guide passage is provided in the timing chain cover of the internal combustion engine, and is provided in the second passage connected to the first passage and the head cover of the internal combustion engine. And a third passage connected to the second passage. If comprised in this way, the blow-by gas taken in into the 1st channel | path via the inlet port of the 1st channel | path will be guide | induced to the intake air easily introduce | transduced into a some cylinder via a 2nd channel | path and a 3rd channel | path ( Can return).

  In this case, preferably, the first oil separator is provided in the second passage and separates the oil mist contained in the blow-by gas taken into the first passage, and the third oil passage is provided in the first passage. The oil mist contained in blow-by gas is further provided with a second oil separator that separates an oil mist having a smaller diameter than the first oil separator. If comprised in this way, both small diameter and large diameter oil mist can be isolate | separated from the blow-by gas taken in into the 1st channel | path using two oil separators, a 1st oil separator and a 2nd oil separator. Therefore, compared to a configuration with only one oil separator, blow-by gas can be guided to the intake air with the oil mist removed more accurately, and as a result, the amount of oil taken into the intake air (consumption) can be reduced. Can be reduced.

  In this case, preferably, a plurality of suction ports are provided, and the suction port provided on the upstream side of the blow-by gas flowing through the first passage has a relatively larger opening area. With this configuration, even when a plurality of suction ports are provided in the first passage, the suction ports on the near side (downstream side) and the back side (upstream side) of the first passage extending in the arrangement direction of the plurality of cylinders. Since it is possible to suppress the pressure loss of the blow-by gas taken in (inhaled) from the intake port, it is possible to further suppress the blow-off gas suction amount (ventilation amount) from varying depending on the position in the internal combustion engine. .

  In the configuration including the first oil separator and the second oil separator, preferably, the second passage is at least partially configured by a timing chain cover of the internal combustion engine, and the first oil separator is provided in the second passage. The blow-by gas taken into the first passage collides with the rib in the second passage, thereby separating oil mist having a diameter larger than that of the second oil separator. With this configuration, the timing chain cover can be diverted as a part of the second passage, so that the increase in the number of parts can be suppressed unlike the case where the second passage is configured with only a dedicated member. it can. In addition, by configuring the first oil separator with ribs, it is possible to separate large-diameter oil mist with a simple configuration.

  In the configuration in which the guide passage includes the second passage and the third passage, preferably, the second passage is configured by a timing chain cover and a partition member provided inside the timing chain cover, and the partition member is At least a part of the surface on the side opposite to the second passage on which the timing chain is arranged is formed flat, and the oil falling from the upper part of the internal combustion engine is collected and collected on the upper part of the partition member An oil receiving portion is provided for guiding the oil to the flat portion of the surface of the partition wall member. If comprised in this way, while being able to collect efficiently the oil which falls from the upper part of an internal combustion engine with an oil receiving part, it rectifies the collected oil along the flat part of the surface of a partition member, and is below Since the oil can be guided to the oil reservoir (oil pan), bubbles can be prevented from being mixed into the oil in the oil reservoir. As a result, the oil supply hydraulic pressure can be stabilized and deterioration of the oil can be suppressed.

In the blowby gas collection system according to the first or second aspect, preferably, the suction port is formed in a lower portion of the first passage. According to this configuration, unlike the case where the suction port is formed in the upper portion of the first passage, oil falling from above due to its own weight can be prevented from entering the first passage through the suction port. It is possible to suppress the oil from being mixed into the blow-by gas taken into one passage.

In the blow-by gas collection system according to the first or second aspect, preferably, the first passage is within the crankcase of the internal combustion engine, below the plurality of cylinders, and lower than the oil reservoir at the lower portion of the crankcase. It is arranged at an upper position. If comprised in this way, since the blowby gas in a crankcase can be effectively sucked out (suction) through the inlet of a 1st channel | path, the ventilation in a crankcase in which the density | concentration of a blowby gas tends to become high. Can be improved.

In the blowby gas collection system according to the first or second aspect, preferably, the first passage is constituted by a pipe member formed separately from the main body of the internal combustion engine. If comprised in this way, unlike the case where a 1st channel | path is integrally formed with the main-body part of an internal combustion engine, even after forming the main-body part of an internal combustion engine, it is the arrangement | sequence of a some cylinder below a several cylinder A first passage extending in the direction can be easily provided.

  In the present application, in addition to the blow-by gas collection system according to the above aspect, the following other configurations are also conceivable.

(Additional item 1)
That is, a blow-by gas collection system according to another configuration of the present application includes a passage that guides blow-by gas discharged from a plurality of cylinders to intake air that is introduced into the plurality of cylinders, and a blow-by gas that is provided in the passage and is taken into the passage. A first oil separator that separates oil mist contained in the gas, and an oil mist that is provided in the passage and contained in the blow-by gas taken into the passage, separates oil mist having a smaller diameter than the first oil separator. 2 oil separator. If comprised in this way, since the oil mist of both small diameter and large diameter can be separated from the blow-by gas taken in the passage using the two oil separators of the first oil separator and the second oil separator, Compared to a configuration in which only one oil separator is provided, blow-by gas can be guided to intake air with oil mist removed more accurately, and as a result, the amount of oil taken away (consumption) into intake air is reduced. be able to.

(Appendix 2)
In the blowby gas collection system according to the other configuration described above, preferably, the first oil separator includes an inertial collision type separator, and the second oil separator is provided in the passage on the downstream side of the first oil separator. Includes a separator. If comprised in this way, after separating oil mist of large diameter with an inertial collision type separator, oil mist of small diameter can be separated with a cyclone separator, so that oil mist can be efficiently separated from blow-by gas. it can.

  According to the invention according to the above aspect, as described above, the ventilation performance of the blow-by gas discharged from any one of the plurality of cylinders can be improved.

It is the schematic which showed the structure of the blowby gas collection system by one Embodiment of this invention. It is a perspective view in the state where a part of blowby gas collection system by one embodiment of the present invention was cut. It is the top view which showed the arrangement state of the 1st channel | path of the blowby gas collection system by one Embodiment of this invention. It is sectional drawing along the 200-200 line | wire of FIG. It is the figure which looked at the chain cover of the blowby gas collection system by one Embodiment of this invention from the inside. It is the figure which showed the inlet of the blowby gas collection system by the modification of one Embodiment of this invention.

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

  With reference to FIGS. 1-5, the structure of the blowby gas collection system 100 by one Embodiment of this invention is demonstrated.

  A blow-by gas collection system 100 according to an embodiment of the present invention is a blow-by gas collection system for an automobile engine (internal combustion engine) 10 as shown in FIG. Further, the blow-by gas collection system 100 guides blow-by gas (PCV (Positive Crankcase Ventilation) gas) discharged (leaked) from the four cylinders 10a of the engine 10 to intake air introduced into the four cylinders 10a. It is configured. Structurally, the engine 10 includes an engine body 20 including a cylinder head 20a, a cylinder block 20b, and a crankcase 20c. A metal (for example, aluminum) timing chain cover 40 that covers the timing chain 30 is attached to one side (X1 direction side) of the engine body 20 and the cylinder head 20a. A resin head cover 50 is attached to the upper side. The cylinder head 20a is connected to a resin intake device 60 that introduces intake air into each of the four cylinders 10a. The engine main body 20 is an example of the “main body” in the present invention.

  The engine 10 is an in-line four-cylinder engine in which four cylinders 10a are arranged in a line in a predetermined direction (X direction). The cylinder head 20a is provided on the upper side (Z1 direction side) of the cylinder block 20b, and the crankcase 20c is provided on the lower side (Z2 direction side) of the cylinder block 20b. Further, most of the blow-by gas is discharged (leaks out) from the lower portions of the four cylinders 10a. An oil reservoir 70 for accumulating engine oil is provided at the lower part of the crankcase 20c. The engine oil is pumped up from the oil reservoir 70 to the upper part of the engine 10 by an oil pump (not shown), lubricates each part, and then falls by its own weight and returns to the oil reservoir 70. That is, the engine 10 corresponds to the wet sump method.

  Here, in this embodiment, the blow-by gas collection system 100 includes a first passage 1 provided in the crankcase 20c, a second passage 2 provided in the timing chain cover 40, and a first passage provided in the head cover 50. 3 passages 3 are provided. The blow-by gas collection system 100 is configured to guide the blow-by gas inside the engine 10 to the intake air introduced into the four cylinders 10a through the first passage 1, the second passage 2, and the third passage 3. . The second passage 3 and the third passage 3 are examples of the “guide passage” in the present invention.

  Specifically, as shown in FIGS. 1 to 4, the first passage 1 is provided below the four cylinders 10 a so as to extend in the arrangement direction (X direction) of the four cylinders 10 a. That is, the first passage 1 extends from one side (front side (X1 direction side)) of the engine body 20 where the timing chain cover 40 is provided to the other side (back side (X2 direction side)) in the arrangement direction of the cylinders 10a. It is formed to extend toward. As shown in FIGS. 1, 2, and 4, the first passage 1 is disposed in the crankcase 20 c below the four cylinders 10 a and above the oil reservoir 70. The first passage 1 is constituted by a resin or metal pipe member 1 a formed separately from the engine body 20. The pipe member 1a is formed in the crankcase 20c so as not to interfere with a crankshaft or a connecting rod (not shown), and at a position where it does not interfere with the crankshaft or the connecting rod (a position avoiding the crankshaft or the connecting rod). Has been placed.

  The first passage 1 is provided with four suction ports 11a, 11b, 11c and 11d for sucking blow-by gas discharged from the four cylinders 10a into the first passage 1. The blow-by gas collection system 100 converts the blow-by gas taken (intaken) into the first passage 1 from the four suction ports 11a to 11d into the intake air introduced into the four cylinders 10a by the second passage 2 and the third passage 3. It is configured to guide. The blow-by gas is sucked into the first passage 1 by the negative pressure generated in the four cylinders 10a in accordance with the movement of a piston (not shown).

  The four suction ports 11a to 11d are provided at positions corresponding to the four cylinders 10a. The four suction ports 11a to 11d are configured such that the opening area becomes relatively larger toward the upstream side of the blow-by gas flowing through the first passage 1. That is, the four suction ports 11a to 11d are arranged from one side (front side (X1 direction side)) of the engine body 20 where the timing chain cover 40 is provided to the other side (back side (X2 direction side) of the arrangement direction of the cylinders 10a. )) The opening area becomes larger in order. The four suction ports 11a to 11d are all formed in the lower part of the first passage 1 and open downward (Z2 direction). In other words, the four suction ports 11 a to 11 d are formed in the lower part of the pipe member 1 a constituting the first passage 1. The end 12 on the back side (X2 direction side) of the first passage 1 is closed, and the end 13 on the near side (X1 direction side) of the first passage 1 is connected to the second passage 2. Yes.

  As shown in FIGS. 1, 2, and 4, part of the second passage 2 is configured by a timing chain cover 40. Specifically, the second passage 2 includes a timing chain cover 40 and a metal (for example, iron) partition member 80 provided inside the timing chain cover 40. That is, the second passage 2 is configured by a space (gap) between the timing chain cover 40 and a plate-like partition member 80 provided so as to face the timing chain cover 40. As shown in FIGS. 4 and 5, the second passage 2 is connected to the first passage 1 at a circular opening 21 formed in the partition wall member 80 and via a connection passage 22 extending in the vertical direction. The head cover 50 is configured to be connected to the third passage 3.

  As shown in FIG. 5, the lower edge 801 of the partition wall member 80 has a shape that avoids a through hole 401 through which a drive shaft (not shown) of the timing chain cover 40 passes. Further, the upper edge portion 802 of the partition wall member 80 is positioned below a portion corresponding to the rotation shaft 302 (see FIG. 3) of the gear 301 around which the timing chain 30 is wound. In the partition member 80, a part of the surface 80a on the side (X2 direction side) where the timing chain 30 (see FIGS. 1 and 4) opposite to the side where the second passage 2 is disposed is formed flat. Has been. Specifically, a portion of the surface 80a of the partition wall member 80 that is located below an oil receiving portion 803 (described later) formed above the partition wall member 80 and above the through hole 401 is formed flat. ing.

  In the present embodiment, the second passage 2 is provided with an inertial collision type separator 4 that separates (removes) oil mist contained in the blow-by gas taken into the first passage 1. The inertial collision separator 4 is configured to function as a pre-oil separator that separates oil mist having a larger diameter than a cyclone separator 5 that functions as a later-described main oil separator provided in the third passage 3. Specifically, the inertial collision type separator 4 includes a plurality of ribs 41 provided in the second passage 2 as shown in FIGS. 2, 4, and 5. The plurality of ribs 41 are formed integrally with the partition wall member 80. Thus, the plurality of ribs 41 can function as reinforcing ribs for the plate-shaped partition wall member 80. In the inertial collision type separator 4, when blow-by gas flows through the second passage 2 toward the third passage 3 (upward), the blow-by gas collides with the plurality of ribs 41 in the second passage 2. Thus, the oil mist is separated. The inertial collision separator 4 is an example of the “first oil separator” in the present invention, and the cyclone separator 5 is an example of the “second oil separator” in the present invention.

  Specifically, as shown in FIG. 5, the plurality of ribs 41 are alternately (staggered) from the left and right sides (both sides in the Y direction) of the second passage 2 when viewed from the inside of the timing chain cover 40 (partition wall member 80 side). ) To be inclined downward (Z2 direction) toward the center of the second passage 2. As a result, the blow-by gas taken into the first passage 1 is sucked into the second passage 2 through the lower opening 21, and then the upper connection passage in the second passage 2 while changing the direction zigzag. To 22. With the configuration as described above, it is possible to separate the oil mist having a larger diameter than the later-described cyclonic separator 5 in the third passage 3 by the inertial collision separator 4 in the second passage 2.

  As shown in FIGS. 1, 4, and 5, an oil receiving portion 803 that collects engine oil falling from the upper portion of the engine 10 is provided on the upper portion of the partition member 80. As shown in FIG. 1, the oil receiving portion 803 is configured to guide the collected engine oil to a flat portion of the surface 80 a of the partition wall member 80. Specifically, as shown in FIGS. 1, 4, and 5, an opening 804 is formed in the lower portion of the oil receiver 803, and the engine oil collected in the oil receiver 803 It is guided to a flat portion of the surface 80a through 804.

  The third passage 3 is connected to the second passage 2 via the connection passage 22. As shown in FIGS. 1 and 4, the third passage 3 is provided with a cyclonic separator 5 that separates (removes) oil mist contained in the blow-by gas taken into the first passage 1. The cyclone separator 5 is configured to further separate a small diameter oil mist from the blowby gas in a state where the large diameter oil mist is separated by the inertial collision type separator 4 of the second passage 2. Specifically, the cyclonic separator 5 separates oil mist having a diameter smaller than that of the inertial collision separator 4 out of the oil mist contained in the blow-by gas taken into the first passage 1 by using centrifugal force. It is configured as follows. In other words, in the blow-by gas collection system 100 of the present embodiment, it is possible to separate small diameter and large diameter oil mist from blow-by gas by using two types of oil separators different from the inertial collision type separator 4 and the cyclonic separator 5. is there. The blow-by gas from which the oil mist is separated (removed) by the inertial collision separator 4 and the cyclone separator 5 is introduced into the intake air from a predetermined position of the intake device 60. On the other hand, the oil mist separated by the inertial collision separator 4 and the cyclone separator 5 becomes liquid and falls due to its own weight and returns to the oil reservoir 70.

  In the present embodiment, as described above, blow-by gas discharged from the plurality of cylinders 10a is sucked below the plurality of cylinders 10a of the engine 10 so as to extend in the arrangement direction (X direction) of the plurality of cylinders 10a. By providing the first passage 1 including the suction ports 11a to 11d, regardless of the position of the front side (X1 direction side) or the back side (X2 direction side) in the arrangement direction of the cylinders 10a among the plurality of cylinders 10a. Any blowby gas discharged from any of the cylinders 10a can be effectively taken into (suctioned into) the first passage 1 via the suction ports 11a to 11d of the first passage 1 extending in the arrangement direction of the plurality of cylinders 10a. Therefore, it is possible to suppress variation in the blow-by gas suction amount (ventilation amount) depending on the position in the engine 10. Thereby, the ventilation property of the blow-by gas discharged | emitted from any cylinder of the some cylinder 10a can also be improved.

  In the present embodiment, as described above, the plurality of suction ports 11a to 11d are provided at positions corresponding to the respective cylinders 10a. Thereby, the blow-by gas discharged | emitted from any cylinder of the some cylinder 10a can be more effectively attracted | sucked via the some inlet 11a-11d corresponding to each of the some cylinder 10a.

  In the present embodiment, as described above, the timing chain cover 40 of the engine 10 is provided with the second passage 2 connected to the first passage 1, and the head cover 50 of the engine 10 is connected to the second passage 2. A third passage 3 is provided. As a result, the blow-by gas taken into the first passage 1 via the suction ports 11 a to 11 d of the first passage 1 is easily introduced into the plurality of cylinders 10 a via the second passage 2 and the third passage 3. It can be led (returned) to inhalation.

  In the present embodiment, as described above, the inertial collision type separator 4 for separating the oil mist contained in the blow-by gas taken into the first passage 1 is provided in the second passage 2 and taken into the first passage 1. A cyclone separator 5 for separating oil mist having a smaller diameter than that of the inertial collision separator 4 among the oil mist contained in the blowby gas is provided in the third passage 3. As a result, both the small diameter and large diameter oil mist can be separated from the blow-by gas taken into the first passage 1 using the two oil separators of the inertial collision type separator 4 and the cyclone type separator 5. Compared to a configuration with only one oil separator, blow-by gas can be guided to intake air with oil mist removed more accurately, and as a result, the amount of engine oil taken away (consumption) into intake air is reduced. can do.

  Further, in the present embodiment, as described above, the opening areas of the suction ports 11a to 11d provided on the upstream side (X2 direction side) of the blow-by gas flowing through the first passage 1 are relatively increased. Thereby, since the opening area becomes larger on the upstream side (back side) where the pressure loss tends to increase because the path becomes longer, it is possible to suppress the upstream pressure loss from increasing. As a result, when a plurality of suction ports 11a to 11d are provided in the first passage 1, the suction ports on the near side (downstream side) and the back of the first passage 1 extending in the arrangement direction (X direction) of the plurality of cylinders 10a. Since it is possible to suppress variation in the amount of blow-by gas taken in (suctioned) at the side (upstream side) inlet, it is possible to suppress variation in the ventilation performance of the blow-by gas depending on the position in the engine 10.

  In the present embodiment, as described above, a part of the second passage 2 is constituted by the timing chain cover 40 of the engine 10, and blow-by gas taken into the first passage 1 is contained in the second passage 2. The inertial collision type separator 4 is configured to separate oil mist having a diameter larger than that of the cyclonic separator 5 by being collided with the rib 41. Thereby, since the timing chain cover 40 can be diverted as a part of the 2nd channel | path 2, unlike the case where the 2nd channel | path 2 is comprised only by an exclusive member, it can suppress that a number of parts increases. . Further, the oil mist having a large diameter can be separated using the rib 41 having a simple configuration.

  In the present embodiment, as described above, the second passage 2 is constituted by the timing chain cover 40 and the partition wall member 80 provided inside the timing chain cover 40. Further, a part of the surface 80a of the partition wall member 80 on the side where the timing chain 30 opposite to the second passage 2 is disposed is formed flat, and the engine falls on the partition wall member 80 from above the engine 10 An oil receiving portion 803 that collects the oil and guides the collected engine oil to a flat portion of the surface 80 a of the partition wall member 80 is provided. Thus, the oil receiving portion 803 can efficiently collect the engine oil falling from the upper part of the engine 10 and rectify the collected engine oil along the flat portion of the surface 80a of the partition wall member 80. Since the oil can be guided to the lower oil reservoir 70, it is possible to prevent bubbles from being mixed into the engine oil in the oil reservoir 70. As a result, the supply oil pressure of the engine oil can be stabilized and the deterioration of the engine oil can be suppressed.

  In the present embodiment, the suction ports 11 a to 11 d are formed in the lower portion of the first passage 1 as described above. Thus, unlike the case where the suction ports 11a to 11d are formed in the upper part of the first passage 1, the engine oil falling from above due to its own weight is prevented from entering the first passage 1 through the suction ports 11a to 11d. Therefore, it is possible to prevent the engine oil from being mixed into the blow-by gas taken into the first passage 1.

  In the present embodiment, as described above, the first passage 1 is constituted by the pipe member 1a formed separately from the engine body 20. Thus, unlike the case where the first passage 1 is formed integrally with the engine body 20, the first passage 1 extending in the arrangement direction of the plurality of cylinders 10a is easily formed below the plurality of cylinders 10a. Can do.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the said embodiment, although the example which applies the blowby gas collection system of this invention to the engine for motor vehicles was shown, this invention is not limited to this. The blow-by gas collection system of the present invention may be applied to engines other than automobile engines. Further, the blow-by gas collection system of the present invention may be applied to engines other than the four cylinders as long as the engine includes a plurality of cylinders as well as the in-line four-cylinder engine. You may apply to engines other than an inline engine, such as an opposing engine.

  Moreover, in the said embodiment, although the example which provides four suction inlets in a 1st channel | path so as to respond | correspond to four cylinders was shown, this invention is not limited to this. In the present invention, one suction port may be provided in the first passage, or a plurality of suction ports other than four may be provided regardless of the number of cylinders. When only one suction port is provided, as in the modification shown in FIG. 6, one slit-like suction port 11e is provided, and the opening area of the suction port 11e is set on the upstream side of the blow-by gas (first passage). In order to increase the distance toward the rear (1 side), the slit-shaped suction is performed so that the opening width in the direction (Y direction) orthogonal to the direction (X direction) in which the first passage 1 extends gradually increases toward the upstream side. The mouth 11e may be formed. Further, in the configuration in which the plurality of suction ports are provided, even when the opening areas of the plurality of suction ports are the same as each other, the opening area is relatively increased toward the upstream side of the blow-by gas flowing through the first passage. The arrangement density of the plurality of suction ports may be relatively increased toward the upstream side of one passage.

  Moreover, in the said embodiment, although an inertial collision type separator and a cyclone type separator were respectively shown as an example of the 1st oil separator of this invention, and a 2nd oil separator, this invention is not limited to this. In the present invention, the first oil separator and the second oil separator may be oil separators other than the inertial collision separator and the cyclone separator, respectively.

  Moreover, although the example which comprises the 1st channel | path of this invention by the pipe member formed separately from the engine main-body part was shown in the said embodiment, this invention is not limited to this. In the present invention, the first passage may be formed integrally with the engine body (crankcase).

  Moreover, in the said embodiment, although the example which integrally forms in a partition member the some rib which comprises the inertial collision type separator (1st oil separator) of a 2nd channel | path was shown, this invention is not limited to this. . In the present invention, the rib of the first oil separator may be formed integrally with the timing chain cover, or the rib may be formed separately from the partition wall member and the timing chain cover.

  Moreover, in the said embodiment, although the metal timing chain cover was shown as an example of the timing chain cover of this invention, this invention is not limited to this. In the present invention, a resin timing chain cover may be used.

  Moreover, in the said embodiment, although the resin-made head covers were shown as an example of the head cover of this invention, this invention is not limited to this. In the present invention, a metal head cover such as iron, aluminum, or magnesium may be used.

  Moreover, although the example which provides resin-made intake devices was shown in the said embodiment, this invention is not limited to this. In the present invention, a metal intake device such as iron or aluminum may be used.

1 1st passage 2 2nd passage (guide passage)
3 Third passage (guide passage)
4 Inertial collision separator (first oil separator)
5 Cyclone separator (second oil separator)
10 Engine (Internal combustion engine)
10a Cylinder 11a, 11b, 11c, 11d, 11e Suction port 20 Engine body (main body)
20c Crankcase 30 Timing chain 40 Timing chain cover 41 Rib 50 Head cover 70 Oil reservoir 80 Bulkhead member 80a Surface 100 Blow-by gas collection system 803 Oil receiving part

Claims (11)

A first passage including a suction port that is provided below the plurality of cylinders of the internal combustion engine so as to extend in an arrangement direction of the plurality of cylinders and into which blow-by gas discharged from the plurality of cylinders is sucked;
A guide passage for guiding the blow-by gas taken into the first passage from the suction port to the intake air introduced into the plurality of cylinders ,
Wherein the inlet of the first passage, the relatively open area as the upstream side of the blow-by gas flowing through the first passage has been configured to be larger, the blow-by gas collection system. A first passage including a suction port that is provided below the plurality of cylinders of the internal combustion engine so as to extend in an arrangement direction of the plurality of cylinders and into which blow-by gas discharged from the plurality of cylinders is sucked;
A guide passage for guiding the blow-by gas taken into the first passage from the suction port to the intake air introduced into the plurality of cylinders,
A plurality of the suction ports of the first passage are provided, and the blow-by gas collection system has a relatively large opening area as the suction port is provided upstream of the blow-by gas flowing through the first passage. . The blow-by gas collection system according to claim 1 or 2 , wherein a plurality of the inlets are provided so as to correspond to at least each of the plurality of cylinders. The guide passage is provided in a timing chain cover of the internal combustion engine and is connected to the first passage, and a third passage is provided in the head cover of the internal combustion engine and is connected to the second passage. The blowby gas collection system according to any one of claims 1 to 3 , comprising: A first oil separator provided in the second passage, for separating oil mist contained in blow-by gas taken into the first passage;
And a second oil separator that is provided in the third passage and separates an oil mist having a smaller diameter than the first oil separator out of the oil mist contained in the blow-by gas taken into the first passage. Item 5. The blowby gas collection system according to Item 4 .   The blow-by gas collection according to claim 5, wherein a plurality of the suction ports are provided, and an opening area is relatively larger as a suction port provided on an upstream side of the blow-by gas flowing through the first passage. system. The second passage is at least partially configured by a timing chain cover of the internal combustion engine,
The first oil separator is constituted by a rib provided in the second passage, and blow-by gas taken into the first passage collides with the rib in the second passage, whereby the second oil separator is provided. The blow-by gas collection system according to claim 5 or 6 configured to separate oil mist having a diameter larger than that of the separator. The second passage is constituted by the timing chain cover and a partition member provided inside the timing chain cover,
The partition member is formed to have at least a part of the surface on the side where the timing chain opposite to the second passage is disposed,
The oil receiving portion that collects oil falling from an upper portion of the internal combustion engine and guides the collected oil to a flat portion of the surface of the partition member is provided at an upper portion of the partition member. The blowby gas collection system according to any one of 4 to 7.   The blow-by gas collection system according to any one of claims 1 to 8, wherein the suction port is formed in a lower portion of the first passage.   The first passage is arranged in a crankcase of the internal combustion engine, below the plurality of cylinders, and at a position above an oil reservoir at a lower portion of the crankcase. The blowby gas collection system of any one of these.   The blow-by gas collection system according to any one of claims 1 to 10, wherein the first passage is configured by a pipe member formed separately from a main body of the internal combustion engine.

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