JP6241266B2 - 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, a blow-by gas collection system that guides blow-by gas (unburned gas) leaking from a gap between a piston and a cylinder to intake air introduced into an engine cylinder is known (see, for example, Patent Document 1).

  In Patent Document 1, a chain cover is provided on one side of an engine (internal combustion engine), and blow-by gas in the engine (crankcase) is supplied to the cylinder through a passage formed inside the chain cover. A configuration (blow-by gas collection system) that leads to an intake air introduction path is disclosed. In the configuration described in Patent Document 1, an opening (suction port) that opens to the crankcase is provided in the lower region of the chain cover passage, and the blow-by gas in the crankcase is utilized by utilizing the negative pressure of the intake air. Is sucked into the passage inside the chain cover through the opening (suction port).

JP 2003-41922 A

  However, in the configuration of the above-mentioned Patent Document 1 (blow-by gas collection system), blow-by gas in the crankcase is chained via an opening (suction port) in a lower region of the chain cover provided on one side of the engine. Since it only has a structure to be sucked into the passage inside the cover, the oil in the crankcase (oil falling from the inner wall of the cylinder to the oil reservoir and the oil reservoir by the rotation of the crankshaft) Oil that has been bounced up) is easily sucked together. For this reason, there exists a problem that blow-by gas will be collected in the state in which oil was contained excessively. In order to cope with this problem, even if a separator for separating the oil mist is provided in the blow-by gas suction passage, there is a risk that the amount of oil in the blow-by gas flowing is too large to catch up with the separator function. In some cases, effective oil separation cannot be performed by a separator.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to suppress the collection of blow-by gas in a state where oil is excessively contained. Provide a blowby gas collection system.

In order to achieve the above object, a blow-by gas collection system according to one aspect of the present invention is provided in an internal combustion engine, and has a suction port for sucking blow-by gas containing oil discharged from a cylinder, and a suction port. A suction passage including a discharge port for discharging oil contained in the blow-by gas into the internal combustion engine, and a guide passage for guiding the blow-by gas sucked into the suction passage from the suction port to the intake air introduced into the cylinder The suction passage has a shape in which oil contained in the blow-by gas is difficult to be sucked into the suction passage, and the suction passage guides the blow-by gas sucked from the suction port to the guide passage. Blowby gas passage, oil passage for guiding oil contained in blowby gas to the discharge port, blowby gas passage and oil Further comprising a partition wall partitioning the road, the partition wall portion penetrates the partition wall portion, that having a communication hole for communicating the blow-by gas passage and the oil passage. The “oil” in the present invention is a broad concept including oil in the form of droplets (oil droplets) having a relatively small particle diameter and oil mist that is finely divided and floats in blow-by gas. is there.

  In the blow-by gas collection system according to one aspect of the present invention, as described above, the suction including the suction port for sucking the blow-by gas and the discharge port for discharging the oil contained in the blow-by gas into the internal combustion engine. The suction port of the suction passage has a shape in which the oil contained in the blow-by gas is difficult to be sucked into the suction passage, so that when the blow-by gas is sucked into the suction passage, the oil contained in the blow-by gas is reduced. Suction into the suction passage together with the blow-by gas can be suppressed. Even if some oil is sucked into the suction passage together with the blow-by gas through the suction port, the oil is discharged into the internal combustion engine through the discharge port provided in the suction passage. Can do. Thereby, it can suppress that blow-by gas is collected in the state where oil was contained excessively.

  In the blow-by gas collection system according to the above aspect, preferably, the suction port has a shape in which the opening area decreases toward the blow-by gas suction direction. If comprised in this way, since the opening area is relatively large in the area | region where the suction of blow-by gas containing oil is started in an inlet, the suction speed (gas flow velocity) of blow-by gas can be reduced. Therefore, it is possible to reduce the amount of oil that is sucked into the blow-by gas (flowed into the suction passage). In addition, by forming the suction port so that the opening area becomes relatively small in the blow-by gas suction direction, the gas flow rate when the blow-by gas with a reduced amount of oil is sucked is gradually increased. As a result, blow-by gas can be sucked in efficiently.

  In the blow-by gas collection system according to the above aspect, preferably, the suction port has a L-shaped longitudinal section and extends in a tubular shape, and the tube wall on the side close to the oil level of the suction port having the L-shape. The part is arranged so as to cover the oil level from above. If comprised in this way, since the suction inlet (opening part leading to the suction passage) does not face the oil level, the oil falling from the cylinder or the crankshaft is swung up by being swung up in the oil reservoir. It is possible to easily suppress the oil from being directly sucked through the suction port. Even when the splashed oil is sucked into the suction port, since the longitudinal section has an L shape and extends in a tubular shape, the oil turns to the L shape of the suction port. It can collide with an inner wall part and can be separated from blow-by gas. As a result, the amount of oil sucked into the blow-by gas (flowed into the suction passage) can be effectively reduced.

  In the blow-by gas collection system according to the above aspect, the opening area of the outlet portion of the discharge port is preferably smaller than the opening area of the portion other than the outlet portion of the discharge port. With this configuration, when blow-by gas containing oil is sucked in from the suction port, the oil (oil droplets) having a certain level of liquid level at the discharge port with the opening area of the outlet portion narrowed. It is possible to temporarily store the oil (oil droplets) that has been temporarily stored, from the outlet portion where the opening area of the bottom of the discharge port is narrowed using the weight of the oil. Can be discharged. Also, as the oil (oil droplets) is discharged, the inside of the discharge port is filled with blow-by gas, so that the oil (oil droplets) temporarily taken into the suction passage is also reliably discharged from the discharge port. can do.

In the blow-by gas collection system according to the aforementioned aspect preferably, communication hole is provided at a position that does not overlap with the discharge port. If constituted in this way, the blow-by gas sucked from the suction port can be easily guided to the blow-by gas passage through the communication hole, and without being affected by the flow of the blow-by gas passing through the communication hole, The oil can be moved from the oil passage to a discharge port provided at a position not overlapping the communication hole. Thereby, the oil in blow-by gas can be easily guide | induced to a discharge port through the exclusive oil path (different use) divided from the blow-by gas path.

  In the present application, the following configuration is also conceivable in the blowby gas collection system according to the above aspect.

(Additional item 1)
That is, in the blow-by gas collection system according to the one aspect described above, the blow-by gas collection system further includes a side passage provided in the side portion of the internal combustion engine so as to extend in the vertical direction, and returns the oil into the internal combustion engine. The crankshaft is disposed in a region in the internal combustion engine opposite to the side where the side passage is provided. If comprised in this way, the suction passage for mainly sucking in blow-by gas can be arranged as far as possible from the side passage for returning oil into the internal combustion engine (oil reservoir). Therefore, it is possible to effectively suppress the oil mist immediately after falling into the oil reservoir through the side passage from being easily sucked into the suction passage from the suction port. Also by this, it can suppress more that the oil contained in blow-by gas is sucked into a suction passage with blow-by gas.

(Appendix 2)
In the blow-by gas collection system according to the above aspect, the internal combustion engine is disposed to be inclined at a predetermined mounting angle with respect to the vertical direction, and the suction port of the suction passage is inclined with respect to the vertical direction of the internal combustion engine. It is arranged in a region in the internal combustion engine on the opposite side to. With this configuration, in an internal combustion engine that is disposed at a predetermined mounting angle with respect to the vertical direction, a position where oil does not accumulate in the oil reservoir in a large amount (relative oil storage depth is relative). The suction port of the suction passage can be arranged above the (shallow position). Therefore, it is possible to effectively suppress a large amount of oil stored below the suction port from being sucked into the suction passage. Also by this, it can suppress more that the oil contained in blow-by gas is sucked into a suction passage with blow-by gas.

(Additional Item 3)
Further, in the blow-by gas collection system according to the one aspect, the suction passage is disposed at a position separated from the inner wall surface of the internal combustion engine. With such a configuration, in a situation where oil falling from a cylinder in the internal combustion engine or oil splashed and sprung up in the oil reservoir by rotation of the crankshaft drips down the inner wall surface of the internal combustion engine. In addition, since the suction passage is disposed at a position separated from the inner wall surface of the internal combustion engine, it is possible to easily suppress the oil dripping down the inner wall surface from being sucked into the suction passage.

(Appendix 4)
Further, in the blow-by gas collection system according to the above aspect, the suction passage is provided so as to extend along a direction in which the crankshaft extends at a predetermined interval from the crankshaft of the internal combustion engine. When the line indicating the rotation direction of the crankshaft passes through the center of the suction passage, the suction port is located at a portion of the suction passage located on the tip side of the line indicating the rotation direction of the crankshaft. Is provided. According to this configuration, even when the oil is splashed upward along the rotation direction of the crankshaft by being stirred in the internal combustion engine by the rotation of the crankshaft, the suction port is centered on the crankshaft. As a result, it is possible to arrange the oil on the other side in the horizontal direction where the oil does not jump up significantly, rather than on the other side in the horizontal direction where oil jumps up significantly. Can be suppressed.

(Appendix 5)
In the blow-by gas collection system according to the above aspect, the discharge port extends to a position lower than the oil level of the oil accumulated in the internal combustion engine. With this configuration, since the discharge port communicates with the oil stored in the oil reservoir, when blow-by gas containing oil is sucked from the intake port, the oil accumulated in the discharge port is stored in the oil reservoir. The oil stored in the part can be easily sucked out. That is, the oil accumulated in the discharge port can be quickly and continuously discharged to the oil reservoir.

  ADVANTAGE OF THE INVENTION According to this invention, as mentioned above, the blowby gas collection system which can suppress that blowby gas is collected in the state in which oil was contained excessively can be provided.

It is the schematic which showed the structure of the blowby gas collection system by 1st Embodiment of this invention. 1 is a perspective view partially showing an internal structure of an engine to which a blow-by gas collection system according to a first embodiment of the present invention is applied. It is the top view which showed the arrangement | positioning state of the suction passage which suck | inhales the blowby gas in the engine to which the blowby gas collection system by 1st Embodiment of this invention is applied. 1 is a side view of an engine when viewed from an axial direction of a crankshaft in an engine to which a blow-by gas collection system according to a first embodiment of the present invention is applied. It is sectional drawing which showed the structure of the suction passage which suck | inhales the blowby gas in the blowby gas collection system by the 1st modification of 1st Embodiment of this invention. It is sectional drawing which showed the structure of the suction passage which suck | inhales the blow-by gas in the blow-by gas collection system by the 2nd modification of 1st Embodiment of this invention. It is sectional drawing which showed the structure of the suction passage which suck | inhales the blowby gas in the blowby gas collection system by 2nd Embodiment of this invention. It is sectional drawing which showed the structure of the suction passage which suck | inhales the blowby gas in the blowby gas collection system by 3rd Embodiment of this invention. It is sectional drawing which showed the structure of the suction passage which suck | inhales the blowby gas in the blowby gas collection system by the modification of 3rd Embodiment of this invention. It is sectional drawing which showed the structure of the suction passage which suck | inhales the blowby gas in the blowby gas collection system by 4th Embodiment of this invention. It is sectional drawing which showed the structure of the suction passage which suck | inhales the blowby gas in the blowby gas collection system by the modification of 4th Embodiment of this invention.

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

  With reference to FIGS. 1-4, the structure of the blowby gas collection system 100 by 1st Embodiment of this invention is demonstrated.

  The blow-by gas collection system 100 according to the first embodiment of the present invention is applied to, for example, an automobile engine 10 as shown in FIG. That is, the blow-by gas collection system 100 introduces blow-by gas (PCV (Positive Crankcase Ventilation) gas) discharged (leaked) from a plurality of (four-cylinder) cylinders 10a of the engine 10 into the four cylinders 10a. It has a role to lead again to the intake air. The engine 10 is an example of the “internal combustion engine” in the present invention.

  The blowby gas collection system 100 will be described structurally. The engine 10 includes an engine body 11 including a cylinder head 11a, a cylinder block 11b, and a crankcase 11c. Further, a metal (for example, aluminum) timing chain cover 20 (hereinafter referred to as TCC 20) that covers the timing chain 21 is attached to one side (X1 side) of the engine body 11. A resin head cover 30 is attached to the upper side of the cylinder head 11a. The cylinder head 11a is connected to a resin intake device 40 that introduces intake air into each of the four cylinders 10a arranged in a line along the X direction.

  The cylinder head 11a is disposed on the upper side (Z1 side) of the cylinder block 11b, and the crankcase 11c is disposed on the lower side (Z2 side) of the cylinder block 11b. Here, much of the blow-by gas (unburned gas) is discharged from the lower part of each cylinder 10a. An oil reservoir 11d for accumulating engine oil (hereinafter simply referred to as oil) is provided in the lower region of the crankcase 11c. The oil is pumped up from the oil reservoir 11d to the upper part of the engine 10 by an oil pump (not shown) and supplied to movable parts (sliding parts) around the crankshaft 90 (see FIG. 2) and the piston 91 (see FIG. 2). After that, it is dropped by its own weight and returned to the oil reservoir 11d.

  Here, in the first embodiment, the engine 10 is provided in the suction passage 1 provided in the crankcase 11c, the guide passage 2 provided in the TCC 20 and extending in the vertical direction (Z direction), and the head cover 30. And an upper passage 3. The blow-by gas collection system 100 is configured to introduce blow-by gas generated inside the engine 10 into intake air introduced into the four cylinders 10a through the suction passage 1, the guide passage 2, and the upper passage 3 in this order. Has been. Further, as shown in FIGS. 1 and 3, the engine 10 further includes a side passage 4 for returning the oil to the oil reservoir 11d. The side passage 4 is provided on the side of the Y2 side different from the side of the X1 side to which the TCC 20 inside the engine body 11 is attached, and an oil discharge part and a crank in a cyclone separator 80 (see FIG. 1) described later. The case 11c is connected in the vertical direction (Z direction). Hereinafter, the flow path of blow-by gas will be described in order.

  Specifically, as shown in FIGS. 1 to 3, the suction passage 1 extends along the arrangement direction (X direction) of the four cylinders 10 a obliquely below the cylinder 10 a (Y1 side and Z2 side). Yes. That is, the suction passage 1 is formed so as to extend from one side (X1 side) of the engine body 11 where the TCC 20 is provided toward the other side (X2 side) in the arrangement direction of the cylinders 10a. As shown in FIGS. 1 and 4, the suction passage 1 is disposed in the crankcase 11c below the four cylinders 10a and above the oil reservoir 11d (Z1 side). Yes.

  The suction passage 1 is configured by a resin tubular member 50 formed separately from the engine body 11. As shown in FIG. 2, the tubular member 50 includes a crankshaft 90 that rotates in the direction of arrow R (clockwise as viewed from the X1 side), a connecting rod (not shown) connected to the piston 91, and the like in the crankcase 11c. And is disposed at a position avoiding the crankshaft 90 and the connecting rod. In FIG. 2, the crankshaft 90 is illustrated in a substantially rod shape. However, in actuality, the crankshaft 90 has a crankpin whose rotational axis is eccentric immediately below each cylinder 10 a and a balance that sandwiches the crankpin. A weight is connected to the crank journal.

  As shown in FIGS. 1 and 2, the tubular member 50 constituting the suction passage 1 has suction ports 51, 52 for sucking blow-by gas discharged from the four cylinders 10 a into the suction passage 1. 53 and 54 are provided. Further, the tubular member 50 is further provided with a discharge port 55 for discharging oil contained in the blow-by gas sucked from the suction ports 51 to 54 to the oil reservoir 11d in the engine 10. Accordingly, the blow-by gas is sucked into the suction passage 1 from each of the suction ports 51 to 54 of the tubular member 50. Further, the blow-by gas sucked into the suction passage 1 is led to intake air introduced into the four cylinders 10a through the guide passage 2 and the upper passage 3 (see FIG. 1). The blow-by gas is sucked into the suction passage 1 through the upper passage 3 and the guide passage 2 by the negative pressure generated in the cylinder 10a as the piston 91 (see FIG. 2) reciprocates.

  Further, the suction ports 51 to 54 are provided at positions corresponding to the four cylinders 10a as shown in FIGS. Further, the suction ports 51 to 54 have a relatively large opening area toward the upstream side (X2 side) of the blow-by gas flowing through the suction passage 1. That is, the opening area (caliber) of the suction port 51 arranged on the other side (X2 side) of the engine body 11 is the largest, and the opening area (the opening area of the suction port 54 arranged on one side (X1 side) of the engine body 11 ( (Caliber) is the smallest. The suction ports 51 to 54 are both formed in the lower part of the suction passage 1 (lower side of the tubular member 50) and open downward (in the Z2 direction). In addition, an end 50a on the back side (X2 side) of the suction passage 1 is closed, and an end 50b on the near side (X1 side) of the suction passage 1 is a guide passage 2 (see FIG. 1).

  Here, in the first embodiment, each of the suction ports 51 to 54 has a shape in which the oil contained in the blow-by gas is difficult to be sucked into the suction passage 1. For example, the suction port 51 on the most X2 side will be described as an example. As shown in FIG. 1, the suction port 51 has an opening area (blow-by gas passes) in the blow-by gas suction direction (arrow Z1 direction). The cross-sectional area has a vertical cross-sectional shape that gradually decreases. Thereby, in the suction port 51 that opens downwardly in a trumpet shape (conical shape having a hollow), in the region where the suction of blow-by gas containing oil is started, the opening area is relatively large. Is sucked in while the suction speed (gas flow rate) is reduced. Therefore, the amount of oil sucked into the blow-by gas (flowed into the suction passage 1) is reduced. And the suction port 51 gradually increases the gas flow rate when the blow-by gas with the reduced amount of oil is sucked by making the opening area relatively small in the blow-by gas suction direction (arrow Z1 direction). I am letting. The suction ports 52 to 54 also have a longitudinal cross-sectional shape such that the opening area (cross-sectional area through which blow-by gas passes) gradually decreases in the blow-by gas suction direction (arrow Z1 direction). Similar to the port 51, the oil contained in the blow-by gas is difficult to be sucked into the suction passage 1.

  In the first embodiment, a partition wall portion 56 extending in the horizontal direction is provided inside the tubular member 50 constituting the suction passage 1. Further, the inside of the suction passage 1 (tubular member 50) is divided into an upper portion (Z1) side and a lower portion (Z2 side) by the partition wall portion 56. As a result, the suction passage 1 is divided into a blow-by gas passage 57 for guiding the blow-by gas sucked from the suction port 51 to the guide passage 2 and the blow-by gas passage 57, and the oil contained in the blow-by gas is discharged from the discharge port. An oil passage 58 for leading to 55 is provided. The oil passage 58 is closed by the sealing portion 50c at the end portion 50b on the X1 side. Therefore, even when oil (oil mist) is sucked into the suction passage 1 together with the blow-by gas, the blow-by gas is suppressed from being guided to the guide passage 2 in a state where the oil is excessively contained.

  As shown in FIG. 1, the discharge port 55 is provided between the most inlet port 54 on the X1 side and the end 50 b of the tubular member 50. Further, the discharge port 55 is formed in the lower part of the suction passage 1 (the side where the oil passage 58 in the tubular member 50 is provided), and the outlet portion 55a is opened downward (Z2 side).

  Here, in 1st Embodiment, the opening area (cross-sectional area through which oil passes) of the exit part 55a of the discharge port 55 is smaller than the opening area of the root part 55b connected to the tubular member 50 of the discharge port 55. As a result, when blow-by gas containing oil is sucked from the suction ports 51 to 54, oil (oil mist) that mainly circulates through the oil passage 58 enters the discharge port 55 in which the opening area of the outlet portion 55a is narrowed. It has a certain liquid level (Z1 direction) and temporarily accumulates. The oil (oil droplets) temporarily accumulated is quickly discharged from the outlet portion 55a having a narrow opening area at the bottom 55c of the discharge port 55 to the lower oil reservoir 11d using its own weight. . Further, along with the discharge of oil (oil droplets), the blow-by gas flowing through not only the blow-by gas passage 57 but also the oil passage 58 is replaced inside the discharge port 55, and then the oil ( Oil droplets) accumulate. The discharge port 55 is configured to repeat such a periodic oil discharge operation. The root portion 55b is an example of the “portion other than the outlet portion of the discharge port” in the present invention.

  In the first embodiment, the tubular member 50 constituting the suction passage 1 is formed with a plurality of communication holes 59 penetrating the partition wall portion 56 in the vertical direction (Z direction). Each blow-by gas passage 57 and the oil passage 58 are communicated with each other at a place where the communication hole 59 is formed. Further, each communication hole 59 is provided at a position that does not overlap the discharge port 55 in the Z direction. Thereby, the blow-by gas sucked from each of the suction ports 51 to 54 can be easily blown through the nearest communication hole 59 located upstream and downstream of the corresponding suction port (suction ports 51 to 54). Guided to the passage 57. Further, the oil is moved to the discharge port 55 provided at a position not overlapping with the communication hole 59 via the oil passage 58 without being affected by the flow of blow-by gas passing through the communication hole 59. It is configured. At this time, the oil is not led to the blow-by gas passage 57 as much as possible by colliding with the lower surface of the partition wall 56. Thus, the inside of the tubular member 50 has the plurality of communication holes 59 and the partition wall portion 56 is formed. That is, the inside of the tubular member 50 has a labyrinth flow channel structure, and the tubular member 50 itself also serves as a separator portion that separates oil from blow-by gas. Since the oil passage 58 is closed by the sealing portion 50c in the vicinity of the end portion 50b, the oil (oil mist) flowing through the oil passage 58 is not guided to the guide passage 2.

  Further, a part of the guide passage 2 is constituted by the TCC 20. Specifically, as shown in FIGS. 2 to 4, the guide passage 2 is constituted by a TCC 20 and a metal (for example, iron) partition member 60 provided inside the TCC 20. That is, the guide passage 2 is constituted by a space (gap) between the TCC 20 and the plate-like partition wall member 60 that faces the TCC 20 in the X direction. 2, the guide passage 2 is connected to the suction passage 1 (end portion 50b of the tubular member 50) via a circular opening 61 formed in the partition wall member 60, and is also vertically oriented. It is configured to be connected to the upper passage 3 (see FIG. 1) provided in the head cover 30 via a connection passage 62 extending to the head cover 30.

  Further, as shown in FIGS. 2 and 3, an inertial collision type separator unit 70 (preliminary) for separating (removing) oil (oil mist) contained in blow-by gas taken into the suction passage 1 is provided in the guide passage 2. An oil separator) is provided. The separator unit 70 has a function of separating oil mist having a larger diameter than a cyclone separator unit 80 (main oil separator: see FIG. 12) described later provided in the upper passage 3. In addition, the separator unit 70 is configured by a plurality of ribs 63 provided in the guide passage 2. The ribs 63 are formed integrally with the partition wall member 60 and also serve to reinforce the plate-shaped partition wall member 60. In the separator portion 70, when blow-by gas flows through the guide passage 2 in the direction of the arrow Z <b> 1 toward the upper passage 3, the oil mist is separated by the blow-by gas colliding with the plurality of ribs 63 in the guide passage 2. The As shown in FIG. 1, an oil receiving portion 64 that collects oil falling from the upper portion of the engine 10 is provided on the upper portion of the partition wall member 60. The oil receiving part 64 has an opening part 64 a and is configured to guide a part of the collected oil to a flat inner wall surface extending in the Z direction of the partition wall member 60.

  The upper passage 3 is connected to the guide passage 2 via a connection passage 62. As shown in FIG. 1, the upper passage 3 is provided with a cyclone separator 80 for separating (removing) oil (oil mist) contained in the blow-by gas taken into the suction passage 1. The separator 80 is for separating the oil mist having a smaller diameter from the blow-by gas in a state where the oil mist having a larger diameter is separated by the separator 70 (see FIG. 2) of the guide passage 2 by using centrifugal force. Is provided. Therefore, the blow-by gas from which the oil mist is separated (removed) by the separator unit 70 and the separator unit 80 is introduced into the intake air from a predetermined position of the intake device 40. On the other hand, the oil mist separated by the separator unit 80 becomes liquid and is returned to the oil reservoir 11d through the side passage 4. Therefore, the oil separated in the upper passage 3 is returned to the oil reservoir 11d from each of the side passage 4 and the inner wall surface of the partition wall member 60 through the opening 64a.

  Further, as shown in FIG. 2, the engine 10 is disposed to be inclined to one side (Y2 side) at a predetermined mounting angle with respect to the vertical direction (Z direction). That is, the engine 10 is arranged in a state where it is rotated from the vertical direction by a predetermined mounting angle in the direction of the arrow A2.

  Here, in the first embodiment, as shown in FIG. 3 and FIG. 4, the side opposite to the Y2 side (Y1 side) where the side passage 4 is provided with respect to the crankshaft 90 (shown by a broken line) of the engine 10. The suction passage 1 (tubular member 50) is disposed in the region within the engine body 11. Therefore, the suction passage 1 for mainly sucking blow-by gas is arranged as far as possible in the direction of the arrow Y1 with respect to the side passage 4 for returning oil into the engine 10 (oil reservoir 11d). Further, the suction ports 51 to 54 (see FIG. 2) of the suction passage 1 are arranged in a region in the engine 10 on the opposite side (arrow A1 direction) to the inclination direction (arrow A2 direction) with respect to the vertical direction of the engine 10. Yes. Therefore, as shown in FIG. 4, in the engine 10 that is inclined in the direction of the arrow A2, a position where oil does not accumulate in a large amount in the oil reservoir 11d (the oil storage depth in the oil reservoir 11d). The suction ports 51 to 54 of the suction passage 1 are arranged above (Z1 side) above (relatively shallow position on the Y1 side).

  In the first embodiment, the suction passage 1 (tubular member 50) is disposed at a position spaced in the direction of the arrow Y2 from the inner wall surface 10b on the Y1 side of the engine 10 (engine body 11). Therefore, the oil falling from the cylinder 10a in the engine 10 or the oil that has been swung up in the crankcase 11c by the rotation of the crankshaft 90 in the direction of the arrow R drips down the inner wall surface 10b of the engine 10. Even in such a situation, the oil dripping down the inner wall surface 10b is configured to be difficult to be sucked into the suction passage 1 from the suction ports 51 to 54.

  As shown in FIG. 2, the suction passage 1 is provided so as to extend along the X direction in which the crankshaft 90 extends with a predetermined distance from the crankshaft 90 of the engine 10. As shown in FIG. 4, when viewed from the axial direction (X1 side) of the crankshaft 90, an arrow line 195 (dashed line) indicating the rotation direction of the crankshaft 90 passes through the center of the suction passage 1. In the suction passage 1, suction ports 51 to 54 of the suction passage 1 are provided in a portion located on the tip side (Z2 side) of the arrow line 195 indicating the rotation direction of the crankshaft 90. That is, even when the oil is stirred in the crankcase 11c by the rotation of the crankshaft 90 in the direction of the arrow R and splashed up in the direction of the arrow R (the direction of the arrow Z1), the oil in the crankcase 11c The suction ports 51 to 54 are arranged on the Y1 side in the horizontal direction where the oil is not significantly raised, not on the Y2 side in the horizontal direction where the oil is significantly raised.

  As shown in FIGS. 2 and 3, in the TCC 20, a crankshaft timing sprocket (not shown) attached to the crankshaft 90 and a camshaft (not shown) incorporated in the cylinder head 11a. 1) The driving camshaft timing sprocket 31 is connected by the timing chain 21. A crank pulley (not shown) is attached to the front end (X1 side) of the crankshaft 90. Auxiliaries such as a water pump for circulating cooling water and a compressor for air conditioning in the vehicle are driven by a belt hung on a crank pulley. Further, the rear end (X2 side) of the crankshaft 90 is connected to a power transmission unit (not shown) including a transmission or the like. The blow-by gas collection system 100 in the first embodiment is configured as described above.

  In the first embodiment, the following effects can be obtained.

  That is, in the first embodiment, as described above, the suction passage including the suction ports 51 to 54 for sucking blow-by gas and the discharge port 55 for discharging oil contained in the blow-by gas into the engine 10. 1 is provided. When the blow-by gas is sucked into the suction passage 1 by configuring the suction ports 51 to 54 of the suction passage 1 so that the oil contained in the blow-by gas is difficult to be sucked into the suction passage 1, The oil contained in the gas can be suppressed from being sucked into the suction passage 1 together with the blow-by gas. Further, even if some oil is sucked into the suction passage 1 together with the blow-by gas through the suction ports 51 to 54, the oil is supplied to the engine through the discharge port 55 provided in the suction passage 1. 10 (crankcase 11c) can be discharged. Thereby, it can suppress that blow-by gas is collected in the state where oil was contained excessively.

  In the first embodiment, the blow-by gas passage 57 for guiding the blow-by gas sucked from the suction ports 51 to 54 to the guide passage 2 and the blow-by gas passage 57 are partitioned, and the oil contained in the blow-by gas is discharged. The suction passage 1 is constituted by the oil passage 58 for leading to the outlet 55. Thereby, even when blow-by gas containing oil is sucked into the suction passage 1, the blow-by gas is guided to the guide passage 2 through the blow-by gas passage 57, and the oil in the blow-by gas is blown into the blow-by gas passage 57. And can be led to the discharge port 55 through a dedicated oil passage 58 partitioned. Therefore, even when the oil is sucked into the suction passage 1 together with the blow-by gas, it is possible to easily suppress the blow-by gas being guided to the guide passage 2 in a state where the oil is excessively contained.

  Moreover, in 1st Embodiment, the inlets 51-54 are comprised so that it may have a shape where an opening area becomes small toward the suction direction of blow-by gas. Thereby, in the area | region where the suction of blow-by gas containing oil is started in the suction inlets 51-54, since the opening area is relatively large, the suction speed (gas flow velocity) of blow-by gas can be reduced. Accordingly, it is possible to reduce the amount of oil sucked into the blowby gas (flowed into the suction passage 1). Further, by forming the suction ports 51 to 54 so that the opening area becomes relatively small in the blow-by gas suction direction, the gas flow rate when the blow-by gas with a reduced amount of oil is sucked is gradually increased. Since it can be increased, the blow-by gas in the crankcase 11c can be sucked in efficiently.

  Moreover, in 1st Embodiment, the opening area of the exit part 55a of the discharge port 55 is comprised smaller than the opening area of parts other than the exit part 55a of the discharge port 55. FIG. As a result, when blow-by gas containing oil is sucked from the suction ports 51 to 54, the discharge port 55 in which the opening area of the outlet portion 55a is narrowed has a certain level of liquid level (oil droplets). Can be temporarily stored, and the oil (oil droplets) in the temporarily stored state can be removed from the outlet portion 55a in which the opening area of the bottom 55c of the discharge port 55 is narrowed by using the weight of the oil. Can be quickly discharged downward. Further, since the blow-by gas is replaced and filled in the discharge port 55 together with the discharge of oil (oil droplets), the oil (oil droplet) temporarily taken into the suction passage 1 can be reliably discharged by this. 55 can be discharged.

  In the first embodiment, the suction passage 1 further includes a communication hole 59 that allows the blow-by gas passage 57 and the oil passage 58 to communicate with each other, and the communication hole 59 is provided at a position that does not overlap the discharge port 55 in the Z direction. Thereby, the blow-by gas sucked from the suction ports 51 to 54 can be easily guided to the blow-by gas passage 57 through the communication hole 59 and is affected by the flow of the blow-by gas passing through the communication hole 59. Therefore, the oil can be moved from the oil passage 58 to the discharge port 55 provided at a position not overlapping the discharge port 55. Thereby, the oil in the blow-by gas can be easily guided to the discharge port 55 via the dedicated (different use) oil passage 58 partitioned from the blow-by gas passage 57.

  Further, in the first embodiment, the side portion of the engine 10 is provided so as to extend in the vertical direction, and further includes a side passage 4 for returning oil into the engine 10, and is provided on the side of the engine 10 with respect to the crankshaft 90. The suction passage 1 is arranged in a region in the engine 10 opposite to the side where the partial passage 4 is provided. Thereby, the suction passage 1 for mainly sucking blow-by gas can be arranged as far as possible from the side passage 4 for returning the oil into the engine 10 (oil reservoir 11d). Therefore, it is possible to effectively suppress the oil mist immediately after dropping into the oil reservoir 11d through the side passage 4 from being easily sucked into the suction passage 1 from the suction ports 51 to 54. This also makes it possible to further suppress the oil contained in the blow-by gas from being sucked into the suction passage 1 together with the blow-by gas.

  In the first embodiment, the engine 10 is disposed to be inclined to one side (Y2 side (arrow A2 direction)) at a predetermined mounting angle with respect to the vertical direction (Z direction). The suction ports 51 to 54 are arranged in a region in the engine 10 on the opposite side (Y1 side) from the inclination direction with respect to the vertical direction of the engine 10. As a result, in the engine 10 arranged to be inclined at a predetermined mounting angle with respect to the vertical direction, a position where the oil does not accumulate in a large amount in the oil reservoir 11d (the oil storage depth is relatively shallow). The suction ports 51 to 54 of the suction passage 1 can be arranged above (position) (Z1 side). Therefore, it is possible to effectively suppress a large amount of oil stored under the suction port 51 (Z2 side) from being sucked into the suction passage 1 from the suction ports 51 to 54. This also makes it possible to further suppress the oil contained in the blow-by gas from being sucked into the suction passage 1 together with the blow-by gas.

  In the first embodiment, the suction passage 1 is disposed at a position spaced from the inner wall surface 10 b of the engine 10. As a result, the oil falling from the cylinder 10a in the engine 10 or the oil splashed and sprung up in the oil reservoir 11d by the rotation of the crankshaft 90 drips down the inner wall surface 10b of the engine 10. Since the suction passage 1 is disposed at a position separated from the inner wall surface 10b of the engine 10, the oil dripping down the inner wall surface 10b is easily suppressed from being sucked into the suction passage 1 from the suction ports 51 to 54. be able to.

  In the first embodiment, the suction passage 1 is provided so as to extend along the X direction in which the crankshaft 90 extends at a predetermined interval from the crankshaft 90 of the engine 10. When viewed from (X direction), the arrow line 195 indicating the rotation direction of the crankshaft 90 passes through the center of the suction passage 1, and the rotation direction of the crankshaft 90 (arrow R direction) in the suction passage 1. Suction ports 51 to 54 are provided in the portion located on the tip side of the arrow line 195 indicating the above. As a result, even when the crankshaft 90 is swung in the crankcase 11c by the rotation in the direction of arrow R and the oil is splashed upward along the direction of arrow R (the direction of arrow Z1), the suction port 51 ˜54 can be arranged not on the Y2 side in the horizontal direction where the oil jumps up significantly but on the Y1 side in the horizontal direction where the oil jumps up not significantly, so that the oil splashed up to the suction ports 51-54 Inhalation can be easily suppressed.

(First modification of the first embodiment)
Next, a first modification of the first embodiment will be described with reference to FIGS. 1 and 5. The first modification of the first embodiment differs from the first embodiment in which the outlet 55 in the suction passage 1 (see FIG. 1) is provided with an outlet 55a that opens downward (the oil reservoir 11d). An example in which a discharge port 155 having an outlet portion 155a extending in the horizontal direction is provided in the suction passage 101a (tubular member 150) will be described. In the figure, components similar to those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.

  In the blow-by gas collection system 100a according to the first modification of the first embodiment of the present invention, as shown in FIG. 5, in the suction passage 101a, the discharge port 155 having the outlet portion 155a is the end of the tubular member 150 on the X1 side. It is provided in the part 50b. The outlet portion 155a extends in the horizontal direction (X1 direction) at the bottom 155c of the discharge port 155 and opens into the crankcase 11c.

  In this case, as in the case where the outlet portion 55a (see FIG. 1) opening downward is provided, when the blow-by gas containing oil is sucked from the suction ports 51 to 54, a certain amount of liquid is placed in the discharge port 155. The oil temporarily accumulates with a surface height (Z1 direction), and the oil accumulates from the outlet portion 155a extending horizontally in the bottom 155c of the discharge port 155 due to the weight of the accumulated oil itself. Quickly discharged. The blow-by gas is replaced in the discharge port 155 once the oil has been discharged, and then the oil (oil droplets) is accumulated again until a certain level of liquid level is obtained. Such a periodic oil discharge operation is repeated also at the discharge port 155 having the outlet portion 155a. In addition, the other structure of the blowby gas collection system 100a by the 1st modification of 1st Embodiment is the same as that of the said 1st Embodiment.

  In the first modification of the first embodiment, the following effects can be obtained.

  In the first modification of the first embodiment, as described above, the suction passage 101a is configured by providing the discharge port 155 having the outlet portion 155a extending in the horizontal direction at the bottom 155c. Thus, when blow-by gas containing oil (oil mist) is sucked from the suction ports 51 to 54, the discharge port 155 having a narrowed opening area of the outlet portion 155a has a certain level of liquid level. Can be temporarily accumulated, and the oil in the temporarily accumulated state is quickly discharged from the outlet portion 155a in which the opening area of the bottom portion 155c of the discharge port 155 is narrowed using the weight of the oil. can do. Further, since the blow-by gas is replaced and filled in the discharge port 155 as the oil is discharged, the oil temporarily taken into the suction passage 101a can be reliably discharged from the discharge port 155. The remaining effects of the first modification of the first embodiment are similar to those of the aforementioned first embodiment.

(Second modification of the first embodiment)
Next, a second modification of the first embodiment will be described with reference to FIGS. 1 and 6. In the second modification of the first embodiment, the first embodiment in which one discharge port 55 is provided between the suction port 54 and the end portion 50b of the tubular member 50 in the suction passage 1 (see FIG. 1), Differently, an example in which each of the discharge ports 165a to 165d for discharging oil is formed immediately after (on the downstream side) of each of the suction ports 51 to 54 to configure the suction passage 101b (tubular member 160) will be described. In the figure, components similar to those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.

  In the blow-by gas collection system 100b according to the second modification of the first embodiment of the present invention, as shown in FIG. 6, in the suction passage 101b, a discharge port 165a is provided immediately (downstream side) after the suction port 51, A discharge port 165b is provided immediately after the suction port 52 (on the downstream side). A discharge port 165c is provided immediately after (downstream side) the suction port 53, and a discharge port 165d is provided immediately after (downstream side) the suction port 54. Each of the outlets 165a to 165d is formed with an outlet portion 55a that opens downward at the bottom 55c.

  In addition, the communication hole 59 includes a portion of the partition wall portion 56 between the suction port 51 and the discharge port 165a, a portion of the partition wall portion 56 between the suction port 52 and the discharge port 165b, and the suction port 53 and the discharge port 165c. The partition wall 56 is provided between the partition wall 56 and the partition wall 56 between the suction port 54 and the discharge port 165d. Therefore, when blow-by gas containing oil is sucked from the suction ports 51 to 54, the blow-by gas is blown through the nearest communication hole 59 located on the upstream side and the downstream side of each of the suction ports 51 to 54. Guided to the passage 57. Further, the oil (oil mist) collides with the lower surface of the partition wall portion 56 and is not led to the blow-by gas passage 57 as much as possible, and the nearest (downstream side) of each of the suction ports 51 to 54 via the oil passage 58. ) Is discharged to the oil reservoir 11d. In addition, the other structure of the blowby gas collection system 100b by the 2nd modification of 1st Embodiment is the same as that of the said 1st Embodiment.

  In the second modification of the first embodiment, the following effects can be obtained.

  In the second modification of the first embodiment, as described above, immediately after the suction port 51 (downstream side), immediately after the suction port 52 (downstream side), immediately after the suction port 53 (downstream side), and Immediately after (on the downstream side), the suction passage 101b is configured to provide the discharge ports 165a to 165d, respectively. Thereby, the blow-by gas oil sucked from the suction port 51 can be discharged from the discharge port 165a immediately after the suction port 51, and the blow-by gas oil sucked from the suction port 52 can be discharged immediately after the suction port 52. It can be discharged from the outlet 165b. Further, the blowby gas oil sucked from the suction port 53 can be discharged from the discharge port 165 c immediately after the suction port 53, and the blowby gas oil sucked from the suction port 54 is discharged immediately after the suction port 54. It can be discharged from the outlet 165d. Therefore, the oil sucked from each of the suction ports 51 to 54 can be quickly discharged to the oil reservoir 11d via the discharge ports 165a to 165d, so that the oil is sucked into the suction passage 101b together with the blow-by gas. Even in this case, it is possible to further suppress the blow-by gas being guided to the guide passage 2 in a state where the oil is excessively contained. The remaining effects of the second modification of the first embodiment are similar to those of the aforementioned first embodiment.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. 1 and 7. In the second embodiment, unlike the first embodiment in which the suction passage 1 (see FIG. 1) is constituted by the blow-by gas passage 57 and the oil passage 58, the suction ports 51 to 54 and the discharge port 55 are made to be the tubular member 250. An example in which the suction passage 201 (tubular member 250) is configured by connecting the bottom surface 256a of one common passage portion 256 extending in the horizontal direction will be described. In the figure, components similar to those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.

  In the blow-by gas collection system 200 according to the second embodiment of the present invention, as shown in FIG. 7, in the suction passage 201, the suction ports 51 to 54 and the discharge port 55 are connected to a common passage portion 256 to form a tubular member 250. Is configured. Accordingly, the blow-by gas containing oil is collected from the suction ports 51 to 54 and then circulated through the passage portion 256 in the direction of the arrow X1. The blow-by gas is circulated in the direction of the arrow X1 through the region near the ceiling surface 256b of the passage portion 256 in a state where the flow velocity is relatively increased in the passage portion 256. In contrast, heavy oil (oil mist) is circulated in the direction of the arrow X <b> 1 in the region near the bottom surface 256 a where the flow velocity is relatively low in the passage portion 256. Therefore, the oil mist is circulated through the region near the bottom surface 256a, is led to the discharge port 55 in front of the end 50b, and is discharged to the oil reservoir 11d. In addition, the other structure of the blowby gas collection system 200 by 2nd Embodiment is the same as that of the said 1st Embodiment.

  In the second embodiment, the following effects can be obtained.

  In the second embodiment, as described above, in the suction passage 201, the tubular member 250 is configured in a state where the suction ports 51 to 54 and the discharge port 55 are connected to the common passage portion 256. As a result, the suction passage 201 (tubular member 250) does not include the partition wall portion 56 (see FIG. 1) that divides the inside of the tubular member 50 (see FIG. 1) into an upper stage and a lower stage as in the first embodiment. Even if it is a simple structure, it can suppress easily that the oil contained in blowby gas is sucked into the suction passage 1 with blowby gas. Further, even when some oil is sucked into the suction passage 1 together with the blow-by gas, it can be discharged into the crankcase 11c through the discharge port 55. It can suppress that gas is collected. The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

(Third embodiment)
Next, a third embodiment will be described with reference to FIGS. 1 and 8. In the third embodiment, unlike the first embodiment in which the suction passage 1 (see FIG. 1) is configured by the suction ports 51 to 54 that are expanded in a trumpet shape (conical shape having a hollow shape), the step shape is different. A description will be given of an example in which the suction passage 301 (tubular member 350) is configured by suction ports 351 to 354 having diameters that are increased stepwise (two steps). In the figure, components similar to those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.

  In the blow-by gas collection system 300 according to the third embodiment of the present invention, as shown in FIG. 8, the blow-by gas discharged from the four cylinders 10 a is put into the suction passage 301 in the tubular member 350 constituting the suction passage 301. Suction ports 351, 352, 353 and 354 for suction are provided. In addition, the suction ports 351 to 354 have a relatively larger opening area (a cross-sectional area through which blow-by gas passes) toward the upstream side of the blow-by gas flowing through the suction passage 301. That is, the opening area of the suction port 351 disposed on the other side (X2 side) of the engine body 11 is the largest, and the opening area of the suction port 354 disposed on one side (X1 side) of the engine body 11 is the smallest.

  Here, in the third embodiment, the description will be given by taking the X2 side suction port 351 as an example. The suction port 351 has an opening area (blow-by gas passes) in the blow-by gas suction direction (arrow Z1 direction). The cross-sectional area has a vertical cross-sectional shape that gradually decreases (stepwise). Also in this case, in the suction port 351 that opens while the opening area is gradually expanded downward, the area where the suction of blow-by gas including oil is started is relatively large, so the flow rate decreases. Blow-by gas is sucked in the state that was made. Therefore, the amount of oil sucked into the blowby gas (flowed into the suction passage 301) is reduced.

  Then, the suction port 351 gradually increases the gas flow rate when the blow-by gas with the reduced amount of oil is sucked in by reducing the opening area relatively toward the blow-by gas suction direction (arrow Z1 direction). I am letting. The suction ports 352 to 354 also have a longitudinal cross-sectional shape such that the opening area (cross-sectional area through which blow-by gas passes) gradually decreases toward the blow-by gas suction direction (arrow Z1 direction), Similar to the suction port 351, the oil contained in the blow-by gas is difficult to be sucked into the suction passage 301. In addition, the other structure of the blowby gas collection system 300 by 3rd Embodiment is the same as that of the said 1st Embodiment.

  In the third embodiment, the following effects can be obtained.

  In the third embodiment, as described above, the suction ports 351 to 354 are configured to have a shape in which the opening area gradually decreases in the blow-by gas suction direction. Thereby, in the area | region where the suction of blow-by gas containing oil is started in the suction inlets 351-354, since the opening area is relatively large, the suction speed (gas flow velocity) of blow-by gas can be reduced. Accordingly, it is possible to reduce the amount of oil sucked into the blowby gas (flowed into the suction passage 1). Further, since the suction ports 351 to 354 are formed so that the opening area becomes relatively small in the blow-by gas suction direction, the gas flow rate when the blow-by gas with the reduced amount of oil is sucked is gradually increased. Therefore, the blow-by gas in the crankcase 11c can be sucked in efficiently. The remaining effects of the third embodiment are similar to those of the aforementioned first embodiment.

(Modification of the third embodiment)
Next, a modification of the third embodiment will be described with reference to FIGS. 1 and 9. In the modified example of the third embodiment, the suction passage 1 (see FIG. 1) is configured so that the outlet portion 55a of the discharge port 55 (see FIG. 1) is located above the oil level. Differently, an example in which the suction passage 301a (tubular member 350a) is configured so that the outlet portion 355a of the discharge port 355 extends below the oil surface 305 of the oil stored in the oil reservoir 11d will be described. In the figure, components similar to those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.

  In the blow-by gas collection system 300a according to the modification of the third embodiment of the present invention, as shown in FIG. 9, in the suction passage 301a, the discharge port 355 having the outlet portion 355a is the end portion 50b on the X1 side of the tubular member 350a. Is provided. The outlet portion 355a extends below the oil level 305 of oil stored in the oil reservoir 11d with the discharge port 355 extending downward. Accordingly, the outlet portion 355a is immersed in oil. In addition, the other structure of the blowby gas collection system 300a by the modification of 3rd Embodiment is the same as that of the said 1st Embodiment.

  In the modification of the third embodiment, the following effects can be obtained.

  In the modification of the third embodiment, as described above, the outlet 355 is configured such that the outlet portion 355a extends to a position lower than the oil level 305 of the oil accumulated in the oil reservoir 11d of the engine 10. Thereby, since the discharge port 355 communicates with the oil stored in the oil reservoir 11d, when the blow-by gas containing oil is sucked from the suction ports 351 to 354, the oil collected in the discharge port 355, The oil stored in the oil reservoir 11d can be easily sucked out. That is, the oil accumulated in the discharge port 355 can be quickly and continuously discharged to the oil reservoir 11d. The remaining effects of the modification of the third embodiment are similar to those of the aforementioned first embodiment.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIGS. 1 and 10. In the fourth embodiment, unlike the first embodiment in which the suction passage 1 (see FIG. 1) is configured by the suction ports 51 to 54 that are expanded in a trumpet shape (conical frustum shape having a hollow), the longitudinal sectional shape is different. An example in which the suction passage 401 (tubular member 450) is configured by suction ports 451 to 454 having an L-shape will be described. In the figure, components similar to those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.

  In the blow-by gas collection system 400 according to the fourth embodiment of the present invention, as shown in FIG. 10, the blow-by gas discharged from the four cylinders 10 a is put into the suction passage 401 in the tubular member 450 constituting the suction passage 401. Suction ports 451, 452, 453, and 454 for suction are provided. In addition, the suction ports 451 to 454 each have an L-shaped longitudinal section and extend in a tubular shape, and the pipe wall portions 451a to 451a to the side of the suction ports 451 to 454 having the L shape near the oil surface 405. 454a is arrange | positioned so that the oil surface 405 may be covered from upper direction. Further, the L-shaped tube wall portions 451a to 454a extend in a direction (arrow X2 direction) from the end portion 50b toward the end portion 50a, and the suction ports 451 to 454 are orthogonal to the oil surface 405. It opens in the X2 direction. Moreover, the front-end | tip part of tube wall part 451a-454a is formed in the taper shape (taper shape).

  Thus, in the fourth embodiment, when blow-by gas containing oil is sucked from the suction ports 451 to 454, the blow-by gas is circulated in the horizontal direction (arrow X1 direction) on the inner side surfaces of the tube wall portions 451a to 454a. The The blow-by gas collides with the inner side surface at the portion of the inner side surface 451b where the tube wall portions 451a to 454a turn upward by about 90 degrees from the horizontal direction (arrow Z1 direction). It is configured to be sucked into the gas passage 57). In addition, oil is separated from blow-by gas that has collided with the inner surface 451b. The separated oil (oil droplets) is dropped from the distal ends of the tapered tube wall portions 451a to 454a to the oil reservoir 11d. In addition, the other structure of the blowby gas collection system 400 by 4th Embodiment is the same as that of the said 1st Embodiment.

  In the fourth embodiment, the following effects can be obtained.

  In the fourth embodiment, as described above, the suction ports 451 to 454 are configured so that the longitudinal section has an L shape and extends in a tubular shape. And the pipe wall part 451a-454a of the side close | similar to the oil level 405 of each of the inlets 451-454 which have L shape is arrange | positioned so that the oil level 405 may be covered from upper direction. As a result, the suction ports 451 to 454 (openings communicating with the suction passage 401) do not face the oil surface 405 in the Z direction, so that the oil falling from the cylinder 10a or the rotation of the crankshaft 90 in the direction of the arrow R It is possible to easily suppress the oil that has been stirred up and splashed up in the reservoir portion 11d from being directly sucked through the suction ports 451 to 454. Further, even when the splashed oil is sucked into the suction ports 451 to 454, since the longitudinal section has an L shape and extends in a tubular shape, the oil is L in the suction ports 451 to 454. The oil (oil mist) can be separated from the blow-by gas by colliding with a portion of the inner side surface 451b of the tube wall portions 451a to 454a whose direction changes to a letter shape. As a result, the amount of oil sucked into the blow-by gas (flowed into the suction passage 401) can be effectively reduced. The remaining effects of the fourth embodiment are similar to those of the aforementioned first embodiment.

(Modification of the fourth embodiment)
Next, a modification of the fourth embodiment will be described with reference to FIGS. 10 and 11. In the modified example of the fourth embodiment, unlike the fourth embodiment in which the suction ports 451 to 454 (see FIG. 10) are configured such that the tube wall portions 451a to 454a extend in the horizontal direction (X direction), the tube wall An example in which the suction ports 461 to 464 in the suction passage 401a (tubular member 450a) are configured so that the portions 461a to 464a extend slightly obliquely downward from the horizontal direction will be described. In the figure, components similar to those in the fourth embodiment are denoted by the same reference numerals as those in the fourth embodiment.

  In the blow-by gas collection system 400a according to the modification of the fourth embodiment of the present invention, as shown in FIG. 11, in the suction passage 401a, each of the suction ports 461 to 464 extends slightly diagonally downward from the horizontal direction. Tube wall portions 461a to 464a are configured. In this case, the inner side surfaces 461b of the tube wall portions 461a to 464a are formed so as to have an ascending gradient along the blow-by gas suction direction (arrow X1 direction). Therefore, when blow-by gas sucked into the suction ports 461 to 464 collides with the portion of the inner side surface 461c that has turned upward in the tube wall portions 461a to 464a, the separated oil (oil mist) is separated from the tube wall portion 461a. The inner side surface 461b inclined by ˜464a is slid down obliquely downward and returned to the oil reservoir 11d. In addition, the other structure of the blowby gas collection system 400a by the modification of 4th Embodiment is the same as that of the said 1st Embodiment.

  In the modification of the fourth embodiment, the following effects can be obtained.

  In the modified example of the fourth embodiment, as described above, in the suction passage 401a, the pipe wall portions 461a to 464a in each of the suction ports 461 to 464 are configured to extend slightly obliquely downward from the horizontal direction. . As a result, when blow-by gas sucked into the suction ports 461 to 464 collides with the portion of the inner side surface 461c that has turned upward above the tube wall portions 461a to 464a, the separated oil (oil mist) becomes the tube wall portion. The inclined inner side surfaces 461b of 461a to 464a can be easily slid downward and returned to the oil reservoir 11d. Also by this, the amount of oil sucked into the blow-by gas (flowed into the suction passage) can be effectively reduced. The remaining effects of the modification of the fourth embodiment are similar to those of the aforementioned first embodiment.

  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, the first and second embodiments are provided with suction ports 51 to 54 that open downward in a trumpet shape (conical shape having a hollow), and the third embodiment has a stepped shape downward. In the fourth embodiment, the suction ports 451 to 454 whose longitudinal cross-sectional shape is L-shaped are provided, and the oil contained in the blow-by gas is sucked into the suction passage. 1 (201, 301, 401) shows an example in which a shape that is difficult to suck in is shown, but the present invention is not limited to this. That is, if the “suction port” of the present invention has a shape that makes it difficult for oil contained in blow-by gas to be sucked into the suction passage, the “suction port” of the present invention has a vertical cross-sectional shape other than the above embodiment. You may form suitably.

  Further, in the first to fourth embodiments and the modified examples in each of the embodiments, an example in which four “suction ports” of the present invention are provided for one suction passage has been shown. Not limited. That is, the number of “suction ports” installed is appropriately changed according to the necessary ventilation amount of blow-by gas in the crankcase 11c.

  Further, in the first to fourth embodiments and the modifications in each embodiment, in the suction passage 1 (101a, 101b, 201, 301, 301a, 401, 401a), the opening area (bore diameter) increases as the distance from the guide passage 2 increases. ), An example in which the “suction ports” of the present invention are sequentially arranged so as to increase is shown, but the present invention is not limited to this. The opening area (bore diameter) of the “suction port” of the present invention may be constant regardless of the flow direction of blow-by gas.

  Moreover, in the said 1st-4th embodiment and the modification in each embodiment, although shown about the example which comprised the suction passage 1 (101a, 101b, 201, 301, 301a, 401, 401a) using the resin member. The present invention is not limited to this. The “suction passage” of the present invention may be configured using a metallic tubular member.

  Moreover, in the said 1st-4th embodiment and the modification in each embodiment, although the example which applies the blowby gas collection system 100-400a to the engine 10 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-cylinder engine as long as the engine includes a plurality of cylinders 10a 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 1st-4th embodiment and the modification in each embodiment, although shown about the example which applied this invention to the blowby gas collection systems 100-400a of the engine 10 for motor vehicles consisting of a gasoline engine, this invention is shown. Is not limited to this. That is, if it is an internal combustion engine, the present invention may be applied to gas engines other than gasoline engines (internal combustion engines such as diesel engines and gas engines). Further, the present invention may be applied to a blow-by gas collection system for an internal combustion engine that is fixedly installed as a drive source (power source) for equipment other than for automobiles.

  Further, in the first to fourth embodiments and the modified examples in each embodiment, the example in which the four suction ports 51 to 54 are provided in the suction passage 1 so as to correspond to the four cylinders 10a is shown. The present invention is not limited to this. In the present invention, one suction port 51 may be provided in the suction passage 1, or a plurality of suction ports 51 other than four may be provided regardless of the number of cylinders 10a. Further, in the configuration in which a plurality of suction ports are provided, even when the opening areas of the plurality of suction ports are the same as each other, the suction area is relatively large toward the upstream side of the blow-by gas flowing through the suction passage 1. The arrangement density of the plurality of suction ports may be relatively increased with respect to the downstream side of the suction passage 1 toward the upstream side of the passage 1.

  Further, in the first to fourth embodiments and the modifications in each embodiment, the example in which the engine 10 is configured by applying the inertial collision type separator unit 70 and the cyclone type separator unit 80 has been described. Is not limited to this. In the present invention, the engine 10 may be configured using an oil separator other than the inertial collision separator and the cyclone separator.

  Further, in the first to fourth embodiments and the modifications in each embodiment, the “suction passage” of the present invention is provided with a tubular member 50 (150, 160, 250, 350, 150, formed separately from the engine body 11). Although examples are shown using 350a, 450, 450a), the present invention is not limited to this. In the present invention, the “suction passage” may be formed integrally with the crankcase 11 c in the engine body 11.

  Further, in the first to fourth embodiments and the modifications in each embodiment, the example in which the metal TCC 20 is attached to the engine body 11 has been described, but the present invention is not limited to this. In the present invention, a resin timing chain cover may be attached to the engine body 11.

  Further, in the first to fourth embodiments and the modifications in each embodiment, the example in which the resin head cover 30 is attached to the cylinder head 11a has been described, but the present invention is not limited to this. In the present invention, a metal head cover such as iron, aluminum, or magnesium may be attached to the cylinder head 11a.

  Moreover, in the said 1st-4th embodiment and the modification in each embodiment, although the example which provides the resin-made air intake apparatus 40 was shown, this invention is not limited to this. In the present invention, a metal intake device such as iron or aluminum may be used.

1, 101a, 101b, 201, 301, 301a, 401, 401a Suction passage 2 Guide passage 3 Upper passage 4 Side passage 10 Engine (internal combustion engine)
10a Cylinder 11 Engine body 11c Crankcase 11d Oil reservoir 20 Timing chain cover (TCC)
40 Intake device 50, 150, 160, 250, 350, 350a, 450, 450a Tubular member 51-54, 351-354, 451-454, 461-464 Intake port 55, 155, 165a-165d, 355 Discharge port 55a, 155a, 165e, 355a Outlet part 55b Root part (parts other than the outlet part of the outlet)
56 Bulkhead 57 Blow-by gas passage 58 Oil passage 59 Communication hole 100, 100a, 100b, 200, 300, 300a, 400, 400a Blow-by gas collection system 305, 405 Oil level 451a-454a, 461a-464a Tube wall

Claims (5)

An intake port provided in the internal combustion engine for sucking blow-by gas including oil discharged from the cylinder, and an exhaust for discharging oil contained in the blow-by gas sucked from the suction port into the internal combustion engine. A suction passage including an outlet;
A guide passage for guiding the blow-by gas sucked into the suction passage from the suction port to the intake air introduced into the cylinder;
The suction port of the suction passage has a shape in which oil contained in blow-by gas is difficult to be sucked into the suction passage ,
The suction passage includes a blow-by gas passage for guiding blow-by gas sucked from the suction port to the guide passage, an oil passage for guiding oil contained in the blow-by gas to the discharge port, and the blow-by gas passage. And a partition wall partitioning the oil passage,
The partition wall portion penetrates the partition wall portion, that having a communication hole for communicating with said oil passage and said blow-by gas passage, blow-by gas collection system. The blow-by gas collection system according to claim 1, wherein the suction port has a shape in which an opening area decreases toward a blow-by gas suction direction. The suction port has an L-shaped longitudinal section and extends in a tubular shape,
2. The blow-by gas collection system according to claim 1, wherein a pipe wall portion closer to the oil level of the suction port having an L shape is arranged so as to cover the oil level from above. The blow-by gas collection system according to any one of claims 1 to 3 , wherein an opening area of an outlet portion of the discharge port is smaller than an opening area of a portion other than the outlet portion of the discharge port. Before Kirendoriana is provided at a position which does not overlap with the discharge port, the blow-by gas collection system according to claim 1.

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