JP5958271B2 - Oil discharge structure - Google Patents

Description

  The present invention relates to an oil discharge structure. More specifically, the present invention relates to an oil discharge structure of an oil mist separator that is easy to handle and can prevent backflow of blow-by gas with a simple configuration.

  2. Description of the Related Art Conventionally, there has been known a PCV (positive crankcase ventilation) system that introduces blow-by gas leaking into a crankcase from a combustion chamber of an internal combustion engine through a gap between a piston and a cylinder into an intake system. In this PCV system, blow-by gas, which is incomplete combustion gas, is sent again into the combustion chamber, thereby preventing the release of fuel components and carbon monoxide contained in the blow-by gas into the atmosphere.

  However, the blow-by gas contains an oil component for lubricating the internal combustion engine in a mist form. When the blow-by gas containing this oil component is burned, the amount of lubricating oil decreases, Problems such as generation of white smoke due to the combustion of components occur. For this reason, it is known that an oil mist separator is provided in the PCV system to separate mist-like oil contained in blow-by gas (see, for example, Patent Document 1).

JP 2004-204811 A

  In Patent Document 1, a drain pipe having a predetermined length is suspended from a bottom lid that forms an oil separation chamber (gas flow passage). At the lower end of the drain pipe, a drain hole narrowed to the diameter at which the oil film is formed is provided. Oil is collected inside the drain pipe. By increasing the length of the drain pipe to some extent, the height (length) of the oil accumulated in the drain pipe is secured and the backflow of blow-by gas from the drain hole is prevented.

As described above, in the conventional oil mist separator, the length of the drain pipe is secured to prevent the blow-by gas from being ejected from the drain hole, and the separated oil is prevented from flowing out together with the blow-by gas. ing. Thus, the drain pipe of the oil mist separator needs to have a structure that extends downward from the bottom wall of the gas flow passage.
However, in this case, the arrangement position of the drain pipe may be restricted due to the position of the parts located below the oil mist separator. In addition, since the drain pipe has a structure that protrudes long downward, the drain pipe sometimes becomes an obstacle when the oil mist separator as a part is transported or stored. Further, when the oil mist separator is assembled, the drain pipe may interfere with or collide with other parts.

  The present invention has been made in view of the above situation, and an object thereof is to provide an oil discharge structure of an oil mist separator that is easy to handle and can prevent backflow of blow-by gas with a simple configuration. .

In order to solve the above-mentioned problems, the invention according to claim 1 is provided in a cylinder head cover of an internal combustion engine, and circulates a blow-by gas leaking into a crankcase, whereby a mist-like shape contained in the blow-by gas is provided. An oil discharge structure of an oil mist separator that separates oil,
The oil mist separator is
A separator body formed with a gas flow passage through which the blow-by gas flows;
A gas introduction part for introducing the blow-by gas into the separator body;
A gas discharge part for discharging the blow-by gas from the separator body;
A separating means provided in the separator body for separating the oil from the blow-by gas;
An oil discharge part that has a drain hole formed in the bottom wall of the separator body and discharges the oil separated by the separation means from the separator body;
A component hole of the internal combustion engine located below the drain hole is formed with a communication hole that is continuous with the drain hole.
The component of the internal combustion engine is a cam cap that holds the pair of camshafts across a pair of camshafts arranged side by side,
On the upper surface between the pair of cam shafts of the cam cap, a protruding portion is formed that protrudes toward the bottom wall of the separator body and is formed with the communication hole.
The gist is that the separated oil is discharged through the drain hole and the communication hole.

The gist of the invention described in claim 2 is that, in claim 1, the drain hole and the communication hole communicate with each other via a gasket.
A third aspect of the present invention is summarized in that, in the first or second aspect, a lower end of the communication hole is opened to a space in the cylinder head cover.

  According to the oil discharge structure of the present invention, the oil mist separator includes a separator body in which a gas flow passage through which blow-by gas flows is formed, a gas introduction unit that introduces blow-by gas into the separator body, and exhausts blow-by gas from the separator body. Gas separator, a separator provided in the separator body, for separating oil from blow-by gas, and a drain hole formed in the bottom wall of the separator body, and the oil separated by the separator is separated from the separator body. And an oil discharger for discharging. In addition, a communication hole that is continuous with the drain hole is formed in a component part of the internal combustion engine located below the drain hole. The separated oil is discharged through the drain hole and the communication hole.

That is, in the oil discharge structure of the present invention, a communication hole connected to the drain hole is further provided in a component part of the internal combustion engine located below the drain hole of the oil mist separator. For this reason, it is possible to make the length of the drain hole and the communication hole longer than the length capable of securing the oil head. The communication hole is formed in a component part of the internal combustion engine which is a part different from the oil mist separator. For this reason, it is not necessary to set the length of the drain hole on the oil mist separator side to a length corresponding to the oil head as in the prior art, and a simple configuration can be achieved.
In addition, since the length of the drain hole in the oil discharge part on the oil mist separator side can be freely set regardless of the oil head, the oil discharge part can be structured not to protrude excessively downward. It becomes easy to handle itself.
As described above, the oil discharge structure of the present invention is easy to handle and can secure a sufficient oil head while having a simple configuration.

Moreover, since the components of the internal combustion engine is a cam cap for holding the cam shaft, it is possible to easily form the communication hole.

  Furthermore, when the drain hole and the communication hole communicate with each other via a gasket, the airtightness and liquid tightness of the joint between the drain hole and the communication hole can be easily ensured.

The present invention will be further described in the following detailed description with reference to the drawings referred to, with reference to non-limiting examples of exemplary embodiments according to the present invention. Similar parts are shown throughout the several figures.
It is a longitudinal cross-sectional view which shows the outline of the internal combustion engine for vehicles by which the oil mist separator provided with the oil discharge structure which concerns on an Example is mounted. It is the II sectional view taken on the line of FIG. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is a principal part expanded sectional view of the oil discharge structure which concerns on an Example. It is explanatory drawing for demonstrating the oil discharge structure which concerns on other embodiment. It is explanatory drawing for demonstrating the oil discharge structure which concerns on other embodiment. It is explanatory drawing for demonstrating the oil discharge structure which concerns on other embodiment. It is explanatory drawing for demonstrating the oil discharge structure which concerns on other embodiment. It is explanatory drawing for demonstrating the oil discharge structure which concerns on other embodiment. It is explanatory drawing for demonstrating the oil discharge structure which concerns on other embodiment. It is explanatory drawing for demonstrating the oil discharge structure which concerns on other embodiment.

  The items shown here are exemplary and illustrative of the embodiments of the present invention, and are the most effective and easy-to-understand explanations of the principles and conceptual features of the present invention. It is stated for the purpose of providing what seems to be. In this respect, it is not intended to illustrate the structural details of the present invention beyond what is necessary for a fundamental understanding of the present invention. It will be clear to those skilled in the art how it is actually implemented.

  The oil discharge structure (1) according to the present embodiment is included in the blow-by gas by circulating the blow-by gas that is mounted on the cylinder head cover (5) of the internal combustion engine (3) and leaks into the crankcase (35). It is an oil discharge structure of an oil mist separator (7) that separates mist-like oil (see, for example, FIGS. 1 to 3, FIG. 12, etc.).

The oil mist separator includes a separator body (37), a gas introduction part (39), a gas discharge part (41), a separation means (43), and an oil discharge part (45) described below.
The “separator body” is not particularly limited in its configuration, shape, material and the like as long as the gas flow passage (51) is formed. The separator main body is usually provided in a cylindrical shape, and the gas flow passage is a space inside the cylindrical separator main body. A separator main body can be provided with wall parts, such as a bottom wall (47), a ceiling wall (49), a side wall, for example. These wall portions can be, for example, part of the wall portion of the cylinder head cover. The separator body may include a separator body provided separately from the cylinder head cover. In this case, the separator body may be disposed outside the cylinder head cover (see, for example, FIG. 12) or may be disposed inside.

As long as the above-mentioned “gas introduction part” introduces blow-by gas into the separator body, its shape, arrangement form, etc. are not particularly limited. The arrangement position of the gas introduction part is not particularly limited, but it is preferably provided on the bottom wall of the separator body. This is because the separated oil accumulates on the bottom wall of the separator body, and can be recirculated to the oil reservoir of the internal combustion engine by allowing the oil to flow out of the gas inlet.
As long as the above-mentioned “gas discharge part” discharges blow-by gas from the separator body, its shape, arrangement form, etc. are not particularly limited. Although the arrangement position of this gas discharge part is not ask | required in particular, For example, it can be provided away from the bottom wall of the separator main body upward. Thereby, it can suppress that the oil which reached | attained the downstream of the gas flow path through the bottom wall will be discharged | emitted from a gas discharge part. In the PCV system, the blow-by gas discharged from the gas discharge unit is usually introduced into the intake system of the internal combustion engine and sent to the combustion chamber again.

  The “separation means” is provided in the separator main body, and its configuration, shape, material, etc. are not particularly limited as long as oil is separated from blow-by gas. The separation means can be provided between the gas introduction part and the gas discharge part, for example. As a form of the separation means, for example, (i) a form provided with a plurality of baffle plates (57) provided so that the flow of blow-by gas meanders, or (ii) a gas flow passage so as to block the flow of blow-by gas A rectifying plate (59) provided inside, and a collision plate (61) provided on the downstream side of the rectifying plate so as to oppose the rectifying plate, wherein the rectifying plate has a through hole, The blow-by gas may be in a form that passes through the through-hole and collides with the collision plate (see, for example, FIG. 3). The separation means may be in the form of separating using a centrifugal force, a filter, or the like. These separation means may be used alone in one form, or different forms of separation means may be provided in parallel or combined with the flow of blow-by gas.

The “oil discharge part” has a drain hole (63) formed in the bottom wall of the separator main body, and as long as the oil separated by the separating means is discharged from the separator main body, its configuration, shape and size. The material is not particularly limited. The shape and size of the “drain hole” are not particularly limited.
In the oil discharge structure according to the present embodiment, communication holes (65, 69, 71) connected to the drain hole are formed in the components of the internal combustion engine located below the drain hole. The separated oil is discharged through the drain hole and the communication hole.

The shape, size, etc. of the drain hole and the communication hole are not particularly limited. The drain hole and the communication hole have such a size that the separated oil can stay at a certain height in the hole so as to close the hole so as to balance the pressure difference between the inside and the outside of the gas flow passage. And a hole having a shape.
Examples of the “components of the internal combustion engine” include a cam cap (13), a cam carrier (15), a cylinder head (17), a cylinder head cover (5), and the like. The communication hole is formed in one of the components of the internal combustion engine (see, for example, FIGS. 3 to 5) or in two or more (see, for example, FIGS. 8, 9). Can do.

  In the oil discharge structure according to the present embodiment, for example, the drain hole and the communication hole can communicate with each other via a gasket (67) (see, for example, FIG. 5). That is, in the oil discharge structure according to the present embodiment, for example, a gasket is interposed between the bottom wall of the separator body in which the drain hole is formed and the internal combustion engine component in which the communication hole is formed. it can.

  Hereinafter, the present invention will be specifically described with reference to the drawings. In this embodiment, an oil discharge structure of an oil mist separator provided in a vehicle internal combustion engine is illustrated.

(1) Configuration of Internal Combustion Engine for Vehicle An oil discharge structure 1 according to this embodiment is provided in a cylinder head cover 5 of an internal combustion engine 3 for a vehicle (hereinafter also simply referred to as an internal combustion engine 3) as shown in FIGS. This is an oil discharge structure of the mounted oil mist separator 7. The internal combustion engine 3 is a so-called DOHC (double over head cam) engine having two camshafts 9 above a piston 11. The camshaft 9 is rotatably held by a cam cap 13 and a cam carrier 15. The lower end side of the cam carrier 15 is fixed to the cylinder head 17. The cylinder head 17 is formed with a combustion chamber 19 above the piston 11, and an intake port 21 and an exhaust port 23 communicating with the combustion chamber 19. There is provided a valve 25 driven by

  The piston 11 is provided so as to reciprocate within a cylinder 29 formed in the cylinder block 27. The piston 11 is connected to the crankshaft 33 via the connecting rod 31. Thereby, the reciprocating motion of the piston 11 is converted into the rotating motion of the crankshaft 33, or the rotating motion of the crankshaft 33 is converted into the reciprocating motion of the piston 11. The crankshaft 33 is disposed in a crankcase 35 provided below the cylinder block 27.

(2) Configuration of Oil Drainage Structure The oil drainage structure 1 according to this embodiment is an oil drainage structure of an oil mist separator 7 mounted on the cylinder head cover 5 of the internal combustion engine 3. The oil mist separator 7 circulates the blow-by gas that leaks from the combustion chamber 19 of the internal combustion engine 3 into the crankcase 35 through the gap between the piston 11 and the cylinder 29. Thereby, the oil mist separator 7 isolate | separates the mist-like oil contained in blow-by gas. In this embodiment, the oil mist separator 7 is provided using the space above one camshaft 9 in the cylinder head cover 5 as shown in FIG.

As shown in FIGS. 3 to 5, the oil mist separator 7 includes a separator main body 37, a gas introduction part 39, a gas discharge part 41, a separation means 43, and an oil discharge part 45.
The separator body 37 has a bottom wall 47. The ceiling wall 49 and both side walls of the separator body 37 are constituted by wall portions of the cylinder head cover 5 of the internal combustion engine 3. Thus, the separator body 37 is formed in a cylindrical shape having a substantially trapezoidal cross section. A space inside the separator body 37 is a gas flow passage 51 through which blow-by gas flows.

The gas introduction part 39 is provided on the bottom wall 47 on one end side of the separator main body 37. The gas introduction part 39 communicates with the space in the crankcase 35 of the internal combustion engine 3, and introduces blow-by gas that has leaked into the crankcase 35 into the separator body 37.
The gas discharge part 41 is provided on the side wall on the end part side opposite to the end part side on which the gas introduction part 39 is provided, and the blow-by gas that circulates in the separator body 37 and passes through the separation means 43 is provided. Discharge outside. The gas discharge unit 41 communicates with the intake system of the internal combustion engine 3, and blow-by gas in the separator body 37 is sucked and discharged as the intake air of the internal combustion engine 3 is sucked. The blow-by gas discharged from the gas discharge portion 41 is again introduced into the combustion chamber 19 through the intake port 21 of the internal combustion engine 3.

  The separating means 43 is provided in the separator main body 37 between the gas introduction part 39 and the gas discharge part 41. As shown in FIG. 3, in this embodiment, the separation means 43 includes a first separation part 53 located upstream of the gas flow passage 51 and a second separation part 55 located downstream thereof in series. The form is provided. The first separation portion 53 is provided with a plurality of baffle plates 57. The baffle plates 57 are provided so as to alternately extend from the bottom wall 47 and the ceiling wall 49 of the separator body 37 along the gas flow passage 51. The blow-by gas meanders and circulates through these baffle plates 57 so that the oil is separated by the action of inertial force.

  The second separation unit 55 includes a rectifying plate 59 and a collision plate 61. The rectifying plate 59 is provided in the gas flow passage 51 so as to stand from the bottom wall 47 of the separator body 37 and block the flow of blow-by gas, and a plurality of holes are formed in the wall surface. The collision plate 61 is provided on the downstream side of the rectifying plate 59 so as to face the rectifying plate 59. The blow-by gas collides with the collision plate 61 in a state where the flow velocity is increased by passing through a hole formed in the rectifying plate 59, and the oil is separated by the action of inertia force at this time.

The oil discharge unit 45 discharges the oil separated by the separation unit 43 from the separator body 37. The oil discharge part 45 has a drain hole 63 formed in the bottom wall 47 of the separator body 37.
In the oil discharge structure 1 according to the present embodiment, the communication hole connected to the drain hole 63 is formed in the cam cap 13 (illustrated as a component part of the internal combustion engine according to the present invention) located below the drain hole 63 of the oil mist separator 7. 65 is formed. Thereby, the oil separated by the oil mist separator 7 is discharged through the drain hole 63 and the communication hole 65. As shown in FIG. 2, the communication hole 65 is formed at the approximate center in the width direction of the cam cap 13.

  In the present embodiment, the drain hole 63 and the communication hole 65 are straight holes having a substantially circular cross section and a substantially equal diameter. Further, as shown in FIG. 5, the drain hole 63 and the communication hole 65 communicate with each other through a gasket 67. In the drain hole 63 and the communication hole 65, the separated oil stays at a certain height or higher so as to block the hole. The lower end of the communication hole 65 is open to the space in the cylinder head cover 5. This space communicates with the space in the crankcase 35 through a communication passage (not shown), and the separated oil is discharged together with oil that lubricates the camshaft 9 and the valve 25 after being discharged into this space. The oil pan is returned to the oil pan below the crankcase 35 through the communication path.

(3) Action of Oil Drainage Structure Next, the action of the oil drainage structure 1 configured as described above will be described. The blow-by gas leaking into the crankcase 35 is introduced into the oil mist separator 7 to separate the oil. Specifically, the blow-by gas is first introduced into the separator body 37 from the gas introduction part 39. The introduced blow-by gas flows through the gas flow passage 51 while being meandered by the baffle plate 57 as shown in FIG. At this time, among the mist-like oil contained in the blow-by gas, oil of relatively large particles is inertially separated. Further, the blow-by gas passes through a hole formed in the rectifying plate 59 to increase the flow velocity, and collides with the collision plate 61 in this state. At this time, the oil mist inertially collides with the collision plate 61 and adheres to the surface thereof. This separates the oil from the blowby gas. The oil adhering to the surface of the collision plate 61 is gradually aggregated and falls below the collision plate 61. The oil thus separated reaches the oil discharge portion 45 along the surface of the bottom wall 47 of the separator body 37 and is discharged to the outside.

The discharged oil stays in the drain hole 63 and the communication hole 65 so as to close the hole at a constant oil level, and an oil head is secured. By securing the oil head in this manner, the balance between the pressure difference between the space in the separator body 37 and the external space is maintained, and backflow of blow-by gas from the oil discharge part 45 into the separator body 37 is prevented. Is done. In addition, when oil accumulates more than fixed oil level height, the oil for that amount is discharged | emitted from the lower end of the communicating hole 65. FIG.
The hole length for securing the oil head is ensured by connecting the communication hole 65 below the drain hole 63. For this reason, the hole length more than fixed oil level height is ensured, without making the oil discharge part 45 of the oil mist separator 7 protrude below by the length according to the oil head.
In addition, the oil discharge part 45 of the oil mist separator 7 does not need to protrude downward with a length corresponding to the oil head, and takes into account the final dimensions when it is transported and stored as a part, ease of assembly, etc. Can be set freely and can be handled easily.

(4) Effects of the Embodiment As described above, according to the oil discharge structure 1 of the present embodiment, the oil mist separator 7 includes the separator body 37 in which the gas flow passage 51 through which the blowby gas flows is formed, and the blowby gas as the separator body. A gas introduction part 39 for introducing the gas into the gas generator 37; a gas discharge part 41 for discharging the blow-by gas from the separator main body 37; a separating means 43 provided in the separator main body 37 for separating the oil from the blow-by gas; An oil discharge portion 45 that has a drain hole 63 formed in the wall 47 and discharges the oil separated by the separation means 43 from the separator main body 37 is provided. The cam cap 13 located below the drain hole 63 is formed with a communication hole 65 that is continuous with the drain hole 63. The separated oil is discharged through the drain hole 63 and the communication hole 65.

  That is, in the oil discharge structure 1 of the present embodiment, the communication hole 65 connected to the drain hole 63 is further provided in the cam cap 13 which is a component part of the internal combustion engine 3 positioned below the drain hole 63 of the oil mist separator 7. ing. For this reason, the drain hole 63 and the communication hole 65 can be made to have a hole length that is longer than the length capable of securing the oil head. Since the communication hole 65 is formed in a component part of the internal combustion engine 3 which is a part different from the oil mist separator 7, the length of the drain hole 63 on the oil mist separator 7 side as in the prior art. It is not necessary to set the length according to the oil head, and a simple configuration can be obtained.

Further, since the length of the drain hole 63 in the oil discharge part 45 on the oil mist separator 7 side can be freely set regardless of the oil head, the oil mist separator 7 has a structure in which the oil discharge part 45 does not protrude downward. Therefore, handling of the oil mist separator 7 itself becomes easy.
As described above, the oil discharge structure 1 of the present embodiment is easy to handle and can secure a sufficient oil head while having a simple configuration.

  In the present embodiment, since the constituent part of the internal combustion engine 3 is a cam cap that holds the camshaft, the communication hole can be easily formed.

  Furthermore, in the present embodiment, the drain hole 63 and the communication hole 65 communicate with each other via the gasket 67, so that the airtightness and liquid tightness of the joint between the drain hole 63 and the communication hole 65 can be easily secured. Can do.

  In the present invention, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. That is, in the above-described embodiment, the communication hole 65 is formed at the approximate center in the width direction of the cam cap 13, but the present invention is not limited to this. For example, as shown in FIGS. You may make it form in the offset position.

  In the above embodiment, the communication hole 65 is formed in the cam cap 13, but the present invention is not limited to this. For example, as shown in FIG. 8, the cam carrier 15 positioned further below the cam cap 13. Also, a communication hole 69 is formed so that the separated oil is discharged through the drain hole 63, the communication hole 65 connected to the drain hole 63, and the communication hole 69 connected to the communication hole 65. Good. Further, as shown in FIG. 9, a communication hole 71 connected to the communication hole 69 is further formed in the cylinder head 17 positioned below the cam carrier 15, and the separated oil is supplied to the drain hole 63 and the communication holes 65 to 71. May be discharged through. Furthermore, in this case, the lower end of the communication hole 71 may reach the oil pan below the crankcase 35.

Further, in the above-described embodiment, the drain hole 63 and the communication hole 65 are straight holes. However, the present invention is not limited to this. For example, as shown in FIG. A stepped hole such as the hole 65 may be used, or as shown in FIG. 11, a tapered drain hole 63 and a communication hole having a diameter increasing upward may be used. Furthermore, it is good also as a hole which combined these level | step difference shape and taper shape.
Moreover, in the said Example, although the drain hole 63 and the communicating hole 65 were holes with a cross-sectional shape substantially circular shape, it is not limited to this, For example, a cross-sectional shape is a substantially polygon, a substantially oval shape, a substantially oval shape, etc. It may be a hole.

  Furthermore, although the oil mist separator provided using the space above the camshaft 9 in the cylinder head cover 5 is exemplified as the oil mist separator in the above embodiment, the present invention is not limited to this. For example, FIG. As shown, an oil mist separator 7 provided outside the cylinder head cover 5 may be used. In FIG. 12, the oil mist separator 7 is configured such that a separator body 37 formed separately from the cylinder head cover 3 is disposed on the outer upper portion of the cylinder head cover 3.

  The foregoing examples are for illustrative purposes only and are not to be construed as limiting the invention. Although the invention has been described with reference to exemplary embodiments, it is to be understood that the language used in the description and illustration of the invention is illustrative and exemplary rather than limiting. As detailed herein, changes may be made in its form within the scope of the appended claims without departing from the scope or spirit of the invention. Although specific structures, materials, and examples have been referred to in the detailed description of the invention herein, it is not intended to limit the invention to the disclosure herein, but rather, the invention is claimed. It covers all functionally equivalent structures, methods and uses within the scope of

  The present invention is not limited to the embodiments described in detail above, and various modifications or changes can be made within the scope of the claims of the present invention.

  DESCRIPTION OF SYMBOLS 1; Oil discharge structure, 3; Internal combustion engine for vehicles, 5: Cylinder head cover, 7: Oil mist separator, 9; Cam shaft, 11; Piston, 13; Cam cap, 15: Cam carrier, 17; Combustion chamber, 21; Intake port, 23; Exhaust port, 25; Valve, 27; Cylinder block, 29; Cylinder, 31; Connecting rod, 33; Crankshaft, 35; Crankcase, 37; Part 41; gas discharge part 43; separation means 45; oil discharge part 47; bottom wall 49; ceiling wall 51; gas flow passage 53; first separation part 55; second separation part 57 Baffle plate, 59; current plate, 61; collision plate, 63; drain hole, 65, 69, 71; communication hole, 67;

Claims (3)

An oil discharge structure of an oil mist separator that is mounted on a cylinder head cover of an internal combustion engine and separates mist-like oil contained in the blowby gas by circulating a blowby gas leaking into the crankcase,
The oil mist separator is
A separator body formed with a gas flow passage through which the blow-by gas flows;
A gas introduction part for introducing the blow-by gas into the separator body;
A gas discharge part for discharging the blow-by gas from the separator body;
A separating means provided in the separator body for separating the oil from the blow-by gas;
An oil discharge part that has a drain hole formed in the bottom wall of the separator body and discharges the oil separated by the separation means from the separator body;
A component hole of the internal combustion engine located below the drain hole is formed with a communication hole that is continuous with the drain hole.
The component of the internal combustion engine is a cam cap that holds the pair of camshafts across a pair of camshafts arranged side by side,
On the upper surface between the pair of cam shafts of the cam cap, a protruding portion is formed that protrudes toward the bottom wall of the separator body and is formed with the communication hole.
The oil discharge structure, wherein the separated oil is discharged through the drain hole and the communication hole.   The oil drainage structure according to claim 1, wherein the drain hole and the communication hole communicate with each other through a gasket. The oil discharge structure according to claim 1 or 2, wherein a lower end of the communication hole is opened to a space in the cylinder head cover.

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