Internal combustion engine for vehicle

Abstract

To restrain gas from being sucked from a suction passage.SOLUTION: An internal combustion engine 10 for a vehicle includes a cylinder 23A, an intake passage 10A, a crank chamber 10Z, a suction passage 80Z, and an introduction passage 60Z. The intake passage 10A introduces intake air into the cylinder 23A. The crank chamber 10Z stores a crankshaft 33. The crank chamber 10Z reserves oil. The suction passage 80Z sucks oil reserved in the crank chamber 10Z. The introduction passage 60Z introduces a part of the intake air flowing through the intake passage 10A into the crank chamber 10Z. The introduction passage 60Z includes a main passage 63Z and a plurality of outlet passages 64Z. The main passage 63Z extends from the outside of the crank chamber 10Z to the inside of the crank chamber 10Z. The outlet passage 64Z discharges the intake air flowing through the main passage 63Z. The outlet passage 64A extends from the main passage 63Z toward the suction passage 80Z when viewed from a direction along a vertical axis of the vehicle.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an internal combustion engine for a vehicle. [Background technology]

[0002] The internal combustion engine of Patent Document 1 includes a cylinder, an intake passage, an exhaust passage, a crank chamber, and a crankshaft. The cylinder is a space for burning a mixture of fuel and intake air. The intake passage introduces intake air into the cylinder. The exhaust passage discharges exhaust gas from the cylinder. The crank chamber houses the crankshaft. The crank chamber also stores oil. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-112178 Summary of the Invention [Problem to be solved by the invention]

[0004] An internal combustion engine such as that described in Patent Document 1 generally includes a suction passage that draws oil from the crankcase. The oil drawn from the inlet of the suction passage is then supplied to various components of the internal combustion engine. In a vehicle equipped with such an internal combustion engine, the inlet of the suction passage may become exposed to the oil, for example, when the vehicle accelerates, decelerates, or turns. As a result, there is a risk that gas such as air may be drawn in through the inlet of the suction passage. [Means for solving the problem]

[0005] A vehicle internal combustion engine for solving the above problem is an internal combustion engine for a vehicle comprising: cylinders; an intake passage for introducing intake air into the cylinders; a crank chamber that accommodates a crankshaft and stores oil; a suction passage for sucking the oil stored in the crank chamber; and an introduction passage for introducing a portion of the intake air flowing through the intake passage into the crank chamber, wherein the introduction passage comprises a main passage that leads from the outside of the crank chamber to the inside of the crank chamber, and a plurality of outlet passages that discharge the intake air that has flowed through the main passage, and the outlet passages extend from the main passage toward the suction passage when viewed from a direction along the vertical axis of the vehicle. [Effects of the Invention]

[0006] According to the above configuration, it is possible to prevent gas from being sucked in through the inlet of the suction passage. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic diagram of an internal combustion engine. [Figure 2] FIG. 2 is an end view taken along line 2-2 in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] <General configuration of an internal combustion engine> An embodiment of the present invention will be described below with reference to Figs. 1 and 2. First, a schematic configuration of an internal combustion engine 10 mounted on a vehicle will be described. In this embodiment, the internal combustion engine 10 is an internal combustion engine that uses hydrogen as fuel. In the following description, the up and down directions refer to the directions when the internal combustion engine 10 is mounted on a vehicle. An example of the vehicle is a passenger car.

[0009] 1, the internal combustion engine 10 includes a head cover 21, a cylinder head 22, a cylinder block 23, a crankcase 24, and an oil pan 25. The internal combustion engine 10 also includes a plurality of pistons 31, a plurality of connecting rods 32, a crankshaft 33, an intake pipe 41, and an exhaust pipe 42.

[0010] The cylinder block 23 has four cylinders 23A and four upper spaces 23B as internal spaces of the cylinder block 23. The cylinders 23A extend from the upper end of the cylinder block 23 to near the center in the vertical direction. The cylinders 23A are spaces for burning a mixture of fuel and intake air. The upper spaces 23B extend from the lower ends of the cylinders 23A to the lower end of the cylinder block 23. Pistons 31 are located inside the cylinders 23A. The pistons 31 are connected to a crankshaft 33 via connecting rods 32. The pistons 31 reciprocate inside the cylinders 23A as the mixture of fuel and intake air burns in the cylinders 23A. The reciprocating motion of the pistons 31 rotates the crankshaft 33. Note that FIG. 1 shows only one cylinder 23A as a representative.

[0011] The crankcase 24 is connected to the lower end of the cylinder block 23. The crankcase 24 has a so-called ladder frame structure. Therefore, the crankcase 24 has four lower spaces 24A as internal spaces of the crankcase 24. The lower spaces 24A extend from the upper end to the lower end of the crankcase 24. The lower spaces 24A are connected to the lower ends of the upper spaces 23B. The cylinder block 23 and the crankcase 24 rotatably support the crankshaft 33 sandwiched between them.

[0012] The oil pan 25 is connected to the lower end of the crankcase 24. The oil pan 25 is shaped like a generally rectangular box with a bottom. Therefore, the oil pan 25 has an oil space 25A as an internal space of the oil pan 25. The oil space 25A is a space for storing oil. The oil stored in the oil space 25A is supplied to each part of the internal combustion engine 10 by a pump (not shown). In this embodiment, the upper space 23B of the cylinder block 23, the lower space 24A of the crankcase 24, and the oil space 25A of the oil pan 25 form a crank chamber 10Z of the internal combustion engine 10. The crank chamber 10Z accommodates most of the crankshaft 33.

[0013] The cylinder head 22 is connected to the upper end of the cylinder block 23. The cylinder head 22 has four intake ports 22A, four exhaust ports 22B, and four combustion recesses 22C as an internal space of the cylinder head 22. The combustion recesses 22C are recessed upward from the lower surface of the cylinder head 22. The combustion recesses 22C are connected to the upper ends of the cylinders 23A. The combustion recesses 22C, the cylinders 23A, and the pistons 31 define a combustion chamber 10C.

[0014] A first end of the intake port 22A is connected to the combustion recess 22C. A second end of the intake port 22A opens to a side surface of the cylinder head 22. An intake pipe 41 is connected to the second end of the intake port 22A. The intake pipe 41 introduces intake air from outside the internal combustion engine 10 into the intake port 22A. The intake port 22A introduces the intake air that has flowed through the intake pipe 41 into the cylinder 23A. In this embodiment, the space formed by the intake port 22A and the intake pipe 41 is the intake passage 10A.

[0015] A first end of the exhaust port 22B is connected to the combustion recess 22C. A second end of the exhaust port 22B opens to a side surface of the cylinder head 22. An exhaust pipe 42 is connected to the second end of the exhaust port 22B. The exhaust port 22B discharges exhaust from the cylinder 23A to the exhaust pipe 42. The exhaust pipe 42 discharges the exhaust that has flowed through the exhaust port 22B to the outside of the internal combustion engine 10. In this embodiment, the space formed by the exhaust port 22B and the exhaust pipe 42 is the exhaust passage 10B.

[0016] The head cover 21 is connected to the upper end of the cylinder head 22. The head cover 21 covers the cylinder head 22. The head cover 21, together with the cylinder head 22, defines an accommodation space 21A. The accommodation space 21A accommodates a valve mechanism and the like (not shown).

[0017] The internal combustion engine 10 includes a plurality of intake valves 34 , a plurality of exhaust valves 35 , a plurality of fuel injection valves 36 , and a plurality of ignition devices 37 . The intake valve 34 is located at the connection between the intake port 22A and the combustion recess 22C. The intake valve 34 opens and closes the downstream end of the intake port 22A using power from a valve mechanism (not shown). The exhaust valve 35 is located at the connection between the exhaust port 22B and the combustion recess 22C. The exhaust valve 35 opens and closes the upstream end of the exhaust port 22B using power from a valve mechanism (not shown).

[0018] The tip of the fuel injection valve 36 is located midway through the intake port 22A. The fuel injection valve 36 is supplied with hydrogen stored in a fuel tank (not shown). The fuel injection valve 36 injects hydrogen as fuel into the intake port 22A. As a result, hydrogen is supplied to the cylinder 23A via the intake port 22A and the combustion recess 22C. The tip of the ignition device 37 is located in the combustion recess 22C. The ignition device 37 ignites the mixture of fuel and intake air by spark discharge.

[0019] The internal combustion engine 10 includes a throttle valve 38, a plurality of water injection valves 39, an air cleaner 46, a turbocharger 47, and an intercooler 48. The turbocharger 47 includes a compressor wheel 47A, a connecting shaft 47B, and a turbine wheel 47C. The compressor wheel 47A is located midway through the intake pipe 41. A first end of the connecting shaft 47B is connected to the compressor wheel 47A. A second end of the connecting shaft 47B is connected to the turbine wheel 47C. The turbine wheel 47C is located midway through the exhaust pipe 42. When the turbine wheel 47C rotates due to the flow of exhaust gas through the exhaust pipe 42, the compressor wheel 47A rotates together with the turbine wheel 47C via the connecting shaft 47B. As a result, intake air compressed by the compressor wheel 47A is supplied to the intake pipe 41 downstream of the compressor wheel 47A. In other words, the compressor wheel 47A of the turbocharger 47 is located in the intake passage 10A, and compresses the intake air flowing through the intake passage 10A and supplies it downstream. The turbocharger 47 is an example of a supercharger.

[0020] The air cleaner 46 is located in the intake pipe 41 at a portion upstream of the compressor wheel 47A. The air cleaner 46 collects foreign matter contained in the intake air flowing through the intake pipe 41. The intercooler 48 is located in the intake pipe 41 at a portion downstream of the compressor wheel 47A. The intercooler 48 cools the intake air compressed by the compressor wheel 47A. The throttle valve 38 is located in the intake pipe 41 at a portion downstream of the intercooler 48. The throttle valve 38 adjusts the amount of intake air flowing through the intake pipe 41.

[0021] The tip of the water injector 39 is located midway through the intake port 22A. Water stored in a water tank (not shown) is supplied to the water injector 39. The water injector 39 injects water into the intake port 22A. When the injected water evaporates, the intake port 22A is cooled, thereby cooling the intake air introduced from the intake port 22A into the cylinder 23A.

[0022] As shown in FIG. 1 , the internal combustion engine 10 includes a strainer 81, a suction pipe 82, and an oil pump 83. In this embodiment, the oil pump 83 is attached to the crankcase 24. The oil pump 83 is a so-called mechanical pump that operates using power from the crankshaft 33. A first end of the suction pipe 82 is connected to the oil pump 83. A portion of the suction pipe 82, including its second end, is located in the crankcase 10Z. A portion of the suction pipe 82, including its second end, extends generally downward. The second end of the suction pipe 82 is connected to the strainer 81. The strainer 81 has a function of removing foreign matter contained in the oil. A lower end of the strainer 81 is spaced apart from the bottom surface of the oil pan 25. Basically, the strainer 81 is located inside the oil stored in the crankcase 10Z. In this embodiment, the strainer 81 is located near one side of the oil pan 25 with respect to the rotational axis of the crankshaft 33, i.e., on the right side in FIG. 1. When the oil pump 83 operates, oil in the crank chamber 10Z is sucked through the strainer 81. The oil sucked through the strainer 81 is then supplied to each part of the internal combustion engine 10 via a suction pipe 82 and the oil pump 83. In this embodiment, the space defined by the strainer 81 and the suction pipe 82 is a suction passage 80Z. The strainer 81 also defines the entrance of the suction passage 80Z.

[0023] 1, the internal combustion engine 10 includes a blow-by gas treatment device 50. The blow-by gas treatment device 50 includes a first inlet pipe 61, a second inlet pipe 62, a third inlet pipe 63, a plurality of fourth inlet pipes 64, and a separator 65.

[0024] The separator 65 is located inside the accommodation space 21A. The separator 65 collects oil contained in the gas flowing inside the separator 65. A first end of the first lead-in pipe 61 is connected to the separator 65. A second end of the first lead-in pipe 61 is connected to a portion of the intake pipe 41 that is downstream of the compressor wheel 47A and upstream of the intercooler 48. In other words, the second end of the first lead-in pipe 61 is connected to a portion of the intake passage 10A that is downstream of the turbocharger and upstream of the throttle valve 38.

[0025] A first end of the second introduction pipe 62 is connected to the separator 65. A second end of the second introduction pipe 62 is located near the oil pan 25. The second end of the second introduction pipe 62 is connected to a first end of the third introduction pipe 63.

[0026] As shown in FIG. 1, the third inlet pipe 63 has a generally cylindrical shape. The third inlet pipe 63 extends in a direction perpendicular to the vertical axis of the vehicle. In this embodiment, the third inlet pipe 63 extends along the rotational axis of the crankshaft 33. The third inlet pipe 63 is located on the opposite side of the rotational axis of the crankshaft 33 from the strainer 81, i.e., on the left side in FIG. 1. The third inlet pipe 63 is located slightly above the upper limit of the designed oil upper surface of the crank chamber 10Z, i.e., the upper limit of the oil level. As shown in FIG. 2, the third inlet pipe 63 penetrates a wall portion of the oil pan 25 that defines the crank chamber 10Z. That is, a first end of the third inlet pipe 63 is located outside the crank chamber 10Z. A second end of the third inlet pipe 63 is located inside the crank chamber 10Z. In other words, the third inlet pipe 63 extends from the outside of the crank chamber 10Z to the inside of the crank chamber 10Z. The second end of the third inlet pipe 63 is located near a portion of the wall of the oil pan 25 that faces the portion through which the third inlet pipe 63 passes. In this embodiment, the space defined by the third inlet pipe 63 is a main passage 63Z.

[0027] 2, in this embodiment, the blow-by gas treatment device 50 is provided with four fourth introduction pipes 64. In the following, when the four fourth introduction pipes 64 are to be described separately, they are referred to as fourth introduction pipe 64A, fourth introduction pipe 64B, fourth introduction pipe 64C, and fourth introduction pipe 64D. When the four fourth introduction pipes 64 are to be described collectively, they are simply referred to as fourth introduction pipe 64.

[0028] 2, when viewed from the direction along the vertical axis of the vehicle, the fourth inlet pipe 64A extends from the third inlet pipe 63 toward the suction pipe 82. The fourth inlet pipe 64A is located near the second end of the third inlet pipe 63.

[0029] When viewed from a direction along the vertical axis of the vehicle, the fourth inlet pipe 64B extends from the third inlet pipe 63 toward the suction pipe 82. The fourth inlet pipe 64B is located closer to the first end of the third inlet pipe 63 than the fourth inlet pipe 64A.

[0030] When viewed from a direction along the vertical axis of the vehicle, the fourth inlet pipe 64C extends from the third inlet pipe 63 toward the suction pipe 82. The fourth inlet pipe 64C is located closer to the first end of the third inlet pipe 63 than the fourth inlet pipe 64B.

[0031] When viewed from a direction along the vertical axis of the vehicle, the fourth inlet pipe 64D extends from the third inlet pipe 63 toward the suction pipe 82. The fourth inlet pipe 64D is located closer to the first end of the third inlet pipe 63 than the fourth inlet pipe 64C.

[0032] In this embodiment, the space defined by the fourth inlet pipe 64 is an outlet passage 64Z that discharges the intake air that has flowed through the main passage 63Z. Therefore, the outlet passage 64Z extends from the main passage 63Z toward the suction passage 80Z when viewed along the vertical axis of the vehicle. In this embodiment, the suction passage 80Z is located on an extension of the direction in which the outlet passage 64Z extends from the main passage 63Z.

[0033] Here, when viewed from the direction along the vertical axis of the vehicle, the imaginary line LV is defined as the imaginary line connecting the third inlet pipe 63 and the suction pipe 82 at the shortest distance. In other words, when viewed from the direction along the vertical axis of the vehicle, the imaginary line LV is defined as the imaginary line connecting the main passage 63Z and the suction passage 80Z at the shortest distance. In this case, of the four fourth inlet pipes 64, the fourth inlet pipes 64A and 64B are located in a region on the second end side of the third inlet pipe 63 with respect to the imaginary line LV when viewed from the direction along the vertical axis of the vehicle. In other words, two of the four outlet passages 64Z are located on one side of the imaginary line LV when viewed from the direction along the vertical axis of the vehicle. Furthermore, of the four fourth inlet pipes 64, the fourth inlet pipes 64C and 64D are located in a region on the first end side of the third inlet pipe 63 with respect to the imaginary line LV when viewed from the direction along the vertical axis of the vehicle. In other words, two of the four exit passages 64Z are located in the other region with respect to the imaginary line LV when viewed from the direction along the vertical axis of the vehicle.

[0034] In this embodiment, the space partitioned by the first inlet pipe 61, the second inlet pipe 62, the third inlet pipe 63, the multiple fourth inlet pipes 64, and the separator 65 is an inlet passage 60Z that introduces a portion of the intake air flowing through the intake passage 10A into the crank chamber 10Z.

[0035] As shown in FIG. 1, the blow-by gas treatment device 50 includes a first discharge pipe 71, a second discharge pipe 72, and a separator 73. The separator 73 is located inside the accommodation space 21A. The separator 73 collects oil contained in the gas flowing inside the separator 73. A first end of the first discharge pipe 71 is connected to the separator 73. A second end of the first discharge pipe 71 is connected to the crank chamber 10Z. A first end of the second discharge pipe 72 is connected to the separator 73. A second end of the second discharge pipe 72 is connected to a portion of the intake pipe 41 that is upstream of the compressor wheel 47A and downstream of the air cleaner 46. In other words, the second end of the second discharge pipe 72 is connected to a portion of the intake passage 10A that is upstream of the turbocharger.

[0036] In this embodiment, the space defined by the first discharge pipe 71, the second discharge pipe 72, and the separator 73 is a discharge passage 70Z that discharges gas present in the crank chamber 10Z to the intake passage 10A.

[0037] <Operation of this embodiment> When the internal combustion engine 10 is operating, the compressor wheel 47A of the turbocharger 47 compresses the intake air flowing through the intake passage 10A in response to the flow of exhaust gas through the exhaust pipe 42 and supplies the compressed air downstream. As a result, the pressure in the intake passage 10A downstream of the compressor wheel 47A becomes higher than the pressure in the intake passage 10A upstream of the compressor wheel 47A. Some of the intake air flowing through the intake passage 10A is introduced into the crank chamber 10Z through the space defined by the first inlet pipe 61, the separator 65, the second inlet pipe 62, the third inlet pipe 63, and the plurality of fourth inlet pipes 64, i.e., through the inlet passage 60Z. When the intake air is introduced into the crank chamber 10Z through the inlet passage 60Z as described above, the pressure in the crank chamber 10Z increases accordingly. The gas present in the crank chamber 10Z is then discharged through the space defined by the first discharge pipe 71, the separator 73, and the second discharge pipe 72, i.e., through the discharge passage 70Z, to the upstream portion of the intake passage 10A relative to the compressor wheel 47A.

[0038] <Effects of this embodiment> (1) As shown in FIG. 2, when viewed along the vehicle's vertical axis, the fourth inlet pipe 64 extends from the third inlet pipe 63 toward the suction pipe 82. In other words, when viewed along the vehicle's vertical axis, the outlet passage 64Z extends from the main passage 63Z toward the suction passage 80Z. Therefore, as indicated by the dashed-dotted arrow in FIG. 2, the intake air that has flowed through the inlet passage 60Z flows from the outlet passage 64Z of the inlet passage 60Z toward the suction passage 80Z. Furthermore, the intake air from the multiple outlet passages 64Z flows toward the suction passage 80Z. This flow of intake air from the outlet passage 64Z toward the suction passage 80Z causes oil stored in the crank chamber 10Z to collect near the suction passage 80Z. As a result, even in a situation where the amount of oil near the suction passage 80Z may decrease due to, for example, the vehicle accelerating or decelerating or turning, the oil collects as described above, preventing the entrance of the suction passage 80Z from being exposed to the oil. As a result, gas is prevented from being sucked in through the entrance of the suction passage 80Z, i.e., through the strainer 81.

[0039] (2) As shown in FIG. 1, the first introduction pipe 61 is connected to a portion of the intake pipe 41 downstream of the compressor wheel 47A. In other words, the introduction passage 60Z is connected to a portion of the intake passage 10A downstream of the turbocharger. As described above, the pressure in the portion of the intake passage 10A downstream of the compressor wheel 47A is relatively high. Therefore, the flow rate of the intake air introduced into the crank chamber 10Z through the introduction passage 60Z is high. As a result, the flow of intake air from the outlet passage 64Z toward the suction passage 80Z makes it easy for oil stored in the crank chamber 10Z to collect near the suction passage 80Z.

[0040] (3) As shown in FIG. 1 , the first introduction pipe 61 is connected to a portion of the intake pipe 41 that is downstream of the compressor wheel 47A and upstream of the intercooler 48. In other words, the introduction passage 60Z is connected to a portion of the intake passage 10A that is downstream of the turbocharger and upstream of the throttle valve 38. Here, the pressure in the portion of the intake passage 10A to which the introduction passage 60Z is connected tends to be higher than, for example, a portion of the intake passage 10A downstream of the throttle valve 38. This allows the flow velocity of intake air introduced into the crank chamber 10Z through the introduction passage 60Z to be further increased compared to a case in which the introduction passage 60Z is connected to a portion of the intake passage 10A downstream of the throttle valve 38.

[0041] (4) As shown in FIG. 1, the second discharge pipe 72 is connected to a portion of the intake pipe 41 that is upstream of the compressor wheel 47A and downstream of the air cleaner 46. In other words, the discharge passage 70Z is connected to a portion of the intake passage 10A that is upstream of the turbocharger. As described above, intake air is introduced into the crank chamber 10Z through the introduction passage 60Z, which increases the pressure in the crank chamber 10Z accordingly. However, gas present in the crank chamber 10Z is discharged through the discharge passage 70Z to a portion of the intake passage 10A that is upstream of the compressor wheel 47A. This prevents the pressure in the crank chamber 10Z from becoming excessively high. This prevents the flow velocity of the intake air introduced into the crank chamber 10Z through the introduction passage 60Z from decreasing due to an excessive increase in the pressure in the crank chamber 10Z.

[0042] (5) As shown in Fig. 2, two of the four outlet passages 64Z are located on one side of the imaginary line LV when viewed along the vehicle's vertical axis. Also, two of the four outlet passages 64Z are located on the other side of the imaginary line LV when viewed along the vehicle's vertical axis. Therefore, compared to a case where all four outlet passages 64Z are located on one side of the imaginary line LV when viewed along the vehicle's vertical axis, oil from a wider area of ​​the crank chamber 10Z can be collected near the suction passage 80Z.

[0043] <Example of change> This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0044] In the above embodiment, the connection structure of the introduction passage 60Z with respect to the intake passage 10A may be changed. For example, the introduction passage 60Z may be connected to a portion of the intake passage 10A downstream of the throttle valve .

[0045] For example, the introduction passage 60Z may be connected to a portion of the intake passage 10A upstream of the turbocharger. As a specific example, if a configuration is adopted in which gas present in the crank chamber 10Z is discharged into the intake passage 10A using an ejector, the introduction passage 60Z may be connected to a portion of the intake passage 10A upstream of the turbocharger. An example of the above configuration is the configuration described in JP 2024-009617 A.

[0046] In the above embodiment, the connection structure of the exhaust passage 70Z with respect to the intake passage 10A may be changed. For example, the exhaust passage 70Z may be connected to a portion of the intake passage 10A that is downstream of the throttle valve .

[0047] In the above embodiment, the position of the outlet passage 64Z may be changed. For example, three or more of the four exit passages 64Z may be located in one region with respect to the imaginary line LV when viewed from the direction along the vertical axis of the vehicle, or three or more of the four exit passages 64Z may be located in the other region with respect to the imaginary line LV when viewed from the direction along the vertical axis of the vehicle.

[0048] In the above embodiment, the number of outlet passages 64Z may be changed. For example, the internal combustion engine 10 may be provided with three or fewer outlet passages 64Z, as long as the number is two or more. If the internal combustion engine 10 is provided with two or more outlet passages 64Z, it is easier for oil stored in the crank chamber 10Z to be collected near the suction passage 80Z than if the internal combustion engine 10 were provided with one outlet passage 64Z. Also, for example, the internal combustion engine 10 may be provided with five or more outlet passages 64Z.

[0049] In the above embodiment, the direction of the outlet passage 64Z can be changed. For example, when viewed from the direction along the vertical axis of the vehicle, if the outlet passage 64Z extends toward the side of the main passage 63Z where the suction passage 80Z is located, it can be said that the outlet passage 64Z extends from the main passage 63Z toward the suction passage 80Z. Therefore, the suction passage 80Z does not need to be located on an extension of the direction in which the outlet passage 64Z extends from the main passage 63Z.

[0050] In the above embodiment, the direction in which the main passage 63Z extends may be changed. For example, the main passage 63Z may extend obliquely with respect to the rotational axis of the crankshaft 33. As a specific example, the third inlet pipe 63 defining the main passage 63Z may extend so as to be positioned lower on the vehicle as it moves from the outside of the crank chamber 10Z toward the inside of the crank chamber 10Z. Also, for example, the third inlet pipe 63 may extend in a direction perpendicular to the vertical axis of the vehicle and perpendicular to the rotational axis of the crankshaft 33.

[0051] In the above embodiment, the members that form the main passage 63Z and the outlet passage 64Z may be changed. For example, the third inlet pipe 63, the plurality of fourth inlet pipes 64, and the oil pan 25 may be integrally formed by casting, etc. In other words, the oil pan 25 may have, as its internal space, a main passage 63Z and an outlet passage 64Z.

[0052] In the above embodiment, the positional relationship between the introduction passage 60Z and the suction passage 80Z may be changed. For example, the strainer 81 is not limited to being located near one side surface of the oil pan 25 relative to the rotational axis of the crankshaft 33, but may be located near the other side surface of the oil pan 25 relative to the rotational axis of the crankshaft 33. Also, for example, the third lead-in pipe 63 may be located near one side surface of the oil pan 25 relative to the rotational axis of the crankshaft 33. In other words, the positional relationship between the lead-in passage 60Z and the suction passage 80Z can be changed depending on the structure of the internal combustion engine 10, etc.

[0053] In the above embodiment, the configuration of the internal combustion engine 10 may be changed. For example, the supercharger is not limited to the turbocharger 47. As a specific example, the internal combustion engine 10 may be provided with a so-called supercharger as the supercharger.

[0054] For example, the fuel for the internal combustion engine 10 is not limited to hydrogen. As a specific example, the fuel for the internal combustion engine 10 may be gasoline, diesel, or the like. In other words, the present technology can be applied to engines other than hydrogen engines. [Explanation of symbols]

[0055] 10...internal combustion engine 10A...intake passage 10B...exhaust passage 10C...combustion chamber 10Z...crankcase 21...head cover 22...cylinder head 22A...intake port 22B...exhaust port 22C...combustion recess 23...cylinder block 23A...cylinder 24...crankcase 25...oil pan 31...piston 32...connecting rod 33...crankshaft 36...fuel injection valve 37...ignition device 38...throttle valve 39...water injection valve 41...intake pipe 42...exhaust pipe 46...air cleaner 47...turbocharger 47A...compressor wheel 47B...connecting shaft 47C...turbine wheel 48...intercooler 50...blow-by gas treatment device 60Z...inlet passage 61...first inlet pipe 62...second inlet pipe 63...third inlet pipe 63Z...Main passage 64...Fourth inlet pipe 64Z...Outlet passage 65...Separator 70Z...Discharge passage 71...First discharge pipe 72...Second discharge pipe 73...Separator 80Z...Suction passage 81...Strainer 82...Suction pipe 83...Oil pump LV...Imaginary straight line

Claims

1. Cylinder and an intake passage that introduces intake air into the cylinder; a crank chamber that accommodates the crankshaft and stores oil; a suction passage for sucking oil stored in the crank chamber; an intake passage that introduces a portion of the intake air flowing through the intake passage into the crank chamber; An internal combustion engine for a vehicle comprising: The introduction passage is a main passage leading from the outside of the crank chamber to the inside of the crank chamber; a plurality of outlet passages for discharging the intake air that has flowed through the main passage, The outlet passage extends from the main passage toward the suction passage when viewed in a direction along the vertical axis of the vehicle. Vehicle internal combustion engine.

2. a supercharger that is located in the intake passage and compresses intake air flowing through the intake passage and supplies the compressed air to a downstream side; The introduction passage is connected to a portion of the intake passage downstream of the supercharger.

2. The internal combustion engine of claim 1.

3. a throttle valve located in a portion of the intake passage downstream of the turbocharger and configured to adjust the amount of intake air flowing through the intake passage, The introduction passage is a portion of the intake passage downstream of the supercharger and is connected to a portion of the intake passage upstream of the throttle valve.

3. The internal combustion engine of claim 2.

4. a discharge passage for discharging gas present in the crank chamber to the intake passage, The exhaust passage is connected to a portion of the intake passage upstream of the supercharger.

4. The internal combustion engine of a vehicle according to claim 2 or 3.

5. The main passage extends in a direction perpendicular to the vertical axis, When viewed from the direction along the vertical axis, an imaginary line connecting the main passage and the suction passage at the shortest distance is defined as an imaginary line, one or more of the plurality of outlet passages is located in one region with respect to the imaginary line when viewed from a direction along the vertical axis, One or more of the plurality of outlet passages is located in the other region with respect to the imaginary line when viewed from the direction along the vertical axis. The internal combustion engine for a vehicle according to any one of claims 1 to 3.

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