JP2016056713A - Internal combustion engine and oil separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal combustion engine which can prevent liquid oil from flowing via a suction port into an oil separator, and thus prevent the consumption of oil from being increased.SOLUTION: An engine 100 (internal combustion engine) includes an engine body 10, and an oil separator 6 mounted on an outer face 10a of the engine body 10 for separating oil included in a blow-by gas BG from the engine body 10. The oil separator 6 includes a suction port 63 communicating with the inside of the engine body 10, and an upper inflow prevention part 67 which is formed to protrude inward with respect to the engine body 10 and prevents liquid oil LO in the engine body 10 from flowing via the suction port 63 into the oil separator 6.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an internal combustion engine and an oil separator.

  Conventionally, an internal combustion engine having a function of separating oil contained in blow-by gas has been known (see, for example, Patent Document 1).

  In Patent Document 1, a frame-shaped bank portion is provided on the side wall, a crankcase integrally formed below the cylinder block, and a frame-shaped bank portion are arranged so as to cover the frame-shaped bank portion from the outside. There is disclosed an engine in which oil (oil mist) contained in blow-by gas is separated in an inner space surrounded by a cylinder block, a crankcase, and a cover member. In the engine described in Patent Document 1, a blow-by gas introduction port is provided in a partition wall between the inner space and the crankcase to communicate the inner space with the crankcase.

JP 2002-106319 A

  However, in the engine described in Patent Document 1, in the crankcase (inside the internal combustion engine body), liquid oil larger than the oil mist is caused to flow in the crankcase near the blow-by gas inlet by turning the crankshaft or the like. It adheres to the inner wall and flows toward the blow-by gas inlet or scatters toward the blow-by gas inlet. For this reason, there is an inconvenience that liquid oil tends to flow into the inner space from the blow-by gas inlet. Therefore, since the amount of oil flowing into the inner space increases and the amount of oil burned with the air-fuel mixture in the blow-by gas also increases, there is a problem that the amount of oil consumption increases. is there.

  This invention was made in order to solve the above problems, and one object of the present invention is to suppress the flow of liquid oil into the oil separator through the suction port, It is an object to provide an internal combustion engine capable of suppressing an increase in oil consumption and an oil separator used in the internal combustion engine.

  In order to achieve the above object, an internal combustion engine according to a first aspect of the present invention is attached to an internal combustion engine body and an outer surface of the internal combustion engine body, for separating oil contained in blow-by gas of the internal combustion engine body. An oil separator, and the oil separator is formed to protrude to the inside of the internal combustion engine body, and the liquid oil in the internal combustion engine body passes through the suction port. And a liquid oil inflow restricting portion that restricts the inflow into the inside of the air.

  In the internal combustion engine according to the first aspect of the present invention, as described above, the liquid oil in the internal combustion engine body flows into the oil separator through the suction port so as to protrude inside the internal combustion engine body. A liquid oil inflow restricting part is provided for restriction. As a result, the liquid oil flowing toward the suction port can be blocked by the liquid oil inflow restricting portion protruding to the inside of the internal combustion engine body, so that the liquid oil is prevented from flowing into the oil separator through the suction port. Can do. Thereby, it can suppress that the consumption of oil increases. Further, by providing a liquid oil inflow restricting portion on the oil separator attached to the outer surface of the internal combustion engine main body so as to protrude inward of the internal combustion engine main body, compared with the case where the liquid oil inflow restricting portion is provided in the internal combustion engine main body. It is not necessary to change the shape of the internal combustion engine body significantly. Thereby, the liquid oil inflow regulation part which regulates inflow of liquid oil can be easily provided in an internal-combustion engine.

  In the internal combustion engine according to the first aspect, preferably, the liquid oil inflow restricting portion is formed integrally with the oil separator by projecting a part of the oil separator to the inside of the internal combustion engine body. If comprised in this way, a number of parts can be reduced compared with the case where a separate liquid oil inflow control part is attached to an oil separator. Also, when the oil separator is made of a material that is lighter than the material constituting the internal combustion engine body, the liquid oil inflow restriction portion is lighter than when the liquid oil inflow restriction portion is provided on the internal combustion engine body side. And the oil separator itself can be reduced in weight.

  In the internal combustion engine according to the first aspect, preferably, the liquid oil inflow restricting portion has an eaves-shaped upper inflow restricting portion that covers the suction port from above. If comprised in this way, it can suppress reliably that liquid oil flows in into the inside of an oil separator from the upper side of a suction inlet by an eaves-shaped upper side inflow control part.

  In this case, preferably, the eaves-shaped upper inflow restricting portion is formed so as to protrude from the vicinity of the upper edge of the suction port to the inside of the internal combustion engine body, and is centerline with respect to the centerline extending in the vertical direction of the suction port. In a direction away from the head and inclined downward. If comprised in this way, liquid oil will flow in the inside of an oil separator from the upper side of an inlet port by forming an upper side inflow control part from the upper edge part vicinity of an inlet port so that it may protrude inside an internal combustion engine main body. Can be effectively suppressed in the vicinity of the upper side of the suction port. Further, the upper inflow restricting portion is in a direction away from the center line with respect to the center line extending in the vertical direction of the suction port and is inclined downward so that it does not overlap the suction port (the front surface of the suction port). The liquid oil can flow (escape) to the position shifted from the position), so that the liquid oil flows into the inlet due to the liquid oil being guided to the position overlapping the inlet (in front of the inlet). Can be suppressed.

  In the internal combustion engine according to the first aspect, preferably, the internal combustion engine main body includes an oil storage portion that is formed in a lower portion of the internal combustion engine main body and stores the liquid oil, and the liquid oil inflow restriction portion includes the oil storage portion. It has a lower inflow restricting portion formed above the oil level of the liquid oil and in the vicinity of the lower end of the suction port. According to this configuration, the liquid oil in the oil reservoir is scattered toward the upper suction port due to the vibration of the main body of the internal combustion engine, or the vehicle in which the internal combustion engine is disposed is inclined, so that the oil reservoir Even when the oil level of the liquid oil reaches the vicinity of the suction port, the lower oil inflow restricting portion can block the liquid oil toward the suction port, so that the liquid oil flows into the oil separator. It can be surely suppressed.

  An oil separator according to a second aspect of the present invention is an oil separator that is attached to an outer surface of an internal combustion engine body and separates oil contained in blow-by gas of the internal combustion engine body, and is in communication with the inside of the internal combustion engine body. And a liquid oil inflow restricting portion that is formed so as to protrude to the inside of the internal combustion engine body and restricts the liquid oil in the internal combustion engine body from flowing into the inside through the suction port.

  In the oil separator according to the second aspect of the present invention, as described above, the liquid oil in the internal combustion engine body flows into the oil separator through the suction port so as to protrude inside the internal combustion engine body. A liquid oil inflow restricting part is provided for restriction. As a result, when the oil separator is attached to the outer surface of the internal combustion engine body, the liquid oil flowing toward the suction port can be blocked by the liquid oil inflow restricting portion protruding inside the internal combustion engine body. Thus, the liquid oil can be restricted from flowing into the oil separator. Thereby, it can suppress that the consumption of oil increases. Further, by providing a liquid oil inflow restricting portion on the oil separator attached to the outer surface of the internal combustion engine main body so as to protrude inward of the internal combustion engine main body, compared with the case where the liquid oil inflow restricting portion is provided in the internal combustion engine main body. It is not necessary to change the shape of the internal combustion engine body significantly. Thereby, a liquid oil inflow control part can be easily provided in an internal-combustion engine.

  In the present application, the following configuration is also conceivable in the internal combustion engine according to the first aspect.

(Additional item 1)
That is, in the configuration in which the liquid oil inflow restricting portion is formed integrally with the oil separator, the oil separator is preferably made of resin.

(Appendix 2)
Further, in the configuration in which the liquid oil inflow restricting portion has a lower inflow restricting portion, the oil separator is preferably formed so as to incline downward from the inside of the oil separator to the inside of the internal combustion engine body through the suction port. And includes an inclined portion constituting the upper surface of the lower inflow restricting portion.

  According to the present invention, as described above, the increase in oil consumption can be suppressed by suppressing the liquid oil from flowing into the oil separator through the suction port.

1 is a perspective view showing a schematic overall configuration of an engine according to a first embodiment of the present invention. It is sectional drawing which showed a part of engine by 1st Embodiment of this invention. It is the side view which showed the outer side surface of the engine main body of the engine by 1st Embodiment of this invention. It is the perspective view which showed the oil separator of the engine by 1st Embodiment of this invention. It is the side view which showed the oil separator of the engine by 1st Embodiment of this invention from the cover part side. It is sectional drawing which showed a part of engine by the 1st modification of 1st Embodiment of this invention. It is the perspective view which showed the oil separator of the engine by the 1st modification of 1st Embodiment of this invention. It is the side view which showed the oil separator of the engine by the 1st modification of 1st Embodiment of this invention from the cover part side. It is sectional drawing which showed a part of engine by 2nd Embodiment of this invention. It is the perspective view which showed the oil separator of the engine by 2nd Embodiment of this invention. It is the side view which showed the oil separator of the engine by 2nd Embodiment of this invention from the cover part side. It is the top view which showed the oil separator of the engine by 2nd Embodiment of this invention from the perpendicular direction upper direction. It is sectional drawing which showed a part of engine by the 2nd modification of 1st Embodiment of this invention.

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

(First embodiment)
First, with reference to FIGS. 1-5, the structure of the engine 100 which consists of a gasoline engine by 1st Embodiment of this invention is demonstrated. In the first embodiment, an example of an in-line four-cylinder engine 100 is shown. In the following description, the direction in which the crankshaft 11 (see FIG. 1) extends is defined as the X direction, and the lateral direction perpendicular to the crankshaft 11 is defined as the Y direction. The engine 100 is an example of the “internal combustion engine” in the present invention.

  As shown in FIG. 1, the automobile engine 100 according to the first embodiment includes an aluminum alloy engine body 10 including a cylinder head 1, a cylinder block 2, and a crankcase 3. The cylinder head 1, the cylinder block 2, and the crankcase 3 are configured as separate bodies. The engine 100 also includes a head cover (cylinder head cover) 4 that is assembled to the upper side in the vertical direction (Z1 side) of the cylinder head 1.

  The engine body 10 includes a crankshaft 11 disposed so as to penetrate the engine body 10 in the X direction. An intake manifold 5 and an oil separator 6 are attached to an outer surface 10a on one side (Y2 side) along the X direction in which the crankshaft 11 extends among the outer surfaces of the engine body 10. The intake manifold 5 and the oil separator 6 are directly connected by a connection passage 7. The engine body 10 is an example of the “internal combustion engine body” in the present invention.

  As shown in FIGS. 2 and 3, the outer surface 2a of the cylinder block 2 and the outer surface 3a of the crankcase 3 are respectively screwed into a screw hole 2b into which a screw 101 is screwed and a plurality (three) of screw holes 3b. Is formed. With this screw 101, as shown in FIG. 1, the oil separator 6 is attached to the outer surface 10a of the engine body 10.

  Intake manifold 5 includes a plurality (four) of distribution pipes 51 connected to a plurality of (four) intake ports 1a of engine body 10 and a surge tank 52 into which the plurality of distribution pipes 51 merge. The intake manifold 5 is a combustion chamber (not shown) formed in the vertical direction (Z1 side) of a plurality (four) of cylinders 21 (see FIG. 2) extending in the vertical direction (Z direction) of the cylinder block 2. The intake device introduces intake air through the intake port 1 a of the cylinder head 1. Further, the intake manifold 5 is configured such that blow-by gas BG is introduced to the lower surface side in the vertical direction of the surge tank 52 via the connection passage 7.

  The oil separator 6 is provided to separate oil mist contained in the blow-by gas BG of the engine body 10. The oil mist is refined engine oil and is dispersed in the blow-by gas BG. The oil separator 6 forms fine oil mist in the blow-by gas BG flowing in from the engine body 10 into droplets, thereby forming a combustion gas that is a gas and an unburned mixture and liquid oil in the form of droplets. It has the function of gas-liquid separation with LO. The oil separator 6 is made of a resin having oil resistance, heat resistance, chemical resistance, and sufficient strength such as 6,6-nylon.

  The connection passage 7 is made of a pipe member and is a connection pipe for reducing blow-by gas BG discharged from a later-described discharge port 64 (PCV valve 66) of the oil separator 6 to the intake manifold 5 on the intake side.

  Next, the structure of the engine body 10 will be described.

  A camshaft, a valve mechanism (not shown), and the like are disposed inside the cylinder head 1 shown in FIG. 1, and an intake port 1a and an exhaust port (not shown) communicating with the cylinder 21 (see FIG. 2). ). The cylinder block 2 has an upper end (Z1 side) in the vertical direction connected to a lower end (Z2 side) in the vertical direction of the cylinder head 1. As shown in FIG. 2, four cylinders 21 in which the piston 22 reciprocates in the Z direction are formed inside the cylinder block 2. The four cylinders 21 are respectively supplied with intake air from four distribution pipes 51 (see FIG. 1) via intake ports 1a (see FIG. 1).

  The crankcase 3 has an upper end in the vertical direction connected to a lower end in the vertical direction of the cylinder block 2. A hollow crank chamber 10 b is formed in the engine body 10 by the cylinder block 2 and the crankcase 3. Further, a crankshaft 11 is disposed in the crank chamber 10b so as to be rotatable about a rotation (center) axis A extending along the X direction (see FIG. 1). The crankshaft 11 is disposed on a mating surface between the cylinder block 2 and the crankcase 3 and is rotatably supported. As a result, the rotational axis A of the crankshaft 11 and the mating surface of the cylinder block 2 and the crankcase 3 substantially coincide with each other in the vertical direction (Z direction). The crankshaft 11 is connected to a piston 22 via a connecting rod (connecting rod) 12, and the crankshaft 11 rotates as the piston 22 moves in the vertical direction in the cylinder 21 as the engine 100 is driven. Driven. At that time, blow-by gas BG leaks into the crank chamber 10b from a combustion chamber (not shown) above the piston 22 in the vertical direction (Z1 side) through a minute gap between the piston 22 and the cylinder 21.

  An opening 31 to which a later-described suction port 63 of the oil separator 6 is connected is provided on the side of the crankcase 3 on the Y2 side. The opening 31 penetrates the Y2 side of the crankcase 3 in the Y direction so as to connect the crank chamber 10b inside the crankcase 3 and the outside (oil separator 6). The opening 31 has an oval shape that is long in the vertical direction (Z direction).

  An oil reservoir 32 in which the liquid oil LO is stored is provided at the lower portion (Z2 side) in the vertical direction of the crank chamber 10b. The liquid oil LO is pumped from the oil reservoir 32 to the upper part in the vertical direction in the engine main body 10 by an oil pump (not shown), and a valve timing system member (not shown) such as a camshaft, the outer peripheral surface of the piston 22 and the like. After the sliding portion is lubricated, it falls by its own weight, and most of it is returned to the oil storage portion 32. Here, a part of the liquid oil LO is refined to form a mist (mist) and is contained in the blow-by gas BG as an oil mist. This oil mist is gas-liquid separated in the oil separator 6.

  Further, the upper end in the vertical direction of the crankcase 3 (the mating surface between the cylinder block 2 and the crankcase 3) is vertically above (Z1 side) the oil level G of the liquid oil LO stored in the oil storage portion 32. The crankcase 3 is configured to be positioned. In the present specification, the oil level G of the liquid oil LO means an oil level in a state where an allowable amount (upper limit amount) of the liquid oil LO is stored in the oil storage unit 32. The oil reservoir 32 may be formed integrally with the crankcase 3 or may be formed as a separate body (separate member) from the crankcase 3.

  Here, in the engine main body 10 (crank chamber 10b), the liquid oil LO adhering to the crankshaft 11 is scattered by the turning of the crankshaft 11, and the inner surface of the engine main body 10 above the opening 31 in the vertical direction. It adheres to 10c and flows toward the opening 31 (suction port 63 of the oil separator 6) or scatters toward the opening 31.

  Therefore, in the first embodiment, the oil separator 6 is provided with an upper inflow restricting portion 67 that restricts the liquid oil LO in the engine body 10 from flowing into the oil separator 6 through the suction port 63. The upper inflow restricting portion 67 will be described later. The upper inflow restricting portion 67 is an example of the “liquid oil inflow restricting portion” in the present invention.

  Next, the structure of the oil separator 6 will be described in detail. The direction in each structure of the oil separator 6 is defined by the direction when attached to the outer side surface 10a of the engine body 10.

  As shown in FIG. 1, the oil separator 6 is attached to a lower side in the vertical direction (Z2 side) than the intake manifold 5 on the outer side surface 10a on the Y2 side of the engine body 10. At this time, the oil separator 6 is fixed to the outer surface 10 a of the engine body 10 in a state where the position of the suction port 63 coincides with the position of the opening 31. 4 and 5, the oil separator 6 is formed with a plurality (four) of screw insertion holes 6a into which the screws 101 are inserted.

  The oil separator 6 is disposed on the side of the crankcase 3 (see FIG. 2) (Y1 side) and on the side opposite to the crankcase 3 (Y2 side), and the lid 61 is attached from the Y1 side. And a main body 62. The oil separator 6 is created by being integrated by vibration welding or the like with the main body 62 attached to the lid 61.

  Further, as shown in FIG. 2, the oil separator 6 is disposed so as to face the opening 31 of the crankcase 3 of the engine body 10, thereby connecting the suction port 63 communicating with the inside of the engine body 10 and the connection passage 7. And a discharge port 64 communicating with the inside of the intake manifold 5. The suction port 63 is formed in the lid portion 61, and the discharge port 64 is formed in the main body portion 62.

  Here, the opening 31 of the crankcase 3 and the suction port 63 of the oil separator 6 are both vertically downward (Z2 side) below the rotation axis A (crank center) of the crankshaft 11 in the vertical direction (Z direction). And it arrange | positions so that it may be located in the perpendicular direction upper direction (Z1 side) rather than the oil level G of liquid oil LO stored in the oil storage part 32. That is, neither the opening 31 of the crankcase 3 nor the suction port 63 of the oil separator 6 is arranged in the cylinder head 1 or the cylinder block 2 that is vertically above the rotational axis A of the crankshaft 11.

  In addition, an inclined portion 62a is formed on the lower surface of the main body portion 62 in the vertical direction and is inclined in the direction toward the suction port 63 (Y1 direction) and downward in the vertical direction (Z2 direction).

  In addition, the oil separator 6 includes a labyrinth structure separation portion including a bent flow path 65 that connects the suction port 63 and the discharge port 64 by integrating the lid portion 61 and the main body portion 62. . The suction port 63 is disposed at the lower end portion of the flow path 65, and the discharge port 64 is disposed on the Y2 side near the upper end portion of the flow path 65.

  In the oil separator 6, the fine oil mist in the blow-by gas BG is turned into droplet-like liquid oil LO when the blow-by gas BG collides with the inner wall in the separation part of the labyrinth structure. The liquid oil LO in the form of droplets flows through the flow path 65 of the oil separator 6 in the direction opposite to the flow direction of the blow-by gas BG due to the weight of the oil, and the lower part of the suction port 63 and the opening 31 in the vertical direction. To the oil reservoir 32 of the crank chamber 10b. Here, by using the suction port 63 and the oil discharge port in common, the pressure difference is not generated between the suction port 63 and the discharge port. As a result, it is possible to suppress an adverse effect on the suction efficiency of the blow-by gas BG due to the occurrence of a pressure difference between the suction port 63 and the discharge port.

  As shown in FIG. 2, a PCV (Positive Crankcase Ventilation) valve 66 that directly circulates the blow-by gas BG in the discharge direction is directly attached to the discharge port 64 of the oil separator 6. A connection passage 7 is connected to the discharge side of the PCV valve 66.

  The PCV valve 66 is configured to change the opening according to the pressure difference between the intake manifold 5 side and the oil separator 6 side. The PCV valve 66 opens when the intake manifold 5 side becomes low pressure, and the intake manifold 5 side becomes high pressure. Close the valve in case. The PCV valve 66 has a function of adjusting the flow rate of the blow-by gas BG.

  With such a configuration, as shown in FIG. 2, the blow-by gas BG is sucked into the suction port 63 of the oil separator 6 by the negative pressure of the intake manifold 5 (see FIG. 1). The blow-by gas BG sucked into the suction port 63 is reduced into the surge tank 52 (see FIG. 1) of the intake manifold 5 through the oil separator 6, the PCV valve 66 and the connection passage 7. The blow-by gas BG reduced into the surge tank 52 is supplied together with intake air to each intake port 1a (see FIG. 1) via each distribution pipe 51. Such a PCV system is provided in the engine 100.

  The lid 61 of the oil separator 6 has a circumferential groove 61a in which the O-ring 102 is disposed. The circumferential groove 61 a is formed so as to surround the periphery of the suction port 63. O-ring 102 is provided to prevent oil from flowing out of engine 100.

  Here, the structure of the suction port 63 and the upper inflow restricting portion 67 of the oil separator 6 will be described in detail.

  As shown in FIGS. 4 and 5, the suction port 63 is formed so as to penetrate the lid portion 61 of the oil separator 6 in the Y direction. Further, the portions other than the upper edge portion 63 b constituting the upper portion in the vertical direction (Z direction) of the suction port 63 constitute a part of an oval shape that is long in the vertical direction so as to correspond to the opening 31. On the other hand, when viewed from the Y1 side, the upper edge portion 63b is formed not to be a semicircle forming a part of an oval shape, but to be a mountain shape in which line segments intersect at the upper end 63a in the vertical direction. Such a shape of the suction port 63 is formed by positioning a base portion 61b for forming the upper inflow restricting portion 67 in the upper part of the elliptical vertical direction.

  The suction port 63 is formed so as to be substantially mirror image symmetric with respect to a center line C extending in the vertical direction (vertical direction, Z direction) of the suction port 63. Further, as shown in FIG. 2, the upper edge 63 b of the suction port 63 is formed slightly inside the inner surface of the opening 31.

  As shown in FIGS. 4 and 5, the upper inflow restricting portion 67 is integrally formed with the oil separator 6 by projecting from the base portion 61 b in the vicinity of the upper edge portion 63 b in the vertical direction of the suction port 63 to the Y1 side. ing. Further, the upper inflow restricting portion 67 is formed in a mountain shape as viewed from the Y1 side so as to follow the upper edge portion 63b of the suction port 63, and has an eaves shape (umbrella shape) that covers the entire suction port 63 from the upper side in the vertical direction. )have.

  Further, as shown in FIG. 2, when the oil separator 6 is attached to the outer surface 10 a of the engine body 10, the upper edge 63 b of the suction port 63 is positioned slightly inside the inner surface of the opening 31. By being formed, the upper inflow restricting portion 67 is formed so as to be able to protrude through the opening 31 to the crank chamber 10b inside (inside) the engine body 10. The upper inflow restricting portion 67 protrudes from the inner side surface 10c of the crank chamber 10b to the Y1 side by a length L1.

  As shown in FIG. 5, the upper inflow restricting portion 67 is formed so as to be substantially mirror-image symmetric with respect to the center line C, similarly to the suction port 63. The upper inflow restricting portion 67 is inclined in the X1 direction away from the center line C and downward in the vertical direction (Z2 direction) in the inclined portion 67b from the top portion 67a on the center line C toward the X1 side. In the inclined portion 67c from the top 67a on the center line C toward the X2 side, the inclined portion 67c is inclined in the X2 direction away from the center line C and downward in the vertical direction. On the other hand, the inclined portions 67b and 67c of the umbrella-shaped upper inflow restricting portion 67 are formed so as to extend substantially horizontally without being inclined downward in the vertical direction in the Y direction.

  Further, wall portions 67d extending slightly downward in the vertical direction are formed at the lower ends in the vertical direction of the inclined portions 67b and 67c of the umbrella-shaped upper inflow restricting portion 67, respectively. The wall portion 67d is formed so as to extend along straight portions formed on both sides of the suction port 63 in the X direction.

  Thereby, the liquid oil LO that has dropped on the upper surface in the vertical direction of the inclined portion 67b or 67c of the upper inflow restricting portion 67 is separated from the center line C along the inclination of the inclined portion 67b or 67c (X1 direction or X2). Direction) and vertically downward. Then, the liquid oil LO falls from the wall portion 67d of the upper inflow restricting portion 67 to the outside of the suction port 63 in the X direction. On the other hand, since the inclined portions 67b and 67c of the upper inflow restricting portion 67 are formed so as to extend substantially horizontally without being inclined downward in the vertical direction in the Y direction, from the end of the upper inflow restricting portion 67 on the Y1 side. The liquid oil LO is suppressed from falling on the front surface (position overlapping in the Y direction) of the suction port 63 (opening 31). As a result, the liquid oil LO falling to the front of the suction port 63 is suppressed from being sucked into the oil separator 6 due to negative pressure.

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

  In the first embodiment, as described above, the liquid oil LO in the engine body 10 flows into the oil separator 6 through the suction port 63 so as to protrude into the crank chamber 10b inside the engine body 10. An upper inflow restricting portion 67 is provided for restricting. As a result, the liquid oil LO heading toward the suction port 63 can be blocked by the upper inflow restricting portion 67 protruding inward of the engine body 10, so that the liquid oil flows into the oil separator 6 through the suction port 63. Can be regulated. Thereby, it is possible to suppress an increase in oil consumption (amount taken away). Further, the upper inflow restricting portion 67 is provided on the oil separator 6 attached to the outer side surface 10 a of the engine main body 10 so as to protrude into the crank chamber 10 b inside the engine main body 10. Compared with the case where it provides in, it is not necessary to change the shape of the engine main body 10 significantly. Thus, the upper inflow restricting portion 67 that restricts the inflow of the liquid oil LO can be easily provided in the engine 100.

  In the first embodiment, the upper inflow restricting portion 67 is formed integrally with the oil separator 6 by projecting from the base portion 61 b in the vicinity of the upper edge portion 63 b in the vertical direction of the suction port 63 to the Y1 side. Thereby, compared with the case where the separate upper inflow control part 67 is attached to the oil separator 6, the number of parts can be reduced. Further, the oil separator 6 is made of a resin that is lighter than the aluminum alloy that constitutes the engine body 10, thereby reducing the weight of the upper inflow restricting portion 67 compared to the case where the upper inflow restricting portion 67 is provided on the engine body 10 side. In addition, the oil separator 6 itself can be reduced in weight.

  In the first embodiment, the upper inflow restricting portion 67 protrudes from the base 61b near the upper edge 63b in the vertical direction of the suction port 63 to the Y1 side, and the suction port extends along the upper edge 63b of the suction port 63. It forms in the eaves shape which covers the whole 63 from the perpendicular direction upper side. Thereby, the eaves-shaped upper inflow restricting portion 67 can surely suppress the liquid oil LO from flowing into the oil separator 6 from the upper side in the vertical direction of the suction port 63.

  In the first embodiment, by forming the eaves-shaped upper inflow restricting portion 67 so as to protrude from the vicinity of the upper edge 63a in the vertical direction of the suction port 63 to the inside of the engine body 10, the liquid oil LO is sucked into the suction port. Inflow into the oil separator 6 from the upper side of 63 in the vertical direction can be effectively suppressed in the vicinity of the upper side of the suction port 63 in the vertical direction. Further, the inclined portion 67b on the X1 side of the upper inflow restricting portion 67 is in the X1 direction away from the center line C with respect to the center line C extending in the vertical direction (Z direction) of the suction port 63, and vertically downward ( (Z2 direction) and an inclined portion 67c on the X2 side of the upper inflow restricting portion 67 is formed so as to incline in the X2 direction away from the center line C and downward in the vertical direction. Accordingly, the liquid oil LO can flow (escape) to a position that does not overlap with the suction port 63 (a position shifted from the front of the opening 31 and the suction port 63 on the Y1 side), and therefore a position that overlaps with the suction port 63 (suction) It is possible to suppress the liquid oil LO from flowing into the suction port 63 due to the liquid oil LO being guided to the front of the port 63.

(First modification of the first embodiment)
Next, a modification of the first embodiment will be described with reference to FIGS. In the modified example of the first embodiment, an example in which the upper inflow restricting portion 267 is formed in a semicircular shape unlike the upper inflow restricting portion 67 formed in a mountain shape will be described. In addition, in the 1st modification of 1st Embodiment, about the structure similar to the said 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted. The upper inflow restricting portion 267 is an example of the “liquid oil inflow restricting portion” in the present invention.

  In the first modification of the first embodiment, as shown in FIG. 6, the oil separator 206 of the engine 200 is attached to the outer surface 10 a on the Y2 side of the engine body 10. Further, the structure of the oil separator 206 itself is defined by the direction when the oil separator 206 is attached to the outer side surface 10a of the engine body 10. The engine 200 is an example of the “internal combustion engine” in the present invention.

  As shown in FIGS. 7 and 8, the suction port 263 of the oil separator 206 is different from the suction port 63 (see FIGS. 4 and 5) of the first embodiment, and the base 61b is not provided. The oval shape is long in the vertical direction (Z direction) so as to correspond to the opening 31. That is, the upper edge portion 263b constituting the upper portion of the suction port 263 in the vertical direction is formed in a semicircular shape constituting a part of an oval shape. On the other hand, as shown in FIG. 6, the suction port 263 is configured so that the upper end edge portion 263 b including the upper end 263 a in the vertical direction of the suction port 263 is located slightly lower (Z2 side) in the vertical direction than the inner surface of the opening 31. It is formed in an oval shape slightly smaller than the opening 31. Note that the suction port 263 is formed to be substantially mirror-image symmetric with respect to the center line C extending in the vertical direction of the suction port 263.

  As shown in FIGS. 7 and 8, the oil separator 206 has an upper side that restricts the liquid oil LO in the engine body 10 from flowing into the flow path 65 inside the oil separator 206 through the suction port 263. An inflow restricting portion 267 is provided. The upper inflow restricting portion 267 is formed integrally with the lid portion 261 of the oil separator 206 by protruding from the lid portion 261 near the upper edge portion 263b to the Y1 side between the groove portion 61a and the suction port 263. Has been. The upper inflow restricting portion 267 is formed in a semicircular shape when viewed from the Y1 side along the semicircular upper edge portion 263b of the suction port 263, and the entire suction port 263 is vertically upward (Z1 It has an eaves shape that covers from the side.

  Further, as shown in FIG. 6, when the oil separator 206 is attached to the outer side surface 10 a of the engine body 10, the upper end edge portion 263 b of the suction port 263 is slightly lower than the inner surface of the opening portion 31 (Z2 side). ) So that the upper inflow restricting portion 267 can pass through the opening 31 and protrude to the crank chamber 10b inside (inside) the engine body 10. Has been. The upper inflow restricting portion 267 protrudes from the inner side surface 10c of the crank chamber 10b to the Y1 side by a length L2.

  As shown in FIG. 8, the upper inflow restricting portion 267 is formed so as to be substantially mirror-image symmetric with respect to the center line C, similarly to the suction port 263. Then, the upper inflow restricting portion 267 is inclined in the X1 direction away from the center line C and vertically downward (Z2 direction) in the arc-shaped portion 267b from the top portion 267a on the center line C toward the X1 side. In the arc-shaped portion 267c which is formed on the center line C from the top portion 267a toward the X2 side, the circle is inclined in the X2 direction away from the center line C and downward in the vertical direction. It is formed in an arc shape. Further, the arc-shaped portions 267b and 267c of the upper inflow restricting portion 267 are formed to extend substantially horizontally without being inclined downward in the vertical direction in the Y direction.

  As a result, the liquid oil LO that has fallen on the upper surface in the vertical direction of the arc-shaped portion 267b or 267c of the upper inflow restricting portion 267 is separated from the center line C along the arc-shaped portion 267b or 267c (X1 direction or X2). Direction) and vertically downward. Then, the liquid oil LO falls from the upper inflow restricting portion 267 to the outside of the suction port 263 in the X direction. On the other hand, the arc-shaped portions 267b and 267c of the upper inflow restricting portion 267 are formed so as to extend substantially horizontally without being inclined downward in the vertical direction in the Y direction, so that the end portion on the Y1 side of the upper inflow restricting portion 267 The liquid oil LO is suppressed from falling to the front surface (position overlapping in the Y direction) of the suction port 263 (opening 31). As a result, the liquid oil LO falling to the front of the suction port 263 is suppressed from being sucked into the oil separator 206 due to negative pressure.

  Other configurations of the first modified example of the first embodiment are the same as those of the first embodiment.

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

  In the first modification of the first embodiment, the liquid oil LO in the engine body 10 flows into the oil separator 206 through the suction port 263 so as to protrude into the crank chamber 10 b inside the engine body 10. An upper inflow restricting portion 267 is provided for restricting. Thereby, similarly to the said 1st Embodiment, it can suppress that the amount of oil consumption increases by the upper inflow control part 267. FIG. Further, by providing an upper inflow restricting portion 267 so as to protrude into the crank chamber 10b inside the engine body 10 on the oil separator 206 attached to the outer side surface 10a of the engine body 10, as in the first embodiment, The engine 200 can be easily provided with the upper inflow restricting portion 267 that restricts the inflow of the liquid oil LO.

  In the first modification of the first embodiment, the upper inflow restricting portion 267 is formed along the semicircular vertical upper edge 263b of the suction port 263. As a result, the upper inflow restricting portion 267 can be formed so as to correspond to the opening 31, so that the gap between the opening 31 and the upper inflow restricting portion 267 can be reduced. This suppresses a reduction in the amount of oil used to lubricate the sliding portion of the engine body 10 due to the liquid oil LO remaining in the gap between the opening 31 and the upper inflow restricting portion 267. be able to.

  Other effects of the first modification of the first embodiment are the same as those of the first embodiment.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. In the second embodiment, an example in which the lower inflow restricting portion 368 is provided will be described, unlike the first embodiment in which the upper inflow restricting portion 67 is provided. Note that in the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. The lower inflow restricting portion 368 is an example of the “liquid oil inflow restricting portion” in the present invention.

  In the second embodiment, as shown in FIG. 9, the oil separator 306 of the engine 300 is attached to the outer surface 10 a on the Y2 side of the engine body 10. Further, the structure of the oil separator 306 itself is defined by the direction when the oil separator 306 is attached to the outer side surface 10a of the engine body 10. Engine 300 is an example of the “internal combustion engine” in the present invention.

  An oblong opening 361 c that is long in the vertical direction (Z direction) is formed in the lid 361 of the oil separator 306 so as to correspond to the opening 31 of the engine body 10. Note that the opening 31 of the engine body 10 and the opening 361c of the lid 361 are formed to have substantially the same size.

  In the second embodiment, the oil separator 306 has a lower inflow restricting portion that restricts the liquid oil LO in the engine body 10 from flowing into the flow path 65 inside the oil separator 306 via the suction port 363. 368 is provided. The lower inflow restricting portion 368 is formed vertically above the oil level G of the liquid oil LO of the oil reservoir 32 (on the Z1 side), and the lower portion of the main body 362 of the oil separator 306 in the vertical direction. It is integrally formed.

  As shown in FIGS. 9 to 11, the upper surface 368 a in the vertical direction of the lower inflow restricting portion 368 communicates with the inclined portion 362 a of the main body portion 362 of the oil separator 306, and the engine main body 10 side. In the Y1 direction and in the vertical direction downward (Z2 direction). That is, the inclined portion 362a of the oil separator 306 is inclined downward in the vertical direction so as to pass through the suction port 363 from the inside of the oil separator 306 and protrude in the Y1 direction, and the upper surface 368a of the lower inflow restricting portion 368 is formed. Also serves as.

  In the second embodiment, the upper portion and the central portion of the suction port 363 in the vertical direction are configured by the opening portion 361c of the lid portion 361, and the lower portion of the suction port 363 in the vertical direction is the lower inflow restricting portion 368. It is comprised by the upper surface 368a (inclination part 362a). That is, the lower inflow restricting portion 368 is formed at the lower end in the vertical direction of the suction port 363 and in the vicinity thereof.

  Further, the end 368c on the engine body 10 side (Y1 side) of the lower inflow restricting portion 368 is vertically above the lower end in the vertical direction of the opening 361c of the lid 361 and the lower end in the vertical direction of the opening 31. Configured to be located. As a result, the lower inflow restricting portion 368 is formed so as to be able to pass through the opening 31 and protrude to the crank chamber 10 b inside (inside) the engine body 10. Note that the lower inflow restricting portion 368 protrudes from the inner side surface 10c of the crank chamber 10b by a length L3 toward the Y1 side.

  As shown in FIG. 9, the lower surface 368b in the vertical direction of the lower inflow restricting portion 368 is formed substantially horizontally. Then, the liquid oil LO from the oil storage portion 32 in the lower vertical direction collides with the lower surface 368b of the lower inflow restricting portion 368 so that the liquid oil LO is returned to the oil storage portion 32 again without being sucked from the suction port 363. It is configured.

  Further, as shown in FIG. 12, the lower inflow restricting portion 368 protrudes in the Y1 direction in a trapezoidal shape when viewed from above in the vertical direction (Z1 side). That is, the Y1 side end portion 368c of the lower inflow restricting portion 368 is formed to extend by a predetermined length in the X direction. Further, the vertical upper surface 368a (inclined portion 362a) of the lower inflow restricting portion 368 is inclined in the Y1 direction and vertically downward (Z2 direction), but not in the X direction. Has been.

  As shown in FIG. 11, the suction port 363 and the lower inflow restricting portion 368 are formed so as to be substantially mirror-image symmetric with respect to the center line C.

  Other configurations of the second embodiment are the same as those of the first embodiment.

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

  In the second embodiment, the lower side that restricts the liquid oil LO in the engine body 10 from flowing into the oil separator 306 through the suction port 363 so as to protrude into the crank chamber 10 b inside the engine body 10. An inflow restricting portion 368 is provided. Thereby, similarly to the said 1st Embodiment, it can suppress that the amount of oil consumption increases by the lower inflow control part 368. FIG. Further, the oil separator 306 attached to the outer side surface 10a of the engine body 10 is provided with a lower inflow restricting portion 368 so as to protrude into the crank chamber 10b inside the engine body 10, so that the same as in the first embodiment. The engine 300 can be easily provided with the lower inflow restricting portion 368 that restricts the inflow of the liquid oil LO.

  In the second embodiment, the lower inflow restricting portion 368 is formed in the vertical direction above the oil level G of the liquid oil LO of the oil storing portion 32 and in the vicinity of the lower end of the suction port 363 in the vertical direction. As a result, the liquid oil LO in the oil reservoir 32 is scattered toward the suction port 363 in the vertical direction due to the vibration of the engine main body 10, or the vehicle in which the engine 300 is disposed is inclined to cause the oil reservoir. Even when the oil level G of the 32 liquid oil LO reaches the vicinity of the suction port 363, the lower inflow restricting portion 368 reliably suppresses the liquid oil LO from flowing into the oil separator 306. be able to.

  In the second embodiment, the main body portion 362 of the oil separator 306 is inclined downward in the vertical direction from the inside of the oil separator 306 through the suction port 363 to the crank chamber 10b inside the engine main body 10, and has a lower inflow restriction. An inclined portion 362a constituting the upper surface 368a in the vertical direction of the portion 368 is formed. Thus, the oil mist (liquid oil LO) liquefied in the oil separator 306 is reliably transferred to the oil reservoir 32 via the inclined portion 362a that is inclined downward in the vertical direction to the crank chamber 10b inside the engine body 10. Can be returned.

  Other effects of the second embodiment are the same as those of the 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 embodiment but by the scope of claims for patent, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first embodiment and the modification of the first embodiment, the oil separator 6 (206) is provided with the upper inflow restricting portion 67 (267, liquid oil inflow restricting portion), and in the second embodiment, the oil separator Although the example which provided the lower inflow control part 368 (liquid oil inflow control part) in 306 was shown, this invention is not limited to this. In the present invention, for example, as in the second modification of the first embodiment shown in FIG. 13, the oil separator 406 is provided with an upper inflow restricting portion 67 and a lower inflow restricting portion that protrude into the crank chamber 10 b inside the engine body 10. Both parts 368 may be provided. Moreover, you may provide a wall-like liquid oil inflow control part in the both sides of a suction inlet so that an upper inflow control part and a lower inflow control part may be connected. That is, you may provide the liquid oil inflow control part which protrudes in the crank chamber inside an engine main body over the perimeter of an inlet port.

  Moreover, in the said 1st Embodiment and the modification of 1st Embodiment, the upper inflow control part 67 (267, liquid oil inflow control part) is integrally provided in the oil separator 6 (206), and in the said 2nd Embodiment, it is. Although an example in which the lower inflow restricting portion 368 (liquid oil inflow restricting portion) is integrally provided in the oil separator 306 has been shown, the present invention is not limited to this. In the present invention, the liquid oil inflow restricting portion may be provided separately from the oil separator. That is, the liquid separator may be provided in the oil separator by screwing a liquid oil inflow restricting portion separate from the oil separator.

  Further, in the first embodiment and the modified example of the first embodiment, the upper inflow restricting portion 67 (267) is set in the vertical direction (Z direction) in the Y direction (through direction of the opening 31 and the suction port 63 (263)). The example formed so as not to incline is shown in (), but the present invention is not limited to this. In the present invention, the upper inflow restricting portion may be formed so as to be inclined in the vertical direction in the direction of penetration of the opening and the suction port. At this time, if the upper inflow restricting portion is formed on the side opposite to the engine main body (Y2 side in FIG. 2) and inclined downward in the vertical direction, the upper inflow restricting portion is liquid at the end on the engine main body side. Since the oil can be prevented from being guided, it is possible to suppress the liquid oil from falling on the front surface of the suction port (opening).

  Further, in the first embodiment and the modified example of the first embodiment, the upper inflow restricting portion 67 (267) is arranged with respect to the center line C extending in the vertical direction (vertical direction, Z direction) of the suction port 63 (263). Inclined portions 67b and 67c (arc-shaped portions 267b and 267c) are formed so as to be inclined in the direction away from the center line C and vertically downward (Z2 direction). However, the present invention is not limited to this. In the present invention, it is not necessary to form the mirror image symmetrically with respect to the center line extending in the vertical direction of the suction port. For example, by forming the upper inflow restricting portion so as to incline downward in the vertical direction from one end side in the direction orthogonal to the center line of the suction port (the X direction in FIG. 5) toward the other end side, You may form an upper side inflow control part in the eaves shape which covers a suction inlet from a perpendicular direction upper side.

  Moreover, in the modification of the said 1st Embodiment and 1st Embodiment, the upper inflow restriction part 67 (267) showed the example formed in the eaves shape which covers the whole suction inlet 63 (263) from a perpendicular direction upper side. However, the present invention is not limited to this. In the present invention, the upper inflow restricting portion may be formed so as to cover only a part of the suction port from the upper side in the vertical direction.

  Moreover, in the said 1st Embodiment and the modification of 1st Embodiment, the example which formed the upper inflow control part 67 (267, liquid oil inflow control part) in the perpendicular direction upper side of the suction inlet 63 (263) is shown, In 2nd Embodiment, although the lower inflow control part 368 (liquid oil inflow control part) was provided in the perpendicular direction lower side of the suction inlet 363, the present invention is not limited to this. In the present invention, the liquid oil inflow restricting portion may be formed only on the side of the suction port.

  In the first and second embodiments, an example in which the oil separator 6 (206, 306, 406) is attached to the outer side surface 10a on the Y2 side of the engine body 10 (the cylinder block 2 and the crankcase 3) is shown. However, the present invention is not limited to this. In the present invention, the oil separator may be attached to the outer surface of the crankcase of the engine body, but not attached to the outer surface of the cylinder block.

  In the first and second embodiments, an example in which the engine body 10 includes the cylinder head 1, the cylinder block 2, and the crankcase 3 has been described. However, the present invention is not limited to this. The engine body may include members other than the cylinder head, the cylinder block, and the crankcase. For example, the engine body may include a ladder frame that supports the crankshaft and an oil pan having an oil reservoir.

  Moreover, in the said 1st and 2nd embodiment, although the cylinder block 2 and the crankcase 3 showed the example comprised as a different body, this invention is not limited to this. In the present invention, the cylinder block and the crankcase may be configured integrally.

  In the first and second embodiments, an example of the oil separator 6 (206, 306, 406) (so-called inertial collision type oil separator) having a separation portion including the flow path 65 having a labyrinth structure is shown. The present invention is not limited to this. In the present invention, the oil separator is a centrifugal oil separator that creates a swirling flow of blow-by gas in the oil separator and performs gas-liquid separation by centrifugal force, or a filter that performs gas-liquid separation by a filter that allows blow-by gas to pass through. It may be a mold oil separator. Moreover, the oil separator may be comprised by the combination of these several types of separation parts.

6, 206, 306, 406 Oil separator 10 Engine body (internal combustion engine body)
10a outer surface 32 oil reservoir 63 suction port 67, 267 upper inflow restricting portion (liquid oil inflow restricting portion)
100, 200, 300 engine (internal combustion engine)
368 Lower inflow restriction part (liquid oil inflow restriction part)
BG Blow-by gas C Center line G Oil level LO Liquid oil

Claims (6)

An internal combustion engine body;
An oil separator attached to an outer surface of the internal combustion engine body, for separating oil contained in blow-by gas of the internal combustion engine body;
The oil separator is formed so as to protrude to the inside of the internal combustion engine body, and a suction port communicating with the inside of the internal combustion engine body, and the liquid oil in the internal combustion engine body passes through the suction port. An internal combustion engine including a liquid oil inflow restricting portion that restricts the inflow into the inside of the engine.   2. The internal combustion engine according to claim 1, wherein the liquid oil inflow restricting portion is formed integrally with the oil separator by projecting a part of the oil separator to the inside of the internal combustion engine main body.   3. The internal combustion engine according to claim 1, wherein the liquid oil inflow restricting portion has an eaves-shaped upper inflow restricting portion that covers the suction port from above.   The eaves-shaped upper inflow restricting portion is formed so as to protrude from the vicinity of the upper edge of the suction port to the inside of the internal combustion engine body, and extends from the center line with respect to a center line extending in the vertical direction of the suction port. The internal combustion engine according to claim 3, wherein the internal combustion engine is inclined in a direction away from and downward. The internal combustion engine body includes an oil storage portion that is formed at a lower portion of the internal combustion engine body and stores the liquid oil.
The liquid oil inflow restricting portion has a lower inflow restricting portion formed above the oil level of the liquid oil in the oil reservoir and near the lower end of the suction port. The internal combustion engine according to any one of the above. An oil separator attached to an outer surface of an internal combustion engine body for separating oil contained in blow-by gas of the internal combustion engine body,
A suction port communicating with the inside of the internal combustion engine body;
An oil separator, comprising: a liquid oil inflow restricting portion that is formed so as to protrude to the inside of the internal combustion engine main body and restricts the liquid oil in the internal combustion engine main body from flowing into the inside through the suction port.

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